Sharp R 2397 User Manual

R-2397  
SERVICE MANUAL  
S5708R2397H/X  
COMMERCIAL  
MICROWAVE OVEN  
MODEL  
R-2397  
In interests of user-safety the oven should be restored to its original  
condition and only parts identical to those specified should be used.  
TABLE OF CONTENTS  
Page  
CAUTION, MICROWAVE RADIATION ...................................................................................................... 1  
WARNING ................................................................................................................................................... 1  
PRODUCT SPECIFICATIONS................................................................................................................... 2  
GENERAL IMPORTANT INFORMATION ................................................................................................... 2  
APPEARANCE VIEW................................................................................................................................. 3  
OPERATION SEQUENCE ......................................................................................................................... 4  
FUNCTION OF IMPORTANT COMPONENTS .......................................................................................... 5  
SERVICING ............................................................................................................................................... 7  
TEST PROCEDURE ................................................................................................................................ 10  
TOUCH CONTROL PANEL ASSEMBLY .................................................................................................. 17  
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 24  
MICROWAVE MEASUREMENT .............................................................................................................. 29  
WIRING DIAGRAM .................................................................................................................................. 30  
PICTORIAL DIAGRAM............................................................................................................................. 31  
CONTROL PANEL CIRCUIT .................................................................................................................... 32  
PRINTED WIRING BOARD ...................................................................................................................... 33  
PARTS LIST............................................................................................................................................. 34  
SHARP CORPORATION  
R-2397  
SERVICE MANUAL  
PRODUCT SPECIFICATIONS  
COMMERCIAL  
R-2397  
GENERAL INFORMATION  
APPEARANCE VIEW  
GENERAL IMPORTANT INFORMATION  
ThisManualhasbeenpreparedtoprovideSharpCorp.Service  
engineers with Operation and Service Information.  
It is recommended that service engineers carefully study the  
entire text of this manual, so they will be qualified to render  
satisfactory customer service.  
OPERATING SEQUENCE  
CAUTION  
MICROWAVE RADIATION  
FUNCTION OF IMPORTANT  
COMPONENTS  
DO NOT BECOME EXPOSED TO RADIATION FROM  
THE MICROWAVE GENERATOR OR OTHER PARTS  
CONDUCTING MICROWAVE ENERGY.  
SERVICING AND  
TROUBLESHOOTING CHART  
Service engineers should not be exposed to the microwave  
energy which may radiate from the magnetron or other  
microwave generating devices if it is improperly used or  
connected. All input and output microwave connections,  
waveguides, flanges and gaskets must be secured. Never  
operate the device without a microwave energy absorbing  
load attached. Never look into an open waveguide or  
antenna while the device is energized.  
TEST PROCEDURE  
TOUCH CONTROL PANEL  
ASSEMBLY  
WARNING  
COMPONENT  
REPLACEMENT AND  
ADJUSTMENT PROCEDURE  
Never operate the oven until the following points are ensured.  
(A) The door is tightly closed.  
(B) The door brackets and hinges are not defective.  
(C) The door packing is not damaged.  
(D) The door is not deformed or warped.  
(E) There is not any other visible damage with the oven.  
MICROWAVE MEASUREMENT  
WIRING DIAGRAM  
Servicing and repair work must be carried out only by trained  
service engineers.  
All the parts marked "*" on parts list are used at voltages more  
than 250V.  
Removal of the outer wrap gives access to potentials above  
250V.  
PARTS LIST  
All the parts marked "" on parts list may cause undue  
microwave exposure, by themselves, or when they are dam-  
aged, loosened or removed.  
SHARP CORPORATION  
OSAKA, JAPAN  
1
R-2397  
PRODUCT DESCRIPTION  
SPECIFICATION  
ITEM  
DESCRIPTION  
Power Requirements  
230 Volts  
50 Hertz  
Single phase, 3 wire grounded  
2.7 kW Approx. 13A  
Power Consumption  
Power Output  
1700 watts nominal of RF microwave energy (Method of IEC 705)  
Operating frequency of 2450MHz  
Outside Dimensions  
Width 510mm  
Height 335 mm  
Depth 470 mm  
Cooking Cavity Dimensions  
Control Complement  
Width 330 mm  
Height 180 mm  
Depth 330 mm  
Touch Control System  
The combination of cooking time and microwave power  
The oven can be programmed a series of up to 3 cookling stages.  
The combination of microwave power and cooking time that can be input as  
folllows.  
Cooking  
Sequence  
Micrwave power level  
that can be used.  
Cooking time that can be iused.  
Max. 30 minutes  
1 Stage only  
0-100%  
0-40% all stages  
Max. 30 minutes any stages  
Max. 60 minutes for 2 stages  
Max. 90 minutes for 3 stages  
Max. 30 minutes for 3 stages  
2 or 3 Stage  
50-100%  
NOTE: If the oven used with the power level above 40% on any stage, the  
maximum cooking time is 30 minutes in total.  
Microwave Power level  
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%  
MANUAL / REPEAT key, NUMBER keys  
MICROWAVE POWER SETTING key  
STOP / CLEAR key, START Key  
DOUBLE QUANTITY key, DEFROST key  
SET key, CHECK key, VOLUME key  
Set Weight  
Approx. 33kg  
GENERAL INFORMATION  
WARNING  
THIS APPLIANCE MUST BE EARTHED  
IMPORTANT  
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:  
GREEN-AND-YELLOW  
BLUE  
BROWN  
: EARTH  
: NEUTRAL  
: LIVE  
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APPEARANCE VIEW  
OVEN  
11  
10  
5
4
3
2
19  
1. Control panel  
14  
18  
2. Hole for safety door latches  
3. Ceramic floor  
1
13  
4. Splash cover  
15  
16  
5. Oven light  
8
6. Air intake filter  
7. Air intake openings  
8. Oven cavity  
12  
9
6
17  
7
9. Door seals and sealing surfaces  
10. Door hinges  
11. Oven door with see-through window  
12. Door safety latches  
AUTO TOUCH CONTROL PANEL  
13. Door handle.  
3
4
14. Outer cabinet  
6
DISPLAY AND INDICATORS  
15. Removable cover over oven light bulb  
16. Air vent openings  
DEF CHECK  
NUMBER  
Check indicators after the oven starts to  
confirm the oven is operating as desired.  
1. Heating indicator  
POWER  
2
1
5
7
8
9
%
1
2
3
ON  
DOUBLE FILTER  
17. Power supply cord  
11  
18 Mounting plate  
This indicator shows cooking in progress.  
2. Memory number indicator  
3. Defrost indicator  
10  
19 Screw for mounting plate  
13  
12  
x
2
4. Check mode indicator  
5. Power level display  
11  
12  
1
2
3
4
5
6
7
8
9
0
6. Time display  
7. Filter indicator  
8. Double quantity mode indicator  
9. 3rd. stage indicator  
13  
14  
15  
10. 2nd. stage indicator  
14  
11. 1st. stage indicator  
OPERATING KEYS  
12. DOUBLE QUANTITY key  
13. DEFROST key  
16  
17  
18  
19  
20  
14. NUMBER keys  
15. MANUAL/ REPEAT key  
16. STOP/CLEAR key  
17. MICROWAVE POWER SETTING key  
18. START key  
15  
17  
16  
18  
19. SET key  
20. VOLUME key  
21. CHECK key  
19  
20  
21  
INSTALLATION INFORMATION  
When this commercial microwave oven is installed near other commercial electrical appliances, connect a lead wire  
to each equivalent potential terminal with equipotential marking between them (insert a lead wire between a washer and  
an earth angle, and screw them), as shown in Fig. A-1, to make sure that they are at equivalent potential.  
If any lead wire is not connected between them, when person touch them he/she will get a electric shock.  
Equipotential marking  
COMMERCIAL MICROWAVE OVEN  
OTHER COMMERCIAL  
ELECTRICAL APPLIANCE  
Lead wire  
Screw  
Washer  
Equivalent  
potential terminal  
Earth angle  
(Equivalent potential terminal)  
Lead wire  
Figure A-1  
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OPERATION SEQUENCE  
OFF CONDITION  
the relay RY1 stays closed. Shown in the display is the  
remaining time, but the program is cancelled if the oven  
is not started within 3 minutes.  
Closing the door activates all door interlock switches  
(1st latch switch, 2nd latch switch, 3rd latch switch and stop  
switch)  
6. MONITOR SWITCH CIRCUIT  
The monitor switch is mechanically controlled by oven  
door, and monitors the operation of the 1st latch switch.  
6-1. When the oven door is opened during or after the cycle  
of a cooking program, the 1st, 2nd, 3rd latch and stop  
switches must open their contacts first. After that the  
contacts (COM-NC) of the monitor switch can be  
closed.  
6-2. When the oven door is closed, the contacts (COM-NC)  
of the monitor switch must be opened first. After that  
the contacts (COM-NO) of the 1st, 2nd, 3rd latch and  
stop switches must be closed.  
IMPORTANT  
When the oven door is closed, the monitor switch contacts  
COM-NC must be open. When the microwave oven is  
plugged in a wall outlet (230 volts, 50Hz), the line voltage is  
supplied to the point A5+A7 in the control panel.  
Figure O-1 on page 30  
1. The digital display shows  
.
NOTE: When the door is opened or after cooking, oven  
lamp, blower motor and stirrer motors work for 1  
minute.  
6-3. When the oven door is opened and the contacts of the  
1st latch switch remain closed, remains closed, the  
fuse F6.3A will blow, because the monitor switch is  
closed and a short circuit is caused.  
MICROWAVE COOKING CONDITION  
Touch MANUAL/ REPEAT key and enter a desired cooking  
timewiththetouchingNUMBERkey.AndthentouchSTART  
key.  
MICROWAVE VARIABLE COOKING  
When the microwave oven is preset for variable cooking  
power, the line voltage is supplied to the high voltage  
transformers intermittently within a 48 second time base  
through the contacts of the relays RY3+RY4.  
Function sequence Figure O-2 on page 30  
CONNECTED COMPONENTS  
Oven lamp/ Blower motor/ Stirrer motors  
Power transformer (rear)  
RELAY  
RY1  
The following levels of microwaves power are given.  
RY3  
Power transformer (front)  
RY4  
48 sec. ON  
Number key  
44sec. ON  
1. The line voltage is supplied to the primary winding of the  
high voltage transformer. The voltage is converted to  
about 3.3 volts A.C. output on the filament winding and  
high voltage of approximately 2000 volts A.C. on the  
secondary winding.  
2. The filament winding voltage (3.3 volts) heats the  
magnetron filament and the high voltage (2000 volts) is  
sent to the voltage doubling circuit, where it is doubled  
to negative voltage of approximately 4000 volts D.C..  
3. The 2450 MHz microwave energy produced in the  
magnetron generates a wave length of 12.24 cm. This  
energy is channelled through the waveguide (transport  
channel) into the oven cavity, where the food is placed  
to be cooked.  
Number key 9  
40 sec. ON  
Number key 8  
36 sec. ON  
Number key 7  
32 sec. ON  
Number key 6  
26 sec. ON  
Number key 5  
22 sec. ON  
Number key 4  
16 sec. ON  
4. When the cooking time is up, a signal tone is heard and  
the relays RY3+RY4 go back to their home position. The  
circuits to the high voltage transformers. The relay RY1  
remains and oven lamp, blower motor and stirrer motors  
work for 1 minute.  
Number key 3  
12 sec. ON  
Number key 2  
8 sec. ON  
Number key 1  
0 sec. ON  
5. When the door is opened during a cook cycle, the  
switches come to the following condition.  
Number key 0  
CONDITION  
DURING  
COOKING  
Closed  
Open  
DOOR OPEN  
(NO COOKING)  
SWITCH  
CONTACT  
COM-NO  
COM-NC  
COM-NO  
COM-NO  
COM-NO  
NOTE: The ON/OFF time ratio does not exactly corre-  
spond to the percentage of microwave power, be-  
cause approx. 3 seconds are needed for heating up  
the magnetron filament.  
1st latch switch  
Monitor switch  
2nd latch switch  
Stop switch  
Open  
Closed  
Open  
Open  
Open  
Closed  
Closed  
Closed  
3rd latch switch  
TWO MAGNETRON OPERATION SYSTEM  
Two magnetrons MG1+MG2 are equipped in order to get  
highermicrowavepoweroutput. Theprimarywindingsofthe  
highvoltagetransformersT1+T2areconnectedsothateach  
magnetron can be oscillated alternatively according to the  
frequency of the power supply. Refer to the Figure 1 and 2.  
The circuits to the high voltage transformers are cut off  
whenthe1stlatch, 2ndlatch, 3rdlatchandstopswitches  
are made open. The blower motor, stirrer motors and  
oven lamp remains on even if the oven door is opened  
after the cooking cycle has been interrupted, because  
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R-2397  
T2: HIGH VOLTAGE  
TRANSFORMER  
T1: HIGH VOLTAGE  
TRANSFORMER  
(FRONT)  
(REAR)  
COMMERCIAL  
FREQUENCY  
(50HZ)  
POWER OUTPUT  
BY MAGNETRON 1  
OPERATION OF  
MAGNETRON  
H. V. RECTIFIER  
H. V. RECTIFIER  
POWER OUTPUT  
BY MAGNETRON 2  
MG2: MAGNETRON (LOWER)  
MG1: MAGNETRON (UPPER)  
Figure B-1. High Voltage Circuit  
Figure B-2. Operation of Magnetron  
FUNCTION OF IMPORTANT COMPONENTS  
MONITOR SWITCH  
DOOR OPEN MECHANISM  
The monitor switch is activated (the contacts opened) the  
upper latch head and switch lever A while the door is  
closed.Theswitchisintendedtorendertheoveninopera-  
tive by means of blowing the fuse F6.3A when the  
contacts of the 1st latch switch fail to open when the door  
is opened.  
1. The door release lever is pulled.  
2. The upper latch head is lifted up by the linked door  
release lever.  
3. The latch lever is lifted up by the door release lever.  
4. The joint lever is lifted up by the latch lever.  
5. The lower latch head is lifted up by the joint lever.  
6. Now both latch heads are lifted up, so they can be  
released from the latch hook.  
Function  
1. When the door is opened, the monitor switch contacts  
close (to the ON condition) due to their being normally  
closed. At this time the 1st latch switch is in the OFF  
condition (contacts open) due to their being normally  
open contact switches.  
7. Now the door can be opened.  
Door release  
Latch head  
lever  
2. As the door goes to a closed position, the monitor  
switch contacts are opened and 1st latch switch con-  
tacts are closed (On opening the door, each of these  
switches operate inversely.)  
3. If the door is opened and the 1st latch switch contacts  
fail to open, the fuse F6.3A blows simultaneously with  
closing of the monitor switch contacts.  
Monitor switch  
Latch hook  
CAUTION:BEFORE REPLACING A BLOWN FUSE  
F6.3A TEST THE 1ST LATCH SWITCH,  
MONITOR SWITCH AND MONITOR RESIS-  
TOR FOR PROPER OPERATION. (REFER  
TO CHAPTER “TEST PROCEDURE”).  
2nd. latch switch  
1st. latch switch  
Joint lever  
Stop switch  
MONITOR RESISTOR  
The monitor resistor prevents the fuse F6.3A 250V burst-  
ing when the fuse F6.3A 250V blows due to the operation  
of the monitor switch.  
Latch head  
3rd. latch switch  
Figure D-1. Door Open Mechanism  
NOISE FILTER  
The noise filter assembly prevents radio frequency inter-  
ference that might flow back in the power circuit.  
1ST LATCH SWITCH, 2ND LATCH SWITCH, 3RD  
LATCH SWITCH AND STOP SWITCH  
1. When the oven door is closed, the contacts COM-NO  
must be closed.  
2. Whentheovendoorisopened, thecontactsCOM-NO  
must be opened.  
WEAK POINT  
Ifthewireharnessorelectricalcomponentsmakeashort-  
circuit, this weak point blows to prevent an electric shock  
or fire hazard.  
5
R-2397  
FUSE F6.3A 250V  
MAGNETRON THERMISTOR  
1. If the wire harness or electrical components are short-  
circuited, this fuse blows to prevent an electric shock  
or fire hazard.  
2. The fuse also blows when 1st latch switch remains  
closed with the oven door open and when the monitor  
switch closes.  
The air temperature around the lower magnetron is  
detected through the resistance of the thermistor.  
If the temperature is high, the control panel will display  
"EE17" and the oven will stop to protect the lower  
magnetron against overheat.  
If the thermistor is open, the control panel will display  
"EE16" and the oven will stop.  
ASYMMETRIC RECTIFIER  
The asymmetric rectifier is solid state device that pre-  
vents current flow is both directions. And it prevents the  
temperature rise of the high voltage transformer by  
blowing the weak point when the high voltage rectifier is  
shorted.  
MAGNETRON THERMAL CUT-OUTS 145˚  
These thermal cut-outs protect the magnetrons against  
overheat. If their temperature go up higher than 145˚C  
because the blower motor is interrupted, the ventilation  
openings are blocked, the thermal cut-outs will open and  
the line voltage to the high voltage transformer will be cut  
off and the operations of the magnetrons will be stopped.  
The defective thermal cut-out must be replaced with new  
rated one.  
B
D2  
D1  
ASYMMETRIC  
RECTIFIER  
HIGH VOLTAGE RECTIFIER  
BLOWER MOTOR THERMAL CUT-OUT 115˚C  
This thermal cut-out protect the blower motor against  
overheat. If its temperature goes up higher than 115˚C  
because the blower motor is locked or the ventilation  
openings are blocked, the contacts of the thermal cut-out  
will open and the line voltage to the control unit will be cut  
off and the operation of the oven will be stopped. The  
defectivethermalcut-outmustbereplacedwithnewrated  
one.  
The rated peak reverse voltage of D1 of the asymmetric  
rectifier is 6 KV The rated peak reverse voltage of D2 of  
the asymmetric rectifier is 1.7 KV. D1 and D2 of the  
asymmetric rectifier or high voltage rectifier are shorted  
when the each peak reverse voltage goes beyond the  
each rated peak reverse voltage.  
1. The high voltage rectifier is shorted by some fault  
when microwave cooking.  
2. The peak reverse voltage of D2 of the rectifier goes  
beyond the rated peak reverse voltage 1.7 KV in the  
voltage doubler circuit.  
OVEN THERMAL CUT-OUT 115˚C  
This thermal cut-out protects the oven against overheat. If  
the temperature goes up higher than 115˚C because the  
food catches fire, the contacts of thermal cut-out will open  
and the line voltage to the control unit will be cut off and the  
operation of the oven will be stopped. The defectivethermal  
cut-out must be replaced with a new rated one.  
3. D2 of the rectifier is shorted.  
4. The large electric currents flow through the high  
voltage winding of the high voltage transformer.  
5. The large electric currents flow through the primary  
winding of the high voltage transformer.  
6. The weak point blows by the large electric currents.  
7. The power supplying to the high voltage transformer  
is cut off.  
BLOWER MOTOR  
The blower motor drives a blade which draws external  
cool air. This cool air is directed through the air vanes  
surrounding the magnetrons and cools the magnetrons.  
This air is channelled through the oven cavity to remove  
steam and vapours given off from the heating foods. It is  
then exhausted through the exhausting air vents at the  
oven cavity.  
EXHAUST THERMISTOR  
Thethermistorisanegativetemperaturecoefficienttype.  
The temperature in the exhaust duct is detected through  
the resistance of the thermistor.  
If the temperature is high, the control panel will display  
“EE7” and the oven will stop to avoid overheating and  
catching fire.  
STIRRER MOTOR  
The stirrer motor drives a stirrer antenna to stir the  
microwave radiation from the waveguide.  
If the thermistor is open, the control panel will display  
"EE6" and the oven will stop.  
INTAKE THERMISTOR  
This thermistor detects ambient air temperature.  
6
R-2397  
SERVICING  
WARNING TO SERVICE PERSONNEL  
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts  
will result in electrocution.  
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.  
REMEMBER TO CHECK 3D  
REMEMBER TO CHECK 4R  
1) Disconnect the supply.  
2) Door opened, and wedged open.  
3) Discharge high voltage capacitor.  
1) Reconnect all leads removed from components  
during testing.  
2) Replace the outer case (cabinet).  
3) Reconnect the supply.  
WARNING AGAINST THE CHARGE OF THE  
HIGH-VOLTAGE CAPACITOR  
4) Run the oven. Check all functions.  
Microwave ovens should not be run empty. To test for  
the presence of microwave energy within a cavity, place  
a cup of cold water on the oven tray, close the door and  
press Manual / Repeat key and set the microwave time  
forone(1)minute.Setthepowerlevelto100%andpush  
the START button. When the one minutes has elapsed  
(timer at zero) carefully check that the water is now hot.  
If the water remains cold carry out 3D checks and re-  
examinetheconnectionstothecomponentbeingtested.  
The high-voltage capacitor remains charged  
about 60 seconds after the oven has been  
switched off. Wait for 60 seconds and then short-  
circuittheconnectionofthehigh-voltagecapacitor  
(thatis, oftheconnectingleadofthehigh-voltage  
rectifier) against the chassis with the use of an  
insulated screwdriver.  
Sharp recommend that wherever possible fault-finding  
is carried out with the supply disconnected. It may in,  
some cases, be necessary to connect the supply after  
the outer case has been removed, in this event carry out  
3D checks and then disconnect the leads to the primary  
of the high voltage transformer. Ensure that these leads  
remain isolated from other components and the oven  
chassis. (Use insulation tape if necessary.) When the  
testing is completed carry out 3D checks and reconnect  
the leads to the primary of the high voltage transformer.  
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked  
and microwave leakage test carried out.  
TROUBLESHOOTING GUIDE  
IMPORTANT: If the oven becomes inoperative because  
of a blown fuse F2 F6.3A in the 1st latch  
switch - monitor switch - monitor resisitor  
circuit, check the 1st latch switch, monitor  
switch and monitor resistor before re-  
placing the fuse F6.3A.  
When troubleshooting the microwave oven, it is helpful to  
followtheSequenceofOperationinperformingthechecks.  
Many of the possible causes of trouble will require that a  
specific test be performed. These tests are given a  
procedure letter which will be found in the “Test  
Procedure”section.  
7
R-2397  
A
A
B
B
C
C
C
D
D
E
E
E
E
E
F
F
G
H
TEST PROCEDURE  
POSSIBLE CAUSE  
AND  
DEFECTIVE PARTS  
PPROBLEM  
CONDITION  
“ . “ does not appear on display when power  
cord is plugged into wall outlet.  
Control panel can not accept key in.  
Fuse F6.3A blows when the door is opened.  
Home fuse blowns when power cord is plugged  
into wall outlet.  
Weak point A017 blowns when power cord is  
plugged into wall outlet.  
Oven lamp, fan motor and stirrer motors do not  
work for 1 minute whenever the door is opened  
or after cooking.  
OFF  
CONDITION  
Fuse F2 F6.3A blowns when power cord is  
plugged into wall outlet.  
Oven lamp does not light when door is opened.  
(Blower and stirrer motors work)  
Blower motor does not work when door is  
opened. (Oven lamp lights and stirrer motors  
work)  
“EE 1” appear in display.  
“EE 2” appear in display.  
“EE 3” appear in display .  
“EE 6” appear in display.  
“EE 7” appear in display.  
“EE 9” appear in display.  
Oven lamp, blower motor and stirrer motors do  
not work.  
Oven lamp does not work.  
Blower motor does not work.  
Oven does not stop after end of cooking cycle or  
whenSTOP/CLEARkeyistouched.(Ovenlamp,  
blower motor and stirrer motors stop.)  
Home fuse blows when starting the oven.  
ON  
CONDITION  
Oven goes into cook cycle but shuts down  
before end of cooking cycle.  
Oven seems to be operating but no heat is  
produced in oven load.  
It passed more than 1 minute after cooking but  
oven lamp, blower motor and stirrer motors do  
not stop.  
“EE 0” appear in display .  
“EE 16” appear in display.  
“EE 17” appear in display.  
“EE 8” appear in display .  
“EE 10” appear in display .  
Stirrer motors do not work.  
8
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O
I
I
I
I
J
L
K
K
K
L
M
N
P
Q
9
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TEST PROCEDURES  
PROCEDURE  
A
COMPONENT TEST  
LETTER  
MAGNETRON TEST  
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL  
WHILE THE OVEN IS IN OPERATION.  
CARRY OUT 3D CHECK.  
Isolatethemagnetronfromhighvoltagecircuitbyremovingallleadsconnectedtofilamentterminal.  
To test for an open circuit filament use an ohmmeter to make a continuity test between the  
magnetron filament terminals, the meter should show a reading of less than 1 ohm.  
To test for short filament to anode condition, connect ohmmeter between one of the filament  
terminals and the case of the magnetron (ground). This test should be indicated an infinite  
resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.  
MICROWAVE OUTPUT POWER (IEC-705-1988)  
The following test procedure should be carried out with the microwave oven in a fully assembled  
condition (outer case fitted). Microwave output power from the magnetron can be measured by way  
of IEC 705, i.e. It is measured by how much power the water load can absorb. To measure the  
microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W)  
heating works for t(second), approximately P x t/4.187 calorie is generated. On the other hand, if  
the temperature of the water with V(ml) rises T (°C) during this microwave heating period, the  
calorie of the water is V x T.  
The formula is as follows;  
P x t / 4.187 = V x T  
P (W) = 4.187 x V x T / t  
Our condition for water load is as follows:  
Room temperature ......... around 20°C Power supply Voltage............... Rated voltage  
Water load ................ 1000 g  
Heating time ............ 25 sec.  
Initial temperature ..............10±2°C  
P=170xT  
Measuring condition:  
1. Container  
The water container must be a cylindrical borosilicate glass vessel having a maximum material  
thickness of 3 mm and an outside diameter of approximately 190 mm.  
2. Temperature of the oven and vessel  
The oven and the empty vessel are at ambient temperature prior to the start the test.  
3. Temperature of the water  
The initial temperature of the water is (10±2)°C.  
4. Select the initial and final water temperature so that the maximum difference between the final  
water temperature and the ambient temperature is 5K.  
5. Select stirring devices and measuring instruments in order to minimize addition or removal of  
heat.  
6. The graduation of the thermometer must be scaled by 0.1°C at minimum and can be accurate  
thermometer.  
7. The water load must be (1000±5) g.  
8. “t” is measured while the microwave generator is operating at full power. Magnetron filament  
heat-up time is not included.  
NOTE: The operation time of the microwave oven is “t + 3” sec. (3 sec. is magnetron filament heat-  
up time.) Therefore total reheating time = 28 seconds.  
Measuring method:  
1. Measure the initial temperature of the water before the water is added to the vessel.  
(Example: The initial temperature T1 = 11°C)  
2. Add the 1 litre water to the vessel.  
3. Place the load on the centre of the shelf.  
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value T of  
(10 ± 2) K.  
5. Stir the water to equalize temperature throughout the vessel.  
6. Measure the final water temperature. (Example: The final temperature T2 = 21°C)  
7. Calculate the microwave power output P in watts from above formula.  
10  
R-2397  
TEST PROCEDURES  
PROCEDURE  
COMPONENT TEST  
LETTER  
Initial temperature............................................................................................... T1 = 11°C  
Temperature after (25 + 3) = 28 sec. ................................................................. T2 = 21°C  
Temperature difference Cold-Warm ................................................................... T = 10°C  
Measured output power  
The equation is “P = 170 x T” .............................................. P = 170 x 10°C = 1700 Watts  
JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.  
CAUTION: 1°C CORRESPONDS TO 170 WATTS. REPEAT MEASUREMENT IF THE POWER IS  
INSUFFICIENT.  
1000g  
1000g  
1000g  
T1˚C  
T2˚C  
Heat up for 28 sec.  
B
HIGH VOLTAGE TRANSFORMER TEST  
WARNING: High voltages and large currents are present at the secondary winding and  
filament winding of high voltage transformer. It is very dangerous to work  
near this part when the oven is on. NEVER make any voltage measurements  
of the high-voltage circuits, including the magnetron filament.  
CARRY OUT 3D CHECKS.  
Disconnecttheleadstotheprimarywindingofthehighvoltagetransformer. Disconnectthefilament  
and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a  
low range, it is possible to check the continuity of all three windings. The following readings should  
be obtained:  
a. Primary winding  
b. Secondary winding  
c. Filament winding  
approx. 1.06 Ω  
approx. 57.3 Ω  
less than 1 Ω  
If the reading obtained are not stated as above, then the high voltage transformer is probably faulty  
and should be replaced.  
CARRY OUT 4R CHECKS.  
C
HIGH VOLTAGE RECTIFIER ASSEMBLY TEST  
HIGH VOLTAGE RECTIFIER TEST  
CARRY OUT 3D CHECKS.  
Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be  
tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C  
of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this  
second reading.  
The normal resistance is infinity in one direction and more than 100 kin the other direction.  
A
B
D2  
D1  
CARRY OUT 4R CHECKS.  
ASYMMETRIC RECTIFIER TEST  
CARRY OUT 3D CHECKS.  
ASYMMETRIC  
RECTIFIER  
HIGH VOLTAGE RECTIFIER  
C
11  
R-2397  
TEST PROCEDURES  
PROCEDURE  
COMPONENT TEST  
LETTER  
IsolatethehighvoltagerectifierassemblyfromtheHVcircuit. Theasymmetricrectifiercanbetested  
using an ohmmeter set to its highest range. Contact the ohmmeter across the terminals A+B of the  
asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second  
reading. If an open circuit is indicated in both directions then the asymmetric rectifier is good. If an  
asymmetric rectifier is shorted in either direction, then the asymmetric rectifier is probably faulty and  
must be replaced with high voltage rectifier. When the asymmetric rectifier is defective, check  
whether magnetron, high voltage rectifier, high voltage wire or filament winding of the high voltage  
transformer is shorted.  
CARRY OUT 4R CHECKS.  
NOTE: FORMEASUREMENTOFTHERESISTANCEOFTHERECTIFIER, THEBATTERIESOF  
THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS,  
BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH  
DIRECTIONS.  
D
HIGH VOLTAGE CAPACITOR TEST  
CARRY OUT 3D CHECKS.  
A. Isolate the high voltage capacitor from the circuit.  
B. Continuity check must be carried out with measuring instrument which is set to the highest  
resistance range.  
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ  
after it has been charged.  
D. A short-circuited capacitor shows continuity all the time.  
E. An open capacitor constantly shows a resistance about 10 Mbecause of its internal 10MΩ  
resistance.  
F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.  
G. The resistance across all the terminals and the chassis must be infinite when the capacitor is  
normal.  
If incorrect reading are obtained, the high voltage capacitor must be replaced.  
CARRY OUT 4R CHECKS.  
E
SWITCH TEST  
CARRY OUT 3D CHECK.  
Isolate the switch to be tested and using an ohmmeter check between the terminals as described  
in the following table.  
Table: Terminal Connection of Switch  
COM; Common terminal  
NO; Normally open terminal  
NC; Normally close terminal  
S.C.; Short circuit  
Plunger Operation  
COM to NO  
O.C.  
COM to NC  
Released  
S.C.  
O.C.  
Depressed  
S.C.  
O.C.; Open circuit  
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.  
CARRY OUT 4R CHECKS.  
F
WEAK POINT A018  
CARRY OUT 3D CHECKS.  
IftheweakpointA018isblown, therecouldbeashortintheasymmetricrectifierorthereisaground  
in wire harness. A short in the asymmetric rectifier may have occured due to short or ground in H.V.  
rectifier, magnetron, high voltage transformer or H.V. wire. Check them and replace the defective  
parts or repair the wire harness.  
CARRY OUT 4R CHECKS.  
CAUTION: Only replace weak point A018 with the correct value replacement.  
12  
R-2397  
TEST PROCEDURES  
PROCEDURE  
G
COMPONENT TEST  
LETTER  
WEAK POINT A017  
CARRY OUT 3D CHECKS.  
IftheweakpointA017isblown,therecouldbeashortsorgroundsinelectricalpartsorwireharness.  
Check them and replace the defective parts or repair the wire harness.  
CARRY OUT 4R CHECKS.  
CAUTION: Only replace weak point A017 with the correct value replacement.  
H
FUSE F6.3A TEST  
CARRY OUT 3D CHECKS.  
If the fuse F6.3A is blown when the door is opened, check the latch switch, monitor switch and  
monitor resistor.  
If the fuse F6.3 is blown by incorrect door switching replace the defective switch(s) and the fuse  
F6.3A.  
CARRY OUT 4R CHECKS.  
CAUTION: Only replace fuse with the correct value replacement.  
I
THERMAL CUT-OUT TEST  
CARRY OUT 3D CHECKS.  
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a  
continuity test across the each two terminals as described in the table below.  
CARRY OUT 4R CHECKS.  
Table: Thermal Cut-out Test  
Temperature of “ON”  
condition (closed circuit).  
(˚C)  
Temperature of “OFF”  
condition (open circuit).  
Indication of ohmmeter  
(When room temperature  
Parts Name  
(˚C) is  
approx. 20˚C.)  
Thermal cut-out 145˚C  
Thermal cut-out 115˚C  
This is not resetable type.  
This is not resetable type.  
Above 145˚C  
Above 115˚C  
Closed circuit.  
Closed circuit  
If incorrect readings are obtained, replace the thermal cut-out.  
An open circuit oven thermal cut-out 115˚C indicates that the oven cavity has over heated, this may  
be due to no load operation.  
An open circuit magnetron thermal cut-out 145˚C indicates that the magnetron has overheated, this  
may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron  
or HV circuit.  
An open circuit blower motor thermal cut-out 115˚C indicates the blower motor winding has  
overheated, this may be due to resisted ventilation or locked cooling fan.  
J
MONITOR RESISTOR TEST  
CARRY OUT 3D CHECKS.  
Disconnect the leads from the monitor resistor. Using an ohmmeter and set on a low range. Check  
between the terminals of the monitor resistor.  
The resistance of monitor resistor should be read approx. 4.3.  
If incorrect readings are obtained, replace the monitor resistor.  
CARRY OUT 4R CHECKS.  
13  
R-2397  
TEST PROCEDURES  
PROCEDURE  
K
COMPONENT TEST  
LETTER  
MAGNETRON THERMISTOR TEST  
CARRY OUT 3D CHECKS.  
Disconnect connector-H from the CPU unit. Measure the resistance of the thermistor with an  
ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.  
Room Temp.  
Resistance  
15˚C ........................ Approx. 15.91 kΩ  
20˚C ........................ Approx. 13.04 kΩ  
25˚C ........................ Approx. 10.74 kΩ  
If the meter does not indicate above resistance, replace the thermistor.  
CARRY OUT 4R CHECKS.  
EXHAUST THERMISTOR TEST  
CARRY OUT 3D CHECKS.  
Disconnect connector-B from the CPU unit. Measure the resistance of the thermistor with an  
ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.  
Room Temp.  
Resistance  
15˚C ........................ Approx. 77.45 kΩ  
20˚C ........................ Approx. 61.47 kΩ  
25˚C ........................ Approx. 49.12 kΩ  
If the meter does not indicate above resistance, replace the thermistor.  
CARRY OUT 4R CHECKS.  
INTAKE THERMISTOR TEST  
CARRY OUT 3D CHECKS.  
Disconnect connector-D from the CPU unit. Measure the resistance of the thermistor with an  
ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.  
Room Temp.  
Resistance  
15˚C ........................ Approx. 15.88 kΩ  
20˚C ........................ Approx. 13.03 kΩ  
25˚C ........................ Approx. 10.74 kΩ  
If the meter does not indicate above resistance, replace the thermistor.  
CARRY OUT 4R CHECKS.  
L
MOTOR WINDING TEST  
CARRY OUT 3D CHECKS.  
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two  
terminals.  
Resistance of Blower motor should be approximately 52.  
Resistance of Stirrer motor should be approximately 8.8 k.  
If incorrect readings are obtained, replace the motor.  
CARRY OUT 4R CHECKS.  
M
NOISE FILTER TEST  
CARRY OUT 3D CHECKS.  
Disconnect the leads from the terminals of noise filter. Using an ohmmeter, check between the  
terminals as described in the following table.  
14  
R-2397  
TEST PROCEDURES  
PROCEDURE  
COMPONENT TEST  
LETTER  
WHT  
N
L
L
L
F1  
L (min)  
0.5mH  
Cx ± 20%  
0.22 µF  
Cy ± 20%  
4700 pF  
Cx  
Cy  
BLK  
MEASURING POINT  
Between N and L  
INDICATION OF OHMMETER  
Open circuit  
Between terminal N and WHITW  
Between terminal L and BLK  
Short circuit  
Short circuit  
If incorrect readings are absorbed, replace the noise filter.  
CARRY OUT 4R CHECKS.  
N
TOUCH CONTROL PANEL ASSEMBLY TEST  
The touch control panel consists of circuits including semiconductors such as LSI, IC, etc.  
Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with  
only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided  
into two units, Control Unit and Switch Unit, troubleshooting by unit replacement is described  
according to the symptoms indicated.  
1. Key Unit  
The following symptoms indicate a defective key unit. Replace the key unit.  
a) When touching the pads, a certain pad produces no signal at all.  
b) When touching the pads, sometimes a pad produces no signal.  
2. Control Unit  
The following symptoms may indicate a defective control unit. Replacing the control unit.  
2-1 Programming problems.  
a) When touching the pads, a certain group of pads do not produce a signal.  
2-2 Display problems.  
a) For a certain digit, all or some segments do not light up.  
b) For a certain digit, brightness is low.  
c) Only one indicator does not light.  
d) The corresponding segments of all digits do not light up; or they continue to light up.  
e) Wrong figure appears.  
f) A certain group of indicators do not light up.  
g) The figure of all digits flicker.  
2-3 Other possible problems caused by defective control unit.  
a) Buzzer does not sound or continues to sound.  
b) Cooking is not possible.  
Note: When defective components, (the Control Unit or Key Unit) are replaed, the defective part  
or parts must be properly packed for return in the shipping carton. with its cushion material,  
in which the new replacement part was shipped to you.  
O
KEY UNIT TEST  
f the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is  
making good contact, verify that the door sensing switch (stop switch ) operates properly; that is the  
contacts are closed when the door is closed and open when the door is open. If the door sensing  
switch (stop switch ) is good, disconnect the flat ribbon cable that connects the key unit to the control  
unit and make sure the door sensing switch is closed (either close the door or short the stop switch  
connector ). Use the key unit matrix indicated on the control panel schematic and place a jumper  
wire between the pins that corre-  
G 1  
G 4  
G 3  
G 2  
G 5  
G 7  
G 8  
G 6  
spond to the STOP/CLEAR pad  
makingmomentarycontact.Ifthe  
control unit responds by clearing  
with a beep, the key unit is faulty  
and must be replaced. If the con-  
trol unit does not respond, it is  
faulty and must be replaced.  
G 9  
7
8
X2  
G 10  
G 11  
G 12  
3
4
1
2
5
6
9
0
15  
R-2397  
TEST PROCEDURES (CONT'D)  
COMPONENT TEST  
PROCEDURE  
LETTER  
If a specific pad does not respond, the above method may be used (after clearing the control unit)  
to determine if the control unit or key pad is at fault.  
P
RELAY TEST  
CARRY OUT 3D CHECKS.  
Remove the outer case and check voltage between Pin Nos. 5 and 7 of the connector (A) on the  
control unit with an A.C. voltmeter. The meter should indicate 230 volts, if not check control unit  
circuity.  
RY1, RY3 and RY4 Relay Test  
These relays are operated by D.C. voltage.  
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.  
DC. voltage indicated ............................ Defective relay.  
DC. voltage not indicated ...................... Check diode which is connected to the relay coil. If  
diode is good, control unit is defective.  
RELAY SYMBOL OPERATIONAL VOLTAGE  
CONNECTED COMPONENTS  
RY1  
RY3  
RY4  
APPROX. 19.0V D.C.  
APPROX. 16.0V D.C.  
APPROX. 18.0V D.C.  
Oven lamp, Blower motor and Stirrer motor  
Power transformer 1  
Power transformer 2  
CARRY OUT 4R CHECKS.  
Q
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING  
BOARD (PWB) IS OPEN  
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary  
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide  
given below for repair.  
Problem: POWER ON, indicator does not light up.  
CARRY OUT 3D CHECKS.  
STEPS  
OCCURANCE  
CAUSE OR CORRECTION  
1
The rated AC voltage is not present at  
POWER terminal of CPU connector (CN-A).  
The rated AC voltage is present at primary  
side of low voltage transformer.  
Check supply voltage and oven power cord.  
2
3
4
Low voltage transformer or secondary circuit defective.  
Check and repair.  
Only pattern at "a" is broken.  
*Insert jumper wire J24 and solder.  
(CARRY OUT 3D CHECKS BEFORE REPAIR)  
*Insert the coil RCILF2003YAZZ between "c" and "d".  
(CARRY OUT 3D CHECKS BEFORE REPAIR)  
Pattern at "a" and "b" are broken.  
D81  
NOTE: *At the time of these repairs, make a  
visual inspection of the varistor for  
burning damage and examine the  
transformerwithtesterforthepresence  
oflayershort-circuit(checkprimarycoil  
resistance). If any abnormal condition  
isdetected,replacethedefectiveparts.  
(J29)  
d
VRS1  
(VRS2)  
a
b
(J23)  
c
3(1)  
5(3)  
9(7)  
(9)  
CARRY OUT 4R CHECKS.  
16  
R-2397  
TOUCH CONTROL PANEL ASSEMBLY  
OUTLINE OF TOUCH CONTROL PANEL  
The touch control section consists of the following units as  
shown in the touch control panel circuit.  
This AC voltage is then half wave rectified by D61/D62  
and smoothed (filtered) by C61/C62.  
This AC voltage is the input to the IN3 and IN5 ports of  
IC1, which determines if there is a magnetron / high  
voltage problem.  
(1) Control Unit  
(2) Key Unit  
Theprincipalfunctionsoftheseunitsandthesignalscommu-  
nicated among them are explained below.  
HIGH VOLTAGE TRANSFORMER  
HIGH VOLTAGE CIRCUIT  
MAIN BODY SIDE  
1. Control Unit  
Signal of key touch and oven function control are all  
processed by one microcomputer.  
T/C SIDE  
1) Power Supply Circuit  
CT1 or CT2  
RY3 or RY4  
This circuit changes output voltage at the secondary side  
of the low voltage (T1) transformer to volatges required  
at each part by full wave rectifying circuit, constant  
voltage circuit, etc..  
R65 or  
R66  
R61 or  
R62  
C61 or C62  
IC1  
IN3 or  
D61 or R63 or D63 or  
D62 R64 D64  
IN5 PORT  
2) ACL Circuit  
This is an Auto-clear Circuit, i.e., a reset circuit, which  
enables IC1 to be activated from initial state.  
Vc  
Figure T-1. High Voltage Monitoring Circuit  
3) Power SYNC Signal Generating Circuit  
This is a circuit for generating power SYNC signal by  
virtue of the secondary side output of transformer T1.  
This signal is used for a basic frequency to time process-  
ing and so on.  
14) Magnetron Temperature Circuit.  
(Detect Noload or Fan Lock)  
Thisisacircuitfortransmittingoutputchangeofthermistor  
(Magnetron Temperature Sensor) to IC1.  
4) Clock Circuit  
15) Intake Air Temperature Detecting Circuit.  
Thisisacircuitfortransmittingoutputchangeofthermistor  
(Intake Air Sensor) to IC1.  
This is a circuit for controlling clock frequency required  
for operating IC1.  
5) IC1 (Main Processor)  
This is a one-chip microcomputer, responsible for con-  
trolling the entire control unit.  
2. Key Unit  
Thekeyunitiscomposedofamatrixcircuitinwhichwhen  
a key it touched, one of signals P11, P12, P15, P16 and  
P17 generated by the LSI, is passed through the key and  
returned to the LSI as one of signals R0--R3. This model  
has20Memorypads. Whentheovenisshipped, Memory  
pad 1 to 10 are set as follows: fig.1.  
6) IC2 (Memory Processor)  
This is a memory IC, responsible for memory function.  
7) Display Circuit  
This is a circuit for driving display tubes by IC1 output.  
8) Key Input Circuit  
This is a circuit for transmitting key input information to  
IC1.  
Memory No.  
Cook Time  
5sec.  
Output Power  
100%  
1
2
10sec.  
100%  
9) Sound-body Driving Circuit  
3
20sec.  
100%  
This is a circuit for driving sound body by IC1 output.  
4
5
6
7
8
9
10  
30sec.  
40sec.  
50sec.  
1min.  
100%  
100%  
100%  
100%  
100%  
100%  
100%  
10) Relay Driving Circuit  
This is a circuit for driving output relay by IC1 output.  
11) Stop Switch Circuit  
This is a circuit for driving IC1 to detect door opening/  
closing.  
1min.15sec.  
1min.30sec.  
2min.  
12) Exhaust Air Temperature Detecting Circuit  
Thisisacircuitfortransmittingoutputchangeofthermistor  
(Exhaust Air Temperature Sensor) to IC1.  
(fig. 1)  
13) High Voltage Monitoring Circuit.  
This model has a double quantity pad. When the oven  
is shipped, Magnification "1.8" is preset in the double  
quantity pad. This model has an defrost pad. When the  
oven is shipped, defrost is set as follows: fig.2.  
This circuit detects problems in the magnetron / high  
voltage circuit by sensing a variation in the current  
flowing through the primary winding of the high voltage  
transformer.  
During heating, the primary current of the high voltage  
transformers also flows through the primary winding of  
the current transformers CT1 and CT2. This causes a  
current to be induced in the secondary windings of CT1/  
CT2 and results in an AC voltage which is determined by  
R61/R62.  
1 STAGE  
POWER  
OVEN ON/OFF  
10%  
ON  
(fig. 2)  
17  
R-2397  
DESCRIPTION OF LSI  
LSI(IZA646DR)  
The I/O signal of the LSI(IZA646DR) is detailed in the following table.  
Pin No.  
Signal  
I/O  
Description  
Reference voltage input terminal.  
1
VREF  
IN  
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)  
2
3
IN7  
IN6  
IN  
IN  
Temperature measurement input: MAGNETRON THERMISTOR.  
ByinputtingDCvoltagecorrespondingtothetemperaturedetectedbythethermistor, this  
input is converted into temperature by the A/D converter built into the LSI.  
Temperature measurement input: EXHAUST THERMISTOR.  
ByinputtingDCvoltagecorrespondingtothetemperaturedetectedbythethermistor, this  
input is converted into temperature by the A/D converter built into the LSI.  
4
5
IN5  
IN4  
IN  
IN  
A/D input for troubleshooting Magnetron 1.  
Terminal to change functions according to the model.  
Signal in accordance with the model in operation is applied to set up its function.  
6
7
8
9
IN3  
IN2  
IN1  
IN0  
IN  
IN  
IN  
IN  
A/D input for troubleshooting Magnetron 2.  
Connected to GND.(0V)  
Terminal not used.  
Temperature measurement input: INTAKE THERMISTOR.  
ByinputtingDCvoltagecorrespondingtothetemperaturedetectedbythethermistor, this  
input is converted into temperature by the A/D converter built into the LSI.  
10  
11  
P47  
P46  
OUT  
OUT  
Terminal not used.  
Memory (EEPROM) clock output.  
12  
P45  
IN/OUT Memory (EEPROM) data input/output.  
13-14  
P44-P43  
OUT  
Magnetron high-voltage circuit driving signal.  
To turn on and off the cook relay. In 100% power level operation, "L" level during cooking;  
"H" level otherwise. In other power level operation (90,80,70,60,50,40,30,20,10 or 0%),  
"H" and "L" level is repeated according to power level.  
Power level  
100%  
90%  
ON  
OFF  
Power level  
ON  
OFF  
OFF  
GND  
48sec. 0sec.  
44sec. 4sec.  
40sec. 8sec.  
36sec. 12sec.  
32sec. 16sec.  
26sec. 22sec.  
40%  
22sec. 26sec.  
16sec. 32sec.  
12sec. 36sec.  
8sec. 40sec.  
0sec. 48sec.  
30%  
ON  
80%  
20%  
-5V  
48 sec.  
70%  
10%  
60%  
0%  
50%  
15  
P42  
OUT  
Power supply output at thermistor detecting circuit.  
(Output-5Vincookingonly,butapplyhighimpedancetootherstopreventthermistorfrom  
electrolytic corrosion ocurrence.)  
16  
17  
P41  
P40  
OUT  
OUT  
Terminal not used.  
Oven lamp, Blower motor and Stirrer motor driving signal. (Square Waveform :  
50Hz)  
During cooking  
To turn on and off the shut-off relay (RY1). The  
Square waveform voltage is delivered to the  
H
L
RY1  
relay  
driving  
circuit  
and  
20 msec  
relays(RY3,RY4,COOKRELAY)controlcircuit.  
18-22  
23  
P37-P33  
P32  
OUT  
OUT  
Terminal not used.  
0.12 sec  
Signal to sound buzzer.  
This signal is to control the 2.5kHz continuous  
signal.  
GND  
-5V  
A
2.4 sec  
1.2 sec  
1.2 sec  
B
C
A: key touch sound.  
B: Guydance sound.  
T
C: Completion sound.  
200µsec.  
200µsec.  
24  
P31  
IN  
Signal synchronized with commercial power source frequency.  
This is basic timing for all time processing of LSI.  
H : GND  
L (-5V)  
20 msec  
25  
26  
P30  
OUT  
IN  
Terminal not used.  
CNVSS  
Connected to Vc.(-5V)  
18  
R-2397  
Pin No.  
Signal  
I/O  
Description  
27  
RESET  
IN  
Auto clear terminal.  
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set  
to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at  
"H" level.  
28  
29  
XIN  
IN  
Internal clock oscillation frequency setting input.  
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with  
respect to XOUT terminal.  
XOUT  
OUT  
Internal clock oscillation frequency control output.  
Output to control oscillation input of XIN.  
30/31 XCIN/XCOUTIN/OUT Terminal not used.  
32  
VSS  
IN  
Power source voltage: -5V.  
VC voltage of power source circuit input.  
33  
34  
ø
OUT  
IN  
Terminal not used.  
R3  
Signal coming from touch key.  
When either one of G-12 line keys on key matrix is touched, a corresponding signal out  
of P11, P12, P14-P17 will be input into R3. When no key is touched, the signal is held at  
"L" level.  
35  
36  
37  
R2  
R1  
R0  
IN  
IN  
IN  
Signal similar to R3.  
When either one of G-11 line keys on key matrix is touched, a corresponding signal will  
be input into R2.  
Signal similar to R3.  
When either one of G-10 line keys on key matrix is touched, a corresponding signal will  
be input into R1.  
Signal similar to R3.  
When either one of G-9 line keys on key matrix is touched, a corresponding signal will  
be input into R0.  
38  
39  
VP  
IN  
Anode (segment) of Fluorescent Display light-up voltage: -31V  
Vp voltage of power source circuit input.  
P17  
OUT  
Segment data signal.  
The relation between signals and indicators are as follows:  
Signal  
Segment  
Signal  
Segment  
P24 .................. i  
P23 ................j,k  
P17 ............... LB  
P16 .............. UB  
P15 ................. h  
P14 ................. g  
P13 ..................... f  
P12 .................... e  
P11 .................... d  
P10 .................... c  
P07 .................... b  
P06 .................... a  
ß(50Hz)  
GND  
-31(V)  
Key strobe signal.  
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one  
of G-6 line keys on key matrix is touched.  
40  
41  
P16  
P15  
OUT  
OUT  
Segment data signal. Signal similar to P17.  
Key strobe signal.  
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one  
of G-5 line keys on key matrix is touched.  
Segment data signal. Signal similar to P17.  
Key strobe signal.  
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one  
of G-4 line keys on key matrix is touched.  
42-43  
44  
P14-P13  
P12  
OUT  
OUT  
Segment data signal.  
Signal similar to P17.  
Segment data signal. Signal similar to P17.  
Key strobe signal.  
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one  
of G-8 line keys on key matrix is touched.  
45  
P11  
OUT  
Segment data signal. Signal similar to P17.  
Key strobe signal.  
Signal applied to touch-key section. A pulse signal is input to R0-R3 terminal while one  
of G-7 line keys on key matrix is touched.  
19  
R-2397  
Pin No.  
Signal  
I/O  
Description  
46  
P10  
OUT  
Segment data signal.  
Signal similar to P17.  
47-48  
49  
P07-P06  
P05  
OUT  
OUT  
Segment data signal.  
Signal similar to P17.  
Digit selection signal.  
The relation between digit signal and digit are as  
follows:  
Digit signal Digit  
H
L
ß(50Hz)  
P05  
GND  
-31(V)  
P05  
P04  
P03  
P02  
P01  
P00  
1st.  
2nd.  
3rd.  
4th.  
5th.  
6th.  
P04  
P03  
P02  
P01  
P00  
Normally, one pulse is output in every ß period,  
and input to the grid of the Fluorescent Display.  
GND  
-31(V)  
50-54  
P04-P00  
OUT  
Digit selection signal.  
Signal similar to P16.  
55-57  
58-59  
P27-P25  
P24-P23  
OUT  
OUT  
Terminal not used.  
Segment data signal.  
Signal similar to P17.  
60  
P22  
OUT  
(Sound) Voltage level control terminal.  
This terminal (P22) is to control volume level of buzzer sound with terminals P21. Since  
the volume level of buzzer sound depends on voltage energized, it is control level in 3  
steps by combining signal levels for P22,P21. Relationship of signal level combination to  
soundvolumelevelisshowninthefollowingtable, 1~3inthetable, however, areindicated  
in the descending order from the maximum level of sound volume through the minimum  
level.  
Sound Volume  
1,(Max.)  
2,  
P21  
L
H
P22  
L
L
A : 1,(Max) 20V  
2, 13V  
3,(Min) 7V  
A
3,(Min.)  
L
H
*At Output terminal P32, rectangular wave signal of 2.5kHz is output.  
61  
62  
P21  
P20  
OUT  
IN  
Sound level control signal.  
Refer to above signal P22.  
Input signal which communicates the door open/close information to LSI.  
Door closed; "H" level signal(0V).  
Door opened; "L" level signal(-31.0V).  
63/64  
AVCC/VCC  
IN  
Connected to GND.  
2-2 Memory IC (IC2)  
AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512  
registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2  
are as shown in the following diagram.  
FUNCTIONAL DIAGRAM  
(3) Vcc  
H.V. GENERATION  
TIMING  
& CONTROL  
(4) Vss  
START CYCLE  
(5) SDA  
START  
STOP  
LOGIC  
TOP VIEW  
CONTROL  
LOGIC  
2
E
PROM  
64  
SLAVE ADDRESS  
REGISTER  
512 x 8  
XDEC  
VCC  
TEST  
SCL  
(6) SCL  
A0  
A1  
A2  
COMPARATOR  
1
8
7
6
INC  
LOAD  
WORD  
ADDRESS  
COUNTER  
2
3
4
1
64  
5
3
R/W  
YDEC  
8
CK  
Dout  
PIN  
DATA REGISTER  
SDA  
Dout  
ACK  
VSS  
5
Figure T-4 Relation between Pin Nos, and Signals  
20  
R-2397  
Pin No.  
1-3  
4
Signal  
A0-A2  
VSS  
I/O  
IN  
IN  
Description  
Connected to GND.  
Connected to VC(-5V).  
5
6
7
8
SDA  
SCL  
TEST  
VCC  
IN/OUT  
IN  
Serial data input/output : input/outputs data to IC1.  
Clock signal input : input/outputs sireal data at every one pulse.  
Connected to VC(-5V).  
IN  
IN  
Connected to GND.  
SERVICING  
1. Precautions for Handling Electronic Components  
This unit uses CMOS LSI in the integral part of the  
circuits. When handling these parts, the following pre-  
cautions should be strictly followed. CMOS LSI have  
extremely high impedance at its input and output termi-  
nals. For this reason, it is easily influenced by the  
surrounding high voltage power source, static electricity  
charge in clothes, etc, and sometimes it is not fully  
protected by the built-in protection circuit.  
repair all the controls (sensor-related ones included) of  
the touch control panel while keeping it connected to the  
oven.  
B. On some models, the power supply cord between the  
touch control panel and the oven proper is long enough  
that they may be separated from each other. For those  
models, therefore, it is possible to check and repair the  
controls of the touch control panel while keeping it apart  
from the oven proper; in this case you must short both  
ends of the door sensing switch (on PWB) of the touch  
control panel with a jumper, which brings about an  
operational state that is equivalent to the oven door  
being closed. As for the sensor-related controls of the  
touch control panel, checking them is possible if dummy  
resistor(s) with resistance equal to that of the controls  
are used.  
In order to protect CMOS LSI.  
1) When storing and transporting, thoroughly wrap them in  
aluminiumfoil. AlsowrapallPWboardscontainingthem  
in aluminium foil.  
2) When soldering, ground the technician as shown in the  
figure and use grounded soldering iron and work table.  
(2)Servicing the touch control panel with power supply from  
an external power source:  
approx. 1M ohm  
Disconnect the touch control panel completely from the  
oven proper, and short both ends of the door sensing  
switch (on PWB) of the touch control panel, which brings  
about an operational state that is equivalent to the oven  
door being closed. Connect an external power source to  
the power input terminal of the touch control panel, then  
it is possible to check and repair the controls of the touch  
control panel it is also possible to check the sensor-  
related controls of the touch control panel by using the  
dummy resistor(s).  
2. Shapes of Electronic Components  
Transistor  
2SA1561  
2SB1238  
Transistor  
DTA114YS  
DTB143ES  
DTD143ES  
KRA101M  
Transistor  
2SB953  
B
B
C
C
B
E
E
C
E
4. Servicing Tools  
3. Servicing of Touch Control Panel  
Tools required to service the touch control panel assem-  
bly.  
1) Soldering iron: 30W  
(It is recommended to use a soldering iron with a  
grounding terminal.)  
2) Oscilloscope:Singlebeam,frequencyrange:DC-10MHz  
type or more advanced model.  
3) Others: Hand tools  
We describe the procedures to permit servicing of the  
touch control panel of the microwave oven and the  
precautions you must take when doing so. To perform  
the servicing, power to the touch control panel is avail-  
able either from the power line of the oven itself or from  
an external power source.  
(1) Servicingthetouchcontrolpanelwithpowersupply  
of the oven:  
CAUTION: THEHIGHVOLTAGETRANSFORMEROF  
THE MICROWAVE OVEN IS STILL LIVE  
5. Other Precautions  
1) Before turning on the power source of the control unit,  
remove the aluminium foil applied for preventing static  
electricity.  
DURING SERVICING PRESENTS A HAZ-  
ARD.  
Therefore, when checking the performance of the touch  
control panel, put the outer cabinet on the oven to avoid  
touching the high voltage transformer, or unplug the  
primary terminal (connector) of the high voltage trans-  
former to turn it off; the end of such connector must be  
insulated with an insulating tape. After servicing, be  
sure to replace the leads to their original locations.  
A. On some models, the power supply cord between the  
touchcontrolpanelandtheovenitselfissoshortthatthe  
two can’t be separated. For those models, check and  
2) Connect the connector of the key unit to the control unit  
being sure that the lead wires are not twisted.  
3) After aluminium foil is removed, be careful that abnormal  
voltage due to static electricity etc. is not applied to the  
input or output terminals.  
4) Attach connectors, electrolytic capacitors, etc. to PWB,  
making sure that all connections are tight.  
5) Be sure to use specified components where high preci-  
sion is required.  
21  
R-2397  
PROCEDURE FOR CHECKING/CLEARING  
SERVICE COUNTS OF MICROWAVE OVEN  
PROCEDURE FOR ENTERING TO IC-2  
When the control unit or IC-2 is exchanged, re-enter the  
constants of DEFROST and the memory pads 1~20, refer-  
ring to items 1 and 2 below.  
The following procedure enables the servicer to obtain the  
total service counts (cook cycles) for memory cooking,  
double quantity cooking and defrost. The maximum capacity  
of the counter is 999,999 counts, above which the counter  
will reset to "0". The counter will retain the total counts (will  
not clear) in the event of a power disruption.  
1) How to enter the contents of DEFROST  
T = STG1 + STG2 + STG3  
STG = A x T + B  
1 stage 10% power level  
"
" : Flicker / : 0.1 sec BUZZER  
1) Practice for checking total service counts  
(eg; 234,567 Counts).  
PAD ORDER  
(Door close)  
SET  
DISPLAY  
PHONE  
.
.
.
• • •  
• • •  
0.1sec BUZZER  
flashing  
DISPLAY  
INDICATOR LED  
PAD  
PHONE  
SET  
"NUMBER"  
(Door close)  
(within 2 sec.)  
#1 START  
DEFROST  
9,9  
CHECK  
CHECK  
NUMBER  
#1  
CHECK  
CHECK  
"NUMBER"  
.
82 68  
1
1
0.00 DEF  
0.99 DEF  
(A)  
( user total count )  
x 2  
#2  
VOLUME  
SELECTATIME  
9
1
0 DEF  
90 DEF  
(+ - B)  
DEF  
VOLUME  
DOUBLE  
QUANTITY  
2 34 56 7  
1
( service total count )  
#2  
"POWER"  
100%  
1
NUMBER  
1
SELECTAPOWER  
1
90  
( after 1 sec. )  
DEF  
"POWER"  
10%  
45  
1
90  
( filter used time )  
SELECTATIME  
0
2
2
0.00 DEF  
0.00 DEF  
(A)  
2
NUMBER  
2
( after 1 sec. )  
2 00  
SELECTATIME  
0
2
2
0 DEF  
0 DEF  
(+ - B)  
0 DEF  
A DEF  
. DEF  
.
( filter lim. time )  
0 (No 10)  
NUMBER  
10  
SELECTATIME  
START  
SET  
3
3
4
( after 1 sec. )  
35 43 2  
( service total cook time )  
CHECK  
SET  
#1: Denotes total service counts within the reach of user, of  
which checking and clearing practices are described in  
#1 : No key entry signal.  
#2 : To set-B, touch the selectapower key twice.  
this instruction manual.  
#2: Denotes the procedure for the servicer to disable check-  
ing/clearing. This procedure is instructed to service per-  
sonnel only and is excluded from the operation manual.  
2) How to enter the memory information  
Example : Suppose cooking time 5 sec. and output power  
100% are entered into the memory pad 1.  
2) Practice for clearing Service's counts  
"
" : Flicker / : 0.1 sec BUZZER  
PAD ORDER  
DISPLAY  
PHONE  
PAD ORDER  
(Door close)  
CHECK  
DISPLAY  
PHONE  
(Door close)  
.
.
.
.
SET  
"NUMBER"  
.
CHECK  
SET  
"NUMBER"  
CHECK  
82 68  
"CHECK"  
(within 2 sec.)  
(User's Total Counts)  
82 68  
1
NUMBER 1  
NUMBER 1  
"NUMBER"  
. 0  
. 5  
.
#1 VOLUME  
VOLUME  
DOUBLE  
QUANTITY  
SET  
"CHECK"  
"CHECK"  
"CHECK"  
5
82 68  
SET  
SET  
2 34 56 7  
.
(Total Counts of Service)  
0
0
0
"CHECK"  
Enter the memory information into the memory pads 1 ~10  
referring to above example. The memory information are  
given below.  
0
"CHECK"  
"CHECK"  
SET  
CHECK  
.
#1: Denotes the procedure for the servicer to disable clear-  
ing. Thisprocedureisinstructedtoservicepersonnelonly  
and is excluded from the operation manual.  
22  
R-2397  
Memory No.  
Cook Time  
5 sec.  
Output Power  
100%  
1
2
10 sec.  
100%  
3
20 sec.  
100%  
4
30 sec.  
100%  
5
40 sec.  
100%  
6
7
50 sec.  
100%  
1 min.  
100%  
8
1 min. 15 sec.  
1 min. 30 sec.  
2 min.  
100%  
9
100%  
10  
11-20  
100%  
0 sec.  
Enter the memory information of magnification of double into  
the memory pads 1 ~ 20 (all 1.80).  
Ex, To set memory 1  
PAD ORDER  
SET  
DISPLAY  
PHONE  
.
SET  
"NUMBER"  
"NUMBER"  
NUMBER 1  
NUMBER 1  
"NUMBER"  
.
DOUBLE  
1
.
DOUBLE  
DOUBLE  
DOUBLE  
DOUBLE  
0.00  
1,8,0  
1.80  
x 3  
SET  
.
.
SET  
OTHER CHECKING AND CLEARING PRO-  
CEDURE  
1) To check the contents of defrost.  
"
" : Flicker / : 0.1 sec BUZZER  
PAD ORDER  
(Door close)  
CHECK  
DISPLAY  
PHONE  
.
.
"NUMBER"  
1
CHECK  
CHECK  
DEFROST  
0.99 DEF  
(A)  
DEF  
90  
CHECK  
POWER  
1
2
(+ - B)  
0.00 DEF  
(A)  
CHECK  
DEF  
0
CHECK  
POWER  
100%  
2
3
(+ - B)  
DEF  
A
CHECK  
POWER  
100%  
(Repeat)  
.
CHECK  
#1 : No key entry signal.  
2) How to clear all counter(user and service) and total  
cooking time and used time of filter.  
PAD ORDER  
(Door close)  
SET  
DISPLAY  
PHONE  
.
.
.
.
.
.
.
SET  
"NUMBER"  
"NUMBER"  
"NUMBER"  
"NUMBER"  
DOUBLE  
CHECK  
VOLUME  
SET  
DOUBLE  
DOUBLE  
DOUBLE  
23  
R-2397  
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE  
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below  
before operating the oven.  
1. CARRY OUT 3D CHECKS.  
1. Door does not close firmly.  
2. Makesurethatadefiniteclickcanbeheardwhenthe  
microwave oven door is unlatched. (Hold the door in  
a closed position, then pull the door release lever with  
one hand, this causes the latch leads to rise, it is then  
possible to hear a “click’ as the door switches oper-  
ate.)  
2. Door hinge, support or latch hook is damaged.  
3. The door gasket or seal or damaged.  
4. The door is bent or warped.  
5. There are defective parts in the door interlock system.  
6. Therearedefective partsinthemicrowavegenerating  
and transmission assembly.  
3. Visually check the door and cavity face plate for  
damage (dents, cracks, signs of arcing etc.).  
7. There is visible damage to the oven.  
Do not operate the oven:  
Carry out any remedial work that is necessary before  
operating the oven.  
Do not operate the oven if any of the following conditions  
exist;  
1. Without the RF gasket (Magnetron).  
2. If the wave guide or oven cavity are not intact.  
3. If the door is not closed.  
4. If the outer case (cabinet) is not fitted.  
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal  
procedures:  
OUTER CASE REMOVAL  
To remove the outer case, proceed as follows.  
CAUTION:DISCHARGEHIGHVOLTAGECAPACI-  
1. Disconnect oven from power supply.  
TOR BEFORE TOUCHING ANY OVEN  
2. Open the oven door and wedge it open.  
COMPONENTS OR WIRING.  
3. Remove the two (2) screws from the lower portion of the  
rear cabinet and lower left portion of the oven cabinet  
back side using by special screw drive (Type; LHSTIX  
DLR4-100T).  
4. Remove the screws from rear and along the side edge  
of case.  
5. Slide the entire case back about 3cm to free it from  
retaining clips on the cavity face plate.  
6. Lift the entire case from the oven.  
7. Remove the screws holding the rear cabinet to the oven.  
8. Remove the rear cabinet.  
Special screw  
9. Discharge the HV capacitor before carrying out any  
further work.  
10.Do not operate the oven with the outer case removed.  
N.B.; Step 1,2 and 9 form the basis of the 3D checks.  
Screw Driver  
(Type; LHSTIX DLR4-100T)  
HIGH VOLTAGE COMPONENTS REMOVAL  
(High Voltage Capacitor and High Voltage Rectifier Assembly)  
To remove the components, proceed as follows.  
1. CARRY OUT 3D CHECKS.  
CAUTION  
1. DO NOT REPLACE ONLY HIGH VOLTAGE REC-  
TIFIER. WHEN REPLACE IT, REPLACE HIGH  
VOLTAGE RECTIFIER ASSEMBLY.  
2. WHENREPLACINGHIGHVOLTAGERECTIFIER  
ASSEMBLY, ENSURE THAT THE CATHODE  
(EARTH) CONNECTION IS SECURELY FIXED  
TO THE CHASSIS WITH A EARTHING SCREW.  
2. Removetwo(2)screwsholdingearthsideterminalsof  
high voltage rectifier assemblies.  
3. Disconnect all the leads and terminals of high voltage  
rectifier assembly from high voltage capacitor.  
4. Removetwo(2)screwsholdingcapacitorholdertothe  
right side of oven cavity and remove the capacitor  
holder.  
6. Now, the two (2) high voltage capacitors are free.  
5. Now, high voltage rectifier assembly should be free.  
24  
R-2397  
MAGNETRON REMOVAL  
1. Remove the outer case cabinet referring to "OUTER  
CASE REMOVAL" and CARRY OUT 3D CHECKS.  
2. Remove the eleven (11) screws holding the rear  
cabinet to the oven cavity.  
8. Carefully remove each four (4) screws holding each  
two (2) magnetrons to waveguide. When removing  
the screws hold the magnetron to prevent it from  
falling.  
3. Disconnectthepowersupplycordfromthenoisefilter.  
4. Removetheone(1)screwholdingtheearthwireofthe  
power supply cord to the noise filter angle.  
5. Remove the rear cabinet with the power supply cord  
from the oven cavity.  
6. Remove the two (2) screws holding the magnetron  
exhaust duct to upper and lower waveguide.  
7. Disconnect all the wire leads from the two (2)  
magnetrons.  
9. Removethemagnetronfromthewaveguidewithcare  
so the magnetron antenna is not hit by any metal  
object around the antenna.  
10.Now, the magnetron is free.  
CAUTION: WHEN REPLACE THE MAGNETRON,  
BESURETHER.F.GASKETISINPLACE  
AND THE MAGNETRON MOUNTING  
SCREWS TIGHTENED SECURELY.  
HIGH VOLTAGE TRANSFORMER REMOVAL  
1. Remove the outer case cabinet referring to "OUTER  
CASE REMOVAL" and CARRY OUT 3D CHECKS.  
2. Disconnect the all wire leads from the magnetron(s).  
3. Remove the wire holder holding the high voltage  
wires.  
4. Disconnect all wire leads from the high voltage  
transformer(s).  
5. Remove the each two (2) screws holding each high  
voltage transformer.  
6. Now, high voltage transformer(s) is (are) free.  
BLOWER MOTOR REMOVAL  
4. Remove the one (1) screw holding the blower motor to  
1. CARRY OUT 3D CHECKS.  
2. Disconnect the wire leads from the blower motor and  
the blower motor thermal cut-out.  
3. Remove the one (1) screw holding the blower motor to  
the oven cavity.  
the chassis support.  
5. Remove the blower motor. Now, the blower motor is  
free.  
STIRRER MOTOR (UPPER) REMOVAL  
3. Remove the one (1) screw holding the stirrer motor  
(upper) to the oven cavity.  
4. Turn and lift up the stirrer motor (upper).  
5. Now, the stirrer motor (upper) is free.  
1. Remove the outer case cabinet referring to "OUTER  
CASE REMOVAL" and CARRY OUT 3D CHECKS.  
2. Disconnect the wire leads from the stirrer motor (up-  
per).  
STIRRER MOTOR (LOWER) REMOVAL  
1. Disconnect oven from the power supply.  
2. Remove the stirrer motor cover by snipping off the  
material in four portions.  
3. Where the portions have been snipped off bend the  
portions flat. No sharp edge must be evident after  
removal of the stirrer cover.  
5. Remove one (1) screw holding the stirrer motor to  
oven cavity.  
6. Now, the stirrer motor (lower) is free.  
7. Afterreplacementusetheone(1)screwtofitthestirrer  
motor cover. (This screw has been fitted to the base  
plate near the stirrer motor cover beforehand.)  
4. Disconnect wire leads from the stirrer motor. (See  
"Positive lock connector removal")  
OVEN LAMP SOCKET REMOVAL  
Oven lamp  
socket  
Terminal  
1. CARRY OUT 3D CHECKS.  
2. Remove the oven lamp.  
Wire lead  
3. Pull the wire leads from the oven lamp socket by  
pushing the terminal hole of the oven lamp socket with  
the flat type small screw driver.  
Flat type small  
screw driver  
4. Lift up the oven lamp socket.  
5. Now, the oven lamp socket is free.  
Terminal hole  
Figure C-1. Oven lamp socket  
25  
R-2397  
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL  
Replacement of individual component is as follows:  
CONTROL PANEL ASSEMBLY REMOVAL  
The complete control panel should be removed for re-  
placement of components. To remove the control panel,  
proceed as follows:  
CONTROL UNIT AND CONTROL PANEL FRAME  
(WITH KEY)  
7. Remove two (2) screws holding the control panel  
1. CARRY OUT 3D CHECKS.  
2. Remove the air intake filter assembly from the base  
plate.  
3. Remove two (2) screws holding the control panel to  
the base plate.  
4. Pull down the control panel and remove it forward.  
5. Disconnect two connectors (A), (B), (D), (H) and TAB  
terminal (TAB1,2,3,4) from the control unit.  
6. Now the control panel assembly is free.  
mounting angle to the panel frame.  
8. Liftupthecontrolpanelmountinganglefromthepanel  
frame.  
9. Disconnect connector (G) from the control unit by  
pushing the hooks of cable holder inwardly.  
10.Remove four (4) screws holding the control unit to the  
panel frame assembly.  
11.Push down the right side two (2) hooks fixing the  
controlunittothepanelframeassembly, andliftupthe  
control unit upward.  
CAUTION FOR TOUCH CONTROL PANEL REMOVAL  
1) Hold the lower end (Position A, Fig. 1) of the touch  
control panel assembly firmly while sliding it down and  
toward you.  
12.Now, the control unit and control panel frame (with  
key) are free.  
CAUTION:  
DO NOT FORCE THE CONTROL UNIT TO SLIDE  
DOWN DURING REMOVAL. THIS MAY CAUSE DAM-  
AGE TO THE CONTROL UNIT BY HITTING A RELAY  
(RY-4) OR THE TAB TERMINALS LOCATED AT THE  
FRONT OF THE OVEN CAVITY.  
At installing control panel unit assembly to main  
body set:  
1. Ensuretheinstallationofwiring-relatedpartswith-  
out negligence.  
2. Wheninsertingkeycabletomainbodyset, ensure  
themfreefromcaught-introuble.Inaddition,when  
installingthecontrolpanelassemblytobaseplate  
with screws, be sure of pushing the control panel  
unit upward to fix with screws firmly.  
3. Do not allow any wire leads to come near the  
varistor works, because it will explode and the  
wire leads near by the varistor will be damaged.  
2) If the Touch Control Panel is hard to remove;  
(1) Insert a flat head screw driver into space B . (Fig. 1)  
(2) Rotate the screwdriver clockwise while holding posi-  
tion C of the Touch Control Panel. (Fig. 2)  
TO AVOID DAMAGE TO TOUCH CONTROL PANEL,  
COVER THE TIP OF SCREWDRIVER WITH TAPE.  
(3) Re-solder the Relay (RY-4) prior to reinstalling the  
Touch Control Panel.  
NOTE: 1. Before attaching a new key unit, remove  
remainingadhesiveonthecontrolpanelframe  
surfaces completely with alcohol.  
Fig. 2  
Fig. 1  
B
B
2. When attaching the key unit to the control  
panel frame, adjust the upper edge and right  
edge of the key unit to the correct position of  
control panel frame.  
3. Stick the key unit firmly to the control panel  
frame by rubbing with soft cloth not to scratch.  
A
C
TOUCH CONTROL PANEL  
SCREW DRIVER  
HOW TO RELEASE THE POSITIVE LOCK® CONNECTOR.  
Terminal  
Procedure  
1. Pushing the lever of positive lock® connector.  
2. Pull down the connector from the terminal.  
3. Now, the connector is free.  
Positive lock®  
connector  
1
Note: If the positive lock® has a insulation sleeve, first  
remove it. If you do not so, you can not push the  
lever of positive lock®.  
Push  
Lever  
CAUTION: The positive lock® terminal can not be dis-  
connected by only pulling. Because once  
you (Service personnel) have connected the  
positive lock® connector to the terminal, the  
positive lock® connector has been locked.  
2
Pull down  
Figure C-2. How to release the positive lock connector.  
26  
R-2397  
POWER SUPPLY CORD REPLACEMENT  
1. CARRY OUT 3D CHECKS  
4. Re-install the cord bushing to the rear cabinet.  
5. Re-install the rear cabinet to oven cavity and the  
bottom plate with the eleven (11) screws and two (2)  
washers.  
2. Release the cord bushing from the rear cabinet.  
3. Disconnect the brown and blue wires of the power  
supply cord from the noise filter.  
4. Loosen the single (1) screw holding the earth angle  
and earth wire of power supply cord.  
6. CARRY OUT 4R CHECKS.  
5. Remove the power supply cord.  
Noise filter unit  
BLK  
CAUTION: DO NOT ALLOW THE WIRE LEADS OF  
THE POWER SUPPLY CORD TO COME  
NEAR THE HIGH VOLTAGE TRANS-  
FORMER. BECAUSE THE HIGH VOLT-  
AGE TRANSFORMER BECOMES HOT.  
WHT  
Blue wire  
N
Brown wire  
Power  
supply  
cord  
L
Re-install  
Screw  
1. Insert the power supply cord into the cord bushing.  
2. Connect the brown and blue wires of power supply  
cord into the terminals of noise filter, referring to  
pictorial diagram.  
3. Insert the green/yellow wire of power supply cord  
into the earth angle, and tight the screw holding the  
earth angle.  
Cord  
bushing  
Rear  
cabinet  
Green/Yellow  
wire  
Figure C-3. Power supply cord replacement  
1ST LATCH, 2ND LATCH, 3RD LATCH, MONITOR, AND STOP SWITCHES REMOVAL  
1. CARRY OUT 3D CHECKS.  
latch hook.  
2. Remove the control panel from the oven cavity refer-  
ring to “CONTROL PANEL REMOVAL”.  
3. Remove the two (2) screws holding the latch hook to  
the oven cavity.  
4. Open the door and pull the latch hook out of the oven  
cavity.  
5. For 1st latch, 2nd latch or Monitor switch removal  
5-1. Disconnect the wire leads from the switch.  
5-2. Push the retaining tabs outward slightly and then  
pull the switch forwards and remove it from the  
6. For 1st latch and stop switches removal  
6-1. Disconnect the wire leads from the 1st latch and  
stop switches.  
6-2. Remove the single (1) screw and nut holding the  
1st latch and stop switches to the latch hook.  
CAUTION: WHEN THE 1ST LATCH SWITCH AND  
2ND. LATCH SWITCH ARE INSTALLED,  
THE TWO (2) TABS OF THE LATCH  
HOOK SHOULD BE BROKEN.  
1ST, 2ND, 3RD LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT  
In case 1st latch switch, 2nd latch, stop switch, 3rd latch  
switch and monitor switch do not operate properly due to a  
mis-adjustment, the following adjustment should be made.  
1. Loosen the two (2) screws holding the latch hook.  
2. With the door closed, adjust the latch hook by moving it  
back and forward, or up and down. In and out play of the  
door allowed by the latch hook should be less than  
0.5mm. The vertical position of the latch hook should be  
placed where the stop switch and 1st, 2nd, 3rd latch  
switches have activated with the door closed.  
The horizontal position of the latch hook should be  
placed where the monitor switch has activated with the  
door closed.  
circuit when the door is opened.  
2. Re-install outer case and check for microwave leakage  
around the door with an approved microwave survey  
Door release  
Latch head  
lever  
Monitor switch  
Latch hook  
3. Secure the screws with washers firmly.  
4. Make sure of the 1st, 2nd, 3rd latch switches, stop  
switch, and monitor switch operation. If those switches  
have not activated with the door closed, loose two (2)  
screws holding latch hook and adjust the latch hook  
position.  
2nd. latch switch  
1st. latch switch  
Joint lever  
Latch lever  
Stop switch  
After adjustment, make sure of the following:  
Latch head  
1. Thestopswitchand1st, 2nd, 3rdlatchswitchesinterrupt  
the circuit before the door open when the door release  
lever is pulled, and then and monitor switch close the  
3rd. latch switch  
meter. (Refer to Microwave Measurement Procedure.)  
Figure C-4 Latch Switch Adjustments  
27  
R-2397  
DOOR REPLACEMENT AND ADJUSTMENT  
DOOR REPLACEMENT  
1. CARRY OUT 3D CHECKS.  
2. Remove four (4) screws holding the upper and lower  
oven hinge to the oven cavity.  
FLATE TYPE  
SCREW DRIVER  
3. Remove door assembly with upper and lower oven  
hinges by pulling it forward.  
4. On re-installing new door assembly, secure the upper  
and lower oven hinges with the four (4) mounting  
screws to the oven cavity. Make sure the door is  
parallel with bottom line of the oven face plate and the  
latch head pass through the latch holes correctly.  
5. CARRY OUT 4R CHECKS.  
PROTECTION  
BY TAPE  
Note: After any service to the door, the approved  
microwavesurveymetershouldbeusedtoassure  
in compliance with proper microwave radiation  
standards. (Refer to Microwave Measurement  
Procedure.)  
LOWER  
OVEN HING  
CHOKE  
COVER  
DOOR  
PANEL  
UPPER  
OVEN HING  
DOOR ADJUSTMENT  
When removing and/or loosening hinges such as in door  
replacement, the following adjustment criteria are taken.  
Door is adjusted to meet the following three conditions by  
keeping screws of hinge loose.  
Figure C-6. Choke Cover Removal  
DOOR COMPONENTS REMOVAL  
Remove the door assembly, referring to from item 1  
1. Adjust door latch heads at a position where they  
smoothly catch the latch hook through the latch holes.  
Refer to latch switch adjustments.  
2. Deviation of the door alignment from horizontal line of  
cavity face plate is to be less than 1.0mm.  
3. The door is positioned with its face depressed toward  
the cavity face plate.  
4. Reinstalloutercaseandcheckformicrowaveleakage  
around the door with an approved microwave survey  
meter. (Refer to Microwave Measurement Proce-  
dure.)  
through item 3 of “DOOR REPLACEMENT”.  
1. Place the door assembly on a soft cloth with facing up.  
(UPPER AND LOWER OVEN HINGE REMOVAL)  
2. Removethechokecover,referringtoCHOKECOVER  
REMOVAL”.  
3. Release the oven hinges from the door panel.  
4. Now, the oven hinges are free.  
(DOOR HANDLE REMOVAL)  
5. Remove the two (2) screws holding the door handle to  
door.  
6. Remove the door handle from the door panel.  
(UPPER AND LOWER LATCH HEADS REMOVAL)  
7. Remove the door release lever from the door assem-  
bly.  
8. Remove the three (3) screws holding the joint plate to  
the door panel.  
UPPER  
OVEN  
HINGE  
OUTER CASE  
CABINET  
DOOR  
ASSEMBLY  
9. Release the latch spring from the tab of the joint lever  
and joint plate.  
10.Releasethelatchheadsfromjointleverandjointplate.  
11.Now, the latch heads are free.  
LOWER  
OVEN  
HINGE  
(DOOR FRAME REMOVAL)  
12.Set the four (4) tabs of the door frame upright.  
13.Remove the door frame from the door panel. Now,  
door frame is free.  
LATCH HEADS  
Figure C-5. Door Assembly Replacement and Adjustment  
CHOKE COVER REMOVAL  
(DOOR GLASS REMOVAL)  
14.Removethefour(4)screwsholdingthetwo(2)outside  
window fixing plates to the door panel.  
15.Now, the door glass is free.  
1. Insert an iron plate (thickness of about 0.5mm or flat  
type screw driver to the gap between the choke cover  
and door panel as shown figure to free the engaging  
part. The protect sheet may be used not to damage  
the door panel.  
2. Lift up the choke cover, now cove is free.  
28  
R-2397  
SERVICE INFORMATION  
IMPORTANT: When replace the magnetron MG1 and/or MG2, the relays RY3 and RY4 on control unit must be  
replacedatthesametime.Becauseifthemagnetron'slifehasbeenover,therelay'slifemayalso  
be over.  
MICROWAVE MEASUREMENT  
Recommended instruments are:  
NARDA 8100  
NARDA 8200  
HOLADAY HI 1500  
SIMPSON 380M  
After adjustment of door latch switches, monitor switch  
and door are completed individually or collectively, the  
following leakage test must be performed with a survey  
instrument and it must be confirmed that the result meets  
the requirements of the performance standard for micro-  
wave oven.  
2. Place the oven tray into the oven cavity.  
3. Place the load of 275 ± 15ml of water initially at 20  
± 5˚C in the centre of the oven tray. The water  
container should be a low form of 600 ml beaker  
with inside diameter of approx. 8.5cm and made of  
an electrically non-conductive material such as glass  
or plastic.  
REQUIREMENT  
The safety switch must prevent microwave radiation  
emission in excess of 5mW/cm2 at any point 5cm or more  
from external surface of the oven.  
The placing of this standard load in the oven is impor-  
tant not only to protect the oven, but also to insure that  
any leakage is measured accurately.  
4. Close the door and turn the oven ON with the timer set  
for several minutes. If the water begins to boil before  
the survey is completed, replace it with 275ml of cool  
water.  
5. Move the probe slowly (not faster that 2.5cm/sec.)  
along the gap.  
6. The microwave radiation emission should be meas-  
ured at any point of 5cm or more from the external  
surface of the oven.  
PREPARATION FOR TESTING:  
Before beginning the actual test for leakage, proceed as  
follows;  
1. Make sure that the test instrument is operating nor-  
mally as specified in its instruction booklet.  
Important:  
Survey instruments that comply with the requirement  
for instrumentations as prescribed by the perform-  
ance standard for microwave ovens must be used for  
testing.  
SHARP  
mW cm 2  
mW cm 2  
Microwave leakage measurement at 5 cm distance  
29  
R-2397  
SCHEMATIC  
NOTE: CONDITION OF OVEN  
1. DOOR CLOSED  
NOTE: " " INDICATES COMPONENTS WITH POTENTIALS ABOVE 250V.  
2.  
APPEARS ON DISPLAY  
C1 and C2: 1.07µF/ AC 2100V  
MAGNETRON  
THERMAL CUT OUT  
145C°(LOWER)  
TC2:  
F4: WEAK POINT A018  
2ND LATCH SWITCH  
C1: H.V. CAPACITOR  
F3:  
WEAK POINT  
A018  
TC1 :MAGNETRON  
THERMAL  
CUT OUT  
145C°(UPPER)  
ASYMMETRIC  
RECTIFIER  
CONTROL  
UNIT  
C2: H.V. CAPACITOR  
ASYMMETRIC  
RECTIFIER  
1ST LATCH SWITCH  
(PRIMARY INTERLOCK SWITCH)  
3RD LATCH SWITCH  
Figure O-1. Oven SChematic-OFF Condition  
SCHEMATIC  
NOTE: CONDITION OF OVEN  
1. DOOR CLOSED.  
2. TIME KEY TIUCHED.  
3. COOKING TIME PROGRAMMED.  
4. START KEY TOUCHED  
TC2:  
MAGNETRON  
THERMAL CUT OUT  
145C°(LOWER)  
F4: WEAK POINT A018  
2ND LATCH SWITCH  
C1: H.V. CAPACITOR  
F3:  
WEAK POINT  
A018  
TC1 : MAGNETRON  
THERMAL  
CUT OUT  
145C°(UPPER)  
ASYMMETRIC  
RECTIFIER  
CONTROL  
UNIT  
C2: H.V. CAPACITOR  
ASYMMETRIC  
RECTIFIER  
1ST LATCH SWITCH  
(PRIMARY INTERLOCK SWITCH)  
3RD LATCH SWITCH  
Figure O-2. Oven SChematic-ON Condition  
30  
R-2397  
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
H . V . R E C T I F I E R  
H . V . R E C T I F I E R  
G
G
H
H
6
4
5
2
1
3
31  
R-2397  
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
K E Y U N I T  
R 9 3 ~ R 1 0 1 : 1 5 K  
X
9
D 9 3 R 9 3  
D 9 4 R 9 4  
D 9 5 R 9 5  
D 9 6 R 9 6  
D 9 7 R 9 7  
C 3 0  
1 5 K  
R 3 1  
8
1
5
A T 2 4 C 0 4  
I C - 1 I Z A 6 4 6 D R  
I C 2  
4
1 . 8 K  
R 5 0  
C 7  
1 5 K  
R 5  
1 M  
R 3 0 0  
2 5 V  
F µ 2 2  
+
_
R 3 3 1 0 K  
R 3 2 2 . 7 K  
C 9  
H Z 4 C 3  
1 K  
R 4  
5 0 V  
C 2 2  
F µ 0 . 1  
Z D 2  
C 7 4  
C 6  
1 5 K  
R 2 0  
F µ , 1 4 0 7 V  
C 2 0  
4 . 7 K  
R 2 0 0  
+
_
C 5  
F µ , 2 5 V 0 . 0 1  
C 4  
D 6 4  
D 6 3  
1 6 V  
F µ , 5 0 3 V . 3  
F µ 1 0 0  
+
_
+
_
3 . 3 K  
C 3  
H Z 1 2 C 1  
C 8  
R 7 4  
2 0 K  
1 . 1 K  
R 7 2  
Z D 1  
1 . 8 K  
R 1  
R 7 3  
F µ , 3 5 V 1 0 0 0  
_
C 2  
F µ , 5 0 2 V . 2  
1 0 0  
+
5 0 V  
+
_
_
F µ 0 . 0 1  
D O O R R 7 0 D 7 1  
C 8 1  
F µ , 1 5 0 V  
C 2 1  
+
F µ , 5 0 0 V . 1  
C 8 2  
F µ , 5 0 V 0 . 0 1  
C 7 0  
C 1  
2 5 V  
F µ 2 2  
_
C 6 1  
2 5 V  
F µ 2 2  
+
+
G
G
_
C 6 2  
3 0 0 K  
R 6 5  
3 0 0 K  
R 6 6  
D 8 1  
R Y 1  
D 8 3  
R Y 3  
D 8 4  
1 5 G 4 7 1 K  
V R S 1  
R Y 4  
1 . 5 K F  
R 6 1  
1 . 5 K F  
R 6 2  
H
H
6
4
5
2
1
3
32  
R-2397  
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
1
10  
20  
26  
1
2
3
R101  
R100  
R99  
(J1)  
R4  
R300  
R96  
D95  
R95  
R94  
D94  
D93  
R93  
(R92)  
(R91)  
R97  
(D92)  
(D91)  
D97  
D96  
R96  
R71  
B
(Q201)  
E
(Q200)  
(J3)  
(D200)  
(D74  
.R50)  
2
3
1
5
4
4
5
1
12  
R63  
(J11)  
8
R65  
G
G
H
H
Figure S-3. Printed Wiring Board  
6
4
5
2
1
3
33  
R-2397  
PARTS LIST  
Note: The parts marked "" may cause undue microwave exposure.  
The parts marked "*" are used in voltage more than 250V.  
REF. NO.  
PART NO.  
DESCRIPTION  
Q'TY CODE  
ELECTRIC PARTS  
1- 1  
1- 2  
1- 3  
1- 4  
1- 5  
1- 6  
1- 7  
1- 8  
1- 9  
1-10  
1-11  
1-12  
1-13  
1-14  
1-15  
1-16  
1-17  
1-18  
1-19  
1-20  
1-21  
1-22  
1-23  
1-24  
1-25  
1-26  
1-27  
1-28  
1-29  
FH-HZA050WRE0 Magnetron thermistor  
QSOCLA011WRE0 Oven lamp socket  
FH-HZA049WRE0 Intake thermistor  
FPWBFA296WRE0 Noise filter  
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
2
1
1
2
1
1
2
1
1
1
2
2
2
AP  
AH  
AL  
AW  
AH  
BG  
AP  
BB  
AK  
AF  
AF  
AF  
AF  
AF  
AX  
AK  
AR  
AG  
AG  
BL  
AF  
AD  
AD  
AF  
BH  
AG  
BP  
AM  
AP  
QFSHDA019WRE0 Fuse holder  
QACCVA066WRE0 Power supply cord for European continental use  
DH-HZA009WRK0 Exhaust thermistor  
FW-QZA106WRK0 High voltage rectifier assembly  
RTHM-A091WRE0 Oven thermal cut-out 115˚C  
QSW-MA085WRE0 Stop switch  
*
QSW-MA086WRE0 Monitor switch  
QSW-MA095WRE0 1st. latch switch  
QSW-MA095WRE0 2nd. latch switch  
QSW-MA095WRE0 3rd. latch switch  
RC-QZA165WRE0 High voltage capacitor  
RLMPTA028WRE0 Oven lamp  
*
RMOTDA209WRE0 Stirrer motor  
RTHM-A037WRE0 Magnetron thermal cut-out 145˚C  
RTHM-A057WRE0 Magnetron thermal cut-out 145˚C  
RV-MZA239WRE0 Magnetron  
QFS-CA017WRE0 Weak point A017  
QFS-CA007WRE0 Fuse F6.3A  
QFS-CA018WRE0 Weak point A018  
RR-WZA020WRE0 Monitor resistor 4.3 20W  
FMOTEA309WRK0 Blower motor  
*  
RTHM-A058WRE0 Thermal cut-out 115˚C  
RTRN-A459WRE0 High voltage transformer  
RFIL-A004WRE0 Ferrite clamp R  
*
RFIL-A002WRE0 Ferrite clamp  
CABINET PARTS  
2- 1  
2- 2  
2- 3  
2- 4  
2- 5  
2-5-1  
2-5-2  
2-6  
FDAI-A183WRW0 Base plate assembly  
PSHEGA006WRE0 Rubber sheet A  
PSHEGA007WRE0 Rubber sheet B  
GCOVAA250WRW0 Rear cabinet  
FFTASA064WRY0 Oven lamp access cover assembly  
PCUSU0407WRP0 Cushion  
PREFHA059WRP0 Lamp reflector  
GCABUA523WRP0 Outer case cabinet  
PZETEA071WRP0 Cabinet insulation sheet  
1
2
2
1
1
1
1
1
1
BC  
AF  
AE  
AX  
AN  
AA  
AF  
BA  
AF  
2-7  
CONTROL PANEL PARTS  
3- 1  
3- 1A  
3- 1B  
3- 1C  
3- 1D  
3- 1E  
3- 1F  
3- 1G  
3- 1H  
C1  
C2  
C3  
C4  
C5  
C6-7  
C8  
C9  
C20  
C21  
C22  
C30  
C61-62  
C70  
C71  
DPWBFB382WRU0 Control unit  
1
1
1
1
1
1
4
1
2
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
BQ  
AC  
AB  
AB  
AF  
AB  
AB  
AW  
AC  
AB  
AD  
AA  
AA  
AA  
AA  
AB  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AB  
QCNCMA308DRE0 4-pin connector (A)  
QCNCMA312DRE0 3-pin connector (B)  
QCNCMA145DRE0 3-pin connector (D)  
QCNCWA030DRE0 12-pin connector (G)  
QCNCMA039DRE0 3-pin connector (H)  
QLUG-A002PRE0 Tab terminal (TAB1-4)  
RV-KXA053DRE0 Fluorescent display tube  
PCUSGA359WRP0 Cushion  
VCKYD11HF104Z Capacitor 0.1 uF 50V  
RC-EZA192DRE0 Capacitor 1000 uF 35V  
VCEAB31HW335M Capacitor 3.3 uF 50V  
VCKYB11EX103N Capacitor 0.01 uF 25V  
VCEAB31AW476M Capacitor  
VCKYD11CY103N Capacitor 0.01 uF 16V  
VCEAB31CW107M Capacitor 100 uF 16V  
47 uF 10V  
VCEAB31EW226M Capacitor  
22 uF 25V  
VCKYD11CY103N Capacitor 0.01 uF 16V  
VCKYF31HF103Z Capacitor 0.01 uF 50V  
VCKYD11CY103N Capacitor 0.01 uF 16V  
VCKYD11CY103N Capacitor 0.01 uF 16V  
VCEAB31EW226M Capacitor  
22 uF 25V  
VCKYF31HF103Z Capacitor 0.01 uF 50V  
VCKYD11CY103N Capacitor 0.01 uF 16V  
VCKYB11EX103N Capacitor 0.01 uF 25V  
VCKYD11HF104Z Capacitor 0.1 uF 50V  
C72  
C74  
34  
R-2397  
Note: The parts marked "" may cause undue microwave exposure.  
The parts marked "*" are used in voltage more than 250V.  
REF. NO.  
PART NO.  
DESCRIPTION  
Q'TY CODE  
C80  
C81  
C82  
C200  
CF1  
D1-4  
D5  
D6-7  
D61-64  
D70  
D71  
D81  
D83-84  
D93-97  
IC1  
IC2  
Q1  
Q2  
Q20  
Q40  
Q41  
Q80  
Q81  
Q83-84  
R1  
R3  
R4  
R5  
R6  
R20  
R31  
R32  
R33  
R40  
R41  
R42  
R43  
R50  
R61-62  
R63-64  
R65-66  
R67-68  
R70  
R71  
R72  
R73  
R74  
R79  
R80  
VCEAB31HW104M Capacitor 0.1 uF 50V  
VCEAB31HW225M Capacitor 2.2 uF 50V  
VCEAB31HW105M Capacitor 1.0 uF 50V  
VCKYD11CY103N Capacitor 0.01 uF 16V  
RCRS-A010DRE0 Ceramic resonator CST4.00MGW  
VHD11ES1///-1 Diode (11ES1)  
VHD1SS270A/-1 Diode (1SS270A)  
VHD11ES1///-1 Diode (11ES1)  
VHD1SS270A/-1 Diode (1SS270A)  
VHD11ES1///-1 Diode (11ES1)  
VHD1SS270A/-1 Diode (1SS270A)  
VHD1SS270A/-1 Diode (1SS270A)  
VHD1SS270A/-1 Diode (1SS270A)  
VHD1SS270A/-1 Diode (1SS270A)  
RH-IZA646DRE0 LSI  
1
1
1
1
1
4
1
2
4
1
1
1
2
5
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
1
1
1
1
1
1
1
2
9
1
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
6
1
1
AM  
AA  
AA  
AA  
AD  
AB  
AA  
AB  
AA  
AB  
AA  
AA  
AA  
AA  
AX  
AP  
AG  
AA  
AA  
AA  
AA  
AB  
AC  
AC  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AB  
AA  
AG  
AK  
AG  
AU  
AH  
AE  
AA  
AA  
AZ  
AU  
AP  
AB  
AF  
AA  
AA  
AB  
RH-IZA571DRE0 IC (AT24C04)  
VS2SB953-PQ-4 Transistor (2SB953)  
VS2SA1561TL-3 Transistor (2SA1561TL)  
RH-TZA037CBE0 Transistor (KRA101M)  
RH-TZA037CBE0 Transistor (KRA101M)  
VS2SB1238//-3 Transistor (2SB1238)  
VSDTA114YS/-3 Transistor (DTA114YS)  
VSDTD143ES/-3 Transistor (DTD143ES)  
VSDTB143ES/-3 Transistor (DTB143ES)  
VRD-B12EF182J Resistor 1.8k ohm  
VRD-B12HF561J Resistor 560 ohm  
VRD-B12EF102J Resistor 1.0k ohm  
1/4W  
1/2W  
1/4W  
1/4W  
1/2W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
VRD-B12EF153J Resistor  
VRD-B12HF150J Resistor  
VRD-B12EF153J Resistor  
VRD-B12EF153J Resistor  
15k ohm  
15 ohm  
15k ohm  
15k ohm  
VRD-B12EF272J Resistor 2.7k ohm  
VRD-B12EF103J Resistor 10k ohm  
VRD-B12EF332J Resistor 3.3k ohm  
VRD-B12EF203J Resistor  
VRD-B12EF393J Resistor  
VRD-B12EF103J Resistor  
20k ohm  
39k ohm  
10k ohm  
VRD-B12EF182J Resistor 1.8k ohm  
VRN-B12EK152F Resistor 1.5k ohm(F) 1/4W  
VRD-B12EF102J Resistor 1.0k ohm  
VRD-B12EF304J Resistor 300k ohm  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/2W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
1/4W  
VRD-B12EF473J Resistor  
VRD-B12EF101J Resistor  
VRD-B12EF303J Resistor  
47k ohm  
100 ohm  
30k ohm  
VRD-B12EF112J Resistor 1.1k ohm  
VRD-B12EF203J Resistor 20k ohm  
VRD-B12EF332J Resistor 3.3k ohm  
VRD-B12EF473J Resistor  
VRD-B12EF471J Resistor  
VRD-B12HF390J Resistor  
47k ohm  
470 ohm  
39 ohm  
R83-84  
R93-101 VRD-B12EF153J Resistor  
15k ohm  
R200  
R201  
R300  
(J2)  
(J3)  
RY1  
RY3-4  
SP1  
T1  
VRD-B12EF472J Resistor 4.7k ohm  
VRD-B12EF682J Resistor 6.8k ohm  
VRD-B12EF105J Resistor 1.0M ohm  
VRD-B12EF822J Resistor 8.2k ohm  
VRD-B12EF363J Resistor  
36k ohm  
RRLY-A078DRE0 Relay (OJ-SH-118LM)  
RRLY-A059DRE0 Relay (VS14MB-NR-SH6)  
RALM-A003DRE0 Buzzer (PS3025P02)  
RTRNPA080DRE0 Touch control transformer  
RTRN-A060DRE0 Current transformer  
RH-VZA010DRE0 Varistor (TNR15G471K)  
VHEHZ12C1//-1 Zener diode (HZ12C1)  
VHEHZ4C3///-1 Zener diode (HZ4C-3)  
FPNLCB159WRK0 Control panel frame with key unit assembly  
FUNTKA775WRE0 Key unit  
HDECAA195WRP0 Decoration metal fittings  
PCUSUA451WRP0 Cushion  
CT1-2  
VRS1  
ZD1  
ZD2  
3- 2  
3- 2-1  
3- 2-2  
3- 2-3  
3- 3  
3- 4  
3- 5  
3- 6  
LANGTA243WRW0 Control panel mounting angle  
XEPSD30P10XS0 Screw; control unit mounting  
XEPSD40P12000 Screw; control panel mounting angle mounting  
XFTSD40P08K00 Screw; decoration panel mounting for earth  
35  
R-2397  
Note: The parts marked "" may cause undue microwave exposure.  
The parts marked "*" are used in voltage more than 250V.  
REF. NO.  
PART NO.  
DESCRIPTION  
Q'TY CODE  
3- 7  
PCUSGA380WRP0 Cushion  
1
AA  
OVEN PARTS  
4- 1  
4- 2  
4- 3  
PCUSUA265WRP0 Cushion  
PDUC-A565WRW0 Exhaust duct  
FOVN-A336WRY0 Oven cavity  
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
2
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AA  
AZ  
BR  
AE  
AC  
AC  
AC  
AB  
AB  
AP  
AC  
AN  
AN  
BD  
AT  
AY  
AE  
AD  
AD  
AF  
AH  
AZ  
AF  
AE  
AG  
AC  
AC  
AP  
AD  
AF  
AB  
AH  
AD  
AL  
AV  
AR  
AE  
AE  
AD  
AG  
AG  
AB  
AB  
AC  
AB  
AE  
AB  
AA  
AF  
AC  
AD  
AC  
AC  
AA  
4- 4  
4- 5  
4- 6  
4- 7  
4- 8  
4- 9  
4-10  
4-11  
4-12  
4-13  
4-14  
4-15  
4-16  
4-17  
4-18  
4-19  
4-20  
4-21  
4-22  
4-23  
4-24  
4-25  
4-26  
4-27  
4-28  
4-29  
4-30  
4-31  
4-32  
4-33  
4-34  
4-35  
4-36  
4-37  
4-38  
4-39  
PFILWA053WRP0 Oven light screen  
MLEVPA153WRF0 Switch lever A  
MLEVPA154WRF0 Switch lever B  
MLEVPA155WRF0 Switch lever C  
MSPRCA075WRE0 Switch spring A  
MSPRCA076WRE0 Switch spring B  
PHOK-A081WRF0 Latch hook  
PZETEA047WRP0 Switch insulator  
PDUC-A566WRF0 Mg air guide  
PDUC-A567WRF0 Mg air guide cover  
FGLSPA021WRY0 Ceramic shelf  
FPLT-A006WRY0 Stirrer antenna upper assembly  
FPLT-A005WRY0 Stirrer antenna lower assembly  
LANGKA762WRP0 Partition angle R  
LANGQA370WRP0 Oven lamp mounting plate  
LBNDKA075WRP0 Capacitor holder  
PGIDHA054WRW0 Water-proof cover  
NSFTPA031WRF0 Antenna motor shaft  
PCOVPA310WRF0 Splash cover  
PCUSGA405WRP0 Cushion  
PCUSGA409WRP0 Cushion  
PCUSUA413WRP0 Cushion  
PCUSUA415WRP0 Cushion  
PCUSUA416WRP0 Cushion  
PDUC-A607WRW0 Mg exhaust duct  
PCUSUA414WRP0 Cushion  
LANGQA251WRW0 Noise filter angle  
LANGQ0382WRM0 Earth angle  
LANGFA172WRP0 Chassis support  
LBSHCA012WRE0 Cord bushing  
PCUSGA441WRP0 Cushion  
FFIL-A003WRK0 Air intake filter assembly  
HDECEA001WRP0 Decoration sash  
HDECQA146WRM0 Corner cap left  
HDECQA147WRM0 Corner cap right  
LANGKA679WRM0 Fixing angle s  
MHNG-A215WRM0 Upper oven hinge  
MHNG-A216WRM0 Lower oven hinge  
PCUSGA275WRP0 BLM cushion  
PCUSUA417WRP0 Cushion  
MSPRCA101WRE0 Switch spring C  
PCUSUA458WRP0 V/P cushion  
LANGQA440WRM0 Earth angle  
PCUSGA289WRP0 Cushion  
4-40  
4-41  
4-42  
4-43  
4-44  
4-45  
4-46  
4-47  
4-48  
4-49  
4-50  
4-51  
4-52  
4-53  
4-54  
PCUSUA268WRP0 Cushion  
PZETEA073WRP0 Insulator sheet B  
PCUSUA448WRP0 Cushion  
PCUSGA442WRP0 Cushion  
PCUSGA443WRP0 Cushion  
PCUSUA447WRP0 Cushion  
PCUSGA045WRP0 Cushion  
DOOR PARTS  
5
DDORFA746WRK0 Door assembly  
FDORFA289WRT0 Door panel assembly  
GCOVAA242WRY0 Door case  
FHNDMA011WRY0 Door release lever assembly  
GCOVHA350WRF0 Choke cover  
JHNDPA169WRM0 Door handle  
LANGKA766WRP0 Outside window fixing plate  
PCUSGA430WRP0 Cushion  
PGLSPA457WRE0 Door glass  
PPACGA142WRP0 Door case packing  
PSHEPA520WRE0 Sealer film  
PSPA-A102WRE0 Door screen spacer  
XFPSD40P08K00 Screw : 4mm x 8mm  
1
1
1
1
1
1
2
2
1
2
1
2
3
BP  
BH  
BD  
AP  
AR  
AU  
AF  
AM  
AV  
AF  
AH  
AE  
AA  
5- 1  
5- 2  
5- 3  
5- 4  
5- 5  
5- 6  
5- 7  
5- 8  
5- 9  
5-10  
5-11  
5-12  
36  
R-2397  
Note: The parts marked "" may cause undue microwave exposure.  
The parts marked "*" are used in voltage more than 250V.  
REF. NO.  
PART NO.  
DESCRIPTION  
Q'TY CODE  
5-13  
5-14  
5-15  
5-16  
5-17  
5-18  
5-19  
5-20  
5-21  
XHTSD40P08RV0 Screw : 4mm x 8mm  
FANGKA200WRY0 Latch fixing angle  
FLEVFA019WRY0 Joint lever  
LSTPCA002WRM0 Latch head  
MLEVPA220WRF0 Head lever  
MSPRCA097WRE0 Latch spring  
HBDGCA069WRE0 Door badge  
XEPSD40P20000 Screw : 4mm x 20mm  
4
1
1
2
1
1
1
2
2
AA  
AQ  
AP  
AM  
AM  
AG  
AF  
AB  
AA  
XWSSD40-10000 Washer : 4mm x 1mm  
MISCELLANEOUS  
6- 1  
6- 2  
6- 3  
6- 4  
6- 5  
6- 6  
6- 7  
6- 8  
6- 9  
6-10  
6-11  
6-12  
6-13  
6-14  
6-15  
6-16  
6-17  
6-18  
6-19  
TINSMA004WRR0  
Instruction manual (German, French, Dutch, Italian, Spanish)  
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
AH  
AC  
AG  
BB  
AE  
AB  
AB  
AB  
AF  
AC  
AC  
AB  
AH  
AC  
AC  
AD  
AC  
AA  
AB  
TLABHA029WRR0 Menu sticker  
FW-VZB402WRE0 Switch harness  
FW-VZB585WRE0 Main wire harness  
LHLDWA021WRE0 Harness lifter  
TCAUHA083WRR0 Belgium label  
LHLDWA040WRE0 Wire holder A  
TLABSA054WRR0 Fuse label  
PTUB-A042WRE0 Tube  
TCAUHA082WRR0 Caution label  
LHLDWA043WRE0 Wire saddle S  
TLABSA069WRR0 Fuse label F6.3A  
TSPCNC161WRR0 Rating label  
TCAUHA176WRR0 Caution label  
TLABSA064WRR0 A017 label  
TLABSA066WRR0 Equipotential label  
LHLDWA047WRE0 Space clip  
LHLDWQ004YBE0 Purse lock L  
LHLDWA023WRE0 Wire saddle  
SCRE, NUTS AND WASHERS  
7- 1  
7- 2  
7- 3  
7- 4  
7- 5  
7- 6  
7- 7  
7- 8  
7- 9  
7-10  
7-11  
7-12  
7-13  
7-14  
7-15  
7-16  
7-17  
7-18  
7-19  
7-20  
7-21  
7-22  
7-23  
7-24  
7-25  
7-26  
7-27  
7-28  
7-29  
7-30  
7-31  
7-32  
7-33  
7-34  
7-35  
7-36  
7-37  
7-38  
XCBWW30P08000 Screw : 3mm x 8mm  
XFPSD50P12KS0 Screw : 5mm x 12mm  
XFTSD40P10RV0 Screw : 4mm x 10mm  
XOTSD40P06000 Screw : 4mm x 6mm  
XFTSD40P12000 Screw : 4mm x 12mm  
XWSSD40-10000 Washer : 4mm x 1mm  
LX-WZA035WRE0 Special washer  
XOTWW40P08000 Screw : 4mm x 8mm  
LX-CZA038WRE0 Special screw  
4
4
1
2
1
1
1
4
2
4
1
1
3
2
2
8
8
13  
1
3
2
2
1
3
2
4
2
1
2
2
1
4
8
1
1
2
6
2
AB  
AB  
AB  
AA  
AA  
AA  
AB  
AB  
AA  
AB  
AC  
AB  
AB  
AB  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AA  
AB  
AA  
AA  
AA  
AA  
AA  
AC  
AB  
AA  
AA  
AA  
AA  
AA  
PSPA-A101WRE0 Washer  
XTBWW40P30000 Screw : 4mm x 30mm  
XCBWW30P12000 Screw : 3mm x 12mm  
XEPSD30P12XS0 Screw : 3mm x 12mm  
LX-CZA057WRE0 Special screw  
XHPSD40P05000 Screw : 4mm x 5mm  
XHTSD40P08RV0 Screw : 4mm x 8mm  
XOTSD40P12000 Screw : 4mm x 12mm  
XOTWW40P10000 Screw : 4mm x 10mm  
XOTWW40P20000 Screw : 4mm x 20mm  
XCPSD30P10000 Screw : 3mm x 10mm  
XFPSD40P08K00 Screw : 4mm x 8mm  
XOTSD40P12RV0 Screw : 4mm x 12mm  
LX-BZA064WRE0 Special screw  
XCPSD30P06000 Screw : 3mm x 6mm  
XOTSD40P10000 Screw : 4mm x 10mm  
XBPUW40P04000 Screw : 4mm x 4mm  
XBTUW40P10000 Screw : 4mm x 10mm  
XFTSD40P08000 Screw : 4mm x 8mm  
XTPSD40P08000 Screw : 4mm x 8mm  
XWWSD50-06000 Washer : 5mm x 0.6mm  
XONSC40P10000 Screw : 4mm x 10mm  
LX-BZA110WRE0 Special screw  
XHPSD50P08000 Screw : 5mm x 8mm  
XBPSD30P28KS0 Screw : 3mm x 28mm  
XNESD30-24000 Nut : 3mm x 2.4mm  
XJPSD40P10000 Screw : 4mm x 10mm  
XOTSC40P12000 Screw : 4mm x 12mm  
LX-EZA004WRE0 Special screw  
37  
R-2397  
HOW TO ORDER REPLACEMENT PARTS  
To have your order filled promptly and correctly, please furnish the following information.  
1. MODEL NUMBER  
3. PART NO.  
2. REF. NO.  
4.DESCRIPTION  
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
1-28 RFIL-A004WRE0  
1-28 RFIL-A004WRE0  
POWER SUPPLY CORD  
These ferrite clamps are included in High voltage rectifire assembly  
1-29 RFIL-A002WRE0  
6-2 PTUB-A042WRE0  
G
G
H
H
6
4
5
2
1
3
38  
R-2397  
6
4
5
2
1
3
6-14  
OVEN AND CABINET PARTS  
2-5-2  
2-6  
7-31  
2-5-1  
A
B
C
D
E
F
A
B
C
D
E
F
7-37  
2-5  
4-20  
7-14  
6-6  
7- 8  
7-29  
6-14  
6-10  
7-18  
6-13  
7-8  
2-7  
7-1  
7-23  
7-14  
7-11  
4-43  
2-4  
7-18  
1-7  
4-26  
7-18  
7-12  
4-39  
4-24  
1-9  
4-2  
4-25  
7-5  
7-7  
7-6  
4-53  
4-46  
4-49  
4-27  
7-1  
7-1  
1-6  
4-33  
4-48  
7-19  
1-1  
1-23  
7-17  
1-18  
7-22  
7-18  
6-18  
7-24  
4-13  
1-2  
4-54  
7-16  
6-16  
1-5  
7-13  
7-28  
4-27  
1-16  
7-15  
4-21  
1-17  
6-17  
6-11  
1-24  
7-33  
4-18  
7-25  
4-29  
4-12  
4-28  
7-36  
4-26  
7-4  
7-32  
1-22  
7-18 7-20  
2 A1  
x-2  
A
6-19  
A
1
1-23  
A2  
4-27  
4-40  
7-33  
4-32  
7-18  
7-36  
1-5  
4-3  
1-20  
6-8  
4-4  
6-12  
4-1  
4-50  
1-20  
7-25  
4-37  
1-15  
4-19  
7-32  
4-42 To conner of lower  
wavegide  
7-16  
4-15  
1-8  
4-41  
7-26  
4-17  
7-24  
1-26  
7-10  
1-15  
7-16  
7-26  
4-21  
7-10  
7-16  
4-8  
1-19  
4-16  
7-1  
7-38  
7-35  
4-36  
1-27  
1-17  
7-15  
4-9  
7-2  
7-30  
4-38  
4-23  
1-11  
4-34  
7-2  
7-21  
6-15  
4-5  
4-6  
4-22  
7-30  
1-27  
1-21  
1-25  
4-11  
4-44  
1-13  
G
7-21  
7-3  
G
7-27  
1-4  
1-12  
7-34  
4-9  
4-10  
1-10  
4-7  
4-31  
1-14  
4-30  
6-5  
4-51  
4-47  
2-1  
4-52  
4-14  
H
H
7-4  
4-35  
2-3  
x2  
7-17  
7-17  
4-45  
7-16  
2-2  
x2  
6
4
5
2
1
3
39  
R-2397  
6
4
5
2
1
3
3-7  
CONTROL PANEL PARTS  
3-2-3  
3-1  
A
B
C
D
E
F
A
B
C
D
E
F
3-2  
3-2-2  
3-5  
3-4  
3-6  
3-3  
1-3  
3-2-1  
DOOR PARTS  
5-4  
5-11  
5-10  
5-11  
5-14  
5-21  
5-1  
5
5-20  
5-12  
5-15  
5-18  
5-8  
5-6  
5-16  
5-13  
5-17  
5-9  
5-7  
G
G
5-6  
5-13  
5-2  
5-19  
5-3  
H
H
5-5  
6
4
5
2
1
3
40  
R-2397  
PACKING ADD KIT  
* CPADBA203WRK0  
DOOR PROTECTION SHEET  
* SPADPA552WRE0  
WRAP COVER  
DOOR PAD  
* SPADF0341WRE0  
TRAY HOLDER  
* SPADPA551WRE0  
PACKING CASE  
* SPAKCC551WRE0  
* Not replaceable items.  
PRINTING MATER  
INSTRUCTION BOOK  
41  
R-2397  
'97 SHARP CORP. (5U0.10E) Printed in Japan  

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