LG Electronics Microwave Oven MV1825SW User Manual

MICROWAVE OVEN  
SERVICE MANUAL  
MODEL: LMV1825SB  
LMV1825SW  
LMV1825SBQ  
CAUTION  
BEFORE SERVICING THE UNIT, READ THE  
SAFETY PRECAUTIONS IN THIS MANUAL.  
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FOREWORD  
Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing  
yourself to the Microwave Energy normally contained within the oven cavity.  
TABLE OF CONTENTS  
(Page)  
SAFETY PRECAUTIONS ......................................................................................................... Inside front page  
SPECIFICATIONS.......................................................................................................................................... 1-1  
CAUTIONS ..................................................................................................................................................... 2-1  
INSTALLATION .............................................................................................................................................. 3-1  
OPERATING INSTRUCTIONS....................................................................................................................... 4-1  
CONTROL PANEL ................................................................................................................................. 4-1  
CONTROL PANEL INSTRUCTIONS ..................................................................................................... 4-2  
OVERALL CIRCUIT DIAGRAM...................................................................................................................... 5-1  
SCHEMATIC DIAGRAM......................................................................................................................... 5-1  
MATRIX CIRCUIT FOR TOUCH KEY BOARD ...................................................................................... 5-2  
GENERAL INFORMATION FOR SERVICE................................................................................................... 6-1  
GENERAL PRECAUTIONS IN USE ...................................................................................................... 6-1  
TRIAL OPERATION ............................................................................................................................... 6-1  
FEATURES AND SPECIFICATIONS FEATURES................................................................................. 6-1  
SERVICE INFORMATION ............................................................................................................................. 7-1  
PRECAUTIONS AND REPAIR SERVICE TIPS..................................................................................... 7-1  
MICROWAVE LEAKAGE TEST............................................................................................................. 7-2  
POWER OUTPUT MEASUREMENT ..................................................................................................... 7-3  
DISASSEMBLY INSTRUCTIONS .......................................................................................................... 7-4  
INTERLOCK SYSTEM .......................................................................................................................... 7-12  
INTERLOCK CONTINUITY TEST.......................................................................................................... 7-14  
TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING................................................ 7-15  
A. TEST PROCEDURES................................................................................................................ 7-15  
B. CHECKOUT PROCEDURES..................................................................................................... 7-18  
C. TROUBLE SHOOTING.............................................................................................................. 7-21  
EXPLODED VIEW.......................................................................................................................................... 8-1  
REPLACEMENT PARTS LIST............................................................................................................... 8-8  
SCHEMATIC DIAGRAM OF PCB .......................................................................................................... 8-14  
PRINTED CIRCUIT BOARD .................................................................................................................. 8-15  
PCB PARTS LIST................................................................................................................................... 8-16  
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SPECIFICATIONS  
Rated Power Consumption..................................................1,500W maximum (Microwave oven+Cook top lamps+Ventilation fan)  
Microwave Output.................................................................1000W (IEC 60705)  
Adjustable 100W through 1000W, 10 steps  
Frequency.............................................................................2,450 MHz 50 MHz  
Power Supply........................................................................120 VAC, 60 Hz  
Rated Current .......................................................................13 Amp. (Microwave oven+Cook top lamps+Ventilation fan)  
Magnetron Cooling...............................................................Forced Air Cooling  
Rectification...........................................................................Rectification Voltage Double Half-Wave  
Door Sealing .........................................................................Choke System  
Safety Devices......................................................................Magnetron Thermal Fuse:  
Open at 109°C 4°C  
Oven Cavity Thermostat:  
Open at 110°C 5°C  
Fuse(20A)  
Primary Interlock Switch  
Secondary Interlock Switch  
Interlock Monitor  
Magnetron.............................................................................2M248  
High Voltage Capacitor ........................................................Capacitor: 1.0µF, 2.1 KV AC  
High Voltage Diode...............................................................Diode; 350mA, 9.0 KV  
Cook top Lamp .....................................................................125 V, 30 W  
Cavity Lamp..........................................................................125 V, 30 W  
Timer .....................................................................................Digital, up to 99 mim. 99 sec. (in each cooking stage)  
Tray .......................................................................................Tempered Safety Glass  
Overall Dimensions ..............................................................2915/16(W)x167/16(D)x155/8(H)  
Oven Cavity Size .................................................................223/8(W)x10(D)x1419/32(H)  
Effective Capacity of Oven Cavity .......................................1.8 Cu.ft.  
Accessories...........................................................................Owner’s Manual & Cooking Guide, Installation Manual,  
Exhaust Adapter, Exhaust Damper, Mounting Kit and Two Filters,  
Rotating Ring Assembly, Metal Rack, Defrosting Rack.  
1-1  
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CAUTIONS  
Unlike other appliances, the microwave oven is  
MICROWAVE RADIATION  
high-voltage and high-current equipment.  
Though it is free from danger in ordinary use,  
extreme care should be taken during repair.  
Personnel should not be exposed to the  
microwave energy which may radiate from the  
magnetron or other microwave generating  
device if it is improperly used or connection.  
All input and output microwave connections,  
waveguide, flange, and gasket must be secure.  
Never operate the device without a microwave  
energy absorbing load attached.  
• DO NOT operate on a 2-wire extension cord during  
repair and use.  
• NEVER TOUCH any oven components or wiring during  
operation.  
• BEFORE TOUCHING any parts of the oven, always  
remove the power plug from the outlet.  
• For about 30 seconds after the oven stops, an electric  
charge remains in the high voltage capacitor. When  
replacing or checking, you must discharge the high  
voltage capacitor by shorting across the two terminals  
with an insulated screwdriver.  
Never look into an open waveguide or antenna  
while the device is energized.  
• Proper operation of the microwave oven requires that  
the magnetron be assembled to the waveguide and  
cavity. Never operate the magnetron unless it is  
properly installed.  
• Be sure that the magnetron gasket is properly  
installed around the dome of the tube whenever  
installing the magnetron.  
ANTENNA  
Gasket  
COOLING FIN  
FILAMENT  
TERMINALS  
MAGNETRON  
CHASSIS GROUND  
Remove your watch whenever working close to or  
replacing the Magnetron.  
MAGNETRON  
• DO NOT touch any parts of the control panel circuit. A  
resulting static electric discharge may damage this  
P.C.B.  
• NEVER operate the oven with no load.  
• NEVER injure the door seal and front plate of the oven  
cavity.  
• NEVER put iron tools on the magnetron.  
• NEVER put anything into the latch hole and the interlock  
switches area.  
THE OVEN IS TO BE SERVICED ONLY  
BY PROPERLY QUALIFIED SERVICE  
PERSONNEL.  
2-1  
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INSTALLATION  
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.  
PRECAUTIONS ON INSTALLATION  
A. Plug the power supply cord into a 120V AC, 60Hz,  
single-phase power source with a capacity of 15A  
or 20A.  
B. Avoid placing the unit in a location where there is  
direct heat or splashing water.  
C. Install the unit on the mounting plate firmly.  
D. Place the unit as far away as possible from TV,  
radio, etc. to prevent interference.  
GROUNDING INSTRUCTIONS  
For personal safety, this appliance must be fully  
grounded at all times.  
In the event of an electrical short circuit, grounding  
reduces the risk of electrical shock.  
The plug must be plugged into an outlet that is  
properly installed and grounded.  
CAUTION  
This unit is equipped with a 3-prong plug for your  
safety. If the wall outlet is a grounded 3-hole type,  
the unit will be grounded automatically.  
Plug with Ground  
Prong  
Properly Polarized  
and Grounded  
Outlet  
WARNING  
Improper use of the grounding plug can result in a  
risk of electric shock.  
Do not, under any circumstances, cut or remove the  
third ground prong from the power cord plug.  
3-1  
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OPERATING INSTRUCTIONS  
CONTROL PANEL  
1
4
2
3
5
6
7
9
8
10  
11  
13  
12  
14  
16  
15  
19  
18  
17  
20  
22  
21  
25  
24  
23  
4-1  
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CONTROL PANEL INSTRUCTIONS  
1. DISPLAY: The Display includes a clock and indicators to  
tell you time of day, cooking time settings and cooking  
functions selected.  
14. STOP/CLEAR: Touch this pad to stop the oven or to  
clear all entries.  
15. CLOCK: Touch this pad to enter the time of day.  
2. MORE: Touch this pad to add ten seconds of cooking  
time each time you press it.  
16. START: Touch this pad to start a function. If you open  
the door after oven begins to cook, START again.  
3. LESS: Touch this pad to subtract ten seconds of cooking  
time each time you press it.  
17. CUSTOM SET: Touch this pad to change the oven’s  
default settings for sound, clock, display speed and  
defrost weight.  
4. AUTO DEFROST: Meat, poultry, fish. Touch this pad to  
select food type and defrost food by weight.  
18. HOLD WARM: Touch this pad to keep hot, cooked foods  
warm in your microwave oven for up to 99 minutes 99  
seconds.  
5. POPCORN: Touch this pad when popping popcorn in  
your microwave oven. The oven’s sensor will tell the oven  
how long to cook depending on the amount of humidity it  
detects from the popcorn.  
19. EZ-ON: Touch this pad to set and start quickly at 100%  
power level.  
6. POTATO: Touch this pad to cook potatoes. The oven’s  
sensor will tell the oven how long to cook depending on  
the amount of humidity it detects from the potato.  
20. CUSTOM COOK: Touch this pad to recall one cooking  
instruction previously programmed into memory.  
21. LIGHT TIMER: Touch this pad to set the light timer.  
7. VEGETABLE: Touch this pad to reheat vegetables. The  
oven’s sensor will tell the oven how long to cook  
depending on the amount of humidity it detects from the  
vegetables.  
22. KITCHEN TIMER: Touch this pad to set the kitchen  
timer.  
23. TURNTABLE ON-OFF: Touch this pad to turn off the  
8. PIZZA: Touch this pad to cook pizza without selecting  
cooking times and power levels.  
turntable. OFF will appear in the display.  
24. VENT HI-LOW-OFF: Touch this pad to turn the fan on or  
9. COOK: Touch this pad to cook frozen entree, casserole,  
and rice. The oven’s sensor will tell the oven how long to  
cook depending on the amount of humidity coming from  
the food.  
off.  
25. LIGHT HI-LOW-OFF: Touch this pad to turn on the  
cooktop/countertop light.  
10. REHEAT: Touch this pad to reheat casserole, dinner  
plate, and soup/sauce. The oven’s sensor will tell the  
oven how long to cook depending on the amount of  
humidity coming from the food.  
WARNING:  
DO NOT RUN THE OVEN EMPTY WITHOUT FOOD  
IN IT.  
11. NUMBER: Touch number pads to enter cooking time,  
power level, quantities, or weights.  
12. POWER LEVEL: Touch this pad to select a cooking  
power level.  
13. TIME COOK: Touch this pad to set a cooking time.  
4-2  
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OVERALL CIRCUIT DIAGRAM  
SCHEMATIC DIAGRAM  
5-1  
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MATRIX CIRCUIT FOR TOUCH KEY BOARD  
2
1
3
5
4
6
7
VENT  
HI/LO/OFF  
TIME  
COOK  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
5
6
0
1
2
3
4
8
LIGHT  
HI/LO/OFF  
CUSTOM  
SET  
AUTO  
DEFROST  
9
KITCHEN  
TIMER  
LESS  
CLOCK  
Ez-On  
N.C  
7
8
10  
11  
12  
13  
LIGHT  
TIMER  
CUSTOM  
COOK  
POWER  
LEVEL  
TURNTABLE  
ON/OFF  
STOP  
CLEAR  
HOLD  
WARM  
START  
9
SENSOR  
PIZZA  
SENSOR SENSOR  
POTATO POPCORN  
SENSOR  
VEGETABLE REHEAT  
SENSOR SENSOR  
COOK  
MORE  
5-2  
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GENERAL INFORMATION FOR SERVICE  
FEATURES AND SPECIFICATIONS  
FEATURES  
GENERAL PRECAUTIONS IN USE  
A. Never operate the unit when it is empty.  
Operating the oven with no load may shorten the  
life of the magnetron. Whenever cooking dry foods  
(dried fish, bread, etc.) or a small amount of food,  
be sure to put a glass of water into the cooking  
compartment. The glass turntable may become hot  
after operating, be careful when touching it.  
B. Aluminum foil should be avoided because it will  
disrupt cooking and may cause arcing. However,  
small pieces may be used to cover some parts of  
food to slow the cooking. Any aluminum foil used  
should never be closer than 2.5 cm to any side wall  
of the oven.  
A. The safety systems incorporated in this model are:  
(1) Primary interlock switch  
(2) Secondary interlock switch  
(3) Interlock monitor switch  
(4) Choke system  
(5) Magnetron thermal fuse  
(6) Oven cavity thermostat  
(Note: This thermostat located on the oven  
cavity will open and stop the unit from operation  
only if a high temperature is reached, such as,  
a fire created by overcooking food.)  
B. Any one of 10 power output levels ranging 100W to  
1000W can be selected by the touch control and  
electronic computer system.  
TRIAL OPERATION  
After installation, the following sequences and results  
should be checked carefully.  
A. Put a container filled with water (about 1 liter) into  
the oven, and close the door tightly.  
B. Set cooking time for 10 minutes by touching “1”  
and then “0” three times. “1, 0, 0, 0” appears in  
the display window.  
C. Touch the START key.  
Make sure the cavity light comes on. The unit will  
begin cooking and the display window will show the  
time counting down by seconds.  
D. After about 5 minutes, make sure the primary  
interlock switch, the secondary interlock switch and  
the interlock monitor switch operate properly by  
opening and closing the door several times. Touch  
the START key each time the door is closed.  
E. Continue operating the unit. Four long beep sound  
signal is heard when the time is up. The unit will  
shut off automatically.  
F. Confirm the water is hot.  
G. Finally, measure the output power according to  
“POWER OUTPUT MEASUREMENT” on  
page 7-3.  
6-1  
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SERVICE INFORMATION  
PRECAUTIONS AND REPAIR SERVICE TIPS  
PRELIMINARY  
(3) Do not operate the unit until it is completely  
repaired, if any of the following conditions exist.  
The unit must not be operated.  
A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME  
CIRCUITS OF THIS UNIT REPAIRS SHOULD BE  
CARRIED OUT WITH GREAT CARE.  
(a) The door does not close firmly.  
(b) The hinge is broken.  
(c) The door seal is damaged.  
(d) The door is bent or warped, or there is any  
other visible damage on the unit that may  
cause microwave energy leakage.  
The filament leads of magnetron carry High  
Voltage with respect to ground. Extreme caution  
must be exercised. Never plug the unit into a  
power source to determine which component is  
defective in high voltage section.  
NOTE: Always keep the seal clean.  
(e) Make sure that there are no defective parts  
in the interlock mechanism.  
(f) Make sure that there are no detective parts  
in the microwave generating and transmission  
assembly (especially waveguide).  
B. TO AVOID POSSIBLE EXPOSURE TO  
MICROWAVE ENERGY LEAKAGE, THE  
FOLLOWING PRECAUTIONS MUST BE TAKEN  
BEFORE SERVICING.  
(1) Before the power is applied:  
(a) Make sure the primary interlock switch, the  
secondary interlock switch and the interlock  
monitor switch operate properly by opening  
and closing the door several by opening and  
closing the door several times.  
(b) Make sure the perforated screen and the  
dielectric choke of the door are correctly and  
firmly mounted.  
(4) The following items should be checked after the  
unit is repaired:  
(a) The interlock monitor switch is connected  
correctly and firmly.  
(b) The magnetron gasket is properly positioned  
and mounted.  
(c) The waveguide and the oven cavity are intact.  
(no microwave energy leakage)  
(d) The door can be properly closed and the  
safety switches work properly.  
(e) The unit must stop when the door is opened or  
the time is up.  
(2) After power is applied:  
(a) Make sure the interlock switch mechanism  
is operating properly by opening and closing  
the door.  
(b) Check microwave energy leakage must bebelow  
the limit of 5 mW/cm2.  
The unit must not be operated with any of the above  
components removed or by-passed.  
(All service adjustments should be made for  
minimum microwave energy leakage  
readings).  
7-1  
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MICROWAVE LEAKAGE TEST  
MEASURING MICROWAVE ENERGY  
LEAKAGE  
CAUTIONS  
• Be sure to check microwave leakage prior to  
servicing the oven if the oven is operative prior to  
servicing.  
• Pour 275±15cc of 20±5°C(68±9°F) water in a beaker  
which is graduated to 600 cc, and place the beaker  
on the center of the turntable.  
• Set the energy leakage monitor to 2,450 MHz and  
use it following the manufacturer's recommended  
test procedure to assure correct result.  
• When measuring the leakage, always use the 2-inch  
(5cm) spacer supplied with the probe.  
• Operate the oven at its maximum output.  
• Measure the microwave radiation using an  
electromagnetic radiation monitor by holding the  
probe perpendicular to the surface being measured.  
• The service personnel should inform the  
manufacture importer, or assembler of any certified  
oven unit found to have a microwave emission level  
in excess of 5 mW/cm2 and should repair any unit  
found to have excessive emission levels, at no cost to  
the owner, and should ascertain the cause of the  
excessive leakage. The service personnel should  
instruct the owner not to use the unit until the oven has  
been brought into compliance.  
• If the oven operates with the door open, the service  
personnel should:  
- Tell the user not to operate the oven.  
- Contact the manufacturer and CDRH  
(Center for Devices and Radiological Health)  
immediately.  
Move probe along shaded area.  
NOTE: Address on CDRH  
Probe scanning speed  
Less than 2.5 cm/sec. ( 1 in/sec)  
Office of Compliance(HFZ-312)  
Center for Devices and Radiological  
Healthe 1390, Piccard Drive,  
Rockville. MD 20850  
• The service personnel should check all surface and  
vent openings for microwave leakage.  
• Check for microwave leakage after every servicing. The  
power density of the microwave radiation leakage  
emitted by the microwave oven should not exceed  
4 mW/cm2. Always start measuring of an unknown field  
to assure safety for operating personnel from radiation  
leakage.  
EQUIPMENT  
• TESTER (VOLTS-DC, AC, Ohmmeter)  
• Microwave survey meter  
- Holaday HI-1500  
HI-1501  
- Narda 8100  
8200  
• 600 cc non conductive material beaker (glass or  
1
plastic), inside diameter: approx. 8.5 cm (3 /2 in.)  
• Glass thermometer: 100°C or 212°F (1 deg scale)  
7-2  
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MEASUREMENT WITH THE OUTER CASE  
REMOVED  
NOTE WHEN MEASURING  
(1) Do not exceed meter full scale deflection.  
(2) The test probe must be moved no faster than  
1 inch/sec (2.5cm/sec) along the shaded area,  
otherwise a false reading may result.  
(3) The test probe must be held by the grip portion of  
the handle. A false reading may result if the  
operator’s hand is between the handle and the  
probe.  
(1) When you replace the magnetron, measure for  
microwave energy leakage before the outer case  
is installed and after all necessary components  
are replaced or adjusted. Special care should be  
taken in measuring the following parts.  
- Around the magnetron  
- The waveguide  
(4) When testing near a corner of the door, keep  
the probe perpendicular to the surface being  
tested. (Hold vertically when testing the top and  
bottom, and horizontally along the side.)  
WARNING: AVOID CONTACTING ANY HIGH  
VOLTAGE PARTS.  
MEASUREMENT WITH A FULLY  
ASSEMBLED OVEN  
(1) After all components, including the outer  
panels, are fully assembled, measure for  
microwave energy leakage around the door  
viewing window, the exhaust opening and air  
inlet openings.  
RECORD KEEPING AND NOTIFICATION  
AFTER MEASUREMENT  
(1) After adjustment and repair of any microwave  
energy interruption or microwave energy blocking  
device, record the measured values for future  
reference. Also enter the information on the  
service invoice.  
(2) Should the microwave energy leakage not be  
more than 2 mW/cm2 after determining that all  
parts are in good condition, functioning properly  
and genuine replacement parts which are listed in  
this manual have been used.  
(2) Microwave energy leakage must not exceed the  
values prescribed below.  
NOTES:  
Leakage with the outer panels removed less than  
5 mW/cm2. Leakage for a fully assembled oven  
(“Before the latch switch (primary) is interrupted”)  
with the door in a slightly opened position - less  
than 2 mW/cm2.  
(3) At least once a year, have the electromagnetic  
energy leakage monitor checked for calibration  
by its manufacturer.  
POWER OUTPUT MEASUREMENT  
(1) Microwave power output measurement is made with  
the microwave oven supplied at its rated voltage and  
operated at its maximum microwave power setting  
with a load of (1000±5) g of potable water.  
(2) The water is contained in a cylindrical borosilicate  
glass vessel having a maximum material thickness of  
1/8” (3 mm) and an outside diameter of  
(6) The microwave power output P in watts is  
calculated from the following formula :  
4187 x (T)  
P =  
T
is measured while the microwave generator is  
operating at full power. Magnetron filament heat-up  
time is not included. (about 3 sec)  
approximately 7.6” (190mm).  
(3) The oven and the empty vessel are at ambient  
temperature prior to the start of the test.  
(4) The initial temperature (T1) of the water is (10±2)°C  
(50°F) It is measured immediately before the water is  
added to the vessel. After addition of the water to the  
vessel, the load is immediately placed on the center  
of the turntable which is in the lowest position and the  
microwave power switched on.  
(7) The water is stirred to equalize temperature  
throughout the vessel, prior to measuring the final  
water temperature.  
(8) Stirring devices and measuring instruments are  
selected in order to minimize addition or removal of  
heat.  
WATER LOAD  
(5) The time T for the temperature of the water to rise by  
a value T of (10±2)°K is measured, where T is the  
time in seconds and T is the temperature rise. The  
initial and final water temperatures are selected so  
that the maximum difference between the final water  
temperature and the ambient temperature is 5°K.  
TURNTABLE  
7-3  
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DISASSEMBLY INSTRUCTIONS  
(4) Remove 3 screws securing the circuit board.  
IMPORTANT NOTES:  
UNIT MUST BE DISCONNECTED FROM ELEC-  
TRICAL OUTLET WHEN MAKING REPAIRS, RE-  
PLACEMENTS, ADJUSTMENTS AND CONTIN-  
UITY CHECKS. WAIT AT LEAST ONE MINUTE,  
UNTIL THE HIGH VOLTAGE CAPACITOR IN THE  
HIGH VOLTAGE POWER SUPPLY HAS FULLY  
DISCHARGED.  
THE CAPACITOR SHOULD BE DISCHARGED BY  
USING INSULATED WIRE - I.E. TEST PROBE  
CONNECTED TO 10K-OHM RESISTOR IN SERIES  
TO GROUND.  
WHEN RECONNECTING THE WIRE LEADS TO  
ANY PART, MAKE SURE THE WIRING CONNE-  
CTIONS AND LEAD COLORS ARE CORRECTLY  
MATCHED ACCORDING TO THE OVERALL CIR-  
CUIT DIAGRAM. (ESPECIALLY SWITCHES AND  
HIGH VOLTAGE CIRCUIT.)  
Circuit Board  
A. REMOVING POWER AND CONTROL  
CIRCUIT BOARD (Figures 1, 2 and 3)  
Figure 2  
(1) Remove a screw securing the control panel  
assembly to the oven cavity.  
(2) Remove the control panel with pushing it upward.  
(3) Remove the connector (CN1) and wire leads  
(Relay6) from the circuit board.  
(5) Remove the FPC connector from the terminal  
socket following “HOW TO REMOVE THE FPC  
CONNECTOR” on the next page.  
(6) Remove the circuit board from the control bracket  
carefully.  
Control Panel  
Screw  
Control Bracket  
(CN5)  
FPC Connector(S1)  
Circuit Board  
-For the sensor  
model only  
(CN5)  
(CN2)  
Power  
Transformer  
(CN2)  
Relay 2  
(Relay 2)  
(CN1)  
Figure 1  
Figure 3  
7-4  
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HOW TO INSERT THE F.P.C. CONNECTOR  
HOW TO REMOVE THE F.P.C. CONNECTOR  
Follow the steps below as illustrated in Figures 6  
and 7 to insert the F.P.C. connector.  
(1) Insert the F.P.C. connector into the terminal  
socket securely with the fingers.  
(2) Hold the plastic fastener with thumb and  
forefinger of the other hand, and push it  
slowly into the terminal socket. (Figure 6)  
NOTE: When reconnecting the F.P.C  
connector make sure that the holes  
on the F.P.C. connector are properly  
engaged with the hooks on the plastic  
fastener  
Follow the steps below as illustrated in Figures 4  
and 5 to remove the F.P.C. connector.  
(1) Hold the edges of the plastic fastener with  
thumb and forefinger.  
(Figure 4)  
(2) Lift up the lever of the plastic fastener from  
the terminal socket by lightly pressing the  
lever end with forefinger.  
(Figure 5)  
(3) Remove the F.P.C. connector from the  
terminal socket.  
(3) Lock the level of the plastic fastener into the  
hook of the terminal socket securely by  
releasing the fingers.  
(Figure 7)  
Plastic fastener  
Plastic fastener  
Hook  
Holes  
F.P.C.  
Connector  
Terminal  
socket  
F.P.C.  
Connector  
Figure 4  
Terminal  
socket  
Figure 6  
Plastic fastener  
Hook  
Plastic  
fastener  
Holes  
F.P.C.  
Connector  
F.P.C.  
Connector  
Terminal  
socket  
Figure 5  
Terminal  
socket  
Figure 7  
7-5  
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B. REMOVING THE OUT CASE(Figure 8)  
(1) Remove the vent grille by removing two screws  
securing it to the out case.  
(2) Remove two screws securing it to the air duct.  
(3) Remove the mounting plate by turning the screws  
(1 or 2 screws) securing it to the out case.  
(4) Remove two screws on the left central edge and  
one screws on the right central edge of Base plate.  
Remove the Mount, All from the out case by  
removing one screw securing it to the out case.  
(5) Remove the outcase with disconnecting power  
cord connector.  
Mount,All  
(1 or 2 screws)  
Door  
Mounting  
Plate  
Out Case  
Vent Grille  
Controller  
Figure 8  
7-6  
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C REMOVING THE DOOR INTERLOCK  
SWITCHES (Figures 9,10)  
(1) Disconnect the wire leads from the interlock  
switches.  
(2) Remove two screws securing the Latch Board.  
(3) Make necessary replacements and check  
microwave energy leakage according to  
“ADJUSTMENT PROCEDURE” on page 7-12.  
Latch Board  
Secondary  
Interlock Switch  
Latch Board  
Secondary Interlock Switch  
WH(from H.V.Transformer)  
YL(from Fan Motor)  
WH(from Power Cord)  
WH  
(
from cooktop lamp  
)
Interlock  
Monitor Switch  
Primary  
Interlock Switch  
Monitor Interlock Switch  
Figure 10  
WH(from H.V.Transformer)  
RD(from H.V.Transformer)  
Primary Interlock Switch  
WIRE COLOR  
SYMBOL COLOR  
PK(from P.C.B)  
WHITE  
BLACK  
BROWN  
RED  
WH  
BK  
BR  
RD  
BL  
BL(from P.C.B)  
Figure 9  
BLUE  
PINK  
PK  
GY  
GREY  
Not Provided  
N.P.  
7-7  
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NOTES:  
D. REMOVING MAGNETRON  
(Figures 11 Through 13)  
(1) Remove the vent grille by loosening two screws.  
(Figure 11)  
• When removing the magnetron, make sure that its  
dome does not hit any adjacent parts, or it may be  
damaged.  
• When replacing the magnetron, be sure to install the  
magnetron gasket in the correct position and be sure  
that the gasket is in good condition.  
(2) Remove the outcase. See page 7-6.  
(3) Remove three tap tite screws securing the  
magnetron to the wave guide.  
• After replacing the magnetron, check for microwave  
energy leakage with a survey meter Check  
microwave energy leakage must be below the limit of  
5 mW/cm2 . (All service adjustments should be made  
for minimum microwave energy leakage readings.)  
(4) Remove the magnetron VERY CAREFULLY.  
Mount,All  
Figure 11  
(1 or 2 screws)  
Door  
Mounting  
Plate  
Out Case  
Vent Grille  
Controller  
(3 screws)  
Figure 12  
Figure 13  
7-8  
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E. REMOVING STIRRER FAN  
(Figures 14 and 15)  
(1) Remove one rivet ASS'Y securing it to the oven  
upper plate by using knife blade.  
F. REMOVING DOOR (Figure 16)  
(1) Remove the vent grille by two screws securing it to  
the outcase loosening.  
(2) Lift up and draw the door.  
(2) Rotate slightly and pull out the stirrer fan cover.  
(3) Remove the stirrer fan.  
NOTES:  
• After replacing the door, be sure to check that the  
primary interlock switch, the secondary interlock  
switch and the interlock monitor switch is in good  
operating normally.  
• After replacing the door, check for microwave energy  
leakage with a survey meter. Microwave energy  
leakage must be below the limit of 5mW/cm2.  
(With a 275 ml water load)  
Figure 14  
Figure 16  
G. DISASSEMBLING DOOR (Figure 17)  
(1) Remove the dielectric choke by using knife blade  
or small screw driver, etc.  
(2) Remove two screws securing it to the door handle.  
CAUTION: Be careful not to damage door seal  
plate with the screwdriver.  
Figure 15  
Door Screen  
Figure 17  
7-9  
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(3) Carefully pull the ventilation motor ASS'Y out of the  
microwave oven. (See Figure 19-b)  
H. ASSEMBLING DOOR  
(1) When mounting the door assembly to the oven  
assembly, be sure to adjust the door assembly  
parallel to the chassis. Also adjust so the door has no  
play between the inner door surface and oven frame  
assembly. If the door assembly is not mounted  
properly, microwaves may leak from the clearance  
between the door and the oven.  
Space  
Figure 19-b  
J. REPLACING THE HUMIDITY SENSOR  
(For sensor model only)  
(1) Remove the sensor by removing two screws  
securing it to the air duct. (See Figure 19-c)  
(2) Mount the new humidity sensor to the air duct.  
I. REMOVING THE VENTILATION MOTOR  
(1) Remove the mounting plate by loosening mounting  
plate screws (1 or 2 screws) securing it to the back  
plate. (See Figure 18)  
(2) Remove MOUNT ALL loosening one screw  
loosening one screw securing the ventilation Motor  
and back plate. (See Figure 19-a)  
(1 or 2 screws)  
Figure 18  
Figure 19-c  
MOUNT, ALL  
Figure 19-a  
7-10  
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NOTES:  
K. REMOVING THE TURNTABLE MOTOR  
(1) Remove the turntable.  
• Remove the leadwire from the turntable motor VERY  
CAREFULLY.  
• Be sure to grasp the connector not the wires when  
removing.  
(2) Remove the turntable shaft VERY CAREFULLY  
with a slotted screwdriver. (Figure 20)  
(3) Remove the base plate by removing 7 screws  
securing it to the oven cavity. (Figure 21)  
(4) Disconnect the leadwire from the turntable motor  
terminals.  
(5) Remove the 2 screws securing the turntable motor  
to the oven cavity ASS'Y. (Figure 22)  
Figure 20  
Figure 21  
Wire Leads  
Turntable Motor  
Figure 22  
7-11  
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INTERLOCK SYSTEM  
INTERLOCK MECHANISM  
The door lock mechanism is a device which has been specially designed to eliminate completely microwave  
activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave  
leakage.  
ADJUSTMENT PROCEDURES  
CHECK THE DOOR LATCH AND SWITCH  
CLOSING.  
To avoid possible exposure to microwave energy  
leakage, adjust the door latches and interlock  
switches, using the following procedure.  
NOTE:  
The outer cover of the microwave oven is  
removed.  
The Interlock Monitor and Primary Interlock Switch act  
as the final safety switch protecting the user from  
microwave energy. The terminals between “COM” and  
“NC” of the Interlock Monitor must close when the door  
is opened. After adjusting the Interlock Monitor Switch,  
make sure that it is correctly connected.  
(1) Set the microwave oven on its side so that you can  
see the latch board and the switches, as shown in  
Figure 23-a.  
Mounting of the primary/monitor/secondary switches to  
the latch board.  
(2) Close the door tightly and check gaps A and B to  
be sure they are no more than 1/64(0.5 mm).  
See Figure 23-b for close-up view of gaps A and B  
(door latches). If all gaps are less than 1/64”  
(0.5 mm), adjustment of the latch board may not  
be necessary. Go to Steps 5 and 6 to check the  
sequence of the switches.  
Latch Board  
NOTE:  
Secondary  
Interlock Switch  
To correct sequence of the Primary Interlock  
Switch, Secondary Interlock Switch and the  
Interlock Monitor Switch is very important.  
If any gap is larger than 1/64(0.5 mm), you will  
need to adjust the latch board”. Go to step 3  
and follow all steps in order.  
ADJUST THE LATCH AND SWITCH CLOSING  
Interlock  
Monitor Switch  
(3) Loosen the two screws holding the plastic latch  
board as shown.  
Primary  
Interlock Switch  
(4) With the oven door closed tightly, move the latch  
board upward toward the top of the oven and/or  
away from the door latch until the gaps are less  
than 1/64(0.5 mm).  
Figure 23-a  
Hold the latch board tightly in this position until you  
check the sequence of the switches in steps 5  
and 6.  
LATCH  
0-1/64"  
Figure 23-b  
LATCH BOARD  
0-1/64"  
7-12  
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TEST THE LATCH AND SWITCH SEQUENCE  
(5) Open the oven door slowly. Watch the door latch,  
the Secondary Switch. Release Rod and Lever  
on the switches to make sure they are zero to the  
body of the switches in the following sequence:  
(7) When you achieve the proper sequence of  
switches in Steps 5 and 6, tighten the latch board  
screws at that point.  
TEST THE MICROWAVE ENERGY LEAKAGE  
- Primary Interlock Switch  
- Secondary Interlock Switch  
- Interlock Monitor Switch  
Make sure the microwave energy leakage is below the  
limit of 1mW/cm2 (with a 275 ml water load) and  
5mW/cm2 (with a 275 ml water load without the  
cabinet) when measured with a survey meter.  
Adjust the latch board until the switches operate in  
this sequence. See Steps 3 and 4.  
(6) Close the oven door slowly and be sure it is tightly  
closed. Watch the three switches to make sure  
they are zero to the body of the switches in the  
following sequence:  
- Interlock Monitor Switch  
- Primary Interlock Switch  
- Secondary Interlock Switch  
NOTE: The Interlock Monitor Switch is an added  
safety check on the Primary and  
Secondary Interlock Switches. If the  
Primary and Secondary Interlock Switches  
allow the oven to operate with the door  
open, the Monitor Switch will blow the  
fuse.  
7-13  
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INTERLOCK CONTINUITY TEST  
A. PRIMARY INTERLOCK SWITCH TEST  
B. SECONDARY INTERLOCK SWITCH TEST  
Disconnect the wire lead from the secondary  
switch.  
When the door is opened slowly, an audible click  
should be heard at the same time or successively  
at intervals and the latches should activate the  
switches with an audible click.  
If the latches do not activate the switches when the  
door is closed, the switches should be adjusted in  
accordance with the adjustment procedure.  
Disconnect the wire lead from the primary switch.  
Connect the ohmmeter leads to the common  
(COM) and normally open (NO) terminal of the  
switch. The meter should indicate an open circuit  
in the door open condition.  
Connect the ohmmeter leads to the common  
(COM) and normally open (NO) terminals of the  
switch. The meter should indicate an open circuit  
in the door open condition. When the door is  
closed, the meter should indicate a closed circuit.  
When the secondary switch operation is abnormal,  
make the necessary adjustment or replace the  
switch only with the same type of switch.  
C. MONITOR SWITCH TEST  
When the door is closed, the meter should indicate  
a closed circuit.  
When the primary switch operation is abnormal,  
make the necessary adjustment or replace the  
switch with the same type of switch.  
Disconnect the wire lead from the monitor switch.  
Connect the ohmmeter leads to the common  
(COM) and normally closed (NC) terminals of the  
switch. The meter should indicate a closed circuit  
in the door open condition. When the door is  
closed, the meter should indicate an open circuit.  
When the monitor switch operation is abnormal,  
replace with the same type of switch.  
NOTE: After repairing the door or the interlock  
system, it is necessary to do this continuity  
test before operating the oven.  
COMPONENTS  
TEST PROCEDURE  
RESULTS  
SWITCHES  
(Wire leads removed)  
Check for continuity of the  
switch with an Ohm-meter  
Door  
open  
Door  
closed  
Primary  
COM  
NO  
Switch  
NC  
Monitor  
COM  
Switch  
Secondary  
Switch  
NO  
COM  
NOTE : After checking for the continuity of switches, make sure that they are  
connected correctly.  
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION  
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.  
TYPE NO. SZM-V16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH  
TYPE NO. SZM-V16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH  
TYPE NO. SZM-V16-FA-63 OR VP-533A-OF OR V-5230Q FOR SECONDARY SWITCH  
7-14  
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TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING  
- CAUTIONS -  
Secondary  
Winding  
- DISCONNECT THE POWER SUPPLY CORD  
FROM THE WALL OUTLET WHENEVER  
REMOVINGING THE CABINET FROM THE UNIT.  
PROCEED WITH THE TESTS ONLY AFTER  
DISCHARGING THE HIGH VOLTAGE CAPACITOR  
AND REMOVING THE WIRE LEADS FROM THE  
PRIMARY WINDING OF THE HIGH VOLTAGE  
TRANSFORMER. (SEE FIGURE 24)  
Filament  
Winding  
- ALL OPERATIONAL CHECKS WITH MICROWAVE  
ENERGY MUST BE DONE WITH A LOAD (1 LITER  
Primary  
Winding  
OF WATER IN CONTAINER) IN THE OVEN.  
Figure 24  
A. TEST PROCEDURES  
COMPONENTS  
TEST PROCEDURES  
RESULTS  
1) Measure the resistance: Across the  
filament terminals of the magnetron  
with an ohm-meter on Rx1 scale.  
Normal reading:  
Less than 1 ohm.  
2) Measure the resistance: Between  
each filament terminal of the  
Normal reading:  
Infinite ohms.  
MAGNETRON  
(Wire leads are  
removed)  
magnetron and the chassis ground  
with an ohm-mater on high test scale.  
NOTE: Replace the magnetron, if the  
magnetron checks and all of the  
high voltage component tests are  
good, but the unit still does not heat  
a load.  
1) Measure the resistance:  
With an ohm-meter on Rx1 scale.  
a. Primary winding;  
Normal readings:  
HIGH-VOLTAGE  
TRANSFORMER  
(Wire leads are  
removed)  
Approx. 0.2 to 0.5 ohm.  
Less than 0.1 ohm.  
Approx. 50 to 120 ohms.  
b. Filament winding;  
c. Secondary winding;  
2) Measure the resistance:  
With an ohm-meter on highest scale.  
a. Primary winding to ground;  
b. Filament winding to ground;  
Normal readings:  
Infinite ohms.  
Infinite ohms.  
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS  
SERVICED FOR ANY REASON.  
7-15  
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COMPONENTS  
TEST PROCEDURES  
Measure the resistance:  
RESULTS  
Normal reading:  
(1) Terminal to terminal  
Momentarily indicates several ohms,  
and then gradually returns to infinite  
ohms.  
Abnormal reading:  
Indicates continuity or infinite ohms  
from the beginning.  
Ohm-  
meter  
HIGH-VOLTAGE  
CAPACITOR  
Figure 25-a  
(2) Terminal to case  
Normal readings:  
Infinite.  
Abnormal reading:  
Indicates continuity.  
Ohm-  
meter  
Figure 25-b  
Measure the continuity:  
(1) Forward  
Normal readings:  
continuity.  
Abnormal reading:  
Infinite.  
Ohm-  
meter  
HIGH-VOLTAGE  
DIODE  
Figure 26-a  
(1) Reverse  
Normal readings:  
Infinite.  
Abnormal reading:  
continuity.  
Ohm-  
meter  
Figure 26-b  
7-16  
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COMPONENTS  
TEST PROCEDURES  
RESULTS  
When  
Measure the resistance between terminal  
pins of connector KEY CONNECTOR.  
NOTE:  
When reconnecting the FPC connector,  
make sure that the holes on the FPC  
connector are properly engaged with hooks  
on the plastic fastener.  
When not  
touched  
Resistance touched  
value  
Less than More than  
400 ohms 1 mega ohm  
FPC CONNECTOR  
Top  
MATRIX CIRCUIT FOR  
TOUCH KEY BOARD  
1
2
CONNECTOR(KEY CON)  
TOUCH KEY  
BOARD  
3
4
5
6
7
8
9
10  
11  
12  
13  
2
1
3
5
4
6
7
VENT  
HI/LOO/OFF  
TIME  
COOK  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
N.C  
5
6
0
1
2
3
4
8
LIGHT CUSTOM  
AUTO  
DEFROST  
HI/LOO/OFF  
SET  
9
KITCHEN  
TIMER  
LESS  
CLOCK  
Ez-On  
N.C  
7
8
10  
11  
12  
13  
LIGHT  
TIMER  
CUSTOM  
COOK  
POWER  
LEVEL  
TURNTABLE  
ON/OFF  
STOP  
CLEAR  
HOLD  
WARM  
START  
9
SENSOR  
PIZZA  
SENSOR SENSOR  
POTATO POPCORN  
SENSOR  
SENSOR SENSOR  
COOK  
MORE  
VEGETABLE REHEAT  
Figure 28  
Figure 27  
Normal: Approximately  
BK~RD: 4.5~6.2 Kohm  
RD~WH: 2.0~3.5 Kohm  
BK~WH: 2.0~3.5 Kohm  
SENSOR  
(For sensor model only)  
Abnormal: Infinite or several.  
1
2
3
BK  
RD  
WH  
Figure 29  
7-17  
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COMPONENTS  
TEST PROCEDURES  
RESULTS  
POWER  
LEVEL  
Check for continuity of relay 2 with an  
ohm-meter.  
(Remove wire leads from relay 2 and  
operate the unit.)  
1
2
4 sec  
6 sec  
18 sec  
16 sec  
14 sec  
12 sec  
10 sec  
8 sec  
6 sec  
4 sec  
2 sec  
0
Relay 2  
3
8 sec  
4
10 sec  
12 sec  
14 sec  
16 sec  
18 sec  
20 sec  
22 sec  
RELAY2  
5
6
7
8
Figure 32  
9
10  
CAUTION : The relay connector 2 must  
be correctly connected Relay 2.  
NOTES:  
A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR  
ANY REASON.  
MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.  
WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT  
THE WIRES.  
B. CHECKOUT PROCEDURES  
(1) CHECKOUT PROCEDURES FOR FUSE BLOWING  
CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.  
PROBLEMS  
CAUSES  
Fuse blows immediately after  
the door is closed.  
Improper operation of the primary interlock, secondary  
interlock switches and/or the interlock monitor switch.  
Fuse blows immediately after  
the door is opened.  
Fuse blows when the door is closed and START  
key is touched.  
Malfunction of the high voltage transformer; the high  
voltage capacitor including the diode, the magnetron,  
the blower motor or the circuit board.  
NOTES:  
If the fuse is blown by an improper switch operation, replace the all Interlock switches, PCB Ass’y and the fuse at  
the same time. After replacing the the all Interlock switches, PCB Ass’y,Fuse with new ones, make sure that they  
are correctly connected.  
Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7-12  
when the primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or  
replaced.  
7-18  
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(2) CHECKOUT PROCEDURES FOR RELAY.  
- PROBLEM (A) -  
FAN motor and oven lamp turn on without touching  
START key when the door is closed.  
NO  
YES  
Remove the mate connector of I/O  
CON from the circuit board.  
Does the unit still operate?  
GOOD  
NO  
YES  
Replace the  
circuit board  
Defective  
RELAY1  
Replace  
RELAY1  
- PROBLEM (B) -  
FAN motor and oven lamp turn on When the door is  
closed and START key is touched.  
NO  
YES  
Measure the voltage at pin NO.  
35 of U01  
GOOD  
Voltage reading: 0 Vdc  
10 of U03  
Voltage reading: about 15V  
YES  
NO  
Defective  
RELAY1 or poor  
connection of  
RELAY1  
Replace the  
circuit board  
Replace  
RELAY1 or correct  
the connection.  
7-19  
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(3) CHECKOUT PROCEDURES FOR CIRCUIT  
BOARD  
The following symptoms indicate a defective circuit  
board.  
6) Wrong figures appear.  
7) The figures of all digits.  
1) The start function fails to operate but the high  
voltage Systems, the interlock switches, the door  
sensing and the relay check good.  
8) Some of the indicators do no flicker light up.  
9) The clock does not keep time properly.  
2) The unit with a normal relay continuously operates.  
3) Proper temperature measurement is not obtained.  
4) The buzzer does not sound or continues to sound.  
5) Some segments of one or more digits do not light  
up, or they continue to light up, or segments light  
when they should not.  
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS  
SERVICED FOR ANY REASON.  
7-20  
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7-21  
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7-22  
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7-23  
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7-24  
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7-25  
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EXPLODED VIEW  
DOOR  
13581A  
13536A  
13213A  
13552A  
WTP004  
14760A  
13720D  
14890A  
14970A  
14026A  
WTT028  
13650A  
8-1  
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CONTROL PANEL  
24781M  
WTP018  
23506A  
268711  
24810P  
* 07  
8-2  
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OVEN CAVITY  
WTT021  
34960A  
WTT027  
WTT029  
33550P  
WTT028  
WTT029  
WTT027  
33530A  
34810Q  
33112U  
WTT022  
63303A  
368771  
34930R  
330342  
56804A  
35026G  
WTT022  
535501  
63302A  
36912C  
330341  
35230A  
WTT022  
8-3  
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LATCH BOARD  
43500A  
43501A  
466001  
WSZ084  
466003  
466001  
44510A  
8-4  
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INTERIOR (I)  
33390G  
56324A  
WSZ002  
34370T  
54810C  
55238A  
WTT021  
50CZZH  
35889A  
56851D  
33052A  
WSZ002  
56170D  
WTP002  
WSZ002  
55892A  
54930F  
WTT021  
36549S  
56930G  
53550F  
568772  
WTP013  
53300B  
340511  
WSZ002  
8-5  
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INTERIOR (II)  
36549V  
WTT034  
535502  
56912B  
56549F  
56804A  
WTT029  
56901A  
WTP004  
55262A  
WSZ002  
56411A  
50FZZA  
56501A  
56930V  
WTP013  
55900A  
WTT028  
56820A  
55231C  
568771  
*01  
*02  
*04  
WTT028  
33700A  
8-6  
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INSTALLATION  
WSZ098  
44360A  
WSZ133  
WSZ204  
WWZ068  
WWZ068  
WSZ203  
56411A  
65862D  
63300M  
65862B  
WSZ136  
63861A  
8-7  
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SCHEMATIC DIAGRAM OF P.C.B  
8-14  
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PRINTED CIRCUIT BOARD  
8-15  
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May, 2003  
P/NO : 3828W5S3224  
Printed in Korea  
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