Whirlpool Microwave Oven 721663398 User Manual

MODEL 721.66339  
DIVISION 20  
BASIC FIELD MANUAL  
FOR  
MICROWAVE OVEN  
MODEL 721.66339800  
February, 2008  
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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.  
MODEL 721.66339  
MECHANICAL SERVICE INFORMATION  
TABLE OF CONTENTS  
1. Adjustment Procedures  
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3
5
5
5
6
2. Precautions on Installation  
3. General Precautions in Use  
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4. Trial Operation  
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5. Specifications  
6. Overall Circuit Diagram  
7. Operating Procedures  
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9-10  
11-12  
13-17  
8. Procedure for Measuring Microwave Energy Leakage  
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9. Disassembly Instructions  
10. Interlock Continuity Test  
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18  
11. Test and Checkout Procedures, and Troubleshooting  
A. Test Procedures  
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19-21  
22-24  
25-29  
B. Checkout Procedures  
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C. Troubleshooting  
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12. Exploded view  
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30-37  
38-39  
13. Part Reference list  
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ADJUST THE LATCH AND SWITCH CLOSING  
1. ADJUSTMENT PROCEDURES  
To avoid possible exposure to microwave energy  
leakage, adjust the door latches and interlock switches,  
using the following procedure.  
(3) Loosen the two screws holding the plastic latch board as  
shown.  
(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).  
ONLY AUTHORIZED SERVICE PERSONNEL  
SHOULD MAKE THIS ADJUSTMENT.  
The Interlock Monitor and Primary Interlock Switch acts  
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. See Figures 1-a  
and 1-b throughout this procedure.  
Hold the latch board tightly in this position until you  
check the sequence of the switches in steps 5 and 6.  
TEST THE LATCH AND SWITCH SEQUENCE  
(5) Open the oven door slowly. Watch the door latch, the  
Primary Switch. Release Rod and Lever on the switches  
to make sure they are zero to the body of the switches  
in the following sequence:  
CHECK THE DOOR LATCH AND SWITCH  
CLOSING.  
- Primary Interlock Switch  
- Secondary Interlock Switch  
- Interlock Monitor Switch  
NOTE: The outer cover of the microwave oven is  
removed.  
(1) Set the microwave oven on its side so that you can see  
the latch board and the switches, as shown in  
Figure 1-a.  
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:  
(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  
1-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.  
- Interlock Monitor Switch  
- Primary Interlock Switch  
- Secondary Interlock Switch  
NOTE: To correct sequence of the Primary Interlock  
Switch, Secondary Interlock Switch and the  
Interlock Monitor Switch is very important.  
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.  
If any gap is larger than 1/64(0.5 mm), you will need to  
adjust the latch board-U, L. Go to step 3 and follow all  
steps in order.  
(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  
(8) Using a survey meter, make sure the microwave energy  
is below 5 mW/cm.sq.  
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LATCH BOARD  
DOOR LATCH  
SECONDARY  
INTERLOCK  
SWITCH  
A
MONITOR  
INTERLOCK  
SWITCH  
PRIMARY  
INTERLOCK  
SWITCH  
DOOR LATCH  
Figure 1-a  
LATCH  
0-1/64"  
LATCH BOARD  
0-1/64"  
Figure 1-b  
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2. PRECAUTIONS ON INSTALLATION  
(Figure 2)  
4. TRIAL OPERATION  
After installation, the following sequences and results  
A. Plug the power supply cord into a 120 V AC, 60 Hz,  
single-phase power source with a capacity of at least 20  
amperes.  
should be checked carefully.  
A. Put a container filled with water (about 1 liter) into the  
oven, and close the door tightly.  
B. Since the unit weights about 36.5 lbs, be sure to place it  
on a sturdy and flat surface.  
C. Avoid placing the unit in a location where there is direct  
heat or splashing water.  
B. Touch the STOP/CLEAR and the COOK TIME keys.  
C. Set cooking time for 10 minutes by touching 1”  
and then 0three times. 1000appears in the  
display window.  
D. Place the unit as far away as possible from TV, radio,  
etc. to prevent interference.  
D. 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.  
CAUTION  
E. After about 5 minutes, make sure the primary interlock  
switch, the secondary interlock switch and the interlock  
monitor and oven lamp switch operate properly by  
opening and closing the door several times. Touch the  
START key each time the door is closed.  
F. Continue operating the unit. Four long beep sound  
signal is heard when the time is up. The unit will shut off  
automatically.  
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.  
Properly Polarized and  
Grounded  
Outlet  
G. Confirm the water is hot.  
H. Finally, measure the output power according to  
POWER OUTPUT MEASUREMENTon page 12.  
Three-Pronged(Grounding)  
5. FEATURES AND SPECIFICATIONS  
A. The safety systems incorporated in this model are:  
(1) Primary interlock switch  
Plug  
Figure 2  
3. GENERAL PRECAUTIONS IN USE  
(2) Secondary interlock switch  
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 turntable tray 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.  
(3) Interlock monitor switch  
(4) Choke system  
(5) 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 120W to  
1200W can be selected by the touch control and  
electronic computer system.  
C. Cooking time can be displayed on the digital readout.  
D. Three different cooking stages can be set. The oven  
remembers three cooking stages and changes from one  
cooking stage to another. This is made possible with the  
memory function of the microprocessor.  
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SPECIFICATIONS  
Rated Power Consumption ..........................................1650W maximum  
Output ..........................................................................1200W maximum (*IEC 60705 Rating standard)  
...................................................................Adjustable 100W through 1200W, 11 steps  
Frequency ....................................................................2,450 MHz ± 50 MHz  
Power Supply...............................................................120V ±12V AC, 60Hz  
Rated Current...............................................................13.8 Amp.  
Magnetron Cooling.......................................................Forced Air Cooling  
Microwave Stirring........................................................Turntable  
Rectification..................................................................Rectification Voltage Doubler Half-Wave  
Door Sealing ................................................................Choke System  
Safety Devices .............................................................Thermostat:  
Open at 90°C ± 5°C  
Open at 75°C ± 5°C  
Fuse(15A)  
Primary Interlock Switch  
Secondary Interlock Switch  
Interlock Monitor  
Magnetron....................................................................2M246  
High Voltage Capacitor ................................................Capacitor: 1.05µF, 2.1KV Ac  
High Voltage Diode ......................................................350mA, 9.0KV  
Cavity Lamp .................................................................125V, 20W  
Timer............................................................................Digital, up to 99 mm. 99 sec. (in each cooking stage)  
Tray..............................................................................Tempered Safety Glass  
Overall Dimensions......................................................217/18(W) x 121/2(H) x 171/8(D)  
Oven Cavity Size..........................................................1411/16(W) x 95/8(H) x 155/8(D)  
Effective Capacity of Oven Cavity................................1.2 Cu.ft.  
Accessories..................................................................Use and Care Manual ,Turntable,  
Rotating Ring Assembly.  
SWITCH TABLE  
PRIMARY  
INTERLOCK  
SWITCH  
SECONDARY  
INTERLOCK  
SWITCH  
INTERLOCK  
MONITOR  
SWITCH  
SWITCH MODE  
CONDITIONS  
COM  
NO  
COM  
NO  
COM  
NC  
0
DOOR OPEN  
0
0
DOOR CLOSED  
NOTE: Use the above switch table with circuit diagram on page 7.  
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6. OVERALL CIRCUIT DIAGRAM  
A. SCHEMATIC DIAGRAM  
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B. MATRIX CIRCUIT FOR TOUCH KEY BOARD  
Figure 4  
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7. OPERATING PROCEDURES  
A. OVEN CONTROL PANEL  
1. DISPLAY. The display includes a clock and indicators that tell you  
time of day, cooking time settings, and cooking functions selected.  
2. QUICK TOUCH SENSOR. This pad allows you to cook most of  
your favorite foods without having to select cooking times and  
power levels.  
3. MORE / LESS. All of the one touch cook and Timed Cook can be  
adjusted to cook food for a longer or shorter time.  
MORE  
LESS  
time.  
Press MORE will add 10 seconds to the cooking time.  
Press LESS will subtract 10 seconds to the cooking  
4. AUTO DEFROST. This pad is an accurate defrosting method for  
frozen meat, poultry and fish up to 6.0 lbs.  
®
5. TrueCookPlus . Touch this pad to cook food according to  
TrueCookPlus® code.  
6. NUMBER PADS. Touch Number Pads to enter cooking time,  
power level, quantities, or food categories.  
7. COOK TIME. Touch this pad to set a cooking time.  
8. STOP/CLEAR. Touch this pad to stop the oven or clear entries.  
9. EXPRESS DEFROST. This pad provides you with the quick  
defrosting method for 1.0 pound frozen foods.  
10. MELT. Touch this pad to melt chocolate, cheese, butter, or  
marshmallows.  
11. SOFTEN. Touch this pad to soften ice cream, cream cheese,  
butter, or frozen juice.  
12. AUTO COOK. Touch this pad to select programming food items.  
13. KITCHEN TIMER. Touch this pad to use your microwave oven as  
a kitchen timer.  
14. CLOCK. Touch this pad to enter the time of day.  
15. OPTION. Touch this pad to change the oven's default settings for  
sound, clock, scroll speed and weight.  
16. POWER. Touch this pad to set a cooking power.  
17. ADD MINUTE. Touch this pad to cook at 100% cook power for  
1 minute to 99 minutes and 59 seconds.  
18. START. Touch this pad to start all entries (except the Quick  
Touch Sensor, Express Defrost, Auto Cook and Add Minute  
function which start automatically) and to turn Child Lock on or off.  
Figure 5  
NOTE: A “beep” sounds when you touch a “key” on the control panel, to indicate that you have entered  
a setting.  
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(6) TIMED COOKING  
B. EASY USE TABLE  
1. Touch STOP/CLEAR.  
2. Touch COOK TIME.  
(1) KITCHEN TIMER  
3. Touch number for cooking time.  
4. Touch POWER.  
5. Touch number for cooking power level.  
6. Touch START.  
1. Touch STOP/CLEAR.  
2. Touch KITCHEN TIMER.  
3. Touch correct number for time.  
4. Touch START.  
(7) MULTI-STAGE COOKING  
1. Touch STOP/CLEAR.  
(2) CHILD LOCK  
To set:  
2. Touch COOK TIME.  
3. Touch number for cooking time.  
4. Touch POWER.  
1. Touch STOP/CLEAR.  
2. Touch STARTmore than 4 seconds.  
To cancel:  
5. Touch number for cooking power level.  
6. Repeat steps 2-5 to set 2nd cooking stage.  
7. Touch START.  
1. Touch STOP/CLEAR.  
2. Touch STARTmore than 4 seconds.  
(3) SENSOR COOK  
1. Touch STOP/CLEAR.  
2. Touch SENSOR COOK Category.  
(4) ADD MINUTE  
1. Touch STOP/CLEAR.  
2. Touch ADD MINUTE.  
(5) AUTO DEFROST  
1. Touch STOP/CLEAR.  
2. Touch AUTO DEFROST.  
Three different defrosting levels are provided.  
(Touch 1 : Meat  
Touch 2 : Poultry  
Touch 3 : Fish)  
3. Enter the weight of your food in decimal  
increments from 0.1 to 6.0 pounds.  
4. Touch START  
5. At beeping, turn food over.  
6. After turning food over, touch START to resume  
defrosting.  
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8. PROCEDURE FOR MEASURING MICROWAVE  
ENERGY LEAKAGE  
B. MEASURING MICROWAVE ENERGY LEAKAGE  
(1) Pour 275±15cc of 20±5°C water in a beaker which is  
graduated to 600 cc, and place the beaker in the center  
of the oven.  
A. CAUTIONS  
(1) Be sure to check a microwave emission prior to servicing  
the oven if the oven is operative prior to servicing.  
(2) The service personnel should inform the manufacturer,  
importer, or assembler of any certified oven unit found to  
have a microwave emission level in excess of  
5mW/cm.sq. 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.  
(2) Set the energy leakage monitor to 2,450 MHz and use it  
following the manufacturer’s recommended test  
procedure to assure correct result.  
(3) When measuring the leakage, always use the 2 inch  
(5cm) spacer supplied with the probe.  
(4) Operate the oven at its maximum output.  
(5) Measure the microwave radiation using and  
electromagnetic radiation monitor by holding the probe  
perpendicular to the surface being measured. (See  
Figure 7)  
(3) 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.  
NOTE: Address on CDRH  
Move probe along shaded area.  
Probe scanning speed  
less than 2.5 cm/sec.  
Office of Compliance (HFZ-312)  
Center for Devices and Radiological Health  
1390 Piccard Drive  
Rockville, Maryland 20850  
(4) The service personnel should check all surface and vent  
openings for microwave emission testing.  
(5) Check for microwave energy leakage after every  
servicing. The power density of the microwave radiation  
leakage emitted by the microwave oven should not  
exceed 1mW/cm.sq. And always start measuring of an  
unknown field to assure safety for operating personnel  
from radiation leakage.  
Figure 7  
NOTE: The standard is 5mW/cm.sq. while in the  
customer’s home. 1mW/cm.sq. stated here is  
manufacturer’s own voluntary standard for units in  
customer’s home.  
C. MEASUREMENT WITH THE OUTER CASE REMOVED  
(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.  
EQUIPMENT  
• Electromagnetic energy leakage monitor (NARDA 8100B,  
HOLADAY HI 1501)  
• 600cc glass beaker  
- Around the magnetron  
- The waveguide  
• Glass thermometer 100°C  
WARNING: AVOID CONTACTING ANY HIGH VOLTAGE  
PARTS.  
Figure 6  
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D. 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.  
G. POWER OUTPUT MEASUREMENT  
(1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap  
water.  
(2) Stir the water in the beaker with thermometer ( ˚F or ˚C) and  
measure temperature as T1.  
(3) Place the beaker on the center of turntable.  
(4) Set for one (1) minute and three (3) seconds and operate  
the oven at high power.  
(2) Microwave energy leakage must not exceed the values  
prescribed below.  
NOTES:  
NOTE: The additional three (3) seconds is to allow the  
magnetron to begin generating power.  
Leakage with the outer panels removed - less than  
5mW/cm.sq. Leakage for a fully assembled oven  
(Before the latch switch (primary) is interrupted) with the  
door in a slightly opened position - less than  
1 mW/cm .sq.  
(5) When the heating is finished, stir the water again with  
thermometer and measure the temperature of water as T2.  
(6) Subtract T1 from T2, this will give you the temperature rise.  
(7) The microwave power output is within specification, if the  
temperature rise is as shown below:  
E. NOTE WHEN MEASURING  
Temperature Rise  
(1) Do not exceed meter full scale deflection.  
(2) The test probe must be removed no faster than 1  
inch/sec (2.5cm/sec) along the shaded area, otherwise  
a false reading may result.  
Line Voltage  
120 V  
Degrees ˚F  
18.9 ~ 25.2  
Min. 17.5  
Degrees ˚C  
10.5 ~ 14  
Min 9.7  
108 V  
(3) The test probe must be held with the grip portion of the  
handle. A false reading may result if the operators  
hand is between the handle and the probe.  
(4) When testing near a corner of the door, keep the probe  
perpendicular to the surface making sure the probe  
is moved horizontally along the oven surface.  
(8) Power output will be influenced by line voltage of power  
supply. Consequently, correct power output must be  
measured within 120V AC ± 1 Volt while unit is operating.  
SPECIAL TIP  
• This oven used the button head screws.  
F. 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 1mW/cm.sq. after determining that all parts are in  
good condition, functioning properly and genuine  
replacement parts which are listed in this manual have  
been used.  
Button Head  
(Torx style 2)  
• When you remove the screws, using the  
tamper-resistant Torx driver have a  
pin-in-head.  
(3) At least once a year, have the electromagnetic energy  
leakage monitor checked for calibration by its  
manufacturer.  
-12-  
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(6) Pull down and remove the circuit board from the control  
panel.  
(7) Remove the F.P.C connector from the terminal socket.  
9. DISASSEMBLY INSTRUCTIONS  
IMPORTANT NOTES:  
UNIT MUST BE DISCONNECTED FROM ELECTRICAL  
OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS,  
ADJUSTMENTS AND CONTINUITY 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 10KOHM  
RESISTOR IN SERIES TO GROUND. WHEN  
Remove screw  
ground  
screw  
securing  
screw  
RECONNECTING THE WIRE LEADS TO ANY PART,  
MAKE SURE THE WIRING CONNECTIONS AND LEAD  
COLORS ARE CORRECTLY MATCHED ACCORDING  
TO THE OVERALL CIRCUIT DIAGRAM. (ESPECIALLY  
SWITCHES AND HIGH VOLTAGE CIRCUIT.)  
A. REMOVING OUTSIDE CASE (Figures 8)  
(1) Remove three screws from the rear section.  
(2) Remove one screw from the side section.  
(3) Push the outer case back about 1 inch (3cm).  
(4) Lift the case from the set.  
Lift up and pull out control panel  
Figure 8  
B. REMOVING POWER AND CONTROL CIRCUIT  
BOARD(Figure 9)  
(1) Open the door.  
F.P.C.Connector  
Circuit Board  
Control Panel  
(2) Remove two screws, securing the circuit board.  
(3) Disconnect the lead wire from RELAY(RY2) on the  
circuit board.  
(4) Lift up and pull out control panel assembly carefully  
from the cavity.  
(5) Disconnect the lead wire from connector(CN1) on the  
circuit board.  
CAUTION: DISCHARGE THE HIGH VOLTAGE  
CAPACITOR BEFORE SERVICING.  
Figures 9  
-13-  
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C. DOOR ASSEMBLY / REMOVAL  
(1) Open the door.  
Remove choke cover  
(2) Remove the choke cover very carefully with a flat-blade  
screwdriver.  
CAUTION : Be careful not to damage door seal plate by  
screwdriver.  
(3) Lift up and push the door.  
NOTE:  
1. After replacing the door, be sure to check that the primary  
switch, monitor switch, and secondary switch operate  
normally.  
2. After replacing the door, check for microwave energy leakage  
with a survey meter. Microwave energy must be below the  
limit of 5 mW/cm.sq. (with a 275 ml water load)  
3. 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.  
Remove Door  
Figure 10  
-14-  
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D. MAGNETRON REMOVAL  
E. REMOVING THE TURNTABLE MOTOR  
1) Remove the turntable and rotating ring.  
2) Lay the unit down on its back.  
3) Remove the turntable motor cover.  
The turntable base cover is easily removed by pinching  
the eight parts with a wire cutting.  
(1) Disconnect the wire lead from the magnetron.  
(2) Carefully remove the mounting screws holding the  
magnetron and the waveguide.  
(3) Remove the magnetron assembly until the tube is clear  
from the waveguide.  
4) Disconnect the leadwire from the turntable motor  
terminals.  
5) Remove the screw securing the turntable motor to the  
oven cavity ASSEMBLY.  
6) After repairing the motor, rotate the removed turntable  
motor cover.  
7) Fit the turntable motor cover’s projecting part to the base  
plate slit.  
NOTE:  
1. When removing the magnetron, make sure its dome  
does not hit any adjacent parts, or it may be damaged.  
2. 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.  
8) The taptite screw shall be used when a turntable motor  
cover is secured with a screw.  
3. After replacing the magnetron, check for microwave  
leakage with a survey meter around the magnetron.  
Microwave energy must be below the limit of 5 mW/cm2 .  
(With a 275 ml. water load).  
NOTE:  
1. Remove the wire lead from the turntable motor VERY  
CAREFULLY.  
Make sure that gasket is rigidly attached to the  
magnetron. To prevent microwave leakage, tighten the  
mounting screws properly, making sure there is no gap  
between the waveguide and the magnetron.  
2. Be sure to grasp the connector, not the wires, when  
removing.  
Air duct  
Magnetron  
Waveguide  
Dome  
Taptite Screw  
Waveguide  
Bracket  
Magnetron  
Gasket  
Wire Leads  
Magnetron  
Turntable Motor  
Figures 11  
Figures 12  
-15-  
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F. HIGH VOLTAGE TRANSFORMER REMOVAL  
I. REMOVING SENSOR  
1) Discharge the high voltage capacitor.  
2) Disconnect the leadwire from magnetron, high voltage  
transformer, and capacitor.  
1) Disconnect the leadwire from PCB Assembly.  
2) Remove a screw securing the sensor duct.  
3) Remove the screw holding the high voltage transformer to  
the baseplate.  
G. FAN MOTOR ASSEMBLY / REMOVAL  
1) Discharge the high voltage capacitor.  
2) Disconnect the leadwire from fan motor and high voltage  
capacitor.  
3) Remove the two screws holding the the suction guide  
ASSEMBLY to the oven cavity.  
4) Remove the two screws holding the fan motor ASSEMBLY  
to the suction guide ASSEMBLY.  
H. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL  
1) Discharge the high voltage capacitor.  
2) Disconnect the leadwire from fan motor and high voltage  
capacitor.  
3) Remove the screw holding the suction guide ASSEMBLY to  
the oven cavity.  
4) Remove the screw holding the high voltage capacitor bracket  
and remove the high voltage diode earth screw.  
Figures 14  
Figures 13  
-16-  
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J. INTERLOCK SYSTEM  
1) INTERLOCK MECHANISM  
The door lock mechanism is a device which has been  
specially designed to eliminate microwave  
activity when the door is opened during cooking and thus  
to prevent the danger resulting from the microwave  
leakage.  
2) MOUNTING OF THE PRIMARY/MONITOR/  
SECONDARY SWITCHES TO THE LATCH BOARD  
3) INSTALLATION AND ADJUSTMENT OF THE LATCH  
BOARD TO THE OVEN ASSEMBLY  
• Mount the latch board to the oven assembly.  
• Adjust the latch board in the arrow direction so that oven  
door will not have any play in it when the door is closed.  
• Tighten the mounting screw.  
• Check for play in the door by pushing the door  
release button. Door movement should be less than  
0.5 mm. (1/64 inch)  
Don't push the door release button while making this  
adjustment. Make sure that the latch moves smoothly after  
adjustment is completed and that the screws are tight.  
Make sure the primary, monitor, and secondary switches  
operate properly by following the continuity test  
procedure.  
Figures 15  
-17-  
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10. INTERLOCK CONTINUITY TEST  
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION  
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.  
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH  
TYPE NO. SZM-V 16-FA-62, VP-532A-OF OR V-5220Q FOR MONITOR SWITCH  
TYPE NO. SZM-V 15-FA-63, VP-533A-OFF OR SECONDARY SWITCH  
A. PRIMARY INTERLOCK SWITCH TEST  
B. SECONDARY INTERLOCK SWITCH TEST  
When the door release button is depressed slowly with  
the door closed, an audible click should be heard at  
the same time or successively at intervals. When the  
button is released slowly, 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 a 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.  
When the door is closed, the meter should indicate a  
closed circuit.  
Disconnect the wire lead from the secondary switch.  
Connect the ohmmeter leads to the common (COM)  
and normally open (NO) terminals of the switch. The  
meter should indicate a open circuit in the door open  
condition. When the door is closed, meter should  
indicate an 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  
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 closed circuit in the door open  
condition. When the door is closed, meter should  
indicate an open circuit. When the monitor switch  
operation is abnormal, replace with the same type of  
switch.  
When the primary switch operation is abnormal, make  
the necessary adjustment or replace the switch only  
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  
NO  
COM  
Switch  
Monitor  
Switch  
NC  
COM  
Secondary  
Switch  
NO  
COM  
NOTE : After checking for the continuity of switches, make sure that they are  
connected correctly.  
-18-  
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11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING  
CAUTIONS  
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE  
FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR  
AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE  
TRANSFORMER.  
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF  
WATER IN CONTAINER) IN THE OVEN.  
A. TEST PROCEDURES  
COMPONENTS  
HIGH VOLTAGE  
TEST PROCEDURE  
RESULTS  
TRANSFORMER  
(Wire leads removed)  
FILAMENT  
WINDING  
PRIMARY  
TERMINAL  
1. Measure the resistance.  
(Ohm-meter scale: Rx1 and Rx100)  
Primary winding  
Secondary winding  
Approx.: 0.2 ~ 0.4 ohm  
Approx.: 70 ~ 100 ohm  
Less than: 1 ohm  
Filament winding  
2. Measure the resistance.  
(Ohm-meter scale: Rx1000)  
Primary winding to ground  
Filament winding to ground  
Normal: Infinite  
Normal: Infinite  
MAGNETRON  
(Wire leads removed)  
1. Measure the resistance.  
(Ohm-meter scale: Rx1)  
Filament terminal  
Normal: Less than 1 ohm  
Normal: Infinite  
2. Measure the resistance.  
(Ohm-meter scale: Rx1000)  
Filament to chassis  
-19-  
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COMPONENTS  
TEST PROCEDURE  
RESULTS  
Antenna  
Gasket  
Chassis  
Filament  
NOTE: When testing the magnetron, be sure to install the magnetron gasket in the  
correct position and be sure that the gasket is in good condition.  
HIGH VOLTAGE  
CAPACITOR  
Measure the resistance.  
(Ohm-meter scale: Rx1000)  
Terminal to terminal.  
Normal: Momentarily indicates  
several ohms, and  
then gradually returns  
to infinite.  
Measure the resistance.  
(Ohm-meter scale: Rx1000)  
Terminal to case.  
Normal: Infinite.  
HIGH VOLTAGE  
DIODE  
Measure the continuity (Forward).  
(Ohm-meter scale: Rx10000)  
Normal: Continuity.  
Abnormal: Infinite.  
NOTE :  
Some inexpensive meters  
may indicate infinite  
resistance in both direction.  
Measure the continuity (Reverse).  
(Ohm-meter scale: Rx10000)  
Normal: Infinite.  
Abnormal: Continuity.  
-20-  
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COMPONENTS  
TEST PROCEDURE  
RESULTS  
Check for continuity of relay 2 with an ohm-  
meter.  
(Remove wire leads from relay 2 and operate  
the unit.)  
RELAY 2  
POWER  
LEVEL  
1
2
4 sec  
6 sec  
8 sec  
10 sec  
12 sec  
14 sec  
16 sec  
18 sec  
20 sec  
22 sec  
18 sec  
16 sec  
14 sec  
12 sec  
10 sec  
8 sec  
6 sec  
4 sec  
2 sec  
0 sec  
3
4
5
6
7
8
Relay 2  
9
10  
Normal:  
A: Approx. 85 ~ 100 ohm.  
B: Approx. 10 ~ 25 ohm.  
Measure the resistance.  
(Ohm-meter scale: R x 1)  
FAN MOTOR  
(Wire leads removed)  
B
Abnormal: Infinite or several  
ohm.  
A
Measure the resistance.  
(Ohm-meter scale: R x 1)  
TURNTABLE  
MOTOR  
(Wire leads removed)  
Normal: Approx.100~150 ohm  
Abnormal: Infinite or several  
ohm.  
1) Disconnect sensor connector from micom  
computer board.  
2) Measure resistance terminal to terminal  
(ohm meter scale: R X 1000)  
SENSOR  
Normal: Approximately  
BK - RD: 5.2 Kohm  
RD - WH: 2.1 Kohm  
BK - WH: 2.1 Kohm  
Abnormal: Infinite or several.  
* Sensor cooking condition  
1. Oven should be plugged in at least  
5 minutes before sensor cooking.  
2. Room temperature should not  
exceed 95°F .  
3. Be sure the exterior of the cooking  
container and the interior of the oven  
are dry. Wipe each off with paper  
towel.  
BK  
1
RD  
2
3
WH  
4. The oven will not generate  
microwave energy for the first 28  
seconds of the sensor cooking cycle.  
NOTE : A MICROWAVE LEAKAGE 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.  
-21-  
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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.  
Malfunction of the high voltage transformer; the high  
voltage capacitor including the diode, the magnetron,  
the blower motor or the circuit board.  
Fuse blows when the door is closed and START key  
is touched.  
NOTES:  
- If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same time.  
After replacing the defective switches with new ones, make sure that they are correctly connected.  
- Check for microwave energy leakage according to 1. ADJUSTMENT PROCEDURESon page 3, when the  
primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or replaced.  
-22-  
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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  
Replace the  
circuit board  
- PROBLEM (B) -  
FAN motor and oven lamp turn on When the door is  
closed and START key is touched.  
NO  
YES  
Check the interlock switches  
GOOD  
NO  
YES  
Defective  
Replace the  
RELAY or poor  
connection of  
relay  
micro switches.  
Replace  
RELAY or correct  
the connection.  
-23-  
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(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD  
The following symptoms indicate a defective circuit  
board.  
(1) The start function fails to operate but the high  
voltage Systems, the interlock switches, the door  
sensing and the relay check good.  
(4) Some segments of one or more digits do not light up, or  
they continue to light up, or segments light when they  
should not.  
(2) The unit with a normal relay continuously operates.  
(3) The buzzer does not sound or continues to sound.  
(6) Wrong figures appear.  
(7) The figures of all digits flicker.  
(8) Some of the indicators do no light up.  
(9) The clock does not keep time properly.  
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS  
SERVICED FOR ANY REASON.  
-24-  
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C. TROUBLE SHOOTING  
WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE  
FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE  
OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.  
CAUTIONS  
1. Check grounding before checking for trouble.  
2. Be careful of the high voltage circuit.  
3. Discharge the high voltage capacitor.  
4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these  
parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage  
to your meter.  
5. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.  
Always touch yourself to ground while working on this panel to discharge any static charge built up in your body.  
(Micom model only)  
CONDITION  
CAUSE  
REMEDY  
Microwave oven  
does not work.  
Avoid using other electrical  
appliances when you use the  
microwave oven.  
Inserting many plugs into one  
outlet and using them at the  
same time.  
(blown fuse or breaker)  
Microwave oven plug is not  
inserted tightly.  
Insert microwave oven plug  
securely.  
Use the microwave oven at  
adequate line voltage.  
Output power is too low.  
Low AC input voltage.  
This may not be a defect.  
It is possible that the food  
should be cooked for a  
longer time period.  
Food temperature is too low.  
Using metallic ware and  
allowing it to touch the oven  
wall.  
Do not use metallic ware for  
cooking except where noted  
in the cooking guide.  
Sparks occur.  
Do not use any type of  
cookware with metallic  
trimming.  
Ceramic ware trimmed in  
gold or silver powder is used.  
1. Use plastic wrap or lid.  
2. Stir once or twice while  
cooking soup, cocoa or  
milk, etc.  
Inconsistent intensity of  
microwave by their  
characteristics.  
Uneven cooking.  
-25-  
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(TROUBLE 1) The following visual conditions indicate a probable defective control circuit.  
1. Incomplete segments.  
Segment missing.  
Partial segment missing.  
Digit flickering (NOTE: Slight flickering is normal.)  
2. Colon does not turn on or blink.  
3. A distinct change in the brightness of one or more numbers in display.  
4. One or more digits in the display are not lighting.  
5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.  
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.  
7. Display does not count down with time blinking or up with clock operation.  
8. Display obviously jumps in time while counting down.  
9. Display counts down too fast while cooking.  
10. Each indicator light does not turn on after setting cooking cycle.  
11. Display time of day does not reappear when cooking is finished.  
CONDITION  
CHECK  
RESULT  
CAUSE  
REMEDY  
1. No input can be  
programmed.  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
Check the conn-  
ection between  
membrane key  
assembly and  
PCB assembly.  
Continuity  
Loose  
connection.  
Connect them  
tightly.  
No continuity  
Everything works  
as specified.  
2. Some inputs  
cannot be  
Defective key  
membrane  
assembly.  
Replace key  
membrane  
assembly.  
Replace key  
membrane  
assembly and  
check operation.  
programmed.  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
3. Display shows a  
number or figure  
different from one  
touched.  
Still have trouble.  
4. Random  
programming  
when touching  
other pads.  
5. Display is fixed  
at some figure  
and can not  
accept any  
input.  
-26-  
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(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,  
and no input is accepted.  
CONDITION  
CHECK  
RESULT  
CAUSE  
REMEDY  
Malfunction of the  
monitor switch.  
Replace fuse,  
primary, monitor  
switches, and  
RELAY(RY2) of  
P.C.B Assembly.  
Check continuity  
of monitor  
switch (with  
door closed).  
1. Fuse blows.  
Continuity.  
No continuity.  
Replace fuse  
Check continuity  
of primary  
switch (with  
Replace fuse,  
primary, monitor  
switches, and  
Continuity.  
Shorted contact at  
the primary switch.  
door opened).  
RELAY(RY2) of  
P.C.B Assembly.  
No continuity.  
Disconnect one  
side of the wire  
lead connected  
from transformer  
to the high  
Defective high  
voltage capacitor.  
Replace high  
voltage capacitor.  
Normal.  
Defective high volt-  
age transformer.  
Replace high volt-  
age transformer.  
Fuse blows again  
voltage  
capacitor and  
operate the unit.  
2. Fuse does not  
blow.  
No continuity.  
Continuity.  
Check continuity  
of thermostat.  
Defective  
thermostat.  
Replace  
thermostat.  
Defective power  
supply cord.  
Replace power  
supply cord.  
Check continuity  
of power supply  
cord.  
No continuity.  
-27-  
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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired  
program times are set and START pad is touched.  
CONDITION  
CHECK  
RESULT  
CAUSE  
REMEDY  
Defective  
secondary switch.  
Replace  
secondary switch.  
Check continuity  
of secondary  
switch (with  
1. Setting time  
does not count  
down when  
touching START  
pad.  
No continuity.  
Continuity.  
door closed).  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
Check the con-  
nection between  
CN1 connector  
and PCB  
Continuity  
Connect them  
tightly.  
No continuity  
Loose connection.  
assembly.  
Check fan motor.  
Check oven lamp.  
Abnormal  
Abnormal  
Defective fan motor.  
Defective oven lamp.  
Replace fan motor.  
Replace oven lamp.  
2. Fan motor or  
oven lamp do  
not turn on.  
Normal  
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.  
CONDITION  
CHECK  
RESULT  
CAUSE  
REMEDY  
Lower than 90% of  
rating voltage.  
Decrease in power  
source voltage  
with load.  
Suggest customer  
contact local  
electric power  
utility co. or  
qualified  
Output is low  
Check the  
power source  
voltage.  
Normal  
electrician.  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
Disconnect the  
wire leads from  
relay 2 and  
check on and off  
time with  
Abnormal  
Normal  
multitester.  
Measure the  
output power.  
Defective  
magnetron.  
Replace  
magnetron.  
Abnormal  
NOTE : Simple test of power output-conducted by heating one liter water for one min. if available.  
Minimum 8.5°C temperature rise is normal condition.  
-28-  
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(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.  
(Display operates properly)  
CONDITION  
CHECK  
RESULT  
CAUSE  
REMEDY  
No microwave  
oscillation.  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
Disconnect the  
wire leads from  
relay 2 and  
check continuity  
of relay 2.  
No continuity.  
Continuity.  
(Operate the unit)  
Check high vol-  
tage transformer  
Defective high  
voltage  
transformer.  
Replace high  
voltage  
transformer.  
Abnormal  
Normal  
Check high vol-  
tage capacitor.  
Defective high  
voltage capacitor.  
Replace high  
voltage capacitor.  
Abnormal  
Normal  
Check high vol-  
tage diode.  
Defective high  
voltage diode.  
Replace high  
voltage diode.  
Abnormal  
Normal  
Check  
magnetron.  
Defective  
magnetron.  
Replace  
magnetron.  
Abnormal  
NOTE : • 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.  
• When removing the magnetron, be sure to install the magnetron gasket in the correct position  
and in good condition.  
Defective PCB  
assembly.  
Replace PCB  
assembly.  
Output is full power  
when you set lower  
power level.  
Disconnect the  
Abnormal.  
wire leads from  
relay 2 and check  
continuity relay 2.  
(Operate the unit)  
-29-  
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#EV#  
EXPLODED VIEW  
INTRODUCTION  
SENSOR  
OUTER CASE  
INTERIOR  
BASE PLATE  
LATCH BOARD  
DOOR  
CONTROL PANEL  
-30-  
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#EV#  
DOOR PARTS  
1013  
1005  
1004  
1002  
1000  
1003  
1001  
1006  
1007  
-31-  
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#EV#  
CONTROLLER PARTS  
2004  
2381  
2002  
2006  
W106  
2000  
-32-  
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#EV#  
OVEN CAVITY PARTS  
W103  
3001  
3003  
3034  
W107  
3002  
3009  
3008  
W105  
-33-  
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#EV#  
LATCH BOARD PARTS  
W102  
4001  
4002  
4000  
4003  
4002  
4004  
-34-  
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#EV#  
INTERIOR PARTS  
W101  
5014  
5010  
5001  
5016  
3006  
5041  
5012  
W109  
W208  
5003  
5007  
W110  
W109  
W101  
5000  
3007  
W101  
5002  
5015  
5009  
5006  
W208  
W109  
9000  
W101  
5018  
-35-  
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#EV#  
BASE PLATE PARTS  
5008  
6000  
6001  
6007  
W101  
W108  
-36-  
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#EV#  
SENSOR PARTS  
W108  
W136  
5011  
5004  
-37-  
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P/NO: MFL30502909  
Printed in Korea  
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