Kenmore 721.80602500 Microwave Charcoal Filter Screen Owner’s Manual
- July 10, 2024
- Kenmore
Table of Contents
721.80602500 Microwave Charcoal Filter Screen
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Specifications:
- Model: Kenmore 721.80603500
- Division: 22
- Type: Microwave Hood Combination
- Release Date: May, 2005
Product Usage Instructions:
Safety Precautions:
Before using the microwave, ensure to follow these safety
precautions:
-
Do not operate the oven with the door open.
-
Check safety features like interlock operation, proper door
closing, seal condition, hinges, and latches before use. -
Inspect magnetron, waveguide, and cavity for proper alignment
and connections. -
Any malfunctioning components should be repaired or replaced by
qualified personnel. -
Perform a Microwave leakage check before using the oven.
Installation:
Follow these steps for installation:
- Plug the power supply cord into a 120V AC, 60Hz, single-phase
power source with a capacity of at least 20 amperes.
FAQ:
Q: Is it safe to operate the microwave oven without a microwave
energy absorbing load attached?
A: No, never operate the device without a microwave energy
absorbing load attached as it can lead to unsafe conditions.
Q: Can I look into an open waveguide or antenna while the
device is energized?
A: No, it is advised to never look into an open waveguide or
antenna while the device is energized to avoid exposure to
microwave radiation.
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MODEL 721.80602 721.80603 721.80604 721.80609 721.80513
DIVISION 22
BASIC FIELD MANUAL FOR
MICROWAVE HOOD COMBINATION
MODEL 721.80602500
721.80603500 721.80604500 721.80609500 721.80513600
May, 2005
CAUTION
WARNING TO SERVICE TECHNICIANS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a. Do not operate or allow the oven to be operated with the door open.
b. Make the following safety checks on all ovens to be serviced before
activating the magnetron or other microwave source, and make repairs as
necessary; (1) Interlock operation, (2) proper door closing, (3) seal and
sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening
of hinges and latches, (5) evidence of dropping or abuse.
c. Before turning on microwave power for any service test or inspection within
the microwave generating compartments, check the magnetron, wave guide or
transmission line, and cavity for proper alignment, integrity, and
connections.
d. Any defective or misadjusted components in the interlock, monitor, door
seal, and microwave generation and transmission systems shall be repaired,
replaced, or adjusted by procedures described in this manual before the oven
is released to the owner.
e. A Microwave leakage check to verify compliance with the Federal performance
standard should be performed on each oven prior to release to the owner.
· Proper operation of the microwave ovens requires that the magnetron be
assembled to the wave guide 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.
· Routine service safety procedures should be exercised at all times.
· Untrained personnel should not attempt service without a thorough review of
the test procedures and safety information contained in this manual.
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
INSTALLATIONS ……………………………………………………………………………………………………………………………….. 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
TROUBLESHOOTING……………………………………………………. 7-15 A.TEST PROCEDURES
……………………………………………………………………………………………………………………. 7-15 B.CHECKOUT PROCEDURES
………………………………………………………………………………………………………….. 7-20 C.TROUBLESHOOTING
…………………………………………………………………………………………………………………… 7-22 EXPLODED VIEW
……………………………………………………………………………………………………………………………… 8-1 REPLACEMENT PARTS LIST
…………………………………………………………………………………………………………….. 8-8
SPECIFICATIONS
Rated Power Consumption …………………………..1700W maximum (Microwave oven+Cook top
lamps+Ventilation fan) Microwave Output ………………………………………..1100W (IEC60705)
Frequency ………………………………………………….2450 MHz ± 50 MHz Power Supply
……………………………………………..120 VAC, 60 Hz Rated Current …………………………………………….14.5 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
Thermostat: Open at 150 °C ± 5 °C
Close at 0 °C ± 5 °C ………………………………………………………………….Oven Thermostat: Open at 110 °C
± 5 °C
Close at 0 °C ± 5 °C ………………………………………………………………….Fuse (20A)
………………………………………………………………….Primary Interlock Switch
………………………………………………………………….Secondary Interlock Switch
………………………………………………………………….Interlock Monitor Switch Magnetron
………………………………………………….2M282J (Toshiba) Cook top Lamp ……………………………………………130 V, 35
W (Halogen) Cavity Lamp ……………………………………………….125 V, 30 W or 40 W Timer
…………………………………………………………Digital, up to 99 min.99 sec. (in each cooking stage)
Tray …………………………………………………………..Tempered Safety Glass Overall Dimensions
……………………………………..2915/16″(W)x167/16″(H)x153/8″(D) Oven Cavity Size
………………………………………..231/2″(W)x103/16″(H)x141/2″(D) Effective Capacity of Oven
Cavity ………………….2.0 Cu.ft. Accessories ………………………………………………..Owner’s Manual &
Cooking Guide, Installation Manual, ………………………………………………………………….Exhaust Adapter,
Exhaust Damper, Mounting Kit and Filter, ………………………………………………………………….Rotating
Ring Assembly, Glass Tray, Metal Rack.
SWITCH CHART
SWITCH MODE
PRIMARY INTERLOCK
SWITCH
CONDITIONS
DOOR OPEN DOOR CLOSED
COM NO OPEN CLOSE
NOTE: Use the above switch chart with circuit diagram on page 5-1.
SECONDARY INTERLOCK
SWITCH
COM NO OPEN CLOSE
INTERLOCK MONITOR SWITCH
COM NC CLOSE OPEN
1-1
CAUTIONS
Unlike other appliances,the microwave oven is high-voltage and high-current
equipment. Though it is free from danger in ordinary use, extreme care should
be taken during repair.
· 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.
· Remove your watches whenever working close to or replacing the 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.
MICROWAVE RADIATION
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. 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
MAGNETRON CHASSIS GROUND
FILAMENT TERMINALS
MAGNETRON
THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL.
2-1
INSTALLATIONS
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 at least 20 amperes.
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
OPERATING INSTRUCTIONS
CONTROL PANEL
1
3
2
4
6
5
7
8
10
9
11
12
13
15
14
20
23
24
16
22
17
21
19
18
25
27
26
4-1
CONTROL PANEL INSTRUCTIONS
1. Display. The display includes a clock and indicators to tell you time of
day, cooking time settings, cook powers, quantities, weights and cooking
functions selected.
2. Sensor Popcorn. Touch this pad to pop popcorn with the sensor feature. The
oven’s sensor will tell the oven how long to cook depending on the amount of
humidity it detects from the popcorn.
3. Sensor Cook. Touch this pad to cook microwavable foods without entering a
cook time or power.
4. Sensor Reheat. Touch this pad to reheat microwavable foods without
entering a cook time or power.
5. Poultry. Touch this pad to cook chicken wings, chicken nuggets, Spicy
Chicken and Mexican Chicken.
6. Soften. Touch this pad to soften Butter, Ice Cream, Cream Cheese and
Frozen Juice.
7. Melt. Touch this pad to melt Butter/Margarine, Chocolate, Cheese and
Marshmallows.
8. Auto Defrost. Touch this pad followed by Number Pads to thaw frozen meat
by weight.
9. Time Defrost. Touch this pad to defrost most other frozen foods.
10. Express Defrost. Touch this pad to express defrost. “GROUND BEEF 1.0 LBS
TOUCH START” will appear in the display.
11. Number Pads. Touch number pads to enter cooking times, cook powers,
quantities, weights, or food categories.
12. Cook Time. Touch this pad followed by Number Pads to set a cooking time.
13. Power. Touch this pad after the cook time has been set, followed by a
Number Pad to set the amount of microwave energy released to cook the food.
The higher the number, the higher the microwave power or “cooking speed.”
14. More. Touch this pad to add 10 seconds of cook time each time you press
it.
15. Less. Touch this pad to subtract 10 seconds of cook time each time you
press it.
16. Option. Touch this pad to change the oven’s default settings for sound,
clock, display speed and defrost weight.
17. Turntable On/Off. Touch this pad to turn off the turntable. “T/TABLE OFF”
will appear in the display.
18. Clock. Touch this pad to enter the correct time of day.
19. Kitchen Timer. Touch this pad to set the kitchen timer.
20. Add 30Sec. Touch this pad to cook for 30 seconds at 100% cook power, or
to add extra times at the set cook power to your cooking cycle.
21. Hold Warm. Touch this pad to keep hot, cooked foods safely warm in your
oven for up to 90 minutes. Hold Warm can be used by itself, or it can
automatically follow a cooking cycle.
22. Favorite. Touch this pad to recall one cooking instruction previously
programmed into memory.
23. START. Touch this pad to start a function. If you open the door after the
oven begins to cook, retouch START.
24. STOP/Clear. Touch this pad to erase an incorrect command, cancel a
program during cooking, or to clear the Display.
25. Fan ( ) On/Off. Touch this pad to turn the fan on or off.
26. Fan ( ) 5 Speed. Touch this pad to choose one of 5 fan speeds.
27. Light ( ) High/Night/Off. Touch this pad to turn the light on high, night
or off.
NOTE: If you try to enter incorrect instructions, you will not hear any tones.
Touch STOP/Clear and re-enter the instructions.
4-2
OVERALL CIRCUIT DIAGRAM
SCHEMATIC DIAGRAM
L.V.TRANSFORMER
RY1 MAIN RELAY RY2 C/TOP LAMP HIGH RELAY RY3 C/TOP LAMP LOW RELAY
RY5 VENT FAN ON/OFF RELAY
SCR1 VENT FAN
5 LVL RY6 TURNTABLE ON/OFF RELAY
3 TAP POWER RELAY
CN3 1 23 BK RD WH
OVEN THERMOSTAT
WH
WH N
L BK
BK
CN1 1
3 4 5
RY7 POWER RELAY
WH 8
9 SECONDARY SWITCH
11 PK
12 BL
TAP 3
BL
BK
YL O.L
YL
F.M
PK
T.T.M
WH
RD RD
BL 1 2 3 4 5 6
BK BL
RD
C YL
V.M
BK
M.G.T THERMOSTAT
BN
C.L
BK
21 BK
PRIMARY SWITCH
RD
BN
MONITOR SWITCH RD RD
TAP 2
TAP BL 1 WH
BN
H.V. TRANSFORMER
RS. RC.
THERMISTOR
ABSOLUTE HUMIDITY SENSOR
H.V. CAPACITOR H.V.DIODE
F
FA MAGNETRON
BL
WH YL BN
BK PK 89
CONTROL MODULE
PK BL
WH RD BK
12 PIN CONNECTOR(CN1)
3 PIN(CN3) CONNECTOR (FOR SENSOR)
5-1
WIRE COLORS
MATRIX CIRCUIT FOR TOUCH KEY BOARD
KEY MATRIX
1
2
3
4
5
6
7
1
2
3
4
5
8 N.C
Cook Favorite Time Recipe
N.C
9
Vent Fan Vent Fan Light On/Off 5 Speed High/Night/Off
Poultry
10 Popcorn
Cook
Reheat
Auto Defrost
11 Option
12
Hold Turntable Kitchen Warm On/Off Timer
Power
N.C
STOP/ Clear
START
13
N.C
N.C Add 30 Sec. Clock
8
6 N.C Soften Time Defrost More 9
7 N.C Melt Express Defrost Less 0
5-2
GENERAL INFORMATION FOR SERVICE
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.
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. Two short and a 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.
FEATURES AND SPECIFICATIONS FEATURES
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) 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 0W to 1100W 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 (Include Defrost) can be changes from one
cooking stage to another. This is made possible with the memory function of
the microprocessor.
6-1
SERVICE INFORMATION
PRECAUTIONS AND REPAIR SERVICE TIPS
PRELIMINARY
A. SINCE NEARLY 4000 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD
BE CARRIED OUT WITH GREAT CARE. 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.
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.
(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 be below the limit of 5 mW/cm2 . (All
service adjustments should be made for minimum microwave energy leakage
readings).
(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) 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. 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).
(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.
The unit must not be operated with any of the above components removed or by-
passed.
7-1
MICROWAVE LEAKAGE TEST
CAUTIONS
· Be sure to check microwave leakage prior to servicing the oven if the oven
is operative prior to servicing.
· 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. NOTE: Address on
CDRH Office of Compliance (HFZ-312) Center for Devices and Radiological Health
1390 Piccard Drive Rockville, Maryland 20850
· The service personnel should check all surface and vent openings for
microwave emission testing.
· 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/cm2. sq. And always start measuring of an unknown field to assure
safety for operating personnel from radiation leakage. NOTE: The standard is
5mW/cm2. sq. while in the customer’s home. 1mW/cm2. sq. stated here is
manufacturer’s own voluntary standard for units in customer’s home.
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 plastic), inside diameter:
approx. 8.5 cm (3 1/2 in.)
· Glass thermometer: 100°C or 212°F (1 deg scale)
MEASURING MICROWAVE ENERGY LEAKAGE
· 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 oven.
· 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 and
electromagnetic radiation monitor by holding the probe perpendicular to the
surface being measured.
Move probe along shaded area.
Probe scanning speed Less than 2.5 cm/sec. ( 1 in/sec)
7-2
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. –
Around the magnetron – The waveguide
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.
(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 1 mW/cm2
NOTE WHEN MEASURING
(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. (3) The test probe must be held with the grip portion of the handle. A
false reading may result if the operator’s 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 horizontally along the oven
surface, this may possibly cause probe damage.
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 1 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.
(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
approximately 7.6″ (190mm).
(3) The oven and the empty vessel are at ambient Temperature(T0)prior to the
start of the test.
(4) The initial temperature (T1) of the water is (10±1)°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.
(5) The time t for the temperature of the water to rise by a value T of
(10±1)°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.
(6) The microwave power output P in watts is calculated from the following
formula :
P = 4.187 Mw(T2T1)+0.55Mc(T2T0) t
is measured while the microwave generator is operating at full power.
Magnetron filament heat-up time is not included. (about 3 sec) (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.
Where P is the microwave power output, in watts: Mw is the mass of the water,
in grams: Mc is the mass of the container, in grams: T0 is the ambient
temperature, in °C: T1 is the initial temperature of the water, in °C: T2 is
the final temperature of the water, in °C: t is the heating time in seconds,
excluding the magnetron filament heat-up time.
WATER LOAD
TURNTABLE 7-3
DISASSEMBLY INSTRUCTIONS
IMPORTANT NOTES:
UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS,
REPLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WHEN 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 POWER AND CONTROL CIRCUIT BOARD (Figures 1, 2 and 3)
(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 connectors
(CN1, CN3) and wire
leads (3 Tap Power Relay, RY7) from the circuit board.
Screw
Control Panel
Circuit Board
(4) Remove 3 screws securing the circuit board.
Circuit Board
Figure 2 (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.
(CN3) 3 Tap Power Relay
(RY7) Power Transformer
(CN1)
Figure 1
Control Bracket FPC Connector(S1)
Circuit Board
7-4
Figure 3
HOW TO REMOVE THE F.P.C. CONNECTOR
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.
Plastic fastener
F.P.C. Connector
Terminal socket Figure 4
Plastic fastener Hook
Holes
HOW TO INSERT 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 (3) Lock the level of the
plastic fastener into the hook of the terminal socket securely by releasing
the fingers. (Figure 7)
Plastic fastener Hook
Holes
F.P.C. Connector
Terminal socket Figure 6
Plastic fastener
F.P.C. Connector
Terminal socket Figure 5
7-5
Terminal socket
Figure 7
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
two 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
four screws of the rear cavity. (6) Remove the outcase with disconnecting
power cord connector.
Mount, All
Power cord
Door
Vent Grille
Controller Figure 8
7-6
Mounting Plate
Out Case
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 PROCEDURES” on page 7-12.
Latch Board
Primary Interlock Switch
RD(from P.C.B) RD(from Fan Motor) BK(from Cooktop lamp) BK(from MGT
THERMOSTAT)
Monitor Interlock Switch
WH(from H.V.T) BN(from Turntable Motor) RD(from P.C.B)
Secondary Interlock Switch
PK(from P.C.B) BL(from P.C.B)
Figure 9
7-7
Latch Board
Primary Interlock Switch
Interlock Monitor Switch
Secondary Interlock Switch
Figure 10
WIRE COLOR
SYMBOL COLOR WH WHITE BK BLACK BR BROWN RD RED YL YELLOW PK PINK BL BLUE GY
GRAY GN GREEN N.P. Not Provided
D. REMOVING MAGNETRON
(Figures 11 Through 12) (1) Remove the vent grille by loosening two screws.
(Figure 11) (2) Remove the outcase. See page 7-6. (3) Remove the controller
ASS’Y. (4) Disconnect the leadwire. (5) Remove a screw securing the magnetron
guide
the the magnetron. (6) Remove four tap tite screws securing the
magnetron to the wave guide. (7) Disconnect the leadwire. (8) Remove the
magnetron VERY CAREFULLY.
NOTES: · 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.
· 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.)
E. REMOVING STIRRER FAN
(Figures 13 and 14) (1) Remove one rivet ASS’Y securing it to the oven
upper plate by using knife blade. (2) Rotate slightly and pull out the stirrer
fan cover. (3) Remove the stirrer fan.
Mount, AII
Figure 13
Vent Grille
Figure 11
Figure 12
Magnetron 7-8
Figure 14
F. REMOVING DOOR (Figure 15)
(1) Remove the vent grille by two screws securing it to the outcase loosening.
(2) Lift up and draw the door.
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)
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.
Figure 15
G. DISASSEMBLING DOOR (Figure 16)
(1) Remove the dielectric choke by using knifeblade 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.
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 17)
(2) Remove MOUNT ALL loosening one screw loosening one screw securing the
ventilation Motor and back plate. (See Figure 18-a)
Figure 17
Door Screen
Figure 16 7-9
Mount, All Figure 18-a
(3) Carefully pull the ventilation motor ASS’Y out ofthe microwave oven. (See
Figure 18-b)
Figure 18-b
J. REMOVING THE TURNTABLE MOTOR
(1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with
a slotted screwdriver. (Figure 19) (3) Remove the base plate by removing 8
screws
securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from
the turntable motor
terminals. (5) Remove 1 screw securing the turntable motor to the
oven cavity ASS’Y. (Figure 21)
NOTES: · Remove the leadwire from the turntable motor VERY
CAREFULLY. · Be sure to grasp the connector not the wires when
removing.
Figure 19
7-10
Figure 20 Wire Leads
Turntable Motor
Figure 21
K. REPLACING THE HUMIDITY SENSOR
(1) Remove the sensor by removing 1screw securing it to the air duct. (See
Figure 22)
(2) Mount the new humidity sensor to the air duct.
Figure 22
7-11
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 To avoid possible exposure to microwave energy leakage,
adjust the door latches and interlock switches, using the following procedure.
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. Mounting of the primary/monitor/secondary switches to the latch
board.
Latch Board
Primary Interlock Switch
CHECK THE DOOR LATCH AND SWITCH CLOSING.
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 23-a.
(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.
NOTE: 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.
Interlock Monitor Switch
Secondary Interlock Switch
Figure 23-a
LATCH
ADJUST THE LATCH AND SWITCH CLOSING
(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). Hold the latch board tightly in this position until you check
the sequence of the switches in steps 5 and 6.
0-1/64″ LATCH BOARD
Figure 23-b
0-1/64″
7-12
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:
-Primary Interlock Switch -Secondary Interlock Switch -Interlock Monitor Switch
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) 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
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.
7-13
INTERLOCK CONTINUITY TEST
A. PRIMARY INTERLOCK SWITCH TEST
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 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. When the primary switch operation is abnormal, make the necessary
adjustment or replace the switch only with the same type of switch.
B. SECONDARY INTERLOCK SWITCH TEST
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. NOTE: After
repairing the door or the interlock system, it is necessary to do this
continuity test before operating the oven.
COMPONENTS
SWITCHES (Wire leads removed)
TEST PROCEDURE
Check for continuity of the switch with an Ohm-meter
Primary Switch
NO COM
RESULTS
Door open
Door closed
Monitor Switch
NC COM
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
TEST AND CHECKOUT PRECEDURES 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 LEAD WIRES 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 TRANSFORMER
FILAMENT WINDING
TEST
SECONDARY WINDING
RESULTS
MAGNETRON
PRIMARY WINDING
1. Remove wire leads. 2. Measure resistance. (ohm meter scale: Rx1)
· Primary winding High Low
· Secondary winding · Filament winding 3. Measure resistance. (ohm meter
scale: Rx1000) · Primary winding to ground · Filament winding to ground
Approx. 0.2 to 0.5 ohms Approx. 0.2 to 0.5 ohms Approx. 50 to 120 ohms 0 ohm
Normal: Infinite Normal: Infinite
Antenna Gasket
Chassis
Filament
1. Remove wire leads. Install the magnetron seal in the correct position.
Check that the seal is in good condition.
2. Measure resistance. (ohm meter scale: Rx1) · Filament terminal
3. Measure resistance. (ohm meter scale: Rx1000) · Filament to chassis
7-15
Normal: Less than 1 ohm Normal: Infinite
COMPONENTS CAPACITOR
TEST 1. Remove wire leads. 2. Measure resistance. (ohm meter scale: Rx1000)
· Terminal to terminal
· Terminal to case
RESULTS
Normal: Momently indicates several ohm, and then gradually returns to infinite
Normal: Infinite.
DIODE Some inexpensive ohm meters may indicate infinite resistance in both directions.
1. Measure continuity. Forward. (ohm meter scale: Rx1000)
2. Measure continuity. Reverse. (ohm meter scale: Rx1000)
Normal:Continuity. Abnormal: Infinite.
Normal: Infinite. Abnormal: Continuity.
RELAY 7 FAN MOTOR
1. Measure continuity. (ohm meter scale: Rx1)
2. Remove the lead wires and operate oven at power level 1 through power
level 10.
1. Remove wire leads.
2. Measure resistance. (ohm meter scale: Rx1)
BA C
Power Level
Open
1 4 Sec
2 6 Sec
3 8 Sec
4 10 Sec
5 12 Sec
6 14 Sec
7 16 Sec
8 18 Sec
9 20 Sec
10 22 Sec
Close
18 Sec 16 Sec 14 Sec 12 Sec 10 Sec 8 Sec 6 Sec 4 Sec 2 Sec 0 Sec
Normal: Approximately Terminal A C : 35 to 50 ohms Terminal A B : 5 to 15 ohms Abnormal: Infinite or several.
7-16
COMPONENTS VENTILATION MOTOR
TEST
1. Remove lead wires. 2. Measure resistance.
(ohm meter scale:Rx1)
RESULTS
Normal: Approximately 20 to 40 ohms Abnormal:Infinite
TURNTABLE MOTOR
1. Remove wire leads. 2. Measure resistance.
(ohm meter scale: Rx1000)
Normal: Approximately 2.5 to 3.5 Kohms Abnormal: Infinite or several.
ABSOLUTE HUMIDITY SENSOR
1. Disconnect sensor connector from micom computer board.
2. Measure resistance terminal to terminal (ohm meter scale: R X 1000)
Normal: Approximately BK-RD: 6.0 Kohms RD-WH: 3.0 Kohms BK-WH: 3.0 Kohms Abnormal: Infinite or approx. 0 ohm
1
BK
2
RD
3
WH
7-17
COMPONENTS TOUCH KEY BOARD
TEST
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.
MATRIX CIRCUIT FOR TOUCH KEY BOARD
CONNECTOR(KEY CON)
1
2
3
4
5
6
7
1
2
3
4
5
8
N.C
Cook Favorite Time Recipe
N.C
9
Vent Fan Vent Fan Light On/Off 5 Speed High/Night/Off
Poultry
10 Popcorn
Cook
Reheat
Auto Defrost
11
Option 12
Hold Turntable Kitchen Warm On/Off Timer
Power
N.C
STOP/ Clear
START
13
N.C
N.C Add 30 Sec. Clock
8
6 N.C Soften Time Defrost More 9
7 N.C Melt Express Defrost Less 0
RESULTS
When When not Resistance touched touched
value Less than More than 400 ohms 1 mega ohm
FPC CONNECTOR Top
1 2 3 4 5 6 7 8 9 10 11 12 13
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.
7-18
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.
Fuse blows immediately after the door is opened.
Improper operation of the primary interlock, secondary interlock switches and/or the interlock monitor switch.
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 all
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
INTERLOCK ADJUSTMENT PROCEDURES on page
7-12 when the primary interlock, secondary interlock switches and/or the
interlock monitor switches are adjusted or replaced.
7-19
(2)CHECKOUT PROCEDURES FOR RELAY.
-PROBLEM (A)FAN motor turns on without touching START key
when the door is closed.
NO
YES
GOOD
Remove the mate connector of I/O CON from the circuit board. Does the unit still operate?
NO
YES
Replace the circuit board
Defective Wire Assembly
-PROBLEM (A)-Oven lamp turns on without touching START key
when the door is closed.
NO
YES
GOOD
Remove the mate connector of I/O CON from the circuit board. Does the unit still operate?
NO
YES
Replace the circuit board
Defective Wire Assembly
Replace Wire Assembly
Replace Wire Assembly
-PROBLEM (B)FAN motor turns on When the door is closed and
START key is touched.
YES
NO
GOOD
Measure the voltage at pin NO. 1, 3 of CN1 Voltage reading:120 V AC
NO
YES
Replace the circuit board
Defective FAN motor
-PROBLEM (B)Oven lamp turns on When the door is closed and
START key is touched.
YES
NO
GOOD
Measure the voltage at pin NO. 1, 3 of CN1 Voltage reading:120 V AC
NO
YES
Replace the circuit board
Defective Oven lamp
Replace FAN motor.
7-20
Replace Oven lamp
(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board.
-
Check the input current. If the input current is more than 20A, check the magnetron and wiring. If the input current is less than 0.5 A, there is no input to the H.V.T.
-
The start function fails to operate but the high voltage Systems, the interlock switches, the door sensing and the relay check good.
-
The unit with a normal relay continuously operates. 4) The buzzer does not sound or continues to sound.
-
Some segments of one or more digits do not light up, or they continue to light up, or segments light when they should not.
-
Wrong figures appear. 7) The figures of all digits. 8) 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.
7-21
7-22
C. TROUBLE SHOOTING
Before following this troubleshooting read TRIAL OPERATION on page 6- 1.
· DISPLAY Problems, A thru C
· HELP UP Problems, D thru E
· BUZZER Problems, F
PROBLEM – A: “PLEASE SET TIME OF DAY” does not appear in display window when power supply cord is plugged into wall outlet.
1
Check: 1. POWER SUPPLY 2. FUSE (See “CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7- 19)
3. OVEN CAVITY THERMOSTAT
BL WH
0 120
120V
Measure voltage between pin 1 and pin 3 of connector CN1.
0 120
Voltage incorrect
PROBLEM – B: Display does not show correct numbers and/ or correct indications
when programmed.
1
Replace circuit board
Correct connections
Measure resistance of touch key board after removing connector S1. (See page 7-5 and 7-18)
Normal resistance
Check contact of connector S1
Resistance incorrect
Replace touch key board.
Normal circuit board
Normal resistance
Contact ok
Poor contact
Normal touch key board
Replace circuit board
Normal circuit board
Correct seating
Normal contact
Runs Runs Runs Runs Runs
7-23
PROBLEM – E: Display does not start countdown when START key is touched.
1 Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)
Continuity OK
Check continuity of connector CN1 between Pin 11(PK) and pin 12(BL) when the door is closed
No continuity
PROBLEM – D: Unit operation seems to be normal but no heating is produced in
oven load.
1 Check: 1. AIR VENTS
Normal operation
Check contact of connector S1
Contact OK
Poor Correct
Replace Circuit board
Correct seating
Adjust or replace door sensing switch.
Normal Secondary switch
Normal circuit board
Normal contact
Measure resistance of H.V.capacitor (see page 7-16)
Resistance incorrect
33
Normal resistance
Replace H.V.C.
Normal H.V.C.
Replace
Normal magnetron
Check operation of fan motor when START key is touched.
No operation
Measure resistance
of fan motor Terminal A~C: 35 to 50 ohms
Terminal A~B: 5 to 15 ohms
Resistance incorrect
33
Normal resistance
Replace fan motor
Replace circuit board
Normal fan motor
Normal circuit board
Runs Runs Runs
Runs Runs Runs Runs
PROBLEM – E: Unit does not heat up even if display counts down when START key is touched for HIGH POWER cooking.
1
Check: 1. PRIMARY AND SECONDARY INTERLOCK SWITCHES 2. THERMOSTAT
Check the contact of relay 7 (see page 7-16)
2
NO continuity
Contact OK
Replace circuit board
Normal circuit board
Check contact of connector
Poor contact Contact OK
Correct seating
Replace circuit board
Normal contact
Normal circuit board
Runs Runs Runs
7-24
Resistance incorrect
Replace H.V.T. Normal H.V.T.
Runs
Measure resistance of H.V.Transformer (see page 7-15)
Normal resistance
Resistance incorrect
Replace H.V.C.
Normal H.V.C.
Runs
Check the continuity of H.V.C. (see page 7-16)
Normal
Check the
Abnormal
Replace H.V.D.
Normal
Runs
resistance
continuity of H.V.D.
H.V.D.
(see page 7-16)
Normal
Replace
Normal
Runs
Magnetron
Magnetron
PROBLEM – F: No buzzing when touching the key, between stages or at end of
cooking
1
Check normal
Replace
Normal
Runs
operation
circuit board
circuit board
circuit board
PROBLEM – G: Ventilation fan does not operate when VENT ON/OFF key is touched.
1 Check: 1. POWER SUPPLY
2. FUSE
NO
Replace
Runs
contact
magnetron thermostat
and oven thermostat
Check the contact of magnetron thermostat
Poor contact
Correct seating
Normal contact
Runs
and oven thermostat
Contact OK
Check contact of connector
Contact OK
Replace
Normal
Runs
circuit board
circuit board
7-25
NO runs
Replace
Normal
Runs
ventilation
ventilation
EV
EXPLODED VIEW
MODEL 721.80602500 721.80603500 721.80604500 721.80609500 721.80513600
DOOR PARTS
1005
1000
1002
1011
For Model
1381
: 721.80603 721.80513
1004
1009
1008 W109
1007
1006
1003
8-1
EV
CONTROLLER PARTS
For Model: 721.80602
721.80604
2004
721.80609 W106 2002
2000
2381
For Model: 721.80603
721.80513
2004
2006 2008 * 07
W106
2381
8-2
2006 2008 * 07
EV
OVEN CAVITY PARTS
For Model 721.80602 721.80604
For Model 721.80603 721.80609 721.80513
W138 W142
3010
W108 3031 W109
3024
3029
3001
3036 6000
3018
3032
W202 3005 W178
5382 3037
3011
3025 3026 8-3
W121
EV#
LATCH BOARD PARTS
4001
W102
4000 4002
4004
4003 4002
8-4
EV#
INTERIOR PARTS (I)
3012 3034
3002 3008
3007 5023
5009
W101
5002
5000
W101
5018 5049
5024
5058 5043
3009 5044
3004
W109 W105
8-5
5008
W101
5051 W109
EV
W136 5027
5011
INTERIOR PARTS (II)
W110
5016
3027 W109
5012
W140
W136 5001
5041
5045
5412
5006 5010
5015
5038
W109
5037
5007 W204 5014
W101
W109 8-6
EV#
INSTALLATION PARTS
6008
6011 6010
6009
VINYL BAG
OWNERS MANUAL
*01
SERVICE
MANUAL
*02 INSTALLATION
MANUAL
*04
COOKING GUIDE LABEL
*05
UPPER
*06-1
WALL
*06-2
TEMPLATE
TEMPLATE
8-7
P/NO : 3828W5S6166
Printed in Korea
References
- Repair Your Grill: Shop Replacement Parts for 24,880 Models
- Kenmore Microwave Parts - Select From 532 Models
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