Kenmore 721.80882 User manual

BASIC SERVICE MANUAL
MODEL 721. 64682/721. 64683
AUGUST, 2003
FOR
MICROWAVE HOOD COMBINATION
TECHNICAL FLASH
R
721. 64684/721. 64689
721. 80882/721. 80883
721. 80884/721. 80889

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 oven require that the magnetron be a embled to the
wave guide and cavity. Never operate the magnetron unle it i properly in talled.
•Be ure that the magnetron ga ket i properly in talled around the dome of the tube whenever
in talling the magnetron.
•Routine ervice afety procedure hould be exerci ed at all time .
•Untrained per onnel hould not attempt ervice without a thorough review of the te t
procedure and afety information contained in thi manual.

FOREWORD
Read thi Manual carefully. Failure to adhere to or ob erve the information in thi Manual may re ult in expo ing
your elf to the Microwave Energy normally contained within the oven cavity.
TABLE OF CONTENTS
(Page)
SAFETY PRECAUTIONS ......................................................................................................... In ide 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..................................................................................................... 7-19
C. TROUBLESHOOTING............................................................................................................... 7-22
EXPLODED VIEW .......................................................................................................................................... 8-1
MODEL 721. 64682/721. 64683
721. 64684/721. 64689
721. 80882/721. 80883
721. 80884/721. 80889

1-1
Rated Power Con umption 1400W maximum (Microwave oven+Cook top lamp +Ventilation fan)
Microwave Output 1200W (IEC 60705)
Frequency 2,450 MHz ± 50 MHz
Power Supply 120 VAC, 60 Hz
Rated Current 12 Amp. (Microwave oven+Cook top lamp +Ventilation fan)
Magnetron Cooling Forced Air Cooling
Rectification Rectification Voltage Double Half-Wave
Door Sealing Choke Sy tem
Safety Device Thermo tat:
Open at 110 °
C±5 ° C
Clo e at 0
°
C±5 ° C
Fu e(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor Switch
Inverter P1-1019, 120 V
Magnetron 2M261
Cook top Lamp 120 V, 20 W (Halogen)
Cavity Lamp 125 V, 30 W
Timer Digital, up to 99 min. 99 ec. (in each cooking tage)
Tray Tempered Safety Gla
Overall Dimen ion 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.
Acce orie Owner’ Manual & Cooking Guide, In tallation Manual,
Exhau t Adapter, Exhau t Damper, Mounting Kit and Filter,
Rotating Ring A embly, Gla Tray, Metal Rack, Defro t Plate.
SWITCH CHART
SPECIFICATIONS
NOTE: U e the above witch chart with circuit diagram on page 5-1.
PRIMARY SECONDARY INTERLOCK
INTERLOCK INTERLOCK MONITOR
SWITCH SWITCH SWITCH
COM COM COM
NO NO NC
SWITCH MODE
CONDITIONS
DOOR OPEN
DOOR CLOSED

2-1
CAUTIONS
• DO NOT operate on a 2-wire exten ion cord during
repair and u e.
• NEVER TOUCH any oven component or wiring during
operation.
• BEFORE TOUCHING any part of the oven, alway
remove the power plug from the outlet.
• Remove your watche whenever working clo e to or
replacing the Magnetron.
• DO NOT touch any part of the control panel circuit. A
re ulting tatic electric di charge may damage thi
P.C.B.
• NEVER operate the oven with no load.
• NEVER injure the door eal and front plate of the oven
cavity.
• NEVER put iron tool on the magnetron.
• NEVER put anything into the latch hole and the interlock
witche area.
• Proper operation of the microwave oven require that
the magnetron be a embled to the waveguide and
cavity. Never operate the magnetron unle it i
properly in talled.
• Be sure that the magnetron gasket is properly
installed around the dome of the tube whenever
installing the magnetron.
Unlike other appliance , the microwave oven i
high-voltage and high-current equipment.
Though it i free from danger in ordinary u e,
extreme care hould be taken during repair.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
MICROWAVE RADIATION
Per onnel hould not be expo ed to the
microwave energy which may radiate from the
magnetron or other microwave generating
device if it i improperly u ed or connection.
All input and output microwave connection ,
waveguide, flange, and ga ket mu t be ecure
never operate the device without a microwave
energy ab orbing load attached.
Never look into an open waveguide or antenna
while the device i energized.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON