Kenmore 721.63682 User manual

BASIC SERVICE MANUAL
MODEL 721. 63682
FEBRUARY, 2003
FOR
MICROWAVE HOOD COMBINATION
TECHNICAL FLASH
R
721. 63683
721. 63684
721. 63689

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 microwa e o ens requires that the magnetron be assembled to the
wa e guide and ca ity. Ne er operate the magnetron unless it is properly installed.
•Be sure that the magnetron gasket is properly installed around the dome of the tube whene er
installing the magnetron.
•Routine ser ice safety procedures should be exercised at all times.
•Untrained personnel should not attempt ser ice without a thorough re iew of the test
procedures and safety information contained in this manual.

FOREWORD
Read this Manual carefully. Failure to adhere to or obser e the information in this Manual may result in exposing
yourself to the Microwa e Energy normally contained within the o en ca ity.
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..................................................................................................... 7-19
C. TROUBLESHOOTING............................................................................................................... 7-22
EXPLODED VIEW.......................................................................................................................................... 8-1
REPLACEMENT PARTS LIST............................................................................................................... 8-8
SCHEMATIC DIAGRAM OF PCB .......................................................................................................... 8-16
PRINTED CIRCUIT BOARD .................................................................................................................. 8-17
PCB PARTS LIST................................................................................................................................... 8-18
MODEL 721. 63682
721. 63683
721. 63684
721. 63689

1-1
Rated Power Consumption 1400W maximum (Microwa e o en+Cook top lamps+Ventilation fan)
Microwa e Output 1200W (IEC 60705)
Frequency 2,450 MHz ± 50 MHz
Power Supply 120 VAC, 60 Hz
Rated Current 12 Amp. (Microwa e o en+Cook top lamps+Ventilation fan)
Magnetron Cooling Forced Air Cooling
Rectification Rectification Voltage Double Half-Wa e
Door Sealing Choke System
Safety De ices Thermostat:
Open at 110 °
C±5 ° C
Close at 0
°
C±5 ° C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor Switch
In erter P1-1019, 120 V
Magnetron 2M261
Cook top Lamp 120 V, 20 W (Halogen)
Ca ity Lamp 125 V, 30 W or 40 W
Timer Digital, up to 99 min. 99 sec. (in each cooking stage)
Tray Tempered Safety Glass
O erall Dimensions 2915/16”(W)x167/16”(H)x153/8”(D)
O en Ca ity Size 231/2”(W)x103/16”(H)x141/2”(D)
Effecti e Capacity of O en Ca ity 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
SPECIFICATIONS
NOTE: Use the abo e switch 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 extension cord during
repair and use.
• NEVER TOUCH any o en components or wiring during
operation.
• BEFORE TOUCHING any parts of the o en, always
remo e the power plug from the outlet.
• Remo e your watches whene er 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 o en with no load.
• NEVER injure the door seal and front plate of the o en
ca ity.
• NEVER put iron tools on the magnetron.
• NEVER put anything into the latch hole and the interlock
switches area.
• Proper operation of the microwa e o en requires that
the magnetron be assembled to the wa eguide and
ca ity. Ne er 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.
Unlike other appliances, the microwa e o en is
high- oltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
MICROWAVE RADIATION
Personnel should not be exposed to the
microwa e energy which may radiate from the
magnetron or other microwa e generating
de ice if it is improperly used or connection.
All input and output microwa e connections,
wa eguide, flange, and gasket must be secure
ne er operate the de ice without a microwa e
energy absorbing load attached.
Ne er look into an open wa eguide or antenna
while the de ice is energized.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON