Kenmore 767. 8714000 User manual

Department 731A Toronto
BASIC SERVICE MANUAL
MODEL 767. 8714000
767. 8814000
767. 8814800
767. 8914000
767. 8914900
767. 8914400
MARCH, 2001
FOR
MICROWAVE OVEN
TECHNICAL FLASH
T.F. 22-453
R

This device is to be serviced only by properly qualified service personnel.
Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be
taken to avoid possible exposure to excessive microwave energy.
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 CSA Standard should be performed on each
oven prior to release to the owner.
SAFETY PRECAUTIONS

(Page)
SAFETY PRECAUTIONS
--------------------------------------------------------------------- Inside front cover
SPECIFICATIONS
-----------------------------------------------------------------------------------------------------
1-1
CAUTIONS
-------------------------------------------------------------------------------------------------------------- 2-1
INSTALLATIONS
------------------------------------------------------------------------------------------------------ 3-1
OPERATING INSTRUCTIONS
------------------------------------------------------------------------------------
4-1
FEATURES ------------------------------------------------------------------------------------------------------------------------ 4-1
CONTROL PANEL
------------------------------------------------------------------------------------------------------------- 4-1
SCHEMATIC DIAGRAM
------------------------------------------------------------------------------------------------------ 4-2
CIRCUIT DESCRIPTION
----------------------------------------------------------------------------------------------------- 4-3
SERVICE INFORMATION ------------------------------------------------------------------------------------------ 5-1
TOOLS AND MEASURING INSTRUMENTS --------------------------------------------------------------------------- 5-1
MICROWAVE LEAKAGE TEST
-------------------------------------------------------------------------------------------- 5-1
MEASUREMENT OF MICROWAVE POWER OUTPUT
----------------------------------------------------------- 5-3
DISASSEMBLY AND ADJUSTMENT
------------------------------------------------------------------------------------- 5-3
INTERLOCK CONTINUITY TEST ------------------------------------------------------------------------------------------ 5-7
COMPONENT TEST PROCEDURE
-------------------------------------------------------------------------------------- 5-8
TROUBLE SHOOTING
------------------------------------------------------------------------------------------------------ 5-11
EXPLODED VIEW ----------------------------------------------------------------------------------------------------- 6-1
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------ 7-1
SCHEMATIC DIAGRAM OF P.C.B.
------------------------------------------------------------------------------ 8-1
PRINTED CIRCUIT BOARD ------------------------------------------------------------------------------------------------- 8-2
P.C.B. PARTS LIST --------------------------------------------------------------------------------------------------- 9-1
CONTENTS

1-1
SPECIFICATIONS
SWITCH CHART
SWITCH MODE
CONDITIONS
DOOR OPEN
DOOR CLOSED
PRIMARY
INTERLOCK
SWITCH
COM
NO
•
SECONDARY
INTERLOCK
SWITCH
COM
NO
•
INTERLOCK
MONITOR
SWITCH
COM
NC
•
NOTE: Use the above switch chart with circuit diagram on page 4-2.
“•” represents the connection of the terminal of each switch.
MODEL NO. 87140 88140/88148 89140/89149/89144
Rated Power Consumption 1,500 W
Output 1,100 W (*IEC 705 Rating standard)
Frequency 2,450 MHz
Power Supply 120 V AC, 60 Hz
Magnetron Cooling Forced Air Cooling
Microwave Stirring Turntable
Rectification Rectification Voltage Doubler Half-Wave
Door Sealing Choke Cover and Choke System
Safety Devices Thermostat:
Open at 90
°c ±5 °c
Close at 75 °c ±5 °c
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor Switch
Magnetron 2M246
High Voltage Capacitor
High Voltage Diode 350 mA, 9.0 KV
Cavity Lamp 125 V, 20 W
Tray Tempered Safety Glass
Overall Dimensions
(W x D x H) 207/8”x 151/2”x 123/8”217/8”x 171/4”x 125/8”237/8”x 1913/16”x 139/16”
Oven Cavity Size
(W x D x H) 133/4”x 143/8”x 93/8”1413/16”x 1515/16”x 97/8”1717/32”x 1821/32”x 107/8”
Effective Capacity of Oven Cavity 1.1 Cu.ft 1.4 Cu.ft 2.1 Cu.ft
Accessories Owner’s Manual, Easy Use Chart
Glass Turntable, Rotating Ring
1.0 µF, 2.1 KV AC 0.95 µF, 2.1 KV AC 1.0 µF, 2.1 KV AC

• DO NOT operate on a 2-wire extension cord during
repair and use.
• NEVER TOUCH any oven components or wiring during
operation.
• BEFORE TOUCHING any parts of the oven, always
remove the power plug from the outlet.
• For about 30 seconds after the oven stops, an electric
charge remains in the high voltage capacitor. When
replacing or checking, you must discharge the high
voltage capacitor by shorting across the two terminals
with an insulated screwdriver.
• 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.
• 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.
2-1
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.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
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
secured not to be operated the device without
a microwave energy absorbing load attached.
Never look into an open waveguide or antenna
while the device is energized.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON