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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 micro-
wave 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 power to the microwave oven for any service test or inspection within the microwave gen-
erating compartments, check the magnetron, wave guide or transmission line, and cavity for proper align-
ment, 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 per-
formed on each oven prior to release to the owner.
TABLE OF CONTENTS
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ......................................................................................................1
CAUTIONS .....................................................................................................................................................................2
SAFETY AND PRECAUTIONS ...........................................................................................................................................2
1. FOR SAFE OPERATION ..................................................................................................................................2
INSTALLATIONS ...........................................................................................................................................................3
2. FOR SAFE SERVICE PROCEDURES .............................................................................................................2
SERVICE INFORMATION ..............................................................................................................................................4
SPECIFICATIONS ...............................................................................................................................................................3
CIRCUIT DESCRIPTION .........................................................................................................................................4
EXTERNAL VIEW................................................................................................................................................................4
PARTS LIST .........................................................................................................................................................5-6
1. OUTER DIMENSION.........................................................................................................................................4
PARTS DIAGRAM ................................................................................................................................................7-8
2. FEATURES DIAGRAM......................................................................................................................................4
TOOLS AND MEASURING INSTRUMENTS ..........................................................................................................9
3. CONTROL PANEL ............................................................................................................................................5
MICROWAVE LEAKAGE TEST ..............................................................................................................................9
INSTALLATION ...................................................................................................................................................................7
MEASUREMENT OF MICROWAVE POWER OUTPUT .......................................................................................10
OPERATIONS AND FUNCTIONS.......................................................................................................................................8
DISASSEMBLY AND ASSEMBLY......................................................................................................................................9
DISASSEMBLY AND ADJUSTMENT ................................................................................................................... 11
INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................16
1. Removing The Door..........................................................................................................................................12
TROUBLESHOOTING GUIDE ..........................................................................................................................................17
2. Removing The Antenna Stirrer System ............................................................................................................12
MEASUREMENT AND TEST ............................................................................................................................................21
3. Removing The Cooling Fan ..............................................................................................................................13
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................21
4. High Voltage Transformer Removal ..................................................................................................................13
2. MICROWAVE RADIATION TEST ...................................................................................................................22
5. High Voltage Capacitor And Diode Removal ....................................................................................................13
3. TEST PROCEDURE ........................................................................................................................................23
6. Magnetron Removal .........................................................................................................................................14
WIRING DIAGRAM............................................................................................................................................................24
7. Removing The Turn Motor ................................................................................................................................14
PRINTED CIRCUIT BOARD..............................................................................................................................................25
1. CIRCUIT CHECK PROCEDURE ....................................................................................................................25
8. Pcb Assembly Removal ....................................................................................................................................14
2. PCB CIRCUIT DIAGRAM................................................................................................................................30
9. Interlock System ...............................................................................................................................................14
EXPLODED VIEW AND PARTS LIST...............................................................................................................................31
INTERLOCK CONTINUITY TEST .........................................................................................................................15
1. DOOR ASSEMBLY .........................................................................................................................................31
1. Primary Interlock Switch Test ............................................................................................................................15
2. CONTROL PANEL ASSEMBLY......................................................................................................................31
2. Secondary Interlock Switch Test .......................................................................................................................15
3. GUIDE WIND ASSEMBLY ..............................................................................................................................31
3. Monitor Switch Test ...........................................................................................................................................15
4. TOTAL ASSEMBLY.........................................................................................................................................31
COMPONENT TEST PROCEDURE .....................................................................................................................16
TROUBLE SHOOTING .........................................................................................................................................20
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Table of Contents
Troubleshooting
