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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 opened.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or
other microwave source, and make repairs if 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, and (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.
TABLE OF CONTENTS
PROPER USE AND SERVICE PRECAUTIONS.........................................................................................................2
SPECIFICATIONS........................................................................................................................................................3
FEATURES DIAGRAM ................................................................................................................................................4
EARTHING INSTRUCTIONS.......................................................................................................................................5
INSTALLATION ............................................................................................................................................................5
OPERATION PROCEDURE ........................................................................................................................................6
CONTROLS..................................................................................................................................................................7
INTERLOCK MECHINISM FUNCTIONS AND ADJUSTMENTS..............................................................................17
MEASUREMENT OF THE MICROWAVE OUTPUT POWER..................................................................................19
WIRING DIAGRAM ....................................................................................................................................................21
CIRCUIT DESCRIPTION ...........................................................................................................................................23
SAFTY PRECAUTIONS FOR DISASSEMBLY AND REPAIR .................................................................................26
DISASSEMBLY AND ASSEMBLY.............................................................................................................................27
TROUBLE SHOOTING GUIDE .................................................................................................................................33
KEYBOARD CHECK PROCEDURE .........................................................................................................................38
COMPONENT TEST PROCEDURE .........................................................................................................................39
SAFETY INTERLOCK CONTINUITY TEST..............................................................................................................40
PRINTED WIRING BOARD .......................................................................................................................................41
CIRCUIT CHECK PROCEDURE...............................................................................................................................41
P.C.B. CIRCUIT DIAGRAM........................................................................................................................................45
COMPONENT INFORMATION .................................................................................................................................46
PRINTED CIRCUITS BOARD....................................................................................................................................47
P.C.B. LOCATION NO ...............................................................................................................................................49
EXPLODED AND PARTS LIST .................................................................................................................................51
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