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Service Manual
Microwave Oven
Model: KOG-311M0P
KOG-311Q0P
DAEWOO ELECTRONICS CO., LTD.
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 connection.
(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
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................................................................................................................................1
PROPER USE AND SERVICE PRECAUTIONS ................................................................................................................................................2
SPECIFICATIONS.....................................................................................................................................................................................................3
FEATURES DIAGRAM.............................................................................................................................................................................................4
EARTHING INSTRUCTIONS..................................................................................................................................................................................6
INSTALLATION..........................................................................................................................................................................................................6
OPERATION PROCEDURE...................................................................................................................................................................................7
CONTROLS................................................................................................................................................................................................................8
INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS.................................................................................................................16
MEASUREMENT OF THE MICROWAVE OUTPUT POWER.......................................................................................................................18
MICROWAVE EMISSION TEST..........................................................................................................................................................................18
WIRING DIAGRAM.................................................................................................................................................................................................19
CIRCUIT DESCRIPTION.......................................................................................................................................................................................20
SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR....................................................................................................................23
DISASSEMBLY AND ASSEMBLY ......................................................................................................................................................................24
TROUBLE SHOOTING GUIDE............................................................................................................................................................................30
COMPONENT TEST PROCEDURE...................................................................................................................................................................39
PRINTED CIRCUIT BOARD .................................................................................................................................................................................41
CIRCUIT CHECK PROCEDURE ..................................................................................................................................................................41
P.C.B. CIRCUIT DIAGRAM.............................................................................................................................................................................46
COMPONENT INFORMATION.....................................................................................................................................................................48
PRINTED CIRCUIT BOARD...........................................................................................................................................................................49
P.C.B. LOCATION NO.....................................................................................................................................................................................50
EXPLODED AND PARTS LIST............................................................................................................................................................................51
1
CAUTION: This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service
Manual for Proper Service Procedures to Assure Continued Compliance with the Federal
Performance Standard for Microwave Ovens and for Precautions to be Taken to Avoid Possible
Exposure to Excessive Microwave Energy.
PROPER USE AND SERVICE PRECAUTIONS
1. FOR SAFE OPERATION
Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking
and may cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST. OPERATOR MUST NOT USE THE APPLIANCE.
(Only a trained service personnel should make repairs.)
1) A broken door hinge.
2) A broken door viewing screen.
3) A broken front panel, oven cavity.
4) A loosened door lock.
5) A broken door lock.
The door gasket plate and oven cavity surface should be kept clean.
No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven.
DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN.
The microwave oven has concealed switches to make sure the power is turned off when the door is opened.
Do not attempt to defeat them.
DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.
2. FOR SAFETY SERVICE PROCEDURES.
1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to
servicing the oven.
2) If any certified oven unit is found to have excessive emission level 5mW/cm2, the service person should:
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the
oven and contact the manufacturer and CDRH immediately.
2
SPECIFICATIONS
POWER SUPPLY 220V~60Hz SINGLE PHASE WITH EARTHING
MICROWAVE 1500W
POWER CONSUMPTION GRILL 1100W
COMBI 2600W
MICROWAVE ENERGY OUTPUT 950W (IEC 705)
MICROWAVE FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS (WxHxD) 564 x 310 x 413 mm
CAVITY DIMENSIONS (WxHxD) 374 x 233 x 372 mm
NET WEIGHT APPROX. 18Kg (38.4 lbs.)
TIMER 59 min. 99 sec.
FUNCTION SELECTIONS MICROWAVE / GRILL / COMBINATION
MICROWAVE POWER LEVELS 10 LEVELS
* Specifications are subject to change without notice.
3
FEATURES DIAGRAM
1. Door latch