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Service Manual
Microwave Oven
Model : KOR-4125
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEPT.
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
micro-wave 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
com-partments, 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 3
SPECIFICATIONS 4
SCHEMATIC DIAGRAM OF FEATURES 5
INSTALLATION 6
OPERATION 7
MEASUREMENT OF THE MICROWAVE OUTPUT POWER 8
MICROWAVE RADIATION TEST 9
WIRING DIAGRAM 10
CIRCUIT DESCRIPTION 11
PRECATIONS FOR DISASSEMBLY AND REPAIR 13
DISASSEMBLY AND ASSEMBLY 14
INTERLOCK MECHANISM 19
TROUBLE SHOOTING GUIDE 21
COMPONENT TEST PROCEDURE 23
SAFETY INTERLOCK CONTINUITY TEST 24
EXPLODED AND PARTS LIST 25
2
PROPER USE AND SERVICE PRECAUTIONS
CAUTION : 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.
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 seal area and oven cavity surface 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 Safe Service Procedures.
1) If the oven to be serviced is operative, a microwave emission check should be performed prior to servicing the
oven.
2) If any ascertained 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 it until the oven has been brought into compliance.
3) If the oven operates with the door opened, the service person should tell the user not to operate the oven and
contact the manufacturer immediately.
CAUTION
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 CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS, WAVEGUIDES,
FLANGES, AND GASKETS MUST BE SECURED. NEVER OPERATE THE DEVICE WITHOUT A
MICROWAVE ENERGY ABSORBING LOAD ATTACHED IN IT. NEVER LOOK INTO AN OPEN
WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.
3
SPECIFICATIONS
ITEM SPECIFICATION
POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING
POWER CONSUMPTION 920 W
MICROWAVE OUTPOWER 600 W (IEC 705) (FULL MICROWAVE POWER)
FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 444X235X337mm
CAVITY DIMENSIONS (W X H X D) 265X172X270mm
NET WEIGHT APPROX. 12kg
TIMER 35min. DUAL SPEED
POWER SELECTIONS 5 LEVELS
CAVITY VOLUME 0.4 Cu. Ft
* Specifications subject to change without notice.
444 337
235
4
SCHEMATIC DIAGRAM OF FEATURES
2 4 8 1
9
3
10
11
5
6
7