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S/M No. : T150S0A003




Service Manual
Microwave Oven
Model: KOT-150S0A
KOT-151S0A
KOT-152U0A
KOT-152C0A
KOT-155S0A




DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr Feb. 2002
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 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, (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

PROPER USE AND SERVICE PRECAUTIONS .................................................................................................................2

SPECIFICATIONS ...............................................................................................................................................................3

EXTERNAL VIEW................................................................................................................................................................4

INSTALLATION ...................................................................................................................................................................4

OPERATIONS AND FUNCTIONS.......................................................................................................................................4

DISASSEMBLY AND ASSEMBLY......................................................................................................................................5

TROUBLE SHOOTING GUIDE .........................................................................................................................................33

MEASUREMENT AND TEST ............................................................................................................................................34

WIRING DIAGRAM............................................................................................................................................................42

PRINTED CIRCUIT BOARD..............................................................................................................................................46

EXPLODED VIEW AND PARTS LIST...............................................................................................................................61




1
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 Cotinued Safey 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 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 SAFE 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.




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. Wave-Guides, Flanges and Gaskets Must be Secured. Never Operate the Device Without a
Microwave Energy Absorbing Load Attached. Never Look Into an Open waveguide or Antenna While the Device
is Energized.




2
SPECIFICATIONS
Model KOT-150S, KOT-151S, KOT-152U, KOT-152C, KOT-155S
Power Supply 120V ~ 60 Hz
Rated Current 14.0 A (microwave oven only).
Power Consumption 1600W, Max.
Microwave Output Power (IEC 705) 1000W
Frequency 2450 MHz