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S/M No. : R1B4H0A002

Service Manual
Microwave Oven
Model: KOR-1B4H0A MCD1311ST
EW13F1ST
KOR-1B4H9A04

DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr Mar. 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
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 (5) Evidence of dropping or abuse.
(c) Before turning on power to the microwave oven 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
SAFETY AND PRECAUTIONS........................................................................................................................................3
FOR SAFE OPERATION ...........................................................................................................................................3
FOR SAFE SERVICE PROCEDURES .....................................................................................................................3
SPECIFICATIONS ............................................................................................................................................................4
EXTERNAL VIEW .............................................................................................................................................................5
OUTER DIMENSION .................................................................................................................................................5
FEATURE DIAGRAM.................................................................................................................................................6
CONTROL PANEL .....................................................................................................................................................7
INSTALLATION ................................................................................................................................................................8
OPERATIONS AND FUNCTIONS ...................................................................................................................................9
DISASSEMBLY AND ASSMBLY...................................................................................................................................10
INTERLOCK MECHANISM AND ADJUSTMENT.........................................................................................................17
TROUBLE SHOOTING GUIDE ......................................................................................................................................18
MESUREMENT AND TEST............................................................................................................................................22
MEASUREMENT OF THE MICROWAVE POWER OUTPUT................................................................................22
MICROWAVE RADIATION TEST ...........................................................................................................................23
COMPONENT TEST PROCEDURE .......................................................................................................................24
WIRING DIAGRAM.........................................................................................................................................................25
PRINTED CIRCUIT BOARD...........................................................................................................................................27
CIRCUIT CHECK PROCEDURE.............................................................................................................................27
PCB CIRCUIT DIAGRAM ........................................................................................................................................30
P.C.B. LOCATION NO. ............................................................................................................................................31
EXPLODED VIEW AND PARTS LIST ...........................................................................................................................32
DOOR ASSEMBLY ..................................................................................................................................................32
CONTROL PANEL ASSEMBLY ..............................................................................................................................32
TOTAL ASSEMBLY .................................................................................................................................................32

2
SAFETY AND 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 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 servicing, a microwave emission check should be performed prior to
servicing the oven.
(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. WAVEGUIDES
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.

3
SPECIFICATIONS
MODEL KOR-1B4H0A KOR-1B4H9A04
POWER SUPPLY 120V~60HZ, SINGLE PHASE WITH EARTHING
MICROWAVE 1500 W 1400 W
POWER
GRILL
CONSUMPTION
COMBINATION
MICROWAVE ENERGY OUTPUT 1100 W 1000W
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 560X344X471mm (22.0X13.5X18.5 in.)
CAVITY DIMENSIONS (W X H X D) 369X246X394mm (14.5X9.7X15.5 in.)
NET WEIGHT APPROX. 16.7kg
TIMER 99min. 99sec.
FUNCTION SELECTIONS MICROWAVE
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.3 Cu. Ft
* Specifications are subject to change without notice.

4
EXTERNAL VIEW
1. OUTER DIMENSION

560 471

344

5
2. FEATURE DIAGRAM

2 1 4 6

7

3 9 5

8

0

1. DOOR SEAL
Door seal maintains the microwave within the oven cavity and prevents microwave leakage.
2. DOOR HOOK
When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will
immediately stop operating.
3. DOOR SCREEN
Allows viewing of food. Microwave cannot pass through perforations in screen.
4. SPATTER SHIELD
Protects the microwave outlet from splashes of cooking foods.
5. OVEN LAMP
Automatically turns on during oven operating.
6. SAFETY INTERLOCK SYSTEM
7. CONTROL PANEL
8. GLASS COOKING TRAY
Made of special heat resisant glass. The tray must always be in proper position before operating. Do not cook food
directly on the tray.
9. OVEN FRONT PLATE
10. ROLLER GUIDE
Supports the glass cooking tray.

6
3. CONTROL PANEL

2
M/W DEF TIMER LOCK lb

3
FROZEN DINNER
POPCORN
PIZZA PLATE

4 MORE LESS 5
FRESH FROZEN
BEVERAGE
VEGETABLE VEGETABLE

6 MEAT POULTRY FISH

7 POWER DEFROST 8
1 2 3
4 5 6 1
7 8 9
9 KITCHEN
TIMER 0 CLOCK 0

q STOP/CLEAR START/
SPEEDY COOK w

1. Time set pad - Used to set the cooking time and the present time.
2. Display - Cooking time, power level, indicators and present time are displayed.
3. One touch - Used to cook or reheat specific quantities of food.
4. More - Used to add time to cooking.
5. Less - Used to remove time from cooking.
6. Auto Defrost - Used to defrost foods.(for weight)
7. Power - Used to set power level.
8. Defrost - Used to defrost foods.(for time)
9. Kitchen Timer - Used as a minute timer, delay cooking, hold setting after cooking.
10. Clock - Used to set clock.
11. Stop/Clear - Used to stop the oven operation or to delete the cooking data.
12. Start/Easy cook - Used to start the oven and also used to set a reheat time.

7
INSTALLATION
1. Steady, flat location.
This microwave oven should be set on a steady, flat surface.
2. Leave space behind and side.
All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated
and, eventually, cause oven failure.
3. Away from radio, and TV sets
Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna, or
feeder and so on. Position the oven as far from them as possible.
4. Away from heating appliances and water taps
Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be
adversely affected and breakdowns occur.
5. Power supply