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DAEWOO ELECTRONICS CO., LTD.
686, AHYEON-DONG MAPO-GU
SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: "DAEWOOELEC"
E-MAIL : [email protected]
FAX: 02) 360-8184
TEL: 02) 360-8179~8180

PRINTED DATE: Dec. 1999
Service Manual
Microwave Oven
Model :KOG-371G0S KOG-391G0S
KOG-371H0S KOG-391H0S
KOG-376T1S KOG-396T1S
KOG-371R0S KOG-391R0S
KOG-374R0S KOG-375R0S
KOG-373R0S KOG-393R0S

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 power to the microwave oven for any service test or inspection within the
microwave generating compartments, check the magnetron, wave huide 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..................................................................................................................................2
1. FOR SAFE OPERATION .....................................................................................................................2
2. FOR SAFE SERVICE PROCEDURES ................................................................................................2
SPECIFICATIONS......................................................................................................................................................3
EXTERNAL VIEW ......................................................................................................................................................4
1. OUTER DIMENSION............................................................................................................................4
2. FEATURE DIAGRAM ...........................................................................................................................6
3. CONTROL PANEL .............................................................................................................................12
INSTALLATION .......................................................................................................................................................19
OPERATIONS AND FUNCTIONS ...........................................................................................................................20
DISASSEMBLY AND ASSEMBLY ..........................................................................................................................21
INTERLOCK MECHANISM AND ADJUSTMENT ...................................................................................................43
TROUBLE SHOOTING GUIDE................................................................................................................................45
MEASUREMENT AND TEST...................................................................................................................................49
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...........................................................49
2. MICROWAVE RADIATION TEST ......................................................................................................50
3. COMPONENT TEST PROCEDURE ..................................................................................................51
WIRING DIAGRAM ..................................................................................................................................................52
PRINTED CIRCUIT BOARD ............................................................................................................54, 60, 66, 72, 77
1. CIRCUIT CHECK PROCEDURE ...............................................................................55, 61, 67, 73, 78
2. PCB CIRCUIT DIAGRAM...........................................................................................57, 63, 69, 75, 80
3. P.C.B. LOCATION NO. ..............................................................................................58, 64, 70, 76, 81
EXPLODED VIEW AND PARTS LIST .....................................................................................................................83
1. DOOR ASSEMBLY ............................................................................................................................83
2. CONTROL PANEL ASSEMBLY.........................................................................................................83
3. TOTAL ASSEMBLY............................................................................................................................83

1
SAFETY AND 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 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 immediately.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code.
Green-and-yellow : Earth
Blue : Neutral
Brown : Live
As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows:
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked
with the letter `E', symbol or coloured green-and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter `N' or
coloured black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter `L' or
coloured red.

NOTE : This oven is designed for counter-top use only.

2
SPECIFICATIONS
MODEL KOG-371G/H/R0S, KOG-374R/5R0S KOG-391G/H/R0S
POWER SUPPLY 230~, 50Hz SINGLE PHASE WITH EARTHING
MICROWAVE 1200W 1350W
POWER CONSUMPTION GRILL 1050W 1050W
COMBINATION 2200W 2350W
MICROWAVE ENERGY OUTPUT 800W 900W
MICROWAVE FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS(WXHXD) 465X279X360mm 495X294X388mm
(18.3X11.0X14.2 in) (19.5X11.6X15.3 in)
CAVITY DIMENSIONS(WXHXD) 290X220X306mm 320X244X338mm
(11.4X8.7X12.0 in) (12.6X9.6X13.3 in)
NET WEIGHT APPROX. 14Kg(30.9 lbs) APPROX. 16Kg(35.3 lbs)
TIMER 59 min. 90 sec.
FUNCTION SELECTIONS MICROWAVE / GRILL / COMBINATION
POWER SELECTIONS* 10 LEVELS / 5 LEVELS
CAVITY VOLUME 0.7 Cu. Ft. 0.9 Cu. Ft.
- POWER SELECTIONS* : KOG-371R/391R0S : 5 LEVELS.

MODEL KOG-376T1S KOG-396T1S
POWER SUPPLY 230~, 50Hz SINGLE PHASE WITH EARTHING
MICROWAVE 1200W 1350W
POWER CONSUMPTION GRILL 1050W 1050W
COMBINATION 2200W 1350W
MICROWAVE ENERGY OUTPUT 800W 950W
MICROWAVE FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS(WXHXD) 465X279X370mm 495X294X403mm
(18.3X11.0X14.6 in) (19.5X11.6X15.9 in)
CAVITY DIMENSIONS(WXHXD) 290X220X306mm 320X244X338mm
(11.4X8.7X12.0 in) (12.6X9.6X13.3 in)
NET WEIGHT APPROX. 14Kg(30.9 lbs) APPROX. 16Kg(35.3 lbs)
TIMER 60 min. 00 sec.
FUNCTION SELECTIONS MICROWAVE / GRILL / COMBINATION
POWER SELECTIONS 4 LEVELS
CAVITY VOLUME 0.7 Cu. Ft. 0.9 Cu. Ft.

MODEL KOG-373R0S KOG-393R0S
POWER SUPPLY 230~, 50Hz SINGLE PHASE WITH EARTHING
MICROWAVE 1200W 1350W
POWER CONSUMPTION GRILL 1050W 1050W
COMBINATION 2200W 2350W
MICROWAVE ENERGY OUTPUT 800W 950W
MICROWAVE FREQUENCY 2450 MHz
OUTSIDE DIMENSIONS(WXHXD) 465X279X365mm 495X294X392mm
(18.3X11.0X14.4 in) (19.5X11.6X15.4 in)
CAVITY DIMENSIONS(WXHXD) 290X220X306mm 320X244X338mm
(11.4X8.7X12.0 in) (12.6X9.6X13.3 in)
NET WEIGHT APPROX. 14Kg(30.9 lbs) APPROX. 16Kg(35.3 lbs)
TIMER 59 min. 90 sec.
FUNCTION SELECTIONS MICROWAVE / GRILL / COMBINATION
POWER SELECTIONS 5 LEVELS
CAVITY VOLUME 0.7 Cu. Ft. 0.9 Cu. Ft.

3
EXTERNAL VIEW

1. OUTER DIMENSION
1) KOG-371G/H0S, KOG-391G/H0S

465/495 360/388

279/294

2) KOG-376T1S, KOG-396T1S

3) KOG-373R0S, KOG-393R0S

465/495 365/392
279/294

4
4) KOG-371R0S, KOG-391R0S

465/495 360/388

279/294

5) KOG-374R0S

465 360
279

6) KOG-375R0S

465 360
279

5
2. FEATURE DIAGRAM
1) KOG-371G/H0S, KOG-391G/H0S

1 2 3 4 5

12 11 10 9 8

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. DOOR RELEASE BUTTON - By pushing this button the latch system cut off all circuits and stops the
oven before the door is opened.
7. METAL RACK
8. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
9. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
10. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is
placed on this tray for cooking.
11. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
12. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the

6
2) KOG-376T1S, KOG-396T1S

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. CONTROL PANEL
7. METAL RACK
8. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
9. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
10. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is
placed on this tray for cooking.
11. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
12. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop operating.

7
3) KOG-371R0S, KOG-391R0S

1 2 3 4 5

12 11 10 9 8

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. CONTROL PANEL
7. DOOR OPENING BUTTON
8. METAL RACK
9. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
10. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
11. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is
placed on this tray for cooking.
12. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
13. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop operating.

8
4) KOG-374R0S

q 1 2 3 5

6
0 4 8 7 9

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. METAL RACK
7. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
8. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
9. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is placed
on this tray for cooking.
10. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
11. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop operating.

9
5) KOG-375R0S

q 1 2 3 5

6
0 4 8 7 9

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. METAL RACK
7. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
8. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
9. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is placed
on this tray for cooking.
10. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
11. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop operating.

10
6) KOG-373R0S, KOG-393R0S

1 2 3 4 5

q 0 9 8 7

1. DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
2. REFLECTOR(Insulator Heater)
3. HEATING ELEMENT
4. OVEN CAVITY
5. SEFETY INTERLOCK SYSTEM
6. METAL RACK
7. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven
for all cooking.
8. ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.
9. GLASS COOKING TRAY - Made of special heat resistant glass. Food in a proper receptacle is placed
on this tray for cooking.
10. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass
through, but not the microwave.
11. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop operating.

11
3. CONTROL PANEL
1) KOG-371G0S, KOG-391G0S

2
M/W Def. Grill Combi Timer/g

1. BREAD
2. SOUP
3. BAKED POTATO
4. FRESH VEGETABLE
Auto
Cook 4
5. FROZEN VEGETABLE

3
Pasta
Frozen Pizza
Beverage

5 6
Auto Defrost

7
Fish Poultry Meat
8 9
COMBI GRILL Defrost
0 q
Power Kitchen Clock
Timer
w e
ur in in
1ho 10m 1m
10M 1M 10S 1

r STOP/
CLEAR
START/
SPEEDY COOK
t

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. AUTO COOK - Used to cook or reheat.
5. MORE - Used to add time to cooking.
6. LESS - Used to remove time from cooking.
7. AUTO DEFROST - Used to defrost foods.(for weight)
8. COMBI - Used to cook COMBI.
9. GRILL - Used to cook GRILL.
10. POWER - Used to set power level.
11. DEFROST
12. KITCHEN TIMER - Used as a minute timer, to delay the start of cooking, or to set a holding time after
cooking.
13. CLOCK - Used to set clock.
14. STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
15. START/SPEEDY COOK - Used to start the oven and also used to set a reheat time.

12
2) KOG-371H0S, KOG-391H0S

2
M/W Def. Grill Combi Timer/g

Frozen Pizza
4
3
Fresh Vegetable Beverage
5

Dish Warmer Pasta
Auto Defrost

6
Fish Poultry Meat
7 8
COMBI GRILL Defrost
9 0
Power Kitchen Clock
Timer
q w
ur in in
1ho 10m 1m
10M 1M 10S 1

e STOP/
CLEAR
START/
SPEEDY COOK
r

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. COMBI - Used to cook COMBI.
8. GRILL - Used to cook GRILL.
9. POWER - Used to set power level.
10. DEFROST
11. KITCHEN TIMER - Used as a minute timer, to delay the start of cooking, or to set a holding time after
cooking.
12. CLOCK - Used to set clock.
13. STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
14. START/SPEEDY COOK - Used to start the oven and also used to set a reheat time.

13
3) KOG-376T1S, KOG-396T1S

1. Display - Cooking time, power level, indicators and present time are displayed.
2. Clock - Used to set clock.
3. Start/Easy Cook - Used to start operation, also for easy start (each press adds 30 seconds microwave
cooking time).
4. Stop/Clear - Used to stop the operation or to delete the cooking data.
5. Auto Cook - Used to cook using a program.
6. Knob - Turm to set the cooking menu and select a microwave power level.
7. Knob - Dial for setting time and weight.(You can also extend the time of the current operation by 1
minute by turning the dial knob, except defrosting)

14
4) KOG-371R0S, KOG-391R0S

1
M/W DEF. Grill Combi g

Grill/Combi
Power/Def.
2
3
1. Dinner plate Auto cook

4
2. Soup
3. Beverage
4. Fresh vegetable
Start/
Easy cook

Stop/Clear
5
6 Weight/
Time

Clock

7 8

1. Display - Cooking time, power level, indicators and present time are displayed.
2. Grill/Combi - Used to cook GRILL or COMBI.
3. Power/Def - Used to set power level and DEFROST.
4. Auto cook - Used to cook using a program or to reheat.
5. Start / Easy cook - Used to start the oven operation and also increase the reheat time by 30 seconds.
6. Stop / Clear - Used to stop the oven operation or to erase all entries.
7. Clock - Used to set clock.
8. Dial Knob - Used to set the time and weight.

15
4) KOG-374R0S

Power/Def
3
Grill/Combi
2
Clock
7
Auto Cook
1. Dinner Plate
2. Soup
3. Beverage
4. Fresh Vegetable
4
ght/Time
Wei

8
6
5
Stop/Clear Start/Easy Cook

16
4) KOG-375R0S

Power/Def
3
Grill/Combi
2
Clock
7
1. Dinner Plate Auto Cook

4
2. Soup
3. Beverage
4. Fresh Vegetable

ight/Time
We

8
6
5
Stop/Clear Start/Easy Cook

17
5) KOG-373R0S, KOG-393R0S

KOG-373R

Auto cook

4
1. Dinner Plate
2. Soup
3. Beverage
4. Fresh Vegetable
Grill/Combi
2
Power/
Defrost

3
Clock

7
1
M/W DEF. Grill Combi g
6
Stop/
Clear

5
Start/
Easy cook

We
ig h-Ti m e

1. Display - Cooking time, power level, indicators and present time are displayed.
2. Grill/Combi - Used to cook grill/combi.
3. Power/Def - Used to set power level. Used to defrost foods by weight or time.
4. Auto cook - Used to cook using a program or to reheat.
5. Start / Easy cook - Used to start the oven operation and also increase the reheat time by 30 seconds.
6. Stop / Clear - Used to stop the oven operation or to erase all entries.
7. Clock - Used to set clock.
8. Dial Knob - Used to set the time and weight.

18
INSTALLATION

1. Steady, flat location
This microwave oven should be set on a steady, flat surface.
This microwave oven is designed for counter top use only.

2. Leave space behind and side
All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and,
eventually, cause 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

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