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S/M No. : G37B50S001

Service Manual
Microwave Oven
Model: KOG-37B50S
KOG-39B50S

DAEWOO ELECTRONICS CO., LTD.
http://svc.dwe.co.kr
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 w ith the door open.
(b) M ake the following safety checks on all ovens to be serviced before activating the m agnetron or other m icrowave
source, and m ake repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) S eal and sealing
surfaces (arcing, wear, and other dam age), (4) Dam age to or loosening of hinges and latches, (5) Evidence of
dropping or abuse.
(c) Before turning on power to the m icrow ave oven for any service test or inspection within the m icrowave
generating com partm ents, check the m agnetron, wave guide or transm ission line, and cavity for proper
alignm ent, integrity, and connections.
(d) Any defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrowave generation and
transm ission system s shall be repaired, replaced, or adjusted by procedures described in this m anual before the
oven is released to the ow ner.
(e) A m icrowave leakage check to verify com pliance with the Federal perform ance standard should be perform ed on
each oven prior to release to the owner.

SAFETY AND PRECAUTIONS ........................................................................................................ 2
SPECIFICATIONS ............................................................................................................................ 3
EXTERNAL VIEW ............................................................................................................................ 4
1. OUTER DIMENSION .................................................................................................................... 4
2. FEATURE DIAGRAM ................................................................................................................... 5
INSTALLATION ................................................................................................................................ 6
OPERATIONS AND FUNCTIONS ................................................................................................... 7
DISASSEMBLY AND ASSEMBLY .................................................................................................. 8
INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................... 17
TROUBLE SHOOTING GUIDE ........................................................................................................ 18
MEASUREMENT AND TEST ........................................................................................................... 20
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 20
2. MICROWAVE RADIATION TEST ................................................................................................ 21
3. COMPONENT TEST PROCEDURE ............................................................................................ 22
WIRING DIAGRAM .......................................................................................................................... 23
EXPLODED VIEW AND PARTS LIST ............................................................................................. 24
1. DOOR ASSEMBLY ...................................................................................................................... 24
2. CONTROL PANEL ASSEMBLY ................................................................................................... 24
3. TOTAL ASSEMBLY ...................................................................................................................... 24

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 w ire in this m ains lead coloured in accordance with the follow ing code.

G reen-and-yellow : E arth
B lue : N eutral
B row n : Live

A s the colours of the w ires in the m ains lead of this appliance m ay not correspond w ith the coloured m arkings
identifying the term inals in your plug, proceed as follow s.
The w ire which is coloured green-and-yellow m ust be connected to the term inal in the plug w hich is m arked w ith the
letter 'E ', earth sym bol 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.

SPECIFICATIONS

M ODEL K O G -37B 50S K O G -39B 50S

P O W E R S U P P LY 230V -50H z, SIN G LE P H A SE W ITH E A RT HIN G

P O W E R C O N SU M PT IO N M IC RO W AVE 1200W 1350W

G R ILL 1050W 1050W

C O M B IN AT IO N 2200W 2350W

M IC R O W AV E EN E R G Y O U TP U T 800W 900W

M IC R O W AV E FR E Q U EN C Y 2450M H z 2450M H z

O UT S ID E D IM EN S IO NS (W X H X D) 465 x 279 x 354 m m 495 x 294 x 384m m

C AV IT Y D IM E N S IO N S (W X H X D ) 290 x 220 x 306 m m 320 x 244 x 338 m m

N ET W E IG H T A P P RO X . 13.4 K g A P P RO X . 15.5 K g

T IM E R 35 m in. D U AL S P E ED

F UN C T IO N S E LE C T IO N S M IC RO W AV E/G R ILL/C O M B IN AT IO N

P O W E R S E LE CT IO N S 5 LE VE LS

C AV IT Y V O LU M E 0.7 C u.F t. 0.9 Cu.F t.

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

EXTERNAL VIEW

1. OUTER DIMENSION

Fig1. Front view Fig2. Side view

EXTERNAL VIEW

2. FEATURE DIAGRAM

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) Safety interlock system
6) Knob V.P.C - Used to select a microwave power level.
7) Knob timer - Used in setting cooking time for all functions.
8) Door release button - By pushing this button the latch system cut off all circuits and stops the oven before the door is opened.
9) Metal Rack
10) Coupler - This fits over the shaft in the center of the ovens cavity floor.
This is to remain in the oven for all cooking.
11) Roller guide - This must always be used for cooking together with the glass cooking tray.
12) Glass cooking tray - Made of special heat resistant glass.
Food in a proper receptacle is placed on this tray for cooking.
13) Door viewing screen - Allows viewing of food.
The screen is designed so that light can pass through, but not the microwave.
14) 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 automatically shut off.

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