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S/M No. : R639R0S001
Service Manual
Microwave Oven
Model: KOR-639R0S
Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr Jan. 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 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 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
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 ........................................................................................................................................4
3. CONTROL PANEL ............................................................................................................................................5
INSTALLATION ...................................................................................................................................................................6
OPERATIONS AND FUNCTIONS .......................................................................................................................................7
DISASSEMBLY AND ASSEMBLY......................................................................................................................................8
INTERLOCK MECHANISM AND ADJUSTMENT .............................................................................................................15
TROUBLE SHOOTING GUIDE .........................................................................................................................................16
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
PRINTED CIRCUIT BOARD ..............................................................................................................................................24
1. CIRCUIT CHECK PROCEDURE ....................................................................................................................24
2. P.C.B CIRCUIT DIAGRAM..............................................................................................................................28
3. P.C.B LOCATION NO .....................................................................................................................................29
EXPLODED VIEW AND PARTS LIST...............................................................................................................................30
1. DOOR ASSEMBLY .........................................................................................................................................30
2. CONTROL PANEL ASSEMBLY ......................................................................................................................30
3. TOTAL ASSEMBLY.........................................................................................................................................30
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 servic-
ing 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 con-
tact the manufacturer.
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 mark-
ings 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', earth 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 KOR-639R
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH GROUNDING
MICROWAVE 1200W
POWER
GRILL
CONSUMPTION
COMBINATION
MICROWAVE ENERGY OUTPUT 800W
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 465 x 279 x 375 mm (18.3 x 11.0 x 14.8 in)
CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in)
NET WEIGHT APPROX. 13 kg (28.7 Ibs.)
TIMER 59 min. 00 sec.
FUNCTION SELECTIONS MICROWAVE
POWER SELECTIONS 5 LEVELS
CAVITY VOLUME 0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
465 375
2. FEATURE DIAGRAM 279
3 5 4 1
KOR-639R0S
Defrost
Power
Clock
Auto cook 1. Dinner Plate
2. Soup
3. Bevar age
4. Fresh Vegetable
M/W DEF. LOCK g
ht-Tim
eig
W
e
Stop/Clear
Start/Easy cook
2 6 7
1 SEFETY INTERLOCK SYSTEM
2 DOOR SCREEN - Allows viewing of food. The screen is designed so that light can pass through, but not
the microwave.
3 DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the oven
is operating, the magnetron tube will immediately stop operating.
4 OVEN CAVITY
5 DOOR SEAL - Door seal surfaces prevent microwave from escaping from the oven cavity.
6 GLASS COOKING TRAY - Made of special heat resistant glass. The tray can be easily removed for clean-
ing. Make sure it is correctly positioned(indentation) before operating. Place food in a suitable
container(dish) on the tray.
7 ROLLER GUIDE - Supports the glass cooking tray.
4
3. CONTROL PANEL
KOR-639R0S
Defrost
2
Power
3
Clock
4
Auto cook 1. Dinner Plate
1 2. Soup
3. Beverage
4. Fresh Vegetable
5
M/W DEF. LOCK g
eight-Tim
W
e
8
Stop/Clear
6
Start/Easy cook
7
1 Auto cook - Used to cook using a program or to reheat.
2 Defrost - Used to defrost foods by weight or time.
3 Power - Used to set power level.
4 Clock - Used to set clock.
5 Display - Cooking time, power level, indicators are displayed.
6 Stop / Clear - Used to stop the oven operation or to erase all entries.
7 Start / Easy cook - Used to start the oven operation and also increase the reheat time by 30 seconds.
8 Dial Knob - Used to set the time and weight.
5
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 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