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S/M NO. : C621Q0S001
Service Manual
Microwave Oven
Model: KOC-621Q0S
DAEWOO ELECTRONICS CO., LTD.
http://svc.dwe.co.kr Dec. 2001
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.
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
1. SAFETY AND PRECAUTIONS....................................................................................................................................2
2. SPECIFICATIONS ........................................................................................................................................................3
3. EXTERNAL VIEW.........................................................................................................................................................3
3-1. OUTER DIMENSION ..........................................................................................................................................3
3-2. FEATURE DIAGRAM .........................................................................................................................................4
4. INSTALLATION ............................................................................................................................................................5
5. CONTROL PANEL .......................................................................................................................................................6
6. DISASSEMBLY AND ASSEMBLY ..............................................................................................................................7
7. INTERLOCK MECHANISM AND ADJUSTMENT.....................................................................................................15
8. TROUBLE SHOOTING GUIDE ..................................................................................................................................16
9. MEASUREMENT AND TEST.....................................................................................................................................22
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................22
9-2. MICROWAVE RADIATION TEST ....................................................................................................................23
9-3. COMPONENT TEST PROCEDURE................................................................................................................24
9-4. COMPONENT ACTION....................................................................................................................................25
10. WIRING DIAGRAM...................................................................................................................................................26
11. EXPLODED VIEW AND PARTS LIST ..................................................................................................................27
11-1. DOOR ASSEMBLY.........................................................................................................................................27
12-2. CONTROL PANEL ASSEMBLY.....................................................................................................................27
13-3. TOTAL ASSEMBLY ........................................................................................................................................27
12. PRINTED CIRCUIT BOARD ....................................................................................................................................29
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................33
1
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.
(1) inform the manufacturer, importer or assembler,
(2) repair the unit at no cost to the owner,
(3) attempt to ascertain the cause of the excessive leakage,
(4) 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', 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
2. SPECIFICATIONS
MODEL KOC-621Q0S
POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING
MICROWAVE 1250W
POWER GRILL 1250W
CONSUMPTION OVEN 1650W
COMBINATION 2500W
MICROWAVE ENERGY OUTPUT 800W(IEC705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 470X285X376mm (18.5X11.2X14.8 in.)
CAVITY DIMENSIONS (W X H X D) 295X167X300mm (11.6X6.6X11.8 in.)
NET WEIGHT APPROX. 15kg (33.1 lbs.)
TIMER Oven: 99 minutes, M/W: 60 minutes, Grill: 30 minutes
FUNCTION SELECTIONS MICROWAVE/ GRILL/ OVEN/ COMBINATION
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 0.6 Cu. Ft
* Specifications are subject to change without notice.
3. EXTERNAL VIEW
3-1. OUTER DIMENSION
470 376
285
3
3-2. FEATURE DIAGRAM
1 2 3 4 5
M/W Def. Grill Temp g
Auto Cook
1. Roast Beef 2. Roast Pork
3. Roast Chicken 4. Fish Fillets
5. Vegetable
M/W Defrost
Grill 1000g 10m.
Combi 100g 1m.
6
Temp 10s.
Clock Auto Cook
Stop/ Start/
Clear Speedy cook
Combi
KOC-621Q
e w q 7
8
9
0
11.DOOR HOOK
When the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron
will immediately stop operating.
12.DOOR VIEWING SCREEN
Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
13.TOP HEATER
Turns on when convection, grill and combi cooking is selected.
14.OVEN LAMP
Automatically turns on during oven operating.
15.SAFETY INTERLOCK SYSTEM
16.CONTROL PANEL
17. UNDER HEATER
18. METAL RACK
19.TURNTABLE TRAY
Rotates during cooking and ensure even distribution of Microwaves.
It can also be used as a cooking utensil.
10.TRAY GUIDE
This must always be used for cooking together with the turntable tray.
11. COUPLER
This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.
12. OVEN FRONT PLATE
13.DOOR SEAL
Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
4
4. 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