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Service Manual
Microwave Oven
Model: KOC-970T1S
KOC-970T2S
KOC-980T10S
KOC-980T20S
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) D o not operate or allow the oven to be operated w ith the door open.
(b) M ake the follow ing safety checks on all ovens to be serviced before activating the m agnetron or other m icrow ave
source, and m ake repairs as necessary: (1) Interlock operation, (2) P roper door closing, (3) S eal and sealing
surfaces (arcing, w ear, and other dam age), (4) D am age to or loosening of hinges and latches, (5) E vidence of
dropping or abuse.
(c) B efore turning on pow er to the m icrow ave oven for any service test or inspection w ithin the m icrow ave
generating com partm ents, check the m agnetron, w ave guide or transm ission line, and cavity for proper
alignm ent, integrity, and connections.
(d) A ny defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrow ave 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 icrow ave leakage check to verify com pliance w ith the Federal perform ance standard should be perform ed on
each oven prior to release to the ow ner.
SAFETY AND PRECAUTIONS ........................................................................................................ 2
SPECIFICATIONS ................................................................................................................ ............ 3
EXTERNAL VIEW ................................................................................................................. ........... 4
1. OUTER DIMENSION .................................................................................................................... 4
2. FEATURE DIAGRAM .................................................................................................................. 5
INSTALLATION .................................................................................................................. .............. 7
CONTROL PANEL ................................................................................................................. .......... 8
DISASSEMBLY AND ASSEMBLY .................................................................................................. 9
INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................... 18
TROUBLE SHOOTING GUIDE ........................................................................................................ 19
MEASUREMENT AND TEST ........................................................................................................... 25
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 25
2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH ................................................ 26
3. MICROWAVE RADIATION TEST ................................................................................................ 27
4. COMPONENT TEST PROCEDURE ............................................................................................ 28
WIRING DIAGRAM ................................................................................................................ .......... 29
SCHEMATIC DIAGRAM .................................................................................................................. 30
EXPLODED VIEWS AND PARTS LIST ........................................................................................... 33
PRINTED WIRING BOARD .......................................................................................................... .... 39
P.C.B. CIRCUIT DIAGRAM .............................................................................................................. 44
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 w ire in this m ains lead coloured in accordance w ith the following code.
G reen-and-yellow : Earth
Blue : N eutral
Brow n : Live
As 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 w hich is coloured green-and-yellow m ust be connected to the term inal in the plug which is m arked w ith the
letter 'E' or by earth sym bol or 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 m ust be connected to the term inal which is m arked with the letter 'L' or coloured red.
NOTE
This oven is designed for counter-top use only.
SPECIFICATIONS
M O DE L KO C-970T1S KO C-970T2S
PO W E R S UP PLY 230V~50H z 230V~50H z
M IC RO W AV E 1450W 1450W
G RILL 1200W 1200W
PO W E R C O N SU M PTIO N C O N VE CTIO N 1550W 1550W
A UTO CO O K 1850W 1850W
C O M BIN ATIO N 2600W (S im ultaneous) 1550W (S equential)
M IC RO WAVE EN ER G Y O U TP UT 1000W (IE C705) 1000W (IE C705)
M IC RO WAVE FR EQ UE NC Y 2450M Hz 2450M Hz
O U TS IDE DIM E N SIO N S (W X H X D ) 526 x 345 x 412 m m (20.7 x 13.6 x 16.2 in.)
CAVITY D IM EN SIO NS (W X H X D) 335 x 250 x 339 m m (13.2 x 9.8 x 13.3 in.)
NE T W EIG HT AP PR O X . 19.5 K g (43 lbs.)
TIM ER 60 m inutes
FU N C TIO N S ELE C TIO N S M IC R O W AV E /G RILL/C O N VE C TIO N /CO M B I
PO W E R SELE CTIO NS 10 LEVELS
CAVITY V O LUM E 1.0 Cu.Ft.
M O DE L KO C980T10S KO C980T20S
PO W E R S UP PLY 230V~50H z 230V~50H z
M IC RO WAVE 1450W 1450W
G R ILL 1200W 1200W
PO W E R C O N SU M PTIO N CO NV EC TIO N 1550W 1550W
AU TO CO O K 1850W 1850W
CO M B INATIO N 2600W (S im ultaneous) 1550W (S equential)
M IC RO WAVE EN ER G Y O U TP UT 1000W (IE C705) 1000W (IE C705)
M IC RO WAVE FR EQ UE NC Y 2450M Hz 2450M Hz
O U TS IDE DIM E N SIO N S (W X H X D ) 526 x 345 x 482 m m (20.7 x 13.6 x 19.0 in.)
CAVITY D IM EN SIO NS (W X H X D) 335 x 250 x 339 m m (13.2 x 9.8 x 13.3 in.)
NE T W EIG HT AP PR O X . 21 Kg (46.3 lbs.)
TIM ER 60 m inutes
FU NC TIO N SELE CTIO NS M ICR O W AV E/G RILL/C O N VECTIO N /CO M BI
PO W E R SELE CTIO NS 10 LE VE LS
CAVITY V O LUM E 1.0 Cu.Ft.
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
EXTERNAL VIEW
1. OUTER DIMENSION
KOC-970T
Fig.1 Front view Fig.2 Side view
KOC980T
Fig.1 Front view Fig.2 Side view
EXTERNAL VIEW
2. FEATURE DIAGRAM
KOC-970T
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2. Door hook - When the door is closed, it will automatically shut. If the door is opened while
the oven is operating, the magnetron will immediately stop operating.
3. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
4. Top heater - Turns on when convection, grill and combi cooking is selected.
5. Oven lamp - Automatically turns on during oven operating.
6. Safety interlock system
7. Control panel
8. Turntable tray - Rotates during cooking and ensure even distribution of Microwaves.
It can also be used as a cooking utensil.
9. Oven front plate
10. Rotating base - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.
It should only be removed for cleaning.
11. Under heater
EXTERNAL VIEW
KOC980T
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating,
the magnetron will immediately stop operating.
3. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
4. Top heater - Turns on when convection, grill and combi cooking is selected.
5. Oven lamp - Automatically turns on during oven operating.
6. Safety interlock system
7. Control panel
8. Turntable tray - Rotates during cooking and ensure even distribution of Microwaves.
It can also be used as a cooking utensil.
9. Oven front plate
10. Rotating base - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.
It should only be removed for cleaning.
11. Under heater
12. Metal rack
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