Daewoo KOC-972T0S, KOC-972T2S, KOC-982T1S, KOC-982T2S, KOC-983T1S Service Manual
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Service Manual
Microwave Oven
Model: KOC-972T0S
KOC-972T2S
KOC-982T1S
KOC-982T2S
KOC-983T1S
KOC-983T2S
KOC-984T1S
KOC-984T2S
KOC-985T1S
KOC-985T2S
DAEWOO ELECTRONICS CO., LTD.
S/M No. : C972T0S002
SAFETY AND PRECAUTIONS........................................................................................................... 2
SPECIFICATIONS............................................................................................................................... 3
EXTERNAL VIEW................................................................................................................................ 4
1. OUTER DIMENSION..................................................................................................................... 4
2. FEATURE DIAGRAM................................................................................................................... 5
INSTALLATION................................................................................................................................... 7
EARTHING INSTRUCTIONS............................................................................................................... 7
CONTROL PANEL ................. ................................................ ............................................................. 8
DISASSEMBLY AND ASSEMBLY...................................................................................................... 9
INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 23
TROUBLE SHO OTING GUIDE ....... ... ..................... ............................................... ............................. 24
MEASUREMENT AND TEST...................................................................................... ......... ......... ..... . 30
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 30
2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH................................................. 31
3. MICROWAVE RADIATION TEST................................................................................................. 32
4. COMPONENT TEST PROCEDURE............................................................................................. 33
WIRING DIAGRAM.............................................................................................................................. 34
SCHEMATIC DIAGRAM...................................................................................................................... 35
EXPLODED VIEWS AND PARTS LIST.............................................................................................. 38
PRINTED WIRING BOARD................................................................................................................. 44
P.C.B. CIRCUIT DIAGRAM..................................................................................................... ............ 49
(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 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.
(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.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSI VE MICROW AVE E NERGY
SAFETY AND PRE CAU T IONS
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.
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.
IMPORTANT
This oven is designed for counter-top use only.
NOTE
SPECIFICATIONS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
MOD EL KOC-972T0S KOC-972T2S
POWER S U P P LY 230V~50Hz 230V~50Hz
POWER CONSUMPTION
MICROWAVE 1450W 1450W
GRILL 1200W 1200W
CONVECTION 1550W 1550W
PRO G R A M COOK 1850W 1850W
COM BINATION 2600W (Simultaneous) 1550W (Sequential)
MICROW AVE ENER GY O U TPUT 950W(IEC705) 950W(IEC705)
MICROW AVE FREQ UEN CY 2450MHz 2450MHz
OUTSIDE DIMEN SIONS (W X H X D) 526 x 345 x 413 mm (20.7 x 13.6 x 16.1 in.)
CAVITY DIMEN SIONS (W X H X D) 335 x 255 x 339 mm (13.2 x 10.0 x 13.3 in.)
NET W EIGHT APPROX . 20 Kg (44.2 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS MICROWAVE/GRILL/CONVECTION/COMBI
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.0 Cu.Ft.
MOD E L KOC -982T/983T/984T/985T1S KOC-982T/983T/984T/985T2S
POWER S U P P LY 230V~50Hz 230V~50Hz
POWER CONSUMPTION
MICROWAVE 1450W 1450W
GRILL 1200W 1200W
CONVECTION 1550W 1550W
PRO G R A M COOK 1850W 1850W
COM BINATION 2600W (Simultaneous) 1550W (Sequential)
MICROW AVE ENER GY O U TPUT 1000W(IEC705) 1000W(IEC705)
MICROW AVE FREQ UEN CY 2450MHz 2450MHz
OUTSIDE DIMEN SIONS (W X H X D) 526 x 345 x 496 mm (20.7 x 13.6 x 19.5 in.)
CAVITY DIMEN SIONS (W X H X D) 335 x 250 x 339 mm (13.2 x 9.8 x 13.3 in.)
NET W EIGHT APPROX . 21 Kg (46.3 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS MICROWAVE/GRILL/CONVECTION/COMBI
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.0 Cu.Ft.
EXTERNAL VIEW
1. OUTER DIMENSION
KOC-972T
KOC-982T/983T/984T/ 985T
EXTERNAL VIEW
2. FEATURE DIAGRAM
KOC-972T
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
6
EXTERNAL VIEW
KOC-982T/983T/984T/985T
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
13. Convection outlet & Fan
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
Check your local power source. This microwave oven requires a current of approximately 13amperes, 230 Volts, 50 Hz.
Power supply cord is about 1.2 meters long.
The voltage used must be the same as specified on this oven. Using a higher voltage m ay result in a fire or other accident
causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage resulting from use of
this oven with a voltage of ampere fuse other than those specified.
This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type.
Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.
6. Examine the oven after unpacking for any damage such as:
A misaligned door, broken door or a dent in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.
7. Do not operate the oven if it is colder than room temperature.
(This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating.
This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance is equipped with
a cord having a earthing wire with a earthing plug. The plug must be plugged into an outle t that is properly installe d and earthed.
EARTHING INSTRUCTIONS
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt
exists as to w hether the appliance is properly earthed, and either:
If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug,
and a 3-slot receptacle that will acc e pt the plu g o n the appliance.
The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance,
or Do not use an extension cord.
WARNING
C ONTROL PANEL
all information manually
put into the oven.
Stop/ Cl ear Button-
Used to pause and clear
more than 1.3 sec, number
is scrolled up aut omatically.
this button(pad) is pressed for
time and weight.
Used to input the cooking
Dial Kn ob-
Used to start the selected
cooking cycle and to set
(KOC-982T/983T/984T/985T)
time.
Start/Clock Button-
(KOC-972T)
cooking cycle.
Used to start the selected
Start Button-
increments.
cooking time in 30 sec
Used to program quickly
Speedy Cook Button(pad)-
PROGRAM COOK
COMBI : COMBINATION
TEMP : CONVECTION
DEFROST : TIME or WEIGHT
PIE
DEFROST
cooking m ode.
When blinking, the oven is
When blinking, the oven is
operating in "PROGRAM COOK"
operating in "PIE"
When blinking, the oven is
operating in "CONVECTION"
Used to select the variable
Microwave P ower Level-
microwave p ower level. If
cooking m ode.
cooking m ode.
cooking m ode.
operating in "COMBI"
When blinking, the oven is
When blinking, the oven is
operating in "GRILL"
When blinking, the oven is
operating in "MICROWAVE"
cooking m ode.
cooking m ode.
cooki ng func tion.
M/W : MICROWAVE
Used to select desired
Function Buttons(pads)-
scrolled up automatically.
1.3 sec, number is
is pressed for more than
temperature. If this button
Used to set desired
Temperature Button(pad)-
GRILL
mode.
When blinking, the oven i s
operating in "WEIGHT
DEFROST" cooking mode.
operating in "TIME
DEFROST" cooking mode.
When blinking, the oven i s
When blinking, the oven i s
operating in weght input
4.FISH FILLET
SPEEDY COOK
STOP/CLEAR
_
5.VEGETABLE
(START/CLOCK)
START
+
PROGRAM COOK
2.ROAST PORK
1.ROAST BEEF
3.ROAST CHICKEN
DEFROST
GRILL
M/W
PROGRAM
COOK
PIE
MW GRILL
COMBI
TEMP
PIE
KGTEMP
COOK
WEIGHT - TIMECOMBI
DEFROST
DISASSEMBLY AND ASSEMBLY
Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
It is completely safety during normal operation.
However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.
You are asked to observe the following precautions carefully.
1. Always remove the power plug from the outlet before servicing.
2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven components or wiring.
(1) Check the earthed.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used with earthed.
It is imperative, therefore, to make sure it is earthed properly before
beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation stopped and electric charge
remains in the high voltage capacitor.
When replacing or checking parts, short between oven chassis and
the negative high terminal of the high voltage capacitor,
by using a properly insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor switch;
replace primary interlock switch, secondary interlock
switch and interlock monitor switch.
5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.
6. Do not operate without cabinet.
Service personnel should remove their watches whenever working close to or replacing the magnetron.
CAUTION
When servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or
exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode.
WARNING
D ISASSE M B LY AND ASSEMBLY
1. To remove cabinet
(1) Remove four screws on cabinet back.
(2) Push the cabinet backward.
2. To remove guide wind assembly
(1) Remove two screws for earthing and for fixing to rear-plate.
(2) Remove the noise filter from the guide wind.
(3) Pull the fan from the motor shaft.
(4) Remove two screws which secure the motor shaded pole.
(5) Remove the motor shaded pole.
(6) Reverse the above steps for reassembly.
D ISASSEMBLY AND ASSEMBLY
3. To remove H.V.transformer
(1) Remove four screws which secure
the H.V.transformer to the base plate.
(2) Remove the H.V.transformer.
(3) Reverse the above steps for reassembly.
4. To remove high voltage capacitor
(1) Remove a screw which secure the grounding ring
terminal of the H.V. diode and the capacitor holder.
(2) Remove the H.V. diode from the capacitor holder.
(3) Reverse the above steps for reassembly.
High voltage circuit wiring
D ISASSE M B LY AND ASSEMBLY
5. To remove magnetron
(1) Remove three screws which secure the magnetron.
(2) Remove the magnetron.
(3) Reverse the above steps for reassembly.
Never install the magnetron without the m etallic gas k e t pla t e w h ic h is pa c k e d wit h e a c h magnetron to prevent
microw ave leakage. W henever repair w ork is carried out on magnetron, check the m icrowave leakage. It shall not
exceed 4mW /cm
2
for a fully assembled oven with door normally closed.
CAUTION
D ISASSEMBLY AND ASSEMBLY
6. To remove control panel assembly
KOC-972T, KOC-982T
(1) Remove a screw which secure the control panel assembly to
the oven front plate.
At the same time, draw forward the control panel assembly
from the oven front plate.
(2) Remove nine screws which secure the main and
sub PCB assembly to control panel.
(3) Remove buttons and dial knob.
REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK
B01 3516715120 CONT RO L-PA NE L ABS XR -401 1
B02 3515501210 WINDO W D ISPLAY PMMA IF-850 1
B03 3516905100 BUTTON FUN CTION-A ABS XR -401 1
B04 3516906200 BUTTON FUN CTION-B ABS XR -401 1
B05 3513404600 KNOB VO LUM E ABS XR -401 1
B06 3516906300 BUTTON FUN CTION-C ABS XR-401 2
B07 PKBPM SP500 PCB SUB AS KOC-972T, K O C-982T 1
B08 7621301011 SCRE W TAPPING T2S PAN 3x10 PW MFZ N 6
B09 PKMP M SQ300 PCB M AIN AS KOC-972T0S 1
PKMP M SQ300 PCB M AIN AS KOC-972T2S 1
PKMP M SQ350 PCB M AIN AS KOC-982T1S 1
PKMP M SQ350 PCB M AIN AS KOC-982T2S 1
B10 7621301011 SCRE W TAPPING T2S PAN 3x10 PW MFZ N 3
14
KOC-983T
(1) Remove a screw which secure the control panel assembly to
the oven front plate.
At the same time, draw forward the control panel assembly
from the oven front plate.
(2) Remove ten screws which secure the main and
sub PCB assembly to control panel.
(3) Remove buttons.
(4) Remove the knob volume.
REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK
B01 3516719220 CONTROL-PANEL ABS XR-401 1
B02 3511603120 DECORATOR C-PANEL PET T0.2 1
B03 3513405200 KNOB VOLUME ABS XR-401 1
B04 3516906300 BUTTON FUNCTION ABS XR-401 1
B05 PKBPMSYB00 PCB SUB AS KOC-984T 1
B06 7621301011 SCREW TAPPING T2S PAN 3X10 PW MFZN 6
B07 PKMPMSYB00 PCB MAIN AS
KOC-983T1S
KOC-983T2S
1
B08 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4
DISASSEMBLY AND ASSEMBLY
D ISASSEMBLY AND ASSEMBLY
KOC-984T
(1) Remove a screw which secure the control panel assembly to
the oven front plate.
At the same time, draw forward the control panel assembly
from the oven front plate.
(2) Remove the dial knob.
(3) Remove ten screws which secure the main and
sub PCB assembly to control panel.
(4) Remove buttons.
(5) Remove the decorator panel.
REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK
B01 3516719200 CONT RO L-PA NE L ABS XR -401 1
B02 3511602900 DECO R ATOR C/P *T STS304 T0.6 H/L 1
B03 3511603000 DECO R ATOR C/P *U STS304 T0.6 H/L 1
B04 3511603110 DECO R ATOR C-PA NE L PMM A IF-850 1 SMOG
B05 3511602800 DECO RATOR RING ABS XR -401 1 COATING
B06 3513404620 KNOB VO LUM E ABS XR -401 1 CO ATING
B07 3516905120 BUTTON FUN CTION ABS XR -401 1 CO ATING
B08 3516907200 BUTTON FUN CTION ABS XR -401 1 CO ATING
B09 3516906320 BUTTON FUN CTION ABS XR -401 2 CO ATING
B10 PKBPM SYB00 PCB SUB AS KOC-984T 1
B11 7621301011 SCREW TAPPING T2S PAN 3x10 PW MFZN 6
B12 PKMPMSYB00 PCB MAIN AS
KOC-984T1S
1
KOC-984T2S
B13 7122401211 SCRE W TAPPING T2S TRS 4x12 MFZN 4
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