Service Manual
Microwave Oven
Model: KOC-1C0K5S
S/M No. :
Jul. 2013
✔ 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).
1
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.
TABLE OF CONTENTS
1. SAFETY AND PRECAUTIONS ...................................................................................................................................2
2. SPECIFICATION ..........................................................................................................................................................3
3. INSTALLATION ...........................................................................................................................................................4
4. CONTROL PANEL ......................................................................................................................................................5
5. DISPLAY WINDOW .....................................................................................................................................................6
6. ACCESSORIES ...........................................................................................................................................................7
7. INTERLOCK MECHANISM AND ADJUSTMENT ......................................................................................................8
8. WIRING PROCEDURE ................................................................................................................................................9
9. WIRING DIAGRAM ....................................................................................................................................................10
10. ELECTRICAL PARTS LIST ....................................................................................................................................11
11. DISASSEMBLY AND ASSEMBLY ..........................................................................................................................12
12. COMPONENT TEST PROCEDURE .......................................................................................................................25
13. TROUBLE SHOOTING GUIDE ...............................................................................................................................28
14. PRINTED CIRCUIT BOARD ...................................................................................................................................34
2
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.
(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 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’ or by earth symbol 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 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.
3
2. SPECIFICATIONS
MODEL KOC-1C0K5S
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH earthing
MICROWAVE 1450W
POWER GRILL 1250W
CONSUMPTION CONVECTION 2650W
COMBINATION 2750W, MAX 2900W
MICROWAVE ENERGY OUTPUT 800W (IEC705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 524X375X477mm(20.63X14.76X18.78in)
CAVITY DIMENSIONS (W X H X D) 400x233x365mm(15.75x9.17x14.37in)
NET WEIGHT Approx. 25kg(55.06 lbs)
FUNCTION SELECTIONS MICROWAVE/ GRILL/ CONVECTION/ COMBINATION
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.3 Cu.Ft (34ὀ)
* Specifications are subject to change without notice.
4
3. 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 15 amperes, 230V, 50Hz.
• Power supply cord is about 1.5 meters long.
• The voltage used must be the same as specified on this oven. Using a higher voltage may 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 outlet that is properly installed and earthed.
EARTHING INSTRUCTIONS
WARNING
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician of serviceman if the earthing instructions are not completely understood, or if doubt
exists as to whether 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 accept the plug on 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.
5
4. CONTROL PANEL
1 Display
The display shows you some information such as
cooking time, menu, quantity and temperature and so
on.
2 Quick defrost( ) Button
You can defrost a 500 grams of food quickly and
easily.
3 Steam cleaning() Button
This function helps you to clean the inside of oven.
4 Deodorization( ) Button
The oven has a special function to blow off smells in
the oven.
5 Menu Dial Knob :
You can choose a cooking menu by turning the Menu
Dial knob.
6 Control Dial Knob () :
You can enter cooking time, quantity, weight, and
temperature by turning the Control Dial knob.
7 Selection() Button: You can confirm the contents
you entered by pressing the Selection button.
8 Start/Speedy Cook () Button:
- You can start cooking immediately by pressing the
Start button after entering cooking information such
as cooking time, power level and so on.
- You can start the Microwave cook at power level 10
quickly by pressing the Start button.
You can add 30 seconds to the cooking time up to 5
minutes each time the Start button is pressed.
9 Stop/Clear() Button:
It is used for stopping the oven operation or clearing
the display.
6
5. DISPLAY WINDOW
1 Display window
The display shows you some cooking information such
as cooking time, clock, temperature, quantity and so on.
2 Icons of cookware
: It means a Grill rack. If lights in the display ,
use a grill rack for cooking.
: It means a Metal tray. If lights in the display ,
use a metal tray for cooking.
3 Icons of operation guide
: It means the Control dial knob. If blinks, turn
the control dial knob.
: It means the Selection button. If blinks, press
the selection button.
: It means the Start button. If blinks, press the
start/speedy cook button.
4 Icons of voice guide function
: It means the Voice guide function. If the voice
guide function is activated, turns on in the
display. (OPTIONAL)
(Refer to “Setting the volume level” on the page 9.)
5 Icons of cooking menu
: It means Quick defrost. lights in the display
during Quick defrosting.
: It means Steam cleaning. lights in the display
during Steam cleaning.
: It means Deodorization. lights in the display
during Deodorization.
: It means Convection cook. lights in the display
during Convection cooking.
: It means Grill cook. lights in the display during
Grill cooking.
: It means Combination cook. lights in the
display during Combination cooking.
: It means Microwave cook. lights in the display
during Microwave cooking.
: It means Auto defrost. lights in the display
during Auto defrosting.
: It means Auto cook. lights in the display during
Auto cook.
: It means Instant cook. lights in the display
during Instant cook.
: It means Fermentation. lights in the display
during Fermentation.
: It means Memory cook. lights in the display
during Memory cook.
: It means Preheating. lights in the display
during preheating in Convection cooking.
7
6. ACCESSORIES
This oven is equipped with several accessories. They can be used in various ways to facilitate cooking.
1 Metal Tray - Put food or proper cookware on the metal tray.
2 Grill Rack - Put the grill rack on the metal tray.
It should be always used with the metal tray for
cooking.
■ HOW TO USE THE ACCESSORIES OF COOKING
■ Metal Tray
NOTE : Metal Tray is attached to the left cushion.
• Microwave cooking
• Auto defrosting
• Quick defrosting
• Fermentation
• Memory cooking
• Convection cooking
• Auto cook menu: 3, 5
• Instant cook menu: 1, 5
1
2
8
7. INTERLOCK MECHANISM AND ADJUSTMENT
CONDITION : DOOR OPEN
RED/RED
RED/RED
BLACK/BLUE
WHITE/BLUE
WHITE
BLUE
YELLOW
BLUE
LEFT RIGHT
CONDITION : DOOR CLOSE
LEFT RIGHT
INTERLOCK
MONITOR
SWITCH
DOM
SWITCH
HOOK
PRIMARY
INTERLOCK
SWITCH
9
1 MW RELAY Black & White, Black & White Control M/W
2 HALOGEN HEATER RELAY White & Red, Black Control halogen heater(Side heater)
3 TOP HEATER RELAY White & Black, Black Control heater top
4 CONVECTION RELAY Blue, Blue Control heater back
5 SLOW ACTING RELAY Blue, Blue
6 D.O.M CONNECTOR Blue, Green(Middle), Blue
7 SUB RELAY
8 THERMISTER CONNECTOR White, White Temperature sensor
LOCATION
PART NAME WIRING COLOR FUNCTION
8. WIRING PROCEDURE
MAIN PCB
NO. 1 : Red
NO. 3 : White
NO. 5 : Black
NO. 7 : Blue
NO. 9 : Grey
Prevent the current of oven from rising rapidly in
Microwave Mode
D.O.M(DOOR OPEN MONITOR) helps the
MICOM checking the Interlocking system of DOOR
NO. 1 & 3 : Supply power to PCB
NO. 5 : Convection motor
NO. 7 : Blower-Motor
NO. 9 : Lamp
8 7 6
5
1
2
3
4
10
9. WIRING DIAGRAM
CAPACITOR
H.V.
FUSE
H.V.
MAGNETRON
H.V. DIODE
THERMISTOR
TRANSFORMER
HIGH VOLTAGE
RD
SWITCH
NC.
COM.
MONITOR
INTERLOCK
RD
BL
SWITCH
NO.
PRIMARY
INTERLOCK
COM.
THERMAL
STEAM HEATER
BL
THERMAL CUT-OUT
CONVECTION HEATER
CUT-OUT
RD
BK
RD
RD
BL
BL
THERMAL
CUT-OUT
TOP HEATER
RD
BK
CM
FM
OL
BL
TOP HEATER
CONVECTION HEATER
BL
WH
BL
D.O.M. SWITCH
WH
STEAM HEATER
GY
SWITCH
SECONDARY
WH
BK
INTERLOCK
WH
PTC
BK
BL
BK
BL
GY
RD
RD
BL
CONVECTION
FAN
LAMP
WH
CONTROL P.W.B. ASS'Y
SLOW ACTING
RELAY
RELAY
HEATER
STEAM
POWER
RELAY
HEATER
TOP
RELAY
HEATER
CONVECTION
RELAY
FAN
RELAY
RELAY
RELAY
T/MOTOR
BL:BLUE
GY:GRAY
GN:GREEN
WH:WHITE
YW:YELLOW
BK:BLACK
RD:RED
OL:OVEN LAMP
NOTE :
BR:BROWN
FM:FAN MOTOR
CM:Convection motor
RD
L
FUSE
L
LINE FILTER ASS'Y
BR
L
ONLY
SINGLE PHASE
POWER SUPPLY :
BL
RD
WH
WH
GN
N
N
GE
N
L.V. TRANSFORMER
DOOR : CLOSED
COOK : OFF
[CONDITION]
11
1 3518302301 CAPACITOR HV 2100VAC 1.10UF #187 80MM 1
2 3518400800 DIODE HV ESJC13-12BX (CL01-12) 1
3 3513601710 LAMP BL 240V 25W T25 CC7A H187 99% 1
4 3512784230 HARNESS MAIN KOC-1C0K5S 1
5 3512783910 HARNESS CONVECTION AS KOC-1C0KKS 1
6 3518701900 FUSE H.V 5kV 0.8A T.H.V. 060T 1
74415A17352 SW MICRO SZM-V16-FA-63 2
84415A66600 SW MICRO SZM-V16-FA-62 1
9 3512808510 HEATER 230V 1200W 1
10 3518125200 TRANS HV R1S58D 1
11 3518606880 NOISE-FILTER DWLF-M27-4 1
12 35113A5Q0T CORD POWER AS 3X1.5 80X80 120-RTML 1.6M 1
13 3518003710 MAGNETRON 2M218HFL 6CF 1
14 3518904000 THERMOSTAT OFF:120 ON:105 V #187 BRAKET 1
15 3518903200 THERMOSTAT OFF:145 ON:135 V #187 BRAKET 1
16 3963513950 MOTOR SHADED POLE 230V 50HZ OEM-10DWC2-T08 1
17 3512808000 HEATER 230V 1400W / 220V 1280W KAWAI 1
18 3963320200 MOTOR BLOWER 220V 60HZ OEB-2505B1 1
NO PART CODE PART NAME SPECIFICATION Q’TY REMARK
12
11. 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 safe
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 wear rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven components or wiring.
(1) Check the grounding.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used while grounded.
It is imperative, therefore, to make sure it is grounded
properly before beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation has stopped, 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.
CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.
WARNING : When servicing the appliance, take care when 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.
13
12. DISASSEMBLY AND ASSEMBLY
1. To remove cabinet
1) Remove four screws on cabinet back.
2) Push the cabinet backward.
2. To remove door ASS'Y
1) Remove each two screws (total 4EA) on left and right
sides.
2) Remove spring hinges in both sides.
* It is easy to remove the bottom of spring firstly and to
set the top of spring firstly.
3) Remove HINGE TOP *R and HINGE TOP *L.
* HINGE TOP must be connected to the inside of DOOR.
4) Reverse the above steps for reassembly.
3. To remove C-Panel ASS'Y
1) Remove the screws.
2) Slide the C-PANEL in the direction of left and pull out
forward.
3) Reverse the above steps for reassembly.
SPRING HINGE
14
4. EXPLODED VIEW AND PARTS LIST OF DOOR ASS'Y.
A01 3512603830 HANDLE DOOR *O ABS SPRAY KOC-1C0KQS 1
A02 3515309510 SUPPROTER HANDLE PO T1.6 1
A03 3512603910 HANDLE DOOR *I ABS 1
A04 3517010740 BARRIER-SCREEN *O TEMP GLASS T3.2 BLACK 1
A05 3512210320 FRAME DOOR
PC+ABS HR-5007A SPRAY KOC-1C0KQS
1
A06 3513304620 INSULATOR GLASS T2.0 TEMPERED 1
A07 3513003100 HOLDER INNER GLASS *R PBT 1
A08 3511728810 DOOR PAINTING AS KOC-1C0KQS 1
A09 3512902020 HINGE HOOK SWRM3 2
A10 3513102110 HOOK POM 2
A11 3512303000 GASKET DOOR PBT 1
A12 3512902000 HINGE UNDER *L AS KOC-1C0KQS 1
A13 3512902010 HINGE UNDER *R AS KOC-1C0KQS 1
A14 3515103600 SPRING HOOK PW1 2
A15 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 3
A16 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 4
A17 3513003100 HOLDER INNER GLASS *R PBT 1
A18 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
A19 7121401211 SCREW TAPPING T2S PAN 4X12 MFZN 2
A20 7121400612 SCREW TAPPING T2S PAN 4X7 MFZN 3
NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
DOOR AS : 3511728890
15
5. EXPLODED VIEW AND PARTS LIST OF CONTROL PANEL.
B01 3511620100 DECORATOR C-PANEL SAN T1.5 BLACK 1
B02 3516725930 CONTROL-PANEL
PC+ABS HR-5007A SPRAY KOC-1C0KPSA8
1
B03 3516913020 BUTTON FUNCTION-A ABS COATING 2
B04 3516913010 DECORATOR KNOB ABS COATING 2
B05 3513411530 KNOB VOLUME ABS SPRAY KOC-1C0KQS 2
B06 3514333150 PCB MAIN AS KOC-1C0K5SV0 1
B07 3514333220 PCB SUB1 AS KOC-1C0K5S (GLOBAL) 1
B08 3514333300 PCB SUB2 AS KOC-1C0KQS 1
B10 7621301011 SCREW TAPPING T2S PAN 3X10 PW MFZN 9
B11 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7
NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
CONTROL-PANEL AS : PKCPSWALB0
B01 B02 B03 B04 B05 B06 B07 B08
B11
16
6. To remove high voltage capacitor
1) Remove a screw which secure the grounding ring
terminal of the H.V.diode and capacitor holder.
2) Remove the H.V.capacitor from the capacitor holder.
3) Remove the H.V.diode from the H.V.Capacitor.
4) Reverse the above steps for reassembly.
1) Connect two terminals(1) from H.V. transformer to
magnetron using the all-in-one connector.
2) Connect the connector, which connected two wires(2)
from H.V. transformer, to H.V. capacitor .
3) Connect H.V. diode(3) to H.V. capacitor in same
location with terminal 2
4) The one direction of 4 connect to secondary terminal of
H.V. transformer and another connect to H.V
capacitor(except of terminal 2, 3)
NOTE: Connecting procedure of magnetron, H.V.
transformer, H.V, diode, H.V. fuse, H.V.
capacitor.
Capacitor Holder
H.V.Capacitor
H.V.Diode
17
7. TO REMOVE MAGNETRON
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
NOTE: Never install the magnetron without the metallic gasket plate which is packed with each magnetron to
prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave
leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
g
Metallic
gasket
plate
Cooling fin
Filament
terminal
Magnetron
antenna
<MAGNETRON>
Wave guide Magnetron antenna
Metallic
asket plate
18
9. TO REMOVE H.V.TRANSFORMER
1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transformer.
3) Reverse the above steps for reassembly.
8. TO REMOVE BLOWER MOTOR
1) Remove a screw which secure the cover motor blower.
2) Remove a screw which secure the blower motor.
3) Remove the cover motor blower.
4) Remove the wire which connecting the blower motor
5) Push a latch of blower motor and draw backward
6) Reverse the above steps for reassembly.
LATCH
COVER MOTOR BLOWER
BLOWER MOTOR
19
10. TO REMOVE TOP HEATER
1) Remove a nut which secure the top heater.
2) Pull out the heater.
11. TO REMOVE HALOGEN HEATER (OPTIONAL)
(SIDE HEATER)
1) Remove a screw in insulator heater top.
2) Remove the wire which connecting the halogen heater.
3) Remove a screw on cover of halogen heater.
4) Remove a bracket of halogen heater.
5) Remove a halogen heater.
6) Reverse the above steps for reassembly.
Halogen heater cover
Halogen heater
braket
20
12. TO REMOVE NOISE FILTER
1) Remove a screw which secure the noise filter.
2) Remove a screw which earth to wire from noise filter.
3) Remove a noise filter from the bracket noise filter.
13. TO REMOVE SPEAKER (OPTIONAL)
1) Remove a screw which secure the base plate and
speaker holder
2) Remove speaker holder and speaker
21
15. EXPLODE VIEW AND PARTS LIST OF BACK HEATER ASSEMBLY
C01 7S628W40X1 NUT HEX NUT FLANGE M4X0.7P MFZN 1
C02 3511800700 FAN CONVECTION SA1D T0.5 1
C03 3512808000 HEATER 230V 1400W KAWAI 1
C04 3512806000 HEATER REFLECTOR SA1D T0.5 1
C05 3511409800 COVER HEATER *B SA1D-80 T0.5 1
C06 3513303400 INSULATOR HEATER *B SBHG-1 T0.5 1
C07 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 6
C08 3963513950 MOTOR SHADED POLE 230V 50HZ ,OEM-10DWC2-T08 1
C09 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1
C10 3518903200 THERMOSTAT OFF:145 ON:135 V #187 1
C11 7601400811 SCREW MACHINE PAN 4X8 PW MFZN 2
C12 3512783940 HARNESS CONVECTION AS KOC-1C4K5SC1 1
C13 3513002300 HOLDER HEATER SUS304 T0.5 3
C14 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 3
C15 7400104011 WASHER PLAIN PW-1-4 MFZN 1
NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
C01 C02 C03 C04 C05 C06 C07 C08
C14 C12 C10 C09C11C13C15
22
16. TOTAL ASSEMBLY AND PARTS LIST
F02 F03 F05 F06 F07 F08 F09 F10 F11 F12 F13
F01
F55
F78
F59
F60
F56
F54
F53
F57
F58
F61
F62
F63
F41
F77
F50
F44
F43
B00
A00
F42
F69
F71
F35
F51
F49
F52
F68
F70
F37
F36
F40
F38
F39
F27F28F29F30F31F32
F14
F15
F16
F17F18F20F21F22F23F25
23
A00 3511728890 DOOR AS KOC-1C0K5S BK 1
B00 PKCPSWALB0 CONTROL-PANEL AS KOC-1C0K5S 1
F02 3510611600 BRACKET NOISE FILTER PP 1
F03 3518606880 NOISE FILTER DWLF-M27-4 250V 15A 1
F05 3513001900 HOLDER HV CAPACITOR SECC T0.5 1
F06 3518303901 CAPACITOR HV 2100VAC 1.1UF #187+3 1
F07 3518701900 FUSE HV 5KV 0.8A T.H.V.060T 1
F08 3518125200 TRANS HV R1S58D 1
F09 3513005300 HOLDER LAMP STS T0.4 1
F10 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 2
F11 35113A5Q0T CORD POWER AS 3X1.5 80X80 120-RTML 1.6M 1
F12 3517505210 PROTECTOR HEAT STS T0.6 1
F13 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 2
F14 3510810920 CABINET AS KOC-1C0KQS 1
F15 3511415000 COVER *B SBHG T0.8 1
F16 3512808410 HEATER *B AS KOC-1C0K5S 1
F17 3963320200 MOTOR BLOWER 220V~240V 60Hz OEM-2505B1 1
F18 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 2
F20 3511415200 COVER MOTOR BLOWER PP(TB-53) 1
F21 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1
F22 3518003710 MAGNETRON 2M218HFL 6CF 1
F24 3512784230 HARNESS MAIN KOC-1C0K5S 1
F27 3510613030 BRACKET ROLLER *R AS KOC-1C0KQS 1
F28 3516003700 SCREW SPECIAL TTS HEX 4X8 FLG MFZN 4
F29 3510313410 BASE SBHG T0.7 1
F30 7122401211 SCREW TAPPING T2 TRS 4X12 MFZN 1
F31 3512101400 FOOT DASF-310 2
F32 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 9
F35 7272400811 SCREW TAPTIE TT3 TRS 4X8 MFZN 4
F36 3515103500 SPRING HINGE PW1 2
F37 3510611900 HINGE TOP *R PO T2.6 1
F38 3513821210 LOCK *R PBT EE-2306F(V0) 1
F39 4415A17352 SW MICRO VP-533-OF SPNO #187 200G 1
4415A66600 SW MICRO SZM-V16-FA-62 1
F40 3514801900 SENSER TEMPERATURE PTM-K312-D10 1
F42 3512808510 HEATER GRILL 230V 1200W 1
F43 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 4
F44 3511408320 COVER WAVE GUIDE MICA T1.0 1
F49 3513821220 LOCK *L PBT EE-2306F(V0) 1
NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
24
F50 4415A17352 SW MICRO SZM-V16-FA-63 1
F51 3513703700 LEVER LOCK POM 1
F52 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 6
F53 3513304610 INSULATOR HEATER *T SBHG T0.8 1
F54 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 5
F55 3518400800 DIODE HV AS DIODE HV AS 1
F56 7122400811 SCREW TAPPING T2S TRS 4X8 MFZN 1
F57 3513601710 LAMP BL 240V 25W T25 CC7A H187 99% 1
F58 3511407810 COVER LAMP T/GLASS T2.0 1
F59 7122400811 SCREW TAPPING HVR-1X-3AB 12KV #187 1
F60 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 3
F61 3512529710 GUIDE WIND SECC T0.4 1
F62 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1
F63 3518904000 THERMOSTAT OFF:120 ON:105 V #187 1
F68 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
F69 3510611910 HINGE TOP *L PO T2.6 1
F70 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 1
F71 3510613020 BRACKET ROLLER *L AS KOC-1C0KQS 1
F77 3517212100 TRAY METAL AS KOC-1C0KQS 1
F78 3517212400 TRAY RACK AS KOC-1C0KQS 1
NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
25
12. COMPONENT TEST PROCEDURE
• High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.
• It is neither necessary nor advisable to attempt measurement of the high voltage.
• Before touching any oven components or wiring, always unplug the oven from its power source and discharge the
capacitor.
• To measure resistance of each component, refer to figures.
1. High voltage transformer
1) Remove connections from the transformer terminals and check continuity.
2) Normal readings should be as follows :
1 Secondary winding ... Approx. 130Ω ~ 160Ω
2 Filament winding ... Approx. 0.2Ω ~ 0.4Ω
3 Primary winding ... Approx. 1.3Ω ~ 2.1Ω
2. High voltage capacitor
1) Check continuity of capacitor with meter on the highest OHM scale.
2) A normal capacitor will show continuity for a short time, and then indicate 10MΩ once
the capacitor charged.
3) A shorted capacitor will show continuous continuity.
4) An open capacitor will show constant 10MΩ ..
5) Resistance between each terminal and chassis should be infinite.
4. Magnetron
For complete magnetron diagnosis, refer to "Measurement of the Microwave Power
Output." Continuity checks can only indicate and open filament or a shorted magnetron.
To diagnose for an open filament or a shorted magnetron,
1) Isolate magnetron from the circuit by disconnecting the leads.
2) A continuity check across magnetron filament terminals should indicate 0.1Ω or less.
3) A continuity check between each filament terminal and magnetron case should read
open.
5. Fuse
If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch
before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch
and fuse at the same time. Replace just the fuse if the switches operate normally.
3
2
1
Measuring point
Measuring
point
26
5. BLOWER MOTOR AND CONVECTION MOTOR
1) Remove a connector from the motor.
2) Measure resistance between two terminals like as following figure.
3) Reading of blower motor is 60Ω and convection motor is 270Ω .
4) It is normal to stop convection motor smoothly, when door is open during convection mode.
=> You can see the motion of convection motor,
6. HEATER (TOP HEATER, REAR HEATER, HALOGEN HEATER)
1) Remove a connector from the heater
2) Measure resistance between two terminals like as following figure.
3) Normal readings of top heater, rear heater and halogen heater are 36Ω , 36Ω , 23Ω .
4) The oven should be cooled enough to measure resistance of the heater.
7. NOISE FILTER
1) Remove a connector from the noise filter.
2) Check each continuity of N-N and L-L terminal like as following figure.
3) It should be normal to keep continuous continuity.
L-L
N-N
BLOWER MOTOR CONVECTION MOTOR
TOP HEATER REAR HEATER HALOGEN HEATER
Measuring
point
Measuring
point
Measuring
point
Measuring
point
Measuring
point
27
11. THERMOSTAT (Anti-superheating device)
Thermostat shut off power supply through opening connection of terminals,
when product arrive in particular temperature by superheating.
Measuring
point
8. POWER CODE
1) Remove a connector from the power code.
2) Check each continuity of N-N and L-L terminal like as following figure.
3) It should be normal to keep continuous continuity.
L-L
N-N
9. INTERLOCK SWITCH
There are three terminals in interlock switch : COM, NO, NC.
1) NC and COM terminals are connected by ordinary condition.
2) NO and COM terminals are connected by pushing a button terminal.
It is the same to two terminal interlock switch and Confirm the connection of
terminals by pushing button terminal to check continuity of interlock switch.
BUTTON
NC
NO
COM
10. THERMESTER (Temperature sensor)
Thermester is a variable resistance by temperature. Normal resistance
should be 200~300Ω in ambient(room) temperature.
Measuring
point
28
13. TROUBLE SHOOTING GUIDE
1. Check points
Yes
No
CHECK
Check continuity of main fuse No continuity Replace main fuse
RESULT CAUSE AND REMEDY
Yes
replace the control panel and
check the power
Display shows
The problem was caused by
the control panel
Yes
Check continuity of power code,
noise filter
Power code :
Check continuity
of N-N and L-L
terminals.
Noise filter :
Check continuity
of N-N and L-L
terminals.
Replace the components
which are no continuity
No
Following the procedure below to check if the oven is defective or not.
1) Check grounding before checking trouble
2) Be careful of the high voltage circuit.
3) Discharge the high voltage capacitor.
4) When checking the continuity of the switches, fuse or high voltage tranformer, check continuity with the AC plug
removed. To do otherwise may result in a false reading or damage to your meter or harmful to your body
TROUBLE 1) Despite plugging the cord into the outlet , but the display doesn't show.
NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire harness, wiring and connection of the terminals and power cord before check the parts
listed below.
29
2. Check points after repair
- After repair or replacement of parts, operate the oven in M/W mode.
There will be occur following problems.
2-1) Display doesn't show again, after opening and closing the door
CHECK
Check the continuity between
the primary interlock switch and
the monitor switch
find the trouble in
switch
1) Replace switch
2) Replace main fuse
RESULT CAUSE AND REMEDY
CHECK
Check the connecting location of
H.V. transformer, H.V. diode and
H.V. capacitor
False connection
1) Modify connection
2) Replace main fuse
RESULT CAUSE AND REMEDY
Right connection
1) Replace H.V. transformer
2) Replace main fuse
2-2) There is no problem during opening and closing the door, but display doesn't show as soon
as the oven operate in Microwave mode
30
1. Check points
CHECK RESULT CAUSE AND REMEDY
Trouble2) Although display shows, No microwave oscillation or the oven does not start cooking
2. Check points after repair
- After repair or replacement of parts, operate the oven in Microwave mode.
- Operate M/W mode using a cup of water about 300ml and check the water grow warm.
- You need to reconfirm the above guidances in trouble again.
Yes
No
Check contact of door hook to
primary interlock switch, monitor
switch and DOM switch
Fault contacts
Modify location of door and
door hook or replace door
assembly
Yes Check
Check continuity of monitor
switch and DOM switch
No continuity
Replace switch which
causes a problem
No
No
No
No
No
Yes
Check insertion of DOM terminal
to PCB
No
insertion
Replace
high voltage fuse
Yes
Check continuity of high voltage
fuse
No
continuity
Replace
high voltage fuse
Yes
Check the resistance of H.V.
transformer
Resistance of
H.V. transformer
is higher or lower
than the standard
Replace H.V. transformer
Yes
Check continuity of M/W RELAY
No
continuity
Replace Control Assembly
Yes
Check the problems of
magnetron
Resistance of
magnetron is lower
than the standard
or Insulation is
defected
Replace magnetron
31
1. Check points
CHECK RESULT CAUSE AND REMEDY
TROUBLE3) Although display shows, oven cooking is not operated
(Including operating problems of start button)
2. Check points after repair
- After repair or replacement of parts, operate the oven in convection 200°C during 10 minutes
- Check the cavity grow warm
- You need to reconfirm the above guidances in trouble again.
Yes
No
Check contact of door hook to
primary interlock switch, monitor
switch and DOM switch
Fault contacts
Modify location of door and
door hook or replace door
assembly
Yes
Check continuity of monitor
switch and DOM switch
No continuity
Replace switch which cause
a problem
No
Yes
Check insertion of DOM terminal
to PCB
No
insertion
Insert DOM terminal to PCB
No
Yes
Check resistance of top heater,
back heater and halogen heater
Resistance of
heater is lower or
higher than the
standard
Replace heater which
causes a problem
No
Yes
Check continuity of all the heater
relay
No continuity Replace Control Assembly
No
Yes
Check resistance and rotation of
convection fan motor and blower
motor
Resistance of
convection fan
motor and blower
motor are lower or
higher than the
standard, so that
rotation does not
stop smoothly
Replace motor which causes
a problem
32
Trouble4) When "ERROR2" or "ERROR3" come on display
When does happen these ERRORs ?
Error3 happen that the temperature sensor (thermister) dosen't connect to P.C.B
connector
Error2 happens if the temperature of cavity is very high
After the oven is cooled enough, operate again
If Display show "Err2" again, following the below procedure
DISPLAY
CAUSE
REMEDY
CONDITION CHECK
Check continuity of thermistor
(resistance of thermistor)
Defective
thermistor
RESULT
0Ω or infinite
Replace
“ERROR 2 &
ERROR 3”
come on
display
Check continuity of heater
(convection, upper, lower)
Defective touch
control circuit
Replace
Approx
200k~300kΩ
(room
temperature)
Defective
heater
No
continuty
continuity
Replace
33
CONDITION CHECK
Check each button for
continuity of the button
Malfunction of sub
pcb assembly
RESULT
Normal
CAUSE REMEDY
Replace sub
pcb assembly
Display does
not show
programming
at all, even if
keyboard is
touched.
TROUBLE 5) The following visual conditions indicate a probable defective touch control Circuit or button
P.C.B. assembly
1. Incomplete segments.
1) segment missing
2) partial segments missing
3) digit flickering other than normal fluorescent slight flickering
2. A distinct change in the brightness of one or more numbers exists in the display
3. One or more digits in the display are not on when they should be.
4. Display does not count down or up with time cooking or clock operation.
5. Oven is programmable and cooks normally but no display shows.
6. Display obviously jumps in time while counting down.
7. Display counts down noticeably too fast while cooking.
8. Display does not show the time of day when clear button is touched.
9.Oven lamp and turn table motor do not stop although cooking is finished.
34
14. PRINTED CIRCUIT BOARD
1 MW R ELAY Control M/W
2 HALOGEN HEATER RELAY Control halogen heater (side heater)
3 TOP HEATER RELAY Control top heater
4 CONVECTION RELAY Control back heater
5 SLOW ACTING RELAY Prevent the transient current (while)operating M/W
6 DOM Let a micon decide Open and close of door
7 SUB R ELAY
8 THERMISTER Temperature sensor
LOCATION PART NAME FUNCTION
MAIN PCB
NO. 1 & 3 : Supply power to PCB
NO. 5 : Convection motor
NO. 7 : Blower-Motor
NO. 9 : Lamp
8 7 6
5
1
2
3
4
35
PCB PATTERN DIAGRAM
12V
5V
GND
S/M NO. :
DAEWOO ELECTRONICS CORP.
1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
PRINTED DATE: Jul. 2013
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