ePapyrus PDF Document - [Daewoo Electronics Service Information
S/M No. :
OC9Q0T7S001
Service Manual
Microwave Oven
Model: KOC-9Q0T
✔
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).
Aug. 2008
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. SPECIFICATIONS ........................................................................................................................................................3
3. EXTERNAL VIEW.........................................................................................................................................................4
3-1. OUTER DIMENSION ..........................................................................................................................................4
3-2. FEATURE DIAGRAM .........................................................................................................................................5
4. INSTALLATION ............................................................................................................................................................6
5. CONTROL PANEL .......................................................................................................................................................7
6. DISASSEMBLY AND ASSEMBLY ..............................................................................................................................8
7. INTERLOCK MECHANISM AND ADJUSTMENT.....................................................................................................17
8. TROUBLE SHOOTING GUIDE ..................................................................................................................................18
9. MESUREMENT AND TEST .......................................................................................................................................23
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................23
9-2. MICROWAVE RADIATION TEST ....................................................................................................................24
9-3. COMPONENT TEST PROCEDURE................................................................................................................25
9-4. COMPONENT ACTION....................................................................................................................................26
10. WIRING DIAGRAM...................................................................................................................................................27
11. EXPLODED VIEW AND PARTS LIST .....................................................................................................................28
11-1. DOOR ASSEMBLY.........................................................................................................................................28
11-2. CONTROL PANEL ASSEMBLY.....................................................................................................................28
11-3. TOTAL ASSEMBLY ........................................................................................................................................28
12. PRINTED CIRCUIT BOARD ....................................................................................................................................31
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................36
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
Brown
: Neutral
: 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
POWER SUPPLY
POWER
CONSUMPTION
MICROWAVE
GRILL
CONVECTION
COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W X D X H)
CAVITY DIMENSIONS (W X D X H)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.
KOC-9Q0T7S
230V~50Hz, SINGLE PHASE WITH EARTHING
1400W
1250W
1250W
2700W
900W (IEC 705)
2450MHz
513X401X311mm(20.2X15.8X12.2 in.)
354X341X231mm(13.9X13.4X9.1 in.)
Approx. 16.6Kg (46.6 lbs.)
60 minutes
Microwave / Grill / Convection / Combination
10 LEVELS
0.99 Cu. Ft
3
3. EXTERNAL VIEW
1. OUTER DIMENSION
513 401
4
2. FEATURE DIAGRAM
2 3 4 5 6 7 8
1
9
13 12 11 10
1 1. DOOR HOOK
Hook automatically locks and holds the door when the door shuts. If the door opens while the oven is operating, the oven will stop operating immediately.
1 2. DOOR SEAL
Door seal prevents the microwave leakage from the oven cavity.
1 3. DOOR VIEWING SCREEN
Food, inside of oven, can be observed through the door viewing screen. It is designed that the microwave cannot pass through the screen.
1 4. TOP HEATER
Top heater turns on if any of heater related mode operates.
1 5. OVEN FRONT PLATE
1 6. CONVECTION INLET
1 7. OVEN LAMP
Oven lamp turns on anytime the door opens and oven operates.
1 8. SAFETY INTERLOCK SYSTEM
1 9. CONTROL PANEL
10. METAL RACK
11. COUPLER
Coupler located at the center of the oven cavity and it couples between the motor and the glass tray.
12. ROLLER GUIDE
Roller guide must be used anytime with the glass tray.
13. GLASS TRAY
Glass tray is made of special heat resistant glass material. It must be always properly fitted with the coupler and the roller guide.
5
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
• Check your local power source. This microwave oven requires a current of approximately 12 amperes, 230V, 50Hz.
• Power supply cord is about 1.0 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.
EARTHING INSTRUCTIONS
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.
WARNING
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 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.
6
6
7
8
9
0
3
4
5
5. CONTROL PANEL
1
2 q w e
1
Cooking time, power level, program indicators and present time are displayed.
MW ( ): When blinking, the oven is operating in MICROWAVE COOK mode.
Grill ( ): When blinking, the oven is operating in
GRILL mode.
Combi ( ): When blinking, the oven is operating in COMBI mode.
Convection ( ): When blinking, the oven is operating in CONVECTION mode.
Defrost ( ): When blinking, the oven is operating in DEFROST mode.
Auto-cook ( ): When blinking, the oven is operating in AUTO COOK mode.
Warm ( ): When blinking, the oven is operating in WARM mode.
Steam Cleaning ( ): When blinking, the oven is operating in STEAM CLEANING mode.
gram ( ): When blinking, the oven is operating in weight input mode.
2
Used to cook or reheat.
3
Used to set power level of the microwave.
4
Used to defrost foods.
5
Used to select grill mode.
6
Used to select combi mode.
7
Used to select convection mode and selected temp.
8
Used to set clock.
9
Used to clean the inside of the oven
0
Used to keep the food warm.
q
Used to set time, weight and quantity.
w
Used to start a program or a speedy start(each press adds
30 seconds of microwave cooking time).
e
Used to stop the oven operation or to delete the cooking data.
7
6. 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 makes 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 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, 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.
8
1. To remove cabinet
1) Remove five screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
1) Remove two screws which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for assembly.
NOTE: After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
9
✔
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).
3. To remove door parts.
A07 A06 A05 A01 A04
A03 A02
REF NO.
PART CODE
H36
A01
3511728300
3511714710
A02
A03
A04
A05
A06
A07
3513101900
3515101310
3512302410
3515204120
3517010400
3512209610
PART NAME
DOOR AS
DOOR SEAL AS
HOOK
SPRING HOOK
GASKET DOOR
STOPPER HINGE *T AS
BARRIER-SCREEN *O
FRAME DOOR
DESCRIPTION
KOC-9Q0T7S
KOC-9Q0T7S
POM
HSW-3
LUPOL 2300
KOR-6L0B1A
GLASS T3.2
ABS XR-401 SR-0320
(1) Remove the gasket door from door plate.
(2) Remove the door frame from door plate.
(3) Remove the stopper hinge top from door plate.
(4) Remove the spring and the hook.
(5) Remove barrier screen out from door frame.
(6) Reverse the above steps for reassembly.
Q’TY REMARK
1
1
1
1
1
1
1
1
10
4. Method to reduce the gap between the door seal and the oven front surface.
(1) To reduce gap located on part ‘A’.
• Loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface.
• Tighten two screws.
(2) To reduce gap located on part ‘B’.
• Loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface.
• Tighten two screws.
A
B
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm 2 .
11
✔
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).
5. To remove control panel parts.
B02 B01 B05 B03 B07
B04 B06 B09 B10 B08 B11
REF NO.
PART CODE
H34
B01
3516737100
3516733720
B02
B03
B04
B05
3511600910
3516912710
3516912660
3516912810
B06
B07
B08
B09
B10
B11
3511605160
3513406090
3514332600
3514332700
7121301011
7122401211
PART NAME
CONTROL-PANEL AS
CONTROL-PANEL
DECORATOR C-PANEL
BUTTON FUNCTION-A
BUTTON FUNCTION-B
BUTTON FUNCTION-C
DECORATOR RING
KNOB VOLUME
PCB MAIN AS
PCB SUB AS
SCREW TAPPING
SCREW TAPPING
DESCRIPTION
KOC-9Q0T7S
ABS SG-0760D SG-175
ABS H558 SMOG
ABS SG-0760D SG-175
ABS SG-0760D SG-175
ABS SG-0760D SG-175
ABS SG-0760D SG-175
ABS SG-0760D SG-175
KOC-9Q0T7S
KOC-9Q0T7S
T2S PAN 3X10 MFZN
T2S TRS 4X12 MFZN
(1) Remove screws securing the PCB MAIN AS.
(2) Pull out the PCB MAIN AS.
(3) Remove screws securing the PCB SUB AS.
(4) Pull out the KNOB VOLUME from the PCB SUB AS.
(5) Pull out the PCB SUB AS.
(6) Pull out the BUTTON FUNCTION A, B, and, C.
(7) Pull out the DECORATOR C-PANEL from the CONTROL-PANEL.
(8) Reverse the above steps for reassembly.
12
1
1
1
1
8
4
Q’TY REMARK
1
1
1
1
1
1
6. 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
7. To remove magnetron.
1) Remove three screws which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
CAUTION : 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/cm 2 for a fully assembled oven with door normally closed.
Metallic gasket plate
Magnetron antenna
Cooling fin
<MAGNETRON>
Filament terminal
13
8. To remove wind guide assembly.
1) Remove a screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove a screw which secure the wind guide assembly.
4) Draw forward the wind guide assembly.
5) Pull the fan from the motor shaft.
6) Remove two screws which secure the motor shaded pole.
7) Remove the motor shaded pole.
8) Reverse the above steps for reasembly.
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.
14
✔
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).
10. To remove fan convection assembly parts.
C04 C05 C01 C02
C06 C03
REF NO.
PART CODE
H08
C01
3511801400
3511414400
C02
C03
C04
C05
C06
3963511420
7S432X4081
3511801200
7400104011
7S627W40X1
PART NAME
FAN CONVECTION AS
COVER FAN CONVECTION
MOTOR SHADED POLE
SPECIAL SCREW
FAN CONVECTION
WASHER PLAIN
NUT HEX
DESCRIPTION
KOC-9Q0T7S
SBHG-2 T0.6
230V 50HZ MW10CA-T04
TT3 TRS 4X8 SE MFZN
SBHG T0.5
PW-1-4 MFZN
NUT FLANGE M4X0.7P MFZN
Q’TY REMARK
1
1
1
1
1
2
1
(1) Remove four screws from the inside of cavity.
(2) Remove NUT HEX at the center of the fan.
(3) Remove WASHER PLAIN.
(4) Remove two screws from the COVER FAN CONVECTION.
(5) Pull out the MOTOR SHADED POLE.
(6) Reverse the above steps for assembly.
15
✔
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).
11. To remove top heater assembly parts.
D02 D03 D04
D06 D05 D01
REF NO.
PART CODE
H44
D01
3512807530
3512805800
D02
D03
D04
D05
D06
3511414500
3512808200
7123400808
3510611300
7123400808
PART NAME
HEATER *T AS
HEATER MIRACLON
COVER HEATER *T
HEATER REFLECTOR
SCREW TAPPING
BRACKET COVER HEATER
SCREW TAPPING
DESCRIPTION
KOC-9Q0T7S
230V 800W 270MM
SA1D T0.5
STS430 T0.4
T2S BIN 4X8 STS
SBHG T0.5
T2S BIN 4X8 STS
(1) Remove a screw from the BRACKET COVER HEATER.
(2) Remove the BRACKET COVER HEATER from the COVER HEATER *T.
(3) Remove the HEATER MIRACLON.
(4) Remove two screws from the HEATER REFLECTOR.
(5) Remove the HEATER REFLECTOR from the COVER HEATER *T.
(6) Reverse the above steps for reassembly.
Q’TY REMARK
1
1
2
1
1
1
1
16
✔
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).
12. To remove guide air assembly parts.
REF NO.
PART CODE
H45
E01
3512525510
3512528410
E02
E03
E04
3512806700
3513004400
7123400808
PART NAME
GUIDE AIR AS
GUIDE AIR
HEATER *U
HOLDER HEATER
SCREW TAPPING
(1) Remove a screw from the GUIDE AIR.
(2) Remove the HOLDER HEATER from the GUIDE AIR.
(3) Remove the HEATER *U.
(4) Reverse the above steps for reassembly.
DESCRIPTION
KOC-9Q0T7S
SAID T0.5
230V 400W TC
STS 301 T0.5
T2S BIN 4X8 STS
Q’TY REMARK
1
1
1
1
1
17
7. INTERLOCK MECHANISM AND ADJUSTMENT
The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.
(1) Primary interlock switch
When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate.
When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch bring it under ON condition. (NO position)
(2) DOM switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The hook presses the button of the interlock monitor switch to bring it under OFF condition (NO position) and the lock lever presses the button of the DOM switch to bring it under ON condition. (NO position)
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be opened (NO position) before other switches are closed.
When the door is opened, the interlock monitor switch should be closed (NC position) after other switches are opened.
(3) Adjustment steps
a) Loosen the one mounting screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely two mounting screws.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm 2 , readjust interlock mechanism.
18
8. TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1) Check grounding before trouble checking.
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, disconnect one load wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
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.
(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.
CONDITION
Fuse blows.
CHECK
Check continuity of interlock monitor switch with door closed
( COM NC )
Check continuity of primary an interlock switch
with door closed
RESULT
Continuity
(COM NC)
No continuity
No
Continuity
Continuity
Continuity
CAUSE
Malfunction of
Interlock monitor switch
Malfunction of interlock switch
REMEDY
Replace
Replace
Replace
Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close
( COM NC close )
Check continuity of primary winding of low voltage transformer or infinite
Approx.
1040 ~1130
( normal )
Shorted contacts of primary interlock Switch
Defective low voltage transformer
Replace
Disconnect high voltage fuse and operate the unit
Fuse again blows
Defective high voltage transformer
Replace
19
CONDITION
Outlet has proper voltage fuse does not blow?
CHECK
Check continuity of magnetron
Check continuity of noise filter board
Check continuity of power supply cord
RESULT
No continuity
No continuity
No continuity
No continuity
CAUSE
Defective magnetron.
Defective line filter board
Open power supply cord
Defective touch control circuit
REMEDY
Replace
Replace
Replace
Replace
NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock mechanism and adjust) for adjustment instructions
(TROUBLE 2)
Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start button is tapped.
CONDITION
Turn table motor and oven lamp do not turn on
CHECK
Check continuity of primary interlock switch
Check continuity of
D.O.M switch
Check D.C voltage being supplied to
RELAY(RY2) coil
RESULT
No continuity
No continuity
0V
Approx.
12V DC
CAUSE
Malfunction of primary interlock switch
Malfunction of
D.O.M switch
Defective touch control Circuit
Fault contacts of RELAY
(RY2) or open relay coil.
REMEDY
Adjust or replace
Adjust or replace
Replace
Replace
20
TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
No microwave oscillation
CHECK
Check continuity of high voltage fuse
RESULT
No continuity
No microwave oscillation
CAUSE
Defective high voltage fuse
Continuity
Check continuity of high voltage capacitor terminals with wires removed
Check continuity of high voltage rectifier in forward and backward direction with DC megger
Connect megger leads to magnetron terminal and magnetron body
Check D.C voltage being supplied to
RELAY (RY1) coil
Continuity in backward direction
Continuity
0 V
Approx.
12V DC
Defective high voltage transformer
Defective high voltage rectifier
Defective magnetron
Defective touch control circuit
Faulty contacts of
RELAY
(RY1) or open relay coil
1
Check resistance of primary and secondary coil of high voltage transformer
1
Check continuity of filament terminal of high voltage transformer
2
Check continuity of magnetron heater with wires removed
0 or
No continuity
No continuity
Defective high voltage transformer
Defective high voltage transformer
Defective magnetron
REMEDY
Replace
1
Replace
2
Replace
Replace
Replace
Replace
Replace
21
(TROUBLE 4)
Top heater (main) is not heated; food will not become hot.
CONDITION
Main heater is not heated.
CHECK
Check continuity of primary interlock switch
RESULT
No continuity
Check continuity of
DOM switch
No continuity
No continuity
Check continuity of heater
Check D.C voltage being supplied to
RELAY (RY3) coil
0V
Approx.
12V DC
CAUSE
Malfunction of primary Interlock switch
Malfunction of
DOM switch
Defective heater
Defective touch control circuit
Faulty contacts of
RELAY
(RY3) or open relay coil
REMEDY
Adjust or replace
Adjust or replace
Replace
Replace
Replace
(TROUBLE 5)
1) Top heater (sub) is not heated; food will not become hot.
2) Convection fan motor does no rotate.
CONDITION
1)Sub heater is not heated.
2)Convection fan and motor does not rotate.
CHECK
Check continuity of primary interlock switch
RESULT
No continuity
No continuity
Check continuity of
DOM switch
Check continuity of
(heater or motor)
Check D.C voltage being supplied to
RELAY (RY4, RY2) coil
No continuity
0V
Approx.
12V DC
CAUSE
Malfunction of primary Interlock switch
Malfunction of
DOM switch
Defective heater or motor
Defective touch control circuit
Faulty contacts of
RELAY
(RY4,RY2) or open relay coil
REMEDY
Adjust or replace
Adjust or replace
Replace
Replace
Replace
22
(TROUBLE 6)
The following visual conditions inditions 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.
Check if the RELAY(RY2) contacts close and if they are close, replace touch control circuit.
CONDITION
Display does not show programming at all, even if keyboard is touched.
CHECK
Check each button for continuity of the button
RESULT
Normal
CAUSE
Malfunction of sub pcb assembly
REMEDY
Replace control box sub-assembly
(TROUBLE 7)
When ERROR 2 ERROR 3 come on display.
CONDITION
ERROR 2 &
ERROR 3 come on display
CHECK
Check continuity of thermistor
(resistance of thermistor)
0
RESULT or infinite
Approx
200~300k
(room temperature)
CAUSE
Replace
REMEDY
Replace
Check continuity of heater
(main, sub)
No continuty
Defective heater
Replace continuity
Defective touch control circuit
Replace
23
9. MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below.
PROCEDURE
1. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm.
The mass of the container is determined.
2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial temperature of 10˚C ± 1˚C is used for the test. The water temperature is measured immediately before it is poured into the container.
3. A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained.
The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position.
The oven is operated and the time for the water temperature to attain 20˚C ± 2˚C is measured. The oven is then switched off and the final water temperature is measured within 60s.
NOTE 1 - The water stirred is before its temperature is measured.
NOTE 2 - Stirring and measuring devices are to have a low heat capacity.
4. The microwave power output is calculated from the formula
P = 4,187 • T
2
- T
1
) + 0.55 • mc T
2
- T
0
)/t where
P is the microwave power output, in watts ; m w is the mass of the water, in grams ; m c is the mass of the container, in grams ;
T
0 is ambient temperature, in degrees Celsius ;
T
1 is the initial temperature of the water, in degree Celsius ;
T
2 is the final temperature of the water, in degrees Celsius ; t is the heating time, in seconds, excluding the magnetron filament heating-up time.
✻
The microwave power output is stated in watts, rounded off to the nearest 50W
CAUTION
1. Water load should be measured exactly to 1 liter.
2. Input power voltage should be exactly specified voltage (Refer to 2. SPECIFICATIONS).
3. Ambient temperature should be 20 ± 2°C (68 ± 3.6°F)
✻
Heating time for power output: (T
2
= T
0
)
A (second)
B (W)
70
600
64
650
60
700
56
750
52
800
49
850
47
900
44
950
42
1000
40
1050
38
1100
24
2. MICROWAVE RADIATION TEST
WARNING
1. Make sure to check the microwave leakage before and after repair of adjustment.
2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.
3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.
4. Care should be taken not to place the eyes in direct line with the source of microwave energy.
5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.
PROCEDURE
1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100°C (212°F).
2. Pour 275cc ± 15cc of tap water initially at 20 ± 5°C (68 ± 9°F) in the 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.).
3. Place it at the center of the tray and set it in a cavity.
4. Close the door and operate the oven.
5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz.
1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/Cm 2 .
2) When measuring the leakage, always use the 5 cm (2 in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents.
3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, move the probe more slowly.
4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result.
25
3. 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.
1. High voltage transformer
1) Remove connections from the transformer terminals and check continuity.
2) Normal readings should be as follows :
Secondary winding ... Approx. 168 Ω ±10%
Filament winding ... Approx. 0 Ω
Primary winding ... Approx. 1.97 Ω
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 10MW once the capacitor charged.
3) A shorted capacitor will show continuous continuity.
4) An open capacitor will show constant 10M Ω .
5) Resistance between each terminal and chassis should be infinite.
3. High voltage diode
1) Isolate the diode from the circuit by disconnecting the leads.
2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals.
Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diode's resistance will be infinite in one direction and several hundred k Ω in the other direction.
4. Magnetron
For complete magnetron diagnosis, refer to "Measurement of the Microwave Output Power." 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 0.1 Ω 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.
26
4. COMPONENT ACTION
COOKING MODE
MANUAL
MODE
AUTO
MODE
M/W
GRILL
COMBI
CONVECTION
ROAST PORK
ROAST BEEF
ROAST CHICKEN
BAKED FISH
FRESH VEGETABLES
DEFROST
STEAM CLEANING
WARM
●
●
●
●
●
●
●
MAGNE-
TRON
●
●
●
●
●
●
●
●
●
MAIN
HEATER
●
●
●
●
●
●
●
SUB
HEATER
●
●
CONVEC-
TION FAN
●
●
●
●
●
●
●
●
●
●
●
●
27
10. WIRING DIAGRAM
28
11. EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to 6. Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to 6. Disassembly and assembly.
3. TOTAL ASSEMBLY
29
✔
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).
H28
H29
H30
H31
H24
H25
H26
H27
H20
H21
H22
H23
H16
H17
H18
H19
H32
H33
H34
H35
H36
H37
H12
H13
H14
H15
H08
H09
H10
H11
H04
H05
H06
H07
NO
H01
H02
H03
4415A66910
3518907020
3513003410
7122401211
3510317520
3512101400
3518303100
3513003200
3518401300
7S432X4081
3518702100
3515201101
7272400811
7S312X40A1
3513601600
4414H50000
PARTS CODE
3516207440
3511403800
7123400808
3511414800
3517413410
3966031800
7122400611
3511801400
7123400808
3514801400
7S432X4081
3512783520
3513820520
3513702630
4415A17352
3518124400
3516003700
3516737100
7122401211
3511728300
3516003700
PARTS NAME
CAVITY AS
COVER WAVE GUIDE
SCREW TAPPING
COVER LAMP
COUPLER
MOTOR SYNCRO
SCREW TAPPING
PARTS DESCRIPTION
KOC-9Q0T7S
MICA T0.35
T2S BIN 4X8 SUS
PE 0.1T
TEFLON
49TYD-5C
T2S TRS 4X6 MFZN
FAN CONVECTION AS
SCREW TAPPING
KOC-9Q0T7S
T2S BIN 4X8 SUS
SENSOR TEMPERATURE PTM-K312-D7
SPECIAL SCREW TT3 TRS 4X8 SE MFZN
HARNESS MAIN
LOCK
LEVER LOCK
SW MICRO
KOC-9Q0T7S
PP
POM
VP-533A-OF SPNO #187 200G
SW MICRO
THERMOSTAT
HOLDER THERMOSTAT
SCREW TAPPING
BASE
FOOT
CAPACITOR HV
HOLDER HV CAPACITOR
DIODE HV
SPECIAL SCREW
FUSE HV
STOPPER HINGE *U
SCREW TAPTITE
SCREW SPECIAL
LAMP
FIXTURE AS
TRANS HV
SPECIAL SCREW
CONTROL-PANEL AS
SCREW TAPPING
DOOR AS
SPECIAL SCREW
VP-531A-OF/SZM-V16-FA-61
OFF:120 ON:60 H #187 NB
PP(BK)
T2S TRS 4X12 MFZN
SBHG T0.5
DASF-310
2100VAC 0.98UF #187 +3 -0
SECC T0.5
CL01-12
TT3 TRS 4X8 SE MFZN
5KV 0.7A T.H.V.060T
SCP-1 T2.5
TT3 TRS 4X8 MFZN
T1 TRS 4X10 SE MFZN
BL 240V 25W T25 C7A H187
KOG-36150S
R1S59E ES00
TT3 HEX 4X8 FLG MFZN
KOC-9Q0T7S
T2S TRS 4X12 MFZN
KOC-9Q0T7S
TT3 HEX 4X8 FLG MFZN
1
2
1
6
1
1
1
1
1
1
1
2
1
1
2
1
1
1
1
4
1
2
1
1
1
1
1
1
1
4
QUANTITY
1
1
1
1
1
1
1
30
✔
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).
H49
H50
H51
H52
H45
H46
H47
H48
H53
H54
H55
H56
H41
H42
H43
H44
NO
H38
H39
H40
PARTS CODE
3512529400
7122401211
35113A5QJ5
7S312X40A1
3518003700
7272400811
3512807530
3512525510
7112401011
7112400808
3513304400
3518903800
7121400611
7S312X40A1
3510810800
7S312X40A1
3517212000
3512512930
441CD35011
PARTS NAME
GUIDE WIND AS
SCREW TAPPING
CORD POWER AS
SCREW SPECIAL
MAGNETRON
SCREW TAPTITE
HEATER *T AS
GUIDE AIR AS
SCREW TAPPING
SCREW TAPPING
INSULATOR HEATER *T
THERMOSTAT
SCREW TAPPING
SCREW SPECIAL
CABINET AS
SCREW SPECIAL
TRAY RACK AS
GUIDE ROLLER AS
TRAY
PARTS DESCRIPTION
KOC-9Q0T7S
T2S TRS 4X12 MFZN
3X1.5 80X80 120-RTML 1.4M
T1 TRS 4X10 SE MFZN
2M218JFL 6CF
TT3 TRS 4X8 MFZN
KOC-9Q0T7S
KOC-9Q0T7S
T1 TRS 4*10 MFZN
T1 TRS 4X8 SUS
SBHG-2 T0.4
OFF:160 ON:115 V #187
T2S PAN 4X6 MFZN
T1 TRS 4X10 SE MFZN
KOC-9Q0T7S
T1 TRS 4X10 SE MFZN
KOC-9Q0T7S
KOR-121Q3A XAREC
GLASS DIA:325 1320G
2
1
1
1
1
1
1
2
QUANTITY
1
1
1
3
1
2
1
1
1
5
1
31
12. PRINTED CIRCUIT BOARD
CIRCUIT CHECK PROCEDURE
1. Low voltage transformer check
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 230V / Frequency: 50Hz
1
9
8
7
Terminal
7-8-9
3
Voltage(load)
DC 13.5 V
Voltage(no load)
AC 37 V
NOTE
1. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
2. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage Check
- Key check point
NO
1
2
CHECK POINT
IC1 PIN 2, 3, 4
IC1 PIN 10
5VDC±5%
5V
0V
REMARK
T T : 20 ms(50Hz)
3 IC1 PIN 2 OR 3
5V
0V
T
T : 250 ns(4MHz)
- Check method
NO
1
2
MEASURE POINT
MP1
MP2
WAVE FORM
DC 5V±5%
DC 12V±20%
REMEDY
Replace VL1,EC1,C4,C5
Replace D14,D15,EC2,R21,D12
REMARK
NO LOAD
NO LOAD
NOTE: Each measure point must be measured with GND points.
32
MP1
MP2
MEASUREPOINT
33
3. Case of no microwave oscillation
1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on.
*Cause: RELAY 1 does not operate.
B
A
RY1
(MAGNETRON)
23 P12
D7
Q11
R31
D10
R32
RY2
(LAMP,TRAY,FAN)
(CONV.FAN)
D11
V2
Q13
22 P13
R21
STATE
RELAY 1 ON
RELAY 1 OFF
POINT A
+5V DC
GND
POINT B
GND
12V DC
2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator in display comes on.
*Cause: RELAY 2 does not operate.
B
R31
A
R32
RY2
(LAMP,TRAY,FAN)
(CONV.FAN)
D11
V2
Q13
22 P13
R21
STATE
RELAY 2 ON
RELAY 2 OFF
- Check method
POINT A
+5V DC
GND
POINT B
GND
12V DC
3) When touching M/W button, oven lamp turns on and fan motor does not rotate but cook indicator in display comes on.
*Cause: RELAY 2 does not operate.
23 P12
RY2
(LAMP,TRAY,FAN)
(CONV.FAN)
D11
R21
B
R31
V2
D10
Q13
Q11
R32
A
22 P13
STATE
RELAY 2 ON
RELAY 2 OFF
- Check method
POINT A
+5V DC
GND
POINT B
GND
12V DC
34
4. Case of no heating of top heater main.
When touching GRILL or COMBI or CONVECTION button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on.
*Cause: RELAY 3 does not operate.
A
R16
B
24 P11
RY3
(GRILL)
D7
Q8
Q7
STATE
RELAY 3 ON
RELAY 3 OFF
POINT A
+5V DC
GND
POINT B
GND
12V DC
5. Case of no heating of top heater sub.
When touching GRILL or COMBI or CONVECTION button, oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on.
*Cause: RELAY 4 does not operate.
A
B
RY4
(CONV. HEATER)
R20
25 P10
D9
Q10
Q9
STATE
RELAY 4 ON
RELAY 4 OFF
POINT A
+5V DC
GND
POINT B
GND
12V DC
35
6. Case of no stopping of the count down timer
When the door is opened during operation, the count down timer does not stop.
CN1
YW396-02V
1
2
D.O.M SW
A
V2
R9 4.7K
V1
D6
1N4148
R10
47K
Q6 A1266Y
R11
10K
V1
B
C1
104Z
28 P32
- Check method
POINT
STATE
DOOR OPEN
DOOR CLOSED
CHECK NO
1
A
OPEN
CLOSE
B
+5V DC
GND
METHOD REMEDY
Check the stage(ON,OFF) of the door open Replace door open monitor swith.
monitor switch by resistance measurement.
36
13. P.C.B. CIRCUIT DIAGRAM
37
PCB ASS’Y PART LIST
NO
1 BZ1
2 CA1
LOCATION
3 C7
4 C4,C6
5 C1~3,C5,C8,C9
6 EC1
7 EC2
8 CN1
9 CN2
10 CN3
11 CN5
12 D1~D13
13 D14,D15
14 IC1
15 IC2
16 VL1
17 DP1
18 M291
19 RA1
20 R1~R8
PART CODE NAME
3515600100 BUZZER
CN5XB-102M C ARRAY
CCZF1H473Z C CERA
CCZB1H102K C CERA
CCZF1H104Z C CERA
CEXE1H100A C ELECTRO
CEXF1E102V C ELECTRO
3519150520 CONN WAFER
4CW215SBD0 CONN FILM
30166M5030 CONN WAFER
3519150540 CONN WAFER
DZN4148--DIODE SWITCHING
DZN4004A-DIODE RECTIFIER
13GL86FH47 IC MICOM
1K1A7033AP IC RESET
1CPMC7805C IC REGULATOR
DDDUA9Q0TLED DISPLAY
3514332400 PCB MAIN
RA-87X104J R ARRAY
RD-AZ331JR CARBON FILM
21 R12,18,25,26,33
22 R9,16,20,32
RD-AZ102J-
RD-AZ472J-
R CARBON FILM
R CARBON FILM
23 R11,19,R22~24,R27~29 RD-AZ103JR CARBON FILM
24 R10,30
25 R17
26 R21
RD-AZ473J-
RD-AZ105J-
RD-4Z510J-
R CARBON FILM
R CARBON FILM
R CARBON FILM
27 R31
28 R14
29 R15
30 CR1
RD-4Z101JR CARBON FILM
RN-AZ1002F R METAL FILM
RN-AZ1203F R METAL FILM
5P4R00MTSRESONATOR CERA
31 RY1,3
32 RY2,4
33 Q1~Q5
34 Q7,9,11,12,14
35 Q6
36 Q8.10,13
5SC0101121 SW RELAY
5SC0101487 SW RELAY
TZRA106M-TR
TZRC106M-TR
TZTA1266YTR
TZTC3198GR TR
37 LVT1
38 J4,5,8~10,15,21~24,
5EPV035308 TRANS POWER
85801052GY WIRE COPPER
J29~31,33,34
39 J1~3,6,7,11~14,16~20, 85801052GY WIRE COPPER
J28,J32,35~37
40 M292
41 CN101
42
43
EN101
SW101~SW111
44 J101,J102
45 WF1
3514332500
4CW215RBD0
5S10302010 SW ROTARY
5S50101Z93 SW TACT
85801052GY
WSJ-159007
PCB SUB
CONN WAFER
WIRE COPPER
WIRE FLAT
SPECIFICATION
BM-20K
6P(5) 1000PF M 50V
50V HIKF 0.047uF Z
102K 50V AXIAL
50V HIKF 0.1uF Z
50V RSS 10MF
25V RSS 1000uF
YW396-02V
HLEM15S-1
MOLEX 35312-0310
YW396-07AV
1N4148 AUTO 52mm
1N4004A AUTO 52mm
TMP86FH47AUG(TMP86CH47AUG)
KIA7033AP
MC7805C
TOF-4422BMA-B14-G
BOARD(92.8x197)
7P(6) 1/8 100K J
1/6 330 OHM 5%
1/6 1K OHM 5%
1/6 4.7K OHM 5%
1/6 10K OHM 5%
1/6 47K OHM 5%
1/6 1M OHM 5%
1/4 51 OHM 5% SMALL
1/4 100 OHM 5% SMALL
1/6 10K 1%
1/6 120K 1%
CRT4.00MS
G5G-1A 1C 1P DC12V
DY2-DC12
KRA-106M (AUTO)
KRC-106M (AUTO)
KTA-1266Y (AUTO) (1015Y)
KTC-3198GR (AUTO) (1015Y)
DMR-161FS
1/0.52 TIN COATING 7.5mm
2
1
1
5
4
8
1
1
1
1
5
1
3
2
2
5
1
15
1
1
1
1
13
2
1
8
1
1
Q'TY
1
1
1
2
6
1
1
1
1
1
1/0.52 TIN COATING 10mm
BOARD(85.4x197)
HLEM15R-1
RE012305PVB25FINB1-2-24PCE
KPT-1115AM
1/0.52 TIN COATING 10mm
1.25X15X90XC
19
1
1
1
11
2
1
38
S/M NO. :
DAEWOO ELECTRONICS CORP.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
PRINTED DATE: Aug. 2008
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XYb,!X6b,!XLb,!XSb!QWm!TLb
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