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S/M No. :
G131A9A11001
Service Manual
Microwave Oven
Model: KOG-131A9A11
✔
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).
DAEWOO ELECTRONICS CO RP.
http : //svc.dwe.co.kr
Nov. 2002
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.
(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.
TABLE OF CONTENTS
SAFETY AND PRECAUTIONS........................................................................................................................................3
FOR SAFE OPERATION ...........................................................................................................................................3
FOR SAFE SERVICE PROCEDURES .....................................................................................................................3
SPECIFICATIONS ............................................................................................................................................................4
EXTERNAL VIEW .............................................................................................................................................................5
OUTER DIMENSION .................................................................................................................................................5
FEATURE DIAGRAM.................................................................................................................................................6
CONTROL PANEL .....................................................................................................................................................7
INSTALLATION ................................................................................................................................................................8
OPERATIONS AND FUNCTIONS ...................................................................................................................................9
DISASSEMBLY AND ASSMBLY...................................................................................................................................10
INTERLOCK MECHANISM AND ADJUSTMENT.........................................................................................................18
TROUBLE SHOOTING GUIDE ......................................................................................................................................19
MESUREMENT AND TEST............................................................................................................................................23
MEASUREMENT OF THE MICROWAVE POWER OUTPUT................................................................................23
MICROWAVE RADIATION TEST ...........................................................................................................................24
COMPONENT TEST PROCEDURE .......................................................................................................................25
WIRING DIAGRAM.........................................................................................................................................................26
PRINTED CIRCUIT BOARD...........................................................................................................................................27
CIRCUIT CHECK PROCEDURE.............................................................................................................................27
P.C.B. CIRCUIT DIAGRAM .....................................................................................................................................30
P.C.B. LOCATION NO. ............................................................................................................................................31
EXPLODED VIEW AND PARTS LIST ...........................................................................................................................32
DOOR ASSEMBLY ..................................................................................................................................................32
CONTROL PANEL ASSEMBLY ..............................................................................................................................32
TOTAL ASSEMBLY .................................................................................................................................................32
2
SAFETY AND PRECAUTIONS
CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service
Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.
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 and CDRH immediately.
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE
FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY
USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDES
FLANGES AND GASKETS MUST BE SECURED. NEVER OPERATE THE DEVICE WITHOUT A
MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE
OR ANTENNA WHILE THE DEVICE IS ENERGIZED.
3
SPECIFICATIONS
MODEL
POWER SUPPLY
POWER
CONSUMPTION
KOG-131A9A11
120V~60H
Z
, SINGLE PHASE WITH EARTHING
MICROWAVE 1350W
GRILL 1150W
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W X H X D)
CAVITY DIMENSIONS (W X H X D)
1000W
2450MHz
563X318X418mm (22.1X12.5X16.5 in.)
380X246X386mm (14.9X9.7X15.2 in.)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
* Specifications are subject to change without notice.
APPROX. 17.5kg (38.6 lbs)
99min. 99sec.
MICROWAVE, GRILL
10 LEVELS
1.3 Cu. Ft
4
EXTERNAL VIEW
1. OUTER DIMENSION
563 418
5
2. FEATURE DIAGRAM
1 w e 5 6
7
0
2 3
8 q
9 4 r
1. DOOR SEAL
Door seal maintains the microwave within the oven cavity and prevents microwave leakage.
2. DOOR HOOK
When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.
3. DOOR SCREEN
Allows viewing of food. Microwave cannot pass through perforations in screen.
4. SPATTER SHIELD
Protects the microwave outlet from splashes of cooking foods.
5. OVEN LAMP
Automatically turns on during oven operating.
6. SAFETY INTERLOCK SYSTEM
7. CONTROL PANEL
8. GLASS COOKING TRAY
Made of special heat resisant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.
9. OVEN FRONT PLATE
10. DOOR OPENING BUTTON
To open the door, push the door opening button. When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.
11. ROLLER GUIDE
Supports the glass cooking tray.
12. REFLECTOR (INSULATOR HEATER)
13. HEATING ELEMENT
14. METAL RACK
6
3. CONTROL PANEL
2 r
8
6
7
1
0 w
M/W Defrost Grill Timer/lb
1. Bread
2. Soup
3. Baked Potato
4. Fresh Vegetable
5. Frozen Vegetable
M/W Grill
Dish
Warmer
Beverage
LESS
Fish
MORE
Auto Defrost
Poultry
Auto
Cook
Defrost
Pasta
Frozen
Pizza
Meat
1 2 3
4 5 6
7 8 9
Kitchen
Timer
0
Clock
Stop/Clear Start/Speedy cook
4
9
3
5 q e
1. Time set pad - Used to set the cooking time and the present time.
2. Display - Cooking time, power level, indicators and present time are displayed.
3. One touch - Used to cook or reheat specific quantities of food.
4. Auto cook - Used to cook or reheat.
5. More - Used to increase time to cooking.
6. Less - Used to decrease time from cooking.
7. Auto Defrost - Used to defrost foods.(for weight)
8. M/W - Used to set power level.
9. Defrost - Used to defrost foods.(for time)
10. Kitchen Timer - Used as a minute timer, delay cooking, hold setting after cooking.
11. Clock - Used to set clock.
12. Stop/Clear - Used to stop the oven operation or to delete the cooking data.
13. Start/Speedy cook - Used to start the oven and also used to set a reheat time.
14. Grill - Used to cook grill.
7
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 oven 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.
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, 120 Volts, 60 Hz grounded outlet.
Power supply cord is about 0.8 meters long.
1) A short power-supply cord is provided to reduce the risks resulting from becoming entangled in or tripping over a longer cord.
2) Longer cord sets or extension cords are available and may be used if care is exercised in their use.
3) If a long cord or extension cord is used:
1 The marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of the appliance.
2 The extension cord must be a grounding type 3-wire cord.
3 The longer cord should be arranged so that it will not drape over the counter top or tabletop where it can be pulled on by children or tripped over unintentionally.
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.
8
OPERATIONS AND FUNCTIONS
1. Connect the main lead to an electrical outlet.
2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking.
3. Close the door securely.
4. When the oven door is opened, the light turns on.
5. The oven door can be opened at any time during operation by touching the door release button on the control panel.
The oven will automatically shut off. To restart the oven, close the door and then touch START.
6. Each time a pad is touched, a BEEP will sound to acknowledge the touch.
7. The oven automatically cook on full power unless set to a lower power level.
8. The display will show : 0 when the oven is plugged in.
9. Time clock returns to the present time when the cooking time ends.
10. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained.
To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.
11. If the START pad is touched and the oven does not operate, check area between the door and door is closed securely. The oven will not start cooking under the door is completely closed or the program has been reset.
12. When using the GRILL mode ;
• Do not open the door so often, the temperature inside the oven decrease and the cooking may not be completed in setting time.
• Never touch the oven window and metal interior of the oven when taking food in and out, because the temperature inside the oven and door is very high.
• When using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while handing tray.
Make sure the oven is properly installed and plugged into the electrical outlet.
Wattage output chart
The power level is set by pressing the M/W pad. The chart shows the display, the power level and the percentage of power.
Touch M/W pad.
Once
Twice
3 times
4 times
5 times
6 times
7 times
8 times
9 times
10 times
11 times
Power level(Display)
P-HI
P-90
P-80
P-70
P-60
P-50
P-40
P-30
P-20
P-10
P-00
Approximate Percentage of Power
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
9
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 20A fuse is blown 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.
10
1. To remove cabinet
1) Remove three 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 reassembly.
NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
11
✔ Caution:
In this Service 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.
REF NO.
A01
A02
A03
A04
A05
A06
A07
A08
PART CODE
3512204500
3517006500
3515202900
3511713600
3517006400
3512302200
3513101400
3515101900
PART NAME
FRAME DOOR
BARRIER SCREEN *O
STOPPER HINGE *T AS
DOOR PAINTING AS
BARRIER SCREEN *I
GASKET DOOR
HOOK
SPRING HOOK
(1) Remove the gasket door from door plate.
(2) Remove the barrier screen inner from door plate.
(3) Remove the door frame from door plate.
(4) Remove the stopper hinge top from door plate.
(5) Remove the spring and the hook.
(6) Remove the barrier screen outer from door frame.
(7) Reverse the above steps for reassembly.
DESCRIPTION
ABS XR-401, SR-0320M
PEPT T0.25
KOR-121M0A
KOR-131G0A
PE T0.1
PP
POM
PW-1
Q’TY
1
1
1
1
1
1
1
1
12
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 .
13
✔ Caution:
In this Service 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.
REF NO.
B01
B02
B03
B04
B05
B06
B07
PART CODE
3518523210
3516723910
3514324340
7122401211
3513702800
441G430171
3516908110
PCB AS
PART NAME
SWITCH MEMBRANE
CONTROL PANEL
SCREW TAPPING
LEVER DOOR OPEN
SPRING BUTTON
BUTTON DOOR OPEN
DESCRIPTION
KOG-131A9A11
ABS AF-345, VE-345, VE-0855
KOG-131A9A11
T2S TRS 4*12 MFZN
PP
SWP DIA 0.7
ABS AF-345, VE-0855
(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
(2) Remove the door open lever from the control panel.
(3) Remove three screws which secure the PCB assembly to control panel.
(4) Disconnect membrane tail from the connector of the PCB assembly.
(5) Detach membrane from the control panel.
(6) Remove door open button and button spring from the control panel.
(7) Reverse the above steps for reassembly.
Q’TY
1
1
1
1
1
3
1
14
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.
7. High voltage circuit wiring
8. 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/cm 2 for a fully assembled oven with door normally closed.
Metallic gasket plate
Magnetron antenna
Cooling fin
Filament terminal
15
9. To remove wind guide assembly.
1) Remove a screw which secure the wind guide assembly.
2) Draw forward the wind guide assembly.
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.
10. 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.
16
✔ Caution:
In this Service 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 insulator Heater assembly.
1) Remove the HEX NUT (F09).
2) Remove the two HEX NUTS (F43).
3) Remove the insulator Heater assembly (C00).
4) Reverse the above steps for reassembly.
REF NO.
C01
C02
C03
C04
C05
C06
PART NAME
INSULATOR HEATER
HEATER
SCREW MACHINE
NUT HEX
SCREW MACHINE
SPACER INSULATOR *I
1) Remove the HEX NUTS (C04).
2) Remove the insulater Heater (C01) and Heater (C02).
3) Remove the two screws (C05).
4) Reverse the above steps for reassembly.
PART CODE
3513302200
3512802800
7002500613
7392500008
7002400413
3515000600
DESCRIPTION
SPP T0.8
120V 1100W
TRS 5X6 MFCR
6N-2-5 SUS
TRS 4X4 MFCR
C3771BD
17
Q’TY
1
1
1
1
2
2
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.
DOOR LATCH
BK
WH
LOCK LEVER
BK
RD
BK
PRIMARY
INTERLOCK SWITCH
WH
GY
INTERLOCK MONITOR
SWITCH
FRONT-PLATE
LAMP SWITCH
BK/RD
WH/WH
RD BL
SECONDARY
INTERLOCK SWITCH
GN
WH : WHITE
RD : RED
GN : GREEN
BK : BLACK
GY : GRAY
BL : BLUE
Condition : DOOR CLOSE
BUTTON
MOUNTING SCREW
Condition : DOOR OPEN
(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 micro switch. Then the button of the primary interlock switch bring it under NO condition.
(2) Secondary interlock switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under NO condition. The lock lever presses the button of the secondary interlock switch to bring it under NO condition.
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.
When the door is opened, the interlock monitor switch should be changed (NC condition) 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
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
Replace fuse
Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close
Check continuity of primary winding of low voltage transformer
Disconnect one side of the lead wire connected form high voltage transformer to the high voltage capacitor and operate the unit
RESULT
Continuity
No Continuity
Continuity
0
Ω or infinite
Approx.
150~310
(normal)
Normal
Fuse again blows
CAUSE
Malfunction of interlock monitor switch
Shorted contacts of primary interlock switch.
Defective low voltage transformer
Defective high voltage capacitor
Defective high voltage transformer
REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace
Replace
19
CONDITION
Outlet has proper voltage Fuse does not blow.
CHECK
Check continuity of magnetron
Check continuity of power supply cord
Display do not shown countdown
RESULT
No
Continuity
No
Continuity
Normal
CAUSE
Defective magnetron
Open power supply cord
Defective touch control circuit
Malfunction of
D.O.M Switch
REMEDY
Replace
Replace
Replace
Replace
NOTE
All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”.
(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped.
CONDITION
Turntable motor and oven lamp do not turn on
CHECK
Check continuity of primary interlock switch
Check continuity of secondary interlock switch
Check D.C. voltage being supplied to RELAY (RY2) coil
RESULT
No
Continuity
No
Continuity
0 V
Approx.
15 VDC
CAUSE
Malfunction of primary interlock switch
Malfunction of secondary interlock switch
Defective touch control circuit
Faulty 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 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 resistance of primary and secondary coil of high voltage transformer
Check continuity of magnetron with wires removed
Check continuity of filament terminal of high voltage transformer
RESULT
Continuity
Continuity in backward direction
Continuity
0
Ω or
No
Continuity
No
∞
Continuity
0 V
Check D.C. voltage being supplied to RELAY (RY1) coil
Approx
15 VDC
CAUSE
Defective high voltage transformer
Defective high voltage rectifier
Defective magnetron
Defective high voltage transformer
Defective magnetron
Defective high voltage transformer
Defective touch control circuit
Faulty contacts of
RELAY (RY1) or open relay coil
REMEDY
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
21
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly
1. Incomplete segments,
1) Segments missing.
2) Partical segments missing.
3) Digit flickering other than normal display slight flickering.
4) " :0" does not display when power is on.
2. A distinct change in the display are not on when they should be.
3. One or more digits in the display are not on when they should be.
M/W Defrost Grill Timer/lb
4. Display indicates a number different from one touched.
5. Specific numbers (for example 2 or 3) will not display when the panel is touched.
6. Display does not count down or up with time cooking or clock operation.
7. Oven is programmable and cooks normally but no display shows.
8. Display obviously jumps in time while counting down.
9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when clear pad is touched.
11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close. If they are close, replace touch control circuit.
CONDITION
Display does not show programming at all, even if keyboard is touched.
CHECK
Check each pad for continuity of the membrane keyboard for the following keyboard check procedure
RESULT
Normal
Abnormal
CAUSE
Malfunction of touch control circuit of control box sub-assembly
Malfunction of the membrane keyboard
REMEDY
Replace control box sub-assembly
Replace the membrane keyboard
NOTE
Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's, failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B.
assembly.
22
MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly mmeasuring the temperature rise of a certain amount of water exposed to the microwave as directed below.
PROCEDURE
1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ± 5cc of potable water.
2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.
3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10 ± 2°C (50 ± 3.6°F). If is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position.
4. Microwave power is switched on.
5. Heating time should be exactly A seconds.
(Refer to table as following)
Heating time is measured while the microwave generator is operating at full power. The filament heatup time for magnetron is not included.
6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5K.
7. The microwave power output P in watts is calculated from the following formula:
P = 4187 X
∆
T t
•
∆
T is difference between initial and ending temperature.
• t is the heating time.
The power measured be B (Refer to SPECIFICATIONS) W ± 10.0 %.
CAUTION
1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS).
3. Ambient temperature should be 20 ± 2°C (68 ± 3.6°F)
✻ Heating time for power output:
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
23
2. MICROWAVE RADIATION TEST
CAUTION
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.
24
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. 110
Ω
±10%
Filament winding ... Approx. 0
Ω
Primary winding ... Approx. 1
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 10M
Ω 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 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 0.1
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.
25
WIRING DIAGRAM
26
PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low voltage transformer check
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 120V / Frequency: 60Hz
Terminal Voltage
4-7
LOAD
AC 12.6 V
NO LOAD
AC 14.7 V
NOTE
1. Refer to Ciruit Diagram (point 4).
2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
3. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage Check
- Key check point
NO CHECK POINT
1
2
IC1 PIN 2, 21, 30, 34
IC1 PIN 35
-5VDC
REMARK
T : 16.67ms(60Hz)
3 IC1 PIN 31 OR 32
T : 250 ns(4MHz)
- Check method
NO
1
2
MEASURE POINT
MP1
MP2
WAVE FORM
DC -5V±0.25V
DC -12V±2.0V
REMEDY
Replace VL1, EC1
Replace EC2, D12,13,14
REMARK
NO LOAD
NO LOAD
NOTE
Each measure point must be measured with GND points.
27
MP1
MP2
Mesure point
28
3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
✻ Cause : RELAY 2 does not operate. → refer to Circuit Diagram (point 3)
- Check method
POINT
STATE
A
RELAY 2 ON
RELAY 2 OFF
-5VDC
GND
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
✻ Cause : RELAY 1 does not operate. → refer to Circuit Diagram (point 2)
- Check method
POINT
STATE
A
RELAY 1 ON
RELAY 1 OFF
-5VDC
GND
4. When there is no grill oscillation.
✻ Cause : RELAY 3 does not operate. → refer to Circuit Diagram (point 6)
- Check method
POINT
STATE
A
RELAY 3 ON
RELAY 3 OFF
-5VDC
GND
5. When the door is opened during operation, the count down timer does not stop.
→ refer to Circuit Diagram (point 1)
- Check method
POINT
STATE
A
1) DOOR OPEN
2) DOOR CLOSED
OPEN
CLOSE
REMEDY
Replace door open monitor switch.
CHECK NO
1
METHOD
Check the stage(ON, OFF) of the door open monitor switch by resistance measurement.
6. When the digital clock does not operate properly.
→ refer to Circuit Diagram (point 5)
POINT WAVE FORM
B
GND
-12VDC
B
GND
-12VDC
B
GND
-12VDC
B
-5VDC
GND
A
T: 16.67 ms(60Hz)
❈ If clock does not keep exact time, you must check resistor R15,16, zener diode ZD1.
29
2. P.C.B. CIRCUIT DIAGRAM
30
✔ Caution:
In this Service 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. P.C.B. LOCATION NO
(1) KOG-131A0A
NAME
BUZZER
C ARRAY
CAPACITOR ELEC
CPAPCITOR ELEC
CONNECTOR WAFER
CONNECTOR WAFFR
CONNECTOR WAFER
DIODE RECTIFY
DIODE RECTIFY
DIODE ZENER
DIODE ZENER
LED DISPLAY
PCB MAIN
R ARRAY
RESISTOR
RESISTOR
RESISTOR
RESISTOR
RESISTOR
RESISTOR
RESISTOR
RESISTOR
REGULATOR
TRANSISTOR
TRANSISTOR
TRANS POWER
WIRE COPPER
WIRE COPPER
IC MICOM
RESONATOR CERA
SW RELAY
SW RELAY
CAPACITOR CERA
CAPACITOR CERA
27
28
29
30
23
24
25
26
31
32
33
34
19
20
21
22
15
16
17
18
11
12
13
14
9
10
7
8
5
6
3
4
NO
1
2
BZ1
SYMBOL
CA1
EC1
EC2
CN1
CN2
CN3
D1~6, 8~12, 15
D13, 14
ZD1
ZD2
DP1
M158
RA1
SPECIFICATION
BM-20K
7P(6) 102 M 50V
50V RS 1µF
25V RSS 1000µF
YW396-02AV
YW396-05AV
FCZ254-11
1N4148
1N4004A
UZ-5.1BSB 1/2W
UZ-3.3BSB 1/2W
DDG-631H
81.5X139.9
7P(6) 1/8 100K J
R1~R7 1/6W 220 5%
R8, 10, 12, 14, 22 1/6W 1K 5%
R11, 20, 21
R13
1/6W 100K 5%
1/6W 100 5%
R15~17
R18
R19
R23
1/6W 10K 5%
1/6W 1M 5%
1/4W 51 5%
1/6W 4.7K 5%
VL1
Q1~5, 8~11
Q6
LVT1
J1~3,5~8,10~12,17~21
SJ1, 3, 5
IC1
CR1
MC7905C
KRA-106M
KTA-1266
DMR-631P
1/0.52 TIN COATING
1/0.52 TIN COATING
TMP47C440BN-NF94
KBR-4.0MSTF
RY1, RY3
RY2
C6
C1, C3~C5, C7
G5G-1A DC 12V
OJ-SS-112LM
102 50V Z AXIAL
104 50V Z AXIAL
RD-AZ221J-
RD-AZ102J-
RD-AZ104J-
RD-AZ101J-
RD-AZ103J-
RD-AZ105J-
RD-4Z510J-
RD-AZ472J-
1MC7905C--
TZRA106M--
TZTA1266Y-
5EPU035302
85801052GY
85801052GY
13GS371GH0
5PKBR40MKS
5SC0101121
5SC0101404
CCZB1H102K
CCZF1H104Z
PART CODE Q’TY
3515600100 1
CN6XB-102M 1
CEXE1H109A
CEXF1E102V
3519150520
3519150510
1
1
1
1
441M367160
DZN4148---
DZN4004A--
DZUZ5R1BSB
DZUZ3R3BSB
DDDG631H--
3514315410
RA-87X104J
1
1
1
1
2
1
1
12
1
1
15
3
1
1
1
9
1
5
2
1
1
1
3
1
3
1
7
5
31
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly
3. TOTAL ASSEMBLY
32
✔ Caution:
In this Service 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)
F25
F26
F27
F28
F29
F30
F18
F19
F20
F21
F22
F23
F24
F31
F32
F33
F11
F12
F13
F14
F15
F16
F17
F05
F06
F07
F08
F09
F10
REF NO PART CODE
A00
B00
C00
F01
F02
F03
F04
3511713500
3516726150
3513302410
3510806600
3516004100
3516112900
7122401211
PART NAME
DOOR AS
CONTROL PANEL AS
INSULATOR HEATER AS
CABINET AS
SPECIAL SCREW
CAVITY AS
SCREW TAPPING
7122401211
7112401011
SCREW TAPPING
SCREW TAPPING
35113TCN35 CORD POWER AS
7122401211 SCREW TAPPING
7S627W50X1 NUT HEX
7121403011 SCREW TAPPING
3963822200
3512520000
3511800100
3518003200
3516003800
7272400811
3513003200
MOTOR SHADED POLE
GUIDE WIND
FAN
MAGNETRON
SPECIAL SCREW
SCREW TAPTITE
HOLDER HV CAPACITOR
3518302200
3518400400
3518116701
3516003700
3510313400
7112401011
3512100900
7272400811
3515202800
3512718510
4415A17352
4415A66600
4415A66910
3518571000
3513702600
3513814300
CAPACITOR HV
DIODE HV
TRANS HV
SPECIAL SCREW
BASE
SCREW TAPPING
FOOT
SREW TAPTITE
STOPPER HINGE *U AS
HARNESS MAIN
SW MICRO
SW MICRO
SW MICRO
SWITCH PUSH
LEVER LOCK
LOCK
DESCRIPTION
KOR-131G0A
KOG-131A9A11
KOG-211M0A
SECC T0.6
T1 TRS LR4 POLE 4X10 SE MFZN
KOG-131A0S
T2S TRS 4*12 MFZN
T2S TRS 4*12 MFZN
T1 TRS 4*10 MFZN
3X16AWG 40X40 120-RTM
T2S TRS 4*12 MFZN
NUT FLANGE M5X0.8P MFZN
T2S PAN 4*30 MFZN
120V 30W OEM-15DWX1-B07
PP
PP GF20
2M218H(F)P
T2 FLANGE 5X8 MFZN
TT3 TRS 4*8 MFZN
SECC T0.6
2100VAC 0.980
U
F #187
HVR-1X-3AB 12KV #187
DW-N95A0-13T
TT3 HEX 4X8 FLG MFZN
SBHG T0.7
T1 TRS 4X10 MFZN
PP DASF-130
TT3 TRS 4X8 NFZN
KOR-121M0A
KOG-131A0A
VP-533A-0F SPNO #187 200g
VP-532A-OF SPNC #187 200G
VP-531A-OF/SZM-V16-FA-61
MP101C
POM
POM 1
1
1
1
5
2
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
Q'TY
3
1
1
1
1
1
1
33
✔ Caution:
In this Service 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)
F41
F42
F43
F44
F45
F46
F47
F48
F49
REF NO PART CODE
F34
F35
F36
F37
F38
F39
F40
3513601500
7121400611
3966820200
3518905300
3513003410
7272400811
3511405100
4078502031
3517400620
7392500008
3514701501
3512519300
441CD35011
3517202611
3518906200
3513003400
PART NAME
LAMP
SCREW TAPPING
MOTOR SYNCRO
THERMOSTAT
HOLDER THERMOSTAT
SPECIAL TAPTITE
COVER WAVE GUIDE
BUTTON LOCKING
COUPLER
NUT HEX
ROLLER
GUIDE ROLLER
TRAY
TRAY RACK AS
THERMOSTAT
HOLDER THERMOSTAT
DESCRIPTION
BL 125V 25W T25 C5A H187
T2S PAN 4X6 MFZN
120V 2W GM-16-12F17
OFF:75 ON:65 H#187 NB
PP
TT3 TRS 4X8 MFZN
MICA T0.35
PP
XAREC
6N-2-5 SUS
TEFLON D:14.5
PP 5113 MF6 A353R
GLASS DIA:325 1320G
KOC-961COS 117mm
OFF:70 ON:60 H #187 NB
PP
2
3
2
1
1
1
1
1
1
Q'TY
1
2
1
1
1
1
1
34
S/M NO. : G131A9A11001
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: Nov, 2002
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