Daewoo KOR-6Q2B5S Service manual
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Daewoo KOR-6Q2B5S is a microwave oven with a range of features to make cooking easier. It has a 0.7 cubic foot capacity and a microwave power output of 800 watts, making it suitable for a variety of cooking tasks. The oven also has a grill function and a combination microwave and grill function, giving you even more cooking options.
The Daewoo KOR-6Q2B5S is easy to use, with a simple control panel that includes a digital display, a timer, and a number of preset cooking programs. The oven also has a child lock to prevent accidental use.
Here are some of the things you can do with the Daewoo KOR-6Q2B5S:
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S/M No. : R6Q2B5S001
Service Manual
Microwave Oven
Model: KOR-6Q2B5S
✔
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 CORP.
http : //svc.dwe.co.kr
Jul. 2004
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 as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5)
Evidence of dropping or abuse.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the federal performance standard should be performed on each oven prior to release to the owner.
TABLE OF CONTENTS
SAFETY AND PRECAUTIONS ...........................................................................................................................................2
1. FOR SAFE OPERATION ..................................................................................................................................2
2. FOR SAFE SERVICE PROCEDURES .............................................................................................................2
SPECIFICATIONS ...............................................................................................................................................................3
EXTERNAL VIEW................................................................................................................................................................4
1. OUTER DIMENSION.........................................................................................................................................4
2. FEATURE DIAGRAM ........................................................................................................................................5
3. CONTROL PANEL ............................................................................................................................................6
INSTALLATION ...................................................................................................................................................................7
OPERATIONS AND FUNCTIONS.......................................................................................................................................8
DISASSEMBLY AND ASSEMBLY......................................................................................................................................9
INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................16
TROUBLE SHOOTING GUIDE .........................................................................................................................................17
MEASUREMENT AND TEST ............................................................................................................................................21
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................21
2. MICROWAVE RADIATION TEST ...................................................................................................................22
3. COMPONENT TEST PROCEDURE ...............................................................................................................23
WIRING DIAGRAM............................................................................................................................................................24
PRINTED CIRCUIT BOARD..............................................................................................................................................25
1. CIRCUIT CHECK PROCEDURE ....................................................................................................................25
2. PCB CIRCUIT DIAGRAM................................................................................................................................28
3. P.C.B. LOCATION NO ....................................................................................................................................29
EXPLODED VIEW AND PARTS LIST...............................................................................................................................30
1. DOOR ASSEMBLY .........................................................................................................................................30
2. CONTROL PANEL ASSEMBLY......................................................................................................................30
3. TOTAL ASSEMBLY.........................................................................................................................................30
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 and the dealer immediately.
IMPORTANT
The wire in this main lead coloured in accordance with the following code.
Green-and-yellow : Earth
Blue : Neutral
Brown : Live
As the colours of the wires in the main 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 :
The oven is designed for counter-top use only.
2
SPECIFICATIONS
MODEL
POWER SUPPLY
POWER CONSUMPTION
MICROWAVE
GRILL
COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W X H X D)
CAVITY DIMENSIONS (W X H X D)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
KOR-6Q2B5S
230V-50Hz, SINGLE PHASE WITH EARTHING
1200W
800W
2450MHz
465 x 279 x 327 mm (18.3 x 11.0 x 12.9 in)
301 x 230 x 283 mm (11.9 x 9.1 x 11.1 in)
APPROX. 11.3 kg (24.8 Ibs.)
59 min. 90 sec.
MICROWAVE
10 LEVELS
0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
4
2. FEATURE DIAGRAM
1
DOOR SEAL - Door seal maintains the microwave within the oven cavity and prevents microwave leakage.
2
DOOR HOOK - When the 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 resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.
9
OVEN FRONT PLATE
0
ROLLER GUIDE - Supports the glass cooking tray.
5
3. CONTROL PANEL
1
8
4
9
0
1
Display - Cooking time, power level, indicators and the present time are displayed.
2
Power - Used to set power level.
3
Defrost - Used to defrost foods for time.
4
Clock - Used to set clock.
5
Up - Used to add time to cooking.
6
Down - Used to decrease time from cooking.
7
Auto Cook - Used to cook or reheat a lot of favorite foods.
8
One Touch Cook - Used to cook or reheat specific quantities of food.
9
Time Set Pad - Used to set the cooking time and the present time.
0
Stop/Clear - Used to stop the oven operation or to delete the cooking data.
q
Start/Speedy cook - Used to start the oven and also used to set a reheat time.
7
5
6
3
2 q
6
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 and 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, 230 Volts, 50 Hz.
• Power supply cord is about 0.8 meters long.
• Used the voltage 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.
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 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 service-man 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.
7
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 off.
5. The oven door can be opened at any time during operation by pushing 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 pad.
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 the 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.
Make sure the oven is properly installed and plugged into the electrical.
Wattage output chart
The power level is set by pressing the POWER pad. The chart shows the display, the power level and the percentage of power.
Touch POWER 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%
00%
8
DISASSEMBLY AND ASSEMBLY
Cautions to be observed when troubleshooting.
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 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 grounding.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used while earthed.
It is imperative, therefore, to make sure it is earthed properly before beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation stopped and electric charge remains in the high voltage capacitor.
When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge.
4. When the 12A 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.
SHORT
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, HV fuse.
9
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Pull the cabinet backward.
2. To remove door assembly
1) Remove the screw 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.
10
✔
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.
PART CODE PART NAME DESCRIPTION
HIPS
A03
A04
3515204100
3511719500
STOPPER SINGE *T AS KOR-63150S
DOOR PAINTING AS KOR-6C0B5S
PP
HSW-3
(1) Remove the gasket door from door weld as.
(2) Remove the door frame from door weld as.
(3) Remove the stopper hinge top from door weld as.
(4) Remove the spring and the hook.
(5) Remove the barrier screen outer from door frame.
(6) Reverse the above steps for reassembly.
1
1
1
1
1
Q’TY
1
1
1
REMARK
11
4. Method to reduce the gap between the door seal and the oven front surface.
(1) To reduce gap located on part ‘A’
Loosen the screw on stopper hinge top, and then push the door to contact the door seal to oven front surface.
Tighten a screw.
(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.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm 2 .
12
✔
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.
PART CODE PART NAME DESCRIPTION
CONTROL HIPS
SCREW TAPPING
6N(800W,S)
T2S TRS 4X12 MFZN
Q’TY
1
1
1
4
REMARK
B04 7122401211
(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
(2) Remove four screws which secure the PCB assembly to control panel.
(3) Disconnect membrane tail from the connector of the PCB assembly.
(4) Detach membrane from the control panel.
(5) Reverse the above steps for reassembly.
13
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 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
<MAGNETRON>
14
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 reassembly.
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.
15
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 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 and 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 mounting screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely a mounting screw.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed
4mW/cm 2 , readjust interlock mechanism.
16
TROUBLESHOOTING 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 transformer, disconnect one lead 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 connected 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
Check continuity of both primary and secondary interlock switch with door colosed
Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close
(COM NO)
Check continuity of primary winding of low voltage transformer
Disconnect high voltage fuse and operate the unit
RESULT
Continuity
No Continuity
No Continuity
Continuity
Continuity
CAUSE
Malfunction of interlock monitor switch
Malfunction of interlock switch
Shorted contacts of primary interlock switch.
0 or infinite
Approx.
150~310
(normal)
Fuse again blows
Defective low voltage transformer
Defective low voltage transformer
REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace
17
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
Normal
CAUSE
Defective magnetron
Defective magnetron
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 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
Turn table 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 V DC
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
18
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
No microwave oscillation
CHECK
Check continuity of high voltage fuse
Replace high voltage fuse
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
RESULT
Continuity
Continuity
Continuity in backward direction
Continuity
0 or
No
Continuity
Check continuity of filament terminal of high voltage transformer
Check D.C. voltage being supplied to RELAY (RY1) coil
No
Continuity
0 V
Approx
15 V DC
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 or
RELAY (RY1) or open relay coil
REMEDY
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
19
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly.
1 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.
1 2. A distinct change in the display are not on when they numbers is the display.
1 3. One or more digits in the display are not on when they should be.
1 4. Display indicates a number different from one touched.
1 5. Specific numbers (for example 2 or 3) will not display when the panel is touched.
1 6. Display does not count down or up with time cooking or clock operation.
1 7. Oven is programable and cooks normally but no display shows.
1 8. Display obviously jumps in time while counting down.
1 9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when STOP/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
CAUSE
Malfunction of control circuit board
REMEDY
Replace control circuit board
Abnormal
Malfunction of the membrane keyboard
Replace the membrane keyboard
NOTE
Before following the particular steps listed above in the troubleshooting 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.
20
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. 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)
It 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 heat-up 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 should be B (Refer to SPECIFICATIONS)W±10.0%.
CAUTION :
1. Water load should be measured exactly to 1 liter.
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
21
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.
PROCEDURES
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 600cc glass beaker with an inside diameter of approx.
95mm(3.5in.).
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 5cm(2in.) 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 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.
22
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. 140
Ω
±10%
Filament winding....................................Approx. 0
Ω
Primary winding .....................................Approx. 2
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 is 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.
23
WIRING DIAGRAM
24
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 : 230V/Frequency : 50Hz
Terminal Voltage
5-6-7
LOAD
AC 12.6 V
NO LOAD
AC 14.7 V
NOTE :
1. Refer to Circuit 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
1
2
CHECK POINT
IC 1 PIN 5
IC 1 PIN 8
REMARK
5 VDC
T:20ms(50Hz)
3 IC 1 PIN 35 OR PIN 36
T:250ns(4MHz)
Check method
NO MEASURE POINT
1
2
MP1
MP2
WAVE FORM
DC 5V 0.25V
DC 12V 2.0V
REMEDY
Replace VL1, EC1
Replace EC2, D11, D13, D14
REMARK
NO LOAD
NO LOAD
NOTE :
Each measure point must be measured with GND point.
25
MP1
MP1
GND
Measure Point
26
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.
B
RY2
(TRAY
LAMP)
D10
Q10
- Check method
RY2
POINT
STATE
A
RELAY 2 ON 5VDC
RELAY 2 OFF GND
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
B
RY1
(M/W)
D8
RY1 Q9
- Check method
STATE
POINT
A
RELAY 1 ON 5VDC
RELAY 1 OFF GND
A
A
42
41
4. When the door is opened during operation, the count down timer does not stop.
A B
R1
CN1
1
2
R10
D.O.M SW
C1
+5V
-Check method
R9 C2
27
POINT
STATE
A
1) DOOR OPEN OPEN
2) DOOR CLOSED CLOSE
B
GND
12VDC
B
GND
12VDC
B
5VDC
GND
CHECK NO
1
METHOD
Check the stage (ON, OFF) of the door open monitor switch by resistance measurement.
5. When the digital clock does not operate properly.
Refer to Circuit Diagram.
POINT WAVE FORM
REMEDY
Replace door open monitor switch.
IC 1 PIN 8 T:20ms(50Hz)
* If clock does not keep exact time, you must check resistor R20 and zener diode ZD2.
27
2. PCB CIRCUIT DIAGRAM
28
✔
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. PCB LOCATION NO.
5
6
3
4
NO
1
2
BUZZER
NAME
C ARRAY
BZ1
CA1
SYMBOL
CAPACITOR ELEC
CAPACITOR ELEC
EC1
EC2
CONNECTOR WAFER CN1
CONNECTOR WAFER CN2
7
8
CONNECTOR WAFER CN3
DIODE RECTIFY D1~5, D8~D12
9 DIODE RECTIFY
10 DIODE ZENER
D13,14
ZD1
11 DIODE ZENER
12 LED DISPLAY
13 PCB MAIN
14 R ARRAY
ZD2
DP1
M158-1
RA2
15 R ARRAY
16 RESISTOR
17 RESISTOR
18 RESISTOR
19 RESISTOR
20 RESISTOR
21 RESISTOR
22 RESISTOR
23 RESONATOR CERA
24 IC REGULATOR
25 TRANSISTOR
26 TRANSISTOR
27 TRANSISTOR
28 CAPACITOR CERA
29 CAPACITOR CERA
30 TRANS POWER
31 WIRE COPPER
32 WIRE COPPER
33 SW RELAY
34 IC MICOM
35 WIRE COPPER
36 SW RELAY
J1~J10,J13,J14
J11,J12
RY2
IC1
SJ1,SJ5
RY1
SPECIFICATION
BM-20K
7P(6) 1000PF M 50V
50V RS 10UF
25V RSS 1000MF
YW396-02V
FCZ 254-11
YW396-05AV
1N4148
KN4004A
UZ- 3.3BSB 1/2W
UZ- 5.1BSB 1/2W
ELF-496GWB
81.5X139.9
8P(7) 1/8 100K OHM J
RA1
R2~8
7P(6) 1/8 100K OHM J
1/6W 330 5%
R1,10,12,17,18,22 1/6W 1K 5%
R9 1/6W 100K 5%
R11
R13,R19,R20
R14
R21
1/6W 200 5%
1/6W 10K 5%
1/6W 1M 5%
1/4W 51 5%
CR1
VL1
Q1~5
Q9~11
Q6
C5
C1~4,C6~7
LVT1
CRT 4.00MS
MC7805C
KRA106M
KRC106M
KTA-1266Y
102 50V Z AXIAL
104 50V Z AXIAL
DMR-631FS
1/0.52 TIN COATING
1/0.52 TIN COATING
CS11-12SH 1C 1P
HMS81C1708B-HN011
1/0.52 TIN COATING
G5G-1A DC12V
RA-87X104J
RD-AZ331J-
RD-AZ102J-
RD-AZ104J-
RD-AZ201J-
RD-AZ103J-
RD-AZ105J-
RD-4Z510J-
5P4R00MTS-
1CPMC7805C
TZRA106M--
TZRC106M--
TZTA1266Y-
CCZB1H102K
CCZF1H104Z
5EPU035302
PART CODE
3515600100
CN6XB-102M
CEXE1H100A
CEXF1E102V
3519150520
441M367160
3519150510
DZN4148---
DZN4004A--
DZUZ3R3BSB
DZUZ5R1BSB
DDDG631H--
3514315411
RA-88X104J
85801052GY
85801053GY
5SC0101128
150S63MB00
85801052GY
5SC0101121
6
1
1
1
5
3
1
1
1
1
1
3
6
1
1
7
1
1
12
2
1
1
1
1
1
1
2
1
1
10
Q’TY
1
1
1
1
1
1
29
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
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).
F36
F37
F38
F39
F40
F29
F30
F31
F32
F33
F34
F35
F41
F42
F43
F44
F45
F15
F16
F17
F18
F19
F10
F11
F12
F13
F14
F20
F21
F22
F23
F24
F25
F26
F27
F28
F05
F06
F07
F08
F09
NO
A00
B00
F01
F02
F03
F04
3515201101
3512781400
4415A17352
4415A66910
3518571000
4415A17352
3513702610
3513811710
3513601600
7121400611
3966310100
7272400811
3511406220
3517402130
3514700900
3512509210
3517203600
PART CODE
351179430
PART NAME
DOOR AS
PKCPSWBA00 CONTROL PANEL AS
3510808100
7112401011
CABINET
SCREW TAPPING
3516117400
7122401211
CAVITY AS
SCREW TAPPING
7122401211
7112401011
35113AEQ0D
7122401211
7121300611
SCREW TAPPING
SCREW TAPPING
CORD POWER AS
SCREW TAPPING
SCREW TAPPING
3518902600
3518607600
7121402511
3693512310
3512517000
3511800300
3518003700
3516004000
7S422X4081
3513003200
3518302200
3518400900
3518701100
3518119880
3516003700
3510316000
7112401011
3512100900
7S422X4081
THERMOSTAT
NOISE FILTER
SCREW TAPPING
MOTOR SHADED POLE
GUIDE WIND
FAN
MAGNETRON
SPECIAL SCREW
SPECIAL SCREW
HOLDER HV CAPACITOR
CAPACITOR HV
DIODE HV AS
FUSE HV
TRANS HV
SPECIAL SCREW
BASE
SCREW TAPPING
FOOT
SPECIAL SCREW
STOPPER HINGE *U
HARNESS MAIN
SW MICRO
SW MICRO
SWITCH PUSH
SW MICRO
LEVER LOCK
LOCK
LAMP
SCREW TAPPING
MOTOR SYNCRO
SCREW TAPTITE
COVER WAVE GUIDE
COUPLER
ROLLER
GUIDE ROLLER
TRAY
KOR-6C2B5S
DESCRIPTION
KOR-6Q2B5S
CR 0.5T
T1 TRS 4X10 MFZN
KOR-6NM51A
T2S TRS 4X12 MFZN
T2S TRS 4X12 MFZN
T1 TRS 4X10 MFZN
3X0.75 70X70 100-RTML
T2S TRS 4X12 MFZN
T2S PAN 3X6 MFZN
OFF:90 ON:60 H #187
DWLF-M12 A
T2S PAN 4X25 MFZN
230V 20W MW10CA-M02
PP
PP+30%GLASS
2M218JFL
T2 BOLT FLANGE 5X12 DACRO
TT3 TRS 4X8 SE MFZN
SECC T0.6
2100VAC 0.98UF #187
HVR-1X-30B #187
5KV 0.55A HV-41A55-02
R1S580(EA00)
TT3 HEX 4X8 FLG MFZN
SBHG T0.7
T1 TRS 4X10 MFZN
PP DASF-130
TT3 TRS 4X8 SE MFZN
SCP-1 T2.5
KOR-6NMC3S
VP-533A-OF SPNO #187 200G
VP-531A-OF/SZM-V16-FA-61
MP101C
VP-533A-OF SPNO #187 200G
POM
POM
BL 240V 25W T25 C7A H187
T2S PAN 4X6 MFZN
220V 2.5W GM-16-24FD12
TT3 TRS 4X8 MFZN
PP J640A WHITE
XAREC
TEFLON
PP 5113MF6 A 353B
GLASS
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
1
1
5
2
1
1
4
1
1
1
1
2
1
1
1
Q'TY
1
1
1
3
1
1
31
S/M NO. : R6Q2B5S001
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: Jul. 2004
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Table of contents
- 3 SAFETY AND PRECAUTIONS
- 3 1. FOR SAFE OPERATION
- 3 2. FOR SAFE SERVICE PROCEDURES
- 4 SPECIFICATIONS
- 5 EXTERNAL VIEW
- 5 1. OUTER DIMENSION
- 6 2. FEATURE DIAGRAM
- 7 3. CONTROL PANEL
- 8 INSTALLATION
- 9 OPERATIONS AND FUNCTIONS
- 10 DISASSEMBLY AND ASSEMBLY
- 17 INTERLOCK MECHANISM AND ADJUSTMENT
- 18 TROUBLE SHOOTING GUIDE
- 22 MEASUREMENT AND TEST
- 22 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
- 23 2. MICROWAVE RADIATION TEST
- 24 3. COMPONENT TEST PROCEDURE
- 25 WIRING DIAGRAM
- 26 PRINTED CIRCUIT BOARD
- 26 1. CIRCUIT CHECK PROCEDURE
- 29 2. PCB CIRCUIT DIAGRAM
- 30 3. P.C.B. LOCATION NO
- 31 EXPLODED VIEW AND PARTS LIST
- 31 1. DOOR ASSEMBLY
- 31 2. CONTROL PANEL ASSEMBLY
- 31 3. TOTAL ASSEMBLY