Daewoo | KOR-6Q1B3A | Service manual | Daewoo KOR-6Q1B3A Service manual

Daewoo KOR-6Q1B3A Service manual
S/M No. : R6Q1B3A001
Service Manual
Microwave Oven
Model: KOR-6Q1B3A
✔ 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
FOR SAFE OPERATION ......................................................................................................................................2
FOR SAFE SERVICE PROCEDURES .................................................................................................................2
SPECIFICATIONS ...............................................................................................................................................................3
EXTERNAL VIEW................................................................................................................................................................4
OUTER DIMENSION.............................................................................................................................................4
FEATURE DIAGRAM ............................................................................................................................................5
CONTROL PANEL ................................................................................................................................................6
INSTALLATION ...................................................................................................................................................................7
OPERATIONS AND FUNCTIONS.......................................................................................................................................8
DISASSEMBLY AND ASSEMBLY......................................................................................................................................9
INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................16
TROUBLESHOOTING GUIDE ..........................................................................................................................................17
MEASUREMENT AND TEST ............................................................................................................................................21
MEASUREMENT OF THE MICROWAVE POWER OUTPUT ............................................................................21
MICROWAVE RADIATION TEST .......................................................................................................................22
COMPONENT TEST PROCEDURE ...................................................................................................................23
WIRING DIAGRAM............................................................................................................................................................24
PRINTED CIRCUIT BOARD..............................................................................................................................................25
CIRCUIT CHECK PROCEDURE ........................................................................................................................25
PCB CIRCUIT DIAGRAM....................................................................................................................................28
PCB LOCATION NO ...........................................................................................................................................29
EXPLODED VIEW AND PARTS LIST...............................................................................................................................30
DOOR ASSEMBLY .............................................................................................................................................30
CONTROL PANEL ASSEMBLY..........................................................................................................................30
TOTAL ASSEMBLY.............................................................................................................................................30
1
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 have excessive emission level 5mW/cm2, the service person should:
(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.
2
SPECIFICATIONS
MODEL
KOR-6Q1B3A
POWER SUPPLY
120V~60Hz, SINGLE PHASE WITH GROUNDING
MICROWAVE
POWER
GRILL
CONSUMPTION
COMBINATION
1000W
CONVECTION
MICROWAVE ENERGY OUTPUT
700W
MICROWAVE FREQUENCY
2450MHz
OUTSIDE DIMENSIONS (W X H X D)
465 x 279 x 327 mm (18.3 x 11.0 x 12.9 in)
CAVITY DIMENSIONS (W X H X D)
301 x 230 x 283 mm (11.9 x 9.1 x 11.1 in)
NET WEIGHT
Approx. 11.3 kg (24.8 Ibs.)
TIMER
59 min. 99 sec.
FUNCTION SELECTIONS
MICROWAVE
POWER SELECTIONS
10 LEVELS
CAVITY VOLUME
0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
327
279
465
4
2. FEATURE DIAGRAM
1 SAFETY INTERLOCK SYSTEM
2 DOOR SCREEN
Allows viewing of food. The screen is transparent to light, but prevents microwaves escaping.
3 DOOR LATCH
When the door is closed, it will automatically shut off. If the door is opened while the oven operating, the magnetron tube
will immediately stop operating.
4 OVEN CAVITY
5 DOOR SEAL
Door seal surfaces prevent microwave escaping from the oven cavity.
6 GLASS COOKING TRAY
Made of special heat resistant glass. The tray can be easily removed for cleaning. Make sure it is correctly
positioned(indentation) before operating. Place food in a suitable container(dish ) on the tray.
7 ROLLER GUIDE
Supports the glass cooking tray.
8 COUPLER
This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.
9 CONTROL PANEL
5
3. CONTROL PANEL
1
2
4
5
3
6
7
8
9
0
1 DISPLAY - Cooking time, power level, indicators and present time are displayed.
2 ONE TOUCH - Used to cook or reheat specific quantities of food.
3 POWER - Used to set power level.
4 + - Used to add time to cooking.
5 - - Used to decrease time from cooking.
6 TIME SET PAD - Used to set the cooking time and the present time.
7 DEFROST - Used to defrost foods for time.
8 CLOCK - Used to set clock.
9 STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
0 START/SPEEDY COOK - Used to start the oven and also used to set a reheat time.
6
INSTALLATION
1. Steady, flat location.
This microwave oven should be set on a steady, flat surface.
2. Leave space behind and side.
All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated
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 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 15 amperes, 120Volts, 60Hz 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 a dealer immediately.
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
ecurely. 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 outlet.
Wattage output chart
The power level is set by touching the POWER pad. The chart shows the display, the power level and the percent age of power.
Touch POWER pad
Power level(Display)
Approximate Percentage of Power
Once
P-HI
100%
Twice
P-90
90%
3 times
P-80
80%
4 times
P-70
70%
5 times
P-60
60%
6 times
P-50
50%
7 times
P-40
40%
8 times
P-30
30%
9 times
P-20
20%
10 times
P-10
10%
11 times
P-00
0%
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 with 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 stopped and electric
charge remains in the high voltage capacitor.
When replacing or checking parts, short between oven chassis and
the negative high terminal of the high voltage capacitor by using a
properly insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor
switch; replace primary interlock switch, secondary interlock switch and
interlock monitor switch.
5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.
6. Do not operate without cabinet.
CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.
WARNING : When servicing the appliance, take a care of touching or replacing high potential parts because of
electric 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
A01
3512206440
FRAME DOOR
HIPS
1
A02
3517007300
BARRIER-SCREEN *O
PET T 0.125
1
A03
3515204100
STOPPER HINGE *T AS
KOR-63150S
1
A04
3511719500
DOOR PAINTING AS
KOR-6C0B5S
1
A05
3517002800
BARRIER-SCREEN *I
POLYESTER T 0.1
1
A06
3512300210
GASKET DOOR
PP
1
A07
3513100730
HOOK
POM BLACK
1
A08
3515101320
SPRING HOOK
HSW-3
1
(1) Remove the gasket door from door painting assembly.
(2) Remove the barrier screen inner from door painting assembly.
(3) Remove the door frame from door painting assembly.
(4) Remove the stopper hinge top from door painting assembly.
(5) Remove the spring and the hook.
(6) Remove the barrier screen outer from door frame.
(7) Reverse the above steps for reassembly.
11
Q’TY
REMARK
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.
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✔ 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
Q’TY
B01
3518571600
SWITCH MEMBRANE
KOR-6Q1B3A
1
B02
3516732020
CONTROL-PANEL
ABS VT-0826, AF-348 HG
1
B03
PKMPMSFM00
PCB MAIN MANUAL AS
6N(700W, A)
1
B04
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
4
B05
3516911000
BUTTON DOOR OPEN
ABS SG-0760D, SG-175
1
B06
441G430171
SPRING BUTTON
SWP DIA. 0.7
1
B07
3513702700
LEVER DOOR OPEN
PP
1
REMARK
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) Remove the PCB from the control panel.
5) Remove the membrane, lever door open, spring button and button door open from the control panel.
6) 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.
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NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to
prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave
leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
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14
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8. To remove wind guide assembly.
1) Remove a screw for earthing.
2) Remove a screw which secure the wind guide assembly.
3) Draw forward the wind guide assembly.
4) Pull the fan from the motor shaft.
5) Remove two screws which secure the motor shaded pole.
6) Remove the motor shaded pole.
7) 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.
CONDITION : DOOR CLOSED
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 microswitch. Then the button of the primary interlock switch
bring it under ON 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 OFF condition and presses the button of the secondary interlock switch to bring it under
ON condition.
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be "OFF" condition before other switches are "ON" condition.
When the door is opened, the interlock monitor switch should be "ON" condition after other switches are "OFF" condition.
(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/cm2, 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
( COM NC )
RESULT
Continuity
(COM NC)
CAUSE
Malfunction of
Interlock
monitor switch
REMEDY
Replace
(NOTE)
No continuity
No
Continuity
Check continuity of
both primary and secondary interlock switch with door closed
Malfunction of
interlock switch
Replace
(NOTE)
Continuity
Continuity
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
Disconnect high voltage
fuse and operate the unit
0
or infinite
Approx.
150~310
( normal )
Fuse again
blows
17
Shorted contacts
of primary interlock Switch
Defective low
voltage transformer
Defective
high voltage
transformer
Replace
Replace
Replace
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Outlet has
proper voltage
fuse does not
blow.
Check continuity of
magnetron
No
continuity
Defective
magnetron.
Replace
Check continuity of noise filter
board
No
continuity
Defective line
filter board
Replace
Check continuity of
power supply cord
No
continuity
Open power
supply cord
Replace
Normal
Defective touch
control circuit
Adjust
NOTE 1
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
CHECK
RESULT
CAUSE
REMEDY
Turn table
motor and
oven lamp
do
not turn on
Check continuity of
primary interlock switch
No
continuity
Malfunction of
primary interlock
switch
Adjust or
replace
Check continuity of
secondary interlock
and D.O.M switch
No
continuity
Malfunction of
secondary
Interlock and
D.O.M switch
Adjust or
replace
Check D.C voltage
being supplied to
RELAY(RY2) coil
0V
Defective touch
control Circuit
Replace
Approx.
15V DC
Faulty contacts
of RELAY
(RY2) or open
relay coil.
Replace
18
(TROUBLE 3)
No microwave oscillation even though fan motor rotates.
CONDITION
CHECK
No
microwave
oscillation
Check continuity of high
voltage fuse
RESULT
CAUSE
REMEDY
No Continuity
Check continuity of high
voltage capacitor terminals
with wires removed
Continuity
Defective high
voltage transformer
Replace
Check continuity of high voltage
rectifier in forward and backward
direction with DC megger
Continuity in
backward
direction
Defective high
voltage rectifier
Replace
Connect megger leads to magnetron terminal and magnetron
body
Continuity
Defective magnetron
Replace
Check resistance of primary and
secondary coil of high voltage
transformer
0
Defective high
voltage transformer
Replace
Check continuity of magnetron
with wires removed
Check continuity of filament terminal of high voltage transformer
or
No
Continuity
No
Continuity
Defective magnetron
Defective high
voltage transformer
0V
Check D.C. voltage being supplied to RELAY (RY1) coil
Defective touch
control circuit
Approx
15V DC
19
Faulty
contacts or
RELAY (RY1)
or open
relay coil
Replace
Replace
Replace
Replace
(TROUBLE 4)
The following visual conditions indicate a probable defective touch control circuit or membrane switch
assembly.
1. Incomplete segments
(1) Segments missing
(2) Partial 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 numbers is the
display.
3. One or more digits in the display are not on when they should be.
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 STOP/CLEAR pad is touched. (in case of setting the present time)
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
CHECK
Display does
not show
programming
at all, even if
keyboard is
touched.
Check each pad for
continuity of the membrane
keyboard for the following
keyboard check procedure
RESULT
CAUSE
REMEDY
Normal
Malfunction
of control circuit
board
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 membrand 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 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)
70
64
60
56
52
49
47
44
42
40
38
B(W)
600
650
700
750
800
850
900
950
1000
1050
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.
85mm(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/cm2.
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 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.
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. 110
10%
Filament winding
Approx. 0
Primary winding
Approx. 1
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 once the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10M .
(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 A normal diode s resistance will be infinite in one direction and
several hundred K 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 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.
6. Interlock switches
(1) You can test continuity of safety interlock and monitor switch by using ohmmeter.
(2) The switch peration is checked by zero/unlimited.
The meter should indicate zero resistance.
(3) The sequence of check is interlock monitor switch, primary and secondary interlock switches check.
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 : 120V/Frequency : 60Hz
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
CHECK POINT
1
IC 1 PIN 5
2
IC 1 PIN 8
REMARK
5 VDC
T:16.67ms(60Hz)
3
IC 1 PIN 35 OR PIN 36
T:250ns(4MHz)
Check method
NO
MEASURE POINT
1
MP1
2
MP2
WAVE FORM
REMEDY
REMARK
DC 5V 0.25V
Replace VL1, EC1
NO LOAD
DC 12V 2.0V
Replace EC2, D11, D13, D14
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
A
RY2
42
D10
(TRAY
LAMP)
Q10
RY2
- Check method
POINT
A
B
RELAY 2 ON
5VDC
GND
RELAY 2 OFF
GND
12VDC
STATE
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
B
A
RY1
41
D8
(M/W)
Q9
RY1
- Check method
POINT
A
B
RELAY 1 ON
5VDC
GND
RELAY 1 OFF
GND
12VDC
STATE
4. When the door is opened during operation, the count down timer does not stop.
A
B
R1
CN1
1
2
27
R10
C1
D.O.M SW
R9
C2
+5V
-Check method
POINT
A
B
1) DOOR OPEN
OPEN
5VDC
2) DOOR CLOSED
CLOSE
GND
STATE
CHECK NO
1
METHOD
REMEDY
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
IC 1 PIN 8
T:16.67ms(60Hz)
* If clock does not keep exact time, you must check resistor R20 and zener diode ZD2.
27
Replace door open monitor
switch.
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.
NO
NAME
SYMBOL
SPECIFICATION
PART CODE
Q’TY
1
BUZZER
BZ1
BM-20K
3515600100
1
2
C ARRAY
CA1
7P(6) 1000PF M 50V
CN6XB-102M
1
3
CAPACITOR ELEC
EC1
50V RS 10UF
CEXE1H100A
1
4
CAPACITOR ELEC
EC2
25V RSS 1000MF
CEXF1E102V
1
5
CONNECTOR WAFER
CN1
YW396-02V
3519150520
1
6
CONNECTOR WAFER
CN2
FCZ 254-11
441M367160
1
7
CONNECTOR WAFER
CN3
YW396-05AV
3519150510
1
8
DIODE RECTIFY
D1~5, D8~D12
1N4148
DZN4148---
10
9
DIODE RECTIFY
D13,14
KN4004A
DZN4004A--
2
10
DIODE ZENER
ZD1
UZ- 3.3BSB 1/2W
DZUZ3R3BSB
1
11
DIODE ZENER
ZD2
UZ- 5.1BSB 1/2W
DZUZ5R1BSB
1
12
LED DISPLAY
DP1
ELF-496GWB
DDDG631H--
1
13
PCB MAIN
M158-1
81.5X139.9
3514315411
1
14
R ARRAY
RA2
8P(7) 1/8 100K OHM J
RA-88X104J
1
15
R ARRAY
RA1
7P(6) 1/8 100K OHM J
RA-87X104J
1
16
RESISTOR
R2~8
1/6W 330 5%
RD-AZ331J-
7
17
RESISTOR
R1,10,12,17,18,22
1/6W 1K 5%
RD-AZ102J-
6
18
RESISTOR
R9
1/6W 100K 5%
RD-AZ104J-
1
19
RESISTOR
R11
1/6W 200 5%
RD-AZ201J-
1
20
RESISTOR
R13,R19,R20
1/6W 10K 5%
RD-AZ103J-
3
21
RESISTOR
R14
1/6W 1M 5%
RD-AZ105J-
1
22
RESISTOR
R21
1/4W 51 5%
RD-4Z510J-
1
23
RESONATOR CERA
CR1
CRT 4.00MS
5P4R00MTS-
1
24
IC REGULATOR
VL1
MC7805C
1CPMC7805C
1
25
TRANSISTOR
Q1~5
KRA106M
TZRA106M--
5
26
TRANSISTOR
Q9~11
KRC106M
TZRC106M--
3
27
TRANSISTOR
Q6
KTA-1266Y
TZTA1266Y-
1
28
CAPACITOR CERA
C5
102 50V Z AXIAL
CCZB1H102K
1
29
CAPACITOR CERA
C1~4,C6~7
104 50V Z AXIAL
CCZF1H104Z
6
30
TRANS POWER
LVT1
DMR-631P
5EPU035302
1
31
WIRE COPPER
J1~J10,J13,J14
1/0.52 TIN COATING
85801052GY
12
32
WIRE COPPER
J11,J12
1/0.52 TIN COATING
85801053GY
2
33
SW RELAY
RY2
CS11-12SH 1C 1P
5SC0101128
1
34
IC MICOM
IC1
HMS81C1708B-HN011
150S63MB00
1
35
WIRE COPPER
SJ1,SJ5
1/0.52 TIN COATING
85801052GY
1
36
SW RELAY
RY1
G5G-1A DC12V
5SC0101121
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 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).
REF NO.
PART CODE
A00
3511719430
B00
PKCPSWA900
F01
PART NAME
DESCRIPTION
Q'TY
DOOR AS
KOR-6C2B5S
1
CONTROL-PANEL AS
KOR-6Q1B3A
1
3510808100
CABINET
CR 0.5T
1
F02
7112401011
SCREW TAPPING
T1 TRS 4X10 MFZN
3
F03
3516117400
CAVITY AS
KOR-6NM51A
1
F04
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
1
F05
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
1
F06
7112401011
SCREW TAPPING
T1 TRS 4X10 MFZN
2
F07
35113NKX55
CORD POWER AS
3X18AWG 40X80 110-RTML 600W ONLY
1
F08
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
1
F09
7121300611
SCREW TAPPING
T2S PAN 3X6 MFZN
1
F10
3518902600
THERMOSTAT
OFF:90 ON:60 H #187
1
F11
7121402511
SCREW TAPPING
T2S PAN 4X25 MFZN
2
F12
3963821620
MOTOR SHADED POLE
120V 60HZ MW08XA-M01
1
F13
3512517000
GUIDE WIND
PP
1
F14
3511800300
FAN
PP+30%GLASS
1
F15
3518003430
MAGNETRON
RM228JDF 4CF
1
F16
3516004000
SPECIAL SCREW
T2 BOLT FLANGE 5X12 DACRO
1
F17
7272400811
SCREW TAPTITE
TT3 TRS 4X8 MFZN
1
F18
3513003200
HOLDER HV CAPACITOR
SECC T0.6
1
F19
3518301501
CAPACITOR HV
2100VAC 0.77UF #187
1
F20
3518400900
DIODE HV AS
HVR-1X-30B #187
1
F21
3518118201
TRANS HV
DY-R70A0-63T A
1
F22
3516003700
SPECIAL SCREW
TT3 HEX 4X8 FLG MFZN
4
F23
3510316000
BASE
SBHG T0.7
1
F24
7112401011
SCREW TAPPING
T1 TRS 4X10 MFZN
5
F25
3512100900
FOOT
PP DASF-130
2
F26
7272400811
SCREW SPECIAL
TT3 TRS 4X8 MFZN
1
F27
3515201101
STOPPER HINGE *U
SCP-1 T2.5
1
F28
4415A17352
SW MICRO
VP-533A-OF SPNO #187 200
1
F29
4415A66910
SW MICRO
VP-531A-OF /SZM-V16-FA-61
1
F30
3518571000
SWITCH PUSH
MP101C
1
F31
3513702600
LEVER LOCK
POM
1
F32
3513815810
LOCK
PP(GRAY) TB53
1
F33
3512781440
HARNESS MAIN
KOR-6NBG3A
1
F34
3513601500
LAMP
BL 125V 25W T25 C5A H187
1
F35
7121400611
SCREW TAPPING
T2S PAN 4X6 MFZN
1
F36
3966820200
MOTOR SYNCRO
120V 2W GM-16-12F17
1
F37
7272400811
SCREW TAPTITE
TT3 TRS 4X8 MFZN
1
F38
3511406200
COVER WAVE GUIDE
PP J640A WHITE
1
F39
3517402130
COUPLER
XAZEC
1
F40
3514700900
ROLLER
TEFLON
3
F41
3512509210
GUIDE ROLLER
PP 5113MF6,A353B
1
F42
3517203600
TRAY
GLASS
1
31
DAEWOO ELECTRONICS CORP.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
S/M NO. : R6Q1B3A001
PRINTED DATE: Jul. 2004
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