kom9p11 parts diagram
S/M No. : OM9P2CBS001
Service Manual
Microwave Oven
Model: KOM-9P2CBS
✔ 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).
May. 2012
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
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ......................................................................................................1
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. FEATURES DIAGRAM......................................................................................................................................5
3. 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
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. GUIDE WIND ASSEMBLY ..............................................................................................................................30
4. TOTAL ASSEMBLY.........................................................................................................................................30
1
SAFETY AND PRECAUTIONS
CAUTION
This device is to be Serviced only by Properly Qualified Service Personel. 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. WAVEGUIDE FLANGES AND
PASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY
ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN SAVEGUIDE OR ANTENNA WHILE THE
DEVICE IS ENERGIZED.
2
SPECIFICATIONS
POWER SUPPLY
MICROWAVE
240V AC, 50Hz SINGLE PHASE WITH GROUNDING
INPUT POWER
1600 W
ENERGY OUTPUT
1100 W
FREQUENCY
2,450MHz
OUTSIDE DIMENSIONS (W
CAVITY DIMENSIONS (W
H
H
D)
D)
542 x 329 x 461 mm
350 x 230 x 357 mm
CAVITY VOLUME
29 L
NET WEIGHT
APPROX. 18 Kg
TIMER
60 min.
POWER SELECTIONS
5 Levels
* Specifications are subject to change without notice.
3
EXTERNAL VIEW
1. OUTER DIMENSION
461
329
542
4
2. FEATURES DIAGRAM
3 5
4
2
7
8
1
6
1 Safety Interlock System.
5 Door Seal - Door seal maintains the
microwave energy within the oven cavity and
prevents microwave leakage.
2 Door Viewing Screen - Allows viewing of food.
The screen is designed so that light can pass
through, but not the microwave.
6 Plate Tray - Made of special heat resistant
GLASS. Food in a proper receptacle is placed
on this plate for cooking.
3 Door Hook - When door is closed, it will automatically shut off. If the door is opened while
the oven is operating, magnetron will immediately stop operating.
7 Stirrer Cover - This is located on the ceiling
with the stirrer fan.
4 Oven Cavity.
8 Inlet cover - Protect the air hole from splashes
of cooking foods.
5
3. CONTROL PANEL
1
3
2
4
5
6
8
9
7
0
q
w
1 MICROWAVE indicator, showing microwaving
in progress.
7 TIME SET PAD - Used to set the cooking time.
8 CHECK - Used to check cooking data.
2 DEFROST indicator, showing defrosting in
progress.
9 DOUBLE QUANTITY - Used to extend programmed cooking time.
3 PERCENTAGE of power indicator.
0 POWER - Used to set power level.
4 CHILD LOCK indicator.
q STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
5 PROGRAM - Used to save cooking data.
w START /+30SEC - Used to start the oven and
also used to set a reheat time.
6 DEFROST - Used to defrost foods for time.
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 7 amperes, 230-240 Volts, 50 Hz.
• Power supply cord is about 1.0 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
11. Connect the mains lead to an electrical outlet.
12. 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.
13. Close the door securely.
14. The oven door can be opened at any time during operation by pulling the door handle on the door.
The oven will automatically shut off. To restart the oven, close the door and then touch the START pad.
15. Each time a pad is touched. a BEEP will sound to acknowledge the touch.
16. The oven automatically cooks on full power unless set to a lower power level.
17. The display will show “: 0” when the oven is plugged in.
18. Time clock returns to the “: 0” when the cooking time ends.
19. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained.
To erase all information, touch the STOP/CLEAR pad once more. If the oven door is opened
during the oven
operation, all information is retained.
10. 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 touching the POWER pad. The chart shows the display, the power level and the percentage
of power.
Touch POWER pad.
Power Level (Display)
once
100
100%
twice
80
80%
3 times
60
60%
4 times
40
40%
5 times
20
20%
8
Approximate Percentage of Power
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 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 four screws on cabinet back.
2) Pull the cabinet backward.
2. To remove door assembly
1) Remove three 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.
10
3. To remove door parts.
A05
A05-2
DOOR ASSEMBLY :
3511731000
A05-3
A06
A09
A01
A10
A02
A05-1
A07
A08
PART NAME
DESCRIPTION
A04
A03
REF No.
PART CODE
A00
3511731000
DOOR AS
KOM-9P2CBS
1
A01
3511714800
DOOR PAINTING AS
KOC-910K0S
1
A02
3511714700
DOOR SEAL AS
KOC-910K0S
1
A03
3513101200
HOOK
POM
1
A04
3515102300
SPRING HOOK
PW1
1
A05
3511731200
DOOR SUB AS
KOM-9P0C9S
1
A06
3517007120
BARRIER-SCREEN *O
TEMP GLASS T3.2 CLEAR
1
A07
3512604340
HANDLE DOOR
AL
1
A08
7001401011
SCREW MACHINE
PAN 4X10 MFZN
2
A09
3515204900
STOPPER HINGE *T AS
KOC-1B0K0S
1
A10
3512302410
GASKET DOOR
LUPOL 2300
1
1) Remove the gasket door from the door painting as.
2) Remove the barrier screen inner from the door painting as.
3) Remove the door sub as from the door painting as.
4) Remove the stopper hinge top as from the door painting as.
5) Remove the spring hook and the hook from the door painting as.
6) Remove the barrier screen outer from the door sub as.
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 two screws on the stopper hinge top, and then
push the door to contact the door seal to the oven front surface.
• Tighten two screws.
(2) To reduce gap located on part ‘B’
• Loosen two screws on the stopper hinge under, and then
push the door to contact the door seal to the oven front surface.
• Tighten two screws.
(3) To reduce gap located on part ‘C’
• Loosen the screw on the interlock switch assembly located
the top of the oven body.
• Draw the interlock switch assembly inward as possible to
engage with the hook on the door bottom.
• Tighten a screw.
(4) To reduce gap located on part ‘D’
• Loosen the screw on the interlock switch assembly located
the bottom of the oven body.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.
12
5. To remove control panel parts.
B03
B02
B01
B04
C/PANEL ASSEMBLY :
PKCPSWZZ12
B05
REF No.
PART CODE
PART NAME
DESCRIPTION
Q’TY
B00
PKCPSWZZ12
CONTROL-PANEL AS
KOM-9P2CBS
1
B01
3516741600
CONTROL-PANEL
ABS SG-175, SG-0760D
1
B02
3518574220
SWITCH MEMBRANE
KOM-9P2CBS
1
B03
3511621100
DECORATOR C-PANEL
STS430 T0.5 H/L
1
B04
7122401211
SCREW TAPPING
T2S TRS 4*12 MFZN
4
B05
PKMPMSB710
PCB MAIN MANUAL AS
KOR-1P5C9S
1
REMARK
1) Remove the screw which secure the control panel as, push up two snap fits and draw forward the control panel assembly.
2) Remove four screws which secure the PCB assembly to the control panel as.
3) Disconnect membrane tail from the connector of the PCB assembly.
4) Remove the PCB from the control panel sub as.
5) Reverse the above steps for reassembly.
13
6. To remove guide wind parts.
C05
C04
C02
C03
GUIDE WIND ASSEMBLY :
3512524450
C01
REF No.
PART CODE
PART NAME
DESCRIPTION
C00
3512524450
GUIDE WIND AS
KOR-1P559S AMANA
C01
3512515300
GUIDE WIND
PP
1
C02
3963514380
MOTOR SHADED POLE
230V 50Hz OEM-15DWC2-C03
1
C03
7121403011
SCREW TAPPING
T2S PAN 4X30 MFZN
2
C04
3511800100
FAN
P.P GF20
1
C05
3518605500
NOISE-FILTER
DWLF-M07
1
1) Remove two screws for earthing and for fixing to rear-plate.
2) Remove the noise filter from the guide wind.
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.
14
Q’TY
REMARK
7. To remove high voltage capacitor.
1) Remove the 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
8. To remove magnetron.
1) Remove three screws which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage.
It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
Wave guide
Magnetron antenna
Magnetron antenna
Metalic
gasket
plate
Stub
Cooling fin
Filament
terminal
<MAGNETRON>
Metallic gasket plate
15
9. To remove wind guide assembly.
1) Remove the screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove the 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.
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
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.
RD/BL
RD/GY
RD
WH
BK
DOM SWITCH
SECONDARY INTERLOCK SW
(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 NO condition. The lock lever 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 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 two mounting screws.
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/cm2, readjust interlock mechanism.
17
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
CHECK
RESULT
Check continuity of interlock
monitor switch with door closed
Continuity
Fuse blows.
CAUSE
Malfunction of
interlock monitor switch
REMEDY
Replace
NOTE 1
No Continuity
Replace fuse
Check continuity of of primary
interlock switch contact with
door partially open until interlock monitor switch contact
close
Check continuity of primary
winding of low voltage
transformer
Continuity
0Ωor infinite
Approx.
1000 Ω
(normal)
Normal
Disconnect one side of the lead
wire connected form high
voltage transformer to the high
voltage capacitor and operate
the unit
Fuse again
blows
18
Shorted
contacts of
primary
interlock switch.
Defective low
voltage
transformer
Defective high
voltage capacitor
Defective high
voltage
transformer
Replace
NOTE 1
Replace
Replace
Replace
CONDITION
Outlet has
proper
voltage Fuse
does not
blow.
CHECK
RESULT
CAUSE
REMEDY
No
Continuity
Defective
magnetron
Replace
Check continuity of magnetron
Check continuity of
power supply cord
No
Continuity
Open power
supply cord
Replace
Normal
Defective touch
control circuit
Replace
Malfunction of
secondary
interlock switch
Replace
Display do not shown
countdown
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
CHECK
RESULT
CAUSE
REMEDY
Oven lamp
does not turn
on
Check continuity of primary
interlock switch
No
Continuity
Malfunction of
primary interlock
switch
Adjust or
replace
Check continuity of secondary
interlock switch
No
Continuity
Check D.C. voltage being
supplied to RELAY (RY2) coil
0V
Defective touch
control circuit
Approx.
15 VDC
Faulty contacts of
RELAY (RY2) or
open relay coil
19
Malfunction of
secondary
interlock switch
Adjust or
replace
Replace
Replace
(TROUBLE 3)
No microwave oscillation even though fan motor rotates.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No
microwave
oscillation
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 Ωor ∞
Defective high
voltage
transformer
Replace
No
Continuity
Defective
magnetron
Replace
No
Continuity
Defective high
voltage
transformer
Replace
Check continuity of magnetron
with wires removed
Check continuity of filament
terminal of high voltage
transformer
0V
Check D.C. voltage being
supplied to RELAY (RY1) coil
Defective touch
control circuit
Approx
15 VDC
20
Faulty
contacts or
RELAY (RY1)
or open
relay coil
Replace
Replace
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit
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 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 “ :0” when the 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 close, replace P.C.B assembly.
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 the control circuit board
Replace the
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 failure of membrane keyboard, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B.
assembly.
21
MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water
exposed to the microwave as directed below.
PROCEDURE
1. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external
diameter of approximately 190mm and a height of approximately 90mm.
The mass of the container is determined.
2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial temperature of 10˚C ± 1˚C is used for the test. The water temperature is measured immediately before it is poured into
the container.
3. A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained.
The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position.
The oven is operated and the time for the water temperature to attain 20˚C ± 2˚C is measured. The oven is
then switched off and the final water temperature is
measured within 60s.
NOTE 1 - The water stirred is before its temperature is
measured.
NOTE 2 - Stirring and measuring devices are to have a
low heat capacity.
4. The microwave power output is calculated from the formula
P = {4,187 • mw(T2-T1) + 0.55 • mc (T2-T0)}/t
where
P is the microwave power output, in watts ;
mw is the mass of the water, in grams ;
mc is the mass of the container, in grams ;
T0 is ambient temperature, in degrees Celsius ;
T1 is the initial temperature of the water, in degree Celsius ;
T2 is the final temperature of the water, in degrees Celsius ;
t
is the heating time, in seconds, excluding the magnetron filament heating-up time.
✻ The microwave power output is stated in watts, rounded off to the nearest 50W
CAUTION
1. Water load should be measured exactly to 1 liter.
2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS).
3. Ambient temperature should be 20 ± 2°C (68 ± 3.6°F)
✻ Heating time for power output: (T2 = T0)
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
22
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/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 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.
23
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. 130.5 Ω±10%
Filament winding.....................................Approx. 0Ω
Primary winding ..............................Approx. 1.371 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 10MΩonce the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10MΩ.
(5) Resistance between each terminal and chassis should be infinite.
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 KΩin 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 0.1Ωor 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 operation 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.
24
WIRING DIAGRAM
25
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
LOAD
NO LOAD
6-7, 7-8
DC 12V
AC 26.0V
9-10
AC 3.4V
AC 4.0V
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
NO
CHECK POINT
1
IC1 PIN 63, 64
2
IC1 PIN 38
REMARK
5VDC
5V
0V
3
T
T:20ms(50Hz)
T
T:250ns(4MHz)
IC1 PIN 33 OR 34
5V
0V
• Check method
NO
MEASURE POINT
WAVE FORM
REMEDY
REMARK
1
MP1
DC 5V±0.25V
Replace Q9, ZD2, EC2, R21, C3
NO LOAD
2
MP2
DC 12V±2.0V
Replace D12, D13, EC4, EC5, R22,C7
NO LOAD
NOTE :
Each measure point must be measured with GND points.
26
MP1
MP2
Measure Point
27
3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor do not rotate, but cook indicator in display comes on.
* Cause : RELAY 2 does not operate. → refer to Circuit Diagram (Point 3)
- Check method
POINT
A
B
RELAY 2 ON
2.5VDC
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.
* Cause : RELAY 1 does not operate. → refer to Circuit Diagram (Point 2)
- 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.
→ refer to Circuit Diagram (Point 1)
-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 5)
POINT
1
WAVE FORM
0V
-5V
T
T:20ms(50Hz)
* If clock does not keep exact time, you must check resistor R16, R23, transistor Q5.
28
Replace door open monitor
switch.
DMR-1P5FS
2. PCB CIRCUIT DIAGRAM
29
3. PCB LOCATION NO.
NO
NAME
SYMBOL
SPECIFICATION
PART CODE
Q’TY
1
BUZZER
BZ1
BM-20K (BUJEON)
3515600100
1
2
C CERA
C1~9
HIKF 50V 0.1MF Z AXIAL
CCZF1H104Z
9
3
C ELECTRO
EC1
50V RS 0.1MF (5X11) TP
CEXE1H108A
1
4
C ELECTRO
EC2
50V RS 10MF (5X11) TP
CEXE1H100A
1
5
C ELECTRO
EC3
50V RS 2.2MF (5X11) TP
CEXE1H229A
1
6
C ELECTRO
EC4
35V RSS 220MF (10X12.5)TP
CEXF1V221V
1
7
C ELECTRO
EC5
35V RSS 1000MF (13X25) TP
CEXF1V102V
1
8
C ELECTRO
EC6
50V RSS 100MF (8X11.5) TP
CEXF1H101V
1
9
C ELECTRO
EC7
50V RSS 220MF (10X16) TP
CEXF1H221V
1
10
CONN FILM
CN2
FCZ 254-12
441M367170
1
11
CONN WAFER
CN1
YW396-02V(YEONHO)
3519150520
1
12
CONN WAFER
CN3
YW396-07AV(YEONHO)
3519150540
1
13
DIGITRON
DP1
HNM-07MS12
DHNM07MS12
1
14
DIODE
D1~7,9~11
1N4148 AUTO 52MM
DZN4148---
10
15
DIODE
D12~15
KN4004A AUTO 52MM
DZN4004A--
4
16
DIODE ZENER
ZD1
UZ-3.9BSB(3.92-4.14)
DZUZ3R9BSB
1
17
DIODE ZENER
ZD2,4
UZ-5.6BSB(5.46-5.70V)
DZUZ5R6BSB
2
18
DIODE ZENER
ZD3
UZ-24BSB(22.75-23.73V)
DZUZ24BSB-
1
19
HOLDER VFD
DPH
NYLON 66
3513001400
1
20
IC EEPROM
IC2
CAT24WC02
14HN24WC02
1
21
IC MICOM
IC1
TMP87CM14N-6CG3
13GS1P5C01
1
22
PCB MAIN
BOARD
M318
3514328510
1
23
R ARRAY
RA2
RGLD4X104J (MURATA)
RA-85X104J
1
24
R ARRAY
RA3
6P(5) 1/8 100K OHM J
RA-86X104J
1
25
R CARBON FILM
R1,2,5,11,16
1/6 10K OHM J
RD-AZ103J-
5
26
R CARBON FILM
R14
1/6 4.7K OHM J
RD-AZ472J-
1
27
R CARBON FILM
R17
1/6 100 OHM J
RD-AZ101J-
1
28
R CARBON FILM
R18,23
1/6 47K OHM J
RD-AZ473J-
2
29
R CARBON FILM
R22,24
1/2 27 OHM J SMALL
RD-2Z270JS
2
30
R CARBON FILM
R25
1/4 6.8 OHM J
RD-4Z689J-
1
31
R CARBON FILM
R3
1/6 1M OHM J
RD-AZ105J-
1
32
R CARBON FILM
R4,6,7,9,10,12,13,15,19~21
1/6 1K OHM J
RD-AZ102J-
11
33
R CARBON FILM
R8
1/6 200 OHM J
RD-AZ201J-
1
34
RESONATOR CERA
CR1
CRT 4.00MS
5P4R00MTS-
1
35
SW RELAY
RY1
G5G-1A 1C 1P DC12V
5SC0101121
1
36
SW RELAY
RY2,3
OJ-SS-112LM 1C 1P
5SC0101404
2
37
TR
Q1,6
KTA1266Y- (2SA1980NYATPF)
TZTA1266Y-
2
38
TR
Q3~5
KRC106M(AUTO)
TZRC106M--
3
39
TR
Q7~9
KTC3198GR (1815GR)
TZTC3198GR
3
40
TRANS POWER
LVT1
DMR-1P5FS
5EPV035410
1
41
WIRE COPPER
J1~3,5,8
1/0.52 TIN COATING
85801052GY
5
42
WIRE COPPER
J4
1/0.52 TIN COATING
85801052GY
1
43
WIRE COPPER
J6,7,9~13
1/0.52 TIN COATING
85801052GY
7
30
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly.
3. GUIDE WIND ASSEMBLY
Refer to Disassembly and assembly.
4. TOTAL ASSEMBLY
F01
F19
F20 F02
F46
F45
F51
F03
F50
F43
F04
F46
F44
F05
F41
F40
F06
F07
F35
F39
F09
F38
F42
F49
F47
F36
F24
F48
F18
F37
F27
F34
F17
F11
F13
F14
A00
F16
F12
B00
F15
F10
F08
F28
F29 F22 F31 F21
F30 F33
31
F32 F26 F23 F25
REF. NO
PART CODE
PART NAME
A00
B00
F01
F02
F03
F04
F05
F06
F07
F08
F09
F10
F11
F12
F13
F14
F15
F16
F17
F18
F19
F20
F21
F22
F23
F24
F25
F26
F27
F28
F29
F30
F31
F32
F33
F34
F35
F36
F37
F38
F39
F40
F41
F42
F43
F44
F45
F46
F47
F48
F49
F50
F51
3511731000
PKCPSWZZ12
3516121900
3966031300
7121400611
3517101600
3517402400
3511410100
4414H50000
3511410000
3517213100
3512784900
3513816000
3513700800
3513702100
5S762G10G0
3518571000
4415A66910
3513601600
7122401211
3518906510
7121400611
3510319800
3512101400
3518303720
441X304112
3518401410
3518701610
7S432X4081
3515202800
7272400811
3517304600
7S312X40A1
3518121760
3516003700
3518003810
7S627W50X1
3518903900
7121300611
3512515300
3963514380
7121403011
3518605500
3511800100
3511409500
7122401211
3511345QM5
7122401011
7122401211
7122400811
7272400811
3510810620
7S312X40A1
DOOR AS
CONTROL-PANEL AS
CAVITY AS
MOTOR SYNCRO
SCREW TAPPING
STIRRER BLADE
COUPLER STIRRER
COVER STIRRER
FIXTURE AS
COVER HOLE *I
TRAY AS
HARNESS MAIN
LOCK
LEVER LOCK
LEVER SW MICRO
SW MICRO
SWITCH PUSH
SW MICRO
LAMP
SCREW TAPPING
THERMOSTAT
SCREW TAPPING
BASE
FOOT
CAPACITOR HV
HOLDER HV CAPACITOR
DIODE HV AS
FUSE HV
SPECIAL SCREW
STOPPER HINGE *U AS
SCREW TAPTITE
FOAM
SCREW SPECIAL
TRANS HV
SPECIAL SCREW
MAGNETRON
NUT HEX
THERMOSTAT
SCREW TAPPING
GUIDE WIND
MOTOR SHADED POLE
SCREW TAPPING
NOISE-FILTER
FAN
COVER HOLE *O
SCREW TAPPING
CORD POWER AS
SCREW TAPPING
SCREW TAPPING
SCREW TAPPING
SCREW TAPTITE
CABINET
SCREW SPECIAL
DESCRIPTION
KOM-9P2CBS
KOM-9P2CBS
KOM-9P0C9S
SM16F -HK36T1FY
T2S PAN 4X6 MFZN
AL050-H18 T0.7
PPS
PP
KOG-36150S
PP
KOM-9P0C9S TRAY CEILING
KOM-9P0C9S
PP
POM
POM,KOG-846T0S
SZM-V16-FD-63 S (200G)
V0303A2 / MP101C
VP-531A-OF/SZM-V16-FA-61
BL 240V 25W T25 C7A H187
T2S TRS 4*12 MFZN
OFF:85 ON:50 H #187
T2S PAN 4X6 MFZN
SBHG T0.8
DASF-310
2300V 1.15UF #187 CLASS P 85MM
SECC 0.8T
HV03-12 400MA 12000V #187
5KV 1A
TT3 TRS 4X8 SE MFZN
KOR-121M0A
TT3 TRS 4X8 MFZN
CR 6TX220X30
T1 TRS 4X10 SE MFZN
R9S59A DS30
TT3 HEX 4X8 FLG MFZN
2M248H(DW)-B
NUT FLANGE M5X0.8P MFZN
OFF:160 ON:115 H #187
T2S PAN 3X6 MFZN
PP
230V 50HZ OEM-15DWC2-C03
T2S PAN 4X30 MFZN
DWLF-M07
P.P GF20
SBHG T0.8
T2S TRS 4*12 MFZN
3X1.0 80X80 120-RTML RUBBER(UK)
T2S TRS 4*10 MFZN
T2S TRS 4*12 MFZN
T2S TRS 4*8 MFZN
TT3 TRS 4X8 MFZN
STS 430 NO4 T0.5
T1 TRS 4X10 SE MFZN
32
Q'TY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
1
1
1
4
1
1
1
1
1
1
1
1
6
1
4
1
4
1
2
1
1
2
1
1
1
1
1
1
1
1
3
1
4
DAEWOO ELECTRONICS CORP.
1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
S/M NO. : OM9P2CBS001
PRINTED DATE: May. 2012
ABOUT THIS MANUAL
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