Daewoo KOM-9P2CBS Service Manual
Service Manual
Microwave Oven
Model: KOM-9P2CBS
S/M No. : OM9P2CBS001
May. 2012
✔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).
1
PRECA UTIONS T O BE OBSERVED BEFORE AND
DURING SER VICING T O AVOID POSSIBLE
EXPOSURE T O EXCESSIVE MICROW AVE 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 micro-
wave 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 gen-
erating 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 per-
formed 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
2
SAFETY AND PRECA UTIONS
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 PR OCEDURES
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
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.
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.
3
SPECIFICATIONS
POWER SUPPLY 240V AC, 50Hz SINGLE PHASE WITH GROUNDING
INPUT POWER 1600 W
MICROWAVE ENERGY OUTPUT 1100 W
FREQUENCY 2,450MHz
OUTSIDE DIMENSIONS (W H D) 542 x 329 x 461 mm
CAVITY DIMENSIONS (W H D) 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.
4
1. OUTER DIMENSION
EXTERNAL VIEW
542 461
329
5
35
26
4781
11
Safety Interlock System.
22
Door Viewing Screen - Allows viewing of food.
The screen is designed so that light can pass
through, but not the microwave.
33
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.
44
Oven Cavity.
55
Door Seal - Door seal maintains the
microwave energy within the oven cavity and
prevents microwave leakage.
66
Plate Tray - Made of special heat resistant
GLASS. Food in a proper receptacle is placed
on this plate for cooking.
77
Stirrer Cover - This is located on the ceiling
with the stirrer fan.
88
Inlet cover - Protect the air hole from splashes
of cooking foods.
2. FEATURES DIAGRAM
6
3
4
1
2
5
6
8
9
0
q
w
7
11
MICROWAVE indicator, showing microwaving
in progress.
22
DEFROST indicator, showing defrosting in
progress.
33
PERCENTAGE of power indicator.
44
CHILD LOCK indicator.
55
PROGRAM - Used to save cooking data.
66
DEFROST - Used to defrost foods for time.
77
TIME SET PAD - Used to set the cooking time.
88
CHECK - Used to check cooking data.
99
DOUBLE QUANTITY - Used to extend programmed cooking time.
00
POWER - Used to set power level.
qq
STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
ww
START /+30SEC - Used to start the oven and
also used to set a reheat time.
3. CONTROL PANEL
7
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.
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.
INSTALLATION
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.
EARTHING INSTRUCTIONS
8
Make sure the oven is properly installed and plugged into the electrical.
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.
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.
once 100 100%
twice 80 80%
3 times 60 60%
4 times 40 40%
5 times 20 20%
Touch POWER pad. Power Level (Display) Approximate Percentage of Power
9
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.
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.
SHORT
10
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.
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