Daewoo KOM-9F2CTS, KOM-9F2CKS Service Manual

Service Manual

Microwave Oven

Model: KOM-9F2CTS

KOM-9F2CKS

S/M No. :

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).

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

microwave source, and make repairs if necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches (5) Evidence of dropping or abuse.

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 ............................................................................................................17

TROUBLESHOOTING GUIDE..........................................................................................................................................18

MEASUREMENT AND TEST............................................................................................................................................23

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT .................................................................................23

2. MICROWAVE RADIATION TEST............................................................................................................................24

3. COMPONENT TEST PROCEDURE........................................................................................................................25

WIRING DIAGRAM ..........................................................................................................................................................26

PRINTED CIRCUIT BOARD ............................................................................................................................................28

1. CIRCUIT CHECK PROCEDURE ............................................................................................................................28

2. P.C.B. CIRCUIT DIAGRAM .....................................................................................................................................33

3. P.C.B. LOCATION NO ............................................................................................................................................34

EXPLODED VIEW AND PARTS LIST..............................................................................................................................35

1. DOOR ASSEMBLY..................................................................................................................................................35

2. CONTROL PANEL ASSEMBLY...............................................................................................................................35

3. TOTAL ASSEMBLY .................................................................................................................................................35

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 by-pass. 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 have excessive emission level 5mW/cm

, the service man 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 the dealer 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.

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.

SPECIFICATIONS

MODEL POWER SUPPLY

POWER CONSUMPTION

MICROWAVE OUTPUT POWER

FREQUENCY OUTSIDE DIMENSIONS (W X H X D) CAVITY DIMENSIONS (W X H X D) CAVITY VOLUME NET. WEIGHT TIMER POWER SELECTIONS

240V AC 50Hz SINGLE PHASE WITH EARTHING

465 X 370 X 599 mm ( 18.31 X 14.57 X 23.58 in.)

371 X 198.5 X 372 mm ( 14.61 X 7.81 X 14.66 in.)

0.9 cu.ft

60 min.

5 LEVELS

KOM-9F2CTS

3000W 1850W

2450Mhz

APPROX. 34kg(75.1lbs)

KOM-9F2CKS

2600W 1500W

2450Mhz

APPROX. 32.5kg(71.7lbs)

EXTERNAL VIEW

1. OUTER DIMENSION

465 599

370

2. FEATURE DIAGRAM

6 7

Safety Interlock System.

Door Viewing Screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

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.

Oven Cavity.

Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.

Plate Tray - Made of special heat resistant material. Food in a proper receptacle is placed on this plate for cooking.

Ceiling Cover - This is located on top side of the oven.

3. CONTROL PANEL

123 4 6 7 8 9 05

MICROWAVE indicator It will turn on when the magnetron output actually is on.

Double Quantity indicator It will turn on when DOUBLE QUANTITY pad is pressed.

STAGE indicator It will blink the ongoing stage number of its all cooking stages.

CLEAN FILTER indicator It will turn on during clean filter message displaying.

POWER LEVEL indicator It will turn on when POWER LEVEL pad is pressed except full power.

POWER LEVEL pad POWER LEVEL pad is used to set a variable power level.

Number pads Number pads are used to set the manual cooking time. It is also used to start preprogrammed cooking cycle.

DOUBLE QUANTITY pad X2 pad increases a preprogrammed cooking time by a percentage of the original cooking time. The user specifies the percentage and it can be changed for individual cooking sequences. This feature is very useful for cooking multiple servings of foods.

STOP pad STOP pad stops a cooking sequence in progress, clears out any remaining time, and also ends programming or user option cycle. When STOP pad is used to end a programming or option change, the changes are discarded.

START/ 20sec.+ pad START pad is used to begin a manual cooking cycle. It is also used to save any changes to programming sequences or user options. START pad can be used as speedy cooking pad. In ready mode, 20sec.+ pad allows you to reheat for 20 seconds at full power by pressing it. By repeatedly touching 20sec.+ pad, you can also extend reheating time to 5 minutes by 20 second increments.

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 clear. If all vents are covered during operation, the oven may be overheated and,

eventually, cause oven failure.

3. Away fr om 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 fr om heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be

adversely affected and breakdowns occur.

5. Power supply

• Check your local power source. This microwave oven requires a current of approximately 13 amperes, 240Volts,50Hz.

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 earthing 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 f or 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.

OPERATIONS AND FUNCTIONS

1. Connect the mains lead to an electrical outlet.

2. Open the oven door once to use the oven. The display lights up and the oven is ready to work.

3. After placing the food in a suitable container, open the oven door and put it in the cavity.

4. Close the door firmly.

5. The oven could be stopped at any time during operation by opening the oven door. To restart the oven, close the door and then touch START pad.

6. Each time pad is touched, a BEEP will sound.

7. When STOP pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information, touch STOP pad once more. If the oven door is opened during the oven operation, all information is retained.

8. If the START pad is touched and the oven does not operate, check the area between the door and door is closed firmly. The oven will not start cooking until the door is completely closed or the program has been reset.

Wattage output chart

The power level is set by touching the Power Level pad. The chart shows the display, the power level and the percentage of power.

Make sure the oven is properly installed and plugged into the electrical outlet.

Once HI 100%

Twice 70% 70% 3 times 50% 50% 4 times 20% 20% 5 times 0% 0%

Power Level Pad Power level (Display) Approximate Percentage of Power

Cautions to be observed when troubleshooting.

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully.

1. Always remove the power plug from the outlet before servicing.

2. Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side.

3. Discharge the high voltage capacitor before touching any oven components or wiring.

(1) Check the earthed.

Do not operate on a 2-wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to make sure it is earthed properly before beginning repair work.

(2) Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation stopped and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor, by using a properly insulated screwdriver to discharge.

4. When the 12A fuse is blown out due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch.

5. After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened.

6. Do not operate without cabinet.

DISASSEMBLY AND ASSEMBLY

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.

SHORT

1. T o remo ve cabinet

1) Remove thirteen screws on cabinet.

2) Pull the cabinet backward.

2. T o remo ve control panel assembly

1) Remove three screws which secure the front plate.

2) Remove the control panel assembly from front plate of

cavity.

3) Reverse the above for reassembly.

3. T o remo ve door assemb l y

1) Open the door ssembly and lift the door assembly.

2) Reverse the above for reassembly.

NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.

4. T o remo ve contr ol panel parts.

B01

B02 B03

1) Remove three screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.

2) Remove three screws which secure the PCB assembly to control panel.

3) Reverse the above steps for reassembly.

B01 3516742100 CONTROL-PANEL ABS SG-175, SG-0760D 1 B02 3514333500 PCB SUB AS KOM-9F0CTS 1 B03 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 3

REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK

C/PANEL ASSEMBLY : PKCPSWZYD0

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Daewoo KOM-9F2CTS, KOM-9F2CKS Service Manual

Specifications and Main Features

Frequently Asked Questions

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