Daewoo KOT-150S0A, KOT-151S0A, KOT-152U0A, KOT-152C0A, KOT-155S0A Service Manual

Service Manual

Microwave Oven

Model: KOT-150S0A

KOT-151S0A

KOT-152U0A

KOT-152C0A

KOT-155S0A

DAEWOO ELECTRONICS CO., LTD.

S/M No. : T150S0A003

http : //svc.dwe.co .kr Feb. 2002

-MAKING ADJUSTMENTS

Refer to FIG. 7-1 for the following steps:

1. If necessary, adjust the interlock switch housing so that the switches operate properly.

2. Mount the control panel to the oven with the screw you removed earlier.

3. Mount the vent grille to the microwave oven and check out the operation of the switches.

W ARNING :

The interlock Monitor Switch provides an added safety check on the Primary and Secondary Interlock Switches. If the Primary and Secondary Interlock Switches allow the oven to operate with the door open, the Monitor Interlock Switch will blow the line fuse.

NOTE :

Interlock switch replacement Whenever safty interlock switches are replaced: Refer to the following diagram. Check the connection of monitor switch after replacement. Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.

FIG. 7-1

8. REPLACING THE THERMOSTAT (BOTTOM/VENT)

1. Disconnect the electric supply to the microwave oven.

2. Remove the vent grille and the cabinet from the microwave oven (See cabinet removal on FIG. 1).

3. Remove the wire protector(see Fig. 4).

4. Remove the screw from the top center tab of the control panel. (See FIG. 2).

5. From the top and back of the control panel, lift the top locking tab and pull the top of the panel out slightly, then lift bottom tabs of the panel out of the slots and pull it forward. Set the panel inside the oven cavity while you work.

Refer to FIG. 8 and the inset for the following steps:

6. Remove the mounting screw from the bottom thermostat and lift the bottom flange out at slot in the chassis (See FIG. 8)

7. Unplug the two wire connectors from the bottom thermostat.

8. Connect the two wires to the new bottom thermostat.

9. Insert the bottom tab of the bottom thermostat into the chassis slot, and secure the thermostat with its mounting screw.

10. Mount the Control panel to the oven and screw it with its mounting screw.

11. Mount the vent grille to the microwave oven and check out the operation.

* Vent thermostat is same as bottom thermostat method. (See FIG. 8-2)

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

FIG. 8

9. REPLACING THE TRAY MOTOR

1. Remove 4 screws from the base plate and remove it. Refer to the FIG. 9 for the following steps:

2. Pull the connectors off the tray motor terminal.

3. Remove the screws from the tray motor and remove the motor.

4. Install the coupler onto the new tray motor shaft.

5. Mount the new motor to the oven with its the screws.

6. Connect the wires to the tray motor terminal.

7. Reinstall the base plate in the oven.

8. Secure its 4 screws.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

FIG. 9

10. REPLACING A COOKTOP LIGHT SOCKET

1. Pull the connectors off the cook-top light socket terminals set the base plate aside.

2. Remove the screw for the cook-top light socket and remove it.

3. Mount the new light socket into the holder.

4. Reattatch the connectors with the orange and brown wires over the light socket terminals.

5. Mount the base plate to the microwave oven.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

FIG. 10

11. REPLACING THE DOOR ASSEMBLY

Refer to FIG. 11 for the following steps:

1. Remove the Grille.

2. Open the door and lift the door.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

FIG. 11

12. REPLACING THE GASKET

Refer to FIG. 12 for the following steps:

1. Open the oven door.

2. Pry out the gasket along the edges of the door with a putty knife.

3. Install the new gasket so that it fits tightly into place inside the door.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

FIG. 12

13. REPLACING

-THE CAVITY THERMOSTAT

1. Remove the microwave oven from the microwave oven location.

2. Remove the vent grille and cabinet from the microwave oven. (See the cabinet removal)

3. Remove the 2 screws for supporter from the microwave oven.

4. Remove the power cord (see the replacing the powercord, Fig. 16)

5. Remove 4 screws for the vent motor and air guide top.

6. Remove the vent motor and lift the air guide top. (See FIG. 13-1)

7. Unplug and replace the two wire connectors from the cavity thermostat. (See FIG. 13-2)

8. Install the new cavity thermostat and reinstall the air guide top, vent motor, cabinet and vent grille on the microwave oven.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury. Discharge the high voltage capacitor before working inside the oven. Failure to do so could result in electrical shock.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result personal injury.

FIG. 13

FIG. 13-1

FIG. 13-2

14. REPLACING THE VENTILATION MOTOR

1. Remove the microwave oven from the microwave oven location.

2. Remove 2 screws for the vent motor cover and remove it. (See cabinet removal).

3. Remove the screws for the vent motor and lift the vent motor. (See FIG. 14).

4. Unplug the wire connectors for vent motor.

5. Install the new vent motor and secure the vent motor.

6. Connect the wire connector and secure the vent motor.

7. Mount the control panel to the oven and secure it with its mounting screw.

8. Refer to Cabinet Installation and reinstall the base plate and the vent grille on the micrewave oven.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

FIG. 14

15. REPLACING THE FAN MOT OR

1. Remove the microwave oven from its mounting location.

2. Remove the vent grille, the wire protector and the cabinet from the microwave oven (See Cabinet Removal).

3. Remove the screw from the top center tab of the control panel. Refer to the inset and perform the following steps:

4. Unplug the fan motor wire connectors from the motor terminals, and remove the fan motor assembly.

5. Pull the fan blade and compression washer off the shaft of the defective fan motor.

6. Remove the two motor mounting screws from the fan motor and remove it.

7. Mount the new fan motor to the fan motor housing with the two mounting screws.

8. Slide the fan blade.

9. Connect the fan motor wires to the fan motor terminals.

– Reassembly

1. Connect the wiring to the control panel circuit board, and then mount the control panel to the oven with its mounting screw.

2. Refer to Cabinet Installation, and reinstall the cabinet and the vent grille on the microwave oven with its mounting screw.

3. Reinstall the microwave oven in its mounting location.

FIG. 15

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

16. REPLACING THE POWER CORD

1. Remove the microwave oven from its mounting location.

2. Remove the vent grille, the wire protector and the cabinet from the microwave oven (See “Cabinet Removal). Refer to FIG. 16 and the inset for the following steps:

3. Unplug the black and white power cord leads.

4. Remove the ground screw from the green power cord lead.

5. Remove the old power cord.

6. Raise the cover just enough to slide the new power cord strain relief block into the chassis slot.

7. Connect the power cord lead to the wiring harness connector so the sections lock together.

8. Route the green wire under the cover, and mount the eyelet to the chassis with the screw you removed earlier.

9. Refer to “Cabinet Installation” and reinstall the cabinet and the vent grille on the microwave oven.

10. Reinstall the microwave oven in its mounting location.

FIG. 16

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Heazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

NOTE :

Disconnect the black lead by pressing in on the locking arm of the connector and pulling it loose.

17. REPLACING THE HIGH-VOLTAGE TRANSFORMER

1. Remove the vent grille, the wire protector and the base plate from the microwave oven (See FIG. 1,2).

2. Remove the control panel so that you can access the high-voltage section in the microwave oven(See FIG.1).

FIG. 17

W ARNING :

Personal Injury Hazard Disconect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

NOTE :

Personal Injury Hazard Disconnect from the power supply, before servicing. Discharge the capacitor using a 20,000 W discharge resistor, or an insulated plastic-handle screwdriver to short across the capacitor terminals.

3. Discharge the high-voltage capacitor.

4. Remove 4 screws from the H.V. Transformer and save the screws. Refer to FIG. 17-1 for the following steps:

5. Unplug the five high-voltage transformer wire connectors and remove high voltage transformer.

6. Mount the new high-voltage transformer to the plate with 4 mounting screws you removed earlier.

7. Connect 5 wire connectors going to the high-voltage capacitor, the high-voltage transformer, and the magentron as shown in FIG.17-1.

FIG. 17-1

18. REPLACING THE HIGH VOLTAGE RECTIFIER

1. Remove the vent grille, the wire protector and the control panel from the microwave oven (See FIG.1, FIG.2).

2. You can access the high-voltage section in the microwave oven.

3. Discharge the high-voltage capacitor.

4. Unplug one end of the high-voltage rectifier from the high-voltage capacitor terminal.

5. Remove a screw from the end of the high-voltage rectifier, and remove the high voltage rectifier.

6. Mount the eyelet on the end of the high-voltage rectifier lead to the bracket with its mounting screw.

FIG. 18

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

W ARNING :

19. REPLACING THE HIGH VOLTAGE CAPACITOR

1. Remove the vent grille(See FIG.1, FIG2).

2. Remove the wire protector.

3. Remove the control panel so that you can access the high-voltage section in the microwave oven. (See FIG. 1)

4. Discharge the high-voltage capacitor.

5. Unplug the wire connector going to high voltage transformer and one end of high voltage rectifier.

6. Remove the capacitor mounting strap screw, the remove the old capacitor.

W ARNING :

Personal Injury Hazard Disconnect from the electrical supply before servicing the unit. Failure to do so could result in electrical shock or other personal injury.

CAUTION :

Personal Injury Hazard Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

W ARNING :

Personal lnjury Hazard Disconnect from the power supply, before servicing. Discharge the capacitor using a 20,000 W discharge resistor, or an insulated plastic-handle screwdriver to short across the capacitor terminals.

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