DAEWOO KOC-995T0S11 Service Manual

Service Manual

Microwave Oven

Model: KOC-995T0S KOC-995T0S11

DAEWOO ELECTRONICS CO., LTD.

S/M No. : C995T0S110

TABLE OF CONTENTS

SAFETY AND PRECAUTIONS........................................................................................................... 2

SPECIFICATIONS 3 EXTERNAL VIEW 4

1. OUTER DIMENSION..................................................................................................................... 4

2. FEATURE DIAGRAM.................................................................................................................... 5

INSTALLATION................................................................................................................................... 7

CONTROL PANEL .............................................................................................................................. 8

DISASSEMBLY AND ASSEMBLY...................................................................................................... 10

INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 20

TROUBLE SHOOTING GUIDE ........................................................................................................... 21

MEASUREMENT AND TEST.............................................................................................................. 27

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 27

2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH................................................. 28

3. MICROWAVE RADIATION TEST................................................................................................. 29

4. COMPONENT TEST PROCEDURE............................................................................................. 30

WIRING DIAGRAM.............................................................................................................................. 31

SCHEMATIC DIAGRAM...................................................................................................................... 32

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

PRINTED WIRING BOARD................................................................................................................. 41

P.C.B. CIRCUIT DIAGRAM................................................................................................................. 46

(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.

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.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

SAFETY AND PRECAUTIONS

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.

(1) inform the manufacturer, importer or assembler,

(2) repair the unit at no cost to the owner,

(3) attempt to ascertain the cause of the excessive leakage,

(4) 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 immediately.

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Earth

Blue : Neutral Brown : Live

As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows. The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter 'E' , earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter 'N' or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter 'L' or coloured red.

IMPORTANT

This oven is designed for counter-top use only.

NOTE

SPECIFICATIONS

* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

MODEL KOC-995T0S KOC-995T0S11

POWER SUPPLY 230V~50Hz 230V~50Hz

POWER CONSUMPTION

MICROWAVE 1,550W 1,550W GRILL 1,400W 1,400W CONVECTION 1,450W ( Temporary Maximum Power Consumption : 2,800W )

COMBINATION 2,950W (Simultaneous) 1,550W (Sequentional) MICROWAVE ENERGY OUTPUT 1,000W(IEC705) 1,000W(IEC705) MICROWAVE FREQUENCY 2,450MHz 2,450MHz OUTSIDE DIMENSIONS (W X H X D) 526 x 345 x 496 mm (20.7 x 13.6 x 19.1 in.) CAVITY DIMENSIONS (W X H X D) 335 x 260 x 335 mm (13.2 x 10.2 x 13.2 in.) NET WEIGHT APPROX. 23.0 Kg (50.8 lbs.) TIMER 60 minutes

FUNCTION SELECTIONS

MICROWAVE/GRILL/CONVECTION/COMBI/

ROTISSERIE(option) POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu.Ft.

EXTERNAL VIEW

1. OUTER DIMENSION

EXTERNAL VIEW

2. FEATURE DIAGRAM

2-1. KOC-995T0S

1. Door seal -

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

2. Door hook

When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the

magnetron will immediately stop operating.

3. Door viewing screen -

Allows viewing of food. The screen is designed so that light can pass through, but not the

microwave.

4. Top heater -

Turns on when convection, grill and combi cooking is selected.

5. Oven lamp

- Automatically turns on during oven operating.

6. Safety interlock system

7. Control panel

8. Turntable tray -

Rotates during cooking and ensure even distribution of Microwaves.

It can also be used as a cooking utensil.

9. Oven front plate

10. Rotating base -

This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all

cooking. It should only be removed for cleaning.

11. Metal rack

12. Convection outlet & Fan

EXTERNAL VIEW

2-2. KOC-995T0S11

1. Door seal -

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

2. Door hook -

When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the

magnetron will immediately stop operating.

3. Door viewing screen

Allows viewing of food. The screen is designed so that light can pass through, but not the

microwave.

4. Top heater

Turns on when convection, grill and combi cooking is selected.

5. Oven lamp

Automatically turns on during oven operating.

6. Safety interlock system

7. Control panel

8. Turntable tray -

Rotates during cooking and ensure even distribution of Microwaves.

It can also be used as a cooking utensil.

9. Oven front plate

10. Rotating base -

This fits over the shaft in the center of the ovens cavity floor.

This is to remain in the oven for all cooking. It should only be removed for cleaning.

11. Metal rack

12. Convection outlet & Fan

13. Guide Rotary

14. Motor Synchro

15. Utensil Bar

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 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 13amperes, 230 Volts, 50 Hz. Power supply cord is about 1.2 meters long. The voltage used 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 wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

EARTHING INSTRUCTIONS

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman 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.

WARNING

CONTROL PANEL

1. KOC-995T0S

CONTROL PANEL

2. KOC-995T0S11

DISASSEMBLY AND ASSEMBLY

Cautions to be observed when trouble shooting.

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 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 earthed.

Do not operate on a two-wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to makes 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 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.

Service personnel should remove their watches whenever working close to or replacing the magnetron.

CAUTION

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.

WARNING

1. To remove cabinet

1) Remove four screws on cabinet back.

2) Push the cabinet backward.

2. To remove guide wind assembly

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.

DISASSEMBLY AND ASSEMBLY

3. To remove H.V.transformer

(1) Remove four screws which secure

the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly.

4. 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

DISASSEMBLY AND ASSEMBLY

5. To temove guide air assembly

1) Remove two screws holding guide air assembly to the oven cavity.

2) Remove a screw which secure the lamp to guide air assembly.

3) Remove lever damper to valve damper.

4) Remove a screw which secure the solenoid to guide air assembly.

5) Reverse the above steps for reassembly.

REF CO. PART CODE PART NAME DESCRIPTION QTY REMARK

1 3512508000 GUIDE AIR WELD AS KOC-961C0S 1 2 3515400200 VALVE DAMPER SBHG-1 T0.5 1 3 3517501000 PROTECTOR DAMPER SILICON RUBBER 1 4 3519000100 SOLENOID DC DET-SL-007 DC12V 1 5 7142400611 SCREW TAPPING

T2 TRS 456 MFZN

1 6 3513700300 LEVER DAMPER SUS 304 H DIA :0.8 1 7 3515101000 SPRING DAMPER HSWR 1 8 3513601000 LAMP BM 240V 25W T25 1 9 7112401011 SCREW TAPPING

T1 TRS 4510 MFZN

10 441Z724041 SHAFT DAMPER SWRM 1 11 7112401011 SCREW TAPPING

T1 TRS 4510 MFZN

12 441Q523060 FIXTURE SOLENOID SWC PI1.0 1

DISASSEMBLY AND ASSEMBLY

6. To remove convection part

1) Remove four screws holding guide air assembly to the oven cavity.

2) Remove a special screw to convection part.

3) Remove the fan convection.

4) Remove the pipe.

5) Remove three screws which hold the heater to convection part.

6) Remove the heater to convection part.

7) Remove the cover reflector to convection part.

8) Remove the insulator to the convection part.

9) Remove four screws which secure cover insulator to the bracket motor shaded.

10) Remove the cover insulator to the convection part.

11) Remove the fan to the convection part.

12) Remove two screws which secure the motor shaded pole to the bracket motor shaded.

13) Remove the screw which secure the thermostat to the bracket motor.

14) Reverse the above steps for reassembly.

REF CO. PART CODE PART NAME DESCRIPTION QTY REMARK

1 3963513700 MOTOR SHADED POLE 230V 50HZ OEM-10DWC2-C07 1 2 7S312X4081 SCREW TAPPING

T1 TRS 458 SE MFZN

4 3 3510601500 BRACKET MOTOR SHADED SBHG-1 T0.8 1 4 7051400811 SCREW MACHINE

PAN 458 SW MFZN

2 5 441B629071 FAN SA1D-80 T0.5 1 6 3511404000 COVER INSULATOR SA1D-80 T0.7 1 7 3513301600 INSULATOR *B CERAMIC BLANKET T0.6 1 8 3511404100 COVER REFLECTOR SA1D-80 T0.7 1 9 3514400410 PIPE A1100BR 1

10 3513002300 HOLDER HEATER SUS304 T0.5 3 11 7121400811 SCREW TAPPING

T2S PAN 458 MFZN

12 7S627W40X1 SPECIAL SCREW NUT FLANGE M4 MFZN 1 13 3511800400 FAN CONVECTION SA1D-80 T0.5 1 14 3512801800 HEATER 230V 1400W 1R18344 1 15 7112401011 SCREW TAPPING

T1 TRS 4510 MFZN

16 3518903800 THERMOSTAT OFF:160 ON:115 V#187 1 17 7121400811 SCREW TAPPING

T2S PAN 458 MFZN

7. To remove magnetron

1) Remove three screws which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

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.

WARNING

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DAEWOO KOC-995T0S11 Service Manual

Specifications and Main Features

Frequently Asked Questions

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