Daewoo KOR-868G7S, KOR-868G Service Manual

Service Manual

Microwave Oven

Model: KOR-868G7S

DAEWOO ELECTRONICS CORP.

S/M No. : R868G7S001

http : //svc.dwe.co.kr Jun. 2003

✔ 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).

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWA VE 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.

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.

T ABLE OF CONTENTS

SAFETY AND PRECAUTIONS

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1. FOR SAFE OPERATION

..................................................................................................................................

2. FOR SAFE SERVICE PROCEDURES

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SPECIFICATIONS

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EXTERNAL VIEW

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1. OUTER DIMENSION

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2. FEATURE DIAGRAM

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3. CONTROL PANEL

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INSTALLATION

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OPERATIONS AND FUNCTIONS

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DISASSEMBLY AND ASSEMBLY

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INTERLOCK MECHANISM AND ADJUSTMENT

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TROUBLE SHOOTING GUIDE

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MEASUREMENT AND TEST

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1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................21

2. MICROWAVE RADIATION TEST

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3. COMPONENT TEST PROCEDURE

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WIRING DIAGRAM

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PRINTED CIRCUIT BOARD

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1. CIRCUIT CHECK PROCEDURE

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2. PCB CIRCUIT DIAGRAM

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3. P.C.B. LOCATION NO

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EXPLODED VIEW AND PARTS LIST

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1. DOOR ASSEMBLY

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2. CONTROL PANEL ASSEMBLY

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3. TOTAL ASSEMBLY

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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.

(a) inform the manufacturer, importer or assembler,

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

(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.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Each Blue : Neutral Brown : Live

As the colours of the wires in the manins 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.

NOTE

This oven is designed for counter-top use only.

MODEL KOR-868G7S POWER SUPPLY 230V-50Hz, SINGLE PHASE WITH EARTHING

POWER

MICROWAVE 1350W

CONSUMPTION

GRILL

COMBINATION MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 495 x 294 x 384 mm (19.5 x 11.6 x 15.1 in) CAVITY DIMENSIONS (W X H X D) 320 x 237 x 343 mm (12.6 x 9.3 x 13.5 in) NET WEIGHT APPROX. 13.5 kg (29.7 lbs) TIMER 59 min. 99 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0.9 Cu. Ft.

* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

SPECIFICATIONS

EXTERNAL VIEW

1. OUTER DIMENSION

DOOR SEAL

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

DOOR HOOK

When the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

DOOR SCREEN

Allows viewing of food. Microwave cannot pass through perforations in screen.

SPATTER SHIELD

Protects the microwave outlet from splashes of cooking foods.

OVEN LAMP

Automatically turns on during oven operating.

SAFETY INTERLOCK SYSTEM

CONTROL PANEL

GLASS COOKING TRAY

Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.

OVEN FRONT PLATE

DOOR OPENING BUTTON

To open the door push the door opening button. When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

ROLLER GUIDE

Supports the glass cooking tray.

2. FEATURE DIAGRAM

1 Display

Cooking time, power level, present time are displayed.

2 Auto Cook

Used to cook using a program or to reheat.

3 Auto defrost

Used to defrost foods (by weight)

4 Power

Used to set power level.

5 Defrost

Used to defrost foods.(by time)

6 Clock

Used to set clock.

7 Time set pad

Used to set the cooking time and the present time.

8 Reheat Meal

Used to reheat meal or dinner plate.

9 Stop/Clear

Used to stop the oven operation or to delete the cooking data.

0 Start/Speedy Cook

Used to start a selected operation and also increase the reheat time by 30 seconds.

3. CONTROL PANEL

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 12 amperes, 230 Volts, 50 Hz.

• Power supply cord is about 0.8 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.

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 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 plut, 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.

OPERATIONS AND FUNCTIONS

Wattage output chart

The power-level is set by pressing the POWER pad. The chart shows the display, the power level and the percentage of power.

This section includes useful information about oven operation.

1. Plug power supply cord into a 230V 50Hz power outlet.

2. 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.

3. Shut the door. Make sure that it is firmly closed.

Touch Power pad Power level(Display) Approximate Percentage of Power

once P-HI 100%

twice P-90 90% 3 times P-80 80% 4 times P-70 70% 5 times P-60 60% 6 times P-50 50% 7 times P-40 40% 8 times P-30 30% 9 times P-20 20%

10 times P-10 10% 11 times P-00 0%

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

When the oven door is opened, the turns off.

The oven door can be opened at any time during operation by touching the door release button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch START.

Each time a pad is touched, a BEEP will sound to acknowledge the touch.

The oven automatically cook on full power unless set to a lower power level.

The display will show ":0" when the oven is plugged in.

Time clock returns to the present time when the cooking time ends.

When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.

If the START pad is touched and the oven does not operate, check the area between the door and door seal for obstructions and make sure the door is closed securely. The oven will not start cooking until the door is completely closed or the program has been reset.

1 2

3 4 5 6 7

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 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 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.

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.

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