Daewoo KOR-975T0S05, KOR-975T0S, KOR-975T0S08 Service Manual

DAEWOO ELECTRONICS CO., LTD.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA

TELEX: DWELEC K28177-8

CABLE: “DAEWOOELEC” FAX: 02) 360-8184

TEL: 02) 360-8183

E-mail : G7F00E@web.dwe.co.kr

S/M NO. : R975T0S050

PRINTED DATE: Apr. 1999

Service Manual

Microwave Oven

Model: KOR-975T0S05

KOR-975T0S08

DAEWOO ELECTRONICS CO., LTD. http://svc.dwe.co.kr

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

TABLE OF CONTENTS
SAFETY AND PRECAUTIONS ...........................................................................................................................................	2
SPECIFICATIONS ...............................................................................................................................................................	3
EXTERNAL VIEW................................................................................................................................................................	3
1. OUTER DIMENSION..................................................................................................................................................	3
2. FEATURE DIAGRAM .................................................................................................................................................	4
INSTALLATION ...................................................................................................................................................................	5
EARTHING INSTRUCTIONS...............................................................................................................................................	5
CONTROL PANEL ..............................................................................................................................................................	6
DISASSEMBLY AND ASSEMBLY......................................................................................................................................	7
INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................	15
TROUBLE SHOOTING GUIDE .........................................................................................................................................	16
MEASUREMENT AND TEST ............................................................................................................................................	22
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT..................................................................................	22
2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH ............................................................................	23
3. MICROWAVE RADIATION TEST ............................................................................................................................	24
4. COMPONENT TEST PROCEDURE ........................................................................................................................	25
WIRING DIAGRAM............................................................................................................................................................	26
EXPLODED VIEWS AND PARTS LIST ............................................................................................................................	27
PRINTED WIRING BOARD ...............................................................................................................................................	29
P.C.B CIRCUIT DIAGRAM ................................................................................................................................................	33

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.

IMPORTANT

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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.

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@@	NOTE : This oven is designed for counter-top use only.	@@
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SPECIFICATIONS

MODEL		KOR-975T0S05/975T0S08

POWER SUPPLY		230V , 50Hz

	POWER CONSUMPTION	1,250 W

MICROWAVE	OUTPUT POWER	950 W (IEC 705)

	FREQUENCY	2,450 MHz

OUTSIDE DIMENSIONS (W X H X D)		526 X 345 X 425 mm (20.7 X 13.6 X16.7 inch)

CAVITY DIMENSIONS (W X H X D)		335 X 249 X 360 mm (13.2 X 9.8 X14.2 inch)

NET WEIGHT		Approx. 18.5 kg (40.8 Ibs.)

TIMER		60 minutes

FUNCTION SELECTIONS		MICROWAVE / DEFROST / MENU / ONE TOUCH

M/W POWER SELECTIONS		5 LEVELS

CAVITY VOLUME		1.0 Cu.Ft.

* Specifications are subject to change without notice.

EXTERNAL VIEW

1. OUTER DIMENSION

	DEFROST			MENU	PROGRAM
M/W WEIGHT			TIME	MENU	COOK
HI	MID-HI		MID	MID-LOW LOW
	NO			CUP	g
POWER		FROZEN			DINNER
POWER			PIZZA		PLATE
DEFROST		BEVERAGE			MUFFIN
	MENU				320	345
1.	Baked Potato
2.	Fresh Vegetable
3.	Soup
4.	Fish Fillets
5.	Meat Loaf
	WEIGHT
			KNOB
STOP				START
CLEAR				SPEEDY COOK
350						234
526						425

2. FEATURE DIAGRAM

34 56

M/W	DEFROST		PROGRAM
	WEIGHT TIME MENU		COOK
HI	MID-HI	MID MID-LOW LOW
	NO	CUP	g
POWER		FROZEN	DINNER
		PIZZA	PLATE
DEFROST		BEVERAGE	MUFFIN

2		MENU	7
	1.	Baked Potato	7
	2.	Fresh Vegetable
	3.	Soup
	4.	Fish Fillets
	5.	Meat Loaf
		WEIGHT
		KNOB
		STOP	START
	CLEAR		SPEEDY COOK
1	8

1Door seal—Door seal maintains the microwave ener - gy within the oven cavity and prevents microwave leakage.

2Door hook—When the door is closed, it will automati - cally shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.

3Door viewing screen—Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

4Spatter shield—Protects the microwave outlet from splashes of cooking foods.

5Oven lamp—Automatically turns on during oven oper - ating.

6Safety interlock system

7Control panel

8Oven front plate

9Glass 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.

0Roller guide—Supports the glass cooking tray.

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 6 amperes, 230V, 50Hz.

•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.

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 wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

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	WARNING
	Improper use of the earthing plug can result in a risk of electric shock.
	Consult a qualified electrician of 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.
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CONTROL PANEL

When blinking, the oven is operating in “TIME DEFROST” cooking mode.

When blinking, the oven is operating in “WEIGHT DEFROST” cooking mode.

When blinking, the oven is

DEFROST

PROGRAM

M/W

WEIGHT

TIME

COOK

operating in “MICROWAVE”

cooking mode.(5 STEPS)

— HI

— MID-HI

MID-HI

MID

MID-LOW

LOW

— MID

CUP

—MID-LOW

—LOW

FROZEN DINNER

POWER PIZZA PLATE

Microwave Power Level-

Used to select the variable

microwave power level.

DEFROST BEVERAGE MUFFIN

Program Cook Buttons

(ONE-TOUCH COOK)

1. Baked Potato

2. Fresh Vegetable

3. Soup

4. Fish Fillet

5. Meat Loaf

WEIGHT

Dial Knob-

Used to input the cooking time and weight.


	STOP	START
Stop/Clear Button-
Stop/Clear Button-
Used to pause and clear all	CLEAR	SPEEDY COOK
information manually put	CLEAR	SPEEDY COOK
into the oven.

When blinking, the oven is operating in “MENU” cooking mode.

When blinking, the oven is operating in “PROGRAM COOK” cooking mode.

(ONE-TOUCH COOK)

—FROZEN PIZZA

—DINNER PLATE

—BEVERAGE

—MUFFIN

When blinking, the oven is operating in weight input mode.

When blinking, the oven is operating in number input mode of “PROGRAM COOK”.

Menu Button-

Used to select preprogrammed cooking of five menus.

Weight Button-

Used to input weight for “MENU” function.

Start Button-

Used to start the selected cooking cycle.

Speedy Cook Button-

Used to program quickly cooking time in 30 sec increments.

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 2-wire extension cord.

The microwave oven is designed to be used when 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 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.

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

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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.

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

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