Daewoo KOR-860A0S, KOR-630A0S, KOR-860A0N Service Manual

S/M No. : R630A0S002

Service Manual

Microwave Oven

Model: KOR-630A0S

KOR-860A0S

KOR-860A0N

DAEWOO ELECTRONICS CO., LTD.

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

(a) D o not operate or allow the oven to be operated with the door open.

(b)Make the follow ing safety checks on all ovens to be serviced before activating the magnetron or other m icrow ave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other dam age), (4) D amage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

(c)Before turning on power to the m icrowave oven for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transm ission line, and cavity for proper alignment, integrity, and connections.

(d)Any defective or misadjusted components in the interlock, m onitor, door seal, and microwave generation and transmission system s 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 perform ed on each oven prior to release to the owner.

SAFETY AND PRECAUTIONS.........................................................................................................	.. 2
FOR SAFE OPERATION..................................................................................................................	2
FOR SAFE SERVICE PROCEDURES.............................................................................................	2
SPECIFICATIONS...............................................................................................................................	3
EXTERNAL VIEW ...............................................................................................................................	4
OUTER DIMENSION ........................................................................................................................	4
FEATURE DIAGRAM........................................................................................................................	5
CONTROL PANEL............................................................................................................................	6
INSTALLATION ..................................................................................................................................	7
OPERATIONS AND FUNCTIONS ......................................................................................................	8
DISASSEMBLY AND ASSEMBLY .....................................................................................................	9
INTERLOCK MECHANISM AND ADJUSTMENT ..............................................................................	16
TROUBLE SHOOTING GUIDE.........................................................................................................	.. 17
MEASUREMENT AND TEST...........................................................................................................	... 21
MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..........................................................	21
MICROWAVE RADIATION TEST.....................................................................................................	22
COMPONENT TEST PROCEDURE.................................................................................................	23
WIRING DIAGRAM .............................................................................................................................	24
PRINTED CIRCUIT BOARD ..........................................................................................................	..... 25
CIRCUIT CHECK PROCEDURE......................................................................................................	25
PCB CIRCUIT DIAGRAM .................................................................................................................	27
P.C.B. LOCATION NO......................................................................................................................	28
EXPLODED VIEW AND PARTS LIST ................................................................................................	29
DOOR ASSEMBLY...........................................................................................................................	29
CONTROL PANEL ASSEMBLY .......................................................................................................	29
TOTAL ASSEMBLY ..........................................................................................................................	29

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 m icrowave em ission check should be perform ed prior to servicing the oven.
2)	If any certified oven unit is found to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
	(a) inform the m anufacturer, im porter or assem bler,
	(b) repair the unit at no cost to the ow ner,
	(c) attem pt to ascertain the cause of the excessive leakage,
	(d) tell the ow ner of the unit not to use the unit until the oven has been brought into com pliance.
3)	If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the
	m anufacturer im m ediately.

IMPORTANT

The w ire in this m ains lead coloured in accordance w ith the following code.

G reen-and-yellow: Earth

Blue	: N eutral
Brow n	: Live

As the colours of the w ires in the m anins lead of this appliance m ay not correspond w ith the coloured m arkings identifying the term inals in your plug, proceed as follow s.

The w ire which is coloured green-and-yellow m ust be connected to the term ianl in the plug which is m arked w ith the letter ‘E’ or by earth sym bol or green-and-yellow.

The w ire which is coloured blue m ust be connected to the term inal w hich is m arked w ith the letter ‘N ’ or coloured black. The w ire which is coloured brow n m ust be connected to the term inal w hich is m arked w ith the letter ‘L’ or coloured red.

NOTE

This oven is designed for counter-top use only.

SPECIFICATIONS

KOR-630A

M O D E L		K O R -630A 0S
P OW E R S U P P LY		230V, 50Hz, S IN G LE P HA S E W IT H EA RTH IN G
	M IC RO WAVE	1200W
P OW E R C O N SU M PTIO N	G R ILL
	C O M B IN ATION
M IC R O WAV E EN E R G Y O U TP U T		800W
M IC R O WAV E FR E Q U EN C Y		2450M H z
O UTS ID E D IM EN S IO NS (W X H X D)		465 x 279 x 360 m m (18.3 x 11.0 x 14.2 in.)
C AV IT Y D IM E N S ION S (W X H X D )		290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.)
N ET W E IG H T		A PP R O X. 13 K g ( 28.7 lbs.)
TIM E R		59 m in. 90 sec.
FUN C TIO N S E LE C TION S		M IC R O WAV E
P OW E R S E LE CTIO N S		10 LE V ELS
C AV IT Y V OLU M E		0.7 C u.Ft.

KOR-860A

M OD E L		K O R-860A 0S		K OR -860A 0N
P OW E R S U P P LY		230V, 50H z(860A 0S )/220V,50H z(860A 0N)
		S IN G LE P H AS E W IT H E A RTH IN G
	M IC RO WAVE	1350W		1250W
P OW E R C O N SU M PTIO N	G R ILL
	C O M B IN ATIO N
M IC R O W AV E EN E R G Y O U TP U T			900W
M IC R O WAV E FR E Q U EN C Y			2450M H z
O UTS ID E D IM EN S IO NS (W X H X D)		495 x 294 x 388 m m (19.5 x 11.6 x 15.3in.)
C AV IT Y D IM E N S ION S (W X H X D )		320 x 244 x 338 m m (12.6 x 9.6 x 13.3 in.)
N ET W E IG H T		A P P R OX . 15 Kg ( 33.1 lbs.)
TIM E R			59 m in. 90 sec.
FUN C TIO N S E LE C TION S			M IC R OW AV E
P OW E R S E LE CTIO N S			10 LE VE LS
C AV IT Y V OLU M E			0.9 Cu.Ft.

Specifications are subject to change w ithout notice.

EXTERNAL VIEW

1. OUTER DIMENSION

KOR-630A

465

360

9 7 2

KOR-860A

495

294

EXTERNAL VIEW

2. FEATURE DIAGRAM

1.DOOR SEAL

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

2.DOOR HOOK

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

3.DOOR SCREEN

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

4.SPATTER SHIELD

Protects the microwave outlet from splashes of cooking foods.

5.OVEN LAMP

Automatically turns on during oven operating.

6.SAFETY INTERLOCK SYSTEM

7.CONTROL PANEL

8.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..

9.OVEN FRONT PLATE

10.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.

11.ROLLER GUIDE

Supports the glass cooking tray.

EXTERNAL VIEW

3. CONTROL PANEL

1.Time set pad - Used to set the cooking time and the present time.

2.Display - Cooking time, power level, indicators and present time are displayed.

3.One touch - Used to cook or reheat specific quantities of food.

4.Auto cook - Used to cook or reheat.

5.More - Used to add time to cooking.

6.Less - Used to remove time from cooking.

7.Auto Defrost - Used to defrost foods.(for weight)

8.Power - Used to set power level.

9.Defrost - Used to defrost foods.(for time)

10.Kitchen Timer - Used as a minute timer, delay cooking, hold setting after cooking.

11.Clock - Used to set clock.

12.Stop/Clear - Used to stop the oven operation or to delete the cooking data.

13.Start/easy cook - Used to start the oven and also used to set a reheat time.

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 6amperes, 230 Volts, 50 Hz / 220Volts, 50Hz(KOR-860A0N).

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

WARNING

Im proper use of the earthing plug can result in a risk of electric shock. C onsult a qualified electrician or servicem an if the earthing instructions are not com pletely 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-w ire extension cord that has a 3-blade earthing plug, and a 3-slot receptacle that will accept the plug on the appliance. The m arked 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
1	. Connect the main lead to an electrical 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	. Close the door securely.
4	. W hen the oven door is opened, the light turns off.
5	. 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.
6	. Each time a pad is touched, a BEEP will sound to acknowledge the touch.
7	. The oven automatically cook on full power unless set to a lower power level.
8	. The display will show :0 when the oven is plugged in.
9	. Time clock returns to the present tim e when the cooking time ends.

10. W hen 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.

11. If the START pad is touched and the oven does not operate, check the area betw een the door and door is closed securely. The oven will not start cooking under the door is completely closed or the program has been reset.

M ake sure the oven is properly install

Variable power cooking

On and OFF cycle time of mechanical V.P.C switch is 30 seconds.

When the V.P.C knob is set to the desired position and timer knob turns to the desired position, the V.P.C switch has a cycle (ON/OFF time(sec.)) listed below.

TOUCH POW ER PAD.	POW ER LEVEL (DISPLAY)	APPROXIMATE PERCENTAGE OF POW ER
O nce	P -HI	100 %
Tw ice	P -90	90	%
3 tim es	P -80	80	%
4 tim es	P -70	70	%
5 tim es	P -60	60	%
6 tim es	P -50	50	%
7 tim es	P -40	40	%
8 tim es	P -30	30	%
9 tim es	P -20	20	%
10 tim es	P -10	10	%
11 tim es	P -00	0 %

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 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.

CAUTION

Service personnel should rem ove their watches w henever w orking close to or replacing the m agnetron.

WARNING

W hen servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing m icrow ave. These parts are as follows - H V Transform er, M agnetron, H V C apacitor, H V D iode, H V Fuse.