DAEWOO KOR-616T0A Service Manual

Service Manual

Microwave Oven

Model: KOR-616T0A

KOR-816T0A

KOR-616T1A

DAEWOO ELECTRONICS CO., LTD.

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 microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line,

and cavity for proper alignment, intergrity, 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
PROPER USE AND SERVICE PRECAUTIONS ....................................................................................................	2
SPECIFICATIONS ...................................................................................................................................................	3
FEATURES DIAGRAM ............................................................................................................................................	4
INSTALLATION ........................................................................................................................................................	5
OPERATION PROCEDURE....................................................................................................................................	6
CONTROLS .............................................................................................................................................................	7
INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS........................................................................	17
MEASUREMENT OF THE MICROWAVE OUTPUT POWER..............................................................................	19
WIRING DIAGRAM................................................................................................................................................	21
CIRCUIT DESCRIPTION.......................................................................................................................................	22
SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR ...........................................................................	25
DISASSEMBLY AND ASSEMBLY.........................................................................................................................	26
TROUBLE SHOOTING GUIDE .............................................................................................................................	31
COMPONENT TEST PROCEDURE.....................................................................................................................	36
SAFETY INTERLOCK CONTINUITY TEST .........................................................................................................	37
PRINTED WIRING BOARD...................................................................................................................................	38
CIRCUIT CHECK PROCEDURE .....................................................................................................................	38
P.C.B. CIRCUIT DIAGRAM ..............................................................................................................................	44
COMPONENT INFORMATION ........................................................................................................................	45
PRINTED CIRCUITS BOARD..........................................................................................................................	46
P.C.B. LOCATION NO. .....................................................................................................................................	48
EXPLODED AND PARTS LIST .............................................................................................................................	50

CAUTION: This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

PROPER USE AND SERVICE 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 have excessive emission level 5mW/cm2, the service person should:

(a)inform the manufacturer, importer or assembler,

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

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

(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 CDRH immediately.

SPECIFICATIONS

	Specifications	KOR-816T	KOR-616T
Power Supply		120V ~ 60Hz, SINGLE PHASE WITH EARTHING
	POWER CONSUMPTION	1200 W	920 W
MICROWAVE	OUTPUT POWER	800 W (IEC 705)	600 W (IEC 705)
	FREQUENCY	2450 MHz
OUTSIDE DIMENSIONS (W x H x D)		495 x 289 x 409 mm	465 x 274 x 372 mm
CAVITY DIMENSIONS (W x H x D)		320x 225 x 330 mm	290x 200 x 290 mm
NET WEIGHT		APPROX. 14.0Kg	APPROX. 12.5Kg
TIMER		60 min. 00 sec
POWER SELECTIONS		5 LEVELS

* Specifications subject to change without notice.

	495							409
	(465)							(372)
		Stop				Defrost
	1			2 Quantity	Weight Time
	Lock Auto cook lb				Watt	oz
	Power			Defrost		+1min
				Auto Cook
	1. Beveroge							(274)
	2. Soup
	3. Casserole						289
	4. Vegetable
	5. Fish Fillets
				STOP		START
				STOP
	More			CLEAR		Speedy

				y
		ua	n	tit
	Less	ua
	Less	Q
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		h
		g
		i
		e
		W
		/
		r
	Clock	e
			m
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(	) : For KOR-616T

FEATURES DIAGRAM

Stop

Defrost

Quantity

Weight

Time

Stop

Defrost

2 Quantity

Weight

Time

Lock

Auto cook

Watt

Lock Auto cook l

Watt

Power

Defrost

+1min

Power

Defrost

+1min

Auto Cook

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

STOP

START

Auto Cook

Speedy

CLEAR

1. Beveroge

2. Soup

n tit

Less

3. Casserole

4. Vegetable

Clock

5. Fish Fillets

STOP

START

CLEAR

Speedy

Less

Clock

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

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

¤Ø Oven cavity.

¤Œ Spatter shield - Protects the microwave outlet from splashes of cooking foods.

¤º Safety interlock system.

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

¤Glass cooking tray - Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for cooking.

¤Roller guide - This must always be used for cooking together with the glass cooking tray.

¤Display - Cooking time, power level, present time are displayed.

¤¤æ ¤ Function buttons - Used to select desired oven operation.

:MICROWAVE, DEFROST, AUTOCOOK.

¤+1 min. button - Used to increase time of operating.

¤Start button - Used to start a selected operation. When lamp blinks, press the start button.

Speedy cook button - Used to set desired time.(It is incresed 30 seconds.)

¤ı Stop/clear button - Used to pause or clear all information manually put into the oven control panel except clock.

§§æ More/Less button - Used to select auto cook time. (More/less 10% of auto cook time)

§Clock button - Used to set and recall the time of day.

§Dial knob - Used to set the cooking time, weight and quantity.

§Guide lamp - When blinking it informs you to be ready to operte dial knob.

INSTALLATION

STEADY, FLAT LOCATION

This microwave oven should be set on a steady, flat surface.

LEAVE SPACE BEHIND AND SIDE

All air vents should be kept a clearance. lf all vents are covered during operation, the oven may overheat and, eventually, cause oven 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, or antenna, feeder and so on.

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 oven must be plugged into at least at 12 Amp 120 Volt, 60Hz grounded outlet.

• Power supply cord is about 1.0 meters long.

1.A short power-supply cord is provided to reduce the risks resulting from becoming entangled in or tripping over a longer cord.

2.Longer cord sets or extension cords are available and may be used if care is exercised in their use.

3.If a long cord or extension cord is used, (1) the marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of the appliance, (2) the extension cord must be a grounding-type 3-wire cord, and (3) the longer cord should be arranged so that will not drape over the countertop or tabletop where it can be pulled on by children or tripped over accidentally.

When use 3-pronged plug	When use grounding adaptor, make sure the
3-prong Receptacle	receptacle box is fully grounded
3-prong Receptacle
	Receptacle Box Cover
	Grounding Lead
Receptacle
Box cover
	Grounding Adaptor
3-prong plug	Receptacle

6 EXAMINE THE OVEN AFTER UNPACKING FOR ANY DAMAGE SUCH AS:

Dents, a misaligned door, broken door, a dent in cavity.

If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.

OPERATION PROCEDURE

This section includes useful information about oven operation.

1.Plug power supply cord into a 120V 60Hz 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.

When the oven door is opened, the light 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.

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

When the STOP/CLEAR pad is touched 7 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 8 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.

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

Wattage output chart

•The power-level is set by pressing the M/W pad. The chart shows the display, the power level and the percentage of power.

		( ) : For KOR-616T

Touch Power pad,	Power Level (Display)	Approximate Percentage
Once the Touch	Power Level (Display)	of Power
Once the Touch		of Power

5	800W (600W)	100%

4	650W (500W)	80%

3	450W (350W)	60%

2	300W (250W)	40%

1	140W (100W)	20%

CONTROLS

Tips: • Be sure to read the cookbook's introduction before operating the oven.

•Also remember to read this operating instruction for proper safety information and instruction bfore using the oven.

•See the cookbook for specific recipes.

•Prior to setting the controls, place one cup of water in the oven, in a heat-proof glass measuring cup, for testing purposes.

•When setting the controls, everytime a button is pressed, a beep can be heard.

•If you don't take off the food after end cooking, buzzer will sound as 1 minute.

CLOCK

NOTE: • When the oven is plugged in, “0:00”appears in the display window.

•The two dots between the hour and minute are the clock indicator lights. They will start to flash on and off.

•The time of day will be displayed at all times, except when the oven is operating.

•In the oven of a power failure or if the oven is unplugged, the clock will have to be reset for the proper time. Once power is restored or oven is plugged in, the display will show “0:00”.

•To reset the time of day, repeat the steps given below.

•To check the time of day while the oven is poerating, press the CLOCk button, then the time will be displayed for 3 seconds.

•When you turn DIAL KNOB, minutes are increased by to turn right and hours are increased as to turn left.

SETTING THE CONTROL

1. Press CLOCK button.	This example is 24 hour clock
If you push the CLOCK	system.
button once again, you can
select 12 hour clock	NOTE: This oven is mul-
system.	tiple clock system.
Then guide lamp will starts
blinking.

NOTE: If you are not setting current time for 3 seconds, display return to old time.

2.Turn left the DIAL KNOB for hour you want.

NOTE:

•If you selected 12 hour clock system, this digital clock allows you to set from 1:00 to 12:59.

•If you selected 24 hour clock system, this digital clock allows you to set from 0:00 to 23:59.

•The colon will stop blinking.

3.Turn right the DIAL KNOB for minute you want.

4. Press CLOCK button.	The display will show present
	time, and the colon starts
	blinking.
	This digital clock allows you to set
	to “10:10”

TIME DEFROST

SETTING THE CONTROL

1. Press DEFROST button	This TIME DEFROST indicator
twice.	light will light up.
	Time

2.Turn the DIAL KNOB for the desired defrosting time.

20:00 will show in the display.

Time

For example: 20 minutes.

NOTE: Time can be set up to 60 minutes.

3. Press button.

Time

The TIME DEFROST indicator light will start blinking to show the oven is in TIME DEFROST mode.

4.Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day. The oven light will turn off and the turntable will stop turning.

NOTE: During the defrosting operation, turn over after buzzer sound for completed defrosting.

WEIGHT DEFROST

NOTE:• This digital weight allows you set from 8 oz to 6 lb 8 oz.

•Whenever you press this button, the display is circulated WEIGHT DEFROST, TIME DEFROST, and MICROWAVE mode.

SETTING THE CONTROL

1.Press DEFROST button once.

Weight

The WEIGHT DEFROST indicator light will come on.

The lb, oz indicator light will start blinking.

2.Turn the DIAL KNOB for the desired defrosting weight.

The 204 will show in the display.

Weight

For example: 2 lb 4 oz

3. Press button.

Weight

The WEIGHT DEFROST indicator light will start blinking to show the oven is in WEIGHT DEFROST mode.

NOTE: During the defrosting operation, turn over the food after buzzer sound for completed defrosting.

COOKING IN ONE STAGE

NOTE: • To insure the best microwave and defrost results, be sure to start with a cool oven. Let the oven cool 15~20minutes with the door slightly open.

•Power levels are 800W, 650W, 450W, 300W, 140W(KOR-816T) or 600W, 500W, 350W, 250W and 100W(KOR-616T)

•It is displayed after an interval of 10 seconds from 10 seconds to 5 minutes, 30 seconds from 5 minutes to 10 minutes, 1 minute from 10 minutes to 60 minutes.

SETTING THE CONTROL

1. Press POWER button

By repeatedly pressing this button, you can also select other power levels.

For example: 800WATT (KOR-616T:600)

Stage

Watt

The STAGE1 indicator light will light. The WATT indicator light start blinking.

2.Turn the DIAL KNOB for the desired cooking time.

10:00 will show in the display.

		Stage
		Stage
For example: 10minutes	1	NOTE: Time can be set up
For example: 10minutes		NOTE: Time can be set up
		to 60 minutes.

3. Press button.

Stage

The STAGE1 indicator light will starts blinking to show the oven is in MICROWAVE mode.

COOKING IN TWO STAGES

NOTE: For best results, some recipes call for one power level for a certain length of time and another power level for a different length of time.

SETTING THE CONTROL

1.Press POWER button more than three times.

By repeatedly pressing this button, you can also select other power levels.

Stage

Watt

The STAGE1 indicator light will light.

The WATT indicator light start blinking.

For example: 450WATT (KOR-616T:350WATT)

2.Turn the DIAL KNOB for the desired cooking time.

10:00 will show in the display.

		Stage
		Stage
For example: 10 minutes	1	NOTE: Time can be set up
For example: 10 minutes		NOTE: Time can be set up
		to 60 minutes.

3. Press POWER button

By repeatedly pressing this button, you can also select other power levels.

Stage

The STAGE2 indicator light will light

The WATT indicator start blinking.

Watt

For example:800WATT (KOR-616T:600W)

4.Turn the DIAL KNOB for the desired cooking time.

Stage

18:00 will show in the display.

For example: 18minutes

NOTE: Time can be set up to 60 minutes.

5. Press

button.

When you touch START, both

Stage

STAGE1 & 2 indicator lights come

on.

STAGE1 indicator light blinking to

show you that the oven is cooking in

the first of two cook stages.

The oven will cook at the power you

selected for stage 1.

At the end of stage 1, the oven will

beep and start the second stage 2.

Stage

The STAGE1 indicator light will go off

and the STAGE2 indicator light starts

blinking. The display counts down the

time to show you how much cooking

time is left in the second stage.

6.Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day. The oven light will turn off and the turntable will stop turning.

AUTO COOK

NOTE: • There is programmed for cooking of five kinds (1~5)

• You don't have to worry about setting time, power and function.

SETTING THE CONTROL

You can operate MORE or LESS than programmed time as pressing MORE or LESS button whenever MORE or LESS button, display is changed “10” or “-10”.

10: Adds 10% for programmed time. -10: Romove 10% for prjogrammed time.

1. Press AUTO COOK button

Quantity

Auto cook

The AUTO COOK indicator light will light “AC-1” will show in the display.

2.Select the desired cooking.

For example: SOUP

Press AUTO COOK button twice.

Quantity

Auto cook

“AC-2” will show in the display. The quantity indicator light will start blinking

3.If you want to select other menu, press AUTO COOK button until display your desired cooking menu.

4.Turn the DIAL KNOB for

desired cooking quantity.

Auto cook

5.Select the desired cooking quantity.

“3” will show in the display.

For example: 3(12.3oz)

Auto cook

6. If you want to select other, turn the dial Knob until display you desired.

7. Press button.

This example don't set MORE or LESS function.

The oven will now start auto cook for menu2.

The indicator light starts blinking.

For example: KOR-616T

Auto cook

8.Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day. The oven light will turn off and the turntable will stop turning.

NOTE: • AUTO COOK menu and quantity.

	MENU NO	QUANTITY NO
		1	1 CUP
1	BEVERAGE	2	2CUPS
		3	3CUPS
		1	8.8 oz
2	SOUP
2	SOUP	2	10.6 oz

		3	12.3 oz

		4	14.1 oz
		1	7.1 oz
3	CASSEROLE	2	14.1 oz
		3	1 lb 5 oz
		4	1 lb 12 oz
		1	8.8 oz
4	VEGETABLE
4	VEGETABLE	2	10.6 oz

		3	12.3 oz

		4	14.1 oz

		1	10.6 oz
		2	14.1 oz
5	FISH FILLET	3	1 lb 2 oz
		4	1 lb 5 oz
		5	1 lb 9 oz

SPEEDY COOK

SETTING THE CONTROL

1. Press button.

Then start lamp will start blinking.

Whenever the button is pressed, cooking time is increased 30 seconds.

If the time was setting, this oven is operated automatically after 2 seconds to microwave high power.

NOTE: This key is increased from 30 seconds to 5 minutes.

If you are pressing more than about 0.5 seconds, the time is increased 30 seconds continuously.

CHILD SAFTY LOCK

•The safty lock prevents unwanted oven operation such as by small children.

•To set, press STOP/CLEAR for 3 seconds, lock indicator light starts blinking.

•To cancel, press STOP/CLEAR for 3 seconds, lock indicator goes off.

+1 min.

•The function can use when oven is working state.

•Whenever press this button, time is increased as 1 minute.

•Time is increased until 60 minutes.

STAGE COMVINATIONS

This oven has the ability to be programmed to do up to three consecutive functions. These combinations are five below and either the complete program or part of it can be used.

STAGE COOKING

TIME / WEIGHT		DEFROST

STAGE 1 (M/W)

STAGE 2 (M/W)

¡When you set stage mode, indicator is lighted only setting.

¡When you press START button, all indicators are lighted setted function. Indicator of operating function is blinking.

TO STOP THE OVEN WHILEITIS OPERATING

1.Press (STOP/CLEAR) button.

-Touch once more to erase all instruction except clock. -You can restart the oven by touching (START) button.

2.Open the door

-You can restart the oven by closing the door and touching button.

NOTE: Oven stops operating when door is opened.

ERASING INSTRUCTIONS

•TOUCH (STOP/CLEAR)button to erase all instructions you set previously.

•Opening the oven door during cooking dose not erase cooking instruction.

•If you push twice button during operation, the cooking instruction is all erased.

GENERAL COOKING HINTS

1.When cook a roast with an excess amount of drippings, it is helpful to remove the drippings at turnover time to prevent spattering.

2.Prick the meats, fish or poultry with a fork to prevent bursting.

Steam builds up pressure in meats, fish or poultry which are tightly covered by a skin or membrane.

3.Reduce suggested cooking times, It is always better to undercook foods rather than to over-cook them. If a range of times is stated in a recipe, cook the minimun suggested time, check for doneness, and then cook slightly longer if necessary.

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS

The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

(1) Primary interlock switch

When the door is closed, the hook locks the oven door. If the door is not closed properly the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the primary interlock switch bring it under on condition.

Latch

Mounting serew

Button

Hook

Primary interlock switch

Adjustment 1.

When the door is closed, the switch button is pushed by the hook.

The movement of the switch button should exceed 1.2mm measured at the top of the button.

1.2mm

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