Daewoo KOR-616T 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

1

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/cm 2 , 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.

2

SPECIFICATIONS

Specifications

Power Supply

MICROWAVE

POWER CONSUMPTION

OUTPUT POWER

FREQUENCY

OUTSIDE DIMENSIONS (W x H x D)

CAVITY DIMENSIONS (W x H x D)

NET WEIGHT

TIMER

POWER SELECTIONS

* Specifications subject to change without notice.

KOR-816T KOR-616T

120V ~ 60Hz, SINGLE PHASE WITH EARTHING

1200 W

800 W (IEC 705)

920 W

600 W (IEC 705)

495 x 289 x 409 mm

2450 MHz

465 x 274 x 372 mm

320x 225 x 330 mm

APPROX. 14.0Kg

290x 200 x 290 mm

APPROX. 12.5Kg

60 min. 00 sec

5 LEVELS

409

(372)

( ) : For KOR-616T

495

(465)

1

Stop

2 Quantity

Defrost

Weight Time

Lock Auto cook lb Watt oz

Power Defrost +1min

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Auto Cook

STOP

START

Speedy

More CLEAR

Less ua t/Q nt ity

Clock

3

FEATURES DIAGRAM

1 2 3

6

4 5

1

Stop

2 Quantity

Defrost

Weight Time

Lock Auto cook

Power Defrost

Watt oz

+1min

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Auto Cook

STOP

START

More

Less

CLEAR t/Q ua nt ity

Speedy

Clock

7

0 q t y u i

1

Stop

2 Quantity

Defrost

Weight Time


Power Defrost +1min

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Auto Cook

STOP

START

Speedy

Less

Clock

More CLEAR t/Q ua nt ity er

Tim

9 p o w e r

8

¤ 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.

4

INSTALLATION

1 STEADY, FLAT LOCATION

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

2 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

3-prong Receptacle

When use grounding adaptor, make sure the receptacle box is fully grounded

Receptacle Box Cover

Grounding Lead

Receptacle

Box cover

3-prong plug

Grounding Adaptor

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.

5

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.

1 When the oven door is opened, the light turns off.

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

2

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.

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

7

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.

4

5

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.

8 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.

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,

Once the Touch

5

4

3

2

1

Power Level (Display)

800W (600W)

650W (500W)

450W (350W)

300W (250W)

140W (100W)

Approximate Percentage of Power

100%

80%

60%

40%

20%

6

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.

If you push the CLOCK button once again, you can select 12 hour clock system.

Then guide lamp will starts blinking.

This example is 24 hour clock system.

NOTE

: This oven is multiple clock system.

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.

7

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 twice.

Time

This TIME DEFROST indicator light will light up.

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

For example: 20 minutes.

3. Press button.

Time

20:00 will show in the display.

NOTE

: Time can be set up to 60 minutes.

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.

8

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.

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

For example: 2 lb 4 oz

3. Press button.

Weight lb oz

The WEIGHT DEFROST indicator light will come on.

The lb, oz indicator light will start blinking.

The 204 will show in the display.

Weight lb oz

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.

9

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)

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

For example: 10minutes

1

Stage

1

Stage

Watt

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


NOTE


3. Press button.

1

Stage

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


10

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.


For example: 450WATT

(KOR-616T:350WATT)


For example: 10 minutes

1

Stage

1

Stage

Watt

The STAGE1 indicator light will light.

The WATT indicator light start blinking.


NOTE


3. Press POWER button


For example:800WATT

(KOR-616T:600W)


For example: 18minutes

Stage

2

Watt

Stage

2

The STAGE2 indicator light will light

The WATT indicator start blinking.


NOTE


11

5. Press button.

1

Stage

2

Stage

2

When you touch START, both

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.

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.


12

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

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

Auto cook

2. Select the desired cooking.

For example: SOUP

Press AUTO COOK button twice.

Auto cook

Quantity

“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.

For example: 3(12.3oz)

Auto cook

“3” will show in the display.

13

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.

For example: KOR-616T

Auto cook

The oven will now start auto cook for menu2.

The indicator light starts blinking.

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

1 BEVERAGE

2 SOUP

3 CASSEROLE

4 VEGETABLE

5 FISH FILLET

QUANTITY NO

1

2

3

1

1 CUP

2CUPS

3CUPS

8.8 oz

4

5

2

3

4

1

2

3

2

3

10.6 oz

12.3 oz

4

1

2

14.1 oz

7.1 oz

3

14.1 oz

1 lb 5 oz

4 1 lb 12 oz

1 8.8 oz

10.6 oz

12.3 oz

14.1 oz

10.6 oz

14.1 oz

1 lb 2 oz

1 lb 5 oz

1 lb 9 oz

14

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.

15

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.

16

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.

17

(2) Secondary interlock switch and interlock monitor switch

When the door is closed, the hook pushes the push lever down ward, the push lever presses the button of the interlock monitor switch to bring it under “off”, condition and presses the button of the secondary interlock switch to bring it under “on”, condition.

Monitor interlock switch

Secondary interlock switch

Hook

Push lever

Adjustment 2.

Interlock monitor switch

When the door is closed, the interlock monitor switch should be opened before other switches close.

When the door is opened, the interlock monitor switch should be closed after other switches open.

Secondary interlock switch

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

(3) Adjustment steps a) Loosen the two mounting screws.

b) Adjust interlock switch assembly position.

c) Confirm the gap (1.2mm) described above.

d) Make sure that push lever moves smoothly after adjustments in completed.

e) Completely tighten the two mounting screws.

NOTE

: Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed 4mW/cm 2 , readjust interlock mechanism.

(4) Interlock switch resplacement

Whenever safety interlock switch are replaced:

1) Refer to the following diagram.

2) Check the connection of monitor switch after replacement.

3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.

Secondary interlock switch

Interlock

Monitor switch

BK


BL

BL BK BL RD RD

SYMBOL COLOR

RD RED

BK

BL

BLACK

BLUE

18

MEASUREMENT OF THE MICROWAVE OUTPUT POWER

Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below.

Procedure

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1,000±5cc of potable water.

2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test.

The initial temperature of the water is 10±2°C (50±3.6°F).

It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf which is in the lowest normal position.

4. Microwave power is switched on.

5. Heating time should be exactly 52 seconds (KOR-

816T) or 70 seconds (KOR-616T).

Water Load

Heating time is measured while the microwave generator is operating at full power.

The filament heat-up time for magnetrons is not included.

6. The initial and final water temperatures are select-ed so that the maximum difference between the ambient and final water temperatures is 5K.

Tray

7. The microwave power output P in watts is calculated from the following formula:

P = 4187 x ¡ T/t

• ¡ T is actual temperature rise.

• t is the heating time.

The power measured should be 800W(KOR-816T) ¡ 10% or 600W(KOR-616T) ± 10%

CAUTION:

1. Water load should be measured exactly to 1 liters.

2. Input power voltage should be exactly 120 volts as specified.

3. Ambient temperature should be 20±2°C (68±3.6°F)

19

MICROWAVE RADIATION TEST

WARNING

Make sure to check the microwave leakage before and after repair or adjustment.

• Always, start measuring of an unknown field to assure. Safety for operating personnel from microwave energy.

• Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

• Care should be taken not to place the eyes in direct line with the source of microwave energy.

• Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.

Procedure

A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100°C or 212°F.

B) Pour 275cc ¡ 15cc of tap water initially at 20 ¡ 5°C (68 ¡ 9°F) in the 600cc beaker with an inside diameter of approx. 8.5cm (3.5 in).

C) Place it at the center of the tray and set it in a cavity.

D) Close the door and operate the oven.

E) Measure the leakage by using microwave energy survey meter with dual ranges, set to 2,450 MHz.

-Measured radiation leakage must not exceed the values prescribed below.

• Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm 2 .

-When measuring the leakage, always use the 2 in (5cm) space cone with probe. Hold the probe perpendicular to the cabinet, door. Place the space cone of the probe on the door, cabinet, door seam, door viewing screen, the exhaust air vents and the suction air vents.

-Measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unknow, move the probe more slowly.

1

Stop

2 Quontity

Defrost

Weight Time

Lock Auto cook

Power

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Auto Cook

More

Defrost

STOP

CLEAR

Watt oz

+1min

START

Speedy ua t/Q nt ity

Less

Clock

-When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 inches from any metal.

If it does, erroneous reading may result.

20

WIRING DIAGRAM

0A TYPE

POWER SUPPLY:

SINGLE PHASE ONLY

FUSE

RD

PRIMARY

INTERLOCK

SWITCH(UPPER)

RD

RD

L R

RD

LIVE

BK

GN

INTERLOCK

MONITOR

SWITCH

NEUTRAL

CONTROL P.W.B. ASS’Y

1

RELAY-1

BL 2 RELAY-2

GN

BL

BL

SECONDARY

INTERLOCK SWITCH

BK

GY

NOTE RD : RED

WH : WHITE

BK : BLACK

GN : GREEN

BR : BROWN

3

GY

CL

RD

GY

GY

GM

GY

FM

GY

HIGH VOLTAGE

TRANSFORMER

WH

OR : ORANGE

BL : BLUE

GY : GRAY

GE : GREEN/YELLOW

CL : CAVITY LAMP

FM : FAN (BLOWER) MOTOR

GM : GEARED MOTOR

OR

H.V.

CAPACITOR

H.V. DIODE

(CONDITION)

DOOR : CLOSED

COOK : OFF

MAGNETRON

1A TYPE

CAVITY

THERMOSTAT

PRIMARY

INTERLOCK

SWITCH(UPPER)

RD

WH

L R

RD

HIGH VOLTAGE

TRANSFORMER

POWER SUPPLY:

SINGLE PHASE ONLY

FILTER ASS’Y

L

FUSE

L

N

N

GN

GN

RD RD

BK

INTERLOCK

MONITOR

SWITCH

CONTROL P.W.B. ASS’Y

1

RELAY-1

BL

2 RELAY-2

GN

BL

BL

SECONDARY

INTERLOCK SWITC H

BK

GY

3

NOTE RD : RED

WH : WHITE

BK : BLACK

GN : GREEN

BR : BROWN

GY

CL

GY

GY

GM

GY

FM

GY

WH

OR : ORANGE

BL : BLUE

GY : GRAY

GE : GREEN/YELLOW

CL : CAVITY LAMP

FM : FAN (BLOWER) MOTOR

GM : GEARED MOTOR

Fig. 1

OR

H.V.

CAPACITOR

OR

H.V. DIODE

(CONDITION)

DOOR : CLOSED

COOK : OFF

MAGNETRON

21

CIRCUIT DESCRIPTION

Refer to the “WIRING DIAGRAM” (Fig. 1) on page 21.

MICROWAVE COOKING

TIME COOKING

1. When the food is placed incide the oven and door is closed.

1) The low voltage transformer supplies the necessary voltage to the touch control circuit when the power cord is plugged in.

2) The contacts of the interlock monitor switch open.

This switch creates short circuit to blow 15A fuse and stop magnetron oscillation when door is opened during operation under abnormal condition (i.e. the contacts of primary interlock switch do not open the circuit).

3) The contacts of primary interlock switch close the primary circuit.

2. When cooking cycle, power and time are set by touching the function pads and the desired numerical pads.

1) The function indicating bars are located on the digitron light to indicate that function have been set.

2) The time you set appears in the display window.

3) The touch control circuit memorizes the cooking program you set.

3. When the start button is touched.

* The RELAY “1”, “2” are controlled by the touch control circuit.

1) 120VAC is applied to the high voltage transformer through the contacts of RELAY “1”(See Fig.1)

2) Fan motor starts rotating and cools the magnetron by blowing the air coming from the intake on the rear plate hole.

3) The oven lamp light the inside of the oven.

4) Indicator light turns on to indicate function operation. Cooking time starts count down.

5) 3.3 Volts AC is generated from the filament winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils.

6) A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant DC voltage is then applied to the anode of the magnetron. As shown in Fig.

2 the first half cycle of the high voltage produced in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begin. The disturbance wave generated by the magnetron is prevented by the choke coils of 3.2µH, filter capacitors of 16pF and the magnetron’s shielded case so that TV and radio programs are not impaired by noise.

22

3.3V

OR

H.V.

CAPACITOR

FA

OR

H.V. DIODE

F

MAGNETRON

2000V

H.V. TRANSFORMER WIRING COLOR

OR: ORANGE

Fig.2

The touch control circuit controls the ON-OFF time of RELAY “1” in order to vary the output power of the microwave oven from “power level 1” to “5 (100%) power”.

One complete ON and OFF cycle of the RELAY “1” is 29 seconds. The relation between indications on the control panel and the output of the microwave oven is as shown is Fig. 3

23

POWER LEVEL

3

4

1

2

5

OUTPUT POWER

AGAINST FULL POWER

5/29

11/29

17/29

23/29

29/29

Fig. 3

RELAY “1” TURN ON, OFF TIME

ON 5S

OFF

ON 11S

OFF

ON 17S

OFF

ON

OFF

ON

23S

29S

OFF

AUTO DEFROST CYCLE

When auto defrost is selected and the desired defrosting time is chosen, the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times, by cycling on and off.

4. When the door is opened during cooking.

1) The primary interlock switch is opened to cut off primary voltage to the high voltage transformer to stop microwave oscillation.

2) The secondary interlock switch is opened to give the door open information to touch control circuit.

The contacts of the RELAY “1” and “2” open, the display stops counting down.

3) Fan motor and turn table stop rotating.

4) The oven lamp turns off.

5) As soon as the door is opened, the interlock monitor switch contacts close and creats the short circuit.

6) If the contacts of primary interlock switch malfunction the 15A fuse blows open due to the large current surge caused by the short circuit activation, and this in turn stops magnetron oscillation (Fig. 1).

5. When the STOP/CLEAR button is touched during cooking.

1) The touch control circuit cuts the voltage supplied to the RELAY “1” coil and causes the magnetron to stop oscillating.

2) RELAY “2” turns off.

3) The display will show the time of day. If you don’t set the clock, the display will show a colon.

4) The oven lamp turns off.

5) Fan motor and turn table motor stop rotating.

24

SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR

-Cautions to be observed when trouble shooting.

Unlike many other appliances, the microwave oven is a 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 screw driver which is attached to irom plate, and wear 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 with earthed.

It is imperative, therefore, to makes sure it is earthed properly before begining 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 vol-tage capacitor, by using a properly insulated screw driver to discharge.

(4) When the 15Amp. fuse is blown out due to the operation of the monitor switch; replace primary, secondary interlock switch and monitor switch.

Refer to next page for the necessary adjustment.

(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 repairing 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-H.V.

Transformer, Magnetron, H.V. Capacitor, H.V. Diode.

25

DISASSEMBLY AND ASSEMBLY

1. To remove cabinet.

Remove three screws on cabinet back.

2. To remove door assembly.

1) Remove two screws ¤ which secure the stopper hinge top.

2) Remove the stopper hinge top ¤Ł and door assembly ¤Ø from top plate of cavity.

3) Remove the stopper hinge top ¤Ł from door assembly.

4) Reverse the above for reassembly taking care to replace fixing glue.

NOTE

: After replacing the door perform a check of correct alignment with the hinge and cavity front face.

3. To remove door parts.

A01 A02 A03 A04 A05 A06 A07

1

2

3

A08

A09

A10

A11

26

(1) Remove the gasket door(A07) from door painting ass’y(A05).

(2) Remove the door frame(A01) from door painting ass’y(A05).

(3) Remove the barrier screen outer(A02) and the supporter barrier screen outer(A03).

(4) Remove the hook spring(A09) and the hook(A08).

(5) Remove the hinge stopper top ass’y(A04).

(6) Remove two screws(A11) which secure the handle door(A10).

(7) Rmove the handle door(A10) from the door frame(A01).

(8) Reverse the above steps for reassembly.

A

4. Method to reduce the gap between the door seal and the oven front surface.

(1) To reduce gap located on part ‘A’.

1) Loosen two screws on the top hige stopper,and then push the door to contact the door seal to oven front surface.

2) Tighten two screws.

D

1

Stop

2 Quantity

Defrost

Weight Time

Lock Auto cook

Power Defrost

Watt oz

+1min

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Auto Cook

STOP

More

Less

CLEAR t/Q ua nt ity

START

Speedy

Clock

B C

(2) To reduce gap located on part ‘B’.

1) Loosen three screws on bottem hinge stopper, and then the door to contact the door seal to oven front surface.

2) Tighten three screws.

(3) To reduce gap located on part ‘C’. (See Fig. A)

1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body.

2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.

3) Tighten a screw.

(4) To reduce gap located on part ‘D’.(See Fig. B)

1) Loosen a screw on the interlock switch assembly located at the top of the oven body.

2) Follow step (3) 2) and 3).

Interlock monitor swtich

Secondary interlock switch Mounting screw

Hook

Hook

Mounting screw


Fig. A Fig. B

NOTE

: A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm 2 .

27

5. To remove control panel parts.

(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.

NOTE

: Do not attempt to remove switch membrane except for replacement.

B01 B02 B03 B04 B05

B06

B07

B08 B09 B10

(2) Pull out the knob volume (B07) form the control panel ass’y.

(3) Remove eight screws (B05) which secure the PCB ass’y(B10).

(4) Remove the PCB ass’y (B10) from the control panel (B02).

(5) Remove the button cook (B04), the button auto cook (B09), the button start (B03) and the button function (B08) from the control panel (B02).

(6) Remove the decorator panel (B01) from the control panel(B02).

(7) Rmove the window display (B06) from the decorator panel(B01).


28

6. To remove high voltage capacitor.

(1) Remove a screws ¤ which secure the grounding ring terminal of the H.V. diode ¤Ł and the capacitor holder ¤Ø.

(2) Remove the H.V. diode ¤Ł from the capacitor holder ¤Ø .

(3) Remove the above steps for reassembly.

High voltage circuit wiring

Magnetron

H.V. Capacitor

H.V. Diode

H.V. Transformer

7. To remove magnetron.

(1) Remove three screws ¤ which secure the magnetron ¤Ł.

(2) Remove the magnetron ¤Ł .


29

2

1

1

3

2

CAUTION

: 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/cm 2 for a fully assembled oven with door normally closed.

Metallic gasket plate

Magnetron antenna Wave guide Magnetron antenna

Cooling fin

Magnetron Filament terminal

Metallic gasket plate

8. To remove fan motor assembly.

(1) Remove two screws ¤ which secure the back cover ¤Ł from the cavity outer.

(2) Remove two screws ¤Ø which secure the fan motor ¤Œ from the back cover ¤Ł.

(3) Pull out the fan ¤º from the fan motor ¤Œ .


1

3

5

1

2

4

9. To remove transformer.

(1) Remove the four screws ¤ holding the H.V.

transformer ¤Ł.

(2) Remove the transformer ¤Ł.


2

1

30

TROUBLE SHOOTING GUIDE

Folling the procedure below to check if the oven is defective or not.

1. Check earthing before fault finding.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE

: When electric parts are checked or replaced, be sure the power cord is not inserted the wall outlet.

Check wire harness, wiring, and connection of the terminals, and power cord before check the parts listed below.

(TROUBLE 1) The following visual conditions indicate a probable defective touch control circuit.

1. Incomplete segments.

(A) Segments missing.

(B) Partial segments missing.

(C) Digit flickering other than normal fluorescent slight flickering.

2. A distinct change in the brightness of one or more numbers is in the display.

3. One or more digits in the display are not on when they should be.

4. Display indicates a number different from one setted. (For example, when 5:00 setted, 3:00 appears in the display.)

5. Specific numbers (for example 2 or 3) do not display when the dial knob is rotated.

6. Display does not count down or up with time cooking or clock operation.

7. Oven is programmable and cooks normally but no display shows.

8. Display obviously jumps in time while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display can not shift from the first stage cooking to the third stage cooking while 3 phase cooking (including defrost).

11. Display does not show the time of day when clear button is pressed.

12. Oven lamp, fan motor and turn table motor do not stop although cooking is finished. Check if the RELAY (RY2) contacts close if they are close, replace touch control circuit.

1

Stop

2

Lock Auto cook

Quantity

Defrost

Weight Time lb Watt oz

31

(TROUBLE 2) Oven does not operte at all; any inputs can not be acceted

Condition Check Result Cause

Fuse blows Check continuity of interlock monitor switch with door closed.

(COM NC)

(COM NC)

Continuity

Malfunction of

Interlock monitor switch

(COM NC)

No continuity

Remedy

Replace

NOTE 1

Check continuity of both Primary and secondary interlock switch with door closed

No

Continuity

Continuity

Malfunction of interlock switch

Replace

NOTE 1

Check continuity of primary interlock switch contact with door partially open unit interlock monitor switch contact close

(COM NC close)

Continuity

Shorted contacts of primary interlock switch

Replace

NOTE 1

Check continuity of primary winding of low voltage transformer.

Disconnect high voltage fuse and operate the unit

0

Ω

or infinite

Approx

90-120

Ω

(normal)

Fuse again bolows

Defective low voltage transformer

Replace

Defective high voltage transformer

Replace

32

Condition

Outlet has proper

Voltage

Fuse does not open

Check

Check continuity both magnetron and heater thermostat

Check continuity of noise filter board

Check continuity of power supply cord.

Result

No

Continuity

No

Continuity

No

Continuity

Cause

Defective magnetion and heater thermostat

Defective line filter borard

Open power supply cord

Normal

Defective touch control circuit

Remedy

Replace

Replace

Replace

Replace

NOTE 1

: All these switches must be replaced at the same time, please refer to page 17 and 18 for adjustment instructions.

(TROUBLE 3) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start button is tapped.

Condition

Turn table motor fan moter and oven lamp do not turn on

Check

Check continuity of primary interlock switch

Result

No

Continuity

Cause

Malfunction of


Remedy

Adjust or replace

Check continuity of secondary interlock and D.O.M. switch

No

Continuity

Malfunction of secondary

interlock and

D.O.M. switch

Adjust or replace

Check D.C. voltage being supplied to

RELAY (RY2) coil.

0V


Replace

Approx.

Faulty contacts of RELAY (RY2) open relay coil

Replace

33

(TROUBLE 4) No microwave oscillation even though fan motor rotates.

Condition Check Result Cause

No microwave oscillation

Check continuity of high voltage fuse

No

Continuity

Check continuity of high voltage capacitor terminals with wires removed

Check continuity of high voltage recitifier in forward and backward direction with

DC meggr

Continuity

Continuity in backward direction

Connect megger leads to magnetron terminal and magnetron body

Check resistance of primary and secondary coil of high voltage transformer

Continuity

0

Ω

or

Check continuity of magnetron heater with wires removed

No

Continuity


Defective high voltage rectifier

Defective magnetron


Defective magnetron

Check continuity of filament terminal of high voltage transformer

No

Continuity


Check D.C. voltage being supplied to RELAY

(RY1)coil

0V

Approx.

-16V DC


Faulty contacts of

RELAY(RY1) or open relay coil

Remedy

Replace

Replace

Replace

Replace

Replace

Replace

Replace

Replace

34

Condition

Display does not show program ming at all, even if button key is pressed

Check

Check each button for continuity the tach switch deyboard as the following keyboard check procedure.

Result

Normal

Normal

Cause

Malfunction of touch control circuity of control box main-assembly

Malfunction of touch control circuitry of control box sub-assembly

Remedy

Replace control box main assembly

Replace control box sub-assembly

NOTE

: Before following the particular steps listed above in the trouble shooting guide for failure, please check for the continuity of each wire-harness between the tact switch keyboard and PCB assembly.

KEYBOARD CHECK PROCEDURE

1. Type of encoding and key names

CLOCK

7

STOP

CLEAR

8

LESS

9 w

DEFROST POWER

r

0

MORE START

AUTO

COOK

+1 min

q

CN101

Fig. 4 KEY MATRIX

The tact switch keyboard consists of 9 keys whose aconfigurations are described above.

2. Key check procedure

To determine if the tact switch keyboard is defective or not, check the continuity of each button contacts with a multimeter.

1) CLOCK button: Between 7 and 10

2) STOP/CLEAR button: Between 8 and 10

3) LESS button: Between 9 and 10

4) DEFROST button: Between 12 and 10

5) POWER button: Between 14 and 10

6) MORE button: Between 7 and 11

7) START button: Between 8 and 11

8) AUTO COOK button: Between 12 and 11

9) +1 min button: Between 14 and 11

35

COMPONENT TEST PROCEDURE

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 25).

1. High voltage transformer

(A) Remove connections from the transformer terminals and check continuity.

(B) Normal readings should be as follows:

Secondary winding.............................................

.....................Approx. 100

Ω

¡ 10%(KOR-816T)

.....................Approx. 140

Ω

¡ 10%(KOR-616T)

Filament winding .............................Approx. 0

Ω

Primary winding...............................Approx. 0

Ω

2. High voltage capacitor

(A) Check continuity of capacitor with meter on the highest OHM scale.

(B) A normal capacitor will show continuity for a short time, and then indicate 9M

Ω once the capacitor is charged.

(C) A shorted capacitor will show continuous continuity.

(D) An open capacitor will show constant 9M

Ω

.

(E) Resistance between each terminal and chassis should be infinite.

3. High voltage diode

(A) Isolate the diode from the circuit by disconnecting the leads.

(B) With the ohmmeter set on the highest resistance scale, measure the resistance across the diode terminals.

Reverse the meter leads and agin observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. Anormal diodes resistance will be infinite in one direction and several hundred

K

Ω inthe other direction.

4. Magnetron

For complete magnetron diagnosis, refer to

“Measurement of the Microwave Output

Power”. (Page 19) Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.

(A) Isolate magnetron from the circuit by disconecting the leads.

(B) A continuity check across magnetron filament terminals should indicate ohm or less.

(C) A continuity check between each filament terminal and magnetron case should read open.

5. Interlock monitor switch

The interlock switch can be checked with an ohmmeter. Isolate the switch and then connect the meter leads to the common (COM) and normally close (NC) terminals of the switch. The meter should indicate an open circuit with the door closed and a closed circuit with the door opened.

6. Primary and secondary interlock switch

The primary and secondary interlock switch can be checked with an ohmmeter. Isolate the switch and connect the meter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate an open circuit with the door opened and a closed circuit with the door closed. In case improper operation is indicated, make the necessary switch adjustment or replacement.

36

SAFETY INTERLOCK CONTINUITY TEST

• Disconnect the oven from the power supply.

• You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter.

• The switch operation is checked by the lamp on/off of resistance zero/unlimited.

• The sequence of check is interlock monitor switch; primary and secondary interlock switches check.

• Make circuits like Fig. a, Fig. b, for tests.

1) In case of interlock monitor switch check.

POWER

SUPPLY

CORD

PRIMARY

INTERLOCK SWITHC

INTERLOCK

MONITOR

SWITCH

Condition:

1) Door is opened.

2) Common terminal of the monitor switch disconnected.

OHMMETER

- Fig. a -

2) In case of primary interlock switch check.

Condition:

1) Door is closed.

PRIMARY

INTERLOCK SWITHC

POWER

SUPPLY

CORD

INTERLOCK

MONITOR

SWITCH

OHMMETER

- Fig. b -

37

PRINTED WIRING BOARD

1. CIRCUIT CHECK PROCEDURE

1) Low voltage transformer (DMR-814P) check.

The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage:120V

Frequency : 60Hz

A

C

D

Voltage

Terminal

C-D

E-F

LOAD NO LOAD

-19VDC

2.1VDC

-24VDC

2.2VAC

B

E

F

NOTE 1

: Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.

NOTE 2

: The acceptable tolerance of the secondary voltage is within ¡ 5% of norminal voltage

2) Voltage check

Key check point (MICOM PIN)

NO.

1

2

3

4

CHECK POINT

PIN 21,24,32,33 OR 34

PIN 48

PIN 44

PIN 18 OR 19

5 DP1 PIN 1& 25

CHECK METHOD

NO.

1

2

3

MEASURE POINT

MP 1

MP 2

MP 3

REMARK

-5VDC

-27VDC

5V

0V

T

5V

0V

T T: 250ns

2.6 VAC (DISPLAY FILAMENT VOLTAGE)

T: 16.67 ms (60 Hz)

WAVEFORM

-5V DC

-16V DC

-24V DC

REMARK

REPLACE Q4, EC2

REPLACE R6, EC3

REPLACE D12, D13, EC4

NOTE

: Each measure point must be measured with GND points.

38

2) Display prolems

NO.

CAUSE

1 Poor contact between

P.C.B and display filament.

MEASUREMENT

1. Check the voltage of PIN

1 & PIN 25.

2 The Display has some Refer to “The display troubles in its segment trouble shooting data”

3 Loss of vacuum in the display.

1

Stop

2 Quantity

Defrost

Weight Time


Display trouble shooting data

RESULT

2.6 VAC

REMEDY

Fix the Pin 1 &

25 on the

P.C.B.

Replace P.C.B.

assembly.

White Replace P.C.B

spot is generated on assembly.

the display

TROUBLE

TIME DEFROST, g do not come on

WEIGHT DEFROST, WATT do not come on.

QUANTITY does not come on

STAGE 2,AUTO COOK do not come on.

STAGE 1, LOCK do not come on.

DISPLAY NAME & PIN NO. MICOM OUTPUT IN PIN NO.

GRID 1 (G1), 21

GRID 2 (G2), 17

GRID 3 (G3), 14

GRID 4 (G4), 20

GRID 5 (G5), 4,7

10

6

3

2

1

SEGMENT, “a” does not come on from G1 to G5.

SEGMENT, “b” does not come on from G1 to G5.

SEGMENT, “c” does not come on from G1 to G5.

SEGMENT, “d” does not come on from G1 to G5.

SEGMENT, “e” does not come on from G1 to G5.

SEGMENT d, 19

SEGMENT e, 18

SEGMENT f, 16

SEGMENT a, 23

SEGMENT b, 22

SEGMENT, “f” does not come on from G1 to G5.

SEGMENT, “g” does not come on from G1 to G5.

SEGMENT c, 20

SEGMENT g, 15

DEFROST, QUANTITY, STAGE2, STAGE1 do not come on UPPER BAR l,5

LOCK, AUTO COOK, WATT, g do not come on LOWER BAR h,i,j,k,6,8,9,11

8

7

5

12

11

63

62

9

4

4) When there is not microwave oscillation.

(1) When pressing “ START ” button, oven lamp does not turn on.

Fan motor and turntable motor do not rotate, but cook indicator in display comes on.

* Cause : RELAY “2”does not operate.

Q12

A

MICOM

B

RY2 37

D9

-24V

39

MP1

MP2

MP3

Fig. 5 MEASUREMENT POINT

40

Fig. 5 MEASUREMENT POINT

41

CHECK METHOD

STAGE

RELAY “2” ON

RELAY “2” OFF

POINT

A

– 5VDC

GND

B

GND

–24VDC

(2) When pressing “ START ” button, oven lamp turn on.

Fan motor and turntable motor rotate and cook indicator in display comes on.

* Cause : RELAY “1”does not operate.

Q11

A

B

RY1

D8

MICOM

36

-24V

CHECK METHOD

STAGE

RELAY “2” ON

RELAY “2” OFF

POINT

A

– 5VDC

GND

B

GND

–24VDC

5) When the door is opened during operation, the count down timer does not stop.

A

C3

D.O.M

SW

R8

2

40

R7

R11 MICOM

B

1

-5V

CHECK METHOD

STAGE

1) DOOR OPENED

2) DOOR CLOSED

POINT

CHECK NO.

1

A

OPEN

CLOSED

METHOD

B

-5VDC

GND

Check the state (ON,OFF) of the secondary interlock switch by resistance measurement.

42

REMEDY

Replace secondary interlock switch

6) When the digital clock does not operate properly.

8

D12

D11

9

R27

D13

A

D10

D14

C8

B

R26

C6

R24

R23

Q8

C4

44

R21

C

-5V

MICOM

POINT

A

WAVEFORM

B

C

0V

-5V

T

If clock does not keep exact time, you must check Diode D10, transistor Q8.

T: 16.67 ms(60Hz)

43

2. P. C. B CIRCUIT DIAGRAM

1) PCB Circuit Diagram

44

3. COMPONENT INFORMATION

1) Transistor(NPN Type)

2) Diode and zener diode

Emitter

Collecftor

Base

DIODE Cathode (k)

ZENER DIODE Cathode (k)

ANODE(A) D1-16

ANODE(A) ZD1-6

45

4. PRINTED CIRCUITS BOARD

46

47

5. P.C.B LOCATION NO.

1) PCB PART LIST

5

6

7

8

3

4

NO

1

2

PART NAME SYMBOL

PCB MAIN M156

R CARBON FILM R6,R9,R10,R12,R17

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

R13

R24

R8,R21

R7,R23

R22

R5

9 R CARBON FILM

10 R CARBON FILM

11 R CARBON FILM

12 R CARBON FILM

13 R CARBON FILM

14 R CARBON FILM

16 R CARBON FILM

R1,R2

R3

R4

R11

R19,R20

R16,R18,R25

R14

30

31

32

33

24

25

26

27

28

29

17

18

19

20

C CERAMIC

C CERAMIC

C ARRRAY

DIODE ZENER

21 DIODE RECTIFIER

22 DIODE SWITCHING

23 DIODE ZENER

DIODE ZENER

DIODE ZENER

TR DIGITAL

TR DIGITAL

TRANSISTOR

TRANSISTOR

C ELECTRO

C ELECTRO

C ELECTRO

C ELECTRO

C1~C5,C7~C9

C6

CA1

D1~D5,D10

D8,D9,D11~D14

D6

ZD1,ZD5

ZD2

ZD3,ZD4

Q1, Q2, Q5

Q6, Q11, Q12

Q3, Q4, Q8

Q7

EC2, EC4

EC1

EC3, EC6

EC5

SPECIFICATION

M156

1/4W 1K

Ω

J

1/4W 100

Ω

J

1/4 10K

Ω

J

1/4W 4.7K

Ω

J

1/4W 100K

Ω

J

1/4W 2K

Ω

J

1/6W 1M

Ω

J

1/6W 100

Ω

J

1/6W 1K

Ω

J

1/6W 10K

Ω

J

1/6W 20K

Ω

J

1/2W 6.8

Ω

J

1/2W 470

Ω

J

1/2W 100

Ω

J

50V 0.1µF Z

50V 0.047µF Z

50V 1000PF(5P)

1N4148

1N4002A

1N4148M

MTZ3.9B

MTZ5.6B

MTZ24B

DTA114ES

KTRA106M

KTA1270Y

KTA1273Y

RS 50V 10µF

RS 25V 100µF

RSS 50V 220µF

RSS 50V 1000µF

48

CCKF1H473Z

CCKF1H104Z

CN4XB-102M

DZN4148---

DZN4002A--

DZN4148M---

DZTZ3R9B--

DZTZ5R6B--

DZTZ24B--

TDTA114ES-

TZRA106M--

TZTA1270Y-

TZTA1273Y-

CEXE1H100A

CEXE1E101A

CEXF1H221V

CEXF1H102V

PARTCODE

3514313851

RD-4Z102J-

RD-4Z101J-

RD-4Z103J-

RD-4Z472J-

RD-4Z104J-

RD-4Z202J-

RD-AZ105J-

RD-AZ101J-

RD-AZ102J-

RD-AZ103J-

RD-AZ203J-

RD-2Z689JS

RD-2Z471JS

RD-2Z101JS

2

1

2

1

3

3

3

1

1

2

1

6

8

1

6

1

2

1

1

2

1

2

3

1

Q'TY

1

5

2

2

1

1

1

1

45

46

47

41

42

43

44

37

38

39

40

NO

34

35

36

PART NAME

CONNECTOR

CONNECTOR

CONNECTOR

WIRE FLAT

IC MICOM

RESONATOR

BUZZER

SW RELAY

SW RELAY

TRANS POWER

DIGITRON

SYMBOL

CN1

CN2

CN3

IC1

CR1

BZ1

RY1

RY2

LVT1

DP1

SPECIFICATION

YW396-02V

HLEM15S-1

YW396-05AV

1.25X15X90XC

TMP47C862AN-GC17

KBR-40MKSTF

BM-20K

G5J-1-TP-M 24V

G5B-1 24V

DMR-814FS

SVM-05SS13

PARTCODE

3519150520

4CW215SBD0

3519150510

WSJ-159007

13GSR816T-

5PKBR40MKS

3515600100

5SC0101107

5SC0101109

5EPV035301

DSVM5SS13-

HOLDER VFD ” ˙ PP(BLACK) 3513002600

JUMPER WIRE J3~J7, J13~J17, J20~J25 1/0.52 TIN COATING 85801052GY(10MM)

JUMPER WIRE J1, J2, J10, J11, J12 1/0.52 TIN COATING 85801052GY(5MM)

1

16

5

1

1

1

1

1

1

1

1

Q'TY

1

1

1

2) SUB PCB PART LIST

5

6

3

4

NO

1

2

PART NAME

PCB SUB

LED

SWITCH TACT

SWITCH TACT

LED

SW ROTARY

SYMBOL

M157

L102

SW101~SW109

CN101

L101

EN101

7

8

9

R CARBON

C CERAMIC

COVER LED

R101~103

C101~104

SPECIFICATION

M157

SLR-34VR

KPT-1115AM

HLEM15R-1

DLY-5013T

SDB161PVB17F-

1-2-36-36PC(PITCH5)

1/4W 1K

Ω

J

50V 100PF Z

PP(NATURAL)

PARTCODE

3514313861

DSLR34VR--

5S50101Z93

4CW215RBD0

DLY-5013T-

5S10109002

RD-4Z102J-

CCZF1H102Z

3511404600

Q'TY

1

1

1

1

9

1

3

4

2

49

EXPLODED AND PARTS LIST

1. Door Assembly

A01 A02 A03 A04 A05 A06 A07

REF NO.

A01

A02

A03

A04

A05

A06

A07

A08

A09

A10

A11

PART NAME

FRAME DOOR

BARRIER-SCREEN

STOPPER HINGE

GASKET DOOR

HOOK

SPRING HOOK

HANDLE DOOR

SCREW TAPPING

ƒT

ƒT

DOOR PAINTING AS

BARRIER-SCREEN

T AS

ƒT I

O

SUPPORTER BARR-S ƒT O

PART CODE

3512202220

3512202020

3517003140

3517003040

3515304400

3515304600

3515201500

3511706520

3511706100

3517002900

3517002800

3512300400

3512300200

3513100710

3515101310

3512601200

3512601300

7S341W4OB1

A08

A09

A10

A11

DOOR AS : 3511708710 (KOR-816T)

3511707920 (KOR-616T)

PP

DESCRIPTION

ABS

ACRYLE 1.5T

ABS

KOR-6115OS

KOR-81250S

KOR-61150S

PE 0.1T

POM

HSW-3

ABS

T2S PAN 4X12 PW MFZN

Q’TY REMARK

KOR-816T

1

KOR-616T

1

KOR-816T

KOR-616T

1

KOR-816T

KOR-616T

1

1

1

1

KOR-816T

KOR-616T

KOR-816T

KOR-616T

KOR-816T

KOR-616T

1

1

1

KOR-816T

KOR-616T

2

50

2. Control Panel Ass’Y

B01 B02 B03 B04 B05

B06

B07

REF NO.

B01

B02

B03

B04

B05

B06

B07

B08

B09

B10

PART NAME

DECORATOR C-PANEL

C-PANEL

BUTTON START

BUTTON FUNCTION(COOK)

SCREW TAPPING

WINDOW DISPLAY

KNOB VOLUME

BUTTON FUNCTION

BUTTON FUNCTION(AUTO)

PCB AS

PART CODE

3511602100

3511602300

3516710930

3516713350

3516905800

3516905710

7621301011

3515500910

3515500810

3513403810

3516905600

3516905910

PKMPMSWJ00

PKMPMSUM00

B08 B09 B10

C-PANEL AS : PKCPSWWJ00 (KOR-816T)

PKCPSWUM00 (KOR-616T)

DESCRIPTION

ABS

ABS

ABS

ABS

T2S PAN 3X10 PW MFZN

PMMA

ABS

ABS

ABS

KOR-816T0A

KOR-616T0A

1

1

1

1

1

Q’TY REMARK

1

KOR-816T

KOR-616T

KOR-816T

1

1

1

KOR-616T

MILKY

9

1

KOR-816T

KOR-616T

51

F05

F04

F03

F02

F01

A00

B00

F40

F39

F37

3. MAIN UNIT

KOR-616T/816T0A

F05 F07 F08 F09 F10 F11 F12 F13 F14

F36 F35

F34

F33 F32 F31 F30

F29

F28 F27 F26

52

F15

F16

F17

F18

F19

F20

F21

F22

F23

F24

F25

KOR-616T1A

F42 F41

53

KOR-616T/816T0A

REF NO

F01

F02

PART NAME

COVER WAVE GUIDE

CAVITY AS

F23

F24

F25

F26

F27

F36

F37

F38

F39

B00

A00

F28

F29

F30

F31

F32

F33

F34

F35

F03

F04

F05

F06

F14

F15

F16

F17

F18

F19

F20

F21

F22

F07

F08

F09

F10

F11

F12

F13

COUPLER

GUIDE ROLLER AS

TRAY

CABINET

SCREW TAPPING

SCREW SPECIAL

SCREW TAPPING

CLAMP POWER AS

SCREW TAPPING

CORD POWER AS

MAGNETRON

SCREW SPECIAL

SCREW TAPPING

SCREW MACHINE

COVER * B

MOTOR SHADED POLE

FAN

SCREW TAPTITE

HOLDER HV CAPACITOR

CAPACITOR HV

DIODE HV

TRANS HV

SCREW SPECIAL

SCREW TAPPING

BASE

FOOT

SCREW TAPTITE

STOPPER HINGE * U

SCREW TAPPING

SW MICRO

SW MICRO

SW MICRO

LEVER LOCK

LOCK

LAMP

SCREW TAPPING

MOTOR SYNCRO

CONTROL-PANEL AS

DOOR AS

DESCRIPTION

PP

KOR-81150S

KOR-61150S

PPS

KOR-61150S

GLASS

PCM T0.6

T1 TRS 4X10 MFZN

TT3 HEX FG 4X8 MFZN

T2S TRS FG 4X12 MFZN

NYLON 66

T1 TRS 4X10 MFZN

3X0.75 60X60 160-RTML

2M218H(MF) I

T2 FG HEX 4X13 SE MFZN

T1 TRS 4X10 MFZN

PAN FLANGE 4X10 MFZN

SBHG T0.8

MW10XA-R01

PP + 30% GLASS

TT3 TRS 4X8 MFZN

SECC T0.8

2100VAC, 0.82µF

2100VAC, 0.70µF

HVR-1X-32B

DW-N80A1-81T

JY-N60A1-61T

TT3 HEX FG 4X8 MFZN

T1 TRS 4X10 MFZN

SBHG T0.8

PP DASF -130

TT3 TRS 4X8 MFZN

SCP-1 T2.5

T2S TRS 4X12 MFZN

VP-533A-OF

VP-532A-OF

VP-533A-OF

POM

POM

BL 125V 25W T25

T2S PAN 4X6 MFZN

GM-16-12F17

EXPLODED AND PART LIST


PART CODE

3516002700

7112401011

7S101W4081

3511402500

3963820110

3511800300

7272400811

3513001900

3518300800

441L267010

4416V24000

3518110700

3518110610

3516003700

7112401011

3510308900

3510308700

3512100900

7272400811

3511403200

3516105600

3516104800

3517400600

3512510600

3517203500

3517203600

3510801400

3510801300

7112401011

3516003700

7122401211

4413A90012

7112401011

35113NBND5

3518002200

3515201100

7122401211

4415A17352

4415A66600

4415A17352

3513701300

3513805710

3513601500

7121400611

3966820200

1

1

1

1

1

1

2

1

3

2

1

1

1

1

3

2

1

Q'TY

1

1

1

1

1

1

4

6

1

1

1

2

1

1

1

1

1

1

1

1

1

1

2

2

2

KOR-816T

KOR-616T

KOR-816T

KOR-616T

KOR-816T

KOR-616T

REMARK

KOR-816T

KOR-616T

KOR-816T

KOR-616T

KOR-816T

KOR-616T

54

KOR-616T1A

REF NO

F25

F26

F27

F28

F29

F30

F31

F32

F33

F34

F35

F17

F18

F19

F20

F21

F22

F23

F24

F36

F37

F38

F39

F40

F41

F42

B00

A00

F09

F10

F11

F12

F13

F14

F15

F16

F01

F02

F03

F04

F05

F06

F07

F08

PART NAME

COVER WAVE GUIDE

CAVITY AS

COUPLER

GUID ROLLER AS

TRAY

CABINET

SCREW TAPPING

SCREW SPECIAL

SCREW TAPPING

CLAMP POWER AS

SCREW TAPPING

CORD POWER AS

MAGNETRON

SCREW SPECIAL

SCREW TAPPING

SCREW MACHINE

COVER * B

MOTOR SHADED POLE

FAN

SCREW TAPTITE

HOLDER HV CAPACITOR

CAPACITOR HV

DIODE HV

TRANS HV

SCREW SPECIAL

SCREW TAPPING

BASE

FOOT

SCREW TAPTITE

STOPPER HINGE * U

SCREW TAPPING

SW MICRO

SW MICRO

SW MICRO

LEVER LOCK

LOCK

LAMP

FILTER NOISE

SCREW TAPPING

MOTOR SYNCRO

THERMOSTAT

SCREW TAPPING

CONTROL-PANEL AS

DOOR AS

PART CODE

3511402510

3963820110

3511800300

7272400811

3513001900

441L267010

4416V24000

3518110640

3516003700

7112401011

3510308700

3512100900

7272400811

3515201101

7122401211

4415A17352

4415A66600

4415A17352

3513701300

3511403200

3516104800

3517400600

3512510600

3517203600

3510801300

7S312X40A1

3516003700

7122401211

4413A90012

7112401011

35113NBND5

3518002200

3516002700

7S312X40A1

7S101W4081

3513805710

3513601500

3518603710

7121400611

3966820200

3518901700

7121300611

DESCRIPTION

PP

KOR-61150S

PPS

KOR-61150S

GLASS

PCM T0.6

T1 TRS 4X10 SE MFZN

TT3 HEX FG 4X8 MFZN

T2S TRS FG 4X12 MFZN

NYLON 66

T1 TRS 4X10 MFZN

3X0.75 60X60 160-RTML

2M218H(MF) I

T2 FG HEX 4X13 SE MFZN

T1 TRS 4X10 SE MFZN

PAN FLANGE 4X10 MFZN

SBHG T0.8

MW10XA-R01

PP + 30% GLASS

TT3 TRS 4X8 MFZN

SECC T0.8

2100VAC, 0.70µF

HVR-1X-32B

JY-N60A2-61T

TT3 HEX FG 4X8 MFZN

T1 TRS 4X10 MFZN

SBHG T0.8

PP DASF -130

TT3 TRS 4X8 MFZN

SCP-1 T2.5

T2S TRS 4X12 MFZN

VP-533A-OF

VP-532A-OF

VP-533A-OF

POM

POM

BL 125V 25W T25

DWLF-M02

T2S PAN 4X6 MFZN

GM-16-12F17

OFF:80 ON:50 H #187

T2S PAN 3X6 MFZN



Q'TY

2

1

1

1

1

1

1

1

2

4

6

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

2

2

1

3

1

1

1

1

3

2

1

1

1

1

1

1

REMARK

55

S/M NO. : R616T0A001

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 http://www.dwe. daewoo.co.kr

PRINTED DATE: Oct. 1998

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