s/m no. : daewoo electronics co., ltd. - Daewoo

s/m no. : daewoo electronics co., ltd. - Daewoo

S/M NO. :

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) 590-6291

TEL: 02) 360-7114/590-6151~5 http://www.dwe. daewoo.co.kr

PRINTED DATE: JUNE 1998

Service Manual

Microwave Oven

Model : KOG-366T0S

DAEWOO ELECTRONICS CO., LTD.

OVERSEAS SERVICE DEPT.

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 opened.

(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs if 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, and (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, integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.

(e) A microwave leakage check to verify compliance with the federal performance standard should be performed on each oven prior to release to the owner.

TABLE OF CONTENTS

PROPER USE AND SERVICE PRECAUTIONS.........................................................................................................2

SPECIFICATIONS........................................................................................................................................................3

FEATURES DIAGRAM ................................................................................................................................................4

EARTHING INSTRUCTIONS.......................................................................................................................................5

INSTALLATION ............................................................................................................................................................5

OPERATION PROCEDURE ........................................................................................................................................6

CONTROLS..................................................................................................................................................................7

INTERLOCK MECHINISM FUNCTIONS AND ADJUSTMENTS..............................................................................17

MEASUREMENT OF THE MICROWAVE OUTPUT POWER..................................................................................19

WIRING DIAGRAM ....................................................................................................................................................21

CIRCUIT DESCRIPTION ...........................................................................................................................................23

SAFTY PRECAUTIONS FOR DISASSEMBLY AND REPAIR .................................................................................26

DISASSEMBLY AND ASSEMBLY.............................................................................................................................27

TROUBLE SHOOTING GUIDE .................................................................................................................................33

KEYBOARD CHECK PROCEDURE .........................................................................................................................38

COMPONENT TEST PROCEDURE .........................................................................................................................39

SAFETY INTERLOCK CONTINUITY TEST..............................................................................................................40

PRINTED WIRING BOARD .......................................................................................................................................41

CIRCUIT CHECK PROCEDURE...............................................................................................................................41

P.C.B. CIRCUIT DIAGRAM........................................................................................................................................45

COMPONENT INFORMATION .................................................................................................................................46

PRINTED CIRCUITS BOARD....................................................................................................................................47

P.C.B. LOCATION NO ...............................................................................................................................................49

EXPLODED AND PARTS LIST .................................................................................................................................51

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 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 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 serivicing, a microwave emission check should be performed prior to servicing the oven.

(a) inform the manufacturer, importer or assembler,

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

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

(d) tell the owner of the unit not to use it until the oven has been brought into compliance.

3) If the oven operates with the door opened, the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately.

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE

FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS MIPROPERLY

USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE,

FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A

MICROWAVE ENERGY ABSORNING LOAD ATTACHED. NEVER LOOK INTO AN OPEN

WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

2

SPECIFICATIONS

ITEM

POWER SUPPLY

POWER

CONSUMPTION

MICROWAVE

GRILL

COMBINATION

MICROWAVE ENERGY OUTPUT

MICROWAVE FREQUENCY

OUTSIDE DIMENSIONS (W X H X D)

CAVITY DIMENSIONS (W X H X D)

NET WEIGHT

TIMER

FUNCTION SELECTIONS

MICROWAVE POWER LEVELS

* Specifications subject to change without notice.

SPECIFICATION

230V~50Hz, SINGLE PHASE WITH EARTHING

1200 W

1050 W

2200 W

800 W(IEC 705)

2450 MHz

465 X 274 X 379 mm

290X 200 X 290 mm

14.5 Kg

60 min

MICROWAVE/GRILL/COMBINATION

5 LEVELS

3

FEATURES DIAGRAM

1

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.

2

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

3

Oven cavity.

4

Spatter shield - Protects the microwave outlet from splashed of cooking foods.

5

Safety interlock system.

6

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

7

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

8

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

9

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

0 w

Function buttons - Used to select desired oven operation. : MICROWAVE, AUTOCOOK, DEFROST.

w

Grill / Combi button - Used to set the Grill or Combi mode.

e

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

r

Speedy cook button - Used to set desired time (It is incressed 30 seconds) t

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

y u

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

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

o

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

p

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

a

Reflector (Insulator Heater) s

Heating Element

d

Metal Rack

4

EARTHING INSTRUCTIONS

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of electric shock by providing an escape, wire for the electric current. This appliances 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.

CAUTION : Improper use of the earthing pulg can result in a risk of electric shock. consult an qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt extension to whether the appliance is properly earthed. If it necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3-slot receptacle that will accept the plug on the appliance. The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance.

INSTALLATION

1

Steady, flat location

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

This 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, 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.

osition 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 oven required a current of approximately 12 ampere. 230V 50Hz.

• Power supply cord is about 1.1 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 a 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:

QA misaligned door, broken door, 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.

5

OPERATION PROCEDURE

This section includes useful information about oven operation.

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

2. After placing the food in a suitable container, open the oven door and put it on the glass tray.

The glass tray must always be in place during cooking.

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

1

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

6

Time clock returns tol 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.

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.

3

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

4

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

8

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

5

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

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.

Touch Power pad,

Once the Touch

5

2

1

4

3

Power Level(Display)

800W

650W

450W

300W

140W

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 before 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.

TIME DEFROST

SETTING THE CONTROL

1. Press DEFROST button twice.

The display will show present time, and the colon strats blinking.

This digital clock allows you to set to

“10:10”.

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.

20:00 will show in the display.

NOTE : Time can be set up to

60 minutes.

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 200g to 3000g.

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

SETTING THE CONTROL

1. Press DEFROST button once.

The WEIGHT DEFROST indicator light will come on.

The g indicator light will start blinking.

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

For example : 1000g

3. Press button.

The 1000 will show in the display.

It is represent 1000g.

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

9

MICROWAVE

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 and 140W.

• It is displayed after and 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

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

For example : 10minutes.

3. Press button.

The M/W indicator light will light. The

WATT indicator light start blinking.

10:00 will show in the display.

NOTE : Time can be set up to

60 minutes.

The M/W indicator light will starts blinking to show the oven is in

MICROWAVE 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.

10

GRILL COOK

NOTE : • The heating element is located in the top of the oven.

• There is no pre-heating the oven for grilling. Place food inside the oven when setting the controls.

• The GRILL button is used with COMBI function.

• Whenever this button is pressed, display is changed to GRILL/COMBI mode.

• The setting time is increased if you are to turn right the DIAL KNOB.

• The setting time is decreased if you are to turn left the DIAL KNOB.

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

SETTING THE CONTROL

1. Press GRILL button once.

The GRILL indicator light will light.

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

For example : 25 minutes.

3. Press button.

25:00 will show in the display.

NOTE : Time can be set up to

30 minutes.

The GRILL indicator light will start blinking.

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.

11

COMBI COOK

NOTE : • Microwave and Grill operate simultaneously (or sequentially) in this mode.

• Whenever you press COMBI button, display is changed “0”, “: H”, “: L”,

• Therefore you can select power level of MICROWAVE.

SETTING THE CONTROL

1. Press COMBI button once again.

The corresponding COMBI indicators will light on the display.

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

For example : 10 minutes.

3. Press button.

10:00 will show in the display.

NOTE : Time can be set up to

30 minutes.

The COMBI indicator light will start blinking.

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 :

DISPLAY

: 0

: H

: L

POWER LEVEL

Approx. 450W

Approx. 550W

Approx. 350W

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 : Remove 10% for programmed time.

1. Press AUTO COOK button.

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.

“AC-2” will show in the display.

The quantity indicator light will start.

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.

5. Select the desired cooking quantity.

For example : 3(350g)

“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.

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

1

2

3

4

5

BEVERAGE

SOUP

CASSEROLE

VEGETABLE

FISH FILLET

QUANTITY NO

1 1CUP

2 2CUPS

3 3CUPS

1 250g

2 300g

3 350g

4 400g

1 200g

2 400g

3 600g

4 800g

1 250g

2 300g

3 350g

4 400g

1 300g

2 400g

3 500g

4 600g

5 700g

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 form 30 seconds to 5 minutes.

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

CHILD SAFETY LOCK

• The safety 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.

STAGE COMBINATIONS

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

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

• When you press START button, all indicators of setted functions are lighted, and 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 twice button during operation, the cooking instruction is all erased.

GENERAL COOKING HINTS

1. When cook a roast with an excess amount of dripping, it is helpful to remove the dripping 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 minimum 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 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.

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, and 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.

Adjustment 2

Interlock monitor switch

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

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

Secondary interlock switch

The movant 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 adjustments is completed.

e) Completely tighten the two mounting screws.

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

(4) Interlock switch replacement

Whenever safety interlock switches 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.

SYMBOL

RD

BL

WH

GY

BK

COLOR

RED

BLUE

WHITE

GRAY

BLACK

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.

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

4. Microwave power is switched on.

5. Heating time should be exactly 52 seconds.

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

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

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

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

P=4187X

T/t

T is actual temperature rise.

• t is the heating time.

The power measured should be 800W±10.0%

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±3.6F)

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 you 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 apperaciable microwave leakage from the unit under the test.

19

Procedure

A) Prepare Microwave Energy Survey Meter, 600cc glass breaker, glass thermometer100°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. 8.5 cm (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 4m W/cm 2 .

– When measuring the leakage, always use the 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,along the seam, the door viewing window, the exhaust air vents, 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.

– 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 closet than 2 inches from any metal.

If it does, erroneous reading may result.

20

WIRING DIAGRAM (GERMANY)

Fig. 1

21

WIRING DIAGRAM

Fig. 1-1

22

CIRCUIT DESCRIPTION

Refer to the “WIRING DIAGRAM” on page 21, 22.

MICROWAVE COOKING

TIME COOKING

1. When the food is placed inside 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 pad is touched.

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

1) 230VAC is applied to the high voltage transformer through the contacts of RELAY “1”.

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

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 capacitor of 16pF and the magnetron’s shielded case so that TV and radio programs are not impaired by noise.

23

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 “HI (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 in Fig. 3

24

POWER LEVEL

OUTPUT POWER

AGAINST FULL POWER

1 5/29

2 11/29

3

4

5

17/29

2329

29/29

RELAY “1” TURN ON, OFF TIME

Fig. 3

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 pad 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.

25

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 screwdriver which is attached to iron plate, and wear rubber gloves when servicing the high voltage side.

(3) Warning about the electric charge in the high voltage capacitor. When inspecting and repairing the high voltage side, always short the capacitor terminals and make sure of discharge.

1. Check the grounding.

Do not operate on a 2-wire extension cord.

The microwave oven is designed to be used when grounded.

It is imperative, therefore, to makes sure it is grounded properly before before beginning repair work.

2. Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation stops, 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 screw driver to discharge.

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

Refer to 17~18 page for the necessary adjustment.

(5) After repair or replacement of parts, make sure that the screw 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.

WARNING :

When servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock of exposing microwave. These parts are as follows–H.V.

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

26

DISASSEMBLY AND ASSEMBLY

1. To remove cabinet.

Remove three screws (F09) on cabinet back.

2. To remove door assembly.

1) Remove two screws

1 which secure the stopper hinge top.

2) Remove the stopper hinge top

2 and door assembly

3 from top plate of cavity.

3) Remove the stopper hinge top

2 from door assembly.

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

NOTE:

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

3. To remove door parts.

F09

27

(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) Remove the handle door(A10) from the door frame(A01).

(8) Reverse the above steps for reassembly.

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 hinge stopper, and then push the door to contact the door seal to oven front surface.

2) Tighten two screws.

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

1) Loosen two screws in under hinge stopper, and then the door to contact the door seal to oven front surface.

2) Tighten two 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 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).

NOTE:

A small gap may be acceptable if the microwave leakage does not exceed 4m W/cm

2

.

28

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.

(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) Remove the window display (B06) from the decorator panel (B01).

(8) Reverse the above steps for reassembly.

29

6. To remove high voltage capacitor.

(1) Remove a screws

1 which secure the grounding ring terminal of the H.V. diode

2 and the capacitor holder

3

.

(2) Remove the H.V. diode

2 from the capacitor holder

3

.

(3) Remove the above steps for reassembly.

High voltage circuit wiring

7. To remove magnetron.

(1) Remove three screws

1 which secure the magnetron

2

.

(2) Remove the magnetron

2

.

(3) Reverse the above steps for reassembly.

30

CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave.

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.

8. To remove fan motor assembly.

(1) Remove two screws

(2) Remove two screws

(3) Pull out the fan

5

1

1 which secure the back cover which secure the fan motor from the motor

4

.

4

2 from the cavity outer.

from the back cover

2

.

(4) Remove the above steps for reassembly.

9. To remove transformer.

(1) Remove the four screws

1 holding the H.V.

transformer

2

.

(2) Remove the transformer

2

.

(3) Reverse the above steps for reassembly.

31

10. To remove insulator Heater assembly.

(1) Remove the four HEX Nuts

1

.

(2) Remove the Iinsulator Heater assembly

2

.

(3) Reverse the above steps for reassembly.

11. To remove Heater Part.

NO PART NAME

1

INSULATOR HEATER

2

HEATER

3

SCREW MACHINE

4

NUT HEX

5

SCREW MACHINE

6

7

SPACER INSULATOR *I

NUT HEX

PART CODE

3513301100

3512801700

7002500613

7392500008

7002400413

3515000700

7392500011

(1) Remove the HEX Nut

4

.

(2) Remove the Insulator Heater

1 and Heater

2

.

(3) Remove the two screws

5

.

(4) Reverse the above steps for reassembly.

Q’TY

1

1

2

1

1

2

2

DESCRIPTION

SPP T0.8

230V 1000W

TRS 5X6 MFCR

6N-2-5 SUS

TRS 4X4 MFCR

C3771BD

6N-2-5 MFZN

REMARK

32

TROUBLE SHOOTING GUIDE

Following the procedures 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 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 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 and 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 and 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.

33

(TROUBLE2) Oven does not operate at all; any inputs can not be acceted.

Condition

Fuse blows

Check

Check continuity of interlock monitor switch with door closed.

(COM NC)

Result

(COM NC)

Continuity

Cause

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

Check continuity of primary winding of low lvoltage transformer.

O

Ω or infinite

Approx 90-

120

(norm al)

Replace Low

Voltage

Transformer

Replace

NOTE 1

Replace

Disconnect high voltage fuse and operate the unit

Fuse again bolows

Defective high voltage transformer

Replace

34

Condition

Outlet has proper Voltage

Fuse does not open

Check

Check continuity both magnetron and heater thermostat

Result

No

Continuity

Cause

Defective magnetion and heater thermostat

Remedy

Replace

Check continuity of noise filter board

No

Continuity

Defective line filter borard

Replace

Check continuity of power supply cord.

No

Continuity

Open power supply cord

Replace

Normal

Defective touch control circuit

Replace

NOTE 1 :

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

(TROUBLE3) Display shows all figures selectdd, but oven does not start cooking, even though desired program and time are set and start button is tapped.

Condition

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

Check

Check continuity of promary interlock switch

Result

No

Continuity

Cause

Malfunction of

Primary interlock switch

Remedy

Adjust or replace

Check continuity of secondary interlock and

D.O.M. switch

Check D.C.

voltage being supplied to

RELAY(RY2) coil.

No

Continuity

0V

Malfunction of secondary interlock and

D.O.M switch

Defective touch control circuit

Adjust or replace

Replace

Approx.

-16V DC

Faulty contacts of RELAY

(RY2) open relay coil

Replace

35

(TROUBLE4) No microwave oscillation even though fan motor rotates.

Cause

Condition

No microwave oscillation

Check

Check continuity of high voltage fuse

Check continuity of high voltage capacitor terminals with wires removed

Check continuity of high voltage recitifier in forword and backward direcion with DC meggr

Result

No continuity

Continuity

Continuity inbackward direction

Defective high voltage transformer

Defective high voltage voltage rectifier

Continuity Defective magnetron

Connect megger leads to magentron terminal and magnetron body

Check resistance of primary and secondary coil of high voltage transformer

Check continuity of magnetron heater with wires removed

Check continuity of filament terminal of high voltage transformer

0 or

No continuity

No continuity

Defective high voltage transformer

Defective high voltage transformer

Defective high voltage transformer

Check D.C.

voltage being supplied to

RELAY (RY1) coil

0V Defective touch control circuit

Approx

-16V DC

Faulty contacts of

RELAY(RY1) or open relay coil

Remedy

Replace

Replace

Replace

Replace

Replace

Replace

Replace

Replace

36

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

Cause

Malfunction of touch control circuity of control box main-assembly

Remedy

Replace control box main assembly

Normal Malfunction of touch control circuitry of control box sub-assembly

Replace control box subassembly

NOTE 1 :

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.

(TROUBLE5) Heater does not heat(Food will not become hot).

Condition Check Result

Cause

Grill heater does not heat

Check continuity both primary interlock switch

No

Continuity

Malfunction of primary interlock switch

Check continuity of heater thermostat

No

Continuity

Defective heater thermostat

Check continuity of secondary interlock switch

No

Continuity

Malfunction of secondary interlock switch

Check continuity of heater

No

Continuity

Defective heater

Remedy

Adjust or replace

Replace the heater thermostat

Adjust or replace

Replace

OV

Replace

Check D.C.

voltage being supplied to

RELAY (RY3) coil.

Approx

-24V DC

Defective touch control circuit

Faulty contacts of RELAY(RY3) or open relay coil.

Replace

37

KEYBOARD CHECK PROCEDURE

1. Type of encoding and key names.

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 7and 11

7) START button : Between 8 and 11

8) AUTO COOK button : Between 12 and 11

9) GRILL/COMBI button : Between 14 and 11

38

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 26).

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

±10%

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

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

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

.

(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 again 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.

A normal diodes resistance will be infinite in one direction and several hundred K

Ω in the 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.

39

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, Fig. c for tests.

1) In case of interlock monitor check.

(Lamp on or zero resistance)

2) In case of primary interlock check.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. a –

Condition: 1) Door is opened.

2) Common terminal of the monitor switch disconnected.

(ohmmeter)

– Fig. b –

Condition: 1) Door is closed.

3) In case of secondary interlock switch.

* (Schematic diagram of S/W tester)

(ohmmeter)

– Fig. c –

Condition : 1) Door is closed.

40

PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE

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

The low voltage transformer is located on the P.C.B.

Measuring condition: Input voltage : 230V

Frequency: 50Hz

Terminal

C-D

E-F

Voltage

LOAD

-19VDC

2.1VDC

NO LOAD

-24VDC

2.2VAC

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 nominal voltage.

2) Voltage Check

Key check point (MICOM PIN)

NO.

1

2

CHECK POINT

PIN 21,24,32,33 OR 34

PIN 48

3 PIN 44

-5VDC

-27VDC

REMARK

T:20ms (50HZ)

4

5

PIN 18 OR 19

DP1 PIN 1& 25

CHECK METHOD

NO.

1

2

3

MEASURE POINT

MP1

MP2

MP3

2.6VAC (DISPLAY FILAMENT VOLTAGE)

WAVE FORM

-5V DC

-16V DC

-24V DC

NOTE: Each measure point must be measured with GND points.

REMARK

Replace Q4, EC2

Replace R6, EC3

Replace D12, D13, EC4

41

3) Display problems

NO.

1

CAUSE MEASUREMENT

Poor contact between Check the voltage

P.C.B. and display of PIN 1 & PIN 25.

filament.

2

3

The Display has some Refer to “The display troubles in its segment.

trouble shooting data” below.

Loss of vacuum in the display

White spot

RESULT

2.6 VAC

White spot is generated on the display

REMEDY

Fix the PIN 1 & 25 on the P.C.B.

Replace P.C.B.

assembly.

Replace P.C.B.

assembly

Display trouble shooting data

TROUBLE

TIME DEFROST, g do not come on

WEIGHT DEFROST, WATT do not come on.

COMBI does not come on

GRILL, AUTO COOK do not come on.

M/W, LOCK do not come on.

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

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

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

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

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

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

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

DEFROST, COMBI, GRILL, M/W do not come on.

LOCK, AUTO COOK, WATT, g do not come on.

DISPLAY NAME

& PIN NO.

GRID 1(G1), 21

GRID 2(G2), 17

GRID 3(G3), 14

GRID 4(G4), 20

GRID 5(G5), 4, 7

SEGMENT d, 19

SEGMENT e, 18

SEGMENT f, 16

SEGMENT a, 23

SEGMENT b, 22

SEGMENT c, 20

SEGMENT g, 15

UPPER BAR l,5

LOWER BAR h,i,j,k,6,8,9,11

MICOM OUTPUT

IN PIN NO.

12

11

9

4

7

5

1

8

63

62

10

6

3

2

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

42

CHECK METHOD

STAGE

RELAY “2” ON

RELAY “2” OFF

POINT

A

-5VDC

GND

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

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

* Cause: RELAY “1” does not operate.

B

GND

-24VDC

CHECK METHOD

STAGE

RELAY “2” ON

RELAY “2” OFF

POINT

A

-5VDC

GND

5) When there is not Grill heat.

When pressing “START” button, oven lamp turns on.

Fan motor and turntable and cook indicator in display comes on

* Cause: RELAY “3” does not operate.

B

GND

-24VDC

CHECK METHOD

STAGE

RELAY “3” ON

RELAY “3” OFF

POINT

A

-5VDC

GND

43

B

GND

-24VDC

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

CHECK METHOD

POINT

STAGE

1) DOOR OPENED

2) DOOR CLOSED

NO.

1

A

OPEN

CLOSED

METHOD

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

7) When the digital clock does not operate properly.

B

-5VDC

GND

REMEDY

Replace secondary interlock switch

POINT

A

B

WAVEFORM

C

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

44

2. P.C.B Circuit Diagram

45

3. COMPONENT INFORMATION

1) Transistor (NPN Type)

2) Diode and Zener Diode

D1-16

ZD1-6

46

4. PRINTED CIRCUITS BOARD

47

48

PRINTED LOCATION NO.

NO PART NAME SYMBOL

4

5

6

7

1

2

3

PCB MAIN

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

R CARBON FILM

8

9

R CARBON FILM

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

17 C CERAMIC

18 C CERAMIC

19 C ARRAY

20 DIODE ZENER

C1~C5, C7~C9

C6

CA1

D1~D5, D10

21 DIODE RECTIFIER D8, D9, D11~D14

22 DIODE SWITCHING D6

23 DIODE ZENER

24 DIODE ZENER

ZD1, ZD5

ZD2

25 DIODE ZENER

26 TR DIGITAL

27 TR DIGITAL

28 TRANSISTOR

29 TRANSISTOR

30 C ELECTRO

31 C ELECTRO

32 C ELECTRO

33 C ELECTRO

ZD3, ZD4

Q1, Q2, Q5

Q6, Q11, Q12

Q3, Q4, Q8

Q7

EC2, EC4

EC1

EC3, EC6

EC5

M156

R6, R9, R10, R12, R17

R13

R24

R8, R21

R7, R23

R22

R5

R1, R2

R3

R4

R11

R19, R20

R16, R18, R25

R14

SPECIFICATION

M156

1/4W 1K

J

1/4W 100

J

1/4 10K

J

1/4W 4.7K

J

1/4W 100K

J

1/4W 2K

J

1/6W 1M

J

1/6W 100

J

1/6W 1K

J

1/6W 10K

J

1/6W 20K

J

1/2W 6.8

J

1/2W 470

J

1/2W 100

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

PARTCODE

CCKF1H473Z

CCKF1H104Z

CN4XB-102M

DZN4148-

DZN4002A-

DZN4148M-

DZTZ3R9B-

DZTZ5R6B-

DZTZ24B-

TDTA114ES-

TZRA106M

TZTA1270Y-

TZTA1273Y-

CEXE1H100A

CEXE1E101A

CEXF1H221V

CEXF1H102V

3514313851

RD-4Z102J-

RD-4Z101J-

RD-4Z103J-

RD-4Z472J-

RD-4Z104J-

RD-4Z202J-

RD-A4Z105J-

RD-AZ101J-

RD-AZ102J-

RD-AZ103J-

RD-AZ203J-

RD-2Z689JS

RD-2Z471JS

RD-2Z101JS

Q’TY

1

2

1

1

2

2

3

3

3

6

1

2

1

8

1

1

6

1

2

3

1

1

2

1

1

1

2

2

1

1

5

1

49

NO PART NAME

34 CONNECTOR

35 CONNECTOR

36 CONNECTOR

37 WIRE FLAT

38 IC MICOM

39 RESONATOR

40 BUZZER

41 SW RELAY

42 SW RELAY

43 TRANS POWER

44 DIGITRON

45 HOLDER VFD

46 JUMPER WIRE

47 JUMPER WIRE

SYMBOL SPECIFICATION PARTCODE

CN1

CN2

CN3

YW396-02V

HLEM15S-1

YW396-05AV

1.25X15X90XC

TMP47C862AN-GC17

3519150520

4CW215SBD0

3519150510

WSJ-159007

13GSR816TIC1

CR1

BZ1

RY1

RY2

LVT1

DP1

KBR-40MKSTF

BM-20K

G5J-1-TP-M 24V

G5B- 24V

5PKBR40MKS

3515600100

5SC0101107

5SC0101109

DMR-814FS

SVM-05SS13

5EPV035301

DSVM5SS13-

PP(BLACK) 3513002600

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

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

Q’TY

1

1

1

1

1

1

1

1

1

1

16

5

1

1

2) SUB PCB PART LIST

NO

4

5

6

1

2

3

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

J

50V 100PF Z

PP(NATURAL)

PARTCODE

3514313861

DSLR34VR-

5S50101Z93

4CW215RBD0

DLY-5013T-

5S10109002

RD-4Z102J-

CCZF1H102Z

3511404600

Q’TY

1

1

1

1

1

9

3

4

2

50

EXPLODED AND PARTS LIST

1. Door Assembly

DOOR AS : 3511707920

NO.

PART NAME

A01 FRAME DOOR

A02 BARRIER-SCREEN*O

A03 SUPPORTER BARRI-S*O

A04 STOPPER HINGE*T

A05 DOOR PAINTING AS

A06 BARRIER-SCREEN*I

A07 GASKET DOOR

A08 HOOK

A09 SPRING HOOK

A10 HANDLE DOOR

A11 SCREW TAPPING

PART CODE

3512202020

3517003040

3515304600

3515201500

3511706100

3517002800

3512300200

3513100710

3515101500

3512601300

7S341W40B1

DESCRIPTION

ABS

ACRYLE 1.5T

ABS

KOR-61150S

KOR-61150S

PE 0.1T

PP

POM

PW1

ABS

T2S PAN 4X12 PW MFZN

1

1

1

1

2

Q’TY REMARKS

1

1

1

1

1

1

51

2. Control Panel Assembly

C-PANEL AS : PKCPSWSZ00

NO.

PART NAME

B01 DECORATOR C-PANEL

B02 C-PANEL

B03 BUTTON START

B04 BUTTON FUNCTION(COOK)

B05 SCREW TAPPING

B06 WINDOW DISPLAY

B07 KNOB VOLUME

B08 BUTTON FUNCTION

B09 BUTTON FUNCTION(AUTO)

B10 PCB MAIN MANUAL AS

PART CODE

3511602300

3516710730

3516905800

3516905700

7621301011

3515500810

3513403810

3516905600

3516905900

PKMPMSSZ00

DESCRIPTION

ABS

ABS

ABS

ABS

T2S PAN 3X10 PW MFZN

PMMA

ABS

ABS

ABS

KOG-366TOS

1

1

1

1

8

1

1

1

Q’TY REMARKS

1

1

MILKY

SMOG

52

3. Main Unit

53

TAPPING

TAPPING

TAPPING

7112401011

3516003700 3 FLG

7112401011

7112401011

TAPPING

3516002700

7112401011

TAPTITE 7272400811

3

TAPPING

TAPTITE

TAPPING

3516003700

7112401011

3

7272400811

7122401211

3

TRS

Z

Z

54

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