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MICROWAVE OVEN

Troubleshooting & Technical Data

6-8

PROCEDURE

LETTER

COMPONENT TEST

TEST PROCEDURES

J

(CONTINUED)

4.

The corresponding segments of all digits do not light up; or they continue to light up.

5.

Wrong figure appears.

6.

A certain group of indicators do not light up.

7.

The figure of all digits flicker.

8.

The following symptoms indicate a defective LSI unit.
a.

When touching the keys on the touch screen, a certain key produces no signal at all.

b.

When touching a number key on the touch screen, two figures or more are displayed.

c.

When touching the keys on the touch screen, sometimes a key produces no signal.

c. Other possible problems caused by defective control unit.

1.

Buzzer does not sound or continues to sound.

2.

Clock does not operate properly.

3.

Cooking is not possible.

When testing is completed:

1.

Disconnect power supply cord and remove outer cabinet case.

2.

Open door and block it open.

3.

Discharge high-voltage capacitor.

4.

Reconnect all leads removed from components during testing.

5.

Reinstall the outer cabinet case, then reconnect power supply cord.

6.

Run the oven and check all functions.

KEY UNIT TEST

1.

Disconnect power supply cord and remove outer cabinet case.

2.

Open door and block it open.

3.

Discharge high-voltage capacitor.

4.

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is mak-
ing good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are
closed when the door is closed and open when the door is open.  If the door sensing switch (stop switch) is
good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door
sensing switch is closed (either close the door or short the door sensing switch connecter).  Use the Key
unit matrix indicated on the control panel schematic and place a jumper wire between the pins that corre-
spond to the STOP/CLEAR pad making momentary contact.  If the control unit responds by clearing with a
beep the key unit is faulty and must be replaced.  If the control unit does not respond, it is faulty and must
be replaced.  If a specific pad does not respond, the above method may be used (after clearing the control
unit) to determine if the control unit or key pad is at fault.

5.

Reconnect all leads removed from components during testing.

6.

Reinstall the outer cabinet case, then reconnect power supply cord.

7.

Run the oven and check all functions.

P

P

P

P

rr

rr

ii

ii

o

o

o

o

rr

rr

  

  

tt

tt

o

o

o

o

  

  

S

S

S

S

e

e

e

e

rr

rr

ii

ii

a

a

a

a

ll

ll

  

  

N

N

N

N

u

u

u

u

m

m

m

m

b

b

b

b

e

e

e

e

rr

rr

  

  

1

1

1

1

2

2

2

2

0

0

0

0

0

0

0

0

1

1

1

1

5

5

5

5

4

4

4

4

G 1

G 2

G 3

G 4

G 5

G 6

G 7

G 8

G 9

G10

G11

G12

G13

G14

FRESH

VEGETABLES

BEVERAGE

BREAKFAST

 

LUNCH

 

POPCORN

FROZEN
SNACKS

 

RECIPES

QUICK ON/

START

FISH

SEAFOOD

POWER

LEVEL

KEEP

WARM

DINNER

 

DEFROST

HELP

 

BAKED

POTATOES

SENSOR

REHEAT

ADD

MINUTE

FROZEN

VEGTABLES

RICE

1

6

2

7

3

8

4

9

5

0

POULTRY

GROUND

MEAT

FROZEN

ENTREES

TIMER/
CLOCK

STOP

CLEAR

Содержание 1200154

Страница 1: ...EC TRICAL CIRCUIT WITH HANDS OR UNINSULATED TOOLS WHILE THE POWER IS CONNECTED BEFORE SERVICING THE MICROWAVE OVEN THE CAPACITOR MUST BE DISCHARGED BY SHORTING THE CONNECTING LEAD OF THE RECTIFIER AGAINST THE CHASSIS WITH AN INSULATED SCREW DRIVER FAILURE TO FOLLOW THIS STEP COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH NOTE THE CAPACITOR REMAINS CHARGED APPROXIMATELY 60 SECONDS AFTER THE OVEN ...

Страница 2: ...nto cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is produced in oven load food Oven does not cook properly when programmed for Cooking Power 5 mode Operates properly on Cooking Power 10 HIGH mode Oven goes into...

Страница 3: ...selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water t...

Страница 4: ...testing 6 Reinstall the outer cabinet case then reconnect power supply cord 7 Run the oven and check all functions CAVITY TEMPERATURE FUSE TEST 1 Disconnect power supply cord and remove outer cabinet case 2 Open door and block it open 3 Discharge high voltage capacitor 4 A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the c...

Страница 5: ...and remove outer cabinet case 2 Open door and block it open 3 Discharge high voltage capacitor 4 Disconnect wire leads from the male tab terminals of Primary Interlock Relay Check the state of the relay contacts with an ohmmeter contacts should be open If contacts are closed replace entire circuit board 5 Reconnect all leads removed from components during testing 6 Reinstall the outer cabinet case...

Страница 6: ...onnect the power supply cord KEY UNIT 1 Disconnect power supply cord and remove outer cabinet case 2 Open door and block it open 3 Discharge high voltage capacitor 4 Check Key Unit ribbon connection before replacement 5 Reconnect all leads removed from components during testing 6 Reinstall the outer cabinet case then reconnect power supply cord 7 Run the oven and check all functions The following ...

Страница 7: ...that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed either close the door or short the door sensing switch connecter Use the Key un...

Страница 8: ...Disconnect power supply cord and remove outer cabinet case 8 Open door and block it open 9 Discharge high voltage capacitor 10 Reconnect all leads removed from components during testing 11 Reinstall the outer cabinet case then reconnect power supply cord 12 Run the oven and check all functions COMPU DEFROST TEST WARNING THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE PERFORMING THE FOLLOWING PRO CEDURE ...

Страница 9: ...pen door and block it open c Discharge high voltage capacitor d Disconnect the leads to the primary of the power transformer and ensure that these leads remain isolat ed from other components and oven chassis by using insulation tape e After that procedure re connect the power supply cord f Follow steps on troubleshooting table below for repair g Disconnect power supply cord and remove outer cabin...

Страница 10: ...ews tightened 1 The oven should be plugged in at least two minutes before sensor cooking 2 Fill approximately 200 milliliters 7 2 oz of tap water in 1000 milliliters measuring cup 3 Place the container on center of tray in the oven cavity 4 Close the door 5 Touch the Timer Clock pad once the Power Level pad twice the Start pad once and the Number pad once The oven is now in sensor cooking conditio...

Страница 11: ...y 25 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH sensor d After approximately 3 seconds the display shows xx xx which is remaining cooking time and the dis play count down 1 If the above is not the case the control unit is probably defective 2 If the above is proper the AH sensor is probably defective 10 Disconnect power supply cord and r...

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