PRINTED CIRCUIT BOARD

3. W hen there is no microwave oscillation

1)W hen touching START pad, oven lamp does not turn on.

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

Cause : RELAY 2 does not operate. ￿refer to Circuit Diagram ( Point 3) - Check method

 

POINT

A

B

STATE

 

 

 

 

RELAY 2 O N

 

- 5V DC

G N D

 

 

 

 

RELAY 2 O FF

 

G N D

- 12V DC

 

 

 

 

2)W hen touching START pad, oven lamp turns on.

￿Fan motor and turntable rotate and cook indicator in display comes on. Cause : RELAY 1 does not operate. ￿refer to Circuit Diagram ( Point 2 )

- Check method

 

POINT

A

B

STATE

 

 

 

 

RELAY 1 O N

 

-5VD C

G ND

 

 

 

 

RELAY 1 O FF

 

G ND

-12VD C

 

 

 

 

4. W￿hen the door is opened during operation, the count down timer does not stop.

refer to Circuit Diagram( Point 1 )

- Check method

 

POINT

A

B

STATE

 

 

 

 

1) DO O R OP E N

 

O P EN

-5V DC

 

 

 

 

2) D OO R C LO S E D

 

C LO SE

G N D

 

 

 

 

CHECK NO

METHOD

REM EDY

1

C heck the stage(ON,OFF) of the door open m onitor switch by resistance

Replace door open m onitor sw itch .

m easurem ent.

 

 

 

 

 

 

5. W￿hen the digital clock does not operate properly.

￿refer to Circuit Diagram( Point 5 )

If clock does not keep exact time, you must check resistor￿￿R15,16, zener diodeZD1.

POINT

WAVE FORM

A

T: 16 .67m s(60H z)

Page 29
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Daewoo KOR-631H0P, KOR-631G0P Hen touching Start pad, oven lamp turns on, Refer to Circuit Diagram Point Check method

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