PRINTED CIRCUIT BOARD
3. W hen there is no microwave oscillation
1) W hen touching START pad, oven lam p does not turn on.
Fan m otor do not rotate, but cook indicator in display com es on.
Cause : RELAY 2 does not operate.
refer to Circuit Diagram ( Point 3)
- Check m ethod
2) W hen touching START pad, oven lam p turns on.
Fan m otor and turntable rotate and cook indicator in display com es on.
Cause : RELAY 1 does not operate.
refer to Circuit Diagram ( Point 2 )
- Check m ethod
4. W hen the door is opened during operation, the count down timer does not stop.
refer to Circuit Diagram ( Point 1 )
- Check m ethod
5. W hen the digital clock does not operate properly.
refer to Circuit Diagram ( Point 5 )
If clock does not keep exact tim e, you m ust check resistor R15,16, zener diodeZD1.
POINT
STATE
A
B
RE LA Y 2 O N
- 5V D C
G N D
RE LA Y 2 O F F
G N D
- 1 2 V D C
P OINT
STATE
A
B
R E LA Y 1 O N
-5VD C
G N D
RE LA Y 1 O FF
G N D
-1 2 VD C
PO INT
STATE
A
B
1) D O O R O P E N
O P EN
-5V D C
2) D O O R C LO S E D
C LO SE
G N D
CHECK N O
METHOD
REM EDY
1
C heck the stage(O N ,O F F) of the door open m onitor sw itch by resistance
m easurem ent.
R eplace door open m onitor sw itch.
POINT
W AVE FORM
A
T: 20 m s(50H z)
