Daewoo KOR-164H0A Service Manual page 28

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.
- Check m ethod
STATE
RELA Y 2 O N
RELA Y 2 O F F
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.
- Check m ethod
STATE
R ELA Y 1 O N
RELA Y 1 O FF
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
STATE
1) DO O R O P E N
2) D O O R C LO S E D
CHECK N O
C heck the stage(O N,O FF ) of the secondary interlock switch by resistance
1
m easurem ent.
5. W hen the digital clock does not operate properly.
refer to Circuit Diagram ( Point 5 )
POINT
A
If clock does not keep exact tim e, you m ust check resistor R15,16, zener diodeZD1.
refer to Circuit Diagram ( Point 3)
POINT
refer to Circuit Diagram ( Point 2 )
POINT
PO INT
METHOD
T: 16.67 m s(60H z)
A
- 5V DC
G N D
A
-5VD C
G ND
A
O P EN
C LO SE
WAVE FORM
27
B
G N D
- 12V DC
B
G ND
-12VD C
B
-5V DC
G N D
REM EDY
Replace secondary interlock switch.