36
3. Case of no microwave oscillation
1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in
display comes on.
*Cause: RELAY 1 does not operate.
2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator
in display comes on.
*Cause: RELAY 1 does not operate.
3) When touching M/W button, oven lamp turn on and turns on and fan motor does not rotate but cook indicator in
display comes on.
*Cause: RELAY 5 does not operate.
STATE
RELAY 1 ON
RELAY 1 OFF
POINT A
+5V DC
GND
POINT B
GND
+24V DC
M/W
D7
(KOC-922T9S/R)
D8
(KOC-923T9S/R)
Q4(KOC-922T9S/R)
Q5(KOC-923T9S/R)
B
A
RY1
16(KOC-922T9S/R)
30(KOC-923T9S/R)
STATE
RELAY 4 ON
RELAY 4 OFF
POINT A
+5V DC
GND
POINT B
GND
+24V DC
LAMP
TRAY
B
A
RY4
D11
(KOC-922T9S/R)
D12
(KOC-923T9S/R)
Q7(KOC-922T9S/R)
Q9(KOC-923T9S/R)
23(KOC-922T9S/R)
34(KOC-923T9S/R)
STATE
RELAY 5 ON
RELAY 5 OFF
POINT A
+5V DC
GND
POINT B
GND
+24V DC
FAN
B
A
RY5
D15
(KOC-922T9S/R)
D14
(KOC-923T9S/R)
Q8(KOC-922T9S/R)
Q10(KOC-923T9S/R)
24(KOC-922T9S/R)
35(KOC-923T9S/R)
