Service manual

1) Transistor(NPN Type)
2) Diode and zener diode
5251
Emitter Collector
Q1 ~ Q12
Base
DIODE Cathode (K) ANODE (A) D1-15
ZENER DIODE Cathode (K) ANODE (A) ZD1-6
6) When the door is opened during operation, the count down timer does not stop.
CHECK METHOD
7) When the digital clock does not oeprate properly.
If clock does not keep exact time, you must check Diode D6, transistor Q2.
BL
BL
CN1
EARTH
TERMINAL
D.O.M
S/W
A
1
2
3
-5V
R10
C8
R11
B
-5V
40
MICOM
4
5
D12
D13
D10
D11
C15
D15
R1
R2
R9
Q2
C9
44
-5V
C7
AB
C
MICOM
POINT
AB
STAGE
1) DOOR OPENED OPEN -5VDC
2) DOOR CLOSED CLOSED GND
CHECK NO. METHOD REMEDY
1
Check the state (ON,OFF) of the secondary Replace secondary
Interlock switch by resistance measurement. interlock switch
POINT WAVEFORM
A
B
C
+5V
0V
T
T: 20 ms (50Hz)