Minolta Di 620 Manual page 292

22) The Copier Does not Turn ON
Power Switch S1
Lower Front Door Interlock Switch S2
Right Door Interlock Switch S3
Upper Left Door Interlock Switch S4
Lower Left Door Interlock Switch S5
Symptom Step
RY1 does 1 Is there an AC power supply voltage
not turn across PJ1PU-1 and 3 on PU1?
ON.
2 Is the voltage across PJ2PU-1/-2/-3
on PU1 and GND DC24V?
3 Is the voltage across PJ11C-4 on
PWB-C and GND DC24V when S1
is OFF?
4 Is the voltage across PJ11C-2/-3 on
PWB-C and GND DC24V when S1
is ON?
5 Is the voltage across PJ5PU-5 on
PU1 and GND DC5V when S1 is
ON?
Relevant Electrical Parts
DC Power Supply PU1
Master Board PWB-A
Power Supply Board PWB-C
Noise Filter Board PWB-D
Check Item
T-77
Result
NO Check the circuit breaker and power
supply voltage. If they are okay,
change PWB-D.
NO Check the fuse on PU1 and, if it is
intact, change PU1.
NO Change PWB-C.
NO Check S1, S2, and S3.
YES Check RY1.
NO Change PWB-A or PU1.
Action