Minolta EP5000 General, Mechanical/Electrical page 381

Interleaf EP5000/EP4000 TROUBLESHOOTING
97.04.01
1156SBT040302A
2) Main Relay Turns ON But the Control Panel Gives No Display.
D Power Supply Unit PU1
D Control Panel UN1
Step Check Item
Is the voltage across PJ22-2 on PU1
and GND DC5V?
1
Is the voltage across PJ21-2 on PU1
and GND DC5V?
2
Is the voltage across PJ3C-1 on PWB-
C and GND DC24V?
3
Is the connection between PWB-B and
UN1 normal?
4
Relevant Electrical Parts
D MSC Board PWB-B
D Power Supply Board PWB-C
Result
Check the wiring between PU1 and
YES
UN1.
NO Change PU1.
Check the wiring between PU1 and
YES
PWB-B.
NO Change PU1.
Check the wiring between PWB-C and
YES
UN1.
NO Change PWB-C.
YES Change PWB-B or UN1.
Correct the wiring or change the har-
NO
ness.
T-106
1156C21TAA
Action