Power Supply Trouble; Machine Is Not Energized At All (Pu1 Operation Check); Control Panel Indicators Do Not Light - Konica Minolta bizhub C250P Service Manual

24. Power supply trouble

24. Power supply trouble

24.1 Machine is not Energized at All (PU1 Operation Check)

Main Power Switch (S1)
Mechanical Control Board (PWB-M)
Step
Is a power voltage supplied across PJ1PU1-1 and 3 on
1 PU1?
2 Are the fuses on PU1 conducting?
3 Is DC24 V being output from PJ5PU1-2 on PU1?
4 Is DC5 V being input to PJ7PU1-3 on PU1?
Is DC5 V being input to CNPOW-4 on the Control Board?
5
(LED on PWB-M does not blink.)

24.2 Control panel indicators do not light.

Control Panel (UN1)
Step
Is a power voltage being applied across PJ1PU1-1 and 3
1 on PU1?
2 Is the fuse on PU1 conducting?
Is DC5 V being output from PJ13PU1-1 on PU1 and DC24
3
V from PJ12PU1-2?
Is CN1 on UN1 securely connected?
4
340
Relevant Electrical Parts
DC Power Supply (PU1)
Check Item
Relevant Electrical Parts
DC Power Supply (PU1)
Check Item
Field Service Ver. 2.0 Mar. 2006
Result Action
Check the WIRING from
NO the wall outlet to S1
PJ1PU1.
NO Change PU1.
NO Change PU1.
NO Change PU1.
NO Change PU1.
YES Change PWB-M
Result Action
Check the WIRING from
NO the wall outlet to S1
PJ1PU1.
NO Change PU1.
NO Change PU1.
NO Reconnect.
YES Change UN1.