Power Supply Trouble; Machine Is Not Energized At All (Dcpu Operation Check); Control Panel Indicators Do Not Light - Konica Minolta bizhub C25 Service Manual

19. POWER SUPPLY TROUBLE

19. POWER SUPPLY TROUBLE

19.1 Machine is not energized at all (DCPU operation check)

Power switch (SW1)
Printer control board (PRCB)
Step
1 Is a power voltage supplied across CN1 on
DCPU?
2 Are DC5 V and DC3.4V being output from
P102 ON MFPB/1?
3 Is DC3.3 V being output from PJ1 on
PRCB?
4 Is DC24 V being output from P101 on
MFPB/1?
5 Check the wiring from the Pj108MFPB/1 to
PJ52PRCB.
6 Check the wiring from the PJ1PRCB to
CN4DCPU.

19.2 Control panel indicators do not light

MFP board/1 (MFPB/1)
Control panel
Step
1 Is a power voltage supplied across CN1 on
DCPU?
2 Are the fuses on DCPU conducting?
3 Is P104 on MFPB/1 properly connected?
302
Relevant parts
Check item
Relevant electrical parts
Check item
Field Service Ver. 1.1 May 2011
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
E-6 NO Check the wiring from the
wall outlet to inlet to SW1
to CN1DCPU.
E-2 NO Check the wiring from the
CN5, CN9DCPU to
P102MFPB/1.
D-5 NO Check the wiring from the
CN4DCPU to PJ1PRCB.
E-2 YES Change MFPB/1.
- YES Reconnect.
Change flat cable.
- YES Reconnect.
NO Change PRCB.
DC power supply (DCPU)
Location (electri-
Result
cal component)
E-6
NO
- NO
F-2 NO
YES
Action
Action
Check the wiring from
the wall outlet to inlet to
SW1 to CN1DCPU.
Change DCPU.
Reconnect.
Change MFPB/1.
Change scanner unit.
Change operation
panel.