15. Power Supply Troubles; Machine Is Not Energized At All (Dcpu Operation Check); 15.2 Control Panel Indicators Do Not Light - Konica Minolta Bizhub-C31P Service Manual

Field Service Ver. 1.0 Apr. 2008

15. Power supply troubles

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

Power switch (S1)
Print control board (PRCB)
Step
Is the power source voltage being applied
1
to CN1 on DCPU?
Are fuses (F1 and F2) on DCPU conduct-
2
ing?
Are DC 24 V, DC 5 V and DC 3.3 V being
3
applied to PJ1 on the print control board?

15.2 Control panel indicators do not light

MFP board (MFPB)
Operation board (OB)
Step
Is the power source voltage being applied
1
to CN1 on DCPU?
Are fuses (F1 and F2) on DCPU conduct-
2
ing?
3 Is J22 on MFPB properly connected?
4 Is J7000 on MFPB properly connected?
5 Is CN2 on OB properly connected?
Relevant electrical parts
Check item
Relevant electrical parts
Check item
15. Power supply troubles
DC power supply (DCPU)
Location (electri-
Result
cal component)
H to I-4 NO
⎯
NO
NO
F-3
YES Change DCPU.
DC power supply (DCPU)
Location (electri-
Result
cal component)
H to I-4 NO
⎯
NO
I-10 NO
I-11 NO
NO
K-10 to 11
YES
Action
Check wiring from
power outlet to PG1 to
CN1DCPU.
Change DCPU.
Change PRCB.
Change MFPB.
Action
Check wiring from
power outlet to PG1 to
CN1DCPU.
Change DCPU.
Reconnect.
Reconnect.
Reconnect.
Change OB.
Change MFPB.
219