Konica Minolta Bizhub-C31P, Service Manual, Page: 256 / 370

Field Service Ver. 1.0 Apr. 2008 15. Power supply troubles
219
bizhub C31P
T
roubleshooting
15. Power supply troubles
15.1 Machine is not energized at all (DCPU operation check)
15.2 Control panel indicators do not light
Relevant electrical parts
Power switch (S1)
Print control board (PRCB) DC power supply (DCPU)
Step Check item
Location (electri-
cal component)
Result Action
1
Is the power source voltage being applied
to CN1 on DCPU?
H to I-4 NO
Check wiring from
power outlet to PG1 to
CN1DCPU.
2
Are fuses (F1 and F2) on DCPU conduct-
ing?
⎯
NO Change DCPU.
3
Are DC 24 V, DC 5 V and DC 3.3 V being
applied to PJ1 on the print control board?
F-3
NO
Change PRCB.
Change MFPB.
YES Change DCPU.
Relevant electrical parts
MFP board (MFPB)
Operation board (OB) DC power supply (DCPU)
Step Check item
Location (electri-
cal component)
Result Action
1
Is the power source voltage being applied
to CN1 on DCPU?
H to I-4 NO
Check wiring from
power outlet to PG1 to
CN1DCPU.
2
Are fuses (F1 and F2) on DCPU conduct-
ing?
⎯
NO Change DCPU.
3 Is J22 on MFPB properly connected? I-10 NO Reconnect.
4 Is J7000 on MFPB properly connected? I-11 NO Reconnect.
5 Is CN2 on OB properly connected? K-10 to 11
NO Reconnect.
YES
Change OB.
Change MFPB.