Power Supply Troubles; Machine Is Not Energized At All (Dcpu Operation Check); Control Panel Indicators Do Not Light - Konica Minolta bizhub c20 Service Manual

Field Service Ver. 1.0 Sep. 2008

19. Power supply troubles

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

Main power switch (SW1)
Print control board (PRCB)
Step
Is the power source voltage being applied
1
to CN_INP 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?

19.2 Control panel indicators do not light

MFP board/1 (MFPB/1)
Operation board (OB)
Step
Is the power source voltage being applied
1
to CN_INP on DCPU?
Are fuses (F1 and F2) on DCPU conduct-
2
ing?
3 Is P115 on MFPB/1 properly connected?
4 Is CN701 on OB properly connected?
Relevant electrical parts
Check item
Relevant electrical parts
Check item
19. Power supply troubles
DC power supply (DCPU)
Location (electri-
Result
cal component)
J-1 NO
⎯
NO
NO
I-1
YES Change DCPU.
DC power supply (DCPU)
Location (electri-
Result
cal component)
J-1 NO
⎯
NO
L to M-11 to 12 NO
NO
N to O-11 to 12
YES Change OB.
Action
Check wiring from
power outlet to PG1 to
CN1DCPU.
Change DCPU.
Change PRCB.
Action
Check wiring from
power outlet to PG1 to
CN1DCPU.
Change DCPU.
Reconnect.
Reconnect.
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