Power Supply Trouble; Machine Is Not Energized At All (Dcpu Operation Check); Control Panel Indicators Do Not Light - Konica Minolta bizhub C35P Service Manual

Field Service Ver. 1.0 May 2010

14. POWER SUPPLY TROUBLE

14.1 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 DC3.3V being output from
CN24, CN25 on MFPB?
3 Is DC3.3 V being output from PJ1 on
PRCB?
4 Check the wiring from the CN16MFPB to
PJ5PRCB.
5 Check the wiring from the PJ1PRCB to
CN4DCPU.

14.2 Control panel indicators do not light

MFP board (MFPB)
Control panel
Step
1 Is a power voltage supplied across CN1 on
DCPU?
2 Are the fuses on DCPU conducting?
3 Is CN17 on MFPB properly connected?
Relevant parts
Check item
Relevant electrical parts
Check item
14. POWER SUPPLY TROUBLE
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
J-11 NO Check the wiring from the
wall outlet to inlet to SW1
to CN1DCPU.
CN24: G-11 NO Check the wiring from the
CN25: H-11 CN4, CN5DCPU to CN24,
CN25MFPB.
G-13 NO Check the wiring from the
CN4DCPU to PJ1PRCB.
- YES Reconnect.
Change flat cable.
- YES Reconnect.
NO Change PRCB.
DC power supply (DCPU)
Location (electri-
Result
cal component)
G-10
NO
- NO
C-2 NO
YES
Action
Action
Check the wiring from
the wall outlet to inlet to
SW1 to CN1DCPU.
Change DCPU.
Reconnect.
Change MFPB.
Change operation
panel.
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