17. Power Supply Trouble; Machine Is Not Energized At All (Pu1 Operation Check); 17.2 Control Panel Indicators Do Not Light - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 1.0 Jul. 2005

17. Power supply trouble

17.1 Machine is not Energized at All (PU1 Operation Check)

Main Power Switch (S1)
Mechanical Control Board (PWB-M)
Step
Is a power voltage supplied across PJ1PU1-1
1 and 3 on PU1?
2 Are the fuses (F1 and F2) on PU1 conducting?
Is DC24 V being output from PJ5PU1-2 on
3
PU1?
4 Is DC5 V being input to PJ7PU1-3 on PU1?
Is DC5 V being input to CNPOW-4 on the Con-
5
trol Board? (LED on PWB-M does not blink.)

17.2 Control panel indicators do not light.

Image Processing Board (PWB-C)
Control Panel (UN201)
Step
Is the I/F cable between the Scanner and
1
engine connected properly?
Is a power voltage being applied across
2 PJ1PU1-1 and 3 on PU1?
3 Is the fuse on PU1 conducting?
Is DC5 V being output from PJ13PU1-1 on
4
PU1 and DC24 V from PJ12PU1-2?
5 Is PJ12C on PWB-C securely connected?
Is CN1UN201 on UN201 securely connected?
6
Relevant Electrical Parts
Check Item
Relevant Electrical Parts
Check Item
17. Power supply trouble
DC Power Supply (PU1)
WIRING
DIAGRAM Result
(Location)
Q to R-2 NO
— NO
P-7 NO
P-7 NO
NO
I-7
YES
DC Power Supply (PU1)
WIRING
DIAGRAM Result
(Location)
— NO
Q to R-2 NO
— NO
R-7
NO
R-8
X-10 to 11 NO
NO
X-21
YES
Action
Check the WIRING from
the wall outlet to S1
PJ1PU1.
Change PU1.
Change PU1.
Change PU1.
Change PU1.
Change PWB-M
Action
Reconnect or change
the I/F cable.
Check the WIRING from
the wall outlet to S1
PJ1PU1.
Change PU1.
Change PU1.
Reconnect.
Reconnect.
Change UN201.
Change PWB-C.
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