17. Power Supply Trouble; Machine Is Not Energized At All (Dcpu Operation Check); 17.2 Control Panel Indicators Do Not Light - Konica Minolta bizhub C353 Service Manual

17. Power supply trouble

17. Power supply trouble

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

Main power switch (S1)
Front door switch/1 (S3)
Front door switch/2 (S4)
Printer control board (PRCB)
Step
Is a power voltage supplied across CN1-1
1
2
and 2 on DCPU?
2 Are the fuses on DCPU conducting?
Is DC24 V being output from CN7-5 on
3
2
DCPU?
4 Is DC5 V being input to CN5-1 on DCPU?
2
Is DC5 V being input to CN31-3 on the
5 printer control board?
(LED on PRCB does not blink.)

17.2 Control panel indicators do not light.

Image processing board (IPB)
Scanner relay board (REYB/SCAN)
Control panel
Step
Is the I/F cable between the scanner and
1
engine connected properly?
After the main or sub main power switch is
turned ON, the blue and orange status indi-
2 cator lights continue to be on while the con-
trol panel is not being displayed.
Is JMPB (PJ17) securely set on the MFPB?
Is a power voltage being applied across
3
2
CN1-1 and 2 on DCPU?
4 Is the fuse on DCPU conducting?
Is DC24 V being output from CN9-10 on
5
2
DCPU and DC5 V from CN11-1?
6 Is CN1 on IPB securely connected?
2
Is CN6 on REYB/SCAN securely con-
7
nected?
550
2
Relevant parts
Check item
Relevant parts
Check item
Field Service Ver. 4.0 Jun. 2008
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Check the WIRING from
R to S-2 NO the wall outlet to S1 to
CN1.
— NO Change DCPU.
P-7 NO Change DCPU.
P-6 NO Change DCPU.
NO Change DCPU.
H to I-4
YES Change PRCB.
JMP board (JMPB)
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Reconnect or change the
— NO
I/F cable.
U to V-19 NO Reconnect.
Check the WIRING from
R to S-2 NO the wall outlet to S1 to
CN1.
— NO Change DCPU.
Q-3 NO Change DCPU.
T-9 to 10 NO Reconnect.
U to V-10 NO Reconnect.
Action
Action