Power Supply Trouble - Konica Minolta bizhub C650 Service Manual

17. Power supply trouble

17. Power supply trouble
17.1 Machine is not energized at all (DCPU operation check)
Main switch (SW1)
Printer control board (MFPB)
Step
Check that the fusing unit is securely
2
1
plugged in. (Only for bizhub C650)
Is a power voltage supplied across
2
PJ1DCPU-1 and 2 on DCPU?
3 Are the fuses on DCPU conducting?
Is DC24 V being output from PJ10DCPU-3,
4
4 on DCPU?
Is DC5 V being input to PJ11DCPU-5 to 7
5
on DCPU?
Is DC5 V being input to CN3PRCB-3 on the
6 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
PJ1DCPU-1 and 2 on DCPU?
4 Is the fuse on DCPU conducting?
Is DC24 V being output from PJ13DCPU-1
5
on DCPU and DC5 V from PJ12DCPU-4?
6 Is CN1IPB on IPB securely connected?
Is CN6REYB/SCAN on REYB/SCAN
7
securely connected?
684
2
Relevant parts
Check item
Relevant parts
Check item
Field Service Ver. 8.0 Jun. 2008
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
— NO Reconnect.
Check the WIRING from
K-20 NO
the wall outlet to SW1 PJ1.
— NO Change DCPU.
I to J-22 NO Change DCPU.
I to J-22 to 23 NO Change DCPU.
NO Change DCPU.
G to H-22
YES Change PRCB.
JMP board (JMPB)
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Reconnect or change the
— NO
I/F cable.
R to S-26 NO Reconnect.
Check the WIRING from
K-20 NO
the wall outlet to SW1 PJ1.
— NO Change DCPU.
J to K-
NO Change DCPU.
21 to 22
S-16 NO Reconnect.
T-17 NO Reconnect.
Action
Action