Power Supply Trouble; Control Panel Indicators Do Not Light - Konica Minolta bizhub C200 Service Manual

Field Service Ver. 1.0 Jun. 2008

18. Power supply trouble

18.1 Machine is not energized at all (DCPU operation check)
Main power switch (SW1)
Front door switch/1 (MS3)
Front door switch/2 (MS4)
Printer control board (PRCB)
Step
Is a power voltage supplied across
1
CN1_INP-1 and 2 on DCPU?
2 Are the fuses on DCPU conducting?
Is DC24 V being output from CN_SIG-1 on
3
DCPU?
Is DC5 V being input to CN_MCB-5 and 7
4
on DCPU?
Is DC5 V being input to CN26-4 on PRCB?
5
(LED on PRCB does not blink.)

18.2 Control panel indicators do not light.

BCRU board (BCRUB)
OPEU board (OPEUB)
LCD board (LCDB)
LCD_INV board (LCDINVB)
Step
Is the I/F cable between the scanner and
1
engine connected properly?
Is a power voltage being applied across
2
CN_SCN1-8 on DCPU?
3 Is the fuse on DCPU conducting?
Is CN12 on MFBUB to CN2 on BCRUB
4
securely connected?
Is CN3 on BCRUB to CN1 on OPEUB
5
securely connected?
Relevant parts
Check item
Relevant parts
Check item
18. Power supply trouble
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Check the wiring from the
T-3 NO wall outlet to SW1 to
CN1_INP.
— NO Change DCPU.
R-3 to 4 NO Change DCPU.
R-4 to 5 NO Change DCPU.
NO Change DCPU.
H to I-3 to 4
YES Change PRCB.
MFBU board (MFBUB)
DC power supply (DCPU)
WIRING
DIAGRAM Result
(Location)
Reconnect or change the
— NO
I/F cable.
Check the wiring from the
R-3 NO wall outlet to SW1 to
CN_SCN1.
— NO Change DCPU.
V-6
NO Reconnect.
W-19
W-17 to 18
NO Reconnect.
U to V-17 to 18
Action
Action
315