Field Service Ver. 1.0 Jun. 2008 18. Power supply trouble
315
Troubleshooting
18. Power supply trouble
18.1 Machine is not energized at all (DCPU operation check)
18.2 Control panel indicators do not light.
Relevant parts
Main power switch (SW1)
Front door switch/1 (MS3)
Front door switch/2 (MS4)
Printer control board (PRCB)
DC power supply (DCPU)
Step Check item
WIRING
DIAGRAM
(Location)
Result Action
1
Is a power voltage supplied across
CN1_INP-1 and 2 on DCPU?
T- 3 N O
Check the wiring from the
wall outlet to SW1 to
CN1_INP.
2 Are the fuses on DCPU conducting? — NO Change DCPU.
3
Is DC24 V being output from CN_SIG-1 on
DCPU?
R-3 to 4 NO Change DCPU.
4
Is DC5 V being input to CN_MCB-5 and 7
on DCPU?
R-4 to 5 NO Change DCPU.
5
Is DC5 V being input to CN26-4 on PRCB?
(LED on PRCB does not blink.)
H to I-3 to 4
NO Change DCPU.
YES Change PRCB.
Relevant parts
BCRU board (BCRUB)
OPEU board (OPEUB)
LCD board (LCDB)
LCD_INV board (LCDINVB)
MFBU board (MFBUB)
DC power supply (DCPU)
Step Check item
WIRING
DIAGRAM
(Location)
Result Action
1
Is the I/F cable between the scanner and
engine connected properly?
—NO
Reconnect or change the
I/F cable.
2
Is a power voltage being applied across
CN_SCN1-8 on DCPU?
R-3 NO
Check the wiring from the
wall outlet to SW1 to
CN_SCN1.
3 Is the fuse on DCPU conducting? — NO Change DCPU.
4
Is CN12 on MFBUB to CN2 on BCRUB
securely connected?
V-6
W-19
NO Reconnect.
5
Is CN3 on BCRUB to CN1 on OPEUB
securely connected?
W-17 to 18
U to V-17 to 18
NO Reconnect.
d-Color MF201
Y109660-1 Sevice Manual
d-Color MF201
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