DRAFT
Field Service Ver. 1.0 Feb. 2010
15. POWER SUPPLY TROUBLE
15.1 Machine is not energized at all (DCPU operation check)
Power switch (SW1)
Printer control board (PRCB)
Step
1
Is a power voltage supplied across CN1 on
DCPU?
2
Are DC5 V and DC3.3V being output from
CN11 ON MFPB?
3
Is DC3.3 V being output from PJ1 on
PRCB?
4
Is DC24 V being output from CN105 on
MFPB?
5
Check the wiring from the CN16MFPB to
PJ21PRCB.
6
Check the wiring from the PJ1PRCB to
CN4DCPU.
15.2 Control panel indicators do not light
MFP board (MFPB)
Control panel
Step
1
Is a power voltage supplied across CN1 on
DCPU?
2
Are the fuses on DCPU conducting?
3
Is CN13 on MFPB properly connected?
4
Is CN11 on MFPB properly connected?
Relevant parts
Check item
Relevant electrical parts
Check item
15. POWER SUPPLY TROUBLE
DC power supply (DCPU)
WIRING
DIAGRAM
Result
(Location)
G-10
NO
Check the wiring from the
wall outlet to inlet to SW1
to CN1DCPU.
C-2
NO
Check the wiring from the
CN5, CN9DCPU to
CN11MFPB.
F-13
NO
Check the wiring from the
CN4DCPU to PJ1PRCB.
C-2
YES
Change MFPB.
-
YES
Reconnect.
Change flat cable.
-
YES
Reconnect.
NO
Change PRCB.
DC power supply (DCPU)
Location (electri-
Result
cal component)
G-10
NO
-
NO
C-2
NO
C-2
NO
YES
Action
Action
Check the wiring from
the wall outlet to inlet to
SW1 to CN1DCPU.
Change DCPU.
Reconnect.
Reconnect.
Change MFPB.
Change scanner unit.
Change operation
panel.
221