Field Service Ver. 1.0 Jun. 2008
17. Malfunction code
301
T
roubleshooting
17.5.8
C2451: Release new transfer belt unit
17.5.9
C2551: Abnormally low toner density detected cyan TCR sensor
17.5.10
C2553: Abnormally low toner density detected magenta TCR sensor
17.5.11
C2555: Abnormally low toner density detected yellow TCR sensor
Relevant parts
Transfer belt unit
Printer control board (PRCB)
Step
Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1
Reinstall unit
—
—
2
Check there is a short circuit in the fuse of
the transfer belt unit.
—
—
3
Check the PRCB connector for proper
connection and correct as necessary.
—
—
4
Change PRCB
—
—
Relevant parts
Imaging unit /C
Imaging unit /M
Imaging unit /Y
Toner cartridge /C
Toner cartridge /M
Toner cartridge /Y
Toner supply motor/CK (M7)
Toner supply motor/YM (M6)
Printer control board (PRCB)
Step
Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1
Reinstall imaging unit
—
—
2
Reinstall toner cartridge
—
—
3
M6 operation check
(At this time, IU must be non-installation.)
PRCB CN30-5 to 8
C to D-24
4
M7 operation check
(At this time, IU must be non-installation.)
PRCB CN30-1 to 4
C to D-24
5
Change imaging unit
—
—
6
Change PRCB.
—
—
d
-Color
M
F
201
Y109660-1 Sevice Manual