C2451: Release New Transfer Belt Unit; C2551: Abnormally Low Toner Density Detected Cyan Tcr Sensor; C2553: Abnormally Low Toner Density Detected Magenta Tcr Sensor; C2555: Abnormally Low Toner Density Detected Yellow Tcr Sensor - Konica Minolta bizhub C353P Service Manual

20. Malfunction code
20.5.12

C2451: Release new transfer belt unit

Transfer belt unit
Step
1 Reinstall unit
Check there is a short circuit in the fuse of
2
the transfer belt unit.
Check the PRCB connector for proper
3
connection and correct as necessary.
4 Change PRCB
20.5.13

C2551: Abnormally low toner density detected cyan TCR sensor

20.5.14

C2553: Abnormally low toner density detected magenta TCR sensor

20.5.15

C2555: Abnormally low toner density detected yellow TCR sensor

Imaging unit /C
Imaging unit /M
Imaging unit /Y
Toner cartridge /C
Toner cartridge /M
Toner cartridge /Y
Step
1 Reinstall imaging unit
2 Reinstall toner cartridge
M3, M4 operation check
3
(At this time, IU must be non-installation.)
4 Change imaging unit
5 Change PRCB
436
Relevant parts
Action
Relevant parts
Action
Field Service Ver. 1.0 Oct. 2007
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
—
—
Toner supply motor/CK (M3)
Toner supply motor/YM (M4)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
PRCB CN39PRCB-1 to 4 (M3)
PRCB CN39PRCB-5 to 8 (M4)
—
—
Location (Electri-
cal component)
—
—
—
—
Location (Electri-
cal component)
—
—
D-23
—
—