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 C650 Service Manual

Field Service Ver. 8.0 Jun. 2008
16.5.33

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
16.5.34

C2551: Abnormally low toner density detected cyan TCR sensor

16.5.35

C2553: Abnormally low toner density detected magenta TCR sensor

16.5.36

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
Toner empty sensor/C (PZS/C)
Toner empty sensor/M (PZS/M)
Toner empty sensor/Y (PZS/Y)
Step
Perform image troubleshooting procedure if
1
image density is low.
Clean the TCR sensor window on the
2
underside of the imaging unit if dirty
3 Reinstall imaging unit
4 Reinstall toner cartridge
M9, M10, M11 operation check
5
(At this time, IU must be non-installation.)
6 M13, M14 operation check
If the toner empty sensor and its surround-
7 ings inside the sub hopper are dirtied with
toner, clean them.
8 Change imaging unit
9 Change PRCB.
Relevant parts
Action
Relevant parts
Action
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
—
Toner supply motor/Y (M9)
Toner supply motor/M (M10)
Toner supply motor/C (M11)
Toner cartridge motor Y/M (M13)
Toner cartridge motor C/K (M14)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
—
—
M9: PRCB CN16PRCB-1 to 4
M10: PRCB CN16PRCB-5 to 8
M11: PRCB CN16PRCB-9 to 12
M13: PRCB CN17PRCB-5 to 8
M14: PRCB CN17PRCB-9 to 12
—
—
—
16. Malfunction code
Location (Electri-
cal component)
—
—
—
Location (Electri-
cal component)
—
—
—
—
C-22 to 23
K-1
—
—
—
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