C2552: Abnormally High Toner Density Detected Cyan Tcr Sensor; C2554: Abnormally High Toner Density Detected Magenta Tcr Sensor; C2556: Abnormally High Toner Density Detected Yellow Tcr Sensor; C2557: Abnormally Low Toner Density Detected Black Tcr Sensor - Konica Minolta bizhub C650 Service Manual

16. Malfunction code
16.5.37

C2552: Abnormally high toner density detected cyan TCR sensor

16.5.38

C2554: Abnormally high toner density detected magenta TCR sensor

16.5.39

C2556: Abnormally high 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
Clean the TCR sensor window on the
1
underside of the imaging unit if dirty
2 Reinstall imaging unit
3 Reinstall toner cartridge
4 Change imaging unit
5 Change PRCB
6 Change sub hopper unit
16.5.40

C2557: Abnormally low toner density detected black TCR sensor

Imaging unit /K
Toner cartridge /K
Toner empty sensor/K (PZS/K)
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
M12 operation check
3
(At this time, IU must be non-installation.)
4 M14 operation check
5 Reinstall imaging unit
6 Reinstall toner cartridge
If the toner empty sensor and its surround-
7 ings inside the sub hopper are dirtied with
toner, clean them.
8 Change imaging unit /K
9 Change PRCB.
650
Relevant parts
Action
Relevant parts
Action
Field Service Ver. 8.0 Jun. 2008
Sub hopper unit
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
—
—
—
—
Toner supply motor/K (M12)
Toner cartridge motor C/K (M14)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
—
PRCB CN16PRCB-13 to 16
PRCB CN17PRCB-9 to 12
—
—
—
—
—
Location (Electri-
cal component)
—
—
—
—
—
—
Location (Electri-
cal component)
—
—
C-22
K-1
—
—
—
—
—