C2551: Abnormally Low Toner Density Detected Cyan Tcr Sensor - Konica Minolta bizhub C450 Service Manual

16. Malfunction code
16.6.24

C2551: Abnormally low toner density detected Cyan TCR Sensor

16.6.25 C2553: Abnormally low toner density detected Magenta TCR Sensor
16.6.26 C2555: Abnormally low toner density detected Yellow TCR Sensor
TCR Sensor/C (PWB-N3)
TCR Sensor/M (PWB-N2)
TCR Sensor/Y (PWB-N1)
Toner Supply Motor C/K (M3)
Toner Supply Motor Y/M (M4)
Step
Perform image troubleshooting procedure if
1
image density is low.
Clean the TCR Sensor window on the under-
2
side of the Imaging Unit if dirty
Correct the TCR Sensor spring moving part if
3
faulty.
4 Clean the TCR Sensor LED if dirty
5 Change TCR Sensor C/M/Y.
M3, M4 operation check
6
7 Change Imaging Unit.
8 Change PWB-MC
9 Change PWB-MFPC.
352
Relevant Electrical Parts
Control Board (PWB-MC)
MFP Control Board (PWB-MFPC)
Imaging Unit /C
Imaging Unit /M
Imaging Unit /Y
Action
Field Service Ver. 1.0 Mar. 2005
WIRING DIAGRAM
Control Signal
—
—
—
—
—
PWB-MC PJ8MC-1 to 4
PWB-MC PJ8MC-5 to 8
—
—
—
Location
(Electrical
Component)
—
—
—
—
—
C∼D-14
—
—
—