Printer 4-Color: Low Image Density - Konica Minolta bizhub C25 Service Manual

22. IMAGE QUALITY PROBLEM
22.2.28

Printer 4-color: low image density

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Paper
2 Transfer belt unit Terminal is dirty.
3 Transfer roller
unit
4
5 IDC sensor
6
372
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
Check item
Paper is damp.
Transfer roller is installed properly.
Charge neutralizing needle is not
separated and ground terminal is
connected properly.
Sensor is dirty.
The problem has been eliminated
through the checks of steps up to 5.
Field Service Ver. 1.1 May 2011
Result Action
YES Change paper to one just
unwrapped from its package.
YES Clean.
NO Reinstall.
NO Correct or change.
YES Clean IDC sensor and execute
the calibration.
NO Change transfer belt unit.
 Change IDC sensor.
 Change printer control board.
 Change high voltage unit.
A02EF4C516DA