Printer 4-Color: Low Image Density - Konica Minolta Magicolor 8650 Service Manual

16. Image quality problem
16.3.17

Printer 4-color: low image density

A. Typical faulty images
B. Troubleshooting procedure
Step Section
Paper
1
2 Transfer belt unit Terminal is dirty.
3 Transfer roller
unit
4
IDC sensor
5
Service Mode →
ProcessAdjust-
6
ment → Dmax
Density
Service Mode →
ProcessAdjust-
ment → Stabili-
7
zation →
Initialize + Stabi.
8
364
Confidential – for internal use only, do not distribute
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
Check item
Paper is damp.
Transfer roller is installed properly.
Transfer roller is dirty or scratched.
Sensor is dirty.
The problem has been eliminated
through the adjust of Dmax
Density.
After the Initialize + Stabi.
sequence has been completed, run
gradation adjust.
The problem has been eliminated
through the checks of steps up to 7.
Field Service Ver. 2.0 Nov. 2007
Result Action
YES Change paper to one just
unwrapped from its package.
YES Clean.
NO Reinstall.
NO Change transfer roller unit.
YES Clean IDC sensor and execute
the stabilization.
NO Go to next step.
NO Go to next step.
NO Change image transfer belt unit.
→ Change printer control board.
→ Change high voltage unit.
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