Printer 4-Color: Low Image Density - Konica Minolta bizhub C200 Service Manual

19. Image quality problem
19.3.31

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
Image Process
Adjustment
→Gradation
6
Adjust
(Service Mode)
Image Process
Adjustment
7
→ D Max Density
(Service Mode)
Image Process
Adjustment →
Image Stabiliza-
tion → Initialize +
8
Image Stabiliza-
tion
(Service Mode)
9
408
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
Check item
Paper is damp.
Transfer roller is installed properly.
Transfer roller is dirty or scratched.
Sensor is dirty.
"Conv. Value" falls within the
specified range as checked through
gradation adjust.
Dark: 0 ± 100
Highlight: 0 ± 60
The problem has been eliminated
through the adjust of D Max
Density.
After the Initialize + Image Stabili-
zation sequence has been com-
pleted, run gradation adjust.
The problem has been eliminated
through the checks of steps up to 8.
Field Service Ver. 2.0 Dec. 2008
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 image stabilization.
YES Go to step 9.
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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