19. Image quality problem Field Service Ver. 1.0 Jun. 2008
354
Troubleshooting
19.3.31 Printer 4-color: low image density
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C516DA
ABCDE
ABCDE
ABCDE
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ABCDE
Step Section Check item Result Action
1
Paper Paper is damp. YES Change paper to one just
unwrapped from its package.
2 Transfer belt unit Terminal is dirty. YES Clean.
3 Transfer roller
unit
Transfer roller is installed properly. NO Reinstall.
4 Transfer roller is dirty or scratched. NO Change transfer roller unit.
5
IDC sensor Sensor is dirty. YES Clean IDC sensor and execute
the image stabilization.
6
Image Process
Adjustment
oGradation
Adjust
(Service Mode)
“Conv. Value” falls within the
specified range as checked through
gradation adjust.
Dark: 0 ± 100
Highlight: 0 ± 60
YES Go to step 9.
7
Image Process
Adjustment
o D Max Density
(Service Mode)
The problem has been eliminated
through the adjust of D Max
Density.
NO Go to next step.
8
Image Process
Adjustment o
Image Stabiliza-
tion o Initialize +
Image Stabiliza-
tion
(Service Mode)
After the Initialize + Image Stabili-
zation sequence has been com-
pleted, run gradation adjust.
NO Go to next step.
9
The problem has been eliminated
through the checks of steps up to 8.
NO Change image transfer belt unit.
o Change printer control board
o Change high voltage unit.
d-Color MF201
Service Manual Y109660-1
d-Color MF201
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