Olivetti d-color MF651, Service Manual, Page: 955 / 1053

Field Service Ver. 2.0 Jul. 2009 22. IMAGE QUALITY PROBLEM
895
TROUBLESHOOTING
22.3.31 Printer 4-color: low image density
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C516DA
ABCDE
ABCDE
ABCDE
ABCDE
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 Charge neutralizing needle is not
separated and ground terminal is
connected properly. NO Correct or change.
5 IDC sensor Sensor is dirty. YES Clean IDC sensor and execute
the image stabilization.
6 Image Process
Adjustment
o
Gradation
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
Stabilizer
o
Reset + Stabi-
lizer
(Service Mode)
After the Init 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/2.
Y110571-1 Service Manual