Print Quality-Background - Olivetti d-Color MF920 Service Manual

Print quality—background
Service tip: Some background problems can be caused by rough papers, non-Olivetti
toner cartridges or if the media texture is set to the rough setting.
Some slick or coated papers may also cause background problems. Some problems
occur with printers that run a large amount of graphics in a humid environment.
Step Questions / actions
1 Read the current status of the imaging unit
from the customer menus.
To view the status of the photoconductor units:
1. In Ready mode, press Menus (
2. Select Reports, and press Select (
3. Select Device Statistics, and press
Select (
It is possible a new imaging unit was installed,
but the counter was not reset.
Has the imaging unit been recently replaced?
2 Is the background only one of the primary
colors; yellow, cyan, magenta, or black?
3 Did replacing the developer unit correct the
problem?
4
Replace the photoconductor unit.
Does this fix the problem?
5 Check the high-voltage contact from the HVPS
to the image transfer unit (ITU).
Is a problem found?
6 Reseat the cable in the JHVPS1 connector.
Does this fix the problem?
7 Replace the HVPS. See
supply (HVPS) assembly removal" on
page 4-31.
Does this fix the problem?
Y112730-2
).
).
"High-voltage power
Yes
Reset the value. To reset
this value:
1. In Ready mode, press
Menus ( ).
2. Select Supplies Menu,
).
and press Select (
3. Select Replace Supply,
and press Select (
4. Select the imaging unit
you want to change, and
press Select (
5. Select Yes, and press
Select ( ).
If this does not fix the
problem, go to step 2.
Replace the developer unit
for the background color
and retest. See "Developer
unit removal" on
page 4-42.
Go to step 3.
Problem resolved.
Problem resolved.
Replace the failing part:
• Image transfer unit
(ITU). See "Image
transfer unit (ITU)" on
page 4-35.
• High-voltage power
supply (HVPS). See
"High-voltage power
supply (HVPS)
assembly removal" on
page 4-31.
Problem resolved.
Problem resolved.
No
Go to step 2.
).
).
).
Go to step 4.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Diagnostic information
2-49