Olivetti d-Color MF920, Service Manual

Page: 93 / 332

Diagnostic information
2-49
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 Yes No
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?
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.
Go to step 2.
2 Is the background only one of the primary
colors; yellow, cyan, magenta, or black? Replace the developer unit
for the background color
and retest. See
“Developer
unit removal” on
page 4-42
.
Go to step 3.
Go to step 4.
3
Did replacing the developer unit correct the
problem? Problem resolved. Go to step 4.
4
Replace the photoconductor unit.
Does this fix the problem?
Problem resolved. Go to step 5.
5 Check the high-voltage contact from the HVPS
to the image transfer unit (ITU).
Is a problem found?
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
.
Go to step 6.
6 Reseat the cable in the JHVPS1 connector.
Does this fix the problem?
Problem resolved. Go to step 7.
7
Replace the HVPS. See “High-voltage power
supply (HVPS) assembly removal” on
page 4-31
.
Does this fix the problem?
Problem resolved. Go to step 8.
Y112730-2