Olivetti d-Color MF920, Service Manual

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2-52
Service Manual
Print quality—blurred or fuzzy print
Run the automatic alignment. The TPS sensor may be damaged. To run Reset Color
Cal:
1.
Enter the Diagnostics Menu. (Turn the printer off, press and hold and , turn
the printer on, and release the buttons when installed memory and processor
speed displays.
2.
Select TPS Setup from Diag Menu, and press Select ( ).
3.
Select Reset Color Cal , and press Select ( ).
Resetting
appears. When the reset is complete, the screen is automatically
returned to TPS Setup.
Blurred or fuzzy print is usually caused by a problem in the main drive gear assembly or in the image transfer
unit (ITU). Check the main drive gear assembly and ITU for correct operation.
Blurred print can also be caused by incorrect feeding from one of the input paper sources, media trays, or
duplex paper path.
Check the high-voltage spring contacts to ensure they are not bent, corroded, or damaged. Replace the high-
voltage power supply as necessary. See
“High-voltage power supply (HVPS) assembly removal” on
page 4-31 .
Print quality—half-color page
A photoconductor unit is not properly seated. Reset the specific photoconductor unit.
Print quality—horizontal banding
Print the Print Defect Page:
1.
At the Ready prompt, press Menu ( ).
2.
Select Reports , and press Select ( ).
3.
Select Print Defects, and press Select ( ).
Step Questions / actions Yes No
1 Measure the distance between repeating
bands.
Is the distance between bands either 34.6 or
94.2 mm?
Replace the photoconductor
unit. Remove the imaging
unit and remove the original
developer units, and then
put them back into the new
photoconductor unit, and
reinstall the imaging unit.
See
“Imaging unit (IU)
removal” on page 4-40 .
Go to step 2.
2 Does the distance measure 95 mm or
108 mm? Replace the fuser. See
“Fuser assembly
removal” on page 4-25
.
Go to step 3.
3 Does the distance measure 37.7, 55, or
78.5 mm? Replace the ITU. See
“Image transfer unit (ITU)”
on page 4-35
.
Go to step 4.
4 Does the distance measure 43.9 mm or 45.5? Replace the developers that
match the missing color
(black, cyan, magenta, or
yellow). See
“Developer
unit removal” on
page 4-42
.
Check the various rollers in
the printer for debris.
Y112730-2