Xerox Phaser 7700 Service Manual page 129

Random missing spots
There are small areas of the image
that are extremely light or are missing
entirely. These missing areas form
spots that are localized to small areas
of the page. The printer displays no
error code. A small number of
occasional missing spots is normal.
1.
If a toner low message is
displayed, replace the toner
cartridge in question.
2.
Ensure that the loaded media
matches the front panel settings.
3.
Run the Calibrate for Paper
routine. From the front panel's
Support Menu, select Improve
Print-Quality?, then select
Calibrate for Paper Menu.
4.
Run the solid fill test pages. From
the front panel's Printable Pages
Menu, select Service Pages, then
select Print Solid Fill Pages.
5. If the missing bands only occur in a single primary color, replace the Developer
Housing Assembly (RRP 27, on page 7-171).
Random spotting
There are spots of toner randomly scattered across the page. The printer displays
no error code.
Single Color
1. Remove the toner cartridge of the suspect color and shake it.
2. Check the print cartridges.
All Colors
1.
Inspect the paper path.
2.
Inspect the Accumulator Belt Cleaner and replace if necessary (RRP 36, on
page 7-182).
3.
Inspect the Bias Transfer Roller and replace if necessary (RRP 17, on page
7-158).
4.
Inspect the Fuser to see whether paper is wrapped around the Fuser.
5.
Replace the Fuser (RRP 19, on page 7-160).
3-106 Phaser 7700 Color Laser Printer
3041-46
3041-47