Missing Band In Direction Of Paper Travel - Tektronix PHASER 780 Service Quick Reference Manual

Missing band in direction of paper travel

Leading Edge
1.
Is the paper wrinkled, dimpled, or show any signs of having a high
moisture content? Load fresh, dry paper.
2. Print Service Print 1. Do the bands appear in all four colors, If yes, go to
Step 3, If not, go to Step 7.
3.
Remove the imaging unit. Inspect the empty cavity for a scrap of paper or
a toner blotch that could be blocking the laser window.
4.
Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
5. Remove the imaging unit.
6. Inspect the image on the drum. Is there a normal test print image, without
any vertical band deletions, visible on the drum? If yes, go to Step 9. If no,
go to Step 7.
7.
Remove the top cover.
8.
Turn the carousel frame and inspect the magnetic rollers of each of the
four developer assemblies. Do the magnetic rollers of each developer
assembly appear smooth, evenly formed, without any low spots, and
without obvious contamination? If yes, replace the imaging unit. If not,
replace the faulty developer assembly.
9. Inspect the image on the surface of the accumulator belt? Is there a
normal test image, without any band deletions, visible on the surface of
the accumulator belt? If no, replace the accumulator belt.
10. Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
48 Phaser 780 Color Printer
There are areas of the image that are
extremely light or are missing
entirely. These missing areas form
wide bands that run along the page
from leading edge to trailing edge in
the direction of paper travel (B-size
print shown). The printer displays no
error code.
Note
3041-40
A-size prints are processed
through the printer with the
short edge of the print parallel to
the direction of the paper path
making print artifacts parallel to
the short edge of the print.
In B-size prints are processed
through the printer with the long
edge of the print parallel to the
paper path making artifacts
parallel to the long axis of the
print.