Tektronix Phaser 780 Color, Service Quick Reference Manual

Page: 67 / 234

Service Guide
53
8. Remove the top cover. Turn the carousel frame and inspect the magnet
roller of each of the four developer assemblies. Do the magnet rollers of
each developer assembly appear smooth, evenly formed, without any low
spots, and without obvious contamination? If not, replace the defective
developer assembly.
9. Replace the high voltage power supply.
Banding
There are three kinds of banding:
1. If a dark band appears every 364 mm from the leading edge of a B-size
print or occasionally on A-size print, reseat the imaging unit and print
again. If the problem persists perform the procedure “Adjusting for
impulse banding” on page 74.
2. If a dark band appears at a 1.3 to 1.7 mm pitch throughout solid fills,
replace the process drive assembly.
3. Dark bands appearing randomly in solid fills at pitches such as 44 mm, 88
mm or 104 mm. Replace the process drive assembly.
Edge of print is wrinkled with an area of ragged discoloration.
The fuser roll cartridge is out of position.
1.
Reseat the fuser roll cartridge
3041-44
3041-45