White Horizontal Line Or Band In All The Colors Of A Print; White Vertical Lines In The Print; Dirty Background; Mis-Transfer, Missing Portions Of Toner - Tektronix Phaser 550 Service Manual

White horizontal line or band in all the colors of a print

1.
Replace the imaging unit.
2. Replace the second bias transfer roller. Inspect it for loose roller
contacts. Grease the end of the roller shaft with conductive grease.

White vertical lines in the print

1. Inspect the path the laser beam travels for foreign matter that could
block the beam from striking the photoconductive belt.
2. If the line is colored, one toner cartridge may not be outputting toner
correctly. Replace the missing color's toner cartridge.
3. Inspect the second bias transfer roller for a scratch or contamination.
Replace the roller if necessary.
4.
Are the fuser rollers scratched? Replace the fuser.

Dirty background

1. Inspect the scorotron charger for toner or other contamination.
2. If excess printing in background is of one primary color, replace that
color's toner cartridge.
3.
Replace the high-voltage board.

Mis-transfer, missing portions of toner

1. Inspect the heat roller (top roller) of the fuser for scratches or
contamination.
2. Replace the fuser.

Partial black dots

1.
Inspect the toner cartridge roller for scratches. Replace the toner
cartridge.
2. Inspect the photoconductive belt and accumulator belt for scratches.
Replace the imaging unit.
3. Inspect the fuser rollers for scratches or contamination. Replace the
fuser.
Troubleshooting
Service Manual 6-27
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