Tektronix Phaser 780 Color, Service Quick Reference Manual

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Service Guide
63
Media jams and the paper path
Skewed image
The image area is twisted or is not parallel with the sides of the page. The printer
neither jams nor displays an error code.
1. Check that the paper tray’s metal hooks (at the corners of the leading
edge of the paper in the tray) are not bent or deformed.
2.
Feed paper out of each of the available paper feeders. Does the image
skew when fed out of one tray but not when fed out of the others? If yes,
Inspect the paper and tray of the feeder that is skewing to ensure the tray
is correctly loaded and the paper is good.
3. Replace the multi-purpose tray pick-up roller or the main tray feed roller.
4. Print a test print and slide the paper feeder out about 10 seconds after
pressing PRINT. Carefully slide the paper feeder out of the printer and
inspect the position of the sheet of paper. Is the sheet of paper parallel to
the edges of the paper feeder? If not, replace the turn roller assembly.
5. Generate a test print and slide the fuser out of the printer just as the sheet
of paper is moving through the registration rollers. Carefully slide the
paper feeder out of the printer and inspect the position of the sheet of
paper. Is the sheet of paper parallel to the edges of the paper feeder as it
leaves the registration rollers? If no, clean or replace the feeder rubber
registration roller.
6. Remove second bias transfer roller. Manually raise and lower the cam
levers at the ends of the second bias transfer roller. Are the cam levers
undamaged? When you raise the levers does the second bias transfer
roller lower and when you release the levers does the second bias transfer
roller raise? Do the cam levers have a strong spring action? If not, replace
the second bias transfer roller.