Streaks Or Lines In The Print Parallel To The Long Axis Of Printing; Scratches In The Transparency Parallel To The Long Axis Of Printing; White Portion Of Print Is Colored - Tektronix Phaser 380 Service Manual

6
Troubleshooting
6-14 Phaser 380 Color Printer

Streaks or lines in the print parallel to the long axis of printing

1.
Possible missing or weak jet. Print the Service Test Print 2 "Weak Jet"
to determine if a jet is not performing. Run a printhead cleaning cycle
to try to clean a clogged jet. Verify that the cap/wipe/purge unit
correctly seals to and properly purges the printhead. A puddle of ink
should be visible in the cap/wipe/purge unit after a purge. Refer to
"Vacuum check" on page 9-24. If necessary, turn off the printer and
allow the printhead to cool for at least 3 hours before retesting.
2.
Ensure that no wiring harness are interfering with the horizontal
slewing of the printhead. In such a case, the streaks or lines should be
parallel and evenly spaced.
3. The x-axis drive is not functioning correctly. If the x-axis drive does
not slew the printhead smoothly and evenly during printing, vertical
lines appear in the print. Print Service Test Print 1 "J-step" to reveal
an x-axis problem. Replace the x-axis drive, if indicated.
4.
Replace the power control board.
5. Replace the x-axis drive assembly. Ensure it is correctly adjusted.

Scratches in the transparency parallel to the long axis of printing

1. Usually caused by foreign debris in the paper path. Run a
transparency through the manual feed to see if the scratch appears on
the print. If it does not the scratch occurred in the paper pick and
early transport of the transparency film.
2. A scratch caused by the paper preheater can be caused by debris built
up on the heating surfaces. Run the front panel clean procedure
Clean: Ink smears. Additional, you can manually force a sheet of
thick 65 to 80# paper through the paper preheater to "buff" the paper
preheater heating surfaces. With the leading and trailing ends of the
sheet of paper extending from the entry and exit of paper preheater,
gently pull the sheet of paper back and forth several times and then
remove the sheet of paper. Be careful of the paper sensor flags.

White portion of print is colored

1.
Color on a print where no color should be printed is often called a
latent image. A latent image remains on the drum when it should
have been transferred to its sheet of paper. An insufficient amount of
oil on the drum, provided by a defective or old maintenance tray may
be the problem. Replace the maintenance tray.
2.
Replace the power control board.
3. Non-functioning printhead data cable. Replace the main board.
4. Replace the printhead.