Tektronix PHASER 380, Service Manual

Page: 153 / 346

Service Manual 6-13
Troubleshooting
6
4. If the motor’s winding resistances are within specification, inspect the
wiring harness for nicks, crimps, opens or other problems. If the
harness is functional, then replace the power control board.
5. Inspect the gear train on the inside of the printer frame; look for
stripped gears or broken teeth.
Media skews passing through the paper path
1. Check to see if the media is excessively curled. Curled media can get
mistracked in the paper path. Most papers curl in high-humidity.
2. Examine the paper path; ensure it is clear of obstructions.
3. Ensure that the pick roller and the feed rollers are clean so that a sheet
of media is picked and fed smoothly and evenly.
4.
Check the upper and lower feed rollers operate correctly. Also make
sure that the front door is properly closed.
5. Test the media width sensor assembly using the diagnostics discussed
in the later topic “PC-based diagnostics” on page 6-24.
Printing and print quality problems
Generally, print problems fall into the following five categories:
■
Streaks or lines in the prints
■
No printing
■
Printing too light or too dark
■
Image is offset or cut off
■
Wrinkling
Streaks or lines in the print parallel to the short axis of printing
1. Check the y-axis belt tension. If the y-axis drive is not smoothly and
consistently rotating the drum, horizontal bands or lines appear in the
print.
2. Check, clean or replace the Y-axis drum encoder disk.
3. Replace the Y-axis motor or the Y-axis drive assembly. Ensure the
Y-axis is correctly tensioned.
4.
Replace the power control board.