Tektronix Phaser 840, Руководство по обслуживанию

Страница: 78 / 207

Service Guide 67
Printing and print quality problems
Generally, print problems fall into the following six categories:
■
Streaks or lines in the prints
■
No printing
■ Printing too light or too dark
■
Poor quality printing
■
Image is offset or cut off
■
Wrinkling
Not printing
The printer processes a sheet of paper, but no image is printed on it.
1. No drive voltages to the printhead. Check for a loose connector
leading to the printhead.
2. Replace the power control board.
3. Refer to the topic “Evaluating the printhead and cap/wipe/purge
system” on page 80. A properly functioning printhead maintenance
system is essential for proper printhead operation.
4. Replace the printhead.
Streaks or lines across the print
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.
Replace the Y-axis motor.
3.
Replace the power control board.