Tektronix Phaser 380 Service Manual page 333

Service Test Print 7 - Printhead diagnostic. This
print is used for manufacturing and engineering
evaluation of printhead performance.
Service Test Print 8 - Solid fills. These seven prints
show uniformity of fill. The test print can be
canceled at any time.
Look for: Even, uniform fills throughout each print.
Wrinkles or deformity of the paper itself caused by
the print process show up in blue and green prints
at 600 dpi before other colors. A slight amount of
wrinkling in green fills at 600 dpi is normal. But
there should be no wrinkling in 600 dpi blue fills.
Causes: Weak jets or uneven drum heating may
cause uneven fills.
To solve wrinkling, try different print media. Replace
the drum maintenance tray to correct streaking.
Check the drum temperature sensor for debris
build-up on the sensor or the sensor is in improper
contact with the drum. Refer to Test Print 4.
Check to see if the transfix pressure is incorrect
and adjust the transfix roller pressure spring
stacks, if necessary. Replace the drum/transfix
assembly.
Replace the transfix roller or the pressure spring
stacks.
Test Patterns
9661-162
9661-104
Service Manual B-5
B