Tektronix Phaser 840, Quick Reference Manual

Page: 147 / 160

Service Guide
137
7: Dot position (scanner) - Printhead
diagnostic. This print is used for
manufacturing and engineering evaluation
of printhead performance.
8: YMCKRGB Solid Fills . These seven
prints show uniformity of fill.
Look for: Even, uniform fills throughout
each print. Wrinkles or deformity of the
paper itself caused by the print process
show up in duplexed solid fill prints at
standard or enhanced resolutions. To test
for wrinkling, print the YMCKRGB prints in
duplex mode at the standard resolution.
Causes: Weak jets or uneven drum
heating may cause uneven fills.
To solve wrinkling, try different print
media. Replace the drum maintenance
drawer 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 the
Reverse Text test
print.
The transfix pressure may be incorrect.
Perform the transfix spring adjustment
described in “Transfix roller pressure
spring adjustment” on page 72. As a last
resort, replace the drum/transfix
assembly.
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