![background image](http://html.mh-extra.com/html/tektronix/phaser-840/phaser-840_quick-reference-manual_1078590147.webp)
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.
9923-118
9923-119
Summary of Contents for Phaser 840
Page 46: ...36 Phaser 840 Color Printer ...
Page 95: ...Service Guide 85 Clearing PostScript NVRAM menu item ...
Page 96: ...86 Phaser 840 Color Printer ...
Page 121: ...Service Guide 111 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 ...
Page 125: ...Service Guide 115 Figure 3 Paper path FRUs 0388 16 2 1 5 11 10 9 12 6 4 3 7 13 8 ...
Page 127: ...Service Guide 117 Figure 4 Motors and fans FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 129: ...Service Guide 119 Figure 5 Circuit boards FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 13 12 ...
Page 131: ...Service Guide 121 Figure 6 Solenoids and clutches FRUs 4 5 3 2 1 0388 23 ...
Page 137: ...Service Guide 127 Figure 9 High capacity PaperTray 0388 65a 1 2 ...
Page 142: ...132 Phaser 840 Color Printer ...
Page 154: ...144 Phaser 840 Color Printer ...