182
Phaser 840 and 850 Color Printers
7: Manuf. 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. Check to
see if 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 110. As a last
resort, replace the drum/transfix
assembly.
9923-118
9923-119
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...