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Phaser 840 and 850 Color Printers
11: Head-to-Drum Gap
. This print
indicates if the gap between the printhead
and the drum is correct.
Lines
. The horizontal lines of the print are
made up of long lines and short dashes. If
the dashes are positioned above the lines,
then the drum gap is too wide.
If the dashes are positioned below the
lines, then the drum gap is too narrow.
Also examine each end of the band of
text. Look for differences between the
quality of the characters on the left and
right ends of the print. A difference
indicates that the printhead is misaligned.
Text
. Look for text that is fuzzy or text that
differs in quality from one side of the print
to the other. Either condition indicates
that the printhead-to-drum gap is
incorrect.
Perform the procedure “Printhead-to-drum
spacing adjustment (Phaser 840 printer)”
on page 102. Generally the Phaser 850
printer. should never require this
adjustment
12.: Manuf. x-axis (scanner)
. This print
is used for manufacturing and engineering
evaluation of printhead performance.
0388-39
Time_to_Drum/Head_to_Drum test print:
Short dashes above the line indicate large time_to_drum and/or large head_to_drum gap.
Short dashes below the line indicate small time_to_drum and/or small head_to_drum gap.
EFGHIJKLMNOPQ
EFGHIJKLMNOP
FGHIJKLMNOPQ
EFGHIJKLMNOPQ
EFGHIJKLMNOP
EFGHIJKLMNOP
Indicates
that head-to-drum
gap is too small
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 ...