Xerox Phaser 8400 Service Manual page 236

Test Print Examples (Continued)
11: Head-to-Drum Gap
These prints indicate if the gap between the
printhead and the drum is correct.
Lines: The horizontal lines of the print are
made up of long and short dashes. Inspect the
first and last 1/2 in. (12 mm) of the black lines
for the vertical distance between the short
dashes and long dashes.
A difference indicates the printhead gaps at
each end of the printhead are not equal.
Text: Examine each end of the band of text.
Look for fuzziness or differences between the
quality of the characters on the left and right
ends of the print.
A difference indicates the printhead gaps at
each end of the printhead are not equal.
The ends of the Phaser 8400 Printer printhead
rests on two spacers that hold the head-to-
drum gap under much tighter control than in
previous solid ink printers. There is no head-to-
drum adjustment possible in the Phaser 8400
Printer. If the gap is suspect, check that the
printhead is correctly and completely installed.
12: Manuf X-Axis (Scanner)
This print is used for Manufacturing and
Engineering evaluation of printhead
performance.
Print-Quality Troubleshooting
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