Xerox Phaser 8400 Service Manual page 265

Test Print Examples (Continued)
Head-to-Drum Gap
(8400 only)
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 this printer's printhead rests on two
spacers on the ends of the drum 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 this
printer. If the gap is suspect, check that the
printhead is correctly and completely installed.
Manuf X-Axis (Scanner)
(8400 only)
This print is used by Manufacturing and
Engineering.
Print-Quality Troubleshooting
EFGHIJKLMNOPQ
EFGHIJKLMNOP
FGHIJKLMNOPQ
EFGHIJKLMNOPQ
EFGHIJKLMNOP
EFGHIJKLMNOP
s8500-055
5-39