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Phaser 8400/8500/8550/8560 Color Printer Service Manual 5-41
Print-Quality Troubleshooting
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.
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