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Phaser 840/850/860/8200 Color Printer - Service Manual
Note
Defects revealed by the prints may not show up at all in the course
of ordinary printing. In servicing the printer, you should minimize
the defects shown by the prints but not necessarily eliminate them.
1: X-axis motion
These prints reveal problems with the X-axis
motion of the printhead. Look for:
1. A thin white line and black line are normally
present in the print
2. Uniform density. Look for uniform fill from the
left to the right edge of the print. Lack of
uniformity could be caused by
printhead-to-drum misalignment. Lack of
uniformity on the edge of the print may be
caused by incorrect transfix roller pressure. A
defective printhead can also cause uniformity
problems, particularly if the density difference
is about 1/3 of an A-size page wide.
Narrower density problems may be caused by
a paper preheater. Print Service Print 6.
3. Wrinkling. See Service Print 8.
Causes:
Gaps could either be caused by a
defective X-axis drive or by something else, such
as a wiring harness interfering with the
horizontal movement of the printhead. The ink
loader, without the top cover installed to secure
it in place, may rest too low and interfere with the
printhead’s motion. In this case the ink loader
should rest on extrusions on the printer’s side
frames. Also ensure that the spring under the
printhead is intact and free of ink.
In the second print, the jagged black bars in the
four purple columns should align horizontally. if
they do not, adjust the x-axis scale using the
procedure, "X-axis scale adjustment", on
page 4-149.
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3
4
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