5-34 Phaser 8400/8500/8550 Color Printer
X-Axis Motion (Drop Mass
Evaluation)
(8400 only)
For X-Axis Motion problems, see "Analyzing
Service Test Prints" on page 5-33 (solid fill
prints).
This print is used by Engineering and
Manufacturing. The print must be printed on
Xerox Photo Paper. Using a lower grade paper
will result in inaccurate measurements.
Color Bands, RGBK Dither
The large, secondary colored areas in this print
reveal banding and weak jets.
Look for: Vertical “bars” or bands of much
lighter color or a different hue running in-line in
one or more of the solid fills.
Causes: A weak jet can cause banding; see
the Weak/Missing Jets test print (on
page 5-33). Banding can also be caused by
color-to-color misregistration. Use the
diagnostics to ensure that the printhead and
drum thermals are correct. Follow the
instructions on the "On-site Printhead
Troubleshooting Checklist (8400)" on page A-8
Test Print Examples (Continued)
s8500-049
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s8500-050
Banding
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