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Troubleshooting Checklist B-7
Banding Cause: (Sheet-fed printing) The media encountered an obstruc-
tion, such as the operator touching the media during printing; or
the media slipped on the media drive belt due to being warped
(not flat); or there was a problem with the media drive belt
encoder.
(Roll-fed printing) There may be a media feed error.
What to do: (Sheet-fed printing) Do not touch the media during
printing. Use flat media. If the media has a slight bow, use the
media rollers to hold the media flat against the media drive belt.
Clean the media drive belt and its encoder (see “Clean the
Media Drive Belt and Encoder” on page 6-4). If regularly-spaced
blank bands or overlapping bands appear, the encoder may be
damaged or misaligned; in this case, contact your Authorized
Service Provider or Technical Services.
(Roll-fed printing) Perform a Media Feed Calibration to ensure
accurate media advance.
Shutter Errors The UV curing system uses shutters to block and expose the UV
lamps as needed to cure jetted ink or prevent curing of the ink on
the printheads.
A control panel warning message appears if the shutters
become jammed shut or closed, or if a sensor indicates they are
not opening or closing as required (this will not interrupt printing):
• If the shutters appear to be opening and closing, simply
reset the warning message and proceed with printing.
• If one of the shutters appears to be jammed open or closed,
report this to Technical Services for a possible repair. In this
case, you can continue printing unidirectionally with the
working lamp. For performance similar to bidirectional print-
ing, print right-to-left with the user-side lamp, or print left-to-
right with the service-side lamp.
• If either shutter is jammed open, you may continue printing
on thinner media (less than 0.5 inches/127 mm); printing on
thicker media is not recommended due to UV light exposure
when the lamps are off the media.