HP Scitex FB910 HP Scitex FB910 Printer Series - User Manual - Page 136

Head Strike or Carriage Motion Error, Head Strike Recovery, Cause, What to

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control panel to see whether the correct media is selected. Head strikes may indicate that the printhead height is too low; see "Head Height Off Media" on page 512 for instructions. If head strikes become a recur frequently, contact technical support for an edge retainer that can be attached to the printer. Head Strike or Carriage Motion Error Cause: Head height is set automatically with a media thickness sensor and moving carriage rail. The most likely causes of a head strike: Media is bowed ("non-flat") and a media edge is sticking up where the carriage will hit it when either the input or ouput roller is not in a position to hold it down (either rollers are not being used or the leading/trailing edge of the media does not reach the pinch roller). Media is bent. Some edge or corner has been damaged so that even though the media is relatively flat, the bent edge sticks up into the carriage space. What to do: Inspect the media for bowing, warping, and folding. Do not print on any media that cannot be flattened. Select warped (non-flat media) during configuration so that the front and back pinch rollers are used to hold down the media (note: this reduces significantly the available print zone). Head Strike Recovery A head strike occurs when the media comes in contact with the bottom of the carriage while the carriage is in motion. The printer carriage is designed to protect the printheads from contact in the event of a head strike on media. It is important, however, to take steps after a head strike event to assure that the printheads have not come in contact with partially-cured ink. Following a head strike, it may be possible to observe all known working jets firing correctly in the Prime Bar pattern or other printing. Even when the Prime Bars appear visually correct, the printheads should be manually cleaned immediately after a head strike to ensure that no partially cured ink has been scraped from the media and deposited on or near the printhead orifices. The ink will continue to cure at a low rate and could enter an orifice and cure the ink in the orifice even without subsequent exposure of the orifice area to UV. Once the ink starts to cure it continues for some time at a slow rate. B-4 Troubleshooting Checklist

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B-4
Troubleshooting Checklist
control panel to see whether the correct media is
selected. Head strikes may indicate that the printhead
height is too low; see “Head Height Off Media” on page 5-
12 for instructions. If head strikes become a recur fre-
quently, contact technical support for an edge retainer
that can be attached to the printer.
Head Strike or Carriage
Motion Error
Cause:
Head height is set automatically with a media thickness
sensor and moving carriage rail. The most likely causes of a
head strike:
Media is bowed ("non-flat") and a media edge is sticking up
where the carriage will hit it when either the input or ouput roller
is not in a position to hold it down (either rollers are not being
used or the leading/trailing edge of the media does not reach the
pinch roller).
Media is bent. Some edge or corner has been damaged so that
even though the media is relatively flat, the bent edge sticks up
into the carriage space.
What to do:
Inspect the media for bowing, warping, and folding.
Do not print on any media that cannot be flattened. Select
warped (non-flat media) during configuration so that the front
and back pinch rollers are used to hold down the media (note:
this reduces significantly the available print zone).
Head Strike Recovery
A head strike occurs when the media comes in contact with the
bottom of the carriage while the carriage is in motion. The printer
carriage is designed to protect the printheads from contact in the
event of a head strike on media. It is important, however, to take
steps after a head strike event to assure that the printheads
have not come in contact with partially-cured ink.
Following a head strike, it may be possible to observe all known
working jets firing correctly in the Prime Bar pattern or other
printing. Even when the Prime Bars appear visually correct, the
printheads should be manually cleaned immediately after a head
strike to ensure that no partially cured ink has been scraped from
the media and deposited on or near the printhead orifices.
The ink will continue to cure at a low rate and could enter an ori-
fice and cure the ink in the orifice even without subsequent
exposure of the orifice area to UV.
Once the ink starts to cure it
continues for some time at a slow rate.