Head Strike Recovery - Oce CS7075 User Manual

Head Strike Recovery

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◆ Head strike — if the printhead is striking the media,
check how the media is tracking from the supply spool
to the takeup spool. The sides of the media should be
parallel to the sides of the printer, with no wrinkling or
buckling. If necessary, reload the media. See "Loading
Roll-Fed Media" on page 3-14 for instructions. Also check
the Media Wizard to see whether the correct media is
selected (see "Media Wizard" on page 3-41). Head
strikes may indicate that the printhead height is too low;
see "Set the Printhead Height" on page 5-1 1 for instruc-
tions. If head strikes become a recur frequently, contact
Océ Display Graphics Systems Technical Services for an
edge retainer that can be attached to the printer.
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 con-
tact in the event of a head strike on media. It is important, how-
ever, 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. Océ Display Graphics Systems recommends that even
when the Prime Bars appear visually correct, the printheads 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.
If previously known working jets are visually found to be miss-
ing from the Prime Bars after a head strike, a standard Purge
should also be performed as part of the cleaning. The proce-
dures for cleaning the UV printheads follows below.
1. Remove the left-side parking station from the printer.
2. Select "Access printheads" from the control panel, OR, at
your option, select "Purge" from the control panel to perform
a standard Air Purge.
The carriage will travel to the left side, allowing access to the
printhead jetting orifices.
3. Moisten an approved cleaning cloth with Océ IJC700 UV Print
Head Flush Solution.
Troubleshooting Checklist