HP DesignJet 2500CP Service Manual page 23

3 Is the client using Best Mode on Coated Media in high humidity?
In this particular case, head crashes could occur due to worst casing.
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Recommend a change of media, print mode, or humidity conditions.
4 What is the Firmware Revision? (Only applicable to HP DesignJets
2500CP and 2000CP)
Must be A02.01 or more recent. If not, upgrade.
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Explanation In earlier releases of firmware a media jam/head
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crash can be caused at the start of a plot. This can occur in the
POME" pen alignment or closed loop color calibration, because the
leading edge of the media is brought back very close to the Media
Separator edge. If the edges cross, the media can lift up when it is
advanced, causing a media jam or head crash. It is more likely to
occur the more curled the media is.
5 Check the Media Separator (Only applicable to HP DesignJets
2500CP and 2000CP)
For units fabricated before Serial Numbers C4703A ESA7C04586 and
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C4704A ESA7C10343. If the Media Separator is detaching do not stick
it down again, as it will detach again. Also, never reposition a Media
Separator, because it has an extremely tight positioning tolerance. For
Media Separators that are lifting off the Overdrive Assembly, replace
the entire Overdrive Assembly.
Explanation The previous adhesive used under the Media
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Separator can detach from the Overdrive Assembly. New Overdrive
Assemblies use a much better adhesive - it can be easily
differentiated from the old adhesive because it is white instead of
transparent. The Media Separator should never be repositioned; it
has an extremely tight tolerance. If it is too far from the linear
blade it can cause media crashes against the Linear Blade. If it is
too close it can cause media jams between the leading edges of the
media and the Media Separator.
6 Did the failure occur at the end of the media roll?
There are two known failure modes in this case. One is with Vinyl media,
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in which case the end of the media was glued too strongly to the roll,
which can cause a head crash. The other is with Coated Media, where
some rolls have the final edge of the media bent in a C" shape which
could cause a head crash when passing under the carriage. In both cases
the problem has been fixed and a new roll of media should solve it.
7 Replace the Overdrive Assembly and the Clutch ' page 8 69.
Explanation For a unit fabricated before September of 1997 the
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clutch could cause intermittent media jams. Refer to the applicable
Service Note. For a printer fabricated before July 1997 the linear blade
could be too high, causing media jams.
Troubleshooting
HP DesignJet CP Series Printers
1-11