HP 1055CMHP - Manual (Page 21)

Troubleshooting
1-9 HP DesignJets 1050C and 1055CM Printers Service Manual
Problems with the Vacuum Fan
If you have problems loading either Roll or Sheet Media, then there
could be a problem with the Vacuum Fan. To verify if there really is
a problem with the Vacuum Fan, try the following:
1 With the Printer ON, open the Window of the Printer and place a
sheet of HP High Gloss Photo Paper (must be D-Size), aligned with
the blue lines on the Center Platen. If the Vacuum Fan holds the
sheet in place, and then loads it correctly, then the Vacuum Fan
functions correctly. If the Vacuum Fan does not hold the sheet in
place (no suction), then try the following:
n Check that the holes in the Center Platen are NOT blocked.
n Check that the Vacuum Fan is installed correctly.
n Replace the Vacuum Fan
⇒
Page 8-11.
2 If the Vacuum Fan held the sheet in place, but couldn’t correctly
load it, then there could be a problem with the Overdrive. In this
case, replace the Platen Assembly
⇒
Page 8-63.
Vacuum suction much lower at high altitudes
At altitudes above 3,000 meters, the vacuum force holding down the
media will be lower, therefore the media will not be held in place
properly causing:
n Ink Smearing on the Media.
n Printhead crashes against the Media.
n Cut Sheet loading problems (high probability).
n Roll Media loading problems (low probability).
PRINTER LIMITATION - NO SOLUTION AVAILABLE.
Bin marks on prints done on HP High Gloss media
Prints done on HP High Gloss media are sensitive to scratches when
they fall into the media bin. To solve the problem, try the following:
n Advise the customer to install the Media Bin cover, that was
included with the Printer, to avoid this problem.
n If possible, advise the customer to hold the prints and prevent
them from falling in to the bin.