HP Designjet 2000/3000cp HP DesignJet 2500/2000CP Printer - User's Guide - Page 202

Checking Printheads, For Sheet Media

Page 202 highlights

Controlling Image Quality Servicing the Printheads Checking Printheads IMAGE QUALITY Printhead service Check= Default: Frequency=10 The printhead check function prints a test pattern and then analyzes the pattern to determine if any printhead nozzles are not placing ink on the media correctly. If nonfunctional nozzles are found, the printer will switch to other nozzles on the printhead to prevent any degradation in image quality. Eventually it will perform a set of actions to bring them to a better working condition. In this way, the printer is able to compensate for nonfunctional nozzles on the printheads. For most users, the factory default frequency will provide the expected image quality without any intervention. However, for your convenience, you can set the check more frequently (up to every page) or disable it. The Extended margins setting must be selected in order for the leading and trailing edges of an image to be error-corrected for nonfunctional nozzles. The selections in this menu are: Now This selection causes the printer to perform a printhead check immediately. Off The printhead check functions is turned off. Printhead checks are done only when you replace an ink system. Frequency= This setting lets you select the frequency that printhead checks are made. You can select a printhead check to be done from every tenth page printed to every page printed. For Roll Media For Sheet Media NOTE The printhead check is done: s at the selected frequency s whenever you replace an ink system s when the power is switched off and then switched back on s on request. The printhead check is turned off automatically. To check the printheads, load an A3 or larger sheet in landscape orientation (wide side of sheet first) and select Check= Now in the Printhead service menu. See page 3-39, Loading sheet media, for sheet loading instructions. If you are using a third-party Raster Image Processor (RIP) to print with your printer, the printer may not be able to switch to other nozzles. In this case, the printer will attempt to recover the nozzles. 9-6

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Controlling Image Quality
Servicing the Printheads
9-6
Checking Printheads
The printhead check function prints a test pattern and then analyzes the pattern to
determine if any printhead nozzles are not placing ink on the media correctly. If
nonfunctional nozzles are found, the printer will switch to other nozzles on the
printhead to prevent any degradation in image quality. Eventually it will perform a
set of actions to bring them to a better working condition. In this way, the printer is
able to compensate for nonfunctional nozzles on the printheads.
For most users, the factory default frequency will provide the expected image
quality without any intervention. However, for your convenience, you can set the
check more frequently (up to every page) or disable it.
The
Extended
margins setting must be selected in order for the leading and trailing
edges of an image to be error-corrected for nonfunctional nozzles. The selections in
this menu are:
For Roll Media
The printhead check is done:
at the selected frequency
whenever you replace an ink system
when the power is switched off and then switched back on
on request.
For Sheet Media
The printhead check is turned off automatically. To check the printheads, load an
A3 or larger sheet in landscape orientation (wide side of sheet first) and select
Check= Now
in the Printhead service menu. See page 3-39,
Loading sheet media
,
for sheet loading instructions.
NOTE
If you are using a third-party Raster Image Processor (RIP) to print with your
printer, the printer may not be able to switch to other nozzles. In this case, the
printer will attempt to recover the nozzles.
Now
This selection causes the printer to perform a printhead check
immediately.
Off
The printhead check functions is turned off. Printhead checks are
done only when you replace an ink system.
Frequency=
This setting lets you select the frequency that printhead checks are
made. You can select a printhead check to be done from every tenth
page printed to every page printed.
IMAGE QUALITY
Printhead service
Check=
Default: Frequency=10