HP DesignJet 2500CP Service Manual page 139

6 Driver print quality configuration:
To clarify if the reason of the problem is related with the print mode
defined with the Non HP Driver try the following:
Print the same sample using the Non HP driver and their normal
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media.
Print one of the internal demos or print the Image Quality Print
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(details ' page 6 5) using HP Media and configuring the
plotter/printer as indicated previously.
If the output obtained using the HP Solution is good and the one obtained
through the 3rd party solution is bad, HP support organization should:
Communicate to the customer that the problem is not in the printer
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and that he should address it through the 3rd party vendor support
structure.
7 Service Accuracy Calibration (details ' page 5 16)
Perform Service Accuracy calibration" using HP Matte Film. If not
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available, use Coated media if required.
Print Quality HP DesignJet CP Series Printers 6-3