HP Designjet 4500 Series - User Guide
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Check that your printer's firmware is up to date. See
Update my printer's firmware.
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Check that you have the right settings in your software application.
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If you are seeing a problem only at the top of the page, see
A defect near the start of a print.
ENWW If I still have a problem 213
How do I... (Image
Diagnostics Print topics)