Hp Designjet 4520 Printer series User Manual download pdf (Page 132)

Here are three examples of a black rectangle in close-up, showing the fine lines of which it is made:

In the first two examples above, there are so many missing lines that the printhead may be faulty. In the

third case there are only a few missing lines, which are acceptable, because the printer can compensate

for such minor problems.

Corrective action

If part 3 shows a problem with one printhead, but part 2 shows no problem, there is no immediate need

to take any corrective action, because the printer is able to compensate for the problem and maintain

print quality. However, if part 2 also shows a problem, continue as follows:

1. Clean the printheads. See

Recover (clean) the printheads on page 97.

2. If there is no improvement in print quality, replace the printhead that shows the problem. See

Remove a printhead on page 92 and Insert a printhead on page 94.

If I still have a problem

If the entire Image Diagnostics Print contains no defects and you still experience print quality problems,

here are some things to check:

●

Try using a higher print quality option. See

Choose print quality settings on page 57 and Change

the print quality on page 57.

●

Check the driver you are using to print with. If it is a non-HP driver, download the correct HP driver

from the Web: see

Update my printer's software on page 116.

●

If you are using a non-HP RIP, its settings may be incorrect. Refer to the documentation that came

with the RIP.

●

Check that your printer's firmware is up to date. See

Update my printer's firmware on page 116.

122 Chapter 12 How do I... (Image Diagnostics Print topics) ENWW

Diagnostics

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Hp Designjet 4520 Printer series User Manual Page 132