HP Designjet L25500 Printer Series - Maintenance and troubleshooting guide (second edition)

4 Hardware maintenance
For the tasks in this chapter, you may need the User Maintenance Kit that was provided with your printer.
Align the printheads
The printer performs printhead alignment whenever printheads are replaced. If no substrate is loaded when
a printhead is replaced, the printer will perform the alignment the next time you load substrate.
You may also be recommended to align the printheads to solve a print-quality problem.
Automatic alignment
First make sure that you have a roll of opaque, white substrate loaded in the printer. Colored substrates,
glossy canvas, and transparent materials such as translucent bond, clear film, tracing substrate, and vellum
are not suitable for automatic printhead alignment; for these substrates, you should align the printheads
manually (see
Manual alignment on page 11).
To request printhead alignment from the front panel (if the alignment is not performed automatically), select
the
icon, then select Image quality maintenance > Align printheads > Auto PH alignment.
To request printhead alignment from the Embedded Web Server, select the Setup tab, then select Align
printheads > Automatic PH alignment > Print.
The process takes about 10 minutes and starts immediately, unless an image is currently being printed. If a
print job is in process, the alignment will be done as soon as the current print job is finished.
Manual alignment
To request a manual printhead alignment from the front panel, select the icon, then select Image quality
maintenance > Align printheads > Manual PH alignment > Print alignment pattern.
To request manual printhead alignment from the Embedded Web Server, select the Setup tab, then select
Align printheads > Manual PH alignment > Print.
The printer prints 17 rows labelled from A to Q. Inspect the print and write down the number of the
straightest line in each row (for example, A:9).
ENWW Align the printheads 11