HP Designjet 2500.3500cp Printer series - Manual (Page 257)

Troubleshooting
Solving Ink System Problems
11-37
Printhead Checks
Your printer makes a printhead check at the frequency set in the Image Quality /
Printhead Service / Printheads Check / Frequency front-panel menu. This check
is also made when you power the printer on, when you explicitly request a check
through Image Quality / Printhead Service / Printheads Check / Now, or when a
pen is installed or reseated. You can disable the frequency checking through Image
Quality / Printhead Service / Printheads Check / Off. (This does not disable
checking at other times).
Using the Replace Ink System Key
The Replace Ink System key can be used to check what is wrong with the ink
system. If you think you know which part of the ink system is giving trouble (see
11-32, Summary of Ink System Defect Messages and the list of messages on page
12-2, Message Explanations and Actions), focus on that section, but if you are not
sure, try all the steps carefully.
The Replace Ink System key lets you access all components of the ink system,
even if there is no reported error in any component. (When you start replacing
components following a prompt from the front panel, the printer only gives you
access to those components for which an error has been detected.)
Use the checklists on page 11-38, Checking Ink Systems.