HP Designjet 2500.3500cp Printer series - Manual (Page 261)

Troubleshooting
Solving Ink System Problems
11-41
If You Have Problems Reseating a Printhead
When printheads are installed, in extreme circumstances it is possible that
the printer will not recognize them. This will be visible on the front panel
with the message “Replace printhead” or “Check printhead / Abort” where
one or more of the squares are flashing. Each square represents a printhead,
with the flashing ones representing printheads where the printer has
detected a problem.
When you reseat or replace a printhead, the flashing filled square changes,
for one or two seconds, to an hour-glass. At this point, the printer is testing
the printhead. Don’t remove or insert another printhead while this test is
being done.
n If the test is successful, the hour-glass reverts to its normal non-flashing
filled state.
n If the test fails, the hour-glass will change back to a flashing filled
square. To correct this, make the following checks:
1 Remove all four printheads completely from the printer. On the front panel the
displayed message will change to show four flashing lights.
2 Look at the electrical contacts on the printhead and carriage. If they are dirty, they
should be cleaned (see page 11-42, Cleaning Electrical Contacts on page).
3 Reinstall each printhead, one at a time; if the flashing squares stop flashing, then the
printheads have passed the test. DO NOT INSERT THE NEXT PRINTHEAD
UNTIL THE PRINTER HAS ACCEPTED THE CURRENT ONE.
If the lights continue flashing and the printheads have been inserted correctly, try
reseating them a few more times, by removing the printhead from its stall and then
replacing it until it snaps correctly into position.
NOTE: Do not leave printheads partly inserted in the carriage; they may be making
electrical contact and be the cause of the reseating problem, as you try to reseat
other printheads.
If the printer still refuses to accept your printheads, try replacing the indicated ink
system (see 11-38, Checking Ink Systems) or call HP for assistance.
C4704034
Replace printhead
nn o n
C4704034
Check printhead
nn o n Abort ->