HP 2500C/CM - Manual (Page 47)

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To diagnose the faulty printhead:
1.
Open the Printhead Access Cover and unlock the printhead latch.
2. Remove the cyan, magenta and yellow printheads and close the
Printhead Access Cover.
3. The LCD Panel will display the message "DETECTING..." as it checks
the printhead.
4. If the message "B PRNT-HD FAULTY, PRESS " appears, it means that
the black printhead is faulty. If this happens, press the button.
Remove the Printhead Access Cover and replace with a new black
printhead. Fasten the printhead latch and close the Printhead Access
Cover to verify that the new printhead is working.
If the message "B PRNT-HD OK, PRESS " appears, it means that the
black printhead is working.
5. Follow the sequence found in step 4 with each of the remaining
printheads to verify functionality.
6. Isolate the faulty printhead by this method, and replace it with a new
one.
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