HP DesignJet 500 - Manual (Page 169)

Media & Ink Introduction Front-Panel Other Index Solutions
The Front-Panel Setup Menus Consumable Menus Internal Prints Navigation
Message
Descriptions
Printer
Options
XX21 Replace The printhead has reached a
degradation level that prevents
the printer producing
acceptable image quality
consistently. 1. If the quality of your prints is fine,
try a manual recovery and/or re-
insertion. After this the printer may
detect a recovery and will accept the
printhead.
2. If after a recovery the message
persists, and the quality of your
prints is unacceptable, replace the
printhead(s)
3. To continue printing press Enter.
Status
Numbers
XX ranges
from 00 - 55 Printhead Message
Description Procedure