What are the front panel error messages for ink cartridges?
The front panel can display the following ink cartridge error messages: Cartridge Missing, Faulty Cartridge, Cartridge Nearly Reached End of Life, and Cartridge Empty. Note that if a cartridge has actually passed its expiry date, it will be shown as a faulty cartridge and will need to be replaced. (Page 59)
From the official HP Designjet 500 Printer manual, page 59
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