HP Designjet T3500 Production eMFP - Manual (Page 165)

4. Close the blue cover and make sure that it is properly closed.
When the printhead has been inserted correctly and is accepted by the printer, the printer beeps.
NOTE: If the printer does not beep when you insert the printhead and the Replace message appears
on the front-panel display, the printhead may need to be reinserted.
5. Lower the scanner.
6. The front-panel display confirms that the printhead is correctly inserted. The printer starts checking
and preparing the printhead. The default routine process takes 10 minutes. If the printer finds problems
in preparing the printhead, it takes longer, up to 45 minutes. After the printhead is checked and
prepared, the printhead realignment procedure runs automatically if paper is loaded, see
Align the
printhead on page 240 .
7. You are recommended to perform a color calibration after inserting a new printhead. See Color
calibration on page 104 .
ENWW Insert the printhead 155