HP Designjet Z3100 Photo Printer series - Manual (Page 157)

2. To avoid an electric shock, switch the printer off and unplugged it.
3. Open the transparent window.
4. Find the printhead drop detector beside the stored printhead carriage.
5. Remove any debris blocking the printhead drop detector.
6. With a dry lint free cloth, wipe the surface of the drop detector to remove any non-visible debris.
ENWW Clean the printhead drop detector 147
Troubleshooting ink
cartridg
e and
printhead
issues