HP Deskjet 9800 Printer series - Manual (Page 104)

The printer is rejecting the pen
Poor contact between the print cartridges and print cartridge cradles may cause the pen to be
rejected. When this occurs, try cleaning the electrical contacts on the print cartridges and print
cartridge cradles:
1 Remove the print cartridge from the printer (see Installing or replacing the print cartridges ).
2 Clean the electrical contacts on the print cartridge cradle with a dry cotton swab.
94 6 Troubleshooting