Message | Possible cause | Solution |
Unknown USB | The connected | Disconnect the current USB |
device | USB device is not | connection and connect to |
| a printer. | your printer. |
|
|
|
Unsupported | The printer is an | Disconnect the USB cable, |
printer | unsupported | and connect to a |
| device. | supported printer, such as |
|
| HP Photosmart or HP |
|
| Deskjet. |
|
|
|
Unable to | The printer has a | Check the printer. |
communicate with | problem. |
|
printer |
|
|
|
|
|
Disengage photo | The selected | Disengage the printer |
tray | paper size | photo tray, or change the |
| cannot be used | paper size. |
| with the printer |
|
| photo tray |
|
|
|
|
Printer top cover | The printer is | Close the top cover of the |
is open | open. | printer. |
|
|
|
Incorrect or | The printer | Install a new printer |
missing print | cartridge is the | cartridge, turn the printer |
cartridge | incorrect model | off, then turn it back on. |
| or is missing. |
|
|
|
|
Printer has a | There is a paper | Turn off the printer. Clear |
paper jam. | jam or the | the paper jam, and then |
| printer carriage | turn on the printer. |
| has stalled. |
|
|
|
|
58 | hp photosmart 720 user’s manual |