HP Deskjet 6840 Color Inkjet Printer - Manual (Page 56)

PictBridge lights are flashing
State of the lights Task
Connection light and the Error light are flashing
The printer has lost connection
with the camera while printing.
Check the USB connection.
Connection light is on and the Error light is
flashing
The camera has lost power.
Replace the camera batteries
or connect it to a power supply.
Connection light is on and the Error light flashes
twice
The camera has requested an
unsupported command.
HP Deskjet 6800 series printer
56