Pentax PocketJetII User Manual page 51

The POWER and DATA indicator lights are blinking
A data I/O error has occurred. This requires cycling the PocketJet
power off and on and then restarting the print job. Note that if previous
pages were successfully printed, only the unprinted pages need to be
resent. This can be accomplished using the application's print dialog.
The POWER indicator light is blinking and the
BATTERY indicator light is off
The thermal print head has overheated. Turn the printer off or wait
until the POWER indicator light stops blinking before you continue
printing. The print job will continue if you do NOT turn the printer off
and the print head cools down before a timeout occurs.
The POWER indicator light is blinking and the
BATTERY indicator light is on
The printer is attempting to charge the battery, but it is not receiving
any power. Make sure you have connected the printer to either an AC
power outlet (See page 2, "Connecting to an AC Outlet") or a DC
charging power adapter, page 3.
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