the problem is the wait and diagnostics lights are flashing

Simultaneous flashing by both the “Diagnostic” and the “Wait (Warm-up)” lights may mean that that the scanning area needs cleaning.

1.For cleaning instructions see maintenance procedures on page 24.

2.Restart the scanner after cleaning.

If the Diagnostic and the Wait lights continue to flash after cleaning and restarting, then there may be camera position errors. See tell me about hp customer care on page 90.

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hp designjet 815mfp & scanner 4200