HP PageWriter XL M1705B Service Manual page 130

In Table 6-1, the corrective action "Cycle power" means to press the
key repeatedly to turn the cardiograph to Standby and
back to On.
Tip .I
tit
If the cardiograph will not turn on or operate and displays an error
code, the preview logic board may be defective and causing these
symptoms. Try disconnecting the preview logic board to eliminate it
as the source of the power-on problems.
Troubleshooting 6-7