Solution

Change the parallel port interface setting on the ECOSYS printer to ‘Normal’.

How to do this

Setting via the Front Panel (Excluding the FS-600, FS-680, FS-1000(+), FS-1010, and FS-1020D)

Press MODE SELECT button on the front panel of the printer.
Press the +or - keys until 'Interface Parallel' is displayed.
Press the FORM FREE key to select the sub-menu, the display should now show 'Parallel I/F Auto'.
Press the ENTER button and a '?' will be displayed by 'Auto'
Press the + to change the setting to 'Normal' and the ENTER key to save the change.
Press MODE SELECT to exit the settings menu

or by sending a command via the MS-DOS prompt (using Prescribe) by typing:

ECHO !R! FRPO OØ,Ø;EXIT; >LPT1