IIRC the LW+ would by default always print a test page. If you wanted to
suppress this you could remove the tray at power on as has already been
suggested, a more elegant solution was to send a small piece of postscript
code which would change the internal settings so that it would not print at
power on. I used to achieve this by putting the code together in an editor
then copying it to the serial port. If it has been turned off no doubt it
could be turned on. If I can find the code I will post it.