After pressing the printscreen button, you should see a flashing green light on the Stylewriter 6500. After the job is processed, the orange resume light will blink. After you see the orange light, press the resume button right next to it. The printer will pull in a sheet of paper and the printscreen job will print.
If this does not work, or the lights blink back and forth on the printer, be certain that you only have a PC connected to the parallel port of the StyleWriter 6500 and do not have a Macintosh simultaneously connected to the RS-422 port of the printer.