Apple 12/640PS manual Checking the indicator lights, Light Off, Flashing

Checking the indicator lights

The lights on the front panel of the LaserWriter 12/640 PS indicate the printer’s operating status.

Light	On	Off
Ready/In Use	Printer is ready	Printer cannot print
	to use.	because of an error,
		or the cover is open,
		or the printer is
		turned off.
Paper Out	Paper cassette	Paper supply is OK.
	is empty.
Paper Jam	There is a paper	Paper is OK
	jam.

Flashing

Printer is warming up, printing a startup page, or processing data for the next print job.

Printer is ready for sheet of manual-feed paper.

Toner cartridge is. not installed.

If the Paper Out and Paper Jam lights flash alternately, or all three lights stay on, the printer requires service. If you have just installed additional memory (RAM) in the printer, there may be a problem with the memory. Open the printer and make sure the SIMMs are fully seated in the correct sockets that match one of the supported configurations listed in Chapter 5 and in Appendix D.

290Chapter 12