5 Installing Options

The LaserWriter 12/640 PS has several user-installable printer options. You can add a duplex printing unit, a 500-sheet cassette and feeder, an envelope cassette (the envelope cassette fits into the 500-sheet feeder), and

aface-up output tray. You can also increase the printer’s random-access memory (RAM).

This chapter provides instructions for installing your paper-handling options and increasing RAM.

WARNING When installing any of the options described in this chapter, except for the face-up output tray, be sure the printer is turned off.

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Apple 12/640PS manual Installing Options