Apple 12/640PS manual Installing the duplex printing unit

Many of the installation procedures describe working with the printer’s left and right sides and front and rear, as shown in the following illustration.

Left side (has removable cover) Rear side (ports)

Front side Right side

Installing the duplex printing unit

With the optional duplex printing unit, you can print on both sides of the paper (often called duplex printing or two-sided printing). You can only duplex print from the paper cassettes. You cannot duplex print from the multipurpose tray,

Note: The duplex printing unit requires a minimum of 12 MB memory in the printer. For instructions on adding printer RAM, see “Increasing the Printer RAM,” later in this chapter.

If you want to	You need this much printer memory
Turn on PhotoGrade or use the	12 MB
duplex printing option
Turn on PhotoGrade and duplex	20 MB
print on all size paper (except legal)
Turn on PhotoGrade and duplex	24 MB
print on all size paper (including legal)

134Chapter 5