Apple LaserWriter 12/640 PS - Manual (Page 373)

Speed
m Simplex—12 pages per minute maximum using A4-size paper. Actual
speed depends on the images printed.
m Duplex—8 pages per minute maximum using U.S. letter-size paper. Actual
speed depends on the images printed.
Printer reliability (MTBF)
m Average number of prints between failure is 180,000 pages.
Toner cartridge life expectancy
m Life expectancy is 6,000 pages when printing text documents with average
page coverage (5% black). An example of a 5% black page coverage is a
page consisting of double-spaced 14-point courier type. Printing images
and other graphics may impact toner cartridge life expectancy.
Printing materials
16- to 28-pound laser-quality bond (60 to 90 g/m 2 ); up to 50-pound (190 g/m 2 )
stock when fed manually through the multipurpose tray and exited through
the face-up output tray. Accepts most textured and colored stock. Accepts
medium-weight photocopier transparencies and labels. Envelopes can be
printed from the multipurpose tray or from the optional envelope feeder.
The paper used should not scorch, melt, transfer material, or release
hazardous emissions when heated to 200° C (393° F) for 0.1 seconds.
Paper sizes and capacity
Supports U.S. letter, A4, B5, executive, and legal in the standard paper
cassette. The paper cassette holds 250 sheets of 20-pound (75 g/m
2 ) paper.
The multipurpose tray can hold up to 80 sheets of standard U.S. letter paper,
and other paper sizes from postcard up to U.S. legal. An optional 500-sheet
cassette is available that supports letter, A4, and U.S. legal-paper sizes. An
envelope feeder that can automatically feed up to 50 envelopes is also
available.
348 Appendix D