Media Tray Type Sensing; Table 1-2 Tray Switch Sensor Combinations (Main Engine Feeder); Table 1-3 Tray Switch Sensor Combinations (Lower Tray Assembly) - Tektronix Phaser 440 Service Manual

Media tray type sensing

The combinations of the three tray sensors "tell" the Phaser 440 print engine
what type of paper tray is installed. (The print engine does not detect the type of
media installed in the tray; it only detects the particular tray being used.) The
tray sensors are located on the right-side interior of the paper tray slot. There are
three tray types:
Letter (A-size). This tray is sized for 8.5 x 11-inch paper and
transparency film. A slide switch on the side of the media tray lets
you select either paper or transparency film.
Metric Letter (A4-size). This tray is used for 210 x 297 mm paper and
transparency film. A slide switch on the side of the media tray lets
you select either paper or transparency film.
Universal. This tray is used for A, A4, and Letter Extra paper and A
and A4 transparency film. The extra-long and wide Letter Extra paper
allows users to print full-page bleeds. After cutting the print down to
either 8.5 x 11 inches or 210 x 297 mm, the result is an A- or A4-size
print in which the image bleeds off all four of the paper's edges with
no unprinted margins. A slide switch on the side of the media tray lets
you select either A, A4 or Letter Extra as well as paper or transparency
film. The Universal tray can only be used in the printer's main tray
feeder; the Lower Tray Assembly accepts only the Letter (A-size) and
Metric Letter (A4-size) trays.

Table 1-2 Tray switch sensor combinations (main engine feeder)

Top switch Middle switch
Closed Closed
Open Closed
Closed Open
Open Open
Closed Closed
Open Closed
Lower Tray Assembly. A different switch combination scheme is used to
determine the type of tray (referred to as the lower tray) installed in the Lower
Tray Assembly. (The Lower Tray Assembly is sometimes referred to as the second
feeder .)

Table 1-3 Tray switch sensor combinations (Lower Tray Assembly)

Top switch Middle switch
Open Closed
Closed Open
Open Closed
Closed Open
Bottom switch Tray type
Open Letter Extra paper
not used
Open
Closed Letter (A-size) paper
Closed Letter (A-size) transparency film
Closed Metric Letter (A4-size) paper
Closed Metric Letter (A4)-size transparency film
Bottom switch Tray type
Open Letter (A-size) paper
Open Letter (A-size) transparency film
Closed Metric Letter (A4-size) paper
Closed Metric Letter (A4-size) transparency film
General Information
Service Manual 1-7
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