Tektronix Phaser 840, Quick Reference Manual

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Service Guide
15
Combination sensors and their meanings
Combinations of sensors are used by the printer to determine the type of standard
(or upper) media tray installed in the printer.
Media tray type sensing
The combinations of the three tray sensors inform the print engine what type of
media 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 by the presence
of sensor flags on the side of the tray.) The tray sensors are located on the
right-side interior of the paper tray slot, mounted on I/O board right. There are
four tray types:
■
Letter (A-size). This tray is sized for 8.5 x 11-inch (U.S.) paper as well as
low-volumes of A-size transparency film.
■
Metric Letter (A4-size). This tray is used for 210 x 297 mm (Metric)
paper as well as low-volumes of A4-size transparency film.
■
High-volume Transparency/Label (A). This tray supports high
volumes of U.S.-size transparency film as well as laser quality, adhesive
label stock.
■ High-volume Transparency/Label (A4). This tray supports high
volumes of Metric-size transparency film as well as laser quality,
adhesive label stock.
Table 1 Tray switch sensor combinations
Tray type A Paper A4 Paper A Transparency A4 Transparency
Top switch Closed Open Closed Open
Middle switch Open Closed Open Closed
Bottom switc h Open Open Closed Closed