Paper Tray Type Sensing; Tray Switch Sensors And Actuators; Paper Size Detection - Tektronix 1235N - Phaser Color Laser Printer Service Manual

Paper tray type sensing

The positions of four tab pieces are set according to the position of the paper guide. A
cam interlocks the tabs with the paper guide of the paper tray.
Upon insertion of the tray in the printer, four actuator tabs activate four switches. The
combinations of the tab position indicate the size of the paper in the tray.

Paper size detection

State of Microswitch
SW1 SW2
(top)
0 0
0 1
0 1
0 0
1 1
1 0
1 1
1 1
1 0
Rotating sensor actuators
(side of tray)

Tray switch sensors and actuators

SW3 SW4
(bottom)
0 0
1 1
0 1
1 1
1 0
1 1
0 1
0 0
0 1
Tray switch sensors and actuators
Paper Size
No tray installed
Letter
Executive
A4
Legal 14
Legal 13
B5
A5
A6
Paper size sensors
0728-04
Service Guide 15