Media size sensing
The media size set for the media tray assembly is set by positioning the right media guide, unlocking the slider
lock, and sliding the rear paper guide. The rear paper guide triggers the movement of the auto size sensing
finger, which then sets the switches of the controller card board. The combination of on/o position of the three
switches provides information of the media sizes to the engine.
Media size Switch 1 Switch 2 Switch 3
Unknown OFF OFF OFF
A4 OFF OFF ON
Legal OFF ON OFF
B5 OFF ON ON
A5 ON OFF OFF
Executive ON OFF ON
Letter ONONOFF
Custom ON ON ON
Note: Media size sensing through on/o switch combination
Media level sensing
The media level for the media tray assembly is triggered by the actuator flag positioned in the two
photointerrupter sensors in the pick arm bracket assembly. The actuator flag blocks and unblocks the two
sensors in
dierent
sequence; it determines whether the paper tray is empty, low, or full.
250-sheet tray Sensor A Sensor B
Tray full unblocked unblocked
Tray low blocked unblocked
Tray empty blocked blocked
4062
Appendix C: Theory of operation
546
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