Lexmark w850 Service Manual page 151

•
Sensor (stacker bin no media)
–
A photo-interrupter to detect that the stacker media bin is at the highest position, and also to detect
"no media"
–
When the actuator attached to the carriage assembly right enters the sensing area, the emitted light
is blocked, which turns the sensor to "H" (+5 V).
•
Sensor (stacker bin upper limit)
–
A photo-interrupter to detect the stacker media bin's abnormal elevation above the top position
(sensor (stacker bin no media) position)
–
When the actuator attached to the carriage assembly right enters the sensing area, the emitted light
is blocked, which turns the sensor to "H" (+5 V).
•
Sensor (stacker bin level encoder)
–
A photo-interrupter to count the pulse of the Encoder attached to the Shaft-Elevator.
–
The media volume in the stacker media bin is detected based on this count.
•
Stacker bin lift motor
–
A DC motor to elevate or lower the stacker media bin
–
Clockwise rotation elevates the tray, and counterclockwise rotation lowers the tray.
•
Media eject motor assembly
–
A stepper motor to eject stapled or non-stapled media to the stacker media bin
–
Clockwise rotation ejects media to the stacker media bin, and counterclockwise rotation reverses the
eject roll to feed the media from the punch to the compiler unit assembly.
•
Media eject clamp motor
A DC motor to elevate or lower the media eject clamp when feeding media from the punch to the compiler
unit assembly or from the compiler unit assembly to the stacker media bin
•
Sensor (media eject clamp HP)
–
A photo-interrupter to detect the set clamp home position
–
This sensor functions as a trigger to control On/Off of the set clamp clutch.
•
Media eject clutch
When this clutch is activated, it transmits the media eject motor assembly rotating power to the media eject
shaft assembly.
Sensor (stacker bin level 1)
Sensor (stacker bin level 2)
Sensor (stacker bin upper limit)
Sensor (stacker bin no media)
Media eject clutch
Eject clamp motor
Sensor (media
eject clamp HP)
Media eject
motor assembly
Sensor (media
eject shaft HP)
Sensor (stacker bin
Stacker bin
level encoder)
lift motor assembly
4024-XXX
3-29
Diagnostic aids