Stapler Unit Assembly; Functions Of Stapler Sensors/Motors - Lexmark X850e Service Manual

Stapler unit assembly

The stapling operation is executed by closing the stapler unit assembly.
The stapler unit assembly, containing the staple motor, the sensor (staple home), the sensor (self priming), and
the sensor (low staple), is activated by the staple motor.
Forward (clockwise) rotation of the motor drives the stapler to staple a set of sheets, and returns the stapling unit
to the home position.
If stapling fails, the motor rotates reversely (counterclockwise) to return the stapler unit assembly to the home
position.
When staples become low, the low staple sensor detects it, and stapling stops automatically, displaying an
alarm message. The message is also displayed when the staple cartridge is not installed.
Sensor (low staple)
Stapler unit motor

Functions of stapler sensors/motors

• Sensor (stapler carriage HP)
—
A photo-interrupter sensor that detects the stapler home position, rear staple (corner) position, and rear
staple (straight) position
—
It turns high (+5 V dc) (light blocking) when the stapler comes to the specified position.
• Stapler carriage motor assembly
—
A stepping motor that moves the stapler unit assembly
—
Clockwise rotation of this motor moves the stapler unit assembly to the rear side, while counterclockwise
rotation moves the stapler unit assembly to the front side.
• Sensor (low staple) in the stapler unit assembly
—
A photo-interrupter sensor that detects when the stapler unit assembly is nearly out of staples
—
It turns high (+5 V dc) when 20 staples are left.
• Sensor (self priming) in the stapler unit assembly
—
A photo-interrupter sensor that detects that staples are at the stapler unit assembly end; it also detects
failure in stapling
—
It turns low (0 V dc) (light blocking) when stapling is ready.
• Sensor (staple home) in the stapler unit assembly
—
A photo-interrupter sensor that detects the stapler unit assembly home position; it also detects failure in
stapling
—
This sensor also functions as a trigger to stop the staple motor.
—
It turns low (0 V dc) (light blocking) while the stapler unit assembly stays at the home position.
Sensor (staple home)
Sensor (self priming)
Stapler unit assembly
General information
7500-XXX
1-25