Detecting Punch Waste Box; Functions Of Punch Sensors/Motors - Lexmark C950 Service Manual

Detecting punch waste box

The sensor (punch waste box set) detects whether the punch waste box is properly set.
When the sensor (punch waste box set) does not detect that the punch waste box is properly set for four
seconds, the punch waste box count is reset.

Functions of punch sensors/motors

• Sensor (punch unit side registration 1)
A photo-reflective sensor that detects the side edge of large media.
–
Media side edge is detected by On/Off of this sensor while shifting the punch (containing this sensor) in
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the direction of media width.
The sensor remains at high (+5 V dc) while media is present, and turns low when media side edge is
–
detected.
• Sensor (punch unit side registration 2)
A photo-reflective sensor that detects the side edge of small media.
–
This sensor has the same function as the sensor (punch unit side registration 1).
–
• Sensor (punch carriage shift HP)
A photo-interrupter sensor that detects the home position of the moving punch.
–
– It turns high (+5 V dc) (light blocking) when the home position is detected.
• Sensor (punch unit HP)
A photo-interrupter sensor that detects the home position of the cam plate that lowers the punching pins.
–
It turns high (+5 V dc) when the home position is detected.
–
• Sensor (punch hole select)
– A photo-interrupter sensor that detects the rear position of the cam plate.
It turns high (+5 V dc) when the rear position is detected.
–
This sensor also detects the cam position to switch punch holes (2-hole/3-hole).
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• Sensor (punch cam front)
A photo-interrupter sensor that detects the front position of the cam plate.
–
– It turns high (+5 V dc) when the front position is detected.
This sensor is used to determine to which side (front or rear) the cam plate should be moved.
–
• Sensor (punch unit motor encoder)
A photo-interrupter sensor that detects pulse generated by the encoder attached to the punch unit motor.
–
– It counts punch unit motor revolutions and becomes a trigger to stop the motor (by shutting off the
current).
• Punch carriage shift motor assembly
A stepping motor to move the punch in the media width direction.
–
• Punch unit motor
A DC motor to move the cam plate that lowers the punching pins.
–
Forward rotation of the motor moves the cam plate to the front side, and reverse rotation moves it to the
–
rear side.
5058-030
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