Paper Timing Sensor (Pts) - Printronix L5035 Maintenance Manual

Control Principles

Paper Timing Sensor (PTS)

This sensor is also a photo-interrupter. However, because the output signal is
used as the cut sheet leading-edge detection signal and affects printing
quality, the mechanical aspects (lever) have been eliminated.
The paper timing sensor consists of an LED light emitter and receptor on
either side of the transport path. When paper passes through this location,
light between the light emitter and receptor is blocked, causing detection of
the leading edge of the paper.
(no paper exists) (paper exists)
Light emitter (LED)
Light receptor
Light receptor Paper
Paper
Light
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