Paper Timing Sensor (Pts) - Printronix L5535 Maintenance Manual

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Paper Timing Sensor (PTS)

This sensor is also a photo-interrupter. However, a lever is not used, because

the output signal of the photo-interrupter serves as the cut sheet leading-edge

detection signal, which affects printing quality.

The paper timing sensor consists of an LED light emitter and receptor on the

same side of the transport path. When paper passes through this area, the

paper reflects the light from the light emitter to the light receptor, causing the

printer to detect the leading edge of the paper.

(No Paper Present)

(Paper Present)

Light Emitter (LED)

Light Receptor

Light receptor