Paper Transport System Monitoring - Printronix L5535 Maintenance Manual

Chapter 8
Control System Descriptions

Paper Transport System Monitoring

The paper transport system is monitored by the following sensors. (For the
paper size sensors and cassette paper sensor, see "Paper Detection" on
page II–124.)
Cut sheet transfer sensor (CWD)
Cutter
All the above sensors consist of a light emitter and receptor. The state of the
sensor is determined by whether the receptor detects the light from the
emitter. The light is blocked from the receptor either directly by the paper via
the paper near-end sensor, or indirectly via a rotating claw that is pushed by
the movement or presence of paper. The majority of all paper sensors use the
indirect rotating claw type of detection.
NOTE: False sensor readings can occur due to contamination of the emitter
II–142
or receptor with toner or paper dust.