Control Principles; Upper Level / Lower Level Paper Size Sensor - Printronix L5535 Maintenance Manual

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Control Principles

This section describes the sensors and switches in the cut sheet feeder.

Each sensor, the upper sensor and the lower sensor, consists of a PCBA with

three switches mounted on it. There are seven paper sizes (including no

cassette installed). The feeder determines the paper size by detecting which

of the three switches are on and which are off. Plastic inserts on the end of

the cassette actuate these switches.

detection sensor

Cassette Sensor PCBAs