BIXOLON IMPACT PRINTER SRP-270 - Manual (Page 56)

Rev. 3.02 - 56 -
SRP-270
8-1-10-4 Home Position Detection Mechanism
The home position detection mechanism consists of the detection protrusion at the left side of the carriage
sub assembly and the sensor sub assembly at the left side of the base frame. It determines the home
position, identifies the carriage position, and detects carriage sub assembly operation errors.
The sensor sub assembly consists of an LED and photo transistor. When the carriage sub assembly moves,
the detection protrusion passes between the LED and photo transistor and blocks the optical axis of the
photo transistor, changing the output level of the photo transistor.