Home Position Sensor Circuit; Paper End Sensorcircuit; Release Lever Position Sensor Circuit - Epson LQ-300 Service Manual

Operating Principles

Home Position Sensor Circuit

2.3.4
This printer has a connector switch to sense the carriage home position. The CPU receives a signal
from the HP sensor and recognizes the carriage home position when the printer is turned on. The
the carriage is out of home position.
CPU (ICI)
Figure 2-15.
Paper End
2.3.5 Sensor Circuit
This printer has a comector switch for sensing the paper end. The CPU receives a signal from the
connector switch and reco~es a paper end. The connector switch is closed (ON) when there is
no paper on the platen and is open (OFF) when paper is present.
CPU (ICI)
P52JAN2

2.3.6 Release Lever Position Sensor Circuit

This printer has a connector switch to detect the type of paper handling. The CPU receives a signal
from the connector switch to indicate whether the paper is fed using friction or hactor feed. The
connector switch is closed (OFF) when friction feed is selected and is open (ON) when tractor feed
is selected.
CPU (lCl)
Figure 2-17. Release
2-14
v
+5
2
Home Position
v
+5
t
63
Figure 2-16. Paper End Sensor Circuit
Lever Position Sensor Circuit Diagram
Home Position
Sensor
Sensor Circuit Diagram
PE Sensor
Release Lever
Position Sensor