Operating Principles
LQ-300
Service Manual
2.3.4 Home Position Sensor Circuit
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
comector
switch is open (OFF) when the carriage is in the home position and is closed (ON) when
the carriage is out of home position.
+5 v
CPU (ICI)
1
Home Position
Sensor
2
P551AN5
4
)
“
Figure 2-15. Home Position Sensor Circuit Diagram
2.3.5
Paper End 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)
E
P52JAN2
+5
v
t
PE Sensor
63
Figure 2-16. Paper End Sensor Circuit
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)
P53/AN3
1
Release Lever
Position Sensor
Figure 2-17. Release Lever Position Sensor Circuit Diagram
(..;
2-14
Rev.A
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