Sensor Circuits - Epson LQ-1050 Technical Manual

2.3.8.4 Sensor Circuits

This control circuit employs two sensor circuit. One is the paper end sensor circuit which detects the
paper stays or not in printer mechanism. The other is the release/friction sensor circuit which detects
the paper release lever position.
Paper End (PE) Sensor
Detection System:
Signal Status:
Circuit:
Detectable Position:
'99. 5
NOTE:
When narrow paper is used, set the paper so that neither the holes for paper feeding nor the
holes for filing go into the detectable area (portion shown by the oblique lines in the above
figure).
Mechanical switch
See Table 2-25.
Table 2-25. PE Sensor Signal Status
Paper
Presence
Absence
See Figure 2-67.
Fig. 2-67. PE Sensor Circuit
See Figure 2-68.
o
0
0
0
I
83.6
m m
m m
288 mm (Frame Width. LQ - 850)
463 mm (LO - 1050)
Fig. 2-68. Paper Detectable Position
PA1 (2 pin) of CPU (76)
High
Low
+5
A
W X Y Z
2-65
CPU
0
0
0
o