Epson LQ-2550 Technical Manual page 117

2.3.4.9 PE Sensor Circuit
Figure 2-68 shows the PE sensor circuit. This circuit determines whether paper exists in the printer or
not.
Table 2-45 shows the relationship between the paper state and the voltage at the PB7 terminal of the
sub CPU.
I
Loading (Paper exists)
+5
A
CN5
1
Figure 2-68. PE Sensor Circuit
Table 2-45. Paper State and PB7 Voltage
Paper State
Ejecting (Paper out)
R5
/
R30
I
1
o
2-71
(7 B)
5
I
REV.-A