Epson LQ-2550 Technical Manual page 118

REV.-A
2.3.4.10 RL/LD Sensor Circuit
Figure 2-69 shows the RIJLD sensor circuit. This circuit uses the AN6 and AN7 terminals of the sub --
CPU as signal inputs.
*
SUB CPU
( 7 B ) AN7
AV
SS
Table 2-46 shows the relationship between the printer mechanism status
ports AN6 and AN7.
Voltage of the
Sub CPU
H
L
I
*1: When the terminal voltage at PC7 is "H," the actual voltage level is between 3.68 and 1.4 ~]
depending on the value of VR1 (AN6).
NOTE: The "X" mark means unstable.
Figure 2-69. RL/LD Sensor Circuit
Table 2-46. RL/LD Sensor Circuit Signal Status
Release Lever Loading Lever
Position
x
Friction
Tractor
—
—
V
A R E F
RI 02
R106
RM 1-5
3 4
Terminal Voltage
Position
Level 1
x
—
—
Open
Closed
2 - 7 2
RL Sensor
CN20
D12
n
Y
6
5
and signals at the sub
Terminal Voltage
Level
H H
—
H
—
L
—
L
—
H
CPU