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3.11 Home Position Detector (HP-sig) Specifications
The home position detector is composed of the mechanical switch. While the carriage is located
at the left end, the switch remains ON.
RI
10KQ
I
+5V
AT
I
RI
I
CPU,
161
-..
~L,
etc.
R2
I
—cl
I
z
I
"2
I p~i"te~
User'sside I Mechanismside
Fig.
3-20 Home position detector circuit (example)
In order to improve the reliability, we recommend that the HP-sig is detected as described below.
(1) When the T1-sig is unstable when turning on the power, etc.
Detect the L level after having detected the H level of the HP-sig, and then, after having carried
out 92 pulse counts for the T1-sig, detect the H level.
(2) When the T1-sig is decided during continuous operation of the motor
Detect the L level of the HP-sig, and then, after having counted 1066 pulses of the T1-sig, detect
the H level.
3.12 Paper-out Detector (PE-sig) Specifications
The Paper-out Detector is composed of the mechanical switch. While the paper is set in the paper
tray, the switch remains ON.
R1
10KQ
I
+5V
$:
T
RI
18 I
-..
R2
I
I
-rc'
I
0'2
Z&l
I
printer
User'sside I Mechanismside
Fig. 3-21 Paper-out detector circuit (example)
-22-
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