Tally Dascom 7010, Maintenance Manual, Page: 47 / 255

2-2. Operation of Control Parts
2-31
(10) Peel sensor (7010R only)
The peel sensor is used to detect the peeled label at the exit of the printer.
This sensor is a reflective sensor.
When a peeled label exists at the exit of the printer, the light emitted from the LED of the peel
senor is reflected by the label and reaches the phototransistor. Thus, the voltage at pin 12
(PEELSENS) of U1 (CPU) becomes “High”. The CPU senses the voltage at pin 12 to detect
the presence of label at the exit.
When no label exists at the exit of the printer, the light emitted from the LED does not reach
the phototransistor. Thus, the voltage at pin 12 (PEELSENS) of U1 (CPU) becomes “Low”.
CRPTYP1 signal (pin 96 (PM1) of U14 (Custom IC)) is used to detect whether the SA, Peel
Sensor is installed in the 7010R or not.
[Main PCB]
U1 CPU
AN17
Peeled label
SA, Peel Sensor
3
5
4
2
[Peel Sensor]
J503
7
6
1
2
J502
+5.0V
[Rewinder PCB] R167
R169
D9
+3.3V
R168
12
PEELSENS
U14
Custom IC
PM1
CRPTYP1
96
7
6
1
2
J16
+3.3V
R16