The Speaker Company TTP 248M Benutzerhandbuch
30
TTP-248M Bar Code Printer
Service Manua
Service Manua
l
3.11 Sensor Circuits
Ribbon Near End Sensor
The voltage of sender (PIN 3) is about 1.18V (1.17V~1.19V).
When the sensor detects the black area, the voltage of receiver (PIN 2) is≧
2.10V.
When the sensor detects the white area, the voltage of the receiver (PIN 2) is≦
1.26V.
1
2
3
4
JP2
RNE_ END
VCC
GND
R64
10 0
10 0
R25
10 K
12
13
U3F
74 HC14
R67
10 0
10 0
U2/1 19
Fig. 3.9 Ribbon Near End Sensor Circuit
GAP Sensor
1. Selecting MANUAL GAP and adjust the tension.
When the tension increases, the voltage of the sender (PIN 5) will decrease;
when the tension decreases, it will increase.
If adjust the voltage of PIN 5 between tension 000~255, it will alter between
4.4V~3.7V.
2. Selecting AUTO GAP to detect label will get a value of tension, and then
selecting the MANUAL GAP.
When sensor detects the paper:
LCD displays Not Through the voltage of receiver (PIN 2)≦2.10V
When sensor detects the gap or does not detect paper:
LCD displays Through the voltage of receiver (PIN 2)≧1.26V
Black Mark Sensor
Selecting MANUAL Bline, and adjust the tension.
When the tension increases, the voltage of the sender (PIN 6) will decrease;
when the tension decreases, it will increase.
If adjusting the voltage of PIN 6 between tension 000~255, it will alter