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TTP-248M Bar Code Printer
Service Manual
Fig. 3.11 Peel-off Sensor Circuit
Case Sensor
The voltage of sender is about 1.18V (1.17V~1.19V)
When sensor detects upper cover, the voltage of receiver (PIN 2) is≧2.10V
When sensor does not detect upper cover, the voltage of receiver is ≦1.26V
GND
VCC
1
2
3
4
JP16
4PIN
R75
100
R51
10K
56
U4C
74HC14
R76
100
CASE_SENS
Fig. 3.12 Case sensor
Print Head Lift Lever Open Sensor
GND
HEAD_OPEN
VCC
1
2
3
4
JP15
4PIN
R73
100
R50
10K
34
U4B
74HC14
R74
100
HEAD_SENS
Fig. 3.13 Print Head Lift Lever Open Sensor Circuit
Ribbon End Sensor
1. Selecting MANUAL RIBBON 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 000~015, it will alter between
1.57V~2.70V.