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
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CASE_SENS |
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VCC
R76 R75
10 0 10 0
JP16
4
3
2
R511
10 K
GND 4PIN
Fig. 3.12 Case sensor
Print Head Lift Lever Open Sensor
VCC
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HEAD_SENS |
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R73 | R74 |
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10 0 | 10 0 |
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R50 | 2 |
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1 |
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10 K | GND | 4PIN |
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| HEAD_OPEN | |
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.
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