TTP-248M Bar Code Printer
Service Manual
2.Selecting AUTO RIBBON to detect ribbon will get a value of tension, and then selecting the MANUAL Ribbon.
When sensor detects ribbon:
LCD displays Not Through the voltage of receiver (PIN 4)≦1.26V When sensor detects no ribbon:
LCD displays Through the voltage of receiver (PIN 4)≧2.10V.
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| VCC |
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| R77 |
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| 10 0 | JP22 |
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| 4 |
R_END |
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| U4D | R_SENS |
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REND_SENS | 8 | 9 |
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| 74 HC14 R 9 |
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| 10 K |
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GND
Fig. 3.14 Ribbon End Sensor Circuit
3.12 Serial Port Circuit
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| U32 |
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| VCC |
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| L1 4 INDUCTOR1 | 6 |
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| D- | Tx D |
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| R81 | 5 |
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| C17 |
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JP28 |
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1 |
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| V |
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2 | VDD |
| LTC4 90 |
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2PIN |
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JP3 |
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1 |
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2 |
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| TX |
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| 8 | T2 OUT | R2OUT | 10 |
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5 |
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| U31 |
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| SP32 32 E | 15 |
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DB9_ 1 | GND |
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GND
Fig. 3.15 Serial Port Circuit
U18 (SP3232E) is RS232 asynchronous communication driver IC.
U1/1 74 RxD2 /SCPT4
U1/1 68 Tx D2 /SCPT4
U1/1 76 CTS2 /IRQ5 /SCPT7
U1/1 70 RTS2 /SCPT6
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