TTP-248M Bar Code Printer
Service Manual
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 white paper:
LCD displays Reflect the voltage of receiver (PIN 3)≦2.10V When sensor detects the Black mark or does not detect paper:
LCD displays Not Reflected the voltage of receiver (PIN 3)≧1.26V
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| VCC |
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| R66 |
| 1 |
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| 10 0 |
| 2 |
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| R27 |
| 3 | |
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| U3E |
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U1/1 2 |
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| 10 | 11 | 4. 7K |
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| 4 | |
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| BM_ E | 5 | |
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GAP_SENSER |
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| 74 HC14 | R26 |
| GAP_E | 6 |
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| 10 K |
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| 8 U3D |
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U1/1 0 |
| 9 |
| GND |
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| VDD | |
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EM SEN |
| U5B | 74 HC14 |
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| 5 |
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| GND | Q14 |
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U1/2 07 |
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| 7 |
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| HSC945 |
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DA0 /AN7/PTL7 | 6 |
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| LM3 24 |
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| VDD |
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| R65 |
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| 10 0 |
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| 4 |
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| U5A |
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| 3 |
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| GND | Q15 |
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| 1 |
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| HSC945 | |
| 2 |
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| LM3 24 |
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| 11 |
| U5C |
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| R63 |
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| 10 |
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| R126 |
| 10 0 |
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U1/2 06 |
| GND |
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| 8 | MOTER_C |
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| 10 0 |
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MOTER E |
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| LM3 24 |
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| GND |
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JP12
GAP_E&BM_ SEN
Fig. 3.10 Black mark/ Gap Sensor Circuit
Peel-off Sensor
The voltage of the sender is about 1.18V (1.17V~1.19V)
When sensor does not detect paper, the voltage of receiver (PIN 2) is≧2.10V When sensor detects the paper, the voltage of receiver (PIN 2) is≦1.26V
VCC
CASE_OPEN
U4A
PEEL_SENS | 2 | 1 |
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74 HC14
R43 R72
10 K 10 0
JP32
5
4
3
2
1
GND 5PIN
31
