The Speaker Company TTP 248M 10 Black mark/ Gap Sensor Circuit Peel-off Sensor, Bm E, Gape

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

							VCC
							R66		1
							10 0		2
						R27			3
				U3E
U1/1 2			10		11	4. 7K			4
								BM_ E	5
GAP_SENSER					74 HC14	R26		GAP_E	6
						10 K			7
		8 U3D
U1/1 0				9		GND
									VDD
EM SEN		U5B	74 HC14
	5					GND	Q14
U1/2 07
				7			HSC945
DA0 /AN7/PTL7	6
		LM3 24
		VDD					R65
							10 0
		4
			U5A
	3						GND	Q15
				1				HSC945
	2
			LM3 24
		11		U5C				R63
			10			R126		10 0
U1/2 06		GND			8		MOTER_C
			9			10 0
MOTER E
				LM3 24				GND

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

74 HC14

R43 R72

10 K 10 0

JP32

5

4

3

2

1

GND 5PIN

31