The Speaker Company TTP 248M service manual TTP-248M Bar Code Printer Print Head, Gnd

TTP-248M Bar Code Printer

Service Manual

3.9 Print Head

VDD

JP18 A

U8D

VDD

ROHM_ KF20 04_ GL41 A

VDD

BC3 3

0. 1u F

CLK

9

8

2

Vdd

4

U8C

Vdd

R44

R45

R46

R47

GND

74 HCT1 4

10 K

10 K

10 K

10 K

5

6

6

/LAT

CLK

74 LS14 CONNECT BY VDD

10

U8E

/LAT

U7A

DI1

74 HCT1 4

11

10

19

DI1

1

2

U8F

20

STB1

U7B

13

12

15

DO1

4 74 HCT1 4

DI2

U8A

74 HCT1 4

DI2

STB2

3

74 HCT1 4

16

U7C

1

2

13

DO2

6 74 HCT1 4

DI3

U8B

DI3

STB3

5

14

U7D

3

4

7

DO3

74 HCT1 4

DI4

74 HCT1 4

DI4

9

8

8

STB4

DO4

AVCC

74 HCT1 4

11

74 HCT1 4

TM

12

TM

TM

R107

STORBE1 18

STB1

22 K

STORBE2 17

STB2

STORBE3

9

STB3

STORBE4

5

STB4

1

L-GND

3

L-GND

R108

6. 2K

GND

JP18 B

Vdet

Vdet

1

VH

2

VH

Z1

R15

1K

3

VH

VMM

4

R48

P-GND

3. 3V

5

P-GND

10 K

6

P-GND

Q7

AGND

ANALOG GND

	R109
/RESET_ PH	8. 2	IRF4 905
		Q8
	R16
	1K
	Q6
	HSC945	IRF4 905
	R49
	10 K

C62C79

ANALOG GND AGND 22 00 uF

AGND

22 00 uF

Fig. 3.7 Print Head (ROHM KF2004-GL41B)

Print Head Sensor

The voltage of sender is about 1.18V (1.17V~1.19V)

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