The Speaker Company TTP 248M Circuit Description, 3.1 MCU, 1 MCU Circuit Diagram, C 1+, C 2+

TTP-248M Bar Code Printer Service Manual

3. CIRCUIT DESCRIPTION

3.1 MCU

L1 2

U 32

IN DU C TO R1 R 80

V CC

L1 3

12 0

8

R +

V CC

1

V CC

7

R -

R xD

2

V CC C 12

A 0

L1 4

IN DU C TO R1

PR 14

A 1

6

D -

Tx D

3

16

A 2

IN DU C TO R1

0. 1uG ND

A 3

R 81

5

D +

G ND

4

C 17

12 0

0. 1u

10 K

A 4

J P28

2

V +

CCV

C 1+

1

A 6

2

V DD

L1 5

LTC4 90

6

C 10

PR 15

A 5

1

G ND

V -

0. 1u

A 7

IN DU C TO R1

C 1-

3

2PIN

C 11

10 K

A 8

C 2+

4

0. 1u

PR 16

A 9

F1

C 9

A 10

J P3

1A

G ND

5

0. 1u

A 11

C 2-

PR 17

10 K

A 12

1

A 13

6

TX

L7

14

A 14

2

L8

T1 OU T

12

A 15

7

R X

B EA D 300

13

R 1IN

R 1O UT

10 K

A 16

3

L1 0

B EA D 300

T1 IN

11

PR 18

A 17

8

R DY

7

GND

9

A 18

4

D SR L9

B EA D 300

8

T2 OU T

R 2O UT

10

R 2IN

T2 IN

A 19

9

B EA D 300

10 K

A 20

5

U 31

PR 19

A 21

G ND

SP32 32 E

15

A 22

D B9 _1

A 23

10 K

A 24

G ND

10 K

R 31

A 25

10 K

R 32

M EM O RY .SCH

M EM O RY

17 4

D [0.. 31 ]

A [0.. 25 ]

16 8

/R ESET

/R ESET

17 6

C LK

C LK

17 0

C S0

C S0

C S2

C S2

C KE

15 7

C S3

C S3

/W E

15 8

/R D

16 6

/W E0 /D QM LL

D QM LU

17 2

16 7

SC K

/C AS

SC K

/R AS3L

SD I

SD I

SD R AM

SD O

SD O

R OM 1

R OM 1

P2 1

16 9

C SI

C SI

R OM 2

R OM 3

P2 2

17 1

D QM U L

D QM U L

R OM 4

TX D

16 4

V DD

D QM U U

D QM U U

16 5

T

V CC

J P10

V DD

C 39V DD

ESE

O

19 6

1

2

G ND

PR 21

V DD

/R

T C

19 5

3

4

10 K

R

5

6

LC D _D 0

R 36 R 35 R 34 G ND1u

R 82 R 33 R 29

3

G ND

LC D _D 1

7

8

LC D _D 2

10 K 10 K

10 K

4. 7K 10 K

10 K

PR 20

39 24

22

21

20

14

3

38 32

C KE

10 5

LC D _D 3

9

10

LC D _D 4

10 K

/W E

93

LC D _D 5

11

12

LC D _D 6

SRG

CKG3

CKG2

/R D

88

LC D _C S2

15

16

LC D _/R ES

LC D _D 1

12 1

35

D 0

D QM LU

90

LC D _D 7

13

14

LC D _C S1

LC D _D 0

12 0

D QM LL

89

LC D _R /W

17

18

LC D _D /I

LC D _D 2

12 4

34

D 1

D QM U L 91

LC D _E

19

20

B AC K LIG HT

LC D _D 3

12 5

33

D 2

D QM U U 92

LED1

21

22

LED2

LC D _D 4

12 6

31

D 3

/C AS

10 8

LED3

23

24

K EY 1

LC D _D 5

12 8

28

D 4

/R AS3L 10 6

K EY 2

25

26

K EY 3

LC D _D 6

12 9

27

D 5

B K

10 7

R

27

28

Y

LC D _D 7

13 0

26

D 6

29

30

LC D _C S1

13 1

25

D 7

V M M

LC D _C S2

13 2

R 137

L2 4

PA N L

G CK 1

30

C LK

16 2

LC D _W /R 13 3

64

10 0

B EA D 080 5 N B 22 0

C S0

96

LC D _D /I

13 4

66

C S2

98

LC D _E

13 5

68

C S3

99

B K_ IO

V DD

69

PE_I

B K_ IO .SC H

Q 3

70

SELECT_I

B _IN 1

V DD

10 2

B _IN 1

R 37

B _IN 2

B _IN 2

H SC 94 5

V DD

H SC 94 5

79

1K

B _IN 3

B _IN 3

Q 5

Q 4

R 38

A D1

A D1

41 1KR 68

43

A 0

53

A D2

A D2

R 39

10 K

2SC2

LC D _B L

13 6

44

A 1

54

10 K

B _O UT1

R 69

R ED

G ND

10 0

PE

13 7

45

A 2

55

56

B _O UT1

R 70

B _O UT2

B _O UT2

10 0

SELECT

13 8

48

A 20

A 4

58

V DD

V DDA GN D

10 0

A GN D

Y ELLO W

ER R OR

13 9

49

A 21

A 5

60

61

B _O UT1

14 0

50

A 22

A 6

PR 8 10 K

PR 7 10 K PR 6 10 K

PR 5

PC 1

22 0p PC 2 22 0p PC 3 22 0p PC 4 22 0p

B _O UT2

14 2

51

A 23

A 7

62

52

A 24

V CC

J P1

A 8

63

R 17

C 5

1

64

10 K

J P4

38

22 0p

2

A 10

65

37

10 K

10 0

U 6A

74 HC T14

/W rite

TC K

67

G ND

3

A 11

66

19

1

/W rite

PR 22

1

2

98

TD O

12 2

4

A 12

67

20

2

D 0

D 0

10 0

TD I

63

5

A 13

68

21

3

D 1

D 1

10 1

TM S

65

6

A 14

70

22

4

D 2

D 2

10 2

V CC IN T

14 1

A 15

72

23

5

D 3

PR 23

10 0

D 3

10 3

V CC IN T

84

V CC

J TAG

A 16

73

24

6

D 4

D 4

10 4

V CC IN T

42

A 17

74

25

7

D 5

D 5

10 5

V CC IN T

8

A 18

75

26

8

D 6

D 6

10 6

V CC IO

12 7

A 19

76

10 0

27

9

D 7

PR 24

U 6F

D 7

10 7

V CC IO

10 9

A 20

77

28

10

In tr

12

13

In tr

11 0

V CC IO

73

A 21

78

29

11

/W ait

74 HC T14

/W ait

11 1

V CC IO

55

A 22

80

30

12

PE

10

11

V CC IO

37

A 23

82

10 0

31

13

SELECT

PR 25

U 6E

74 HC T14

V CC IO

1

A 24

84

32

14

/D Strb

/D Strb

11 2

V CC

A 25

86

33

15

/A Strb

/A Strb

11 3

59

In tr

_I

13 9

34

16

ER R OR

58

R 95

/D Strb_ I

13 3

35

17

/In it

R 56

10 0

/In it

11 5

57

/A Strb_ I

13 1

36

18

4

3

PE

56

10 K

/In it_ I

13 0

R 19

V DD

R 18

6 U 6C

U 6B5

74 HC T14

54

J P27

PE_I

12 0

10 K

SELECT

2

SELECT_I

11 9

C EN TR ON IC

10 K

V DD

U 6D

74 HC T14

G TS3

2

B K

1

V CC

ER R OR _I

11 8

PR 1 10 K PR 2 10 K PR 3 10 K PR 4 10 K

8

9

ER R OR

4

V CC

G ND D IGITA L G N D

G ND

2PIN

R 41

74 HC T14

G TS1

5

D I1

17

G TS2

6

B UZZER_ O18 7

D I2

16

7

PR 12

U 4E

10 K

B UZZER

18 8

15

19

TX D

10 K

D I3

14

PH _I

10

11

D I4

/R ESET_PH

PH _I

96

74 HC 1 4

18 5

V CC 3

/LAT

/LAT_P

95

STB1 _I

18 0

B C2

STB1

13

94

STB2 _I

17 9

B C3

B C4

B C5

B C6

B C7

B C8

B C9

B C1 0

STB2

12

93

STB3 _I

17 8

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

V det

V det

STB3

11

92

STB4 _I

17 7

TM

TM

STB4

10

/LAT_P

18 6

C LK

9

M OTO R

60

R A

R A

94

V CC

PR IN T. SC H

M OTO R.SCH

61

R B

R B

11 6

PR IN TH EA D

88

10 4

EN _M B

B C1 6

87

11 7

M B

10 3

B C1 7

B C1 8

B C1 9

B C2 0

B C2 1

B C2 2

B C2 3

B C2 4

B C2 5

86

11 8

U 3F

M E

11 7

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

85

V CC

IN A_ R

83

11 9

12

13

/IN A _R

82

R 67

R 64

10 0

IN B _ R

81

40

B UZZER

74 HC 1 4

10 0

V CC

B

/IN B _R

80

41

J P2

y

97

B 1

4

A VC C

p

EN _M A

76

75

3

L2

B C2 6

B C2 7

B C2 8

C 26

B C1 1

B C1 2

B C1 3

B C1 4

B C1 5

B C2 9

a

EN _C U TTER

74

GND GND GND GND GND GND GND GND GND GND GND GND GND

77

2

0

s

/B K

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

0. 1uF

s

PH A SE

91

78

R 25

1

C

M OTER _C

M OTER _C

10 K

a

C TSEN S

C TSEN S

B UZZER

G ND

R NE_END

p

V CC

PEEL_SEN S

144

123 114

108

99

90

72

62

47

36

29

18

R 24 R 23

c

1. 5K 1. 5K

a

PEEL_SEN S

i

PR 9

PR 11

V DD

B C3 0

B C3 1

B C3 2

t

V DD

o

0. 1uF

0. 1uF

0. 1uF

r

l

10 K

PR 10

10 K

10 K

i

A VC CL5

V CC

L4

V CC

s

t

0

0

V M M

J P11

A VSS

G ND

2

R 40

AVSS

DIGITAL GND

10 K

U 4F

R 71

Q 1

B UZZER

B UZZER_ O

13

12

H SC 94 5

10 0

74 HC 1 4

1

2

J P5

2PIN

D [0.. 31 ]

R TC _O

V CC L

V CC

L3

L1

L3 0

L3 1

0

0

0

C 19

G ND

C 18

15 pF

0

22 pF

22 pF

15 pF

G ND

X 2

C 1

C 2

21

32 .76 8k Hz

CC

C 4

C 3

16 M Hz

V

X 1

47 0p

47 0p

17 5

15 4 13 4

81 29

15314 05

18 3 16 3 11 1

97 85 71 59 47 35 1921 4

14 6

14 7

14 8

14 9

5

154 9

15 6

15 5

V CC

U 1

RTC

2

14 4

Vcc

CA

-ssVCPLAPL1

AP2

M D1

2

SENSO R

ccV PLVLcc1

AL

M D2

R xDVcc

2/SCPT4-- PLVLcc2-

ccQV ccQV ccQV ccQV ccQV ccQV ccQV ccQV ccQV ccQV

-ssVPLL2

C

K/PTCLH7 TXAL2

XTEAL

XTAL

52

D 0

G ND

H EA D_ SENS

V V

XTE

M D0

1

cc

SENSO R.SCH

Tx D2 /SCPT4Vcc cc

C TS2 /IR Q 5/SCPT7

T

D 0

51

D 1

C ASE_ SEN S

H EA D_ SENS

R TS2 /SCPT6

D 1

50

D 2

R _EN D

C ASE_ SEN S

D 2

49

D 3

R EN D_ SENS

R _EN D

STATU S0/PTJ 6

D 3

48

D 4

R EN D_ SENS

STATU S1/PTJ 7

D 4

D 5

46

D 5

Tx D1 /SCPT2

D 6

44

D 6

R xD 1/SCPT2

D 7

43

D 7

42

D 8

SC K 1/SCPT3

D 8

41

D 9

D 9

40

D 10

D 10

39

D 11

SC K 2/SCPT5

D 11

38

D 12

D 12

R xD 0/SCPT0

D 13

37

D 13

Tx D0 /SCPT0

D 14

36

D 14

SC K 0/SCPT1

D 15

34

D 15

32

D 16

U 9E

PTA0 /D 16

U

M D4

PTA1 /D 17

31

D 17

9

11

10

M D3

PTA2 /D 18

30

D 18

-

28

D 19

-

74 LS05

PTA3 /D 19

26

D 20

>

PTA4 /D 20

V

U 9F

C KE/PTK5

PTA5 /D 21

25

D 21

24

D 22

PO W ER

po we r.s ch

13

12

/W R /R D

PTA6 /D 22

23

D 23

/R D

PTA7 /D 23

22

D 24

P_ IN T

/W E0 /D QM LL

PTB0 /D 24

20

D 25

74 LS05

/W E1 /D QM LU//W E

PTB1 /D 25

18

D 26

/W E2 /D QM U L//IC IOR D /PTK6

PTB2 /D 26

/W E3 /D QM U U //IC IO W R/PTK 7

PTB3 /D 27

17

D 27

V CC

/C ASLL/C AS/PTJ 2

PTB4 /D 28

16

D 28

/R AS3L/PTJ 0

PTB5 /D 29

15

D 29

14

D 30

R 22

R 21

R 20

PTB6 /D 30

13

D 31

10 K

10 K

10 K

/R AS2L/PTJ 1

PTB7 /D 31

LED3

/IR LS0/PTF0/PIN T8

14 3

LED2

C KIO

LED1

R 138 10 0

K EY 3

/C S0 /M CS0

SH 77 09 A

R 139

10 0

K EY 2

/C S2 /PTK0

U 3A

R 59

/C S3 /PTK1

/C ASH H/PTJ 5

11 3

1

2

K EY 1

82 0

10 0

/C ASH L/PTJ 4

11 2 74 HC 1 4

3

U 3B 4

R 58

C 82

C 83

R 140

/C S6 //C E1 B

74 HC 1 4

U 3C

10 0

R 57

0. 1u

C 84

/C ASU /CA SLH /PTJ 3

11 0

5

6

0. 1u

0. 1u

14 0

74 HC 1 4

10 0

G ND

A 0

PTF3 /PINT11

A 1

/IR LS2/PTF2/PIN T1 0

14 1

U 9B

14 2

A 2

/IR LS1/PTF1/PIN T9

3

4

R 84

A 3

19 0

R _EN D 0

U 9C

3. 3K

A 4

D RA K 1/PTD 0

5

6

R _EN D

A 5

D RA K 0/PTD 1

18 9 R _EN D 1

74 LS05

R 85

A 6

R ESTO UT/PTD2

18 4

R _EN D 2

U 9D

1. 8K

A 7

W AK EUP/PTD3

18 2

R _EN D 3

74 LS05

R 86

A 8

/D REQ 0/PTD 4

19 1

R EN D_ SENS

9

8

91 0

A 9

/D AC K 0/PTD 5

11 4

R ED

U 9A

R 87

19 2

43 0

A 10

/D REQ 1/PTD 6

11 5

Y ELLO W

74 LS05

1

2

A 11

/D AC K 1/PTD 7

A 12

13 8

B _IN 1

V CC

A 13

TR ST/PTF5 /PINT13

74 LS05

A 14

TR ST/PTF6 /PINT14

13 7

B _IN 2

R 66

J P12

A 15

PTF7 /PINT15

13 6

B _IN 3

1

A 16

10 0

2

R 27

3

A 17

PTG4

12 9

10

U 3E

11

4. 7K

4

A 18

12 8

B M _ E

5

A 19

/A SEBR K AK /PTG 5

12 7

R 26

G AP_E

6

A 20

/A SM D O/PTG 6

12 6

74 HC 1 4

10 K

7

A 21

IO IS1 6/PTG 7

U 3D

8

9

G ND

A 22

V DD

G AP_E&B M _SEN

A 23

A 24

PTH6

15 1

U 5B

74 HC 1 4

12 5 PEEL_SEN S

5

G ND

Q 14

A 25

A DTRG /PTH 5

12

G AP_SEN SER

7

H SC 94 5

TR ST/PTF4 /PINT12

IR Q4 /PTH 4

11

C TSEN S

6

PTG1 /A UTAD A 1

/IR L3 /IR Q 3/PTH 3

10

B M _ SEN

PTG2 /A UTAD A 2

/IR L2 /IR Q 2/PTH 2

PTG3 /A UTAD A 3

/IR L1 /IR Q 1/PTH 1

9

H EA D_ SENS

LM 3 24

TD O /PTE0

/IR LO /IRQ 0/PTH 0

8

C ASE_ SEN S

/C AS2U /PTE1

V DD

R 65

10 0

/R AS3U /PTE2

10 0

C SI

/C S4 /PTK2

10 1

SC K

4

/C S5 //C E1 A/PTK 3

87

SD I

U 5A

/M C S1 /PIN T1 /PTC 1

/B S/PTK 4

13 5

SD O

3

G ND

Q 15

/M C S0 /PIN T0 /PTC 0

PTG0 /A UTAD A 0

1

H SC 94 5

2

/M C S3 /PIN T3 /PTC 3

A N2 /PTL2

20 1

A D2

20 0

A D1

LM 3 24

/M C S4 /PIN T4 /PTC 4

A N1 /PTL1

/M C S5 /PIN T5 /PTC 5

A N0 /PTL0

19 9

11

U 5C

R 63

/M C S6 /PIN T6 /PTC 6

20 7

10

10 0

/M C S7 /PIN T7 /PTC 7

D A0 /A N7 /PTL7

R 126

/M C S2 /PIN T2 /PTC 2

D A1 /A N6 /PTL6

20 6

M OTER _E

G ND

8

M OTER _C

9

10 0

PTE7

LM 3 24

G ND

/C AS2L/PTE6

20 2

TH _SEN S

/C E2 B/PTE5

M

A N3 /PTL3

20 3

/C E2 A/PTE4

C

P

T

A N4 /PTL4

20 4

C 23

C 24

sVsA

cVcA

sVsA

QssV QssV QssV QssV QssV QssV

QssV QssV QssV QssV

ssV ssV ssV ssV ssV sV V

SEE/RT D5M

SEE/RT

OUQ/IR

N /W

QRE/B

KAC/B

/C AS2H /PTE3

RT-

IIT

A N5 /PTL5

C 25

s ss

MA

0. 1uF

R 60

0. 1uF

R 61

0. 1uF R 62

SH -7 70 9A

10 0

10 0

10 0

19 8

20 5

20 8

9

18 1

13792 15 2

15 3

17 3

6

12 4

19 3

16 0

7

12 2

12 1

D 2

D 3

A VC C

D 5

D 4

A VC C

D 7

D 6

A VC C

19 33 45

57 69 83 95 10 161

27

197

123

V CC

T

1N 41 48

R1N12 41 48

1N 41 48

R 1N13 41 48

1N 41 48

R1N14 41 48

B C1

C 20

ESE

1K

1K

1K

V CC

V CC

A VSS

A VSS

/R

R 11

R 10

10 uF

0. 01u F

TM

V det

1K

10 K

V CC L

R 130

A VSS

V CC

U 10

10 K

A VSS

3

V CC 3

R 3

V DD

/R ST

1

3. 0K

4

V CC 5

G ND

2

5

V CC A

V CC

V CC

G ND

R 2

C 77

LTC1 72 8

3. 4K

C 78

R 28

R 30

0. 1uF

0. 1uF

10 K

10 K

SW 1

J P9

G ND

G ND

1

G ND

SW -PB

2

N M I

TTP-2410_MAIN

G ND

G ND

Fig. 3.1 MCU Circuit Diagram

The mainboard of TTP-248M/2410M includes seven system blocks:

A.Memory System (decoder & memory block)

B.Motor System (stepping motor, DC motor and cutter block)

C.Print Head System

D.Communication System (serial & parallel port block)

E.Power System

F.Sensor System

G.LCD Display System

10