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TTP-248M Bar Code Printer
Service Manual
3. CIRCUIT DESCRIPTION
3.1 MCU
VC C
X1
16M Hz
C1
15pF
C2
15pF
GN D
C3
470p
C4
470p
B
y
p
a
s
s
C
a
p
a
c
i
t
o
r
l
i
s
t
(
0
.
1
u
F
)
GN D
VC C
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
VC C L
L1
0
L2
0
L3
0
EN_M B
INB_ R
INA_ R
EN_M A
EN_C UTTER
PHA SE
/B K
C TSEN S
/INB _R
/INA _R
M OTER_C
PEEL_S EN S
M OTO R
M OTO R.SCH
EN_M B
INB_ R
INA_ R
EN_M A
EN_C UTTER
PHA SE
/B K
C TSEN S
/INB _R
/INA _R
M OTER_C
PEEL_S EN S
KEY 1
KEY 2
KEY 3
B1
B UZZER
R 10
10K
R 11
1K
TH_SENS
HEA D_SENS
C ASE_SENS
PEEL_S EN S
R EN D_SENS
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
VD D
R 17
10K
LCD _D0
LCD _D1
LCD _D2
LCD _D3
LCD _D4
LCD _D5
LCD _D6
LCD _D7
LCD _C S2
LCD _C S1
LCD _W /R
GN D
GN DD IGITA L GND
SELEC T
PE
ERR OR
/Wa it
/DStrb
/Init
/AStrb
VD D R 18
10K
R 56
100
C5
220p
VD D
VD D
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
D0
D1
D2
D3
D4
D5
D6
D7
A20
A21
A22
A23
VC C
/Wa it
/DStrb
D0
D1
D2
D3
D4
D5
D6
D7
/Write
Intr
/Init
/AStrb
D[0.. 31] A[0..25 ]
C KE
C LK
/R AS3L
/C AS
/WE
/WE0 /DQM LL
DQ M LU
SDR AM
R OM 1
R OM 2
/R ESET
/R D
R OM 3
R OM 4
C S0
C S2
C S3
SCK
SDI
SDO
C SI
DQ M UL
DQ M UU
M EMO RY
M EMO RY .SCH
D[0.. 31] A[0..25 ]
C KE
C LK
/R AS3L
/C AS
/WE
/WE0 /DQM LL
DQ M LU
SDR AM
R OM 1
R OM 2
/R ESET
/R D
R OM 3
R OM 4
C S0
C S2
C S3
SCK
SDI
SDO
C SI
DQ M UL
DQ M UU
/R ESET
C LK
C TSEN S
LED1
LED2
LED3
/DStrb_ I
Intr_I
/Init_I
/AStrb_ I
1
2
3
4
5
6
JP 1
JTAG
GN D
VC C
DI3
DI1
DI2
DI4
C LK
/LAT
TM
STB1
STB2
STB3
STB4
Vde t
/R ESET_PH
PRIN TH EAD
PRIN T. SCH
DI3
DI1
DI2
DI4
C LK
/LAT
TM
STB1
STB2
STB3
STB4
Vde t
/R ESET_PH
PH_I
/R ESE T
C LK
STB1 _I
STB2 _I
STB3 _I
STB4 _I
VC C
GN D
C 1+
1
V+
2
C 1-
3
C 2+
4
C 2-
5
V-
6
T2OU T
7
R 2IN
8
R 2OUT
9
T2IN
10
T1IN
11
R 1OUT
12
R 1IN
13
T1OU T
14
VC C
16
GN D
15
U31
SP3232 E
C9
0.1u
C 10
0.1u
VC C
C 11
0.1u
C 17
0.1u
GN D
GN D
L7
B EA D 300
L8
B EA D 300
L9
B EA D 300
L10
B EA D 300
C 12
0.1uGND
F1
1A
TX
RX
DSR
R DY
GN D
TM
Vde t
TM Vde t
GN D
1
2
3
4
JP 2
R NE_END
R TC _O
R TC _O
X2
32.76 8kHz
C 18
22pF
C 19
22pF
GN D
GN D
VC C
VC C
5
9
4
8
3
7
2
6
1
JP 3
DB 9_1
/LAT_P
C TSEN S
R 57
100
R 58
100
R 59
820
/R ESE T
D[0.. 31]
VC C
GA P_SENSER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
JP 4
C EN TRON IC
TTP-2410_MAIN
VD D
AV SS
C S0
C S2
C S3
C S0
C S2
C S3
SCK
SDI
SDO
SCK
SDI
SDO
VC C
1
R xD
2
TxD
3
GN D
4
D+
5
D-
6
R-
7
R+
8
U32
LTC490
GN D
VC C
R 80
120
R 81
120
L12
INDU C TO R1
L13
INDU C TO R1
L14
INDU C TO R1
L15
INDU C TO R1
VC C C SI
C SI
R 19
10K
P_INT
POW ER po we r.s ch
P_INT
1 2
U3A
74HC 1 4
3 4
U3B
74HC 1 4
5 6
U3C
74HC 1 4
R 20
10K
R 21
10K
R 22
10K
VC C
AV CC
AV SS
AVSS
GN D
L4
0
DIGITAL GND
C 20
0.01u F
B C1
10uF
R 60
100
R 61
100
D2
1N41 48
D3
1N41 48
D4
1N41 48
D5
1N41 48
C 23
0.1uF
C 24
0.1uF
AV CC VC C
L5
0
AV CC AVC C
AV SS AV SS
R 12
1K
R 13
1K
R 62
100
D6
1N41 48
D7
1N41 48
C 25
0.1uF
AV CC
AV SS
R 14
1K
3
2
1
4
11
U5A
LM3 24
R 63
100
GN D
VD D
GN D8 9
U3D
74HC 1 4
10 11
U3E
74HC 1 4
B M_ SEN
1
2
JP 5
2PIN
MA
MB
R 23
1.5K
R 24
1.5K
VD D
GN D
VC C
R 64
100
R 25
10K
12 13
U3F
74HC 1 4
5
6
7
U5B
LM3 24
R 65
100
GA P_E
B M_ E
R 26
10K
R 27
4.7K
ME
B C2
0.1uF
B C3
0.1uF
B C4
0.1uF
B C5
0.1uF
B C6
0.1uF
B C7
0.1uF
B C8
0.1uF
B C9
0.1uF
B C1 0
0.1uF
B C1 1
0.1uF
B C1 2
0.1uF
B C1 3
0.1uF
B C1 4
0.1uF
B C1 5
0.1uF
B C1 6
0.1uF
B C1 7
0.1uF
B C1 8
0.1uF
B C1 9
0.1uF
B C2 0
0.1uF
B C2 1
0.1uF
B C2 2
0.1uF
B C2 3
0.1uF
B C2 4
0.1uF
B C2 5
0.1uF
B C2 6
0.1uF
B C2 7
0.1uF
B C2 8
0.1uF
C 26
0.1uF
VC C
B C2 9
0.1uF
B C3 0
0.1uF
B C3 1
0.1uF
B C3 2
0.1uF
VC C
VC C
VC C
GN D
R 28
10K
1 2
U6A 74HC T14
Q3
2SC2 411K
R 29
10K
VD D
1
2
JP 9
NM IGN D
R 30
10K
VC C
SW1
SW-PB
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
VC C
VD D
VD D
P21
P22
VC C 1VC C 2
VC C 3
R 66
100
R 67
100
34
U6B 74 HC T14
56
U6C
74HC T14
8 9
U6D
74HC T14
PE
SELEC T
ERR OR
ERR OR
SELEC T
PE
VC C IO
1
GTS3
2
GT S4
3
4
GTS1
5
GTS2
6
7
VC C IN T
8
9
10
11
12
13
14
15
16
17
GN D
18
19
20
21
22
23
24
25
26
27
28
GN D
29
GC K1
30
31
GC K2
32
33
34
35
GN D
36
VC C IO
37
GC K3
38
39
40
41
VC C IN T
42
43
44
45
46
GN D
47
48
49
50
51
52
53
54
VC C IO
55
56
57
58
59
60
61
GN D
62
TDI
63
64
TMS
65
66
TCK
67
68
69
70
71
GN D
72
VC C IO
73
74
7576
77
78
79
80
81
82
83
VC C IN T
84
85
86
87
88
GN D
89
GN D
90
91
92
93
94
95
96
97
98
GN D
99
100
101
102
103
104
105
106
107
GN D
108
VC C IO
109
110
111
112
113
GN D
114
115
116
117
118
119
120
121
TDO
122
GN D
123
124
125
126
VC C IO
127
128
129
130
131
132
133
134
135
136
137
138
139
140
VC C IN T
141
142
GSR
143
GN D
144
U2
XC 951 44XL
R 31
10K
R 32
10K
10 11
U6E 74 HC T14
R 33
10K
R 34
10K
R 82
4.7K
C 39
1u
VD D
GN D
LCD _D/I
LCD _E
R 35
10K
R 36
10K
VD D
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
JP 10
PAN L
R 37
1K
VD D
R 68
100
GN D
LCD _B L
KEY 1
KEY 2 KEY 3
LED1 LED2
LED3
YELLOW
R ED
Q1
HSC 94 5
12 13
U6F
74HC T14
PH_I
/LAT_P
1
2
JP 11
B UZZER
RB
RA
Q4
HSC 94 5
R 38
10K
R 69
100
Q5
HSC 94 5
R 39
10K
R 70
100
VD D
R _EN D1
R _EN D2
R _EN D3
R _EN D0
M OTER_E
M OTER_C
R ED
YELLOW
HEA D_SENS
C ASE_SENS
R EN D_SENS
R _EN D
SENSO R
SENSO R.SC H
HEA D_SENS
C ASE_SENS
R EN D_SENS
R _EN D
HEA D_SENS
C ASE_SENS
1 2
U9A
74LS05
3 4
U9B
74LS05
5 6
U9C
74LS05
89
U9D
74LS05
R 84
3.3K
R 85
1.8K
R 86
910
R 87
430
R _EN D
R _EN D
R EN D_SENS
PEEL_S EN S
A0
53
A1
54
A2
55
A3
56
A4
58
A5
60
A6
61
A7
62
A8
63
A9
64
A10
65
A11
66
A12
67
A13
68
A14
70
A15
72
A16
73
A17
74
A18
75
A19
76
A20
77
A21
78
A22
80
A23
82
A24
84
A25
86
Vc cQ
59
Vc cQ
71
Vc cQ
85
Vc cQ
97
Vc cQ 111
Vc cQ 163
Vc cQ 183
Vs sQ
57
Vs sQ
69
Vs sQ
83
Vs sQ
95
Vs sQ109
Vs sQ161
Vs sQ181
Vs s
79
Vs s27
Vs s
132
Vs s
152
Vs s
153
Vs s
173
Vs sQ
19
Vs sQ
33
Vs sQ
45
Vc cQ
47
Vc cQ
35
Vc cQ
21
Vc c
175
Vc c
154
Vc c
134
Vc c
81
Vc c 29
D0
52
D1
51
D2
50
D3
49
D4
48
D5
46
D6
44
D7
43
D8
42
D9
41
D10
40
D11
39
D12
38
D13
37
D14
36
D15
34
PTB7 /D31
13
PTB6 /D30
14
PTB5 /D29
15
PTB4 /D28
16
PTB3 /D27
17
PTB2 /D26
18
PTB1 /D25
20
PTB0 /D24
22
PTA7/D 23
23
PTA6/D 22
24
PTA5/D 21
25
PTA4/D 20
26
PTA3/D 19
28
PTA2/D 18
30
PTA1/D 17
31
PTA0/D 16
32
/M C S7 /PIN T7 /PTC 7
177
/M C S6 /PIN T6 /PTC 6
178
/M C S5 /PIN T5 /PTC 5
179
/M C S4 /PIN T4 /PTC 4
180
/M C S3 /PIN T3 /PTC 3
185
/M C S2 /PIN T2 /PTC 2
186
/M C S1 /PIN T1 /PTC 1
187
/M C S0 /PIN T0 /PTC 0
188
TxD0 /SCPT0
164
SCK 0/SC PT1
165
TxD1 /SCPT2
166
SCK 1/SC PT3
167
TxD2 /SCPT4
168
SCK 2/SC PT5
169
R TS2 /SCPT6
170
R xD0/SC PT0
171
R xD1/SC PT2
172
R xD2/SC PT4
174
C TS2 /IR Q5/SC PT7
176
XT A L
155
E XT AL
156
XT A L2
4
E XT AL 2
5
Vs s- RT C
6
Vc c-RT C
3
AV cc205
AV s s208
Vs s- PL L 1
147
Vs s- PL L 2
148
Vc c-PL L1
145
Vc c-PL L2
150
AN 0/PTL0
199
AN 1/PTL1
200
AN 2/PTL2
201
AN 3/PTL3
202
AN 4/PTL4
203
AN 5/PTL5
204
DA 1/A N6/PTL6
206
DA 0/A N7/PTL7
207
M D1
1
M D2
2
M D3
195
M D4
196
M D5
197
AV s s198
M D0
144
C AP1
146
C AP2
149
C KIO
162
CA
194
/R AS3L/PTJ0
106
/R AS2L/PTJ1
107
/C ASLL/CAS /PTJ 2
108
/C ASU /CASLH /PTJ 3
110
/C ASH L/PTJ4
112
/C ASH H/PTJ 5
113
STATUS0/ PTJ 6
157
STATUS1/ PTJ 7
158
TDO /PTE0
120
/C AS2L/PTE6
116
/C AS2H /PTE3
117
/R AS3U /PTE2
118
/C AS2U /PTE1
119
/C E2 A/PTE4
103
/C E2 B/PTE5
104
PTE7
94
/R ESE T M
124
/R ESE T P
193
PTG0/A UTAD A0
135
PTG1/A UTAD A1
133
PTG2/A UTAD A2
131
PTG3/A UTAD A3
130
PTG4
129
/ASEBR K AK /PTG 5
128
/ASM D O/PTG6
127
IOIS16/PTG7
126
/WA IT
123
/B ACK
121
/B RE Q
122
/IRQ OUT
160
DR AK 1/PTD0
190
DR AK 0/PTD1
189
R ESTO UT/PTD2
184
W AKEUP /PTD3
182
/DR EQ0/PTD 4
191
/DR EQ1/PTD 6
192
/DAC K 0/PTD5
114
/DAC K 1/PTD7
115
/R D
88
/WE0 /DQM LL
89
/WE1 /DQM LU/ /WE
90
/WE2 /DQM U L//IC IORD /PTK6
91
/WE3 /DQM U U//ICIO WR /PTK 7
92
/WR /R D
93
/C S0/M CS0
96
/C S2/PTK0
98
/C S3/PTK1
99
/C S4/PTK2
100
/C S5//CE1A /PTK 3
101
/B S/PTK 4
87
C KE/PTK5
105
NM I
7
/C S6//CE1B
102
PTF7/PINT15
136
TRST/PTF6/PINT14
137
TRST/PTF5/PINT13
138
TRST/PTF4/PINT12
139
PTF3/PINT11
140
/IRLS2/PTF2/PINT10
141
/IRLS1/PTF1/PINT9
142
/IRLS0/PTF0/PINT8
143
/IRLO/IR Q0/PTH 0
8
/IRL1/IR Q1/PTH1
9
/IRL2/IR Q2/PTH2
10
/IRL3/IR Q3/PTH3
11
IRQ4 /PTH4
12
AD TRG /PTH 5
125
PTH6
151
T CL K/ PT H7
159
SH77 09A
U1
SH-770 9A
RB
RA
B UZZER
R 40
10K
VC C
R 71
100
B UZZER_O
B UZZER_O
B UZZER
DQ M UL
DQ M UL
DQ M UU
DQ M UU
BK
BK
VM M
R 41
10K
VC C
VD D
AG ND
AG ND
LCD _D0
LCD _D1 LCD _D 2
LCD _D3 LCD _D 4
LCD _D5 LCD _D 6
LCD _D7 LCD _C S1
LCD _C S2 LCD _/R ES
LCD _R /W LC D_D /I
LCD _E B AC K LIGHT
R Y
10
9
8
U5C
LM3 24
R 126
100
M OTER_C
B _IN1
B _IN2
B _IN3
B _OUT1
B _OUT2
B _OUT1
B _OUT2
B _IN1
B _IN2
B _IN3
AD 1
AD 2
B K_IO
B K_IO .SC H
B _OUT1
B _OUT2
B _IN1
B _IN2
B _IN3
AD 1
AD 2
B _OUT1
B _OUT2
B _IN1
B _IN2
B _IN3
C KE
/WE
/R D
DQ M LL
DQ M LU
/C AS
/R AS3L
A24
A25
/R ST
1
GN D
2
VC C 3
3
VC C 5
4
VC C A
5
U10
LTC172 8
VC C
VD D
VC C L
R2
3.4K
R3
3.0K
GN D
PR12
10K
PC4
220p
PC1
220p
PC2
220p
PC3
220p
PR110K
PR2
10K
PR3
10K
PR4
10K
PR5
10K
PR6
10K
PR7
10K
PR8
10K
PR9
10K PR10 10K
PR11
10K
PR14
10K
PR15
10K
PR16
10K
PR17
10K
PR18
10K
PR19
10K
PR20
10K
PR21
10K
PR22
100
PR23
100
PR24
100
PR25
100
R OM 1
R 130
10K
C 77
0.1uF
C 78
0.1uF
GN D GND
VC C
VM M
U
9
-
-
>
V
D
D
AD 1
AD 2
AD 1
AD 2
10 11
U4E
74HC 1 4
1213
U4F
74HC 1 4
1011
U9E
74LS05
1213
U9F
74LS05
VC C
GN D
1
2
JP 27
2PIN
R 95
10K
L24
B EA D 080 5 NB 22 0
1
2
JP 28
2PIN
PE_I
SELEC T_I
ERR OR _I
PE_I
SELEC T_I
ERR OR _I
VD D
GN D
GN D
Q14
HSC 94 5
Q15
HSC 94 5
1
2
3
4
5
6
7
JP 12
GA P_E&B M_S EN
R 137
100
TXD
TXD
L31
0
L30
0
R 138
100
R 139
100
R 140
100
C 82
0.1u
C 83
0.1u
C 84
0.1u
GN D
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