TSC TTP-248M User manual

TTP 248M
SERVICE
MANUAL
THERMAL TRANSFER / DIRECT THERMAL
BAR CODE PRINTER

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TTP-248M Bar Code Printer
Service Manual
TABLE OF CONTENT
1. FoundamentalsAbout the System..............................................................................1
Printer Overview......................................................................................................1
Front View........................................................................................................1
Rear View ........................................................................................................1
1.2 Pinter Specification............................................................................................2
1.3 Available Bar Codes..........................................................................................4
1.4 Text Specification ..............................................................................................5
Specification of Fonts.......................................................................................5
File Head of Font ( Fixed 32bytes )..................................................................6
VF1~4..............................................................................................................6
BF3~4 VF3~4...................................................................................................7
2. Supply Specifications .................................................................................................8
2.1 Types of Paper..................................................................................................8
2.2 Specification......................................................................................................8
2.3 Ribbon Specification..........................................................................................9
3. Circuit Description.................................................................................................10
3.1 MCU10
3.2 MCU PIN Description......................................................................................12
3.3 Reset Circuit....................................................................................................21
3.4 Memory System..............................................................................................22
3.5 Decoder Circuits..............................................................................................23
3.6 Memory Address Map .....................................................................................23
3.7 Firmware Address Map ...................................................................................26
3.8 Power Down Sensor...............................................................................27
3.9 Print Head.......................................................................................................28
3.10 Motor System Circuit.....................................................................................29
3.11 Sensor Circuits..............................................................................................30
3.12 Serial Port Circuit..........................................................................................33
3.13 Parallel Port Circuit .......................................................................................34
3.14 Cutter Drive System......................................................................................35
3.15 PIN Switch Circuits........................................................................................36
3.16 Connector Circuits.........................................................................................36
3.17 Optional Items Circuits..................................................................................39
4. Machanism............................................................................................................40
4.1 Remove the Covers and LCD Panel ...............................................................40

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TTP-248M Bar Code Printer
Service Manual
4.2 Replacing the Mainboard ................................................................................43
4.3 Replacing the Power Supply Unit....................................................................44
4.4 Replacing the Ribbon Rewind Spindle............................................................45
4.5 Replacing Ribbon Supply Spindle...................................................................48
4.6 Replacing Label Supply Spindle......................................................................50
4.7 Replacing Label Rewind Spindle.....................................................................52
4.8 Replacing Platen.............................................................................................54
4.9 Replacing Motor..............................................................................................56
4.10 Replacing Print Head ....................................................................................58
4.11 Replacing Print Head Pressure Adjustment Knob .........................................59
4.12 Replacing Gap/Black Mark Sensor ...............................................................61
4.14 Replacing Print Head Lift Lever Sensor ........................................................64
5. Troubleshooting........................................................................................................65
5.1 Troubleshooting...............................................................................................65
5.2 Calibrate Gap/Black Mark Sensor...................................................................66
5.3 Self-test...........................................................................................................67
5.4 DRAM Clear....................................................................................................67
5.5 Diagnosis Operation Procedure......................................................................67
5.6 Cleaning Print Head........................................................................................68
Update History..............................................................................................................69

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TTP-248M Bar Code Printer
Service Manual
1. FOUNDAMENTALS ABOUT THE SYSTEM
Printer Overview
Front View
Fig. 1.1 Printer Front View
Rear View
Fig. 1.2 Printer Rear View
Aux. LED
LCD Display
Printer Cover
External Label
Feed Opening
Aux. Buzzer
Centronics Port
RS-232C Port
Voltage Switch
Power Supply
Connector

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TTP-248M Bar Code Printer
Service Manual
1.2 Pinter Specification
Item
Specification
Printing Mode
Thermal transfer and direct thermal
Resolution
203 DPI
Max. Print Length
999 mm
Max. Print Width
104 mm
Print Speed
Selectable speed of 4,6,8 inch per second
Environment
Temperature
5 ~40 OC
Humidity
30 ~ 85 %
Temperature
-10 ~ 60 OC
Humidity
20 ~ 95 %
Ventilation
Free air environment
Sensors
Label gap (256-level), ribbon end (16-level), black
mark (256-level), carriage open, ribbon near end
Memory
Flash Memory 2MB, DRAM 4MB and optional Flash
Memory 8MB
Interface
RS-232C 56000bps ( Max.), Centronics
Cutter
116 mm width (Paper thickness up to 0.28 mm)
Power
100 VAC to 120 VAC, 200 VAC to 240 VAC
Switching mode power supply.
Input Frequency : 50Hz to 60Hz
Input Current : 4.0 Amps at max.
Inrush Current :
40 Amps max. (cold start) at 115 VAC input line
voltage.
80 Amps max. (cold start) at 230 VAC input line
voltage.
Electrical
CPU
HITACH SH 7709A

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TTP-248M Bar Code Printer
Service Manual
TPH
ROHM KF2004-GL41D 550Ω
Stepping Motor
Mitsumi 24V 7.5 Degrees 4Ω Japan Servo KH56KM
2u023 1.80,24V,0.36Ω
Memory
SDRAM, 1M×16Brt×2 7ns
Flash Memory: (512K×16Bit) ×2 70ns
Compliance
CE, UL/CUL, BSMI, FCC Class A, TÜ V-GS
Communication Interface
Communication
RS-232C (DB-9) at 2400, 4800, 9600 or 19200 38400,
56000, 57600, 115200, 128000, 50000 baud rate
Word Length
7 or 8 data bits, 1 or 2 stop bits, selectable parity
Communication Protocol
XON/XOFF and DSR/DTR
Parallel Port
Standard parallel interface
Input Buffer
10KB

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TTP-248M Bar Code Printer
Service Manual
RS-232 Interface Pin Configuration:
Host
Function
9 Pin
25 Pin
9 Pin
Printer
Function
1
+5V
RxD
2
3
2
TxD
TxD
3
2
3
RxD
DTR
4
20
4
DSR
GND
5
7
5
GND
DSR
6
6
6
RDY
RTS
7
4
7
N/C
CTS
8
5
8
RDY
9
+5V
1.3 Available Bar Codes
Code 39
Code 39C
Code 93
Code128UCC
Code128 subsets A.B.C
Code 11
Codabar
Interleave 2 of 5
EAN-8
EAN-13
EAN-128
UPC-A
UPC-E
EAN and UPC 2(5) digits add-on
CPOST
MSI
PLESSEY
POSTNET

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TTP-248M Bar Code Printer
Service Manual
EAN-14
ITF14
PDF-417
Maxicode
DataMatrix
1.4 Text Specification
Font
Width x Length
Font 1
8x12
Font 2
12x20
Font 3
16x24
Font 4
24x32
Font 5
32x48
Font 6
14x19 OCRB
Font 7
21x27 OCRB
Font 8
14x25 OCRA
Font
Width x Length
EAN 1
7x10
EAN 2
14x22
EAN 3
21x33
EAN 4
28x43
EAN 5
35x52
EAN 6
42x64
EAN 7
49x74
EAN 8
56x85
EAN 9
63x97
EAN 10
70x107
Font 1 to Font 8 are all build-in fonts and BF1 fonts.
EAN 1 to EAN 10 are the fonts used on Barcode UPC and EAN series (they
content numbers only).
The above are the fonts we approve on our printers.
Specification of Fonts
Fixed Pixel
Variable Pixel
Singed byte
Double byte
Decode by Table
BF1
X
X

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TTP-248M Bar Code Printer
Service Manual
BF2
X
X
BF3
X
X
X
BF4
X
X
X
VF1
X
X
VF2
X
X
VF3
X
X
X
VF4
X
X
X
File Head of Font ( Fixed 32bytes )
Offset 0
B->Bitmap font
Offset 1
0->Fixed pixel 1->Variable Pixel
Offset 2
0->Singed Byte Decode 1->Double Byte
Decode
Offset 3
Decode by table
Offset 4
0-> None 1->Italic
Offset 5-6
Font Height
Offset 7-8
Font Width
Offset 9-10
Font decode start
Offset 11-12
Font decode end
Offset 13
Font decode type
Offset 14
Reserved
Offset 15-16
Font character total
Offset 17-18
Italic Width Variable
Offset 19-31
Reserved
If ( BF1 BF2 VF1 VF2 )
Offset 32-xx : Font Data
Else if( BF3 BF4 VF3 VF4 )
Offset 32-xx : Decoded Table
Offset xx-xx : Font Data
VF1~4
Font data of variable pixel
(width low byte)(width high byte) Font Data
Font of variable printing spacing is two-bite-width of word in front of the data of
every word.

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TTP-248M Bar Code Printer
Service Manual
BF3~4 VF3~4
Decode Table
(char low byte) (char high byte) (offset 4 bytes ==> file start to font data)
The font with decade table, the previous two bytes of every word is the code of the
word, and the later four bytes is the displacement from the file head to the position
of the data of the word.

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TTP-248M Bar Code Printer
Service Manual
2. SUPPLY SPECIFICATIONS
2.1 Types of Paper
Two types of media are available for TTP-248M/2410M : label and ticket.
In TTP-248M/2410M, there are two types of sensors for paper : gap sensor and
black mark sensor.
Label and ticket can be further classified into direct thermal type or thermal transfer
type.
2.2 Specification
Item
Specification
Type
Label (Continuous, die-cut, fan-fold, ticket, Tag etc.)
Label Width
19～118 mm ( 0.7”～4.65” )
Label Length
10～999 mm ( 0.4”～39.33” )
Label Thickness
0.06～0.25 mm
Label Roll Diameter
203 mm
Paper Core ID
25.7± 0.3 mm
Paper Weight
Less than 280 g/m2
Rewinder Roll diameter
138 mm (Max.) with 1" core
Label Roll Diameter
without Rewinder
254 mm (Max.) with 3" core
Roll Core Diameter
25 ~ 77 mm
Black Mark Height
1.5 mm ( Min.)
Black Mark Width
3 mm ( Min.)

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TTP-248M Bar Code Printer
Service Manual
2.3 Ribbon Specification
Item
Specification
Ribbon Shape
Spool type
Ribbon Width
25.4～114.3 mm
Ribbon Length
450 m
Diameter
Less than 3.5” ( 89 mm)
Roll Up Method
Print surface wound outside as standard.
Note: The maximum length of ribbon depends on its thickness and core outside
diameter.
The formula below defines the correlation between ribbon roll length and ribbon core
diameter.
t4 )d(D
=L 22
 
, where
L = Ribbon length
D = Max. roll diameter
d = Ribbon core outside diameter
t = Ribbon thickness

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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 G ND
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
)
GND
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 U TTER
PHA SE
/B K
C TSEN S
/INB _R
/INA_R
M OTER_C
PEEL_SEN S
M OTO R
M OTO R.SC H
EN_M B
INB_ R
INA_ R
EN_M A
EN_C U TTER
PHA SE
/B K
C TSEN S
/INB _R
/INA_R
M OTER_C
PEEL_SEN S
KEY1
KEY2
KEY3
B1
B UZZER R 10
10K
R 11
1K
TH_SENS
HEAD_SENS
C ASE_SENS
PEEL_SEN S
R END_ SENS
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
VDD
R 17
10K
LCD _D 0
LCD _D 1
LCD _D 2
LCD _D 3
LCD _D 4
LCD _D 5
LCD _D 6
LCD _D 7
LCD _C S2
LCD _C S1
LCD _W /R
GND
GNDD IGITAL GN D
SELECT
PE
ERR OR
/Wa it
/DStrb
/Init
/AStrb
VDD R 18
10K
R 56 100
C5
220p
VDD
VDD
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 .SC H
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
JP1
JTAG
GND
VC C
DI3
DI1
DI2
DI4
C LK
/LAT
TM
STB1
STB2
STB3
STB4
Vde t
/R ESET_PH
PRIN THEAD
PRIN T.SC H
DI3
DI1
DI2
DI4
C LK
/LAT
TM
STB1
STB2
STB3
STB4
Vde t
/R ESET_PH
PH_I
/R ES ET
C LK
STB1_I
STB2_I
STB3_I
STB4_I
VC C
GND
C 1+ 1 V+
2
C 1- 3
C 2+ 4
C 2- 5
V-
6
T2OUT
7
R 2IN
8R 2OU T 9
T2IN 10
T1IN 11
R 1OU T 12 R 1IN
13 T1OUT
14
VC C 16
GND
15
U31
SP3232 E
C9
0.1u
C 10
0.1u
VC C
C 11
0.1u
C 17
0.1u
GND
GND
L7
B EAD 300
L8
B EAD 300
L9
B EAD 300
L10
B EAD 300
C 12
0.1uGND
F1
1A
TX
RX
DSR
R DY
GND
TM
Vde t
TM Vde t
GND
1
2
3
4JP2
R NE_END
R TC_O
R TC _O
X2
32.76 8kHz
C 18
22pF
C 19
22pF
GND
GND
VC C
VC C
5
9
4
8
3
7
2
6
1
JP3
DB 9_1
/LAT_P
C TSEN S
R 57
100
R 58
100
R 59
820
/R ES ET
D[0..31]
VC C
GAP_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
JP4
C ENTRON IC
TTP-2410_MAIN
VDD
AVSS
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
GND 4 D+
5
D-
6
R-
7
R+
8
U32
LTC490 G ND
VC C
R 80
120
R 81
120
L12
INDU C TOR1
L13
INDU C TOR1
L14
INDU C TOR1
L15
INDU C TOR1
VC C C SI
C SI
R 19
10K
P_INT
POW ER po we r.sc h
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 C C
AVSS
AVSS
GND
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 C C VC C
L5
0
AV C C AV C C
AVSS AVSS
R 12
1K R 13 1K
R 62
100
D6
1N41 48
D7
1N41 48
C 25
0.1uF
AV C C
AVSS
R 14
1K
3
21
4
11
U5A
LM3 24
R 63
100
GND
VDD
GND8 9
U3D
74HC 1 4
10 11
U3E
74HC 1 4
B M_ SEN
1
2
JP5
2PIN
MA
MB
R 23
1.5K
R 24
1.5K V DD
GND
VC C
R 64
100
R 25
10K
12 13
U3F
74HC 1 4
5
67
U5B
LM3 24
R 65
100
GAP_E
B M_ E
R 26
10K
R 27
4.7K
ME
B C2
0.1uF B C 3
0.1uF B C 4 0.1uF B C 5 0.1uF B C 6 0.1uF B C 7 0.1uF B C 8 0.1uF B C 9 0.1uF B C 10 0.1uF
B C1 1
0.1uF B C 12 0.1uF B C 13 0.1uF B C 14 0.1uF B C 15 0.1uF
B C1 6
0.1uF B C 17
0.1uF B C 18 0.1uF B C 19 0.1uF B C 20 0.1uF B C 21 0.1uF B C 22 0.1uF B C 23 0.1uF B C 24 0.1uF B C 25 0.1uF
B C2 6
0.1uF B C 27 0.1uF B C 28 0.1uF C 26 0.1uF
VC C
B C2 9
0.1uF
B C3 0
0.1uF B C 31 0.1uF B C 32 0.1uF
VC C
VC C
VC C
GND
R 28
10K
1 2
U6A 74HC T14
Q3
2SC2 411K
R 29
10K
VDD
1
2
JP9
NM IGND
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
VDD
VDD
P21
P22
VC C 1VC C 2
VC C 3
R 66
100
R 67
100
34
U6B 74HC T14
56 U6C
74HC T14
8 9
U6D
74HC T14
PE
SELECT
ERR OR
ERR OR
SELECT
PE
VC C IO 1
GTS3 2
GT S4
3
4
GTS1 5
GTS2 6
7
VC C INT 8
9
10
11
12
13
14
15
16
17
GND
18
19
20 21 22 23 24
25
26
27
28
GND
29
GC K1 30
31
GC K2 32
33
34
35
GND
36
VC C IO 37
GC K3 38
39
40
41
VC C INT 42
43
44
45
46
GND
47
48
49
50
51
52
53
54
VC C IO 55
56
57
58
59
60
61
GND
62
TDI 63
64
TMS 65
66
TCK 67
68
69
70
71
GND
72
VC C IO 73
74 7576 77
78
79
80
81
82
83
VC C INT 84
85
86
87
88
GND
89
GND
90
91
92
93
94
95
96
97
98
GND
99
100
101
102
103
104
105
106
107
GND
108
VC C IO 109
110
111
112
113
GND
114
115
116
117
11 8
119
120
121
TDO 122
GND
123
124
125
126
VC C IO 127
128
129
130
131
132
133
134
135
136
137
138
139
140
VC C INT 141
142
GSR 14 3
GND
144
U2
XC 951 44X L
R 31
10K R 32
10K
10 11
U6E 74HC T14
R 33
10K
R 34
10K R 82 4.7K
C 39
1u
VDD
GND
LCD _D /I
LCD _E
R 35
10K
R 36
10K
VDD
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
JP10
PAN L
R 37
1K
VDD
R 68
100
GND
LCD _B L
KEY1
KEY2 KEY3
LED1 LED2
LED3
YELLOW
R ED
Q1
HSC 94 5
12 13
U6F
74HC T14
PH_I
/LAT_P
1
2JP11
B UZZER
RB
RA
Q4
HSC 94 5
R 38
10K
R 69
100
Q5
HSC 94 5
R 39
10K
R 70
100
VDD
R _END 1
R _END 2
R _END 3
R _END 0
M OTER_E
M OTER_C
R ED
YELLOW
HEAD_SENS
C ASE_SENS
R END_ SENS
R _END
SENSO R
SENSO R.SC H
HEAD_SENS
C ASE_SENS
R END_ SENS
R _END
HEAD_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 _END
R _END
R END_ SENS
PEEL_SEN 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 V ssQ161 Vss Q181
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/D 31 13
PTB6/D 30 14
PTB5/D 29 15
PTB4/D 28 16
PTB3/D 27 17
PTB2/D 26 18
PTB1/D 25 20
PTB0/D 24 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/PINT7/PTC 7
177 /M C S6 /PIN T6/PTC6
178 /M C S5 /PIN T5/PTC5
179 /M C S4 /PIN T4/PTC4
180 /M C S3 /PIN T3/PTC3
185
/M C S2/PINT2/PTC 2
186
/M C S1/PINT1/PTC 1
187
/M C S0/PINT0/PTC 0
188
TxD0/S CPT0
164
SCK 0/SC PT1
165
TxD1/S CPT2
166
SCK 1/SC PT3
167
TxD2/S CPT4
168
SCK 2/SC PT5
169
R TS2 /SCP T6
170
R xD0/S CPT0
171
R xD1/S CPT2
172
R xD2/S CPT4
174
C TS2 /IRQ 5/SCP T7
176
XT A L 155
E XT AL 15 6
XT A L2
4
E XT AL 2
5
Vs s-R T C
6
Vc c-RT C
3
AVcc20 5 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
AN0/PTL0 199
AN1/PTL1 200
AN2/PTL2 201
AN3/PTL3 202
AN4/PTL4 203
AN5/PTL5 204
DA1/A N6/PTL6 206
DA0/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 /PTJ2
108
/C ASU /CA SLH/PTJ3 110
/C ASH L/PTJ4 112
/C ASH H/PTJ 5 11 3
STATUS0/ PTJ 6
157
STATUS1/ PTJ 7
158
TDO/PTE0
120
/C AS2L/PTE6
116
/C AS2H /PTE3
117
/R AS3U /PTE2
118 /C AS 2U/PTE1
119
/C E2A/PTE4
103 /C E2B /PTE5
104
PTE7
94
/R ES ET M
124 /R E SE T P 193
PTG0/A UTAD A0 13 5
PTG1/A UTAD A1
133
PTG2/A UTAD A2
131
PTG3/A UTAD A3
130
PTG4 129
/ASEBR K AK /PTG5 128
/ASM D O/PTG6 12 7
IOIS16/PTG7 12 6
/WA IT
123
/B AC K
121
/B RE Q
122
/IRQ OU T
160
DR AK1/PTD0 190
DR AK0/PTD1 189
R ESTO UT/PTD2 184
WAKEUP/PTD3 182
/DR EQ0/PTD 4 191
/DR EQ1/PTD 6 192
/DAC K 0/PTD5 11 4
/DAC K 1/PTD7 11 5
/R D
88
/WE0 /DQM LL
89
/WE1 /DQM LU/ /WE
90
/WE2 /DQM U L//ICIOR D /PTK6
91
/WE3 /DQM U U //ICIOW R /PTK7
92
/WR /R D
93
/C S0/M CS 0
96
/C S2/PTK0
98
/C S3/PTK1
99
/C S4/PTK2 100
/C S5//C E1A/PTK3 101
/B S/PTK 4 87
C KE/PTK5
105
NM I
7
/C S6//C E1B
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/P TH0 8
/IRL1/IR Q1/PTH 1 9
/IRL2/IR Q2/PTH 2 10
/IRL3/IR Q3/PTH 3 11
IRQ4 /PTH4 12
ADTRG /PTH5 125
PTH6 151
T CL K/ PTH 7
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
VDD
AGND
AGND
LCD _D 0
LCD _D 1 LCD _D 2
LCD _D 3 LCD _D 4
LCD _D 5 LCD _D 6
LCD _D 7 LCD _C S1
LCD _C S2 LCD _/R ES
LCD _R /W LCD _D /I
LCD _E B AC K LIG HT
R Y
10
98
U5C
LM3 24
R 126
100
M OTER_C
B _IN1
B _IN2
B _IN3
B _OU T1
B _OU T2
B _OU T1
B _OU T2
B _IN1
B _IN2
B _IN3
AD1
AD2
B K_IO
B K_IO .SCH
B _OU T1
B _OU T2
B _IN1
B _IN2
B _IN3
AD1
AD2
B _OU T1
B _OU T2
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
GND 2
VC C 3
3
VC C 5
4
VC C A
5
U10
LTC172 8
VC C
VDD
VC C L
R2
3.4K
R3
3.0K
GND
PR12
10K
PC4 22 0p PC1 22 0p PC 2 22 0p PC3 22 0p
PR1 10 K PR 2 10 K PR 3 10 K PR 4 10 K
PR5
10K
PR6 10 K PR7 10 K PR8 10 K
PR9
10K PR 10 10K
PR11
10K
PR14
10K
PR15
10K
PR16
10K
PR17
10K
PR18
10K
PR19
10K
PR20
10K
PR21 10 K
PR22 10 0
PR23 10 0
PR24 10 0
PR25 10 0
R OM 1
R 130
10K
C 77
0.1uF C 78
0.1uF
GND GND
VC C
VM M
U
9
-
-
>
V
D
D
AD1
AD2
AD1
AD2
10 11
U4E
74HC 1 4
1213
U4F
74HC 1 4
1011
U9E
74LS05
1213
U9F
74LS05
VC C
GND
1
2JP27
2PIN
R 95
10K
L24
B EAD 0805 N B 22 0
1
2
JP28
2PIN
PE_I
SELECT_I
ERR OR _I
PE_I
SELECT_I
ERR OR _I
VDD
GND
GND
Q14
HSC 94 5
Q15
HSC 94 5
1
2
3
4
5
6
7
JP12
GA P_E&B M _SEN
R 137
100
TXD
TXD
L31
0
L30
0
R 13810 0
R 139 10 0
R 140 100
C 82
0.1u
C 83
0.1u C 84 0.1u
GND
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

11
TTP-248M Bar Code Printer
Service Manual
The figure below shows the PCB system area:
Fig. 3.2 System Block of PCB
MCU
Communication port
Decoder
System
External Memory
Connector
Memory
System
Cutter System
Motor
System
Power
System
Print
Head
Connector
Sensor
Connector
Option I/O

12
TTP-248M Bar Code Printer
Service Manual
3.2 MCU PIN Description

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TTP-248M Bar Code Printer
Service Manual

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TTP-248M Bar Code Printer
Service Manual

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TTP-248M Bar Code Printer
Service Manual

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TTP-248M Bar Code Printer
Service Manual

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TTP-248M Bar Code Printer
Service Manual