TSC TTP 246M User manual

TTP 246M/344M
SERVICE
MANUAL
THERMAL TRANSFER / DIRECT THERMAL
BAR CODE PRINTER

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TTP-246M/344M Bar Code Printer
Service Manual
TABLE OF CONTENT
1. FoundamentalsAbout the System..............................................................................1
1.1Printer Overview........................................................................................................1
1.1.1 Front View........................................................................................................1
1.1.2 Rear View ........................................................................................................1
1.2 Pinter Specification...................................................................................................2
1.3 Available Bar Codes.................................................................................................4
2. Supply Specifications .................................................................................................5
2.1 Label Specification ...................................................................................................5
2.2 Ribbon Specification.................................................................................................5
3.Circuit Description.......................................................................................................7
3.1 PCB Function...........................................................................................................7
3.2 MCU PIN Description............................................................................................... 9
3.3 Reset Circuit........................................................................................................... 11
3.4 Memory Circuit....................................................................................................... 11
3.5 Decoder Circuit and Memory Map.......................................................................... 12
3.6 Print Head Circuit...................................................................................................15
3.7 Motor Circuit...........................................................................................................16
3.8 Cutter Circuit..........................................................................................................16
3.9 Parallel Port Circuit................................................................................................. 17
3.10 Serial Port Circuit .................................................................................................17
3.11 USB Circuit...........................................................................................................18
3.11.1 Gap/Black Mark sensor.....................................................................................18
3.11.2 Case Open Sensor............................................................................................19
3.11.3 Ribbon End Sensor...........................................................................................19
3.11.4 Head Open Sensor............................................................................................20
3.11.5 Peel-off Sensor..................................................................................................20
3.12 Summary of PCB connectors......................................................................... 21
3.12.1 TTP-246M & 344M PCB Top Side.....................................................................22
3.12.2 TTP-246M & 344M PCB Bottom Side...............................................................23
4. Mechanism...............................................................................................................24
4.1 Remove Covers, LCD Panel and Lower Front Panel.............................................24
4.2 Replacing the All Harness on Main PCB................................................................28
4.3 Replacing Power Supply Unit.................................................................................29
4.4 Replacing Belt and Gears ...................................................................................... 30
4.5 Replacing Ribbon Rewind Spindle ......................................................................... 33

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TTP-246M/344M Bar Code Printer
Service Manual
4.6 Replacing Ribbon Supply Spindle ..........................................................................35
4.7 Replacing Label Supply Spindle.............................................................................37
4.8 Replacing Platen.................................................................................................... 39
4.9 Replacing Stepping Motor......................................................................................41
4.10 Replacing Print Head ...........................................................................................42
4.11 Replacing Print Head Adjustment Knob................................................................43
4.12 Replacing Gap / Black Mark Sensor..................................................................... 45
4.13 Replacing Ribbon Sensor.....................................................................................48
4.14 Replacing Print Head Lift Sensor .........................................................................50
4.15 Replacing Internal Print Server Module................................................................51
4.16 Peeler Kit Installation (Option).............................................................................. 54
4.17 Loading Label For Peel-off Mode.........................................................................60
4.18 Cutter Module Installation (Option)....................................................................... 63
5. POWER ON UTILITIES............................................................................................64
5.1 Calibrate Gap/Black Mark Sensor..........................................................................64
5.2 Self-test..................................................................................................................64
5.3 Printer Initialization.................................................................................................65
6. Troubleshooting........................................................................................................67
7. MAINTENANCE.......................................................................................................69
Update History..............................................................................................................70

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TTP-246M/344M Bar Code Printer
Service Manual
1. FOUNDAMENTALS ABOUT THE SYSTEM
1.1Printer Overview
1.1.1 Front View
Fig. 1.1 Printer Front View
1.1.2 Rear View
Fig. 1.2 Printer Rear View
Aux. LED
LCD Display
Printer Right
Side Cover
External Label
Feed Opening
Centronics Port
RS-232C Port
Power Switch
Power Supply
Connector
Keys

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TTP-246M/344M Bar Code Printer
Service Manual
1.2 Pinter Specification
Item
Specification
Printing Mode
Thermal transfer and direct thermal
Resolution
203DPI(TTP246M), 300 DPI (TTP344M)
Max. Print Length
1000 mm (TTP246M), 460 mm (TTP344M)
Max. Print Width
108 mm (TTP246M), 104 mm (TTP344M)
Print Speed
3,4,5,6 ips (TTP246M); 2,3,4 ips (TTP344M)
Environment
Temperature
5 ~40 OC
Humidity
30 ~ 85 %
Temperature
-10 ~ 60 OC
Humidity
20 ~ 95 %
Ventilation
Free air environment
Electrical
Sensors
Label gap sensor, ribbon end sensor, black mark
sensor, head open sensor, label taken sensor
Interface
RS-232C (RS422/485 option), Centronics (SPP),
USBV1.1 and internal LAN adapter (option).
Cutter
4 inch width (Paper thickness up to 0.25 mm)
Power
100-240 V universal switching power supply.
Other
Real Time Clock
CPU
HITACH SH2 7040A
TPH
246M KPC-108-8TA01
344M KPC-106-12TA01
Stepping Motor
KH42JM2B165
Compliance
CE, UL/CUL, BSMI, FCC Class A, TÜ V-GS
Memory
Flash ROM (2MB), DRAM (2MB) and 8M optional flash
ROM (memory module)

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TTP-246M/344M Bar Code Printer
Service Manual
Communication Interface
Communication
RS-232C (DB-9) at 2400, 4800, 9600 or 19200 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
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
Cutter off Mini-DIN Connector Pin Assignment
Mini-DIN
PCB JP10 connector
Pin 1
Pin 1, brown
Pin2
Pin 3, red
Pin 3
Pin 2, orange
Pin 4
Pin 4, yellow
Peeler Mini-DIN Connector Pin Assignment

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TTP-246M/344M Bar Code Printer
Service Manual
Mini-DIN
PCB JP20 connector
Pin 5
Pin 1, brown
Pin 6
Pin 2, red
Pin 7
Pin 3, orange
Pin 8
Pin 4, yellow
1.3 Available Bar Codes
Code 39
Code 39C
Code 93
Code128 subsets A.B.C
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
EAN-14
ITF-14
PDF-417
Maxicode
DataMatrix
QR code

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TTP-246M/344M Bar Code Printer
Service Manual
2. SUPPLY SPECIFICATIONS
2.1 Label Specification
Item
Specification
Type
Roll and label (Continuous, die-cut, fan-fold, ticket and
tag is option)
Label Width
25.4～116 mm ( 1”～4.4” )
Label Length
TTP-246M 10～1000 mm ( 0.4”～39.33” )
TTP-344M 10~460 mm (0.4”~18”)
Label Thickness
0.06～0.25 mm
Label Roll Diameter
203 mm (Max.)
Roll Up Method
Print surface wound outside as standard.
Roll Core Diameter
25 or 77 mm
Black Mark Width
3 mm ( Min.)
2.2 Ribbon Specification
Item
Specification
Ribbon Width
25.4～114.3 mm
Ribbon Length
300 m (Max.)
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

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TTP-246M/344M Bar Code Printer
Service Manual
L = Ribbon length
D = Max. roll diameter
d = Ribbon core outside diameter
t = Ribbon thickness

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TTP-246M/344M Bar Code Printer
Service Manual
3.CIRCUIT DESCRIPTION
3.1 PCB Function
The mainboard of TTP-344M/246M includes nine system blocks.
1. Memory System
2. Sensor System
3. Decoder System
4. RTC, EEPROM, LCD System
5. Print Head Connector System
6. Motor System
7. Power System
8. USB System
9. Communication Port