TABLE OF CONTENT
1. Foundamentals About 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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