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TTP-248M Bar Code Printer
Service Manual
TABLE OF CONTENT
1. Foundamentals About 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 MCU 10
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