The Speaker Company TTP 248M User Manual

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TTP-248M Bar Code Printer
Service Manua

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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

3.2 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

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