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The Speaker Company
TTP 248M
service manual
Models:
TTP 248M
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Troubleshooting
Specs
Reset Circuit
Connector Circuits
Diagnosis Operation Procedure
Update History
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TTP 248M
THERMAL TRANSFER / DIRECT THERMAL BAR CODE PRINTER
SERVICE
MANUAL
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Contents
TTP 248M
TTP-248M Bar Code Printer
Table of Content
TTP-248M Bar Code Printer
Printer Overview
Foundamentals about the System
Specification
TTP-248M Bar Code Printer Pinter Specification
Communication Interface
Available Bar Codes
Text Specification
File Head of Font Fixed 32bytes
BF3~4 VF3~4
Types of Paper
Specification
TTP-248M Bar Code Printer Ribbon Specification
MCU
Circuit Description
MCU
MCU PIN Description
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Reset Circuit
TTP-248M Bar Code Printer Reset Circuit
Etro N Tech
TTP-248M Bar Code Printer Memory System
Memory Address Map
Decoder Circuits
Use by CPU Area Internal I/O
Sdram
TTP-248M Bar Code Printer Firmware Address Map
VCC
TTP-248M Bar Code Printer Power Down Sensor
GND
TTP-248M Bar Code Printer Print Head
Stepping Motor Pattern
Motor System Circuit
Ribbon Near End Sensor
TTP-248M Bar Code Printer Sensor Circuits
10 Black mark/ Gap Sensor Circuit Peel-off Sensor
11 Peel-off Sensor Circuit Case Sensor
GND VDD
Serial Port Circuit
VDD
Parallel Port Circuit
17 Cutter Drive Circuit
TTP-248M Bar Code Printer Cutter Drive System
Connector Circuits
TTP-248M Bar Code Printer PIN Switch Circuits
21 Memory Card Connector
23 Stepping Motor Connector
Optional Item---Buzzer
TTP-248M Bar Code Printer Optional Items Circuits
Remove the Covers and LCD Panel
Machanism
Loosen the three screws on Top Left Side Cover
Screw LCD Panel Lower Front Cover
TTP-248M Bar Code Printer Replacing the Mainboard
TTP-248M Bar Code Printer Replacing the Power Supply Unit
Belt Ring of Label Rewind Spindle
Remove the E-ring of pulley. And then, remove the pulley
TTP-248M Bar Code Printer
TTP-248M Bar Code Printer Replacing Ribbon Supply Spindle
TTP-248M Bar Code Printer
TTP-248M Bar Code Printer Replacing Label Supply Spindle
TTP-248M Bar Code Printer
TTP-248M Bar Code Printer Replacing Label Rewind Spindle
TTP-248M Bar Code Printer
TTP-248M Bar Code Printer Replacing Platen
Remove the Platen and Left Shaft Bearing
TTP-248M Bar Code Printer Replacing Motor
TTP-248M Bar Code Printer
TTP-248M Bar Code Printer Replacing Print Head
Remove the 2 screws these are on the TPH switch plate
Remove A.B.C.D in order Loosen M4 screw, knob E and F
TTP-248M Bar Code Printer Replacing Gap/Black Mark Sensor
TTP-248M Bar Code Printer
Reassemble in the reverse procedures after replacing
Curly plastic pipe Screws
Troubleshooting
Troubleshooting
Flash / Dram
Calibrate Gap/Black Mark Sensor
TTP-248M Bar Code Printer Self-test
Diagnosis Operation Procedure
Dram Clear
TTP-248M Bar Code Printer Cleaning Print Head
Update History
No.35, Sec , Ligong 1st Rd., Wujie Township
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