Tally T6215 Maintenance Manual - Technical Overview

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Chapter 1. Technical Overview

Technical Overview

The T6215 is a high speed, low cost, line impact dot matrix printer.  It's maximum

print speed is 1500 lines per minute in uppercase draft text mode.  It prints many

fonts in a number of languages, and plots raster graphics and images at a wide

variety of dot densities.  The T6215 comes standard with Serial and Parallel inter-

faces and supports other interfaces through the use of user-installable PSIO inter-

face cards.  OEM add-in cards are supported via an internal IEEE 1284 connector.

The T6215 does not accept the T6090/T6180 "Personality Module" cards.

T6215 Electronic Hardware Architecture

The electronic design of the T6215 is implemented in two basic modules: the

Engine Control Module and the Hammer Driver Module.

Engine Control Module

The primary components of the Engine Control Module are:

• Main Processor - Motorola Cold Fire

®

 5307

• Flash Memory - 2 M-bytes

• SDRAM - 2 M-bytes

• EPLD - Altera EPM 7064

• Interface - specific devices

• Control Processor – Intel 87C196KC

• Sensor Inputs

• Motor logic and drive

• EEPROM – 24C64

Control Processor

• 20 MHz clock

• High speed outputs for driving the paper motor and hammer firing

• High speed inputs for synchronizing timing of the shuttle position

• 8 channel 10 bit Analog to Digital Converter for sensor readings (paper

out,  paper motion, shuttle motion, ribbon motion, platen gap, hammer

current, power supply voltage, ambient temperature)

• Serial channel for communication (19.2K bps) with Main CPU

• Port control of Shuttle and Ribbon microcontroller

• Port control of control panel, and hammer loading

Sensor Inputs

• Paper motion – optical

• Paper out – optical

• Platen gap – Hall-effect

• Shuttle motion – optical

• Ambient temperature – thermistor

• Power supply voltage – resistor divider

• Ribbon motion - optical

• Ribbon weld detect - optical