Tally T6215, Maintenance Manual

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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