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Printer
704
Technical manual
Centronics 704 Technical Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
8080A Microprocessor Pin Designations
MPU Block Diagram
MPU Status Word
Control Character Interrupt Routine
Flow Charts
Bus Structure
Bus Structure Block Diagram
Detailed Description
I/O Bus Transfers
System Timing
Serial Communications
Input Data
Data Bus Assignments (Baud Rate Commands)
Control Characters
Firmware Response
Control Codese
Mri and Device Select Decoding
3.7.1 Device Select
Control Panel/Mpu Communications
Control Panel Status Word
Printer Mechanism Operation
3.10.2 Vidint Generation
Exploded Section of Timing Fence
Video Amplifier Simplified Schematic
Video Edge Detector Circuit/Timing
Character Generation
Miscellaneous Operations
3211-3 Motor Control
Stepper Motor Operation
Basic Stepping Motor Operation
Stepper Motor Drive Circuit
Power Distribution
Printer Initialization
Main Program Monitoring Loop
Print Routine
Video Interrupt Routine
Carriage Drive Interrupt Routine
Paper Drive Interrupt Routine
Control Character Interrupt Routine
Centronics Nameplate
Recommended Tools
Penetration Adjustment (Print Head Assembly). 5=2
Carriage Actuator Arms Adjustment
Main Drive Belt Adjustment
Main Drive Belt Adjustment
Paper Feed Timing Belt Adjustment
Platen Adjustment
Tractor Drive Timing Belt Tension
Paper Tension Adjustment
Optical Pickup/Timing Fence Alignment
Optical Pickup, Vertical Alignment
Duty Cycle and Phase Adjustment of Video
Removal/Replacement
Cover Assemblies
Carriage Assembly
Print Head Assembly
Power Driver Board Assembly
Timing Fence Assembly
Video Amplifier Assembly
Ribbon Cartridge Assembly
Stepper Motor Assembly, Carriage Drive
Stepper Motor Assembly, Paper Drive
Primary Voltage Assembly
Fan Assembly
Logic Board Assembly
Control Panel Assembly
Functional Schematics
7=3 Device Select
Control Panel/Mpu
VFU Reader/Mpu. CG/STM/CRM/MPU
Schematic Diagrams
Logic Board
Power Driver Board
Video Amplifier Board
Memory Map
VFU Reader/Mpu COMMUNICATIONS
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AUG 1979
Ta Re mm Rad SebOo Mee SOT me tte eee
TECHINIGAL
MANUAL
Pens ecient ee
nF nee
etn
eee vat
CENTRONICS'
data computer corporation
Hudson, New Hampshire 03051
Telephone
(603) 883-0111
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