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CalComp Manuals
Floppy Disk Drive
142
Technical manual
CalComp 142 Technical Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Section Page
Introduction
Description
Physical and Electrical Characteristics
Special Tools and Test Equipment
2 Installation and Operation
Unpacking
Installation
Ac Power Cable
DC and Signal Cabling
Data Output Selection
Checkout
Operation
Floppy Disk Storage and Handling
Write-Protect Option
Floppy Disk Loading and Unloading
Data Recording Method
Peak Shift Precompensation
Track Accessing
Read Data Timing
Write Data Timing
Power-On to Data Transfer
3 Theory of Operation
Functional Areas
Control System
Disk Drive General Block Diagram
Positioning System
Read/Write System
Mechanical System
Drive Mechanism
Disk Centering Mechanism
Head Load Mechanism
Positioning Mechanism
Disk Centering and Head Load Mechanism
Positioning Mechanism
Logic Symbology and Definitions
Detailed Logic Description
Control Logic
Logic Symbology (Sheet 1 of 2)
Ramp Generator
Head Load Relay Driver
Read/Write Head Positioning Logic
Stepper Motor Position Control Simplified Logic Diagram
Stepper Motor Direction Sequencing
Read/Write Logic
Track 00 Detector Circuit
Write Channel, Simplified Logic Diagram
Raw Data Output Gating
VDC Regulator Description
One-Shot Data Decoders
Read Decoder with PLO Assembly
RAW and NRZ Read Data Decoder Waveforms
Read Decoder with PLO Block Diagram
Data Decoder Waveforms
Normal PLO Operation
Missing-Pulse PLO Operation
Sync-Up PLO Operation
Data Decoder
Read Sync
4 Maintenance
Preventive Maintenance
Monthly (Covers On)
Semiannually (Covers Removed)
Disk Drive Exerciser
Controls~ Indicators~ and Test Points
Preparation for Offline Checkout
Disconnecting the Exerciser
Maintenance Procedures
Tools and Test Equipment
Plugs and Jacks
PWB Assembly Data and Control
PWB Replacement
Power
Drive System
Position System
Read/Write System
Data Decoder with PLO Board Adjustments
5 Illustrated Parts Breakdown
Group Assembly Parts List
Part Number
Description
Quantity Per Assembly
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CalComp Model 140 & Model 142
Floppy Disk Drives
Technical Manual
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CalComp 1030
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