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Q2080
Product description
Quantum Q2080 Product Description
8" media fixed disk drive
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Contents
Table of Contents
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Table of Contents
Table of Contents
Section I - PRINCIPLES of OPERATION
Model Q2080 Block Diagram
Model Q2080 Drive Mechanism
Drive Mechanism Block Diagram
Optical Encoder
Rotary Positioner Assembly
Head Stack Assembly
Model Q2080 Mechanical Layout
Disk Stack Assembly
Base Casting Assembly
Acdrivemotor
DC Drive Motor
Air Filtration
DC Drive Motor Current Profile
Automatic Actuator Lock
Air Filtration System
Model Q2080 Drive Electronics
General Features
Drive Electronics Block Diagram
Encoder Board
Encoder PCB
Encoder PCB Block Diagram
Drive Control Board
Drive Control PCBA Block Diagram
AGC Circuit
Simplified AGC Circuit
PI and P2 Generation
Coarse Seek Positioning
Actuator Current During Seek
Actuator Drive Circuits
Angular Positioning: PI Vs. P2
Actuator Drive Block Diagram
Actuator Enable Driver
Actuator Compensator
Actuator Drive Circuits
Servo Read and Conversion Circuits
Actuator Drive Circuit Voltage/Current Relationship
Servo Bursts
Servo Wedges
Servo Circuitry Block Diagram
Servo Read Amp and Filter Circuits
Servo Peak Detector
Servo AID Conversion
AID Reset
Data Interface
MFM Write Data Timing
MFM Read Data Timing
Head Switching Matrix
Write Data Circuits
Write CKT Block Diagram
Write Enable Switch
Write Data Receiver and Switch
Read Data Circuits
Write Current Detector
Read Channel Block Diagram
Read Droop and Droop Ignore
Read Channel Front End
Microprocessor Circuits
Index Generation
Microprocessor Circuits Block Diagram
Index Generation
Index Comparator
Index Separator
Timing Relationships between Index Signals
Control Signal Interface
Reset One-Shot
Normal Step Mode Timing
Burst Step Mode Timing
Index Timing
General Control Timing Requirements
Interface and Drive Select Logic
Power on Reset
DC Power Filter and Regulators
Section II - LOGIC CONVENTIONS and CIRCUIT DIAGRAMS
General Discussion
Logic Symbology
Component Locations
Circuit Diagrams
Power Interface Circuits
Write Data Circuits
Read Data Circuits
Actuator Driver Circuits
Microprocessor Circuits
Servo Burst and Index Circuits
Section III - APPLICATIONS
Introduction
Power on Recalibration Sequence
Interface
Errors and Media Defects
Errors
Defect Detection and Reporting
Media Quality Criteria
Self Diagnostics
Track Formatting
Introduction
Track Format
Sample Track Format
Write Pre-Compensation
Magnetic Coupling
Magnetic Induced EMI Error
Ground Current Coupling
Current Flow through Chassis
Ground Induced EMI Error
Connecting Drive Ground to Chassis
Maintenance
General Information
Maintenance Precautions
Preventive Maintenance
Maintenance Procedures
Level 1 Maintenance
Voltage and Frequency Parts
Connector Locations
Level 2 Maintenance
Illustrated Parts Breakdown
General Discussion
Major Assemblies
Sub-Assemblies
Printed Circuit Boards
Drive Control PCB
Encoder PCB Circuits
Major Assemblies
Exploded Drive Assembly
Power Op Amp Assembly Part Number 20-20816
Actuator Sub-Assembly
Spindle and Disk Sub-Assembly
Head Arm Sub-Assembly
Cabinet Sub-Assembly
AC Drive Motor
DC Drive Motor Assembly
Bubble Sub-Assembly
Encoder PCB Assembly
Drive Control PCB Assembly
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OUAmUID
PRODUCT
DESCRIPTION
TECHNICAL REFERENCE MANUAL
Q2080
8" Media Fixed Disk Drive
Table of
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