Quantum Q250 Manuals

Manuals and User Guides for Quantum Q250. We have 1 Quantum Q250 manual available for free PDF download: Technical Reference Manual

Quantum Q250 Technical Reference Manual

Quantum Q250 Technical Reference Manual (79 pages)

Q200 Series Intelligent Disk Drives

Brand: Quantum | Category: Storage | Size: 3 MB

Table of Contents

Preface
3
Table of Contents
4
Features
8
- Logic Conventions
  9
- Principles of Operation
  10
Exploded View
10
- Disk Stack Assembly
  11
- Rotary Positioner Assembly (Actuator)
  11
- Headstack Assembly
  11
- Automatic Actuator Lock (AIRLOCK)
  11
- DC Drive Motor
  11
- Air Filtration
  12
Head Disk Assembly (HDA)
10
- Base Casting Assembly
  10
Inside View of Drive, Showing Air Filtration
12
Drive Electronics
13
- Disk Format
  13
- Simplified Explanation--Block Diagram
  13
Disk Format: Wedges, Sectors, and Tracks
14
Electronics Block Diagram
15
- SCSI Bus Physical Interface
  17
- SCSI Bus Signal Descriptions
  19
Typical Circuit of a Signal Line
19
SCSI Bus
20
- SCSI Bus Timing
  21
SCSI Bus Timing Diagram
22
- Power Requirements
  23
- Shorting Plug Options
  25
Drive Startup Current Profile
25
General PCB Layout; Plug, Terminator and
26
- Flex Circuit
  28
PCB Functional Elements
28
Servo AMC and ADC Circuit Waveforms
34
- Actuator Positioning Circuit
  36
- Read/Write Circuit
  36
Read Circuit Waveforms
37
- FYLO Timing Controller IC, and Xtal Oscillators
  38
- DICEY Data Controller IC
  39
DICEY Block Diagram
40
- Microprocessor and EPROM
  41
Power-Up Sequence/Recalibration
41
Read Command Sequence
42
Write Command Sequence
42
Power-Up Sequence
43
Read Command Sequence
44
Write Command Sequence
45
- PCB-7 Engineering Drawings
  46
Printed Circuit Board Parts Locations (PCB-7)
46
Schematic, PCB-7, Sheet
46
Printed Circuit Board Parts Locations (PCB-9)
46
Schematic, PCB-9, Sheet
46
- Applications
  59
Special Considerations
59
REQ/-ACK Handshake
60
Q250/Q280 Target Sends Data
60
- Hints for Software Driver Writers
  61
Buffer Full and Empty Ratios
61
Errors and Media Defects
63
- Errors
  63
- Allocating Replacement Sectors
  64
In-Line Sparing of Defective Sectors
65
In-Line Sparing Overflow of Defective Sectors
65
- Creating the Defect Lists
  66
Sparing of Field-Found Defective Sectors
66
- Updating the Drive Using the Defect Lists
  67
Grounding, Electrostatic Discharges, and EMI
68
- Maintenance
  69
Maintenance Precautions
69
Level 1 Maintenance
69
Level 2 Maintenance
70
Connector Maintenance
70
PCB Waveforms and Techniques
70
Section Parts Lists
77
Spare Parts List
77
Reference Parts List(S)
78

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