Quantum Q250 User Manual

Name: Quantum Q250
Brand: Quantum
Rating: 5 (1 reviews)

79 pages

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Preface3
Table of Contents4
Features8
- Logic Conventions9
- Principles of Operation10
Exploded View10
- Disk Stack Assembly11
- Rotary Positioner Assembly (Actuator)11
- Headstack Assembly11
- Automatic Actuator Lock (AIRLOCK)11
- DC Drive Motor11
- Air Filtration12
Head Disk Assembly (HDA)10
- Base Casting Assembly10
Inside View of Drive, Showing Air Filtration12
Drive Electronics13
- Disk Format13
- Simplified Explanation--Block Diagram13
Disk Format: Wedges, Sectors, and Tracks14
Electronics Block Diagram15
- SCSI Bus Physical Interface17
- SCSI Bus Signal Descriptions19
Typical Circuit of a Signal Line19
SCSI Bus20
- SCSI Bus Timing21
SCSI Bus Timing Diagram22
- Power Requirements23
- Shorting Plug Options25
Drive Startup Current Profile25
General PCB Layout; Plug, Terminator and26
- Flex Circuit28
PCB Functional Elements28
- Power-On-Reset (POR) and Warm Reset28
- Motor Control Circuit29
- Electronic Return Spring30
- S080 SCSI Bus Controller30
- Servo Control, AMC and Servo AGC32
Servo AMC and ADC Circuit Waveforms34
- Actuator Positioning Circuit36
- Read/Write Circuit36
Read Circuit Waveforms37
- FYLO Timing Controller IC, and Xtal Oscillators38
- DICEY Data Controller IC39
DICEY Block Diagram40
- Microprocessor and EPROM41
Power-Up Sequence/Recalibration41
Read Command Sequence42
Write Command Sequence42
Power-Up Sequence43
Read Command Sequence44
Write Command Sequence45
- PCB-7 Engineering Drawings46
Printed Circuit Board Parts Locations (PCB-7)46
Schematic, PCB-7, Sheet46
Printed Circuit Board Parts Locations (PCB-9)46
Schematic, PCB-9, Sheet46
- Applications59
Special Considerations59
REQ/-ACK Handshake60
Q250/Q280 Target Sends Data60
- Hints for Software Driver Writers61
Buffer Full and Empty Ratios61
Errors and Media Defects63
- Errors63
- Allocating Replacement Sectors64
In-Line Sparing of Defective Sectors65
In-Line Sparing Overflow of Defective Sectors65
- Creating the Defect Lists66
Sparing of Field-Found Defective Sectors66
- Updating the Drive Using the Defect Lists67
Grounding, Electrostatic Discharges, and EMI68
- Maintenance69
Maintenance Precautions69
Level 1 Maintenance69
Level 2 Maintenance70
Connector Maintenance70
PCB Waveforms and Techniques70
- Special Test Equipment70
- Techniques and Waveform Descriptions71
- 5.5.3 Test Connector J5 Signals72
Section Parts Lists77
Spare Parts List77
Reference Parts List(S)78

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Quantum Q250 Specifications

General

Brand	Quantum
Model	Q250
Category	Storage
Language	English

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