Table of Contents
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Figure
1-24
1-25
1-26
1-27
1-28
1-29
1-30
1-31
1-32
1-33
1-34
1-35
1-36
1-37
1-38
1-39
1-40
1-41
1-42
1-43
1-44
2-1
2-2
2-3
2-4
2-5
2-6
2-7
3-1
3-2
3-3
3-4
3-5
4-1
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
Tables
1-1
1-2
3-1
4-1
MFM Write Data Timing ...............................................................
1-23
MFM Read Data Timing ...............................................................
1-23
Head Switching Matrix ................................................................
1-24
Write CKT Block Diagram .. , ..........................................................
1-25
Write Enable Switch ...................................................................
1-26
Write Data Receiver and Switch .........................................................
1-27
Write Current Detector ................................................................
1-28
Read Channel Block Diagram ...........................................................
1-29
Read Droop and Droop Ignore .................... , .....................................
1-29
Read Channel Front End ...............................................................
1-30
1-31
Microprocessor Circuits Block Diagram ...................................................
1-32
Index Generation .....................................................................
1-33
Index Comparator ....................................................................
1-33
Index Separator ......................................................................
1-34
Timing Relationships Between Index Signals ...............................................
1-34
Reset One-Shot. ......................................................................
1-35
Normal Step Mode Timing .............................................................
1-35
Burst Step Mode Timing ...............................................................
1-36
Index Timing ........................................................................
1-37
General Control Timing Requirements ........... " .......................................
1-37
Power Interface Circuits ................................................................
2-3
Write Data Circuits ....................................................................
2-4
Read Data Circuits ............... " ....................................................
2-5
Actuator Driver Circuits ................................................................
2-6
Microprocessor Circuits .................................................................
2-7
Servo Burst and Index Circuits ...........................................................
2-8
Encoder PCB Circuits ..................................................................
2-9
Sample Track Format ...................................................................
3-3
Magnetic Induced EMI Error. ...........................................................
3-5
Current Flow Through Chassis ...........................................................
3-6
Ground Induced EMI Error .............................................................
3-6
Connecting Drive Ground to Chassis ......................................................
3-7
Connector Locations ...................................................................
4-4
Major Assemblies ...................................................................... 5 -2
Exploded Drive Assembly ............................................................... 5 -5
20-20816 ............................................ 5-6
Actuator Sub-Assembly ................................................................. 5 -7
Spindle and Disk Sub-Assembly ..........................................................
5-9
Head Arm Sub-Assembly ............................................................... 5-11
Cabinet Sub-Assembly ................................................................. 5-13
AC Drive Motor ......................................................................
5-15
DC Drive Motor Assembly ............................................................. 5-17
Bubble Sub-Assembly .................................................................
5-19
Encoder PCB Assembly ................................................................
5-21
Drive Control PCB Assembly ...........................................................
5-23
TABLES
D A Actuator Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............
1-14
Servo Bursts................................................................ .........
1-19
Write Pre-Compensation ................................................................
3-4
Voltage and Frequency Parts .............................................................
4-2
iv
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