Shugart SA851 Manuals

Manuals and User Guides for Shugart SA851. We have 1 Shugart SA851 manual available for free PDF download: Service Manual

Shugart SA851 Service Manual (80 pages)

Bi-Compliant Double Sided Diskette Storage Drive

Brand: Shugart | Category: DC Drives | Size: 3 MB

Table of Contents
2
Theory of Operations
6
General Operations
6
Head Positioning
6
Diskette Drive Spindle
6
SA850/851 Functional Diagram
7
- Bi-Compliant Read/Write Head
  7
Read/Write Heads
7
Recording Format
8
Bit Cell
8
Byte
8
Recording Format (Double Density)
9
- Data Bytes
  9
Rules of Encoding
10
Tracks
11
Track Format
11
Sector Recording Format
11
Soft Sector Recording Format
11
Typical Track Index Format
11
- SA801 Sector Recording Format
  11
Data Address Mark FM
14
Deleted Data Address Mark FM
14
- MFM Index Address Mark
  15
MFM Data Address Mark
15
MFM Deleted Data Address Mark
16
MFM Index Pre Address Mark
16
- MFM Pre ID/Data Address Mark
  16
Address Mark FM
17
Track Accessing
18
Actuator Control Logic (Figure 21)
18
Power on Reset
18
Forward Seek
18
Reverse Seek
19
Track Zero Indicator
19
Activator Control Logic
20
Count
21
Read/Write Operations
22
Basic R/W Head
23
Recorded Bit
23
Reading a Bit
23
Read/Write Heads
24
F and 2F Recording Flux and Pulse Relationship
24
Read/Write Head
24
Write Circuit Functional Diagram
25
Read Circuit Functional Diagram
26
Read Circuit Operation (Figure 33)
26
Data Separation Timing Diagram
27
Interface
27
J1/P1 Connector
27
AC Power
27
DC Power
27
Output Lines
27
Interface Signal Driver/Receiver
29
Maintenance Section
30
Maintenance Features
30
Alignment Diskette
30
SA809 Exerciser
30
Special Tools
30
Diagnostic Techniques
30
Introduction
30
Solt Error" Detection and Correction
31
Write Error
31
Read Error
31
Seek Error
31
Test Points SA850/851
32
Connectors
32
J3/P3
33
J5/P5
34
2.7.6
34
3.0 Preventative Maintenance
34
3.1 Introduction
34
3.2 Preventive Maintenance Procedures
34
3.3 Cleanliness
35
3.4 Cautions
35
4.0 Removals, Adjustments
35
Motor Drive
35
Drive Motor Assembly: Removal and Installation
35
Motor Drive Pulley
35
Head Cover Shield Removal
35
Cartridge Guide Access
36
Sectorllndex LED Assembly: Removal and Installation
36
Write Protect Detector
36
Write Protect Detector: Removal and Installation
36
Write Protect Detector Adjustment
36
Head Load Mechanism Assembly
37
Head Load Mechanism: Removal and Installation
37
Head Load Mechanism Adjustment
37
Head Load Mechanism Adjustment
38
Head Load Timing
38
Index/Sector Photo Transistor Assembly
39
Index/Sector Photo Transistor Assembly: Removal and Installation
39
Index/Sector Adjustment
39
Spindle Assembly
39
Clamp Hub Removal
40
Cartridge Guide
40
Cartridge Guide Removal
40
Cartridge Guide Adjustment
40
Head Amplitude Check
41
Head Actuator Assembly: Removal and Installation
41
Head Penetration Tools
42
Head Penetration Adjustment
42
Dial Indicator
43
Penetration Plate Installation
44
Dial Indicator Installation
45
Installation Check
46
Correct Penetration
46
Penetration Adjustment
47
Head Radial Alignment
48
Read/Write Heads Azimuth Check
48
Head Radial Alignment
49
Motor Plate
49
Door Lock Solenoid and in Use LED Assembly Removal
49
Track 00 Detector: Removal and Installation
51
Track 00/76 Stop Adjustment
51
Track 00 Detector Assembly Adjustment
51
Flow Charts
52
Logic Diagrams
59
Physical Locations
64
Illustrated Parts Catalog
69
Schematic Diagrams
73

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Shugart SA851 Manuals

Shugart SA851 Service Manual (80 pages)

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