Ampex DFR900 User manual

' •.

DFR900 SERIES
DISK STORAGE DRIVE
OPERATION
AND MAINTENANCE MANUAL
3311546-01
AUGUST 1980
THE INFORMATION IN THIS MANUAL IS PROPRIETARY, AND IS NOT TO BE
REPRODUCED OR DISSEMINATED IN ANY FORM WITHOUT PRIOR WRITTEN
CONSENT OF AMPEX MEMORY PRODUCTS DIVISION.

LIST OF EFFECTIVE PAGES
Title Original
AOriginal
BBlank Original
ithru
ix Original
xBlank Original
1-1 thru
1-13 Original
1-14 Blank Original
2-1 thru
2-29 Original
2-30 Blank Original
3-1 thru
3-140 Original
4-1 thru
4-44 Original
5-1 thru
5-27 Original
5-28 Blank Original
6-1 thru
6-8 Original
Schematic Diagrams Original
A

TABLE OF CONTENTS
SECTION PAGE
GENERAL INFORMATION. ................................................... 1-1
1-1.
1-2.
1-5.
1-9.
1-10.
1-20.
General Description .
Features .
1-3. Key Features .
1-4. Other Features .
Customer-Selectable Characteristics .
1-6. Power Source .
1-7. Sector Versions .
1-8. ID Plugs .
Interface Capability .
Major Components .
1-11 .Electronics .
1-12. Power Supply .
1-13. Upper Positioning Assembly .
1-14. Sealed Fixed-Disk Module .
1-15. Spindle Drive Motor .
1-16. Air Supply and Filtering .
1
-1 7. Deck Plate .
1-18. Main Frame .
1
-1 9. Operator Control Panel .
Specifications
and Performance Characteristics .
1-21. Basic Specifications .
1-22. Environmental Limits (Operating) .
1-23. Environmental Limits (Shipping/Storage) .
1-24. Power Requirements .
1-25. Physical Characteristics .
1-26. Performance Characteristics .
1-27. Recoverable Data Errors .
1-28. Non-Recoverable Errors .
1-29. Seek Errors .
1-30. Cartridge .
1-31. Reliability .
1-32. Product Life .
1-33. Serviceability .
1-34. Preventive Maintenance .
1-35. Media Alignment .
1-36. Installation .
1-1
1-1
1-1
1-1
1-2
1-2
1-3
1-3
1-3
1-3
1-3
1-3
1-3
1-5
1-5
1-5
1-5
1-5
1-5
1-5
1-6
1-9
1-9
1-9
1-10
1-10
1-10
1-10
1-10
1-10
1-11
1-12
1-12
1-12
1-12
1-12
II
INSTALLATION AND OPERATION. ............................................. 2-1
2-1.
2-2.
2-3.
Scope .
Unpacking .
Installation and Checkout .
2-4. Space Allocation .
2-5. Height .
2-6.
Rear Clearance .
2-7. Installation Procedure .
2-8. Initial Checkout Procedure .
2-9. Cabling .
2-1
2-1
2-1
2-1
2-1
2-1
2-1
2-6
2-10

SECTION
III
ii
TABLE OF CONTENTS (Continued)
PAGE
2-10. Star and Daisy-Chain Cabling. ............................. 2-10
2-11. Notes on Cabling. ...................................... 2-14
2-12. Grounding................................................... 2-14
2-13. DC Ground............................................ 2-14
2-14. Frame Ground. ......................................... 2-14
2-15. Sector Number Selection. ................. .. .................... 2-15
2-16. Model Selection............................................... 2-15
2-17. Operation........................................................... 2-15
2-18. Operator Controls and Indicators. ................................. 2-15
2-19. Start/StopSwitch 2-15
2-20. Transition Indicator. ..................................... 2-15
2-21. Readylndicators 2-15
2-22. Write Protect. .......................................... 2-20
2-23. Cartridge-Missing Indicator. ............................... 2-20
2-24. Fault Indicator. ......................................... 2-20
2-25. Address ID Plug. ....................................... 2-21
2-26.
Disk Cartridge Access Door Latch. ......................... 2-21
2-27. Operating Instructions. ......................................... 2-21
2-28.
Power-Up............................................. 2-21
2-29.
Start................................................. 2-22
2-30. Write Protect. .......................................... 2-22
2-31. Stop................................................. 2-22
2-32. Power-Down ,......... 2-22
2-33. Remote Power Sequence. ................................ 2-22
2-34. Fault Operating Instructions. . . . . . .. ....................... 2-22
2-35. Disk Cartridge Handling and Storage. ....................... 2-23
2-36. Disk Cartridge Installation. ................................ 2-23
2-37. Disk Cartridge Removal. ................................. 2-23
2-38. Power Failure or Emergency Stop Cartridge Removal. . . . . . . . . . . 2-25
2-39. Maintenance Switches and Indicators. ........................... .. 2-25
2-40. Power Supply Indicators. ................................. 2-27
2-41. PRC (Processor) Board Switches ........................... 2-29
THEORY OF OPERATION. .................................................... 3-1
3-1. Introduction. ........................................................ 3-1
3-2. System Operation. ...................... .. ........................... 3-1
3-3. Input/Output (I/O) Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3-4. Cabling. ..................................................... 3-2
3-5. Transmitters
and Receivers. ............................... 3-2
3-6. Terminators.. .......................................... 3-2
3-7.
Signal Cables ........................................ .. 3-2
3-8.
Signal Cable Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-4
3-9. Signal Lines. ................................................. 3-6
3-10. Address
and Control Tag Lines. ........................... 3-6
3-11. Individual Lines. ........................................
3-10
3-1 2. Data and Clock Lines. ................................... 3-1 5
3-13.
Data Format and Data Control Timing ................... 3-16
3-1 4. Write Format Procedure. ................................. 3-1 9
3-15. Control
Timing. ....................... .. ............... 3-19
3-16. Major Assemblies. ................................................... 3-21

SECTION
TABLE OF CONTENTS (Continued)
PAGE
3-17. Printed Circuit Board Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 21
3-18. Disk Module Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-19. Spindle Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-20. Fixed-Disk Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-25
3-21. Head Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-22. Rotary Actuator Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-23. Air Filters. ............................................. 3-25
3-24. Motor Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-25. Brake Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
3-26. Linear Motor and Carriage Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
3-27. Velocity Tachometer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-27
3-28. Idler Assembly. ............................................... 3-27
3-29. Power Supply Assembly ........................................ 3-27
3-30. Auxiliary Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27
3-31. Input Rectifier and Filter. ................................. 3-27
3-32. Surge Current Suppressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
3-33. Clock Pulse Oscillator. ................................... 3-30
3-34. Voltage-Sense Amplifier and Pulse-Width Converter. ........... 3-30
3-35. Driver Circuit. .......................................... 3-30
3-36. Power Switching. ....................................... 3-32
3-37. Output Current Sensing. ................................. 3-32
3-38. Overcurrent Protection. .................................. 3-32
3-39. Power-On Sequence. .................................... 3-32
3-40. Overvoltage Protection. .................................. 3-34
3-41. Momentary Power Failure Sensing Circuit. . . . . . . . . . . . . . . . . . . . 3-34
3-42. Remote-Off............................................ 3-34
3-43. Status Display. ......................................... 3-34
3-44. Functional Operations. ................................................ 3-38
3-45. Airflow...................................................... 3-38
3-46. Microprocessor Control Functions. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 3-38
3-47. Microprocessor Hardware. ................................ 3-38
3-48. Memory Address Assignments. ............................ 3-43
3-49. Program Interrupts. ........... .. . . . . . . . . . . . . . . . . . . . . . . . . 3-43
3-50. Input/Output Ports. ..................................... 3-45
3-51. Microprocessor Operational Flow Charts. ........................... 3-64
3-52. Power-Up Sequence. .................................... 3-67
3-53. Spindle Motor Start Sequence. ............................ 3-70
3-54. First Seek Lower ; . . . . . . . . . . 3-70
3-55. First Seek Upper.. .. . .. . . .. . .. .. .. .. . . . ... . . . .. . 3-74
3-56. Gain Select Lower ...................................... 3-74
3-57. Gain Select Upper ...................................... 3-74
3-58. Main Loop. .................... .. ..................... 3-79
3-59. Status Checks. ......................................... 3-79
3-60. Power-Down Sequence. ................................. 3-79
3-61. Spindle Motor Stop Sequence. ............................ 3-87
3-62.
Error Disposal. ................. .. ...................... 3-87
3-63.
Seek Interrupt. .............................. .. . . . . . . . . . 3-87
3-64. Command Interrupt. ..................................... 3-87
3-65.
Seek Command. ....................................... 3-96
3-66. RTZ Lower Command ................................... 3-96
3-67. RTZ Upper Command .. ................................. 3-96
iii

SECTION
TABLE OF CONTENTS (Continued)
PAGE
3~68. Start/Stop Operations .
3-69. Spindle Start .
3-70. Sequential Start-Up, Daisy-Chain Configuration .
3-71 .Spindle Rotation Time Check .
3-72. Spindle Stop .
3-73. Door Latch Unlocking , .
3-7 4. Seek Operation .
3-75. General .
3-76. Basic Servo Operation .
3- 77 . Seek Operation Sequence .
3-78. Servo Data .
3-79. Seek Signal Descriptions .
3-80. Track Servo Signal
(TSS) .
3-81. End of Travel (Guardband) .
3-82. Cylinder Pulse .
3-83. Velocity .
3-84. On Cylinder .
3-85. SPIN-DL .
3-86. Sync Data .
3-87. Desired Velocity .
3-88. Power Off .
3-89. Dibit , .
3-90. Read/Write Operations .
3-91. Write Operation .
3-92. Read Operation .
3-96
3-96
3-101
3-101
3-101
3-103
3-103
3-103
3-103
3-103
3-105
3-109
3-109
3-110
3-110
3-111
3-111
3-116
3-116
3-116
3-116
3-116
3-116
3-124
3-127
IV
iv
MAl NTENANCE ............................................................ 4-1
4-1. Introduction. ........................................................ 4-1
4-2. Maintenance Precautions. .............................................. 4-1
4-3. Safety Precautions. ............................................ 4-1
4-4. Equipment Precautions. ......................................... 4-1
4-5. Maintenance Tools
and Expendables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4-6. Maintenance Intervals. ................................................ 4-1
4-7. Preventive Maintenance. ...............................................
4-3
4-8. Makeup Filter Cleaning 4-3
4-9. Prefilter Cleaning. ............................................. 4-3
4-10. First Filter Removal and Installation. ............................... 4-3
4-11. Data Head and Servo Head Cleaning. ............................. 4-5
4-12. Cleaning of R-Carriage Rails and Bearings. .......................... 4-5
4-13. Corrective Maintenance. ............................................... 4-7
4-14. Top Cover Removal and Installation ............................... 4-7
4-15. Bottom Cover Removal and Installation ; . . . . . . . . . . . 4-7
4-16.
Data Head Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4-17. Servo Head Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-9
4-18. Module Removal and Installation. ................................. 4-10
4-19. Brake Assembly Removal and Installation. .......................... 4-12
4-20. Motor Assembly Removal and Installation. .......................... 4-14
4-21. Idler Assembly Removal and Installation. ........................... 4-14
4-22. Spring Earth Assembly Removal and Installation. ..................... 4-15
4-23. Card Cage Assembly Removal and Installation. ...................... 4-15

SECTION
v
VI
TABLE OF· CONTENTS (Continued)
PAGE
4-24. Power Supply Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . .. . . 4-16
4-25. Fan Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
4-26. Pulley Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
4-2 7. R-Carriage Assembly Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . 4- 20
4-28. R-Carriage Load Rail and Fixed Rail Removal and Installation. ........... 4-22
4-29. R-Carriage Main Rail Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . 4-22
4-30. Velocity Sensor Assembly Removal and Installation. . . . . . . . . . . . . . . . . . . 4-23
4-31. Sensor Rod Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
4-32. Linear Motor Magnet and Coil Removal and Installation. . . . . . . . . . . . . . . . 4-24
4-33. Solenoid Assembly Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . 4-25
4-34. PCB-FTP Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
4-35. PCB-PAU Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
4-36 .. PCB PAL Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
4-37. Relay Assembly Removal and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
4-38. Drive Tests and Adjustments. ........................................... 4-28
4-39. Head Alignment. .............................................. 4-28
4-40. Precautions............................................ 4-29
4-41. CE Cartridge. ........................................ .. 4-29
4-42. Head Alignment Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-29
4-43. PCB Adjustment. ............................................ .. 4-34
4-44. Confirmation Test After PCB Replacement. .......................... 4-34
4-45. Confirmation Test After Power Supply Replacement. . . . . . . . . . . . . . . . . . . 4-35
4-46. Confirmation Test After Head Replacement. ......................... 4-36
4-47. Confirmation Test After Module Replacement. ....................... 4-36
4-48. Manual Head Loading. ......................................... 4-36
4-49. Read/Write Adjustments ........................................ 4-37
4-50. Servo Upper Adjustment. ....................................... 4-38
4-51. Servo Lower Adjustment. ....................................... 4-39
4-52. Maintenance Aids. ................................................... 4-40
4-53. Maintenance Switches and Indicators. ............................. 4-40
4-54. Operator Indicators ............................................ 4-44
4-55. Power Supply Indicators. ....................................... 4-44
PARTS LIST ............................................................... 5-1
5-1 .General. ........................................................... 5-1
MAINTENANCE DRAWINGS. ................................................. 6-1
6-1 .Introduction. ........................................................ 6-1
6-2. List of Drawings. .................................................... 6-1
6-3. Interconnection Symbology. ............................................ 6-2
6-4.
General Abbreviations. ..................................... .. . . . . . . . . . 6-2
6-5. Signal Annotation. ................................................... 6-2
6-6. Functional Symbology. ................................................
6-4
6-7. Signal Name. ....................................................... 6-5
6-8. Digital Integrated Circuits. ............................................. 6-6
v

FIGURE
1-1
1-2
1-3
1-4
1-5
1-6
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
vi
LIST OF ILLUSTRATIONS
DFR Configuration .. , .
Major Components .
Head Number for SMD Interface .
Head Number for Independent Seek .
Disk Cartridge .
Fixed and Removable Modules .
Dimensional View .
Detail Dimensions .
Bracket
and Rack in Rear Side Fitting .
Rail and Bracket in Rear Side Fitting .
Fore Side Fitting .
Rail and Unit. .
Rail and Unit Sectional View .
Rail Bracket Detail. Side View .
Rail Bracket Detail, Sectional View .
Front
Panel .
Upper Carriage Stopper .
Lower Carriage Stopper .
100 V/1 20 VPower AC Cable .
230 VAC Power Cable .
Read/Write and Control Cable Connectors .
Star Cable Configuration .
Daisy-Chain Configuration .
DC and Frame Grounds .
Sector Number Selection .
Model Selection .
Operator Controls and Indicators .
Disk Cartridge Installation
and Removal .
Maintenance Switches and Indicators .
Rear Power Supply Indicators .
Typical Ribbon-Cable Control or Status Transmission
Line .
Typical Ribbon-Cable Data or Clock Transmission Line .
Tag and Bus Timing .
Typical Timing with Address Mark .
Index
and Sector Timing .
SVU Board Jumper Pins .
Open Cable Detect Circuit .
Logic Number Select Code
and Timing Diagram .
Write
Data and Servo Clock Timing .
Read Data Timing .
Fixed-Sector Format .
Variable-Sector Format .
Control Timing .
Functional Block Diagram .
Major Assemblies .
Power Supply Block Diagram .
Auxiliary Power Supply .
Input Rectifier
and Filter .
Surge Current Suppressor .
PAGE
1-2
1-4
1-7
1-7
1-11
1-13
2-2
2-3
2-4
2-4
2-5
2-5
2-6
2-7
2-8
2-8
2-9
2-9
2-11
2-11
2-12
2-13
2-13
2-14
2-16
2-17
2-21
2-24
2-27
2-29
3-5
3-5
3-7
3-9
3-11
3-12
3-14
3-15
3-16
3-16
3-17
3-18
3-20
3-22
3-26
3-28
3-29
3-30
3-31

LIST OF ILLUSTRATIONS (Continued)
FIGURE
PAGE
3-20
3-21
3-22
3-23
3-24
3-25
3-26
3-27
3-28
3-29
3-30
3-31
3-32
3-33
3-34
3-35
3-36
3-37
3-38
3-39
3-40
3-41
3-42
3-43
3-44
3-45
3-46
3-47
3-48
3-49
3-50
3-51
3-52
3-53
3-54
3-55
3-56
3-57
3-58
3-59
3-60
3-61
3-62
3-63
3-64
3-65
3~66
3-67
3-68
3-69
3-70
Oscillator. .
Voltage-Sense Amplifier
and Pulse-Width Converter .
Driver Circuit .
Power-Switching Transistors and High-Frequency Transformer .
Output Rectifier
and Filter and Current-Sensing Resistor .
Overcurrent Protection .
Overvoltage Protection .
Initial Dead-Time Action, Line Disturbance,
and Remote-Off .
Airflow .
Block Diagram of Microprocessor Control Logic .
Difference Down-Counter .
General Flow Chart .
Power-Up Sequence .
Spindle Motor Start Sequence .
First
Seek Lower .
First
Seek Upper .
Gain Select Lower ' .
Gain Select Upper .
Main Loop ; .
Status Check .
Check Unit Status .
Power-Down Sequence .
Spindle Motor Stop Sequence .
Head Retract. .
Error Disposal .
Timer Interrupt ' .
Seek Interrupt (SMD Mode Only) .
Command Interrupt ' .
Seek Command Service (SMD Mode Only) .. ; .
RTZ Lower Command Service .
RTZ Upper Command Service .
Offset Command Service .
Power Sequencing, Simplified Diagram .
Power Sequence Timing .
Control Blocks
of Long-Seek Operation (U-Unit) .
U-Unit Servo Data .
U-Unit Servo Data
Read Waveforms .
L-Unit Index Servo Data .
L-Unit Servo Data
Read Waveforms .
On-Cylinder
and Reset Pulse Detection Logic (U-Unit) .
End-of-Travel Detection Logic .
Cylinder
Pulse Detection Logic (U-Unit) .
Cylinder
Pulse Detection Logic (L-Unit) .
On-Cylinder Detection Logic (L-Unit) .
A-Velocity Detecting Logic on L-Unit. .
Dibit Detection Logic .
U-Unit Index Decode Time Chart .
Peak Detector Sample Window Preparation Logic (U-Unit) .
L-Side Servo Decode Timing Chart .
SVU Block Diagram .
SVL Block Diagram .
3-31
3-32
3-33
3-34
3-35
3-36
3-36
3-37
3-39
3-40
3-42
3-66
3-68
3-71
3-72
3-75
3-77
3-78
3-80
3-81
3-84
3-85
3-88
3-89
3-90
3-92
3-93
3-95
3-97
3-98
3-100
3-101
3-102
3-102
3-104
3-106
3-106
3-108
3-108
3-111
3-112
3-113
3-114
3-114
3-115
3-117
3-118
3-119
3-120
3-121
3-122
vii

LIST OF ILLUSTRATIONS (Continued)
FIGURE
3-71 PAU, PAL Block Diagram .
3-72 DTC Block Diagram .
3-73
Flux Inversions .
3-74 NRZ/M
FM Encoder, Write Compensator .
3-75 NRZ/MFM Encoder, Write Compensator Timing Chart .
3-76 NRZ/MFM Encoder Write Compensator Details Timing Chart .
3-77 Flexible PWB in Lower Module .
3-78 PAU (Reference) , .
3-79 PAL Amplifier .
3-80 Pulser .
3-81
Pulser Timing Chart .
3-82 AM Detector .
3-83 AM Detector Timing Chart .
3-84 Read PLO, MFM/NRZ Demodulator .
3-85 Read PLO, MFM/NRZ Demodulator Timing Chart .
4-1 Makeup Filter Cleaning, Prefilter Cleaning,
and First Filter Removal and Installation .
4-2 Cleaning of R-Carriage Rails and Bearings .
4-3 Bottom Cover Removal and Installation .
4-4 Head Removal and Installation .
4-5 Module Removal and Installation .
4-6 Brake and Motor Assembly .
4-7 Idler Assembly Removal and Installation .
4-8 Spring Earth Assembly Removal and Installation .
4-9 Card Cage Assembly Removal and Installation .
4-10 Fan and Power Supply Removal and Installation .
4-11 R-Carriage Assembly, Velocity Sensor Assembly, Sensor Rod,and Linear Motor Magnet
and Coil Removal and Installation ., .
4-12 Head Moving Cam Installation .
4-13 Solenoid Assembly and PCB-FTP Removal and Installation .
4-14 Relay Removal and Installation .
4-15 Head Alignment .
4-1 6
CE Cartridge, Data Surface Layout .
4-17 On-Track Condition .
5-1 Complete Assembly, View One .
5-2 Complete Assembly, View Two .
5-3 Deck Assembly .
5-4 Side Frame, Left and Right Assemblies .
5-5
VCM Cable Assembly .
5-6
Receiver Assembly .
5-7 Front Door, Front
Panel. and Control Panel Assemblies .
5-8
Rear Panel Assembly and Card Cage Assembly .
5-9 First Filter Assembly .
6-1 Interconnecting Signal Symbology .
viii
PAGE
3-125
3-126
3-127
3-128
3-129
3-130
3-131
3-132
3-134
3-135
3-136
3-137
3-138
3-139
3-140
4-4
4-6
4-7
4-8
4-11
4-13
4-15
4-16
(
4-17
4-18
4-21
4-24
4-26
4-28
4-30
4-31
4-33
5-2
5-6
5-10
5-14
5-16
5-18
5-22
5-24
5-26
6-3

TABLE
1-1
2-1
2-2
2-3
2-4
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
4-2
4-3
4-4
4-5
4-6
6-1
LIST OF TABLES
Power Requirements .
Sector Jumpering Assignments .
Maintenance Indicators .
Maintenance Switches .
Detailed Status Bit Indications .
Control Cable Signal Definitions (Ribbon
Type) .
Read/Write Cable Signal Definitions (Ribbon Type) .
Bus/Tag Decode Functions .
Input Port .
Output Port .
Input Port Functions .
Output Port Functions .
Maintenance Tools and Expendables .
Maintenance Intervals .
Maintenance Switches .
Maintenance Indicators .
Error Status Definitions .
Operator Indicator Error Status During First
Seek .
List of Drawings .
PAGE
1-10
2-18
2-26
2-26
2-28
3-3
3-4
3-6
3-46
3-47
3-49
3-57
4-2
4-2
4-41
4-41
4-42
4-44
6-1
ix

~~~~---~~~----------'----' -----------'
SECTION I
GENERAL INFORMATION

SECTION I
GENERAL
INFORMATION
1·1. GENERAL DESC,RIPTION
The DFR-900 family of disk drives are versatile, rack-mountable, high-performance, high-reliability, dual-actuator, mass-
memory devices with
32-to-96 MBytes storage capacity. The drives have avery-fast-average access time of 30 ms and a
data transfer rate of
9.677 Mbits per second. The drives feature acartridge of 16M Bytes capacity and asealed fixed-disk
module, including 1,2, or3disks with
16 MBytes, 48 MBytes,and 80 MBytes capacity, respectively. Three basic models
are available
as explained below.
Model No.
DFR-932
DFR-948
DFR-996
1-2. FEATURES
Number of
Cartridge Disks Number of Fixed Disks
1
2
3
Total Capacity
(M Bytes)
32
64
96
The following are standard features of the DFR-900 series disk drive.
1-3. Key Features
•High reliability (Winchester technology for fixed disks)
•High maintainability (no scheduled maintenance for fixed disks)
•Disk cartridge compatible with CDC 9448 (CDC 91204 Data Cartridge, or equivalent-cartridge not included)
•
Two independent actuators (see figure 1-1):
One positioner accesses the removable cartridge media (single linear motor)
One positioner accesses the fixed media (single swing arm/rotary)
•Family concept which covers
32 to 96 MBytes
1-4. Other Features
•SMD/CMD interface compatibility
•Control logic implemented by microprocessor
•Off-line diagnostic capability
•Hard-sectoring capability (4
to 128)
•Address Mark generation and detection
•Daisy-chain cable system
•Tracking offset and data strobe offset
•Internal power supply
1-1

~16,48,80MB Sealed, Fixed Media
(head /disk assembly)
SMD/CMD
32 to 96 MBytes
(U) ACTUATOR----~ .. --
INDEPENDENT SEEK
CARTRIDGE
ACTUATOR
FIGURE 1·1. DFR CONFIGURATION
•Transfer rate of 9.677 Mbits/sec
•
LED status indicators for malfunction diagnosis
1-5. CUSTOMER-SELECTABLE CHARACTERISTICS
The following characteristics are selectable by the customer at order time.
1-6. Power Source
Available power source versions are:
100 VAC, 50 Hz, 1¢
100 VAC, 60 Hz, 1¢
120 VAC, 60 Hz, 1¢
230 VAC, 50 Hz, 1¢
1·2

1-7. Sector Versions
The sector versions are jumper-selectable, permitting the following equal capacity sectors per revolution:
4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 32, 35, 40, 42, 48, 56,
60, 64, 70, 80, 84, 96, 105, 112, 120,
and 128
NOTE
Other sectors per revolution (not listed above) are available with the
last sector smaller than the accompanying sectors.
1-8. 10 Plugs
10 plugs are available as specified below:
10 plug number 0
10 plug number 1
10 plug number 2
10 plug number 3
10 plug number 4
10 plug number 5
10 plug number 6
10 plug number 7
1-9. INTERFACE CAPABILITY
Two drive interfaces are available: the SMO/CMO interface and the independent seek interface. With independent seek, the
drive appears much like
two independent drives, referred to as the upper device and the lower device. This permits
independentlyseeking the
two sections ofthe drives to different cylinders, ifdesired. Each interface requires adifferentset'of
interface and microprocessor
PCBA's.
1-10. MAJOR COMPONENTS
The OFR-900 series drive's major components are illustrated in figure 1-2 and are explained in the following paragraphs.
1-11. Electronics
The majority of logic consists of low-power schottky and TTL integrated circuits. The logic circuits are mounted on six
PCBA's which plug into amother board.
1-12. Power Supply
The drive incorporates an internal, switching-type power supply.
1·13.
Upper Positioning Assembly
The upper positioning assemblyconsists of acarriage on which read/write and servo heads are mounted, rails on whichthe
carriage rides, and avoice-coil linear motor which moves the carriage, utilizing positioning information from adedicated
servo surface.
1·3

DC POWER SUPPLY
SPINDLE DRIVE
MOTOR
AND BRAKE
SEALED, FIXED MEDIA
(HEAD/DISK ASSEMBLY)
AND IMPELLER
SPINDLE
0-0961A
(
\
1-4
FIGURE 1-2. MAJOR COMPONENTS

1-14.
Sealed Fixed-Disk Module
This module is completely sealed, including arigid aluminum-cast deck plate, precision spindle, 3340-type disk(s), 3340-
type read/write and servo heads, rotary arm actuator, and two airfilters. This module is field-removable from the main deck
plate via five bolts. An internal rotary-arm-type carriage
is driven by arotary actuatorutilizing positioning information from a
dedicated servo surface.
1-15. Spindle Drive
Motor
The spindle drive motor (AC induction) rotates the spindle at 3600 rpm, utilizing abelt drive. It incorporates an inherent
mechanical brake for stopping spindle rotation when
power is turned off.
1-16. Air Supply
and Filtering
An impeller, installed on the spindle shaft, provides cooling air. Mostofthis airflow is routed under positive pressurethrough
the absolute filter which removes
99.97% of particles over 0.3 micrometers. This filtered air is separated into two flows.
One
is conducted through the cartridge and the upper positioner housing to the rear side. The other is conducted through
the fixed-disk module
area to the rear side. Some unfiltered air flows through ducts on each side to cool the electronics and
motor at the rear.
1-17. Deck Plate
Arigid aluminum-cast deck plate is used to mount all of the major components of the drive.
1-18.
Main Frame
The main frame consists of afront panel. an operation panel. and the frame on which the deck plate is placed. Rack-
mountable rails (accessory) are available.
1-19.
Operator Control Panel
The operator control panel is mounted on the front of the drive, immediately beneath the disk cartridge access door. This
panel contains operating controls and provides the operator with avisual indication of the drive's operational status.
Included on the panel
are three switches, five indicator lights, and one address ID plug. These switches and indicators are
listed below. Adetailed description of each is provided in section II.
•START/STOP switch
•TRANS indicator
•READY
UPPER indicator
•READY LOWER indicator
•WRITE
PROTECT UPPER ON/OFF switch
•WRITE
PROTECT LOWER ON/OFF switch
•
CART indicator
•FAULT
LED
•ADDRESS ID plug
1-20. SPECIFICATIONS AND PERFORMANCE CHARACTERISTICS
The drive specifications and performance characteristics are listed in tabular form in the following paragraphs.
1-5

1·21. Basic Specifications
Storage Capacity (Unformatted):
DFR-932:
DFR-964:
DFR-996:
Number of
Disks:
Cartridge:
Fixed:
Disk Surfaces:
Cartridge:
Fixed DFR-932:
Fixed DFR-964:
Fixed DFR-996:
Number of
Heads:
Cartridge:
Fixed DFR-932:
Fixed DFR-964:
Fixed DFR-996:
20,160 bytes/track; 16,289,280 bytes/surface
32,578,560 bytes/unit (cartridge x1, fixed x1)
65,157,120 bytes/unit (cartridge x1, fixed x2)
97,735,680 bytes/unit (cartridge x1 ,fixed x3)
1, 2, or 3
servo, 1data
servo, 1data
servo, 3data
1
servo, 5data
1
servo head, 1read/write head
1 servo head, 2read/write heads
1 servo head, 6read/write heads
1 servo head, 10 read/write heads
NOTE
See figures 1-3 and 1-4 for head-numbering arrangements.
1-6
Tracks/Surface:
Cartridge:
Fixed:
Minimum Data Tracks:
DFR-932
DFR-964
DFR-996
823
823
(412 +411)
1616
3232
4848