Control Data Corporation 5R2A5 User manual

CONTROL
DATA®
DISK
STORAGE
UNIT
5R2A5
6ENERAL
DESCRIPTION
OPERATION
INSTALLATION
AND
CHECKOUT
THEORY OF OPERATION
MAINTENANCE
CONTROL
DATA
C
OR P0 RATION
CUSTOMER
ENGINEERING MANUAL

REVISION
RECORD
REVISION
DESCRIPTION
01
Preliminary edition.
(3—1—71)
A
Manual released.
This
edition supercedes all
previous editions.
(7—28—71)
B Incorporates Engineering Change Orders
PE29151, PE29419, PE29440, and Technical Corrections
(9—17—71) affecting pages ii, iii, viii, 1—3, 2-4,
2—7, 2—8, 2—9,
3-2,
3—7, 3—8,
3—9,
4—12, 4—13, 4—22, 4—23,
4-24,
4—25,_4-26,_4-28,_4—30,_6-1,_6—2,_6—18,_6—19,_6-20,_6-21,_6—31,_6—32,_6—32.1,_6—41,
Comment Sheet.
C
Incorporates Engineering Change
Order
PE29476/Field Change Order PE29479 affecting pages
(10- 1-71)
Ii, iii, iv, 6-24, 6-29, 6-30, Comment
Sheet.
D Incorporates
Engineering/Field
Change
Order PE29504 affecting pages ii, Iii, iv,
6-30, 6-33,
6-34,
(12-17-7 1)
Comment
Sheet.
E
Incorporates
Field Change Order
PE29502
affecting pages II, Iii, iv,
6-7,
Comment Sheet.
(2—25-72)
F Incorporates
Technical Corrections
affecting
pages
II, lii, lv, vii, viii, Ix, 3-1, 6-3, 6-4,
6-5,
(4-13-72)
8-6, 6-7, 6-8, 6-9,
6-10, Comment
Sheet.
G
Incorporates Engineering
Change Order PE3
1156/Field
Change Order PE3ll57 and Technical
(9—7—72)
Corrections affecting
pages
ii, iii, iv, 6-5, 6—6, 6-25, 6—27.
H
Incorporates Engineering
Change
Order PE3
1283/Field
Change Order
PE3 1297
affecting pages
(12—21—72) ii, ill,
iv,
6—25, 6—27.
J
Incorporates Engineering Change Order PE3 1317 documenting
BR2A5A,
60 lIz
units and Technical
(2—2—73)
Corrections affecting
pages
ii, lii, iv, viii, ix, 1-3,
2-4, 2—5, 2-7,
3-3,
3-6, 4-26, 6-1,
6-2, 6-5,
6—15, 6—18, 6—19, 6—20, 6—21, 6-22, 6—23, 6—29, 6—30, 6-31, 6—32, 6—34, 6-37, 6-39,
6—42,
6-43,
6-44, 6-49.
Page
6-32.1
deleted.
K
Incorporates Engineering/Field
Change
Order
PE3
1594 and Technical Corrections affecting
pages
(3-10—74)
ii,
iii, iv, viii, 4—23, 4—24, 4—26, 6—24,
6—48,
6-48.1.
L
Technical
changes affecting
pages; ii. iii.
Iv.
6-50. 6-51.
6-53.
(8—16—74)
Publication No.
70614600
©
1971. 1972, 1973, 1974
by
Control
Data Corporation
Printed in the
United States of
America
Address comments concrning
this
manual
to:
Control
Data Corporation
Technical Publications Department
7801
Computer Avenue
Minneapolis,
MN
55435
or use
Comment Sheet In the
back of
this
manual.
0
11
70614600
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PUBLICATION
NO.
PUBLICATION
TITLE
MANUAL
STATUS
CHECK
SHEET
70614600
Sheet
1
of
2
BR2A5
Disk
Storage
Unit Maintenance
REVISION
Manual
PAGE NUMBER REV
Cover
-
Title
Page
-
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F
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70614600 L
111

PUBLICATION NO.
PUBLICATION TITLE
MANUAL
STATUS
CHECK
SHEET
70614600
Sheet
2
of
2
BR2A5
Disk
Storage
Unit
Maintenance
Manual
REVISION
L
PAGE
NUMBER REV
6-51
L
6-52
6-53
L
6-54
A
6-55
A
6-56
A
6-57
A
6-58
A
PAGE
NUMBER
REV
6-59
A
Sec7,8,
9,
10
-
Cmt
Sht
-
Return
Env
-
BackCover
-
C
C
C
iv
70614600
L

PREFACE
Customer
engineering
material
for
the
CONTROL
DATA®
BR2A5 Disk Storage
Unit
is contained
in three separate manuals
and
provides
all information
needed to
install,
operate,
and
maintain the
unit:
Publication
No.
70614600 General
Description,
Operation, Installation
and Checkout, Theory
of Operation, Maintenance
Publication No.
70614700
Diagrams,
Maintenance
Aids,
Wire
Lists
Publication
No.
70614800
Illustrated
Parts
List
70614600
A

CONTENTS
1.
GENERAL DESCRIPTION
Introduction
1-1
Equipment
Specifications
1-2
2.
OPERATION
Controls
and
Indicators
Operating
Instructions
DSU
Power
Application
Disk
Pack
Installation
Disk
Pack
Removal
3.
INSTALLATION
AND
CHECKOUT
Uncrating
Space
Allocation
Leveling
and
Aligning
Cabling
and
Connections
Cabinet
Intracabling
Input/Output Cables
Power
Cables
Ground
Bond
Cabinet
Accessories
Input
Power
Requirements
Environment
Initial
Checkout and
Startup
Procedure
4.
THEORY OF
OPERATION
Functions
First
Seek
Direct
(Forward/Reverse)
Seek
Return
to
Zero
Seek
(RTZS)
Read/Write/Erase
Assemblies
Power
Supply
AC
/DC
Distribution
Power-On
Sequence
Power-Off
Sequence
Logic Chassis
Deck Assembly
Drive
Motor
Assembly
Hysteresis Brake
Assembly
Spindle
Assembly
Actuator
Transducers
Track
Servo
Disk
Cleaner
Assembly
Blower
System
Disk
Pack
6.
MAINTENANCE
Maintenance
Tools
Maintenance
Materials
Preventive
Maintenance
General
Preventive
Maintenance
Index
Inspect
Actuator Assembly
Clean
Front
Cover
Glass
Change
Primary
Filter
Check
Power
Supply
Outputs
Inspect
and
Clean
Read/Write
and
Servo
Heads
Clean
Shroud
and
Spindle
Clean
Pack
Cleaning
Brushes
Clean
and
Lubricate
Lockshaft
Replace
Absolute
Filter
2-1
2-8
2-8
2-9
2-10
3-1
3-2
3-2
3-2
3-2
3-4
3-6
3-6
3-6
3-6
3-7
3-7
4- 1
4-12
4-13
4-21
4-22
4-23
4-23
4-23
4-25
4-27
4-28
4-29
4-29
4-31
4-31
4-33
4-39
4-40
4-41
4-44
4-45
6-1
6-2
6-2
6-2
6-3
6-3
6—3
6-4
6-5
6-6
6-7
6-7
6-8
6-8
70614600
F
vii

C
Corrective
Maintenance
CDC
Pack
Cleaning
Procedure
Read/Write
and
Servo
Heads
Check
Head/Arm
Adjustment
Head/Arm
Removal
Replacement
Adjacent Track Erase
Check
Tuned Amplifier
Check
and
Adjustment
Drive Belt
Removal
and
Replacement
Drive
Motor Removal
and
Replacement
Drive
Motor
Pulley Removal
And
Replacement
Hysteresis
Brake
or
Felt
Removal
and
Replacement
Spindle Lock
Pawl
Check
Adjustment
Pack-On
Switch
Check
and
Adjustment
Removal
and
Replacement
Ground
Spring
Check
and
Adjustment
Spindle
and
Lockshaft Assembly
Lockshaft
Removal
and
Replacement
Spindle
and
Lockshaft
Assembly Removal
and
Replacement
Index
Sensor
Assembly
Sensor Stop
Check
and
Adjustment
Index to
Burst
Check
and
A
djustment
Index Transducer
Removal
and
Replacement
Transducer Output
Check
Shroud
Adjustment
Disk
Cleaner Assembly
Check
Adjustment
Removal
and
Replacement
Head
Select
Preamplifier
Card
Removal
and
Replacement
Heads
Loaded
Switch
Check
Removal and
Replacement
Velocity Transducer
Check
Removal
and
Replacement
Carriage
Alignment
DC
Offset Check/Adjustment
Track Servo
Amplitude
Adjustment
Power
Amplifier
Check!
Adjustment
Velocity Gain
Check Adjustment
Fine
Position
Gain
Check!
Adjustment
Integrator Gain
Check/
Adjustment
Servo/Filter
Balance
Check!
Adjustment
Troubleshooting
6-57
Track Pulse
Troubleshooting
Access Troubleshooting
6-9
6-9
6-9
6-10
6-14
6-19
6-20
6-23
6-25
6-27
6-27
6-29
6-29
6-29
6-29
6-29
6-30
6-30
6-31
6-31
6-32
6-34
6-34
6-35
6-37
6-38
6-38
6-39
6-39
6-39
6-41
6-41
6-42
6-42
6-43
6-43
6-43
6-44
6-46
6-47
6-48.
1
6-48.
1
6-50
6-50
6-53
6-55
C
C
C
C
C
C
C
C
6-57
6-58
viii
70614600
K
C

FIGURES
2-1
Controls and
Indicators
3-1
Cabinet
Intracabling
Diagram
3-2
System Intercabling
4-
1
Input/Output
Signal
Gating
4-2
Select
Sequence
4-3 Block
Diagram
4-4 Servo
Circuit
Block
Diagram
4-5
Typical Servo
Signal
Relationships
4-6
Fine
Position
Servo
Signals
4-7
Power Supply
- AC/DC
Distribution
4-8 Power Supply
-
Sequencing
4-9
Deck
Assembly
4-10
Spindle Assembly
4-11
Actuator Assembly Elements
4-12
Head
Loading
4-13
Head/Arm
Assembly
Motion
4-14 Index/Sector
Detection
4-15 Velocity
Detection
4-16
Track
Servo
Dectection
4-17 Track
and
EOT
Pulses
4-18 Blower
System
6-1 Cabinet Filters
6-2
Pack
Cleaning
Brushes
6-3 Head
Identification
6-4
Head
Adjustment Trace
6-13
6-5
Head/Arm
Assembly Adjustment
6-15
6-6
Head/Arm
Replacement
6-16
6-7
Head/Arm
Installation
or
Removal
6-17
Symmetry
Adjustment
6-20
Read
Oscillator
Output
Waveform
6-21
Symmetry
Strobe
Relation
6-22
Main
Deck
Underside
6-24
Motor
and
Brake
Assembly
6-26
Index Sensor
6-33
Index
to Burst Period
6-36
Detector Trace
6-37
Index
Transducer
Trace
6-38
Disk
Cleaner
Adjustment
6-40
Read/Write
Head
Cable
Connections
6-42
6-18
Velocity
Transducer
Replacement
6-45
6-19
Carriage
Alignment
6-47
6-20
Power Amplifier
Adjustment
6-49
6-21 Velocity Gain
Adjustment
6-51
6-22
Fine
Position Gain
Adjustment
6-52
6-23
Integrator
Gain
Adjustment
6-55
6-24
Servo
Filter
Balance
Adjustment
6-56
TABLES
2-1
4-2 Servo
Circuit
Functions
4-17
6-i Read/Write
Head
Replacement
3-5
Data
6-18
4-4
I
6-8
6-9
6-9.1
6-10
6-li
6-12
6-13
6-14
6-15
6-16
6-17
2-7
3-3
3-4
4-2
4-2
4-3
4-15
4-16
4-21
4-24
4-26
4-30
4-32
4-34
4-36
4-38
4-40
4-40
4-42
4-43
4-44
6-4
6-8
6-12
2-1 Controls and
Indicators
3-1 Input/Output Connector
Pin
Assignments
4-1
Input/Output
Lines
70614600
J
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