Control Data BM1A5 User manual

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CONTROL DATJ);.
·MUL TIPLE DISK DRIVE
CONTROL DATA
BM1A5
GENERAL DESCRIPTION
OPERATION
INSTALLATION"
CHECKOUT
MAINTENANCE
CUSTOMER ENGINEERING MANUAL

•

CONTROL DAT~
MULTIPLE DISK DRIVE
CONTROL DATA
:::ORPORAT10N
BM1A5
GENERAL DESCRIPTION
OPERATION
INSTALLATION &
CHECKOUT
MAINTENANCE
CUSTOMER ENGINEERING MANUAL

REVISION
A
(9-27- 69)
B
(12-1- 69)
C
(4-24-70)
D
(12 -7 -70)
RECORD
of
REVISIONS
NOTES
Manual released.
Engineering Change Order PE1l269 incorporating the following:
Editorial changes affecting cover
title page,
pages iii, v, 1-1, 1-2, 1-3, 1-4,2-1, 2-2, 2-3,
2-4,2-5,
2-6, 2-8
2-14, 3-2
3-5
3-6
3-16,
Section 4 and 5 filler, 6-2, 6-47,
6-8!, Section 7,
8,
9 filler,
comment sheet.
Technical
changes affecting pages v, 3-14, 3-15,
6-3,
6-12.
Engineering Change Order PE21147 incorporatin~ the following:
Engineering Change Orders PEll090,
PE11345, PE11475, PE11291, PE21058 affecting pages
vi,
1-3, 6-23, 6-25.1. thru 6-25.3, 6-34,
6-76, 6-77,
6-78.
Field Change Orders PE11204,
PE11294, PE21058, affecting pages vi, 6-25.1 thru 6-25.3, 6-34, 6-76, 6-77, 6-78. Technical
and editorial changes affecting pages 2 -10,
2-11, 2 -12, 3-1, 3 -3, 3 -15,
3-16, 6-1, 6-2, 6-4 thru
6-7, 6-16, 6-17,
6-18, 6-44, 6-54, 6-59, 6-61 thru 6-64, 6-66, 6-67, 6-68, 6-69, 6-70, 6-72
thru 6 -75,
6-79, 6 -81, 6 -85.
Engineering Change Order PE21852 incorporating the following:
Engineering Change Orders PE21197, PE21421,
PE21462.
Field Change Order P-E21512.
Technical and editorial changes.
This edition obsoletes all previous editions.
Address comments concerning this
manual to:
Pub No. 70602400
© 1969, 1970
Control Data Corporation
Technical Publications Department
4201 North Lexington Avenue
St. Paul. Minnesota 55112
by Control Data Corporation
Printed in United States of America
or use Comment Sheet in the back of
this manual.
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0:

PREFACE
All available customer engineering installation, operation, and maintenance informa-
tion for the CONTROL DATA8 BM1A5 Multiple Disk Drive is in three manuals:
Publication No. 70602400 General Description, Operation, Installation and
Checkout, Maintenance
Publication No. 70602500 Theory of Operation, Diagrams, Maintenance
Aids, Wire List
Publication No. 70601900 illustrated Parts. List
70602400 .S iii

CONTENTS
1.
GENERAL DESCRIPTION
Inspect and Clean Disk Pack
6-5
Cl ean Shroud and Spindle
6-7
2.
OPERATION
Check for Hydraulic Fluid
Leaks
6-7
Controls and Indicators
2-1
Check Hydraulic Fluid
Operating Instructions
Level
6-7
MDD Power Application
2-10
Check Pack Cleaning
Deck or Spindle Power
Brushes
6-8
Application
2-10
Change Primary Filter
6-8
MDD Power Removal
2-12
Inspect Cooling Fans
6-10
Disk Pack Installation
2-12
Check Power Supply Outputs
6-10
Disk Pack Removal
2-14
Lubricate Detent Pawl
6-12
Lubricate Detent Gear
6-12
3.
INSTALLATION AND CHECKOUT
JR,eplace Hydraulic Fluid
6-12
Uncrating
3-1 Lubricate Rack and Pinion
Gears
6-13
Space Allocation
3-2
Leveling and Aligning
3-2
Lubricate Carriage Roller-
6-13
ways
Cabling and Connections
Lubricate Head Load Latch
6-14
Cabinet Intracabling
3-3
Replace Abs'olute Filter
6-15
Input /Output Cables
3-3
Clean and Lubricate Lock-
Power Cables
3-4
shaft
6-15
Cabinet Accessories
3-4
Lubricate Head Load
Linkage
6-16
Input Power Requirements
3-12
Environm ent
3-13
Check Head / Arm Adjust-
6-16
ment
Initial Checkout and Start-
fGorrective Maintenance
6-21
up Procedure
3-13
Drive Belt
Check
6-22
6.
MAINTENANCE
Adjustment
6-22
Maintenance Tools
6-1
Removal and Replace-
Maintenance Materials
6-2
ment
6-22
P reventi ve Maintenanc e
Drive Motor Pulley
General
6-3
Check
6-24
Preventive Maintenance
Adjustment
6-24
Index
6-3
Removal and Replace-
Inspect and .. Clean Read/Write
ment
6-24
Heads
6-4
Drive Motor Removal and'
Replacement
6-24
70602400
D v

Spindle and Lockshaft Assembly 6 -25.1 Solenoid Removal and Re-
Lockshaft Removal and
placement
6-43
Replacement
6 -25.1
Head Load Mechanics
-Spindle and Lockshaft Assembly
Linkage Che ck and
Removal and ·Replacement 6 -25.3
Adjustment
6-43
Shroud Adjustment
6-26
Head Latch Switch
Spindle Lock Pawl
Check and Adjustment
6-46
Check 6-27
Head Loaded Switches
6-47
Adjustment
6-27
Carriage and Carriage Mount
Pack -On Switch
Removal and Replacement
6-48
Check
6-28
Adjustment
6-50
Adjustment
6-28
Hydraulic Home Check and
Adjustment 6-52
Removal and Replacement
6-29
~
Detent Transdu cer
Ground Spring Check and
Che ck and Adjustment
6-53
Adjustment
6-29
Disk Cleaner Assembly
Transducer or Preamp-
lifier Card Removal
Check
6-30
and Replacement 6-55
Adjustment 6-30
Cylinder Transducer
Removal and Replacement 6-31
Check and Adjustment
6-55
Detent Actuator
Transducer or Preamp-
Check
6-32
lifier Card Removal and
Replacement 6-58
Actuator Assembly Removal
6-32
Actuator Assembly Re-
Sector Sensor Assembly
placement 6 -32
Switch and Stop Check
and Adjustment
6-59
Actuator Assembly Adjustment 6 -32
Index to Burst Check
Actuator Diaphram
and Adjustment
6-61
Replacement 6-33
Transducer Removal and
Manually Positioning Carriage
6-35
Replacement
6-63
4
Hydraulic Fluid Removal and
Preamplifier Card Removal
Replacement
6-36
and Replacement
6-66
Hydraulic Pump or Pump Drive
Transducer/Preamplifier
Removal and Replacement
6-37
Output Che ck
6-66
Hydraulic Actuator Assembly
Sectop Sensor Positioner
Leak Check
6-39
Check and Adjustment
6-69
Removal and Replacement 6-39
Oscillator Check 6-70
a - Ring and Seal Repla cement
Read/ Write Heads
Head/ Arm Removal
Rear Cylinder Cap a-Ring
6-41
and Replacement 6-70
Valve Blqck a-Rings
6-41
Drive Piston Seal 6-41
Extend Piston Seal
6-42
vi
70602400
D
~

Write and Erase Current
Head Select Preamp
Amplitude Check
6-73
Card Removal and
Signal Amplitude Check
6-74
Replacement
6-79
Adjacent ,Track Erase Check6-75
Troubleshooting
6-81
Tuned Amplifier Check
Detent Troubleshooting
6-82
and Adjustm ent
6-76
Hydraulic Actuator
Torsion Rod Removal and
Intermediate Speed
Replacement
6-79
Troubleshooting
6-83
Repair of Hydraulic
Fluid Leakage
6-88
FIGURES
2-1
Controls and Indicators
2-2
6-14
Hydraulic Actuator
6-40
2-2
Disk Pack Load/Unload
6-15 Head Load Linkage
6-45
Mechanics
2-13
6-16 Head Latch Switch Ad-
3-1
Joining Cabinets
3-4.1
justment 6-47
3-2
Cabinet Intracabling
6-17
Heads Loaded Switch
Diagram
3-5 Adjustment 6-48
3-3
System Intercabling
3-6
6-18
Transducer Adjustment 6-50
3-4
Intercabling Routing
3-7
6-19
Carriage / Carriage
3-5
Trim and Dust Shield
Mount Alignment 6-51
Installation
3-11
6-20
Cylinder Transducer
3-6
Side Panel Installation and
Trace
6-57
Adjustment
3-12
6-21 Sector Sensor 6-60
6-1
Pack Cleaning Brushes
6-9 6-22
Index to Burst Period
6~63
6-2
Cabinet Filters
6-9
6-23
Sector Transducer
6-3
Detent Pawl and Gear
Trace
6-68
Lubrication
6-13
6-24
Detector Trace 6-69
6-4
Carriage Lubrication
6-14
6-25
Sector Sensor Positioner 6-70
6-5
Head Latch Lubrication 6-15
6-26
Head/ Arm Replacement
6-72
6-6
Head Identification
6-19
6-27
Symmetry Adjustment
6-77
6-7
Head Adjustment Trace 6-20
6-28
Tuned Amplifier Ad-
6-8
Head/ Arm Assembly
justment
6-78
Adjustment
6-21
6-29
Torsion Rod
6-80
6-9
Main Deck - Underside
6-23
6-30
Read/Write Head
6-10
Disk Cleaner Adjustment
6-31
Cable Connections 6-80
6-11
Detent Mechanism
6-34
6-31
Detent Transducer
Trace 6-83
6-12
Automatic Head Loading
6-32 Interm ediate Speed
Override
6-36
Characteristic s
6-86
6-13
Hydraulic Pump and Pump
Drive 6-38
70602400
D
vii

2 -1 MDD Panels and Indica-
tors
2 -2 Controls and Indicators
viii
TABLES
2-1
2-3
3-1 Input/Output Connector
Pin Assignments 3-8
6-1 Read/Write Head Replace-
ment Data 6-72
70602400 D

SECTION 1
GENERAL DESCRIPTION

GENERAL DESCRIPTION
The CONTROL DATA Multiple Disk Drive (consisting of equipment number BMIA5
is a random access data storage device that interfaces with a central processor via
a control unit.
The electromechanical multiple disk drive (MDD) positions its read/write heads to
discrete positions or tracks over spinning disk surfaces. Data, in the form of
magnetized bits or spots, is written on or read from the disk surfaces by the read/
write heads.
The MDD consists of independent and individually addressable decks. Each deck uses
a spindle-mounted disk pack assembly as its recording medium. The disk pack
assemblies used by the decks are mechanically interchangeable and magnetically
compatible with any similar Control Data Corporation MDD. Typically, all of the
decks are on-line, except for one which is available for use if servicing or mainten-
ance becomes necessary on any of the on-line units.
Decks for the MDD are mounted in cabinets. The BMIA5 cabinet contains two decks
and is referred to as a two- by (2X). Each deck consists of a deck assembly, supporting
logic and power components, and frame-mounted accessory equipment.
The deck assembly contains the hydraulic access mechanism, the speed and location
sensing devices necessary to position the read/write heads, and four Silicon Periph-
eral Logic (SPL) cards involved in read/write operations. This assembly also includes
the mounting and operational facilities required by the disk pack: spindle assembly,
spindle drive motor, and shroud. The shroud surrounds the disk pack and thereby
minimizes damage to the read/write heads and disk surfaces caused by the ingestion
of dust. A hinge-mounted logic chassis assembly is the mounting point for the main
complement of the SPL cards used by the deck(s): four cards are mounted on each
deck assembly. SPL cards for the cabinet are mounted in two rows (A and B). This
assembly also contains a maintenance panel, an I/O connector panel, and three fans
to cool the SPL cards. The maintenance panel provides jacks to monitor logic voltages,
for each deck in the cabinet, and a switch/lamp combination to analyze the occurrence
of an error, and an ON LINE I OFF LINE switch.
70602400 D 1-1

A solid-state power supply assembly provides +6, :1:20, and +40 vdc outputs. The
power supply in a 2X cabinet is shared by the decks of that cabinet. Power to each
deck of the 2X cabinet is controlled separately at the power supply control panel
(accessible when logic chassis is swung out).
A frame assembly provides the required mounting structure for the previously
mentioned assemblies. In addition to the structural elements, this assembly contains
the operator controls for the deck(s), a blower assembly, and facilities for input
power distribution. Each cabinet contains a circuit breaker that controls the application
of input power to the power supply of that cabinet. The output of the blower assembly
is ducted to the deck assembly(ies) to provide positive pressurization of the disk and
shroud area.
The equipment specifications for the MDD are as follows:
ACCESSING TIME
Maximum Access Time
Maximum One- Track Access Time
RECORDING
1-2
Mode
Density (nominal)
Bit Rate (nominal)
Data Transfer Rate
135 ms
24.5 ms
Double frequency
1530 bpi (outer track)
2220 bpi (inner track)
2.50 MHz
416,000 characters/second/deck
'0602400 D

DATA ORGANIZATION
Bits /Character
Characters jTrack
Tracks / Cylinder
Cylinders /Deck
Decks/MDD (aX)
6
10,085
20
200 + 3 spares
8
DATA CAPACITY - SECTOR ORGAN1ZATION
Bits/Track
Bits /Cylinder
Bits/Deck
DISK PACK
Disks /Disk Pack
Useable Recording Surfaces /
Disk Pack
Disk Surface Diameter
Recording Diameters
Disk Surface Coating
Disk Pack Velocity
READ/WRITE HEADS
Heads/Deck
Heads/MDD
Read/Write Track Width
Erase Track Width
T rack Spacing
70602400 :D
63" 250
I" 265. 000
253" 000. 000
11
20
14 inches
Track 202 (Inner) 9.068 inch nominal
Track 0 (Outer) 13.,1-52 inch nominal
Magnetic oxide
2400 (+36, -96) rpm
20
180 maximum
0.0065 inch
0.013 inch
0.010 inch
1-3

PHYSICAL - Each Cabinet
Height
Width
Depth
Weight - 2X cabinet
ELECTRICAL
Power Source
Operating Current (2X cabinet)
Standby Current (2X cabinet)
INPUT /OUTPUT CONNECTIONS
1-4
67 inches (170.18 cm)
32 inches (81. 28 cm)
40 inches (101. 6 cm)
1100, pounds (498. 96, kg)
380-volt (± 10%), 50 (+0. 6, -1. 2)
hertz, 3-phase, 4-wire wye
4 amps/phase
1. 7 amps /phase
Three connectors per cabinet located
below Logic Chassis Maintenance
panel. Pin assignments according to
Table 3-1. Connections according to
Figure 3-3.
70602400 D

SECTION 2
OPERATION

OPERATION
This section provides instructions and information related to operating the MDD.
CONTROLS AND INDICA TORS
The MDD contains a number of panels and indicators. Figure 2-1 locates the panels
and the indicator on a typical cabinet of the MDD. Table 2-1 provides panel and in-
dicator complements in terms of the 2X cabinet and the MDD. A functional description
of the controls and indicators is given in Table 2-2.
TABLE 2-1. MDD PANELS AND INDICATORS
PANEL OR INDICA TOR
NO. PER 2X
TOTAL PER 9X
Operator Panel
2 8
Filter Box Panel
1 4
Logic Chassis' Maintenance Panel
1 4
Track Number Indicator
2 8
Power Supply Panel
1 4
70602400 D
2-1

2-2
OPERATOR PANEL
FILTER BOX
PANEL
OfPART
MANUEL
DEFAUT
m
BRUSH P~~~RY MAIN
M(9)@(§fO
3AMP 3AMPDELAY
3AMP
UPPER SPINDLE
rWJ8
SAMP
LOWER SPINDLE
Iwe
5AMP
LOGIC CHASSIS MAINTENANCE PANEL
-20V
.20V
.6V
+40V
GND
© @ @ @ @
ON LINE ~5~ ERROR
~O(Q)
OFFLINE UPPER DECK
-2(N
+20V +6v +40V
GND
@ @ @ @ @
O@E~aAf (0)
OFF LINE LOWER DECK
+20 -20
mill]
LOCAL
@
REMOTE
+20Y +20Y
O@
3AMP
SA 4A
UPPER DECK
f7:0LTA8E
(lit ......
td (R.W.E)
OI'I'CYL
'\UItRUIT
(if::'
J JRoW.EI
OFfCYL
bURRENT
TRACK NUMBER
INDICATOR
m
+Oooo5(Q5
o 0 3AMP
112A 5A
DC +. START +40
(j) itJ 0'
OFF
LOWER DECK
m
112A SA
() +0) (3) (5 <5 @'
o 0 3AMP
DC -20 START +20
e§) 'e§) 0'
OFF
SBISA
Figure 2 -1. Controls and Indfcators
70602400 b