Control Data Corporation BR8 SERIES Owner's manual

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~ c:\ CONTI\.OL DATA
\!:I r:!I CORPOR{\TION
CONTROL DATA ®
FLEXIBLE DISK DRIVE
GENERAL DESCRIPTION
OPERATION
INSTALLATION AND CHECKOUT
THEORY OF OPERATION
DIAGRAMS
MAINTENANCE
MAINTENANCE AIDS
PARTS DATA
WIRE LISTS
MAGNETIC PE~PHER(\LS INC.
I';:ll::\ a subsidiary of
\:=J r:J CONTRPl DATA CORfORATION
HARDWARE MAINTENANCE MANUAL
77834769

f\~·es~
R E V
R
TABLE OF CONTENTS
E
DATE
SHEETS AFFECTED
V
W 79 PF
Mav23
ii
Y
ii,
iv
01978, 1979
Magnetic Peripherals Inc.
ii
I a I 0
1 2 3
L A A
L A A
~
- FDD FSM
N R E C 0 R D
MANUAL/SECTION REVISION STATUS
CHANGE
4 5 6 7
E U W A
E Y Y A
8 9 10
11
12
AUTHORITY
K A
PI 21165
K A
PL 21174
Address comments concerning this manual to:
Technical Publications
Magnetic Peripherals Inc.
4000 Northwest 39th Expressway
Oklahoma City, Oklahoma 73112
or use the enclosed user comment sheet.
Printed in the United States of America
All Rights Reserved
77834769-Y
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PREFACE
This manual provides the information needed to install, operate and maintain the
Control Data Corporation Flexible Disk Drive (FDD) and is intended to support
customer engineers who requii.~e detailed information about the Flexible Disk Drive's
operation.
The total content of the manual is comprised of two publications, each having a unique
pUblication number, and is contained in one volume. The Manual's publication number
(77834769) is that of the front matter, sections one through seven, and section
nine. This number should be used when making reference to the Flexible Disk Drive
Hardware Reference Maintenance Manual. Section VIII, Parts Data, is identified by the
unique pUblication number 77834771.
This manual applies to several models of the FDD. A configurator sheet is provided
on the following page which describes each FDD configuration that this manual will
support. Refer to the eqUipment nameplate located on the right hand sIde of the unit
(as viewed from the front) to determine the appropriate Top Mechanical Assembly
(TMA) and Model numbers. Then use the Configurator sheet as a starting point to
establish the maintenance level for the device.
77834769 -D
'iii

FLEXIBLE DISK DRIVE CONFIGURATOR SHEET
•
P V
0 D
W C
E
R V
R A
C
E
MAGNETIC PEI\IPHER..ALS INC
CS~~~~~~~rV~\A l()~'OR ... AIIU~
+5 & +24 AT J7
+5 & +24 AT I/O Jl
240, lit
220, 1 It
120
10'
10
100
10'
WRITE SPLICE ADJ. (See Table 6-2)
CIRCUIT BD. CONFIG. (See Table_5_-1t
o"AISY-CHAIN
INTERFACE
- ----
STANDARD INTERFACE
- - ----
--
TMA NO.
MODEL NO
75744001
BR803A
X 506
002
BR803B
X 506
003
BR803C
X 506
004
BR803D
X 506
005
BR803E
X 502
006
BR803F
X 502
007
BR803G
X
502
008
BR803H
X 502
009
010
011
012
013
BR803N
X 503
014
BR803P
X 503
015 BR803R
X 503
016
"BR803S
X 503
017
BR803J X 502
018
BR803K
X
502
019
BR803L
X
513
020
BR803M
X
513
021
BR8A3C
X 502
022
BR8A3D
X 502
023 BR8A3E
X 502
024
BR8A3F
X 502
025
BR8A2A X 505
026 BR803T
X 503
027
028
BR8A3A
X 501
029
0))
BR8A2B
X 505
031 BR8A2C
X 505
032
BR8A2D
X
505
033
BR8A2E
X 505
034
BR8A2F
X 506
035 BR8A2G 510
036 BR8A2H
X 506
037
BR8A2J
X 505
038 BR8A2K
X
509
039
BR8A2L
X
507
iv
--
-- --
------
----
--
-- --
----
-- -- --
- ---
-- ----
-- -- -- ----
603
X
603
X
603 X
603
X
603
X
603
X
603 X
603 X
602
X
602
X
602
X
602 X
603
603
603
. X
603
X
603
X
603
X
603 X
603 X
603
X
603
603
X
603
X
603 X
603
603
X
603
X
603
X
603 X
603 X
603
X
603
X
--
-- --
--
-- --
- - --
--
- -
--
--
--- - --
------
---- --
--
----
- - -- --TMA
NO.
X 75744041
X 042
X 043
X 044
X 045
X 046
X 047
X 048
049
050
051
052
X 053
X 054
X
055
X
056
X X 057
X X
058
X 059
X
060
X
061
X
062
X 063
X 064
X 065
X X
066
067
X
068
0,S9
X 070
X 071
X X
072
X 073
X 074
075
X
076
X 077
X 078
X 079
TOP MECHANICAL ASSEMBLY NO. (TMA)
MODEL NO. (BR8XXX)
AC POWER REQUIRED (ON UNITS LABELED 50/60 Hz·
CHECK CONFIGURATION OF PULLEY FOR
FREQUENCY) •
EQUIPMENT
STATUS NUMBER
UNIT SERIAL NO.
MODEL NO
BR8A2N
X
505
603
BR8ASA
X 508
603
BR8ASB
X 508
603
BR8A2W
X 501
603
BR8A2Y X
501
603
BR8A6B X
506
603
BR803U X
506
603
BR8A2S
X 510
603
BR8A2T
X
510
603
BR8A2U
X
512
603
BR8A2V
X
507
603
BR8A2Z
X
505
603
BR8A3G X 504
601
BR8A3H X 504
601
X 509 603
BR8ASC
X 508 603
BR8ASD
X
511
603
X
X X
X X
X X
X X
X X
X
X
X X
X
X X
X X
X
77834769-Y
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X
X
X
X
X
X
X
X
X
X
X
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TABLE OF CONTENTS
SECTION
PAGE
I GENERAL DESCRIPTION
1. 1 INTRODUCTION •• • • • • • • • • • • • • • • • • • • • • • • • • •• 1-1
1. 2 PURPOSE AND USE OF EQUIPMENT •••••••• • • • • • • 1-1
1.3 PRODUCT DESCRIPTION ••••••••••••••••••••••• 1-1
1.3. 1 Physical Description ••••••••••••••••••• 1-2
1. 3. 2 Electrical Description •••••••••••••••••• 1-2
1. 3. 3 Performance Characteristics ••••••••••••• 1-2
II OPERATION
2.1
2.2
2.3
2.4
INTRODUCTION •••••••••••••••••••••••••••••
OPERATING INSTRUCTIONS ••••••••••••••••••••
2. 2. 1 Flexible Diskette Loading ••••••••••••••••
2.2. 2 Flexible Diskette Removal •••••••••••••••
ERROR RECOVERY ••••••••• • • • • • • • • • • • • • • • • • •
2. 3. 1 Seek Error • • • • • • • • •••••••• • • • • • • • • • •
2. 3. 2 Write' Error •••••••••••••••••••••••• • •
2. 3. 3 Read Error • • • • • • • • • • • • • • • • • • • • • • • • • •
DISKETTE HANDLING RECOMMENDATIONS ••••••••••
2-1
2-1
2-1
2-1
2-1
2-1
2-1 .
2-2
2-2
III INSTALLATION AND CHECKOUT
3.1
3.2
3.3
3.4
3.5
3.6
INTRODUCTION •••••••••••••••••••••••••••••
UNPACKING ...............................
INST ALLA TI ON •••••••••••••••••••••••••••••
CABLING AND CONNECTIONS •••••••••••••••••••
3.4. 1 Input/ Output Cable •••••••••••••••••••••
3. 4. 2 DC Power Connection • • • ••••••••••••••••
3.4. 3 AC Power Connection •••••••••••••••••••
ENVIRONMENT •••••••••••••••••••••••••••••
INITIAL CHECKOUT ••••••••••• • ••• • • • • • • • • • • •
3.6.1
Operating Frequency. • • • • • • • • • • • • • • • • • • •
3-1
3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-2
3-3
JV THEORY OF OPERATION
4. 1 INTRODUCTION. • • • • • • • • • • • • • • • • • • • • • • • • • • •• 4-1
4.2 GENERA L DESCRIPTION • • • • • • • • • • • • • • • • • • • • • •• 4-1
4.3 FUNCTIONAL DESCRIPTION •••••••••••••••••••• 4-3
4.3. 1 Control Logic • • • • • • • • • • • • • • • • • • • • • • •• 4-3
4.3.2 Write and Fault Logic. • • • • • • • • • • • • • • • • •• 4-6
4.3.3 Read Logic • • • • • • • • • • • • • • • • • • • • • • • • •• 4-6
4.3.4 Disk Drive • • • • • • • • • • • • • • • • • • • • • • • • •• 4-7
4.3.5 Read/Write Head ••••••••••• I •••• • • • • • •• 4-7
77834769-A
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SECTION
PAGE
4.4 CONTROL AND DATA LINE CHARACTER1S.TICS • • • • • • •• 4-7
4.4.1 Logic Levels ••••••••••••••••••••••••• 4-7
4.4.2 Transmitter Characteristics ••••••••••••••• 4-7
4.4.3 Line Receiver Characteristics ••••••••••••• 4-7
4.4.4 Control and Data Line Functions. • • • • • • • • • • •• 4-8
V DIAGRAMS
5.1 INTRODUCTION. • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 5-1
VI MAINTENANCE
vi
6.1
6.2
6.3
6.4
6.5
6.6
6.7
INTRODUCTION ..............................
MAINTENANCE TOOLS •••••••••••••••••••••••••
PREVENTIVE MAINTENANCE.' ••••.••••••••••••••••
HEAD CLEANING •••••••••••••••••••••••••••••
TROUBLESHOOTING •••••••••••••••••••••••••••
6. 5. 1 DC Voltage and Signal Check • • • • • • • • • • • • • • •
6.5.2 Diskette Not Rotating •••••• ' •••••••••••••
6• 5. 3 Ready Signal Mis s ing •••••••••••••••••••
6.5.4 Drive Not Responding to Commands ••••••••••
6.5.5 Index Pulse Missing •••••••••••••••••••••
6. 5. 6 Head Not Loading ••••••••••••••••••••••
6. 5. 7 Read/Write. Head not Stepping ••••••••••••
6.5. 8 NO ,Track "00" Indicator ••••••••••••••••
6.5.9 Read Errors ••••••••••••••••••••••••••
6.5.10 Write Errors ••••••.•••••••••••••••••••
6.5.11 Write Protect Inoperative •••••••••••••.•••
ADJUSTMENT PROCEDURES •••••• ••••••••••••••
6.6.1 Carriage-Stop Adjustment •••••••••••• ' ••••
6.6.2 Burst to .Index Check and Adjustment ••••••••••
6.6.3 Actuator Alignment (Diskette) ••••••••••••••
6.6.4 Push Rod Travel Adjustment. •••••••••••••••
6.6.5 Door Interlock Switch Adjustment. ' •••••••••••
6.6.6 Disk Load Bail Adjustment ••••••••••••••••
6.6. 7 Spindle and Cone Adjustment •••••••••••••
6.6.8 Write Protect Assembly Adjustment ••••••••••
6.6. 9 Track "00" Switch Adjustment ••••••••••••••
REMOVAL AND REPLACEMENT PROCEDURES ••••• ' •••
6. 7. 1 Printed Circuit Board (PWA) •••••••••••••••
6.7.2 Actuator Assembly •••••••••••••••••••••
6. 7.3 Drive Motor Assembly • • • • • • • • • • • • • • • • • • •
6. 7.4 Head Load Pad Replacement •••••••••••••••
6. 7.5 Solenoid Replacement and Tang Adjustment •••••
6. 7.6 Carriage arid/or Stepper Motor Replacement •••••
6-1
6-1
6-1
6-1
6-2
6-2
6-5
6-6
6-7
6-8
6-9
6.-10
6-12
6-13
6-15
6-17
6-18
6-18
6-19.2
6-21
6-22
6-23
6-24
6-25
6-26
6-26
6-27
6-27
6-27
6-29
6-29
6-29
6-31
77834769-,H

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SECTION .
PAGE
6. 8 FREQUENY CONVERSION ••••••••••••••••••••••• 6-31
6.8.1 Operating Frequencies Conversion Procedure. • •• 6-31
VII MAINTENANCE AIDS
7.1 INTRODUCTION •••••••••••••••••••••••••••••• 7-1
7.2 PHYSICAL DESCRIPTION (Logic) •••••••••••••••••• 7-1
7.3 USE OF RELATIVE LEVEL INDICATORS. • • • • • • • • • • •• 7-1
7.4 INTEGRA TED CIRCUITS •••••••••••••••••••••••• 7-1·
VIII PARTS DA TA
8.1
8.2
8.3
8.4
8.5
8.6
INTRODUCTION ..............................
ILLUSTRATIONS ••••••••••••••••• " •••••••••••••
PARTS LISTS ••••••••••••••••••••••••••••••••
TOP MECHANICAL AND ASSEMBLY LOCATOR •••••••••
8.4.1 Top Mechanical Assembly (TMA) •••••••••••••
REPLACEMENT PARTS •••••••• ' •••••••••••••••••
PARTS LIST INSTRUCTIONS ••••••••••••••••••••••
8.6. 1 lllustration Parts Lists •••••••••••••••••••
8.6.2 Top-Down Assembly/Component Parts List •••••
8.6.3 Cross Reference Index •••••••••••• , ••••••
8. 6•4 Sheet Number Referencing ••••••••••••••••
IX WillE LISTS
8-1
8-1
8-1
8-1
8-1
8-1
8-10
8-10
8-10
8-10
8-10
9. 1 INTRODUCTION. • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 9-1
9.2 UPPER HARNESS ASSEMBLIES. • • • • • • • • • • • • • • • • • •• 9-1
9.3 LOWER HARNESS ASSEMBLY •••••••• '. • • • • • • • • • •• 9-1
9.4 STEPPER MOTOR •••••••••••••••••••••••••••• 9-1
9.5 WRITE PROTECT • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 9-1
77834769-A
vii

LIST OF ILLUSTRATIONS
C~
FIGURE,
TITLE
PAGE
2-1
Diskette Installation
2-2
3-1
AC Cable Assembly
3-3
4-1 Functional Block Diagram
4-5
5-1 Timing
5-2
5-2
Schematics
5-4
5-3
Assembly and Parts List
5-10
6-1
-Head Load and Door Interlock Switch
6-3
6-2 Differential Read Signal for Entire Track
6-4
6-3 Differential Read Signal for Portion of
Outer Track 6-4
6-4
Write Data, Write F/F Output, and Head Write
Voltage for Outer Track 6-4
6-5 Base and Chassis Support Assembly
6-19
6-6 Carriage-Stop Adjustment 6-19.1
6-6a
Plastic Carriage-Stop and Stop-Gauge Assemblies
6-19.1
6-6b
Metal Carriage-Stop Assembly 6-19.1
6-7
Write Splice Bit to Index Timing 6-20
C~~
6-8 Head Alignment Amplitude 6-22
6-9 Chassis Base Assembly 6-23
6-10
Disk Load Solenoid 6-24
6-11 Spindle and Cone 6-25
6:"'12
Base Casting Assembly
6-28
6-13
Head Load Pad Replacement Illustration
6-30
6-14 Solenoid Adjustment 6-31
6-15
Drive Pulley Reversal 6-32
7-1
Inversion Conventions
7-1
7-2
Integrated Circuit 7-2
7-3
Schematic Symbols 7-2
LIST OF TABLES
TABLE
TITLE
PAGE
4-1 Phase Sequence of Stepper Motor 4-3
4-2 Input/ Output Lines
4-8
5-1
PWA Configurator 5-1
6-1
Flowchart Reference
6-2
('
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GENERAL DESCRIPTION
1.1 INTRODUCTION
The Flexible Disk Drive (FDD) is a compact, portable, random access, data storage
device that interfaces with a central processor via a control unit. Input/Output
data and control signals are transmitted by means of an r/o cable.
1.2 PURPOSE AND USE OF EQUIPMENT
Data, in the form of magnetized bits, is written on, or read from the tracks of a rotating
diskette. The FDD uses a single, flexible, removable diskette (one recording surface)
enclosed in a sealed jacket. The unit is capable of hard-sector or soft-sector (missing
clock) format operation, but the missing clock must be recovered externally (from the
FDD).
1.3 PRODUCT DESCRI PTI ON
The major FDD components are the spindle, disk drive motor, read/write head,
stepping motor, track indexing device, and printed circuit board.
The options include Write Protect, Data/Clock Separation, Power Reduction, Sector
Separation, Unit Select, Ready, Door Unlock, Write Fault, and Hour Meter.
All FDD components are mounted on a base assembly. The front panel has a spring
loaded door through which the'diskette is installed. The door is mechanically linked
to the disk loading mechanism and the head load interlock switch; therefore, when the
door is closed the Read/Write head may be loaded on the diskette in preparation for the
transfer of data.
Standard Models Versus Daisy-Chain Models - Throughout this manual certain features
and operation of the Flexible Disk Drive are described in terms of the manner in which
the FDD is designed to be connected to its controller, either standard or daisy chain.
Standard models are designed to be connected to their associated controller in star
fashion wherein each FDD unit has its own complete umbilical cable connection to the
controller, with no interconnection between FDD units. Standard FDD model units
are always in a ready state for reading or writing operation after initial preparation
and turn on.
Daisy-chain models are designed so that one to four FDD units may be connected
seria.lly to a common contro.ller. The controller continously monitors the operational
readiness of each FDD in its chain and commands and controls the reading and writing
operation of any selected FDD unit in its chain.
77834769-U
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1

1.3.1 PHYSICAL DESCRlPTION
The physical dimensions for the equipment are as follows:
Height
Width
Depth
Weight
4.97 inches (126. 2mm)
8.78 inches (223.0mm)
14.24 inches (361.7mm)
12 lbs. (5.44 kgm)
1 .3.2 ELECTRICAL DESCRIPTION
The electrical specifications for the equipment are as follows:
• DC Power Source (Supplied by HOf;;t Equipment)
Without Stepper-Power Reduction
+24 Volts (± 10%) @ 1.·3 A Typical
+ 5 Volts (± 5%) @ O. 8 A Typical
With Stepper-Power Reduction
r 1. 3A Typical, Stepping
+24V
(±10%) @{O. 3A Typical, Not Stepping
+ 5V (:!: 5%) @ 1.0 A Typical, Not St~pping
• A. C. Power Source - Refer to the FDD configurator or FDD nameplate
to determine A. C. Power requirements.
1 .3.3 PERFORMANC.E CHARACTERISTICS
The equipment specifications for the FDD are as follows:
1-2
• ACCESSING TIME
Maximum Access Time
Maximum One-Track Access Time
A verage Access Time
• RECORDING
770 ms
20 ms
263 ms
Mode
Density (nominal) Double
Freq. MFM
1836 B.PI(72.3 BPmm) 3672 BPI (144.6 BPmm) Outer Tracl(
3268 BPl(128.7 BPmm) 6536 BPI (257.3 BPmm) Inner Tract(
Data Transfer Rate
Bits/Byte
Bits/Track
Tracks
Sectors
• DATA CAPACITY
Bytes/Track
Bits/Track
Bits/Diskette
249, 984 bits/sec
8
41,664
77
Format Determined
5,208
41,664
3,208, 128
-----.-- .. -----.--- - ...
499, 968 bits/sec
8
83,328
77
Format Determined
10,416
83,328
6,416,25'6
77834769-K
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• FLEXIBLE DISKETTE
(Optional),
Diskette Dimensions
Useable Diskette Recording
Surfaces
Diskette Surface Diameter
Recording Radii
Diskette Surface Coating
Diskette Velocity
• READ/WRITE HEAD
Head Unit
Track Width
Track Spacing
Erase to Read/Write Gap
77834769 -D
CDC 421-60W, Single Density,or Equiv.
CDC 423-60W, Double Density, or Equiv.
8 x 8 inches (203. 2 x 203. 2mm)
(including jacket
1
7. 88 inches (200. 1mm)
Track 76 (inner) 2. 0290 inches (515mm)
nominal
Track 00 (outer) 3. 6123 inches (918mm)
nominal
Magnetic Oxide
360 rpm
1
0.013 in·,
0.02083 in.
0.035 in.
(0.33 mm)
(0.529 mm)
(0.889 mm)
1-3/1-4

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OPERATION
2.1 INTRODUCTION
The FDD is under direct control of the input/output and power sources. No special
start-up procedure is required. Operation is fully automatic and requires no operator
intervention during normal operation.
2.2 OPERATING INSTRUCTIONS
Verify that power and I/O cables are securely attached before operation.
2.2.1 FLEXIBLE DISKETTE lOADING
a. Apply AC/DC power to unit.
b. Open FDD door.
c. Remove diskette from storage envelope as shown in Figure 2-1.
d. On units with the Write-Protect option, be sure the Write-Protect slot in the
jacket is open, as shown in Figure 2-1, if the diskette is to be write-protected.
e. If a diskette with a Write-Protect slot is not utilizing the Write Protect, that is,
it will be written on, the slot must be covered with a piece of tape which is opaque
to infrared.
f. Carefully slide diskette into FDD, as shown in Figure 2-1, until jacket is solidly
against stops.
g. Carefully close unit door. Ensure that jacket is properly seated, spindle has
engaged diskette, and door is closed and latched.
h. Protect the empty envelope from liquids, dust, and metallic materials.
2.2.2 FlEXIBlE DISKETTE REMOVAL
a. Open FDD door to stop diskette rotation and disenagage spindle.
b. Remove diskette from FDD and put it in its storage envelope.
c. Close FDD door.
2.3' ERROR RECOVERY
The following paragraphs give information needed to recover from possible errors in
equipment operation.
2.3. 1 SEEK ERROR
Seek errors will rarely occur unless the stepping rate is significantly exceeded. In
the event of a seek error, recalibration of track location can be achieved by repetitive
Step Out commands until a Track 00 signal is received.
,2.3.2 WRITE ERROR
2
To guard against degradation from imperfections in the media, no more than four
attempts to write a record should be used when Read After Write errors are encountered.
In the event a record cannot be successfully written within four attempts, it is recom-
mended that the sector or track be labeled defective and an alternate sector or track
assigned. If more than two defective tracks are encountered, it is recommended that
the diskette be replaced.
77834769-A
2-1

HOLD HERE
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O
WRITE PROTECT SLOT
.... __ ....... _-..Ju;;:;::r----I(WRITE PROTECT FEATURE
Figure 2-1. Diskette Installation
2.3.3 READ ERROR
OPERATIONAL, WHEN SLOT
WITH
WRITE PROTECT
IS UNCOVERED).
In the event of a Read error, up to 10 attempts should be made to recover with re-
reads. If after 10 attempts the data has not been recovered, step the head several tracks
away and then re-position to recover the data. Unloading the head when data transfers
are not imminent will increase the data reliability and extend the diskette life.
2.4 DISKETTE HANDLING RECOMMENDATIONS
Since the recorded diskette contains vital information, reasonable care should be
exercised in its handling. Longer diskette life and trouble free operation will result
if the following recommendations are followed.
a. Do not use a writing device which deposits flakes e. g., lead or grease pencils,
when writing on diskette jacket label.
b. Do not.fasten paper clips to diskette jacket edges.
c. Do not touch diskette surface exposed by jacket slot.
d. Do not clean diskette in any manner.
e. Keep diskette away from magnetic fields and from ferromagnetic materials that
may be magnetized.
2-2
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c
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f. Return diskette to envelope when removed from FDD.
g. Protect diskette from liquids, dust, and metallic substances at all times.
h. Do not exceed the following storage environmental conditions:
Temperature: 50° to 125°F (10° to 56. 1°C)
Relati ve Humidity: 8% to 80%
Maximum Wet Bulb: 85°F (29. 4°C)
i. Diskettes should be stored in a box or cabinet when not in us e.
o
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INSTALLATION AND CHECKOUT 3
G 3.1 INTRODUCTION
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This section provides the information and procedures necessary to put an FDD into
operation.
3.2 UNPACKING
Unpack FDD as follows:
a'. Cut banding and lift top half of styrofoam shell from unit.
b. Lift unit in polyethylene bag from bottom half of styrofoam shell and remove unit
from polyethylene bag.
During unpacking, care must be used so that any tools being used do not inflict damage
to the unit. As a unit is unpacked, inspect it for possible shipping damage. All claims
for this type of damage should be filed promptly with the carrier involved. If a claim
is filed for damages, save the original packing materials.
3.3 INSTALLATION
Install the FDD in the designated location in the host equipment.
3.4 CABLING AND CONNECTIONS
Connect the AC cable, 'I/O cable, and DC cable if applicable between the FDD and
host equipment.
3.4.1 INPUT-OUTPUT CABLE
The maximum cable length from connector to connector is 25 feet. All inputs and
outputs require pairs, one line for function, one for ground. The characteristic
impedance is typically 120 ohms.
The information relative to the I/O connector (Jl) and pin/signal assignments are
defined in Table 5-1, Figure 5-2, and Figure 5-3.
On models designed for daisy-chain operation, the terminating resistor pack RMI
(See Figure 5-3) is to be installed in the end FDD (farthest from the controller) ONLY.
Terminators in more than one FDD during daisy-chain hookup may result in damage to
the controller.
For daisy-chain configurations, W32, W33, and W34 determine the FDD position in
the daisy-chain. W32 is used with the door unlock option. Therefore, to change the
position of the FDD in the daisy-chain, the jumpers must be unsoldered and moved to
the desired location, see Figure 5-3B. Optionally switch 81 (S2 if door unlock option
is included) is provided on the circuit board to enable changing the position of the FDD
in the daisy-chain by switch selection.
77834769-A
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3.4.2 DC POWER CONNECTION
DC power (user-supplied) for standard FDD models is transmitted from the controller
via the I/O cable through the interface connector (Jl) ont he printed circuited board.
Daisy-chain FDD models receive DC power (user-supplied) through a power cable which
interfaces w.ith its mating connector (J7) on the printed circuit board. The pin assign~
ments and line functions are shown on sheets 1 and 6 of the schematics, Figure 5-2. The
mating connector is described in Figure 5-3.
3.4.3 AC POWER CONNECTION
The AC Power Cable (CDC PiN 75292202 or equivalent - see Figure 3-1) is an optional
item supplied on order. The cable consists of stranded wire, 18 AWG minimum with
center pin connection utilized as frame ground. Refer to Figure 3-1 for connector part
numbers and attachment.
3.5 ENVIRONMENT
Operating and storage environments of the FDD are as follows:
Operating: 50° to 100°F (10° to 38°C) 12 of (-II°C)/hr max. fluctuation
. 20% to 80% relative humidity
(providing there is no condensation)
Non-Operating: ~
-30° to +150°F (-35° to 65°C)
5% to 95% relative humidity
(providing there is no condensation)
Max. Wet Bulb 80°F (27°C)
3.6 INITIAL CHECKOUT
This procedure should be used to determine that FDD is operational. The procedure
assumes that the unit is installed and the I/O and power cables are connected.
a. Apply ac power to unit and visually check that the spindle rotates.
b. Apply dc power to unit.
c. For Daisy-Chain FDD models using dipswitch SI or S2 instead of jumpers W32,
W33,
and W34: .
1. Close one of the Unit Select switches (dip switch positions 1,2, 3, or 4) located
on the circuit board.
2. Close one of the Ready switches (dip switch positions 5,6,7, or 8) located on
the circuit board.
3. If the Door Unlock option is installed, close one of the Door Unlock switches (dip
switch positions 9, 10, 11, or 12) located on the circuit board.
d. Insert diskette as described in Section 2.
e. Apply a head-load-command signal to the unit and close the access door. Check
that the head-load solenoid actuates, and the door microswitch is actuated.
f. Apply a stepping-command signal to the unit and check that the actuator steps the
head as commanded.
g. Remove diskette.
h. Remove the command signals and power from the unit.
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77834769-A
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3.6.1 OPERATING FREQUENCY
If the required operating frequency is different than that which the unit is configured, the
procedure for converting operating frequencies using the dual diameter reversible pulley
is provided in Section 6, "Frequency Conversion" for applicable models.
PLUG:
AMP PN 1-480700-0
MPI PN 83435302-1
CONTACTS: (SOCKET)
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CABLE CONNECTOR
MATING PLUG
RECEPTICLE:
AMP PN 1-480701-0
MPI PN 83435402-8
AMP PN 350536-1 (STRIP)
AMP PN 350550-1 (LOOSE)
MPI PN 83435507-5
CONTACTS: (PIN)
AMP PN 350547-1 (LOOSE)
AMP PN 350218-1 (STRIP)
MPI PN 83435501-8 (STRIP)
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AC CABLE (75292202)
RECEPTICLE ON
FDD ASSEMBLY
Figure 3-1. AC Cable Assembly
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LINE
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