PRIAM FOURTEEN INCHWINCHESTERDISK DRIVES User manual

IPRifAM
FOURTEEN INCH
WINCHESTER
DISK DRIVES
OEM/SERVICE MANUAL
Mt\RCH 15 J 1982
*******
:~ R ELI MIN ARY
* * * * * * *
.:REV~SED September 20, 1982

PRIAM
14-INCH WINCHESTER DISC DRIVES
FIELD SERVICE MANUAL
~RCH 15 J 1982
* * * * * * *
PRE LIM I NARY
*******
REVISED September 20, 1982

PRIAM 14" Disc Drives
PREFACE
Field Service Manual
December 21, 1981
This manual has been prepared for the benefit of field service personnel
who are directly involved with the installation and maintenance of PRIAM
14-inch disc drives. It may also contain information helpful to the OEM
manufacturer of products containing these drives.
In producing this manual, PRIAM has sought to provide enough information to
enable the following field operations to proceed smoothly and efficiently:
Preparation, including provision for compatibility of related
equipment, proper power, and cabling.
Installation and initial testing.
Fault isolation to the assembly level.
Assembly replacement.
The manual contains enough theory of operation to give the reader a general
background on how the drive works. This is intended solely to provide a
context for the testing and troubleshooting procedures. It is not intended
that the manual should enable the reader to do detailed intra-board
troubleshooting or board repair.
i

PRIAM 14" Disc Drives
TABLE OF CONTENTS
Section
Field Service Manual
December 21, 1981
Page
1
1 • 1
1
.2
1 .3
1 .3. 1
1.3.2
1 .4
1 .4. 1
1
.4.2
1 .4.3
1 .4.4
2
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
3
3.1
3.2
3.3
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
GENERAL INFORMATION
FEATURES
SPECIFICATIONS
CONFIGURATION
Physical Configuration
Functional Organization
OPTIONS
Interface Options
Interface Cables and Terminators
Power Supplies and Cables
Mounting Hardware
INSTALLATION
UNPACKING
VISUAL INSPECTION
JUMPERS
SWITCH SETTINGS
MOUNTING
GROUNDING
CABLING
UNLOCKING
PERFORMANCE CHECK
LOCKING
REPACKING
STORAGE
SHIPPING
OPERATING PROCEDURES
SPINDLE AND HEAD LOCKS
POWERING UP/DOWN
PERFORMANCE CHECK
ASSEMBLIES
OVERVIEW
HEAD DISC ASSEMBLY
PHOTOCELL ASSEMBLY
MOTOR CONTROL ASSEMBLY
MAIN PCB
POWER SUPPLY
FRAME ASSEMBLY
ii

PRIAM 14" Disc Drives
Section
Field Service Manual
December 21, 1981
Page
5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
FORMATS
OVERVIEW
SERVO SURFACE
SERVO PATTERN
SERVO SURFACE
SERVO PATTERN
DATA SURFACE
SECTOR FORMAT
NON-QUADRATURE
NON-QUADRATURE
QUADRATURE
QUADRATURE
6 ELECTRICAL CIRCUIT OPERATION
6 • 1 OVERVIEW
6.2 DRIVE SELECTION
6.3 POWER UP/DOWN SEQUENCES
6.4 MOTOR CONTROL CIRCUITRY
6.5 SEEK MODES
6.6 SERVO CIRCUITS
6.7 DATA READ/WRITE FUNCTIONS
6.8 PLO/VFO
6.9 MICROPROCESSOR FLOW CHARTS
7TROUBLE SHOOTING PROCEDURES
7.1 FIELD ADJUSTMENTS AND PREVENTIVE MAINTENANCE
7.2 GENERAL INSPECTION
7.3 STATUS AND ERROR CODES
7.4 SYMPTOMS AND CAUSES
7.5 SEEK ERRORS AND FAULT CONDITIONS
8ASSEMBLY REPLACEMENT PROCEDURES
8.1 PRECAUTIONS
8.2 HEAD DISC ASSEMBLY
8.3 PHOTOCELL ASSEMBLY
8.4 MOTOR CONTROL ASSEMBLY
8.5 MAIN PCB
8.6 POWER SUPPLY
9 SPARE PARTS LIST
10 PRIAM INTERFACE
10.1 OVERVIEW
10.2 CONNECTORS AND PIN ASSIGNMENTS
10.3 INTERFACE SIGNAL DESCRIPTIONS
10.4 INTERFACE DC CHARACTERISTICS
10.5 INTERFACE TIMING
10.6 USER-ACCESSIBLE REGISTERS
10.7 COMMANDS
10.8 REGISTER BIT DEFINITIONS
11 SMD INTERFACE
11.1 OVERVIEW
11.2 CONNECTORS AND PIN ASSIGNMENTS
11.3 INTERFACE SIGNAL DESCRIPTIONS
11.4 INTERFACE DC CHARACTERISTICS
11.5 INTERFACE TIMING
iii

PRIAM 14" Disc Drives
LIST OF FIGURES
Field Service Manual
December 21, 1981
Figure
1.3-1
1.3-2
2.4-1
2.4-2
2.4-3
2.8-1
5.1-1
5.3-1
5.5-1
6.1-1
6.4-1
6.6-1
6.7-1
6.7-2
6.7-3
6.9-1
6.9-2
6.9-3
6.9-4
6.9-5
6.9-6
6.9-7
6.9-8
6.9-9
6.9-10
6.9-11
10.4-1
10.4-2
10.4-3
10.4-4
10.4-5
10.5-1
10.5-2
10.5-3
10.5-4
10.5-5
10.5-6
10.5-7
10.5-8
10.5-9
Title
Physical Configuration of aPRIAM 14-inch Disc Drive
Simplified Block Diagram of aPRIAM 14-inch Disc Drive
Main PCB (PRIAM Interface, "B" Drive)
Main PCB (SMD Interface)
Main PCB (B-4 Interface)
Location of Head and Spindle Locks
Servo and Data Surfaces
Servo Track Signals Non-Quadrature
Servo Track Signals -- Quadrature
Simplified Block Diagram of aPRIAM 14-inch Disc Drive
Motor Controller
Servo Circuitry
Read/Write Timing and Encoding
Data Write Circuitry
Data Read Circuitry
Initialization Flow Chart
Idle Flow Chart
Command Detect Flow Chart
Sequence Up Flow Chart
Sequence Down Flow Chart
Restore Flow Chart
Seek Operation Flow Chart
Track Crossing Flow Chart
Land and On Track Flow Chart
Seek End Flow Chart
Fault Reset Flow Chart
DBUS Transceiver
Single End Line Receiver Gated by DRIVE SELECT
Single End Line Receiver
Single End Line Driver
Differential Line Drivers and Receivers
Register Load Timing
Register Read Timing
Reset Timing
INDEX and SECTOR MARK Timing
WRITE DATA and WRITE CLOCK Timing
READ DATA and READ CLOCK Timing
Record Writing Timing
Record Reading Timing
Read and write Transitions During Gaps
iv
Page

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
Figure
11.4-1
11.4-2
11.4-3
11 .5-1
11.5-2
11.5-3
11.5-4
11.5-5
11.5-6
11.5-7
11.5-8
Title
Typical Read/Write Data and Clock Transmitter and Receiver
Control Line Transmitter
Control Line Receiver
Tag and Bus Timing
Typical Read Timing
Typical Read Control Timing
Typical Write Control Timing
Index and Sector Mark
Drive Select Timing
NRZ Data and Read Clock Timing
Recommended Sector Format
Page
LIST OF TABLES
Table
1.2-1
2.4-1
10.2-1
10.3-1
10.3-2
10.4-1
10.4-2
10.4-3
10.4-4
10.4-5
10.4-6
10.5-1
10.5-2
10.5-3
10.5-4
10.5-5
10.5-6
10.5-7
10.5-8
10.6-1
10.7-1
10.7-2
10.8-1
10.8-2
11 .2-1
11.2-2
11.2-3
Title
Specifications for PRIAM 14-inch Disc Drives
Switch Settings on the Main PCB
Interface Connector
Head Selection
Drive Fault Conditions
DBUS Transceiver DC Characteristics
Single End Line Receiver Gated by DRIVE SELECT
DC Characteristics
Single End Line Receiver DC Characteristics
Single End Line Driver DC Characteristics
Differential Line Receiver DC Characteristics
Differential Line Driver DC Characteristics
Register Load AC Characteristics
Register Read AC Characteristics
Reset AC Characteristics
INDEX and SECTOR MARKAC Characteristics
WRITE DATA and WRITE CLOCK AC Characteristics
READ DATA and READ CLOCK AC Characteristics
Record Writing Control AC Characteristics
Record Reading Control AC Characteristics
Register Selection
Command Code Summary
Drive ID Assignments
Status Register Bit Definitions
Address Register Bit Definitions
Tag Bus I/O Interface ("A" Cable)
Tag Bus Decode ("A" Cable)
"B" Cable Interface
v

PRIAM 14" Disc Drives
Field Service Manual
SECTION 1 - GENERAL INFORMATION .
December 21, 1981
PRIAM
14-inch Winchester disc drives are available in three models,
providing a range of storage capacities, as shown in the following table:
Model Number
DISKOS 3350
DISKOS 6650
DISKOS 15450
1.1 FEATURES
Megabytes
34
68
158
Discs
2
Data Heads
3
3
7
Tracks/Inch
480
960
960
The advantages offered by the 14-inch family of disc drives include:
1. High Storage Capacity
2. Low Cost per Megabyte
3. High Performance
4. High Reliability
5. Relatively Small Size
6. Universal Power Compatibility
7. Ease of Interfacing
The above advantages are achieved through a combination of design features,
as described in the following paragraphs:
1. High storage capacity is achieved by using the larger (14")
disc size, in conjunction with high recording and track
densitites.
2. Low cost per megabyte is achieved by using efficient and
cost-effective methods throughout the entire design,
manufacturing, and marketing process.
3. High performance is achieved through the use of fully
servoed, linear voice coil head positioning. This makes
possible the high precision and stability needed in order to
utilize the higher recording and track densities. It also
enables the fast access times necessary for efficient use of
the larger data bases.
4. High reliability is achieved through the use of a fully
sealed, positive pressure air filtering system, servoed
spindle speed and head positioning systems, cast metal head
disc assembly, efficient cooling system, and microprocessor
implementation of control functions.
1- 1

PRIAM 14" Disc Drives Field Service Manual
December 21, '1981
5. Overall size is kept small by designing the various
assemblies in the proper relationships to one another. The
(optional) power supply is designed so that it can fit inside
the standard frame. Thus aPRIAM 14-inch disc drive with the
power supply included does not require much more space than a
standard size 8-inch drive with a separate power supply. All
three drives in the PRIAM 14-inch family have identical
overall dimensions. Standard rack mounting can be used.
6. Power compatibility is assured through the use of all DC
components, including a DC spindle motor. Even when the
built in power supply option is selected, PRIAM drives can
still be used anywhere in the world, since the power supply
input can be strapped to accomodate any of the prevailing
I ine voltages.
7. Ease of interfacing is assured by the availability of several
different interfaces, including a PRIAM standard interface, a
PRIAM
SMD interface, and an ANSI interface. Each of these
has been designed in relation to an entire class of existing
computer hardware. Virtually any bus now in use can be
accomodated by one PRIAM interface or another. See the
section on Options (below) for a complete listing.
1.2 SPECIFICATIONS
Table 1.2-1 summarizes the operating characteristics, physical
characteristics, and power requirements for the three drives in the PRIAM
14-inch family.
1.3 CONFIGURATION
1.3.1 Physical Configuration
Figure 1.3-1 shows the overall physical configuration for the DISKOS 3350,
6650, or 15450.
Functional Organization
Figure 1.3-4 is a simplified block diagram showing the relationships among
the major functional units in a PRIAM 14-inch disc drive.
1-2

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
Table 1.2-1. Specifications for PRIAM 14-inch Disc Drives
OPERATING CHARACTERISTICS DISKOS
3350
Capacity (unformatted) 33.9 Mbytes
Transfer rate (megabytes/second) 1.04
Track-to-track seek time (typical) 8 msec
Average seek time (typical) 45 msec
Maximum seek time (typical) 85 msec
DISKOS 6650
67.8 Mbytes
1.04
8 msec
45 msec
85 msec
DISKOS 15450
158.2 Mbytes
1.04
8 msec
40 msec
75 msec
Average latency
Tracks per inch
Bits per inch
Number of data surfaces
Number of data cylinders
Nominal RPM
Bytes per track
POWER REQUIREMENTS
9.7 msec
480
6430
3
561
3100
20,160
9.7 msec
960
6430
3
1121
3100
20, 160
9.7 msec
960
6430
7
1121
3100
20,160
Power requirements are the same for all three drives:
Maximum Typical
+
24 VDC
(~5%)
7.0
A 6.0 A seeking
4.5
A non-seeking
+5
VDC
(~5%)
4.0 A*
1.5
A
-5
VDC
(~5%)
2.0
A1
.0
A
-12
VDC
(~5% )
0.7
A 0.5
A
*
6.0 Amaximum
with adapters
DIMENSIONS
physical dimensions are the same for all three drives:
Height
6.9
inches
Width 16.6
inches
17.6
inches
with slides
Depth
20.0 inches
Weight*
52 pounds
(3350 and 6650)
55 pounds
(15450)
* Includes 18 pounds for power supply. Add 6 pounds for slides.
1-3

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
SPINDLE
LOCK
Lever Positioned Towards }
Drive Casting=Spindle Locked ~
Lever Positioned Away From
Drive Casting=Spindle Unlocked
Locked
Position
CARRIAGE/HEAD
LOCK
L ~ ! .__ ~ J,
Figure 2.8-1. Location of Head and Spindle Locks
o
CARRIAGE LOCK
SPINDl.E LOCK
4 2S
RIGHT
2. 25-!~ -=~=!
r
17 56
BOTTOH
r I'L G
(POWER SUPPLY OPTION)
WI
SLIDE OrTION
16.56
I
[C
Zc
BACK
OWER
U -
Tor
8-32 UNC-2B
5..PLACES
Figure 1.3-1. Physical Configuration of aPRIAM 14-inch Disc Drive
1-4

PRIAM 14" Disc Drives Field Service Manual December 21, 1981
-DRIVE
SELECT
-RD PARALLEL
SERVO CIRCUITS
-WR
INTERFACE
+ADO
(Sequencing
t
HEAD POSITIONER
status and
1--,....
+ADI
.A
...
other circuits)
[8-BIT BUS
~
(tri-state)
JII"
",
Select and Control
Signals
DISC
DATA READ/WRITE
HEADS
t>--J ::-
~
0..,0'
SERVO READ
I.-
&
~
SERVO HEAD
R/W CIRCUITS
.
SPINDLE ASSEMBLY
(Brushless
DC motor,
speed control
circuits)
-HEAD SELECT
SERIAL
*(NRZ) READ CLOCK
-WRITE GATE
INTERFACE
*(NRZ) READ DATA
*WRITE CLOCK (NRZ)
(Data handling
-INDEX MARK
*WRITE DATA (NRZ)
circuits
t
Index
-SECTOR MARKS
and Sector Mark)
-READ GATE
(NRZ) WRITE CLOCK
*designates differential signals.
Figure 1.3-2. Simplified Block Diagram of aPRIAM 14-inch Disc Drive
1-5

PRIAM 14" Disc Drives
1.4 OPTIONS
1.4.1 Interface Options
Field Service Manual
December 21, 1981
The PRIAM 14-inch disc drives are available with a variety of interface
options. Each of these interface options can be used, without
modification, on any disc drive in the 14-inch family. All PHIAM
interfaces include on-board data separation.
The standard PRIAM Interface is designed for low cost and for efficient use
with microprocessor-based systems. Up to four drives may be daisy-chained,
when this interface is used. The PRIAM interface provides a basic 8--bit
bidirectional bus, which may be used with the currently popular 8-bit and
16-bit :microprocessors. It also provides bit-serial NRZ data exchange. No
elaborate handshaking protocols are required. The PRIAM interface is built
into the disc drive's main PCB. A 50-conductor flat ribbon cable is used
between the PRIAM interface and the host system. See the PRIAM INTERFACE
section for more details.
The SMD Interface permits aPRIAM drive to be used with existing Storage
Module Drive (SMD) controllers. In the 14-inch drives the SMD interface is
built into the disc drive's main PCB. The line drivers and line receivers
in the SMD interface are matched to those of typical SMD controllers.
There are two interface cables between the host system's SMD controller and
the PRIAM disc drive's SMD interface -- a 60-conductor twisted-pair flat
cable ("A" cable) and a 26-conductor flat ribbon cable ("B" cable). See
the SMD INTERFACE section for more details.
The ANSI Interface complies with the disc drive interface standard proposed
by ANSI Technical Committee X3T9. Characteristics of the ANSI interface
include variable and fixed sector sizes, data transfer rates up to 10
megabits per second, and radial attention and select capability. Up to
eight drives may be daisy-chained, on a single 50-conductor flat ribbon
cable. See the ANSI INTERFACE section for more details.
1.4.2
Interface Cables and Terminators
I/O cables are available from PRIAM, for connecting the user's controller
to the PRIAM disc drive, and for connecting daisy-chained drives to one
another.
Terminators are available for I/O signal lines, to minimize reflections and
to ensure maximum data integrity. One set of terminators is required for a
single drive, or for the base drive in a daisy chain.
1-6

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
1.4.3 Power Supplies and Cables
PRIAM's optional power supply allows PRIAM disc drives to operate from 100,
120, 220, and 240 VAC, 50 or 60 Hz power. The optional power supply is
delivered already mounted within the drive frame. No extra space or
interconnection is required.
1.4.4 Mounting Hardware
Optional slides are available from PRIAM. These slides allow easy access
to drives mounted in standard racks and cabinets.
1-7

PRIAM 14" Disc Drives
Field Service Manual
SECTION 2 - INSTALLATION
December 21, 1981
The disc drive is packaged to withstand normal handling in a reusable
shipping container. It is the customer's responsibility to notify the
carrier if shipping damage should occur to the drive. Any insurance
protection is also the customer's responsibility.
When the shipment is received, the shipping container should be examined
for obvious signs of shipping damage. Most insurance adjusters require an
inspection of the damaged container. Notify the carrier and PRIAM Customer
Service immediately, if shipping damage is discovered.
2.1 UNPACKING
The disc drive is shipped with an outer and an inner carton. Open the
outer carton by cutting the tape on the top side. Remove the inner carton
and open it by cutting the tape.
Remove the disc drive from the carton and place it on a clean, flat work
surface. Remove the wrap.
2.2 VISUAL INSPECTION
Visually inspect the drive for loose, bent, or broken parts. Report any
damage to the carrier and to PRIAM Customer Service.
2.3 POWER SUPPLY SETUP
If aPRIAM optional power supply is present, check the AC voltage selection
circuit board prior to applying power. This board is adjacent to the AC
input plug, and is an integral part of the power supply. To select a
voltage, remove the selection circuit board and reinsert it so that the
proper AC voltage designation (100, 120, 220, or 240) is visible. Also
check the fuse value. A5 ampere fuse is used with 100 or 120 VAC, while a
Z.5ampere fuse is used with 220 or 240 VAC. No modification is required for
changing from a 60 Hz power source to a 50 Hz power source, or vice versa.
2.4 SWITCH SETTINGS
The drive address, write protect parameters, and sector size are all switch
selectable. The switches are located on the main PCB. Referring to
Figures 2.4-1, 2.4-2, and 2.4-3, and to Table 2.4-1, set the switches
according to the desired operating condit~ons.
2-1

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
~-j--.,
, I
: J3 :
II
L ~
SERVO
POWER
AMP
SERVO
CIRCUITS
r- --------,
: P.O.R. I
I POWER/ :
: RESET :
LoJ
B
r-----,
, I
I J4 :
I I
I ,
L -'
MOTOR CONTROL
PO\o,TER SUPP1.¥
r--- - - - - - - - - - - - -
I
I
I
I
I
I
"NOT GND"
CONTROL
LOGIC
&
INDEX
C 32 DATA
C 31 DATA
GUARDBAND
BEJ
CIRCUITS
R!W I
SERVO
DIVISION BAR
:
I
,..---------"'1
I I
I I
I I
: PLO :
I I
~ J
I
I
I
I
I
,..----------1
I I
II
: VFO I
I :
l __ ---------1
I
I
I
I
I
I
L.
1
Bt]
&
READ
WRITE
CIRCUITS
OPEN
DATA
WINDOW
ADJUST
t
I
I
I
I
I
I
I
I
I
~
I
I
I
I
MARKING I
______ / AREA I
~ ! /)
oI ;,"
~ I ,,"
I ,,'
I ",'
------ ~ /
C,-/
Figure 2.4-1. Main PCB (PRIAM Interface, "B" Drive)
2-2

PRIAM 14" Disc Drives Field Service Manual December 21, 1981
MOTOR CONTROL
I POWER SUPPLY
t D_ATA .19 _~
DATA Jl
~l
: Jl~ :
L~_J
r--
l-
.,
: J3 !
,'
L..- __ J
DATA J2
INTERFACE
CONTROL r-=l
J.8
PANEl ~
BB
8
B
MARKING
AREA
-----1
"'l I
("'; a.--
oI
I
I
___ J
DIVIDER BAR
DATA 8
WINDOW R32
ADJUST
I
,
~-------,
: I
, I
I PLO :
,,
, I
1-.___ '
I
,
I
,
I
r-----,
:P.O.R. :
: POWER/ :
: RESET :
~---------- ..
INDEX
GUARDBAND
CIRCUITS
SERVO
CIRCUITS
,..-- --- -- ------
: SERVO
: PO\\!ER
I ANP
r------
I
I
I
I
I
!~
,
I
I
I
&
CIRCUITS
r1
I ,
I
VFO ,
II
I ,
~-----~1
I
t
,
,
,
I
L-1 s~,~o I
BE]
&
WRITE
READ
Figure 2.4-2. Main PCB (SMD Interface)
2-3

PRIAM 14" Disc Drives
Field Service Manual
December 21, 1981
MOTOR CONTROL
I pm,TER SUPPl
-----"1I
"%j ,
8 l..-- MARKING
~: AREA
1
------_-1
J9 DATA
CONTROL
PANEL
INTERFACE
o READY
o FAULT
CJ1
DATA
CJ2
DATA
EJ
rJ --,
I I
l J3 :
I I
L. .J
EJ
B
PARTITIO~ BAR
CIRCUITS
INDEX
SERVO
pm,'ER
AHP
r--------,
: P.O.R. I
: POhTER/ :
I RESET :
LJ
SERVO
CIRCUITS
~-----------------
I
I
I
I
I
I
r- ---- - __ J
&
GUARDBAND
GB
I
I
I
r---------l
I ,
I ,
: PLO :
II
t------ .I
I
I
I
,
I
,..----------1
I I
I I
: VFO :
, I
, I
L-----------l
I
I
I
I
,
I
I
LJ R/w I
I SERVO ,
&
READ
WRITE
DATA
WINDOW
ADJUST
Figure 2.4-3. Main PCB (B-4 Interface)
2-4

PRIAM 14" Disc Drives
Field Service Manual
15450 SPLIT PRIAM 200208
December 21, 1981
~
J
I :~f
13
: W1
~
dt;f 9F
W2 •
•
15450 SPLIT SMD
200218 &200263
~
J
~
J
C3
~
2E
10E
off
off
Ba aC
W4
•
~
A
••
• WI
W3
•
0••
W2
2-4.1