Seagate ST82038J User manual

c5S)> Seagate
.................. ...........
Sabre Disc Drive
.............................
ST82038J, ST82272J
.... ...... ...................
ST82500J!K/NIND, ST83050K
... ..........................
ST83073J, STB3220K
.......... ............ .......
Maintenance Manual
.............................
(All Interfaces)
.............................

WARNING
(For all drives)
Do not attempt to install, operate, or repair the unit, before you read the important safety information
located directly after the preface in this manual. Failure to follow thatand other safety precautions in
this manual could cause injury to yourselfor others.
WARNING
(For ST82038J, ST82272J, ST82500J/K/N/ND drives)
This equipment generates, uses and can radiate radio frequency energy and if not installed and used in
accordance with the instructions manual, may cause interference to radio communications. It has been
tested and found to comply with the limits for aClass Acomputing device pursuant to Subpart J of Part
15 ofthe FCC Rules which are designed to provide reasonable protection against such interference when
operated ina commercial environment. Operation ofthis equipment in a residential area is likely to
cause interference in which case the user, at his own expense, will be required to take whatever measures
may be required to correct the interference.
If the operator orstatus/control panel (component assembly) is not installed in the inner drawer, it is your
responsibility to provide any additional RFI shielding or grounding needed to ensure FCC Class A
compliance.
WARNING
(For ST830SOK, ST83073J, ST83220K drives)
This equipment generates, uses and can radiate radio frequency energy and, if not installedand used in
accordance with the user's manual, may cause interference to radio communications. It has been tested
and found to comply with the limits for a Class Acomputing device pursuant to Subpart B ofPart 15 of
the FCC Rules which are designed to provide reasonable protection against such interference when
operated in a commercial environment. This device must not cause harmful interference; itmust accept
any interference received, including interference that may cause undesired operations.
Operation ofthis equipment in a residential area is likely to cause interference in which case the user, at
his own expense, will be required to take whatever measures may be required to correct the interference.
Any unauthorized modifications to this equipment could result in revocation ofthe user's authority to
operate the equipment. The subsystem must use shielded I/O cables and must meet the grounding
requirements defined in the user's manual.
Ifthe operator or status/control panel (component assembly) is not installed in the inner drawer, it is your
responsibility to provide any additional RFI shielding or grounding needed to ensure FCC Class A
compliance.

Sabre Disc Drive
ST82038J
ST82272J
ST82500J
ST82500K
ST82500N
ST82500ND
ST83050K
ST83037J
ST83220K
Maintenance Manual
(All Interfaces)
General Maintenance Information
Trouble Analysis
Repair and Replacement
Publication Number: 83327230, Rev. A

Seagate Disc Drive Product Numbers
Seagate Technology
Form Factor
4 = 5.25 inch (FH)
6 = 9 inch
8 = 8 inch
Unformatted Capacity (in Megabytes)
Copyright Notice
Interface
J SMD-0/E
K = IPI-2
N = SCSI
ND = Diff erentia:
SCSI
Seagate, Seagate Technology, and the Seagate logo are
registered trademarks of Seagate Technology, Inc. This
publication is copyrighted with all rights reserved and may not
be copied, in whole or in part, without written permission of
Seagate Technology, Inc.
Seagate reserves the right to change product offerings or
specifications without notice.
Publication Number: 83327230
Revision: A
Date: April, 1991
© 1991
By Seagate Technology, Inc.
Technical Publications Department
12701 Whitewater Drive
Minnetonka, MN 55343
We value your comments. A comment sheet is provided at the
back of this manual.
Printed 1n the United States of America
f-2
83327230 A

Preface
Configuration Chart
CONTENTS
Important Safety Information and Precautions
Abbreviations
1. GENERAL MAINTENANCE INFORMATION
Introduction
Electrostatic Discharge Protection
Maintenance Tools and Materials
Testing the Drive
Field Test Units
Drive Diagnostics
System Software
Accessing Assemblies for Maintenance
2. TROUBLE ANALYSIS
Introduction
Drive Power on Test
Voltage Checks
Troubleshooting Procedures
TSPl - Power Check
TSP2 - Voltage Fault Check
TSP3 - First Seek Check
TSP4 - Seek Check
TSPS - Write Check
TSP6 - Read Check
TSP7 - Address Mark Check
Diagnostic Testing
General
Test Selection Procedure
83327230 A
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1-1
1-1
1-3
1-3
1-3
1-4
1-4
1-5
2-1
2-2
2-4
2-5
2-8
2-10
2-14
2-15
2-16
2-18
2-19
2-20
2-20
2-22
f-3

Test Descriptions
Test 00 Display Drive Operating Status Log
Test 01 Display Fault Log
Test 04 Calculate Three Most Likely Field
Replaceable Units
Test 05
Servo Test
Test
06 Clear
Drive
Operating Status Log
Test
07 Clear Fault Log
Test
08 Direct or continuous Seeks
Test 09
Random Seek
Test
oc
Display EPROM Part Number
Test OE Return to Zero
Test
12
Sequential
Test
2F
I/0
Drive Status Codes
Interface Testing
Test
one-Track
Testing SMD Interface Drives
Testing SCSI Interface Drives
I/O Board Self-Test
INQUIRY Command
Seeks
RECEIVE DIAGNOSTIC RESULTS Command
Additional Length Bytes
FRU Code
Error Code
Reading the I/O Board LEDs on SCSI Drives
Testing !PI Interface Drives
The Self-Test and Initialization Sequence
Execute Internal Diagnostics Function
Read Drive Specific Information (Bus Control
3. REPAIR AND REPLACEMENT
Introduction
3101 - Drawer Removal & Replacement
Removal
Replacement
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43)
2-23
2-24
2-25·
2-26
2-27
2-27
2-28
2-28
2-29
2-29
2-29
2-30
2-30
2-31
2-38
2-38
2-39
2-39
2-41
2-43
2-44
2-44
2-44
2-46
2-48
2-48
2-51
2-51
3-1
3-4
3-4
3-4
83327230 A

3102 - Top Cover Removal & Replacement
Removal
Replacement
3103 - Front Panel Removal & Replacement
Drives With Status/Control Panel
Removal
Replacement
Drives With Operator Panel
Removal
Replacement
Drives Without Status/Control Panel or Operator Panel
Removal
Replacement
3201 - Drive Removal & Replacement
Removal
Replacement
3202 - Status/Control Panel Removal & Replacement
Removal
Replacement
3203 - Operator Panel Removal & Replacement
Removal
Replacement
3204 - Power Supply Removal & Replacement
Removal
Replacement
3205 - Module Removal & Replacement
Removal
Replacement
3206 - Fan Removal & Replacement
Removal
Replacement
3301 - I/O Board Removal & Replacement
SMD I/O Board Removal
SMD I/O Board Replacement
SCSI I/O Board Removal
83327230 A
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3-6
3-7
3-8
3-8
3-8
3-9
3-10
3-10
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3-13
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3-20
3-20
3-20
3-22
3-22
3-23
3-24
3-24
3-24
3-24
f-5

SCSI I/O Board Replacement
IPI I/O Board Removal
IPI I/O Board Replacement
3302 - Control Board Removal & Replacement
Removal
Replacement
A. ALTERNATE MOUNTING METHODS
Introduction
Using the Standard Rack Mounting Kit
Inner Drawer Removal & Replacement
Removal
Replacement
The Power Supply On/Standby Switch
1-1
2-1
2-2
2-3
2-4
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
FIGURES
Component Locator
Example of Troubleshooting Procedure
Switches and Indicators
Example of LCD (Liquid Crystal Display)
Power on Self-Test
Drawer Replacement
Top Cover Replacement
Front Panel Replacement For Drives With
Status/Control Panel
Front Panel Replacement For Drives With Operator
Panel
Front Panel Replacement For Drives Without
Status/Control Panel or Operator Panel
Drive Replacement
Status/Control Panel Replacement
Operator Panel Replacement
Power Supply Replacement
3-25
3-26
3-26
3-28
3-28
3-28
A-1
A-1
A-2
A-2
A-3
A-4
1-6
2-7
2-20
2-32
2-49
3-5
3-6
3-8
3-10
3-13
3-15
3-16
3-17
3-18
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83327230 A

3-10
3-11
3-12
3-13
3-14
3-15
1-1
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
Power
Supply Voltage
Conversion
Module Replacement
Fan Replacement
I/0 Board Replacement
(SMD and
I/0
Board Replacement
(!PI)
Control Board Replacement
TABLES
Maintenance Tools and Materials
Power on Test Failure
SCSI)
DC Voltage Distribution
switch/Indicator Descriptions
Summary of Diagnostic Tests
Coding of Field Replaceable Units
Drive Status Codes
SMD-E Online FRU Codes
Typical Inquiry Data
Diagnostic Data Return Bytes
SCSI Online FRU Codes
Error Codes
I/0 Board LEDS on SCSI Drives
Native-Controlled Diagnostic Status Codes
Native-Controlled Diagnostic FRU Codes
Native-Controlled Diagnostic Fault Codes
Interface-Controlled Diagnostic Status Codes
Interface-Controlled Diagnostic FRU Codes
Interface-Controlled Diagnostic Fault Codes
83327230 A
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3-22
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3-27
3-29
1-2
2-3
2-5
2-21
2-23
2-26
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2-44
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2-55
2-55
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2-57
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f-7

PREFACE
This manual contains maintenance information for the Seagate
Sabre disc drives listed in the configuration chart following
the preface. It is prepared for customer engineers and other
technical personnel directly involved with maintaining the
drive.
The information in this manual is presented as follows:
Section 1 - General Maintenance Information. contains
information on warnings and precautions.
maintenance tools and materials. testing the
drive. and accessing the drive for maintenance.
Section 2 - Trouble Analysis. Contains procedures and
information to assist in troubleshooting the
drive.
Section 3 - Repair and Replacement. Contains procedures and
information on the replacement of drive
assemblies.
Appendix A - Alternate Mounting Methods. Provides additional
information on installation.
New features, technical changes. additions. and deletions in
this manual are indicated as follows:
• A vertical bar in the outer margin of a page marks the
changed area.
• A dot by the page number indicates the entire page
contains new or changed information.
• A vertical bar by the page number indicates the
information was moved from another page, but there were
no technical or editorial changes.
83327230 A
f-9

The following Sabre manuals are available for purchase from:
Seagate Technology, Inc.
customer Services
12701 Whitewater Drive
Minnetonka, MN 55343
Phone: [phone]
Fax: [phone]
Publication No. Title
83327200 ST82038J, ST82272J, ST82500J and ST83037J
SMD Interface User's Manual (contains
general description, installation.
operation. and diagnostic information for
drives with the SMD interface.)
83327210 ST82SOOK, ST830SOK and ST83220K !PI
Interface User's Manual (contains general
description. installation. operation, and
diagnostic information for drives with the
IPI interface.)
83327220 ST82SOON SCSI Interface User's Manual
(contains general description, installation.
operation. and diagnostic information for
drives with the SCSI interface.)
83327230 Maintenance Manual
83327240 Parts Data Manual (contains listings of
field replaceable parts. and manufacturer's
recommended spare parts)
83327390 Pocket Reference (summarizes status codes
and diagnostic operation for drives with the
SCSI interface)
83327380 Pocket Reference (summarizes status codes
and diagnostic operation for drives with the
SMD and IPI interfaces)
83327530 Theory Manual
f-10 83327230 A

You can obtain more detailed information about the interfaces
described in this manual by requesting a copy of the interface
specification from your Seagate sales representative. The
following specifications are available.
Specification No. Title
64712402 SMD-E Interface Specification
64721701 Interface Specification for the Seagate
Small Computer System Interface (SCSI)
64400300 Specification for synchronized Spindle
Systems
64731600 Seagate Specification for the IPI-2
Intelligent Peripheral Interface
ISO 9318-2 Device Specific Command Set for Magnetic
Disc Drives (IPI-2)
ISO 9318-6 Enhanced Physical Level (IPI)
83327230 A f-11

CONFIGURATION CHART
The following is a list of drives that this manual applies to:
Equipment
Model Data Capa-
Number Number
lnterf ace
city (GB)
Sector Length
PA8F2A ST82038J Dual Channel SMD 2.038 Unspecified
PA8J2A
ST82272J Dual Channel SMD 2.272 Unspecified
PA8J3A
ST82272J Not Supplied 2.272 Unspecified
PA8T2A ST82500J Dual Channel SMD
2.500 Unspecified
PA8T2B ST82500J Dual Channel SMD
2.500 Unspecified
PA8T3A
ST82500J Not Supplied 2.500 Unspecified
PA8UlA
ST82500ND SCSI Differential 2.500
512 Bytes
PA8UlB
ST82500N SCSI Single-Ended 2.500 512 Bytes
PA8UlC
ST82500ND SCSI Differential 2.500 256 Bytes
PASUlD
ST82500N SCSI Single-Ended 2.500 256 Bytes
PA8V2A ST82500K
!Pl 2.500 Standard
PA8V2B ST82500K
!Pl 2.500 Standard
PA8V2C
ST82500K
!Pl 2.500 Standard
PA8V2D
ST82500K !Pl 2.500 Standard
PA9A2A ST83220K
!Pl 3.220 Standard
PA9A2B ST83220K
!PI 3.220 Standard
PA902A ST83073J Dual Channel SMD
3.073 Unspecified
PA902B ST83073J Dual Channel SMO
3.073 Unspecified
PA9G2A ST83050K
IPI 3.050 Standard
PA9G2B
ST83050K IP! 3.050 Standard
f-12
83327230 A

IMPORTANT SAFETY INFORMATION
AND PRECAUTIONS
Use of proper safety and repair techniques is important for
safe, reliable operation of this unit. service should be done
only by qualified persons. We recommend the procedures in this
manual as effective ways of servicing the unit. Some
procedures require the use of special tools. For proper
maintenance and safety, you must use these tools as recommended.
The procedures in this manual and labels on the unit contain
warnings and cautions that must be carefully read and followed
to minimize or eliminate the risk of personal injury. The
warnings point out conditions or practices that may endanger
you or others. The cautions point out conditions or practices
that may damage the unit, possibly making it unsafe for use.
You must also understand that these warnings and cautions are
not exhaustive. We cannot possibly know. evaluate, and advise
you of all the ways in which maintenance might be performed or
the possible risk of each technique. Consequently, we have not
completed any such broad evaluation. If you use a non-approved
procedure or tool. first ensure that the method you choose will
not risk either your safety or unit performance.
For the safety of yourself and others. observe the following
warnings and precautions.
• Perform all maintenance by following the procedures in
this manual.
• Follow all cautions and warnings in the procedures and on
unit labels.
• Use the special tools called out in the procedures.
• Use sound safety practices when operating or repairing
the unit.
• Use caution when troubleshooting a unit that has voltages
present. Remove power from unit before servicing or
replacing parts.
• Wear safety glasses when servicing units.
• Wear safety shoes when removing or replacing heavy parts.
• Use only designated Seagate replacement parts.
Non-Seagate replacement parts can adversely affect safety
in addition to degrading reliability, increasing
maintenance downtime, and voiding warranty coverage.
83327230 A
f-13

• Use care while working with the power supply because line
voltages are always present when the ac power cord is
connected to a power source. Setting the power supply
switch to position •• 6" disables de power to the drive
but has no effect on ac power within the supply. For
complete safety, remove the ac power plug from the site
power outlet.
• The site power outlet shall be installed near the
equipment and shall be easily accessible.
• In case of fire or other emergency, isolate the drive
from main power by removing the drive power plug from the
ac outlet. In situations where pulling the plug is not
possible or practical, use the system main power
disconnect to isolate the drives from main power.
• In an IT power system, a disconnect device shall be
provided which simultaneously interrupts all phase and
neutral conductors.
• WARNING: In IT power systems. the unearthed neutral is
considered as a phase conductor. For such IT power
systems, double pole/neutral fusing is required.
• When the drive is mounted in an equipment rack or
cabinet, ensure that the internal temperature of the rack
or cabinet will not exceed the limits defined for the
drive. Where units are stacked vertically, pay special
attention to the top where temperatures are usually
highest.
• This drive is designed to be installed and operated in
accordance with UL19SO, IEC380, IEC9SO, EN 60950,
CSA C22.2 154, CSA C22.2 220, and VDE0806.
• Follow the precautions listed in section 1 under
Protecting the Drive From Electrostatic Discharge.
• If the power supply is placed on a bench for testing,
position the supply so all ventilation holes are open, to
allow proper air flow to internal components.
• Do not attempt to disassemble the module. It is not
field repairable. Replace the entire module assembly if
it is defective.
• Do not operate the drive over an extended period of time
without the top cover installed.
• The power supply is designed to be connected to an IT
network.
f-14 83327230 A

• Do not attempt to disassemble the power supply. It is
not field repairable. Replace the entire supply if it is
defective.
• If you do not use a recommended Seagate power supply,
ensure the supply meets the specifications in this manual
and is designed to be used in accordance with UL1950,
IEC380, IEC950, EN 60950, CSA C22.2 154, CSA C22.2 220.
and VDE0806.
• Always deenergize drive before removing or installing
circuit boards. cables, or any other electrical
components.
83327230 A
f-15

ABBREVIATIONS
ABV
ac
ALT
BIB
BLW
BOB
c
CDIC
Above
Alternating Current
Alternate
Bus In Bit
Below
Bus out Bit
Celsius, Continuous
controller/Drive
Interface Chip
CH Channel
cm Centimetre
CONTD Continued
CYL Cylinder
D Direct
de Direct current
DIAG
Diagnostic
DMA Direct Memory Access
ECC Error Correction Code
ECL Emitter Coupled Logic
ECO Engineering Change
Order
83327230 A
EPROM Eraseable
Programmable Read
Only Memory
ESP Enhanced SCSI Protocol
EXEC Execute
EXT External
FCO Field Change Order
FRU Field Replaceable Unit
FTU Field Test Unit
GND Ground
HEX Hexagon. Hexadecimal
HP High Performance
Hz Hertz
IBP Inhibit Block Pulse
IC Integrated Circuit
ID Identification
!DENT Identification
INT Internal
I/O Input/Output
IP!
Intelligent
Peripheral Interface
LCD
Liquid Crystal Display
f-17

ABBREVIATIONS (CONTD)
LED
LSB
LSI
Light Emitting Diode
Least Significant Bit
Large Scale
Integration
LTD Lock to Data
LUN Logical Unit Number
MAC
Merged Architecture
Controller
MB Megabyte
MHz Megahertz
MPU Microprocessor Unit
MSB Most Significant Bit
NRZ Non Return to Zero
ns
p
PFTU
PROC
RAM
REF
REV
f-18
Nanosecond
Plug
Programmable Field
Test Unit
Procedure
Random Access Memory
Reference
Reverse. Revision
RST
Reset
RTZ Return to Zero
R/W Read/Write
s Second
SBC SCSI Bus Controller
S/C series Code
SCSI Small Computer
Systems Interface
SEL Select
STD Standard
SYNC
synchronization
TP Test Point
TSP
TTL
v
W/
W/0
WRT
2HP
Troubleshooting
Procedure
Transistor-Transistor
Logic
Volts. Voltage
With
Without
Write
Two-Head Parallel
83327230 A