Seagate ST8741J User manual

Sabre Disc Drive
ST8741JIN, ST8851JIN
ST81123J, ST81154K OKO-Sol.
ST81236JIK!N t);co..!'~t
Maintenance Manual
(All Interfaces)
--r----------c55)> Seagate

WARNING j
Do not attempt to install, operate, or repair the unit,
before you read the important safety information located
directly after the table of contents in this manual.
Failure to follow that and other safety precautions in this
manual could cause injury to yourself or others.
WARNING j
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 a Class A computing device
pursuant to Subpart J of Pa,rt 15 of the FCC Rules which are
designed to provide reasonable protection against such
interference when operated in a commercial environment.
Operation of this 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 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.
KOR 0756

~
I
r
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Sabre Disc Drive
ST8741J (97200-736)
ST87 41 N (97201-736)
ST8851J (97200-850)
ST8851 K (97209-850)
ST8851 N (97201-850)
ST81123J (97200-11G)
ST81154K (97229-11G)
ST81236J (97200-12G)
ST81236K (97209-12G)
ST81236N (97201-12G)
Maintenance Manual
(All Interfaces)
General Maintenance Information
Trouble Analysis
Repair and Replacement
Publication Number: 83325720-F
CS)> Seagate

REVISION RECORD
I
REVISION DESCRIPTION I
~~~~~~.L-~~~~--~~~~~~~~~~~~~~~~~~I
01
(02-09-B7)
02
(04-22-B7)
A
(05-29-B7)
B
(12-14-B7)
c
(OB--12- BB)
D
(Ol-23-B9)
E
(OB-09-B9)
F
(03-29-90)
Prereleased. Information in this edition is I
subject to change without notice. I
Revised to move theory of operation section to I
publication B3325690. I
Manual released. This edition obsoletes all I
previous editions. I
Manual revised to document B50 MB and 1230 MB I
drives, IPI interface, voltage converter, I
technical and editorial changes. All but most I
basic electrical checks removed, and Repair & I
Replacement moved to section 3. 'This edition I
obsoletes all previous editions. I
Manual revised to document 1120 MB drives and I
1230 MB SCSI drives. Technical and editorial I
!changes. This edition obsoletes all previous I
I
editions. I
!Manual revised to document 1153 MB IPI I/O two- I
lhead parallel drives and SMD I/O drives with \
!voltage converters. Technical and editorial I
!changes. This edition obsoletes all previous I
I editions. I
!Manual revised to add air baffle and Error Codes I
lfor SCSI High Performance drives. Technical and I
!editorial changes. This edition obsoletes all I
!previous editions. I
!Editorial changes only. I
I I
I I
I I
I I
I I
~~~~~~-'-~~~~~~~--~~~~~~~~~~~~~~~~~!
REVISION LETTERS I, 0, Q AND X ARE NOT USED.
© 19B7,BB,B9,90
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 in the United States of America
f-2
B3325720 F
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83325720 F
f-3

PREFACE
This manual contains maintenance information for the Seagate
PA8XX SABRE eight-inch module drive. 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.
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.
The following manuals apply to the SABRE and are available from:
83325720 F
Seagate Technology. Inc.
Customer Services
12701 Whitewater Drive
Minnetonka. MN 55343
Phone: [phone]
Fax: [phone]
f-5

Publication No.
83325660
83325690
83325700
83325710
83325720
83325730
83325810
83325860
83326010
83327150
83327160
Title
Reference Card (summarizes status codes and
diagnostic operation for drives with the SMD
and IPI interfaces)
PA8XX Theory Manual
PA8XX Parts Data Manual (contains listings
of field replaceable parts, manufacturer's
recommended spare parts, and accessories)
PA8Gl/PA8G2/PA8Kl/PA8K2/PA8Nl/PA8N2/PA8W2
User's Manual (contains general description,
operation, installation and checkout
information)
PA8XX Maintenance Manual
PA8XX Diagrams Manual
Reference card (summarizes status codes and
diagnostic operation for drives with the
SCSI interface)
PA8Hl/PA8Ll/PA8Pl/PA8P3 User's Manual
(contains general description, operation,
installation and checkout information)
PA8M2/PA8R2/PA8Y2 User's Manual (contains
general description, operation, installation
and checkout information)
Special Supplement (applies to PA8K2D)
Special supplement (applies to half-rack
mounting kit)
For more information about the interfaces described in this
manual, you can request copies of interface specifications from
your Seagate sales representative. The following specifications
are available:
Specification No. Title
f-6
64712402 SMD-E Interface Specification
64721701 Interface Specification for the MPI small
Computer System Interface (SCSI)
64731600
Interface Specitication for IPI-2
Intelligent Peripheral Interface
83325720 F

~ The following table lists the drives covered by this manual:
Equipment
Data Ca pa-
Number
Interface
city (MB)
sector Length
PA8GlA Single Channel SMD 736
Unspecified
PA8G2A
Dual Channel SMD 736
unspecified
PA8G2C* Dual
Channel SMD 736
Unspecified
PA8G2D
Dual Channel SMD
736
unspecified
PA8HlA STD SCSI (Differential)
736 512
Bytes
PA8HlB STD SCSI
(Single-ended)
736
512
Bytes
PA8HlC STD SCSI
(Differential)
736 256
Bytes
PA8HlD STD SCSI
(Single-ended)
736 256
Bytes
PA8HlE STD SCSI (Differential) 736 512
Bytes
PA8KlA Single Channel SMD 850
unspecified
PA8K2A
Dual Channel SMD 850
unspecified
PA8K2D Dual Channel SMD
850
Unspecified
~
PA8K2E* Dual Channel SMD 850
Unspecified
\ PA8K2F*
Dual Channel SMD 850
unspecified
PA8K2H Dual Channel SMD 850
Unspecified
PA8K2J Dual Channel SMD
850
Unspecified
PA8LlA STD SCSI (Differential)
850
512
Bytes
PA8LlB STD SCSI (Single-ended)
850
512
Bytes
PA8LlC STD SCSI (Differential)
850
256
Bytes
* This drive has an optional voltage converter to permit
operation with a power supply providing fewer output
voltages than the standard supply.
Continued
83325720 E
f-7

Equipment
Interface
Data Capa-
Sector Length
Number
city (MB)
PABLlD STD
SCSI
(Single-ended)
850 256
Bytes
PABLlE
STD SCSI (Differential) 850
512 Bytes
PA8LlK STD
SCSI (Single-ended) 850
512
Bytes
PA8M2A
IPI 850 Std Format
PA8M2B
IPI
850
512 Bytes
PA8M2C
IPI 850 1024 Bytes
PA8M2D
IPI 850 Std Format
PA8NlA Single
Channel SMD
1230
Unspecified
PABNlB Single
Channel SMD 1230
Unspecified
PA8N2A Dual Channel
SMD 1230
unspecified
PA8N2B* Dual Channel
SMD 1230
Unspecified
PABN2C
Dual Channel
SMD 1230
Unspecified
PA8N2D Dual
Channel SMD 1230 Unspecified
PA8N2E
Dual Channel
SMD 1230 Unspecified
PA8N2F
Dual Channel
SMD 1230
Unspecified
PA8N2G
Dual Channel
SMD 1230
Unspecified
PA8PlA
HP SCSI
(Differential) 1230 512
Bytes
PA8PlB
HP SCSI
(Single-ended) 1230 512
Bytes
PA8PlC
HP SCSI
(Differential) 1230 256
Bytes
PA8PlD
HP SCSI
(Single-ended) 1230 256 Bytes
PA8PlE
HP SCSI (Differential)
1230 512
Bytes
PA8PlF
HP SCSI
(Differential) 1230 512 Bytes
PA8PlG
HP SCSI (Differential)
600 256
Bytes
PABPlH
HP SCSI
(Single-ended) 1230 512
Bytes
Continued
f-8
83325720 E

~
\
Equipment
Interface
Data Capa-
Length
Number city
(MB)
Sector
PA8P3A HP
SCSI (Differential) 1230 256
Bytes
PA8P3B HP
SCSI (Differential) 1230
512
Bytes
PA8P3C
HP SCSI
(Differential) 1230 256
Bytes
PA8P3D HP
SCSI (Differential) 600 512
Bytes
PA8R2A !PI
1230 Std Format
PA8R2B IP!
1230 512
Bytes
PA8R2C !PI
1230
1024 Bytes
PA8R2D !PI
1230
288 Bytes
PA8R2E
IP!
1230
2308 Bytes
PA8W2A Dual
Channel SMD 1120 Unspecified
PA8W2B*
Dual Channel SMD 1120 Unspecified
PA8W2C
Dual
Channel SMD 1120
Unspecified
PA8W2D
Dual Channel SMD 1120 Unspecified
PA8Y2A
!PI {2-Head Parallel) 1153
83325720 E
f-9

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I
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,I"'
CONTENTS
Important Safety Information and Precautions
Abbreviations
1. GENERAL MAINTENANCE INr'ORMATION
Introduction
Electrostatic Discharge Protection
Maintenance Tools and Materials
Testing the Drive
Field Test Units
Drive Diagnostics
System Software
Identifying Test Points
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
TSP5 - Write Check
TSP6 - Read Check
TSP7 - Address Mark Check
Diagnostic Testing
General
Test Selection Procedure
83325720 E
f-17
f-19
1--1
1-1
1-3
1-3
1-3
1-4
1-4
1-5
1-6
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-11

Test Descriptions
Test oo 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
Test
07
Clear Fault
Log
Test 08 Direct
or Continuous
Seeks
Test 09
Random seek
Test OC
Display EPROM
Test OE
Return to Zero
Test 2F
I/0
Test
Drive Status Codes
Interface Testing
Part
Testing SMD Interface Drives
Testing SCSI Interface Drives
I/O Board Self-Test
Inquiry Command
Number
Receive Diagnostic Results command
Additional Length Bytes
FRU Code
Error Code
Log
Reading the I/O Board LEDs on Standard SCSI Drives
Reading the I/O Board LEDs on High-Performance SCSI
Drives
Testing IP! Interface Drives
The Self-Test and Initialization Sequence
Starting the Tests
Execute Internal Diagnostics Function
Read Drive Specific Information (Bus control 43)
3. REPAIR AND REPLACEMENT
Introduction
3101 - Top Cover Removal & Replacement
Removal
Replacement
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
2-38
2-38
2-39
2-39
2-41
2-43
2-44
2-44
2-44
2-48
2-52
2-53
2-54
2-54
2-55
2-55
3-1
3-4
3-4
3-7
f-12 83325720 E

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I
3102 - Entire Drive Removal & Replacement
Removal
Replacement
3103 - Front Panel Removal & Replacement
Removal
Replacement
3201 - Fan Removal & Replacement
Removal
Replacement
3202 - Operator Panel and Status/Control Panel Removal &
Replacement
Removal
Replacement
3203 - Power Supply Removal & Replacement
Removal
Replacement
3204 - Module Removal & Replacement
Removal
Replacement
3301 - 1/0 Board Removal & Replacement
Removal
Replacement
3302 - Control Board Removal & Replacement
Removal
Replacement
3303 - Voltage Converter Removal & Replacement
Removal
Replacement
Test Points
Component Locator
FIGURES
1-1
1-2
2-1
Example of Troubleshooting Procedure
83325720 E
3-8
3-8
3-9
3-12
3-12
3-14
3-16
3-16
3-16
3-18
3-18
3-21
3-22
3-22
3-24
3-25
3-25
3-25
3-26
3-26
3-29
3-30
3-30
3-30
3-32
3-32
3-32
1-5
1-8
2-7
f-13

2-2
2-3
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
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
f-14
switches and Indicators
Example of LCD (Liquid Crystal Display)
Top Cover Removal and Replacement
Drive Removal & Replacement
Front Panel Removal & Replacement
Fan Removal and Replacement
Operator Panel or Status/Control Panel
Replacement
Power Supply Removal & Replacement
Power Supply Voltage Conversion
Typical I/O Board Removal and Replacement
Control Board Removal & Replacement
Voltage converter Removal & Replacement
TABLES
Maintenance Tools and Materials
Power on Test Failure
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
Standard SCSI Error Codes
High-Performance SCSI Error Codes
1/0 Board Leds on High-Performance SCSI Drives
Native-Controlled Diagnostic Status Codes
Native-Controlled Diagnostic FRU Codes
Native-Controlled Diagnostic Fault Codes
2-20
2-31
3-5
3-10
3-13
3-17
3-19
3-23
3-24
3-27
3-31
3-33
1-2
2-3
2-5
2-21
2-23
2-26
2-31
2-39
2-41
2-43
2-44
2-45
2-46
2-52
2-57
2-58
2-58
83325720 E
~
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!

2-17
2-18
2-19
Interface-Controlled Diagnostic Status Codes
Interface-Controlled Diagnostic FRU Codes
Interface-Controlled Diagnostic Fault Codes
83325720 E
2-59
2-60
2-60
f-15

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.
83325720 F
f-17

ABBREVIATIONS (Contd)
LSB
LSI
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
RST
f-20
Nanosecond
Plug
Programmable Field
Test Unit
Procedure
Random Access Memory
Reference
Reverse. Revision
Reset
RTZ
Return to Zero
R/W
Read/Write
s second
SBC SCSI Bus Controller
S/C
SCSI
Series Code
small Computer
Systems Interface
SEL Select
STD Standard
SYNC
TP
TSP
TTL
v
W/
W/0
WR'l'
2HP
synchronization
Test Point
Troubleshooting
Procedure
Transistor-Transistor
Logic
Volts. Voltage
With
Without
Write
Two-Head Parallel
83325720 E
·.~

r 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.
83325720 F
f-17

•
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 (CJ) 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.
• 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.
• 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 IEC380, IEC435, VDE805, VDE806.
•
Follow the precautions listed under Electrostatic
Discharge Protection in section 1 of this manual.
• 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.
• If the power supply is connected to an IT network, ensure
that the input voltage is limited to 230 volts.
• Do not attempt to disassemble the power supply. It is
not field repairable. Replace the entire supply if it is
defective.
• Always deenergize drive before removing or installing
circuit boards, cables, or any other electrical
components.
• If you do not use a recommended Imprimis power supply,
ensure that the supply meets the specifications in this
manual and is designed to be used in accordance with
IEC380, IEC435, VDE805, VDE806.
f-18 83325720 E
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)

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
EMD
Engineering Change
Order
Eight-Inch Module
Drive
83325720 E
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
1/0 Input/Output
IPI
Intelligent
Peripheral Interface
LCD Liquid Crystal Display
LED
Light Emitting Diode
f-19