NEC D2246 Operating manual

D2246 8-INCH
WINCHESTER DISK DRIVE
MAINTENANCE GUIDE
NEe
NEe Information Systems, Inc.
819-000080-5001 Rev. 00
12-83

LIABILITY DISCLAIMER
NEC InformationSystems, Inc. (NECIS)products are warrantedin accordance with the
terms
of the applicable NEC Information Systems, Inc. product specification. Product
performance
is affected by system configuration, software, the application, customer
data, and operatorcontrol of the system among otherfactors. While NECIS productsare
considered to be compatible with most systems, the
product functional implementation
by customers
of the product may vary.
Therefore, the suitability
of a product for a specific application must be determined by
the customer and
is not warranted by NECIS.
This manual
is as complete and factual as possible at the time of printing; however, the
information in this manual may have been updated since
that time. NEC Information
Systems, Inc. reserves the right
to change the functions, features, or specifications of its
products
at any time, without notice.
NEC Information Systems, Inc. has prepared this document for use by NECIS
employees
and customers. The information contained herein is the property of NECIS
and shall not be reproduced without prior written approval from NEelS.
First Printing -December 1983
Copyright 1983
NEC Information Systems, Inc.
5 Militia Drive
Lexington, MA 02173
Printed in U.S.A.

Contents
Page
Chapter 1 System Overview
1.1 D2246 System Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1
1.2 Disk Circuitry ..................................................... 1-4
1.3 Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-4
1.4 Features .......................................................... 1-4
1.4.1 Enhanced Seek Time .......................................... 1-4
1.4.2 Rapid
Data Transfer Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-4
1.4.3
Compact Mounting ........................................... 1-4
1.4.4 Simplified Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-6
1.4.5 Design Reliability. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. 1-6
1.4.6 Standard Interfaces ........................................... 1-6
1.4.7 Safety....................................................... 1-6
1.4.8 System Configuration Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-6
1.5 Related Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-7
1.6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-7
1.7 Options........................................................... 1-7
Chapter 2 Installation Procedures
2.1 Unpacking/Repacking .............................................. 2-1
2.2 Terminating Resistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-2
2.3
Jumper Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4
2.4 Switch
Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4
2.4.1 Installation Switch Assembly
................................... 2-5
2.4.2
Control Mode Switch Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-6
2.4.3 Sector Select Switch
Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-7
2.5
Cabinet/Rack Installation ........................................... 2-16
2.6 Cable Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 2-16
2.6.1 Interface Cables
.............................................. 2-16
2.6.2 System
Ground Cable ......................................... 2-18
2.6.3 Power Cable
................................................. 2-18
2.7 Lock
Control Assembly .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-18
Chapter 3 Preventive Maintenance and Troubleshooting
3.1 General Maintenance Rules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
3.2 Maintenance Tools ................................................. 3-1
3.3 Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-2
3.4
Troubleshooting........... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-2
3.5 Servo System Signals
................................................ 3-13
3.6 Seek Operations Testing
............................................. 3-18
3.6.1 Repeat Seek Operation
........................................ 3-18
3.6.2 One-Cylinder Seek Operation
................................... 3-18
III

Contents (cont'd)
Chapter 4 Removal and Replacement Procedures Page
4.1 G9QST (Logic and Servo) PCB Removal .............................. 4-1
4.2 G9QSN (Read/Write) PCB Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
4.3 Earth Pad Assembly Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
4.4 G9QSQ (Power Amplifier) PCB
Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
4.5
Motor Stator Assembly Removal ..................................... 4-6
Chapter 5 Adjustments
5.1 Required Tools... . ........ .... . .......................... . .. ....... 5-1
5.2 Servo Offset Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-1
5.3 Seek Speed Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-3
Chapter 6 Illustrated Parts Breakdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-1
Chapter 7 DKUOOO-H3PM 3-Input DC Regulator Option
7.1 General Description....... . .... ....... . ..... .. . ... .... .... . ...... .. 7-1
7.2 Interface Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-2
7.2.1
DC Power Connector (P4) ..................................... 7-2
7.2.2 Signal
Ground Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-3
7.2.3 DC Power Input Requirements ................................. 7-3
7.3 Installing the 3-Input DC Power Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-4
Chapter 8 DKU-HDPI Dual-Port Interface Option
8.1 General Description ................................................ 8-1
8.2 Switches and Indicators ............................................. 8-2
8.2.1 Port A (Route 0) Switches and Indicators. . . . . . . . . . . . . . . . . . . . . . .
.. 8-3
8.2.2 Port B (Route
1) Switches and Indicators. . . . . . . . . . . . . . . . . . . . . . . .. 8-3
8.2.3 Release Timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-3
8.3 Drive Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-3
8.4 Interface .......................................................... 8-4
8.5 Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 8-4
8.5.1 Release
Command ............................................ 8-4
8.5.2 Priority
Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-4
8.6 Installing the Dual-Port
Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-7
Appendix A Schematic Diagrams
A.1 Signal Tracing Scheme .............................................. A-I
A.2 Drawings......................................................... A-I
Appendix B Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-1
IV

Contents (cont' d)
Page
Appendix C DKUOOO-HLOG Diagnostic Panel
C.I Control Panel .. 0 0 000 0 000 000 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 000 0 • 0 0 0 0 0 0 • 0 0 0 •• 0 000 0 0 C-I
Col.1 Keypad 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-4
C.I.2 LED Status Indicators 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-6
C.I.3
LCD Display Window 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-6
C.1.4 Diagnostic Panel Summary Charts 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-6
C.2 Status Mode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-6
C.2.1 Starting Status Mode0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-6
C.2.1.1 Drive Status0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-7
C.2.1.2 Cylinder and Head Addresses 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-ll
C.2.2 Using Status Mode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 •••• 0 •••••••••••• C-II
C.2.3 Ending Status Mode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-II
C.3 Test Mode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-II
C.3.1 Starting Test Mode 00000.0000000000000000000000000000000000000 C-II
C.3.1.1 Input Parameters 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-II
C.3.1.2 Seek Modes 00000000000000000000000000000000000000000000 C-13
C.3.2 Using Test Mode
000000000000000000000000000000000000000000000 C-14
C.3.3 Ending Test Mode
.. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000000000000 C-14
C.4 Log Read Mode
0000000000000000000000000000 o. 0000000000000000000000 C-14
C.4.1
Error/Count Log 000000000000000000000000000000000000000000000 C-14
C.4.2 Sequential Operations Log 0 0 0 0 0
0000 0 0 0 0 0 0 0 0 0 0 0 0 00000 0 0 0 0 0 0 0 0 0 0 0 C-16
C.4.3 Ending Log Read Mode 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C-17
v

Illustrations
Figure Title Page
1-1 D2246 Major Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1
1-2 D2246 Disk and Read/Write Head Arrangement. . . . . . . . . . . . . . . . . . .. 1-2
1-3 D2246 Servo Disk Surface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3
1-4 D2246 Functional Block Diagram ................................ 1-4
1-5 Daisy-Chain System Configuration ............................... 1-6
1-6
Radial System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-7
2-1 D2246 Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
2-2 G9QST Terminating Resistor and Jumper Locations ................ 2-2
2-3 Terminating Resistors in Radial
System. . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-2
2-4 Individual Drive
Termination/Daisy-Chain System. . . . . . . . . . . . . . . . .. 2-3
2-5 Last Drive
Termination/Daisy-Chain System. . . . . . . . . . . . . . . . . . . . . .. 2-3
2-6
DIP Switch Assembly Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4
2-7 Installation
DIP Switch ......................................... 2-5
2-8
Control Mode DIP Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-6
2-9 Sector Select Switch
............................................ 2-7
2-10 Sector Allocation. . . .. . . . . . . .. . ... . .. . . . .. . .. ... . . .. . . .. .. ... . .. 2-7
2-11 Mounting Bracket .............................................. 2-16
2-12 Horizontal
and Vertical Installation ............................... 2-16
2-13 Interface Cable Connections
..................................... 2-17
2-14 Cable
A/Daisy-Chain System .................................... 2-17
2-15 Signal
Ground and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-18
2-16 Lock
Control Assembly ......................................... 2-18
3-1 Troubleshooting Flowcharts ..................................... 3-2
3-2
G9QST Test Point Locations ..................................... 3-13
3-3 Repeat Seek Using
TPI .......................................... 3-18
3-4 One-Cylinder Seek Using
TPI .................................... 3-18
4-1 D2246 Board Cover. . . . . . . . . . .. . .. . . . . . . . .. . . . .. . . . .. .. .. . . .. .. 4-2
4-2
G9QST Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-2
4-3 D2246 Air
Separators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
4-4
G9QSN Cable Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
4-5 G9QSQ Cable
Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5
4-6 D2246
Fan. . . . .. . . . . .. . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . .. . . . . . . .. 4-5
4-7 D2246
Stator Assembly ......................................... 4-6
5-1 Servo Offset and Seek Speed Adjustment Test Points ................ 5-2
5-2 Servo Offset Waveform
......................................... 5-2
5-3 Seek Speed Waveform
.......................................... 5-2
5-4 Transient Response Waveform
................................... 5-3
5-5 Increment Seek (Cylinder 000
to Cylinder 691) Waveform. . . . . . . . . . .. 5-4
6-1 D2246 Standard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-2
6-2 D2246
Head/Disk Enclosure (External Parts) ...................... 6-4
VI

Illustrations (cont' d)
Figure Title Page
7-1 3-Input DC Regulator Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-1
7-2 3-Input DC Regulator Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-2
7-3 P4 Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-2
7-4 Installing the 3-Input
DC Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-4
8-1 Dual-Port System Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-2
8-2 Dual-Port Control Switches and Indicators. . . . . . . . . . . . . . . . . . . . . . .
.. 8-2
8-3 Unit Select Timing for Dual-Port Option .......................... 8-5
8-4 Sample Priority Select Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-6
8-5 Installing the Dual-Port Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8-7
A-I Schematic
Format .............................................. A-2
B-1 D2246 Basic Assembly Dimensions ............................... B-7
B-2 D2246 Standard Assembly Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . .. B-7
B-3 Cable A Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-8
B-4 Cable B Signals ................................................ B-9
C-l Diagnostic Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-2
C-2 Attaching the Diagnostic Panel to the
Drive. . . . . . . . . . . . . . . . . . . . . . .. C-3
C-3 Diagnostic Panel Cable and
Connector. . . . . . . . . . . . . . . . . . . . . . . . . . .. C-3
C-4 Status Mode Display Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-6
C-5 Status Mode
Error Display Format ............................... C-ll
C-6 Low Cylinder Parameter Display ................................. C-12
C-7 High Cylinder Parameter Display
................................. C-12
C-8 Interval Timing Parameter Display ................................ C-12
C-9 Seek Mode Display
............................................. C-13
C-I0 Error/Count Log Display Format ................................ C-15
C-ll Error/Count Log Power-On Count ............................... C-16
C-12
Error/Count Log Error Display Format ........................... C-16
C-13 Sequential Operations Log Display Format ........................ C-17
C-14 Sequential Operations Log Entries
................................ C-17
Vll

Tables
Table Title Page
1-1 DC Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-5
1-2 Available Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-7
2-1 Sector Select Switch Settings (Segment 1 = 0) . . . . . . . . . . . . . . . . . . . . . .. 2-8
2-2 Sector Select Switch Settings (Segment 1 = 1) ....................... 2-12
3-1 Test Point Signal Outputs ....................................... 3-14
3-2 G9QST Servo Signals
........................................... 3-15
4-1 D2246 Field Replaceable Components. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-1
6-1 D2246 Standard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-1
6-2 Head/Disk Enclosure External Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-3
7-1 P4 Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7-3
7-2 DC Power Requirements ........................................ 7-3
A-I Schematic Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-I
B-1 Operating Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-1
B-2 Design Specifications ........................................... B-3
B-3
Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-3
B-4 Interface Cable Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-4
B-5 Power Cable Descriptions ....................................... B-4
B-6 Option Cable Description ....................................... B-4
B-7 Interface Connector Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. B-5
B-8 DC Power Cable Connector Description. . . . . . . . . . . . . . . . . . . . . . . . . .. B-5
B-9 AC Power Cable Connector Description. . . . . . . . . . . . . . . . . . . . . . . . . .. B-5
B-I0 3-DC Option Cable Connector Descriptions. . . . . . . . . . . . . . . . . . . . . . .. B-6
B-ll Operator Panel Cable Connector Descriptions. . . . . . . . . . . . . . . . . . . . .. B-6
C-l Mode Selection Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-4
C-2 Diagnostic Panel
Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-5
C-3 Disk Drive Operational
States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-7
C-4 Drive Status
Reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. C-7
C-5 Seek Modes
................................................... C-13
viii

Abbreviations
A Ampere
ac alternating current
AM Address Mark
AWG American Wire Gauge
CA Cylinder Address
CRC Cyclic Redundancy Check
dc direct current
DE Disk Enclosure
DIP
Dual-inline-packaged
DKC Disk Controller
DKU
Disk Unit
ECC
Error Correction Code
EOR
End of Record
GND
Ground
HA
Head Address
HEX
Hexadecimal
1GB Inner
Guard Band
I/O
Input/Output
LED
Light emitting diode
m meter
MB Megabyte
MFM
Modified Frequency Modulation
MHz Megahertz
mm Millimeter
ms
Millisecond
mV Millivolt
MTBF Mean Time Between Failures
MTTR Mean Time to Repair
NRZ Non-Return-to-Zero
ns Nanosecond
OGB Outer
Guard Band
PCB Printed Circuit Board
PLO Phase Locked Oscillator
RMS Root-Mean-Square
ROM Read only memory
RPM Revolutions per Minute
R/W
Read/Write
SA Sector Address
TTL
Transistor/Transistor Logic
V Volt
f.ls
microsecond