CORVUS 11MB User manual

THE CORVUS SERVICE-MANuAL
11 and20 Megabyte',Drive
***CORVUSSYSTEMs
** '

II/20MB Drive Service Manual
ERRATA SHEET
DISCLAIMER OF ALL WARRANTIES &LIABILITIES
Corvus Systems, Inc. makes no warranties, either expressed or implied, with respect to this
manual
or with respect to the software described in this manual, its quality, performance,
merchantability, or fitness for any particular purpose. Corvus Systems, Inc. software is sold or
licensed" as is:' The entire risk as to its quality or performance is with the buyer and not Corvus
Systems, Inc., its distributor, or its retailer. The buyer assumes the entire cost of all necessary
servicing, repair, or correction and any incidental or consequential damages. In no event will
Corvus Systems, Inc.
be liable for direct, indirect, incidental or consequential damages, even if
Corvus Systems, Inc. has been advised of the possibility of such damages. Some states do not
..,l1nu, tho Dvrl",,; ...... n ...... r l;n'\;bnrm nf irnnlipfi \AT;:\rr;:\nnpo;; nr liahilitip", for incidpntal or
~~~sequential damages, so the above limitati~n may not apply to you.
Every effort has
been made to insure that this manual accurately documents the operation and
servicing of Corvus products. However, due to the ongoing modification and update of the
software along with future products, Corvus Systems, Inc. cannot guarantee the accuracy of
printed material after the date of publication, nor can Corvus Systems, Inc. accept responsibility
for errors or omissions. -
NOTICE
Corvus Systems, Inc. reserves the right to make changes in the product described in this
manual at
any time without notice. Revised manuals and update sheets will be published as
needed and may be purchased by writing to:
*
**
CoRVUS
Corvus Systems, Inc.
2100 Corvus Drive
San Jose, California 95124
[phone]
Telex 278976
This manual is copywrited and contains proprietary information. All rights reserved. This
document may not, in whole or in part be copied, photocopied, reproduced, translated or
reduced to any electronic medium or machine readable form without prior consent, in writing,
from Corvus Systems, Inc.
Copyright© 1982
by Corvus Systems, Inc. All rights reserved.
Mirror® patent pending, The Corvus Concept,'" Transporter,'" Corvus OMNINET,'"
Corvus
Logicalc,'" Time Travel Editing,'" EdWord,'" Constellation,'" Corvus,'" Corvus Systems,'" Personal
Workstation,'" Tap
Box,'" Passive Tap Box,'" Active Junction Box,'" Omninet Unit'" are trademarks
of Corvus Systems, Inc.
CP/M® is aregistered
trademark of Digital Research Inc.
Apple,® Apple
II® and Apple II Plus® are registered trademarks of Apple Computers, Inc.
TRS.,.80® and Radio Shack® are registered trademarks of Tandy Corporation.
SuperBrain®is aregistered
trademark of Intertec Data Systems, Inc.
DEC,® LSI-11,® RL01 ® and RL02® are registered trademarks of Digital Equipment Corporation.
UCSD PASCAL'" is a
trademark of the Regents of the University of California.
IBM® is aregistered trademark of IBM Corporation.
Z-80®
and Z-80A®are registered trademarks of Zilog, Inc.
FCC WARNING
This equipment generates, uses, and can radiate radio frequency energy and if not installed and
used in accordance with the instruction manual, may cause interference to radio
communications. As temporarily
permitted by regulation it has not been tested for compliance
with the limits for Class A computing devices pursuant to Subpart Jof Part 15 of FCC Rules,
which are designed to provide reasonable protection against such interference. Operation of
this
equipment in aresidential 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.
ERRATA
PAGE 10,
section 4.3
Delete "Omninet," insert "Corvus OMNINET"'''
PAGE 45, section 8.3.6.1
Delete "Superbrain;' insert "SuperBrain®"
Delete
"Superbrain and TRS-80;' insert "SuperBrain® and TR5-80®"
PAGE 53, section 9.3
Delete" Apple II +," insert" Apple II Plus®"

CORVUS DEALER SERVICE
CORVUS SYSTEMS
11MB AND 20MB
EIGHT-INCH WINCHESTER
DISK DRIVE
SERVICE MANUAL
This document contains three types of notations. These are, in increasing order of importance, NOTE,
CAUTION, and WARNING. The NOTE indicates some action to be taken to speed or simplify a
procedure.
The CAUTION indicates that potential damage to the equipment or user data exists, and
care should be taken to avoid this. The WARNING indicates that potential harm or injury to the
service technician or operator exists, and extreme care should be taken to avoid these.

CORVUS DEALER SERVICE
TABLE OF CONTENTS

CORVUS DEALER SERVICE
TABLE Of CONTENTS
CHAPTER 1 - GENERAL DESCRIPTION
1.1 Scope of Chapter ......................................................................... .. 1
1.2
Introduction 1
1.3 Model Identification. ........................................................................ 1
1.4 Purpose of Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1
1.4.1
Power Supply. .................................................................. .. 1
1.4.2
Data Backup. ................................................................... .. 2
1.5
Corvus Disk System. .......... .. .. ...................... ... . . ... . . . . ... . . .. . . . . . . ... .. . .. .. 2
1.6
Winchester Technology. . . . . . . . . . . . . . . . . . . .. . . . . . . .. ............ .. . . . . .. .. . .. . .. ... .. . .. . .. .. 2
CHAPTER 2 - INSTALLATION
2.1 Scope of Chapter. ........................................................................ .. 3
2.2
Introduction 3
2.3 Receiving aDrive .........................................................................
.. 3
2.3.1 Headlock
Mechanisms 3
2.3.2 Diagnostic
Test. ................................................................. .. 4
2.4 Installation
Considerations. ................................................................ .. 5
2.5 Daisy-Chaining
of Disk Drives 6
CHAPTER 3 - OPERATION
3.1 Scope of Chapter 8
3.2
Introduction 8
3.3
Controls. ................................................................................ .. 8
3.3.1
Front Bezel LEOs. . ... ..... .. ... .. ............ .. ... ... . ... . ... ............. ... . . ... 8
3.3.2
Front Bezel Switches. ............................................ .. .............. .. 9
3.4
Power-On Sequence 10
3.5 Environmental
Requirements 10
3.5.1 Static Electricity 10
3.5.2 Line Noise. ..................................................................... .. 10
3.5.3
Temperature 10
3.6 Periodic
Maintenance 10
3.6.1 Regular Checks
11
3.6.2 Groundstrap 11
CHAPTER 4 - DRIVE DESCRIPTION
4.1 Scope of Chapter ....................................................................... .. 12
4.2
Introduction .12
4.3
Power Supply 12
4.3.1
CSI00 12
4.3.2 CP129 12
4.3.3 CP140 12
4.3.4 CP411 16
4.4 dc
Power CahIes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
4.5 Definition
of Terms 16
4.5.1 Disk Sealed Mechanism 18
4.5.2 Controller Firmware 18
4.5.3 Data
Storage 18

CORVUS DEALER SERVICE
4.5.4 Headlock Devices ................................................................ .. 19
4.5.5
Preamp PCA 19
4.5.6 Drive Electronics Revision 19
4.6
Power- Up 20
ru" D'T'l:D l!' 'TUrt""\DV t""\r t""\DrD "'TTt""\lll. T
...... A.A ...... .&. .& ........... v .&.&& ..... '-'.&'-.a. '-"'JL '-' ............ '-A.a..a..a.'-J .....
5.1 Scope of Chapter 21
5.2 Introduction 21
5.3 Servo Electronics 21
5.3.1 Servo Tracks 21
5.3.2 Servo Control Signals 24
5.3.3 Servo
Operation 24
5.4 Read/Write Electronics
24
5.4.1 Read Operation 25
5.4.2 Write
Operation 25
5.5 Controller/Logic Electronics 26
5.5.1 Host to Drive Handshaking Controi Signais 26
5.5.2 Controller During Seek Command 27
5.5.3 Controller During Read and Write Commands 27
5.6 Backplane /Motherboard PCA 28
5.7
Preamp PCA ............................................................................. .. 28
5.8 Paddleboard
PCA ......................................................................... .. 30
5.9 Interface PCA ............................................................................ .. 30
CHAPTER 6 - DISASSEMBLY
6.1 Scope of Chapter 31
6.2
Introduction 31
6.2.1 Tools Required ..................................................................
.. 31
6.3
Metal Cabinet 31
6.3.1 Top
Cover ...................................................................... .. 31
6.3.2 Rear
Bezel. ..................................................................... .. 31
6.3.3 Backplane
Cover 33
6.3.4 Cabling 33
6.3.5 Drive
Mechanism 33
6.3.6 Power Supply 33
6.3.7 Front Bezel 33
6.4 Stand-Alone Units ..................................................................
.. 33
6.4.1 Disassembly (CSIOO)
33
6.5 Drive Electronics Removal and Disassembly 33
6.5.1
Card Set 34
6.5.2
PCA Replacement 34
CHAPTER 7 - ADJUSTMENTS AND MAINTENANCE
7.1 Scope of Chapter 35
7. 2 Introduction 35
7.3 Power Supply Voltage Check and Adjustment 35
7.3.1 CP140 and CP411 35
7.3.1.1 Voltage Check 35
7.3.1.2 Voltage
Adjustment 36
ii

CORVUS DEALER SERVICE
7.3.2 CS100 36
7.3.2.1 Voltage Check 36
7.3.2.2 Voltage Adjustment 36
7.3.3 CP129 37
7.3.3.1 Voltage Check 37
7.3.3.2 Voltage Adjustment 37
7. 4 Servo Mechanism. ........................................................................ .. 38
7.4.1 Servo Adjustment ASM 310176 and ASM 310221 38
7.4.2 Servo Adjustment ASM 310006 40
7.5 Brake Mechanism 41
7. 5.1 Brake Adjustment ...................... .. 41
CHAPTER 8 - DEALER SERVICE DIAGNOSTICS
8.1 Scope of Chapter ......................................................................... .. 43
8.2 Introduction 43
8.3 Drive Diagnostics RevB 43
8.3.1 CRC 43
8.3.2 EXR
~. 43
8.3.3 UPD 43
8.3.4
VSN 44
8.3.5
FMT 44
8.3.6
PRM 44
8.3.6.1
MUX 44
8.3.6.2 DRIVE 45
8.3.7 SET
45
8.3.8 QUIT 45
8.4
Controller Diagnostic 45
8.4.1
General Description 46
8.4.2 Controller Diagnostic Commands 46
8.4.2.1 A) Abort Diagnostic 46
8.4.2.2 B) Macro Menu 46
8.4.2.3 C) Change Slot Number , 47
8.4.2.4 D) Download Diagnostic 47
8.4.2.5 I) Analyze Servo 47
8.4.2.6 J) Single Do Seek. ................................................... .. 47
8.4.2.7 L) Full Cylinder Loopseek 48
8.4.2.8
P) Print Quiet Summary Report 48
8.4.2.9 Q) Sector Quiet Program 48
8.4.2.10
S) Read Scan Disk ................................................... .. 48
8.4.2.11 nSingle Cylinder Seek Scan 49
8.4.2.12 X) Write Scan Disk 49
8.4.2.13 Y) Rezero Heads 49
8.4.3 Error Codes 49
8.5 Burn-In Program 49
8.5.1
C)ONT 50
8.5.2 L)IST 50
8.5.3 R)ESTART 50
8.5.4 Q)UIT 50
8.6 Read Burn-In Results 50
iii

CORVUS DEALER SERVICE
nri"p ni~on()l:;tirl:; Rpv A
AD] .8.8.1
Track Diagnostic. ......................................................................... .. 51
8.7.1 C)ONT 51
8.7.2 L)IST 51
8.7.3 R)ESTART 51
8.7.4 Q)UIT 51
51
52
RR
8.7
CHAPTER 9 - FAULT ISOLATION PROCEDURES
9.1 Scope of Chapter , . .. 53
9.2 Introduction 53
9.3 Tools .................................................................................... .. 53
9.4 Error Codes. ............................................................................. .. 53
9.4.1 Interpreting Error Codes 53
9.5 Troubleshooting Procedures 57
9.5.1 On-Site Checks 57
9.5.2 Isolate the Problem 57
9.5.3 Drive Not Ready 58
9.5.3.1 Interface 58
9.5.3.2 Controller Firmware .................................................. .. 58
9.5.3.3 Power Supply Voltages ................................................ .. 58
9.5.3.4 RESET Line 58
9.5.3.5 Drive Electronics 59
9.5.3.6 Drive Sealed Mechanism 60
9.5.4 Link Inoperative 60
9.5.4.1 Check Link Action .................................................... .. 61
9.5.4.2 Power Supply 61
9.5.4.3 CRC Test 61
9.5.4.4 Servo Test 62
9.5.4.5 Controller Firmware 62
9.5.4.6 Boot ROM 62
9.5.4.7 Interface Components 62
9.5.4.8 Drive Initialization 62
9.6 Final Adjustments and Tests 62
9.6.1 Proper Headlock Operation ....................................................... .. 62
9.6.2 CRC Test 63
9.6.3 Servo Check and Adjustment 63
9.6.4 Install and Test Mirror 63
9.6.5 RESET Line 63
9.6.6 CRC Test 0 •••••••••••••••••••••••••••••••••••• 63
9.6.7 Power Supply. .................................................................. .. 63
9.6.8 Burn-In Test 63
9.7 Troubleshooting Flowchart 65
9.8 Common Symptoms and Recommended Solutions 66
Appendix A
Appendix B
Appendix C
Appendix D
Glossary. ........................................................................ .. 72
Parts List for Eight-Inch Drives 74
PCA Compatibilities 76
Assembly and Schematic Drawings 77
Index " 144
iv

CORVUS DEALER SERVICE
LIST OF ILLUSTRATIONS AND TABLES

CORVUS DEALER SERVICE
LIST OF ILLUSTRATIONS AND TABLES
ILLUSTRATIONS
Figure Page
2-1 Manual Carriagelock Location. ............................................................. .. 4
2-2
CORCOM Unit. ......................................................................... .. 5
2-3 Rear Bezel
Components , . . . . . . . . . .. . .. ......... .... . .. .. ........... .. 6
3-1
Front Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8
3-2Function Switches ........................................................................ .. 9
4-1 Stand-Alone
Drive with CS100 Power Supply 13
4-2 Stand-Alone
Drive with CP129 Power Supply 14
4-3 White
Cabinet with CP140 Power Supply 15
4-4
Data Configuration. ...................................................................... .. 16
4-5 Disk
Drive Sealed Mechanism. ............................................................. .. 17
4-6 Sector Interleaving 18
4-7 Peamp
PCA Location 20
5-1 Servo Track Relationship 22
5-2 Tri-Bit Signal 22
5-3 Corvus RevB Block Diagram 23
5-4 Read/Write
PCA Jumper Location 25
5-5
NRZ and MFM Data Formats 26
5-6 RevA Cabling 29
5-7 RevB Cabling ............................................................................ .. 29
6-1 Access Door,
Metal Package. ............................................................... .. 32
7-1 dc Power Cable Connection "35
7- 2Drive Configuration for Servicing 38
7-3 PES Signals Improperly and Properly Adjusted 39
7-4 Mechanism Adjustment ................................................................... .. 42
9-1 Location
of R3 59
9-2 PES as Result of Good and Bad Servo Tracks 61
9-3 Checking Proper Headlock Operation ....................................................... .. 64
TABLES
Table Page
1-1 Unit Address Options. .................................................................... .. 7
9-1 Decimal Disk
Error Codes 54
9-2Hexidecimal Disk
Error Codes 55
9-3 Signed Decimal Disk
Error Codes 56
v