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CORVUS SERVICE-Manual THE CORVUS SERVICE-MANuAL -- , ~ CORVUS SYSTEMS --- --~ 11 and 20 Megabyte'Drive ***CORVUS SYSTEMS * * ' 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 ..,l1n.. , tho Dvrl",,; ...... n ...... r l;n'\;bnrm nf irnnlipfi \AT;:\rr;:\nnpo;: nr li<lhilitlp", for inciopntal 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 (408) 559-7000 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 IM® is a registered trademark of Digital Research Inc. Apple,® Apple n® and Apple II Plus® are registered trademarks of Apple Computers, Inc. TRS-80® and Radio Shack® are registered trademarks of Tandy Corporation. SuperBrain ® is a registered 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 a registered 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 J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference. 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. 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 TRS-80®ff PAGE 53, section 9.3 Delete II Apple II +," insert II 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 a Drive . .. 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 Ca hies . .. 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 I!' 'TUrnDV nr nDrD "'TTnlll. T ....... A.A ...... .&. .& ............ v .&.&.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 Paddle board PCA . .. 30 5.9 Interface PCA . .. 30 CHAPTER 6 - DISASSEMBLY 6.1 Scope of Chapter ..........................................................................
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