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Corvus 7100-04704 H series drives

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1. Ra KAWA R G AR AR Ave he 38 75 1 CONT rs A T 38 75 2 IOIS T else A 38 7 5 3 RESTART Si DI EE AAA Paid ts ARA gt EE 38 75 4 OIE AA doe BABS BR 39 76 Read 1 Results tai is in a ia 39 77 Track Diagnose ee ee ee eet day ea d smi s aa 39 7 7 1 Rodi cie tet Arai OKE R ao OB A R 39 7 7 2 EINST un SA A IS 39 7 7 3 RESTART aan GOO GooD lc ORA RE BE 40 77 4 OU 1 ETS A A is 40 CHAPTER 8 FAULT ISOLATION PROCEDURES 8 1 8 2 8 3 8 4 8 5 Scope OF Chapter su a Na Reese 41 Introduction ea be va PS Red ub EU c omm ee aa oben 41 Alo PE ETT CTETUR ETE 41 Error Codes eine gt Le E EE 41 8 4 1 Interpreting Error Codes san editae 41 Troubleshooting Procedures ii ae ee E 45 8 5 1 On Site Checks ons se re De ex GK en 45 8 5 2 ls late the Problem ndere 45 8 5 3 Drive Not Ready ser sets O rn yaaa 46 8 5 3 1 Interface Sue i D p dado eL OWA ne ee 46 8 5 3 2 Controller Firmware a PENSA ne uw 46 8 5 3 3 Power Supply Volare an dA 46 8 5 3 4 Drive Electronic ss ee 46 8 5 3 5 Drive Sealed Mechanism ya A esce dap und 47 8 5 4 Link InoperatiVe Ola dana TCR ERN dE A ee 47 8 5 4 1 Check Link eed vase Salica Pat aye d EOS 47 8 5 4 2 Power S
2. Ja 25 __ 7 0245 4 124377 102 1 p _ 12058988 1 27 7 26 2 7RANSISTOR ezwsoss a4 29 3 1251 DIODE zev wecos CRIA 30 7 0256 4 2450 TSOKR 2378 311 le 70252 ov 5201 cren 32 jwevoz73 p ZENER __ 758 33 7 1 2 0006 DIODE ZEWER 752 0 34 1 In2 10608 DIODE ZENER 35 _ 1 60 20 5 SCR BASOV 500853 j i M 7 ed HAS Tremsonne 157 __ 10 2095 cAPAC TORS ELECT 0000 5 01 o 381 promo 1 4 00 85 Worzose 0007355 46 521 0679 5 4 PIN 2 97 02 5920 MZATSINK 17 Ze roR ar 53 12 916 21097 l amp AWG BRN 5 96 21292 WIRE I6AWG WHT 4 Ye x Ya T Ba d M 67 0 4 THIS DRAWING AND THE INFORMATION CONTAINS ARE THE PROPERTY OF ARE BE USED ONLY FOR THE PURPOSE OF MANUFACTURING PAATS FOR IMI jes 9 65 467 MC a A NOTE 5 NLESS RW SE SPECIF
3. po JE ls TE sE 2 880 5 5 E ra 283 58 88 5 290 3 90090 p 5 Lo 12120 23 9 3 DEP 00 g 3 Seif EEE Ox 3 1 3 op 1 7 m 3 lt amp 3 E 5 3 9 5 sum E 1 1 218 50100 in 3 so 5 a 5 DEE il Jas ZES p ZZA RP2 c IMI CONTROLLER 5000H C35 THIS DRAWING AND THE INFORMATION IT CON 62V TAINS ARE THE PROPERTY OF MI AND ARE BE JSED ONLY FOR THE PURPOSE OF MANU TECTURING PARTS FOR IMI MAG PICK UP J25 1 Jes 2 QMAGUPEKUP E q 1 2 LM392 RI 1 2K 154 2 J224 MOTOR TAC i3 12 NAAI ue R38 6 2v LSI4 2 R18 1 2K c2 p sM CRS 2 14148 44 38 44 48 a PN2907 27 2 7 MEG Ri 6 2 L2K 8 8 R7 R8 7 4 1 2K 4 7K 5 1 2 LM392 gt R20 6 4 L2K 2k 1 PN2222 AR 256 5 DEC SPEED INC SPEED un a N CD4020 3 MOTOR 424 18 224 16 2 J24 8 Be F J24 14y S24 11 J24 12 2 POWER LOSS 3 1 6 8 225 33 U2 16 cz ULN 20748 r1 CRE 2 4 5 110 15 13 R6 ISL 25w 5 BB 12645 79 nn M 2 J22 6 C J22 7 8 MOTOR ti2V J22 4 gt MOTOR RET
4. Bere 1 Figure 2 Mirror swilches a Sa 4 Figure 3 Rear bezel ali er EN 5 Figure 4 Controller address switches WA _ 6 Figure 5 Front 626 RD 8 Figure 6 Data onfig Arab OR oe SAA pe auto 11 Figure 7 Drive mechanism components sau A ieh 13 Figure 8 area ae D Den each A pa e A 14 Figure 9 Drive mechanism block diagram 2 reg Vu Drewes a aa 15 Figure 10 Stepper motor assembly ua Hm 17 Figure 11 Read Write PGA TODTOVIl a RE Tod ea AA GZ 22 Figure 12 Motor Control PCA removal u S X WR DEN OCA EO ac SR WO 23 Figure 13 COSTO power supply aid ea 26 Figure 14 Brake mechanism adjustment ana ae a Figure 15 Index Sec A AERE 29 Tables Table 1 Decimal disk daa be 42 2 Hexidecimaldisk erfor 43 Table 3 Signed decimaldiskerror COLES se SI ae 44 CORVUS DEALER SERVICE LIST OF ASSEMBLY AND SCHEMATIC DRAWINGS CORVUS DEALER SERVICE LIST OF ASSEMBLY AND SCHEMATIC DRAWINGS Final Assembly H Dive 60 Base Assembly BGA OB Z 61 Cover Assembly 62 Backplane Assembly H Drive SS kac edt scudo odis 63 6 PS10 Power Supply Assembly cs A rr I RA
5. 2 1 Te J fa es __ __ ____ 263 0238 201 cor ee I I ES PER Er od EMG APIS TRE WEZ REST MORZE Te CHIP 1 EN z J31 4 SEL 2 CHP EN y 21 2 o t HD SEL 2 ur HEAD SELB 331 6 14 HD SEL 22 SHT HEAD SEL AO 13 12 20 222 us SPARE SECTOR 34 7 f IRRE 434 13 f NDEX CLK 434 5 WR FAULT SHT 1 6MB 2 9 ash be Beeps ee ee 9 INDEX SAT 4 z u2 jo INDEX y 11 20 1458 2 d CYL eur 3 8 WRITE FAULT o u Y WRITE FALL 10 40 1438 4 pe READY 492 1438 22 1 DRIVE SELECT SHT 4 3 Ji 8 SHT 1 J33 2 LED RETURN 433 1 STEP A x SHT 1 ATE RWA j sure LFUAVA vel 203 63 LOGIC UNLESS OTHERWISE SPECIFIED sa 9 263 02 20 44 7 eee 2 5 82 c n WEE en ae TP R23 2200 5V 120pF 38 820500 R27 1 0K O C21 C26 10 7 5 3 in 2 oel ICIS ae 12 42 NP a 4 ar 2500 8 27 L R25 R33 R34 R32 R30 5102 5102 5004 500 3300 5024 1 0K RDDATA 2 0 3 1 gt Len m OD RDDATA 2 18 2700 SHT2 DRIVE SELECT 12V R38 2 7K RUG Re
6. ___ _ meee wsBiB 4 SIZE SEL ROE TR e e 4 2 231 22 lt 4 7K ur 10 2 6 REDUCE RESISTANCE 7406 SEEK COMPLETE trem SENSE 2 RPI 9 m WR DISABLE SHT3 J1 34 DIRECTION N 947 8 en REDUCE WR CURRENT rz be 2 READY r 22 ee ee 2 HORIVE SELEC DES ITE FAULT u3 ES SEWRITE GATE Y 3 2 24 d ISK RANA c _ 1514 u vw 172 5 32 7 B CURR 4 467 JA w 26 tps a 2 2 INDEX 27 _ 2 fD ___ gt 32 8 ET A cfe usum e 242 7406 Os ME B C TIP4Z SHT 2 ________ AR OPO men ah PTE 28 P4 qe 5V pa 1 ul a 5872 R ne ar 12 FIO REF SHT 2 SEL 2 _ et le Pil 5 4 7K SHTZ HD SEL 22 E PIZ MATE c34 22 i 3 _ WRITE XTAL 1 22 4 SHT3 R95 4 7K gt PRI gt MA sM 5V 52 Bp 23 SIZE SEL 1 ___ 220 547 2 ZK ak l M T 224 50 RE 25 dano pF _ MOTOR FEEDBACK x A a 1 MAT WIAL SCALF R87 4 1K s pe WR F LLT SHT 2 cmo we E 5200 Hf OTHERWISE SPECIFIED APPROVED DATE omer 268 6219 2
7. 2728 4 2PL 30 X Q N 9 2PL gt DIMENSIONS ARE IN INCHE ik Rolo AS TOLERANCES ON 2029 OTocie Avenue San 95131 used or indirectly in any way ot CORVUS detremental to the SYSTEMS OMB BACKPLANE ASERT DIP SWITCH AS A SECONDARY L FROM Y OPERATION AFTER WAVE SOLDERING ASSEMBLY FOAM DRAWN BY U 63 This drowing and aperificotiona herein are the prop arty of POWER ONE and shell net be repradueed copied or used in whale or in part es the besis fer APPROVED the manufacture or sole of without written FOR Rs 2 24 34 CRI2 Ho e CRI 12N VADI t 3 12 E CRE FOR PARTS LIST SEF P L 52659 15 soome O O TOLERANCE XX 039 CONTRACT NO _ CAMARILLO CALIF 93010 FOR PARTS LIST DASH NUMBER SEE APPROPRIATE MODEL MDL ens EHEL A 4 SEE PART LIST FOR COMPONENT VALUES te ALL REGIGTORS ARE 174 W UNLESS OTHERWISE SFECIFIED MATERIA A EA 2 ALL CAPACITOR VALUES ARE IN MICROFARADS VOLTS ps ENG APPD LAMA 42 UE fie SE ee NOTES UNLESS O
8. ed 32 7 3 6 1 MUX ods tee AA OO d lau ahaa eats wea i RS CU RET ee 32 7 3 6 2 DRIVE ANA OAS a Rx een 33 73 7 SEE aser AGGERE e ORC RUE AC NH ER 33 73 8 PARK Waxing d denas ZA PR Ree eae eode EU edt ees TER ES Per a d i 33 73 9 DUET Ls sek eh docu eeu ai EE D CU ET d bad 33 ii CORVUS DEALER SERVICE 7 4 Controller Diagnostiese Er 34 7 4 1 General Description ae MS E d de be EE 34 74 2 Controller Diagnostic Commands 22424 Tad waned Gl Uie EU ein 34 74 2 1 A Abort Diagnoste v ees set RR E beoe GU da 34 74 2 2 B Macro Men OE eI a dec AOL dace ane dpa do dup i TOUR OLD 35 74 2 3 C Change Slot Number ar as A 35 74 2 4 D Download Diagnostic sans os RRA eens 35 74 2 5 Analvze Servo iw sen Re ERAI Sa APE 36 7 4 2 6 Sinele Do SX ARR ER 36 7 4 2 7 L Full Cylinder Loopseeb ss ee eier 36 7 4 2 8 P Print Quiet Summary Report a a 36 7 4 2 9 Q Sector Quiet Pr f m eek 36 7 4 2 10 SG Reat scan 8 seen ede ee a Dee 37 7 4 2 11 T Single Cylinder Seek Scan sa er 37 74 2 12 X Write Scan Disk a E er OG 37 7 4 2 13 Y Rezero Heads oso a A A ee Va SEZ 37 74 3 Error Codes 38 75 rogram
9. u3 4 NOT USED WRITE DATA TM4030 F 5 5 MC RCLK Em 5V zZ 2 7 i u 2 R4 5 6uH 5608 WRITE DATA I 44 13 WRITE B WRITE DATA I 5 1 J44 14 DRIVE SELECTED SH 3 WRITE DATA 2 J45 i3 WRITE DATA 2 J45 i4 READ DATA SH i DECODE DATA SH 6 ENABLE 5 6 READ TIME SH DRIVE 2 SELECTED RESET CLK SH 3 54 4 tREADGATE B 4 MHZ CLK START SH 3 SH 6 SECTOR J46 20 SANT 5000H mici 268 02323 100 m SHEET 5 6 MEW ACCUPRESS 2 1 72 444 17 J44 18 SH 3 5 SH 3 445 17 45 18 READ DATA DRIVE READ DATA DRIVE DRIVE I SELECTED START I DRIVE 2 SELECTED READ DATA DRIVE 2 READ DATA DRIVE 2 6 5 4 3 2 1 _ _ ____ ER BEREK ESA 5V 3 RI D cw 5k 1 5V RS RZO 245 SIK C8 Sik 15 1 2 5v 10 4 TET 265021 265021 9 use 12 E DECODE DATA s A 7 5 ERROR VOLTAGE 17 RIS C6 rd A 4 R W 38 88 U 71 5 23 a 22 MHz PS VCO ENABLE 2 14 u24 OSC 7 VCO CLK 1 L 11 MHz Si A MATERIAL W INTERNATIONAL SANS 73 444 C16 Q M U24 U35 ASM 811 02323 REV o em 044 054 1 KT
10. 5 CONNECT B4 86 Be d Ci6 C90 c92 2728641 42 Bi 9oX 92 X 94 107 OIT re Cia 119 ze CRC ERROR READ GATE gt ur sms READDATA m WRITE DATA Sy 3 055 ze rz WRITE GATE 46 6 06 J46 3 5 7 16 21 22 25 2729 PA AAA TPO 946 ALL 0DD 33 21 JUMPER 4 57 3 146 16 TPA VERSION 5 m DAL 1 263 02323 100 RITE 5 5 WS 770 2 29 7 as ee 762 RA 1W3 2703 N Am 2703 3 UNLESS OTHERWISE SPECIFIED 444 45 2 4 6 8 11 12 15 16 1920 ZER 101 3 ToZ WG BRC ORE J3 2 3 ALL DIMENSIONS NCHES J3 4 5V TOLERANCES DECIMAL KI DI LINE REOROER 1120 8 7 6 5 4 3 2 E ee et q 27 51459 5000 CONTROLLER i pa or e REV f 1 SHEET 68 8 7 6 5 4 3 2 1 IUE INEUTT A E FF e es BZ gt SZR 2 Gin TAN MED DUREE ROA RRA pm pu MEMORY ENABLE 5 SHI ae SECTOR SEL BOSCE sus BEGRDY 5 4 XRERSTB SH 4 SH DATA BUS Sy abcess Z NA C sur gt ENSE R Y AS INI E TEE aus irn gt gt a INTERRUPT 5H 1 4 RP7 4 7K 1
11. 65 REV SEE SHT no PL 52413 101 SHEET 2 OF 2 PARTS LIST sto part wo vewoon mo rer oes 11 11 52416 cnassis wiss ______ 52415 1 PRINTED wano BOARD 222 Secar rewseoxwek al T O Yo 5 11 ne 0245 tkanseton fet a2 y favs veansitoR aa bL 1517 1262 el Ts EE CO s nommen 30 5 ae IAS Es KWITY AAA 121 2 316 200664 GRE A 13 ref _ 52659 SCHEMATIC _ 11 111 NE AAA ET INIA TN SARRIA O gt 2 A r 20 IN A 19 09 no 52659 10 2 04 BBY T ane 52420 oo TRANS FORMER ia IGE nn 11 01 I 5 6 OTE Sd d GC o 20302 4 45 __ ____ Ra O uos com Jd d EE 20221 87 TRA NEUEN __ ME DS _____ 120367 22k FF ROT RESISTOR 5 _____ 2 WIZ i i gt 2 9 _ NO A17629 PL 5 2659 101 SHEET 3 oF 4 E PARTS LIST 20 50 20307 RESISTOR VW 5 CF 21 1 150 20373 RESISTOR 4w 5 22 2 30 0287 REGULATOR 4723 112 24 24 0249 TRANSISTOR
12. GEELY Roa 1 LS Corvus Disk System sgt tyke meres Raa RER 2 1 5 1 Power Supply ves see nn reason rock W 2 15 2 Data Backup Pd aan naar 2 16 Winchester Disk Drive Rie a Ro D dO 2 2 INSTALLATION 2 1 IEA N ne er WERE 3 2 2 datay DANO ae ee 3 2 3 Receiving a Drive er er ER Te pde Lac 3 231 Diagnostic Test use rear A 3 2 4 Environmental Considerations II ES A A RA AAA Bi 5 2 5 Daisy Chaining of Disk Drives sd rasant 5 CHAPTER 3 OPERATION 3 1 scope OF Chapter A A Reese 7 3 2 Introduction PI CHE 7 3 3 ee ee wer re WA 7 3 3 1 Front Bezel EDS a RE 7 3 3 2 Front Bezel Switches ae AS A E edu RADE 7 3 4 Sequence u a Ra oa Pe Mae DMS eS aoe eh 8 3 5 Environmental Requirements x cession e rr Dr deep 8 3 5 1 Statie Electricity RAS ET re 8 3 5 2 Eine ee 9 3 5 3 arten 9 3 6 Periodic Maintenance RARAS AAA AAA 9 3 6 1 Regular necks AA A RR 9 CHAPTER 4 DRIVE DESCRIPTION 4 1 Scopeiot Chapter aan a a 10 4 2 Introduction s eere iced OLE a 10 4 3 Drive IES AS AS AS LAA 10 4 3 1 Power Supply A
13. 207 AN E 2 7 6 5 3 85 8 7 6 5 4 3 2 1 1 1 2 1 wma 214 275 ERZE DA DEE ZIK 2 7K AR E A O O EA De W 3N 4 RIS LOR HP TEN EE dic SEL 2 1406 a 154 uz u5 R12 9 t one CHIP EN J31 2 D Lsi4 140 gt HD SEL 2 EPEE SEL 2 c LZK ey HD SEL 2 3 N SEL 29 GHT R1 1 8K HEAD SEL ce LSI4 Y j31 12 20 lon RIO RY gt 15K 75 WRITE UNSAFE 12 e 3 SHT f Y SPARE 334 2 SPARE SECTOR 534 5 gt INDEX CLK 45 INDEX INDEX ze ZU J3u 6 uz p IDEAS 211236 1438 SHT ZERO SENSE 4 2 5 M TRACK 1438 jay LE sm WRITE FAULT 9 B SHT o uz y 8 WRITE FALLI 1438 SIZE SELECT Jg 9 OPTIONAL RESET SHT SIZE SELECT 7 er SHT READY 4 2 2 HP5082 2835 9 READ JI 22 234 9 ROW 1438 SW 5V 31 26 0RV SELECTED 051 o Res Ji 30 DRV SELECTED 3 14 O 3 4 12 1 31 37 STORY SELECTED 4 E 94 ui 59 Pas 2 p T 5 e u iO 5 00 gt 7 2 1 1 sia HORIVE SELECT SIZE SELECT I To 7 T 5 SHT UL pO SEEK COMPLETE SHT 5 SEEK COMPLETE
14. 5 Y E J4B 19 140 106 148 24 SEL 40 109 J48 23 5 DRY ACK J40 110 SIE BR 48 26 J40 11 1 PO oes 9 8 NWA GN DOUPODOD 5 2 248 20 NC 240 105 8 TJ WSXFER SHA J46 12 Sn 1 SHI CRC ERROR 44 SECTOR SIZE 12 274 SECTOR SIZE ZY 14 11 084 SEEK COMFLETE 35 6 15V PIO RDY 54 STROBE 240 91 748 6 5V Pb RP7 14 7 J46 8 LOK REDKE WR CURRENT 146 2 45 14 RI D SEL 25 4 4 25 HEAQ SEL 2 A obo HEAD SEL 2 146 14 3 4 Ho 5 45 24 145 5 DIRECTION IN us ACTIVITY LED READY 44 6 22 Z IKE 4 21 81 AM INCORPORATED 22605 mn 9 CONTROLLER Were 263 02323 100 AA 5 OS 7 6 5 4 3 2 1 69 8 7 6 5 THIS DRAWING AND THE INFORMATION IT CONTAINS ARE THE PROPERTY AND ARE TO USED ONLY POR THE PURPOSE MANUFACTURING PARTS J44 10 240 43 345 10 440 23 IN4148 RXD R34 3900 R33 2100 J40 5 J41 3 WRITE PROTECT RIOO LOK 5 n w 2 TRACK BD J4e 1O wur 1 fee v 4 5V 222 E J Bo VOD WRITE DISABLE 2113 7 RPS 244 9 5 FORMAT ENABLE J40 12 FO AT 5V wA O R5Q 445 9 gt 22 PIOSCE SH Z 10 gan ADDRESS BUS SH A _DATA BU SYSTEM CONTROL BUS Popen
15. 508 9 41 6 id 1339 SEEK COMPLETE ur 13 12 pre 31 16 5V J53 2 1 LSI4 1406 600 5V de 7 US 8 22 7 z ms 12 RZEKA 4 7K MATERIAL 31 tcODD 3 117 7 1574 INTERNATIONAL 4 ma 32 2 4 6 8 11 12 a LIAL 1 A SEEK COMPLETE R W LOGIC TER 2 0 SHTI UNLESS OTHERWISE SPECIFIED sur RESET 263 02157 201 s mu 2 or 8 7 6 5 4 3 2 1 86 gem Tem __ 3 O2 51 201 AAA gt bos Ge 44 465 v 129 wara 22 Seale en Be GR MANIC RER BOSE aes eR 2 1 EE A eee L C36 5V 912 12 V 200 R23 42 2 5 0 C25 Ys 220 2 5 4 4 0000 R26 510Q R27 1 0K Ai RU 2 470 52 21 wa Lo 2402 R42 8 3N 10 3 654 23 D t Hass o2 a us C22 240pF 22 495 la22 14 Lg 6 BB C20 510 0 24K GF R25 R33 R34 RAIS R32 R29 gt R30 220 Sson 5022 50 33041 lt 3301 RDDATA 50 0 LOK ZEN 1 E ZEE Cle 29 A gt RDDATAS 2 6 220pF 220 pF R15 2700 sur 2 _ DRIVE SELECT R38 2 1K EE en 1 2K 28
16. 64 Power Supply Schematic ee N da ae 65 CP510 Power S pply Parts List Veto PARA eoe a a ear A rasa 10f 2 66 CP510 Power Supply Parts List anne nn ra 20f 2 67 Controller PCA P N 263 02323 xxx Schematic 10f 6 68 Controller PCA PIN 263 02323 xxx Schematic 20f 6 69 Controller PCA PIN 263 02323 xxx Schematic 3 of 6 70 Controller PCA PIN 263 02323 xxx Schematic 4 of 6 71 Controller PCA P N 263 02323 xxx Schematic 5of 6 72 Controller PCA P N 263 02323 xxx Schematic 6 of 6 73 Controller PCA P N 263 02323 xxx 2 74 Motor Control PCA P N 263 02410 10f 2 75 Motor Control PCA P N 263 02410 xxx 20f 2 76 Motor Control PCA P N 263 02410 xxx Assembly OZ 77 Motor Control PCA P N 263 01908 xxx 1 2 78 Motor Control PCA P N 263 01908 xxx 2 2 79 Motor Control PCA
17. BIT single binary digit Smallest representative unit of data several of which make up characters A Z 0 9 etc Bits may be either a one or a zero on or off set or reset This may be shown by either a signal being present or not or by signal changing states or being constant BLOCK arelative quantity of data bytes The Corvus disk defines one block to contain 512 bytes of data the smallest addressable unit within the drive The host operating system may define a block as 128 256 or 512 bytes in length Externally since the disk drive handles data in sectors no apparent conflict appears to the host system BRAKE OR SOLENOID BRAKE immediately after power down this mechanism engages so as to minimize contact time between heads and disk surface and brings the platters to a stop BYTE any multi bit digital value usually eight bits long The Corvus disk drives use eight bit bytes CABINET OR ENCLOSURE the cabinet which contains the IMI drive mechanism power supply and fan The front bezel attaches to the cabinet basepan Two screws at the rear of the cabinet secure the cabinet top to the basepan CONTROLLER OR Z 80 CONTROLLER OR INTELLIGENT CONTROLLER the disk controller circuitry including the Z 80 microprocessor and support logic CORCOM the rear bezel unit which accepts the power cord and contains the line filter line voltage PCB and fuse CYLINDER all data tracks in common vertical alignment There are 306 concentric c
18. Each head is suspended above the platter surface on an 18 microinch 4572 microns air bearing A particle of smoke dust or a human hair could easily play havoc with with these critical tolerances and cause catastrophic failure of the disk device The seal on the drive mechanism prevents this from occurring by keeping the internal atmosphere contaminant free Breaking this seal for any reason voids the warranty There are two heads for each platter in the drive mechanism The heads are held by flexure arms attached to a common head stack casting which moves on precision bearings and stainless steel rails Positioning of the heads over the appropriate cylinder is accomplished by a four phase stepper motor via a split stainless steel band Seeking to a specific cylinder is accomplished by stepping the motor through four phases for each cylinder Reversing the sequence of these motor phases will result in reverse head movement Each increment of the motor is equal to 0 9 degrees rotation Two Printed Circuit Assemblies are Mounted beneath the drive mechanism These are the Read Write PCA and the Motor Control PCA The Motor Control PCA is responsible for monitoring the spindle motor speed and altering it as necessary Index and track O signals are also buffered on this board The Read Write PCA contains a 6801 microprocessor IC which makes the drive mechanism itself an intelligent device freeing the 7 80 controller from many rudimentary tasks The Re
19. power stability temperature and humidity limits The first step in analyzing faults in the Corvus disk system is to isolate the drive from other devices This includes removing networks such as the Corvus Multiplexer and OMNINET local networks and backup devices such as the Corvus Mirror Using known good Interface PCA and flatcable connect the Corvus disk drive to a known good host computer Before any diagnosis of the Corvus disk drive can be carried out the symptom must be duplicated If the problem does not reoccur within a reasonable amount of time run the burn in diagnostic program overnight to thoroughly test the drive 45 Fault Isolation CORVUS DEALER SERVICE 8 5 3 Drive Not READY In order to troubleshoot faults in the Corvus disk drive it must first be in the READY condition indicated by the READY LED being lit First power on the drive and wait approximately 90 seconds The READY LED alone should light and if this does not occur steps must be taken to correct it 8 5 3 1 Interface The host computer Interface PCA or cable could be defective not allowing the drive to reach the READY condition Disconnecting the flatcable from the drive PROCESSOR connector will isolate the drive If the READY LED now lights replace the Interface PCA and cable one at a time to isolate the faulty module 8 5 3 2 Controller Firmware During the normal power on sequence Controller Firmware is read into the controller RAM If t
20. z 8 7 6 5 4 3 2 1 76 BER __ ys 12811 02410 833 hc 1 2 Tal mu TP2 R36 cum mem ezo 35 2 ud R23 MOTOR PONITUR Teno risp SN us RE 013 77 22 1 24 15 424 16 24 7 424 8 J24 14 J24 11 J24 12 SH 2 BISHOP GRAPHICS ACCUPRESS REORDER NC 474765 8 R37 2 3 l COIL J22 5 6 8 RS 24n 92 16 cu ULN IE COIL 2 20748 J22 2 4 B R6 141 iw 12V 5 RIS 82n BRAKE NAN gt J22 7 ne BRAKE RET J22 8 2564s i MOTOR i2V 22 4 T c4 MOTOR RET 22 2 EJ 1514 R34 asas MOTOR J22 3 270K 4 62V 5V RI9 v8 1 2K LS RIT MOTOR TAC 13 T 12 yos t 2 V4 us R38 6 2V 154 2 Ri8 lo 2 1 2K Fur 2 CR CRS CRO R22 INA4IAB 14148 IN4 48 Y IN4 48 4 7K FN QI CI e 209 2 2907 22 1 2 MEG 69 Ri 6 2V 47 6 7 47 5 1 2LM392 gt 6 2 4 L2K a2 R2 2 2222 47k 25645 DEC SPEED INC SPEED 5 16 un 8 x CD4020 RS a 3 M 2 4 MOTOR LS30 1 12 gt 1502 5 ADS C6 T 10 T 1 502 POWER LOSS 1 SH 2 I MHz CLK 424 4 E DRAWN E DATE M LIFF 9 10 82 DATE FINISH IRA MOTCR CONTROL DATE 5090H D 263 019
21. 5 H e 2 3 lo ALL RES ARE IN IA AS UV EW 9 25 w Ve 2 A OS wf 2 ALL CAPACITORS ARE MICROFARADS uf gt rm um pe Sa ots per MY GO wma UT vj masy gt ALL ENTE SERIES CS 3 4 25 Balt ke zam ar m4 A MPN 5V PIN Tx GNO Puce nai 4 315 x2 am Frac 248 s med I B Vp PWN PIN Gs SV PN 8 GND N 74504 tia Mein C 30PN ANi6G Sv PIO GND N 24722 were 2212 44 4 RAM CUSTOMER sas cco SEN wet vicc pua INSTALLED 1 i Bo ona TRA a ko ko go c MEE ER 2 EB 5 ser FOR mmm LIST 1 2 eue NM RA EEE P R lt p gt RAM BUS SH4 sus 22 To UO AY D ADORES BUS 5h 2 3 4 AN TZOA MER YA 5 4 ru z 4 EA 32 09 RAA EN 2 leg 5 ua gt A MREGO a NZ o 122 i z NE 008 Ra 2 3 WRIO RESET an Ne 2 5 23 z 1 8 MEMORY ENABLE et sud RAAT NABLE WR PSK MEN QE RD SYSTEM c EOL sya DERE sus 5 2a LNAIT GATE A 3 3 35v L eua sus ie Saw Dam GA gt gt
22. Computer Similarly the controller receives NRZ data from the Host Computer and converts it to format before passing it on to the Read Write PCA for writing to the disk media 4 9 2 1 Controller During Seek Commmand The Host Computer operating system sends a command to the drive controller in a one two or four byte format The controller using decoding routines contained in the Controller Firmware decodes the command The Z 80 microprocessor then calculates the difference between the current cylinder number always held resident in RAM and the requested cylinder The resultant difference is stored in a RAM memory location and later decremented once for each cylinder the heads are moved Read Write PCA is then commanded to strobe the stepper motor windings PHASE A D The controller decrements the cylinder count one for each full motor phase sequence A D and halts the stepper motor at the appropriate cylinder At each cylinder the controller applies a lock current to counteract the motors momentum If the present cylinder is not the destination cylinder this current is very low When the destination cylinder is reached full locking current is applied to the motor windings which keep the heads on cylinder The next sector to move past the heads is read to verify the success of the seek If the incorrect cylinder was reached the heads are re zeroed and the seek is attempted again If the seek fails during this re try the drive halts op
23. Control single power supply Z 80 Controller PCA and cooling fan mounted in a grey plastic cabinet The Mirror PCA when installed and Z 80 intelligent Controller PCA are plugged into the two card slots of the backplane located inside the top cover 1 51 All H Series drives operate from either 110 120VAC 220 240 50Hz or 60Hz single phase power and use single power supply These power supplies are interchangable between all H Series drives 1 5 2 Data Backup Data backup is accomplished via the Corvus Mirror The Mirror converts the data from digital format to video format which is then stored on video cassette tape using one of many commercial VCRs The Corvus Mirror option comes internal to the drive when it is ordered or added as an external device later All Mirrors are available with a software controlled remote control interface to a Panasonic VCR model NV 8200 Mirror troubleshooting and repair is covered in the Corvus Mirror Service Manual 1 6 Winchester disk drive The Corvus disk drive uses the IMI Winchester disk mechansim This new generation of disk drive utilizes a sealed environment and low load low mass aerodynamically suspended read write heads which rest directly on the disk surface after power down Itis the contaminant free environment that allows for reduction in clearance between head and recording media This results in the heads riding on an 18 micro inch air bea
24. Formatted 6 27MB 12 53MB 18 80MB Bit Density maximum BPI 9 706 9 706 9 706 Average Latency ms 8 3 8 35 8 3 Average Access Time ms 49 49 49 Maximum Access Time ms 99 99 99 Maximum Access Time single track 3 3 3 Data Transfer Rate Kb s 625 625 625 Recording Format MFM MEM Rotational Speed 3 600 3 600 3 600 Start Time s 20 20 20 Stop Time s 15 15 15 Physical Dimensions Height in cm 5 75 14 6 Length in cm 15 0 38 1 Width in cm 12 0 30 5 Weight Ibs kgs Environmental Requirements Operating Temperature F C Non Operating Temperature F C Operating Relative Humidity Non Operating Relative Humidity Operating altitude ft Non Operating altitude ft 39 to 1229 4 to 50 40 to 140 40 to 60 8 to 80 8 to 80 1 000 to 10 000 1 000 to 50 000 0 1 5 cps linear increase to 100 cps 1 0 2 cps linear increase to 100 cps 5 0 for 5ms duration Operating Vibration g Non Operating Vibration g Non Operating Shock g CORVUS DEALER SERVICE Power Requirements Line Voltage Domestic VAC 100 120 48Hz 62Hz Single Phase Line Voltage Foreign VAC 220 240 48Hz 62Hz Single Phase Power Consumption Watts 125 Line Fuse Amperes for 100V 120V 2 0 slow blow for 220V 240V 1 0 slow blow Reliability Mean Time Between Failures MTBF 10 000 operational hrs within above requirements Maximum Repair Time Not more than 0 5 hrs viii CORVUS DEALER
25. If any of the voltages are out of tolerance follow the adjustment procedure for this supply 6 3 2 Voltage Adjustment 510 1 Remove cover to the enclosure as outlined in chapter 5 2 Connect ac power to the disk drive and turn on the ac power switch 3 Monitoring the dc voltages as outlined above adjust the 5V and 12V using the following adjustments CP510 R 9 12V R 16 5V 25 Adjustments CORVUS DEALER SERVICE ___________________________________________ _ ___ E EE _____ _ _____ _ _ A SIE ES ES Figure 13 510 Power Supply NOTE During adjustment the 5V or 12V may drop to or near zero This is due to the over voltage protection circuitry being activated To reset this condition turn off the ac power switch and bleedthe 5V or 12V charge to ground using a 10 K resistor Set the trim resistor to its original position turn on ac power and proceed with the adjustment 4 Remove ac power from the drive 5 the drive cover and screws CAUTION Do not manually spin the drive motor at any time 4 Motor Brake Adjustment Remove the drive mechanism from the cabinet and remove Read Write PCA as described in Chapter 5 Loosen the two brake mechanism assembly mounting screws Hold the brake solenoid assembly against the lateral location bosses 22 P gt Place the appropriate thickness gauge between the brake friction shoe and the motor h
26. LED lights and remains lit B FAULT and BUSY LEDs stay on READY goes off All LEDs stay off CORVUS DEALER SERVICE CAUSES ac power surge during read write operation Power supply voltages out of tolerance Controller PCA defective Weak media spot on platter surface Defective drive sealed mechanism 12V out of tolerance dc cable to drive defective Loose dc connection at drive 12 V non existent or not adjustable Drive motor defective ac input voltage set incorrectly See 12 above Firmware corrupted Format corrupted Low motor speed Controller unit address set wrong Controller PCA defective Drive sealed mechansim defective Controller ROM defective Controller RAM defective Controller PCA defective Incorrect ac power setting Power supply voltages incorrect Defective Controller ROM Defective Controller PCA 54 RECOMMENDED REPAIR Determine quality of ac power supplied to Corvus and host Determine types of devices on same ac circuit Large power consuming devices should not share power with the disk drive Check and adjust voltages Replace Controller PCA Determine tracks affected and spare Replace drive mechanism Check and adjust voltage Check wiring replace supply if bad Clean connector pins make sure connector is seated properly Replace power supply Replace drive sealed mechanism Check and adjust Update firmware Reformat drive and update firm
27. Motor Control PCA These are also compatible between all three drive capacities The power supply is a single unit supplying 12V and 5V It is completely compatible with all H Series drives The H Series Backplane PCA is attached to the drive cover via standoffs The Backplane PCA has two card slots which accept the Controller PCA nearest the cover and the Mirror PCA when installed The H Series backplane is common to all three H Series models but cannot be interchanged between other 5 25 inch drives The Controller PCA is located in the uppermost slot nearest the cover of the drive Backplane PCA This PCA is common to all three H Series models but cannot be interchanged between other 5 25 inch drives The Mirror PCA used with 5 25 inch drives 18 interchangable between all Revisions of the H Series drives as well as all other 5 25 inch drives The front bezel Paddleboard PCA is the same PCA used in all revisions of the 5 25 inch drive and most versions of the 8 inch drives and is interchangable between these drives 4 3 1 Power Supply Every Corvus H Series drive comes with a power supply to provide all voltages required by the drive mechanism and drive electronics The H Series drives require only 12V and 5V The 512 is the only power supply required by all H Series drive models 10 Drive Description CORVUS DEALER SERVICE 4 3 2 dc Power Cables All power supplies connect to a dc power cable which then connect to
28. PROCESSOR Connects to Video Recorder DRIVE Mirror Dip Switches Power Switch Connects to AC Cable Figure 3 Rear Bezel Check that all four front panel switches are in the correct position Run your finger along from right to left under the switches All switches should be to the left unless the disk drive is connected to a Corvus Multiplexer Network system or to a LSI 11 computer If so the appropriate switches should be set Locate the power switch on the rear of the drive and turn it on The drive motor will begin to spin and all LEDs front bezel Light Emitting Diodes will come on and the BUSY LED will flash regularly After approximately thirty seconds the FAULT LED will go out and the heads will rezero LED activity will briefly alternate between READY and BUSY after which the drive will set the READY signal and all LED activity will cease with the READY LED on The disk drive is now ready for communication with the host system 2 5 Daisy Chaining of Disk Drives A maximum of 80 megabytes of on line storage may be achieved by daisy chaining four Model 20 drives This is accomplished by using a common input output interface bus commonly referred to as daisy chaining A special Corvus add on drive flat cable is available specifically for this purpose One add on drive cable is required for each additional disk drive in the system All series and Versions of disk drives may be daisy chained together with the excep
29. Without firmware the drive will not recognize commands sent from the host system The Corvus drive responds to a small list of commands generated by the disk interface software which are patched into the host operating system when the drive is first initialized These normal commands are Read 128 256 or 512 byte sector Write 128 256 or 512 byte sector Enter Prep Mode download special firmware to RAM Mirror Backup Identify Verify Restore and Remote Semaphore Lock Unlock Retry and Error report Read Drive Parameters Spare Track and Mux table Pipes Initialize Open Read Write Close and Purge All normal drive operations are accomplished using the above commands as the Controller Firmware contains all 7 80 routines for decoding these commands Other commands are possible and are accomplished by first executing the Enter Prep Mode command which replaces Controller Firmware with special firmware containing routines for decoding these commands i e diagnostics 4 9 1 Power Up As soon as the power supply voltages have stabilized the 7 80 controller board executes ROM routine which initializes the Z 80 microprocessor and then tests the controller RAM and ROM If the self test fails the Z 80 halts execution leaving the FAULT and BUSY LEDs on and READY LED off 14 Drive Description CORVUS DEALER SERVICE HEAD SELECT 20 22 WRITE GATE MEM WRITE WRITE DATA LOGIC ee REDUCE WRIT
30. a L2K E R36 7K R35 4 1K INS234 12V a 227 59111 R 7 20 2 91 24 319 17 CRS e 1 656234 gt X FALSE GND 45 2 5 1 4 RU C30 47 pF WTK FALSE 5V B WR CURRENT 3 7 15 12 ZK KA WR SELECT y jaj_ j 1 WRITE DATA 32 14 00 AH J31 21 23 1002 CR3 Rul p WRITE DATA 32 13 2 5092 1 5K 1501 SHT WRITE 2335 22224 le dE J34 LOSS POWER LOSS A sut i Z WE DISABLE 2 1406 e SHT REDUCE WR CURRENT 2 A SANS UNLESS OTHERWIBE SPECIFIED ALL DIMENSIONS INCHES TOLERANCES 42 id SHT WRITE RIW LOGIC P y DT 263025620 3 33 8 7 6 5 4 3 2 1 83 10 20 R96 S N M C READ WRITE 811 02381 10 oe crs U2 J31 84 Dl 894 BEES R65 R50 R66 7 851756 imm R52 R92 017 R63 433 R9O R76 R77 R91 Q10 GND SHOP GRAPHICS ACCLPRESS ele Dre J32 12 RU EE Gao 432 5 VE Gi 32 8 BA RET POWER 055 5 220 SHT2 3 432 1 c RET ET 9 O 8 15222 J1 24 2444P 5 20 EN PRE 5 R17 2 2K ZE
31. disk drive which does not allow the external atmosphere inside the disk mechanism Inherent in this design is heads that rest on the platters after the drive is powered off The Corvus disk system uses International Memories Incorporated IMI Winchester disk drives READ WRITE PCA the printed circuit assembly responsible for changing the data received from the heads in MFM format and amplifying and shaping the data signal before passing it on to the Controller circuitry for manipulation CORVUS DEALER SERVICE APPENDIX B H SERIES PARTS LIST CORVUS DEALER SERVICE H SERIES PARTS LIST DESCRIPTION CABINET COVER CABINET BASE FRONT BEZEL IMI 5006H HDA IMI 5012H HDA IMI 5018H HDA MOUNTING BRACKET CONTROLLER PCA BACKPLANE PCA PADDLEBOARD PCA 5 25 MIRROR PCA CP510 POWER SUPPLY FAN COOLING FAN COWLING DRIVE CABLE 34 PIN DRIVE CABLE 20 PIN PDLBD BKPLN CABLE AC POWER SWITCH AC HARNESS AIC POWER CORD SCREW 8 32 X SCREW 6 32 X 5 16 SCREW 4 40 X SCREW 6 32 X 36 SCREW 8 32 X SCREW 6 32 X 1 SCREW 8 23 X SCREW 6 32 X SCREW 6 32 X SCREW 4 40 X 14 WASHER FLAT 6 KEPNUT 4 40 KEPNUT 6 32 WASHER FLAT NUT 6 32 58 PART NO 8010 08056 8010 09321 3100 02071 2200 02906 2200 02907 2200 02908 2400 02929 8010 09348 8010 08108 8010 03029 8010 08025 8010 09322 2600 01145 2600 01707 8010 09074 8010 08046 8010 08046 5100 02420 8010 08514 6010 01447 2800 02975 2800 02764 2800 02650 2800 0
32. drives All surfaces are used for data storage Since this drive uses a stepper motor for head positioning no servo tracks are required Contained in the head stack is the microchip This select microcircuitry is responsible for selecting which head is being used The microchip is also responsible for preamplification and transmitting of the signal to the drive electronics for further amplification 12 Drive Description CORVUS DEALER SERVICE TOP COVER STEPPER MOTOR SPINDLE MOTOR LINEAR ACTUATOR BEZEL AIR FILTER SHOCK MOUNT MOTOR CONTROL BOARD gt READ WRITE BOARD Figure 7 Drive Mechanism Components CORVUS DEALER SERVICE Drive Description Figure 8 Sector Interleaving 4 8 Transportation Considerations All Corvus H Series 5 25 inch disk drives have the capability of having the heads parked off of the data area of the platters Refer to the chapter on Diagnostics in this document for the head parking procedure Parking the heads in this manner does not preclude the drive from the need for gentle handling The disk drive is a delicate instrument If when the drive is transported it is subjected to rough handling the heads will impact the disk surface possibly causing damage 4 9 Theory of Operation communication between the drive and the host computer system is interfaced by the Controller Firmware resident in the controller RAM after the drive is powered on
33. if necessary refer to Chapter 6 Adjustments and Maintenance for details Next thoroughly test the drive using the Dealer Service Diagnostics as outlined in Chapter 7 Diagnostics of this manual Execute a CRC Format Check as well as verify the drive Parameters specifically the Spare Track table and the Virtual drive Offset table If either of these tables display values out of range use the PARAMETERS diagnostic utility to reset them to their appropriate values A new drive may be shipped with up to twenty four tracks spared There are a total of thirty one spare tracks available on a new drive which leaves a minimum of seven and most likely more for use in the field When the drive Parameters are first checked the values should be noted recorded on a label and attached to the drive for future reference In the event that the drive format is disturbed in shipment it may be necessary to reformat the drive The FORMAT utility should be used only as a last resort Using the PARAMETERS diagnostic utility first try to restore the drive parameters before attempting the FORMAT utility The format program will restore default parameters to the drive and therefore necessitate re initialization of these parameters with the original values i e previously spared tracks Default parameters are Spare Track table no tracks spared VDO table Model 6 drive 1 0 Model 11 drive 1 0 Model 20 drive 1 0 drive 2 911 must be add
34. is for use with the Corvus Multiplexer Network At power on time the controller polls this switch to determine if a Multiplexer is attached and loads the the Multiplexer polling routine from the Controller Firmware area into controller RAM DEC RLO1 and RLO2 are registered trademarks of Digital Equipment Corporation Corvus Multiplexer Network is a registered trademark of Corvus Systems Inc 7 Operation CORVUS DEALER SERVICE LSI 11 MUX FORMAT RESET Normal Single Normal Normal LSI 11 Multiplexer Format Reset Figure 5 Front Bezel Configuration Switches The FORMAT switch is a two position switch left position is OFF normal right position is ON This switch serves two functions First when the drive is turned on the controller checks all front bezel switches If the FORMAT switch is ON right at this time the drive will come READY if the ROM based self test completes successfully If however this switch is OFF the controller reads the Controller Firmware from cylinders 0 and 1 into the on board controller If this procedure is successful the controller sets the READY signal and the READY LED is lit and the BUSY and FAULT LEDs extinguished The drive is now ready to accept a command from the host system Secondly the FORMAT switch must be on for the diagnostic program F ORMAT to execute see chapter on DIAGNOSTICS In this mode the switch acts only as a hardware safety switch No one may ex
35. rezero timeout 198 230 rezero fault 199 231 drive not online 200 232 write fault 201 233 format protected 202 234 read fault 203 235 data CRC error 204 236 sector locate error 205 237 write protected 206 238 illegal sector address 207 239 illegal command op code 208 240 spare track table overflow 209 241 overlay failure 254 verify error burn in test 255 controller timeout diagnostic utilities 42 CORVUS DEALER SERVICE Fault Isolation Table 8 2 Hexidecimal Disk Error Codes lt 7FH gt g0H a Non Fatal Fatal 20 soft error 80 AO Co EO error in preparing 81 A1 C1 E1 seek timeout 82 2 cz E2 seek fault 83 C3 E3 seek error 84 4 4 4 header error 85 A5 C5 25 rezero timeout 86 A6 C6 E6 rezero fault 87 A7 C7 E7 drive not online 88 A8 C8 E8 write fault 89 A9 C9 E9 format protected 8A AA CA EA read fault 8B AB CB EB data CRC error 8C AC CC EC sector locate error 8D AD CD ED write protected 8E AE CE EE illegal sector address 8F AF CF EF illegal command op code 90 FO spare track table overflow 91 B1 D1 F1 overlay failure FE verify error burn in test EF controller timeout diagnostic utilities Fault Isolation CORVUS DEALER SERVICE on Fatal 224 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 Table 8 3 lt 129 gt 128 mm N Signed Decimal Disk Error C
36. 08 201 i RELEASED DATE dx ANR CH E SHEET OF 2 4 3 2 08 1514 P is 53 LSI63 2 15163 1 7 14 13 12 14 13112 1 sH Mile CLK 2 SECTOR 4 2 e 1502 INDEX SH I 9 INDEX CLK 3605 J24 5 C 2 INDEX 324 6 1 2 LSI75 9 SND 12V R32 5 220 22 4 OPEL 45V ER TP 3 AMP RET Res GND J23 3 202 R27 4 7K gt Jas cs DIODE RE lt 29 2 T I0uF SPARE 627 2 T Pea gt 6 1514 SPARES 6 2V 5 1 R29 24K SH I d POWER LOSS jog CZ ZE TP 2 CYL PG J23 1 424 3 NOTES UNLESS OTHERWISE SPECIFIED 1 ALL RESISTORS ARE IN OHMS 1 4W 5 2 ALL CAPACITORS ARE MICROFARADS 3 USED C9 8 6 225 gt MATERIA SERE NONE INTERNATIONAL M LIFF_9 13 82 MAT M s m MOTOR CONTROL A 500 D poni pn 263 0908 201 SHEET 2 OF 2 eg 7 6 5 4 3 79 5 R23 S N GND R18 CR4 R15 Y u2 E o c 212 u3 _ u d 8 uo EE p LE u4 819 J24 CE U5 MOTOR rn an REKI Cun 80 u12 811 01908 TP2 R36 HF R35 J25 8 7 6 5 4 3 2 1 a AO TYE PROPERTY OF Um AND ARE TO a DQ mm 263 02381 20 Y FOR THE PURPOSE MANU RZE PONE PARTS POR ME erem we MES AA SS SINE A EOL E ee STEPIRES
37. 1177 2800 02776 2800 02774 2800 02765 2800 02666 2800 02664 2800 02652 2800 01198 2800 01189 2800 01188 2800 01171 2800 01165 CORVUS DEALER SERVICE APPENDIX C INTERNAL CABLING CHART CORVUS DEALER SERVICE H Series Drive Internal Cabling Chart The following references of left and right are as seen from the front of the drive cabinet All H Series Drives Flatcables Mechanism to Controller 34 pin Mechanism One edge forward Controller one edge to the left Mechanism to Controller 20 pin Mechanism one edge forward Controller PCA top connector only one edge to the left Paddleboard to Backplane 20 pin Paddleboard one edge down Backplane one edge to the left Backplane to Host Interface 34 pin Backplane one edge to the left Host Interface refer to the Installation Guide Dc Power Cables To Drive Mechanism Yellow wire forward Backplane Yellow wire right The following references of left and right are to a drive mechanism that is held upside down with the IMI serial number label to the left Drive mechanism Motor Control PCA Brake connector located at left end Drive motor connector located at right end Track zero switch flatcable connector 90 degree rotation before connecting to molex pins NOTE On Motor Control PCA assembly number 811 01908 the drive motor connector 22 will have an open pin after all connectors are a
38. 3 1 Diagnostic Test Upon reciept of a disk drive several procedures must be exercised to verify the proper functioning of the equipment 1 Verify front bezel switch positions 2 Verify Mirror Switch positions on rear bezel 3 Check Controller Firmware VERSION 4 Check power supply Voltages 5 Execute CRC Test 6 Check Parameters drive and MUX and record on paper 7 Execute EXERCISE Utility Installation CORVUS DEALER SERVICE 8 Run BURN IN Diagnostic destructive to data 9 Update Controller Firmware drive Diagnostic option UPD changing tables when prompted answer yes Any Corvus disk drive may be ordered with a Corvus Mirror PCA installed In all 5 25 inch drives the Mirror PCA plugs into the Backplane PCA alongside the Controller PCA inside the cabinet cover The drive has four DIP switches located on the rear of the cabinet which MUST be set to correctly reflect the internal Mirror configuration whether installed or not If these switches are not set properly the drive may not function properly refer to the chart below for proper switch configuration Drives using a Mirror externally should use the No Mirror Installed switch combination DRIVES WITH NO DRIVES WITH DRIVES WITH MIRROR OR EXTERNAL MIRROR PAL SECAM MIRROR NTSC MIRROR The shaded area indicates that the switch should be pushed in on that side Figure 2 Mirror Configuration Switches Check the drive power supply voltages and adjust
39. 7 340 6 UNTSELECT A 1 0 J40 8 UNIT SELECT 2 em 340 0 gt S YSTEM sn SEEN Su 4 MEME DISK 220 SH 4 Disc MEM rel A SH 47XFEREND su 4 RESET SH 5 5 5 MHz R CLK igi 91150 9 8 LSO4 504 R32 Sy MEAT R31 100 2 3 2 1 pe ten CIC 25 SSJ FR AH Meer qu eau 2 SELECTED 255 SH 5 6 gt ORV 2 SEL 346 28 uos 7406 2 8 ORV SEL 1406 DRY SELECTED NEA 100 7 340 3 J41 2 gt DS 3 RIOZ SOM J40 1 2 2N2222A szy TP J4l I WRITE 1200 WRITE GATE A SH 1 TPS 149 READ GATE 3 8 READ GATE use 1504 05 2 RIOZ 5V 5 READ 12025 R35 LOK 15 U52 825129 153 825123 u43 51714 14 2 PST SEN HERR 1 21 MEET ps m PIERO 2 21111 5 WR DSK MEN y 12 CEN 149 3 12 o en HEADER DATA E E i SH 1 2 4 EOB B DSK WAIT T TEOG s 4 MHz CLK PE CLOCK sui A 11 20 02 29 02 4 INCORPORATED UNLESS DIMENGIONG INCHES TOLERANCES were oo CONTROLLER 265 02523 100 JaA 5 or 6 1 70 8 7 6 5 4 3 2 1 THIG DRAWING AND THE INFORMATION IT CONTAINS en wv jer 263 02323 100 GF MANUFACTURING ZAR
40. AA A 10 4 3 2 dec Power Cables A AA 11 4 4 General ti dad 11 4 5 OW RE EE Ra su en E es 12 4 6 Controller Firmware AA Er a 12 4 7 Data DUOPAPB U I sse eu eir ee ar ehe 12 CORVUS DEALER SERVICE p M Q _____ ___ ____ ______ ____________ ______ _ __________________________ _ _ 4 8 4 9 Transportation Considerations 1 3 601402 Br ticas 14 Theory of Operation dpe cees SARA ERR 14 4 91 Power UD osse ed nov ur ag eee Ve doe 14 4 9 2 Controller PER oru A et TORE 16 4 9 2 1 Controller During Serias ous e rer A QA Ha 16 4 9 2 2 Controller During Read and Write DOTT 16 4 9 3 Backplane PCA Geb roD ERE ARN EE Di E aan e a MU shied 18 4 9 4 Paddleboard PC A ns 18 4 9 5 Interface PCA 18 4 9 6 ReadiWrite PC A a E ce psa ad si qt i ea exutus Rd swa qu UE 19 4 9 7 Motor Control PC A ei wes 19 CHAPTER 5 DISASSEMBLY 5 1 5 2 5 3 GF Ch pfer 20 Introduction er ME eS Ln Ta AGA A 20 5 2 1 Tools Required ii A ce 20 Plastic Package a
41. C and finish with END OF MACRO PROGRAM A sample Macro program with the name of TEST is on the Dealer Service Utilities diskette 74 2 3 C CHANGE SLOT NUMBER This command allows the operator to change the slot number of the drive under test The default value is set to slot 2at the start of execution Note It is possible to have multiple drives under test by starting execution then changing slot numbers You will have to return to the original slot to view test results The format for this command is C return The computer will prompt you for the slot number as follows ENTER SLOT NUMBER DEFAULT 2 Enter the slot number desired and press lt return gt 74 2 4 D DOWNLOAD DIAGNOSTIC This command must be executed before any of the tests can be performed on the drive This command loads the Z 80 code into the memory of the drive controller The FORMAT switch must be on before downloading the diagnostic in order for the program to function correctly The format for this command is D return 35 CORVUS DEALER SERVICE Diagnostics 7 4 2 5 I ANALYZE SERVO This command allows the operator to measure the seek time of the servo without an oscilloscope Since the 5 25 inch drives use a stepper motor servo mechanism which does not require any adjustment this utility is for use with 8 inch Corvus drives only The format of this command is as follows I lt return gt The controller will perform 256 seeks a
42. DEALER SERVICE CHAPTER 4 DRIVE DESCRIPTION CORVUS DEALER SERVICE Drive Description CHAPTER 4 DRIVE DESCRIPTION 4 1 Scope of Chapter This chapter provides a description of the Corvus 5 25 inch Model 6 Model 11 and Model 20 disk drives and their component interactions Some terms are defined to help provide a foundation for the following descriptions 4 2 Introduction The Corvus H Series drives are functionally identical except for the drive capacity They are Model 6 5 6MB Model 11 12 8MB Model 20 18 3MB Each drive is divided into three modules power supply disk sealed mechanism and controller electronics The individual components of these modules are Disk sealed mechanism Read Write PCA Motor Control PCA power supply or Supplies Backplane PCA Controller PCA Paddleboard PCA Drive Cabinet All drive components of the H Series drives are identical and are completely interchangible These are the minimum accessable modules and are offered as replacement parts as listed above No sub assemblies are available as spares 4 3 Drive Layout The H Series drive retains the high impact plastic cabinet of the 6 megabyte Rev through Rev drives but uses many new internal components The new drive sealed mechanism can be identified by its aluminum casting as opposed to the B Series 6MB molded plastic drive mechanism Mouted beneath the drive mechanism is a Read Write PCA and a
43. Diagnostic Utility is a helpful tool for exercising a particular track suspected of having media problems This program is destructive to data and should be used only if a backup of the data exists Selecting this option from the Dealer Service Diskette will result in the Slot Number and Drive Number prompts Enter the appropriate values Pressing lt escape gt will exit the program The prompt SERVO ACTION Y N is displayed If The servo mechanism is not suspect enter N For each pass or pattern the test displays the pattern number the track being tested and the beginning sector for that track The Track Diagnostic begins with the a read from the first sector on the specified track This is followed by a write of a specific pattern to that sector and then a verification of the write If this is all successful a dotis printed on the screen If an error is detected an asterisk is printed The test is then repeated on the next sector Pressing the lt return gt key or SPACE BAR will halt the test and display the submenu C ONTINUE L IST ERRORS R ESTART 771 C ONTINUE Entering will cause the program to continue on as it was before interruption 772 DIST Entering a L will display an error summary for example ERROR SUMMARY PASS NUMBER 0 2160 TOTAL READS 1080 TOTAL WRITES 0 TOTAL HARD ERRORS 0 TRACKS WITH HARD ERRORS 0 TOTAL SOFT ERRORS 0 TRACKS WITH SOFT ERRORS The pas
44. E SEEK COMPLETE SHT 2 R82 1 2 1W RBI l L IW Ra gt 132 6 Sy J32 12 rn gt 22200 Surg POWER Loss 4 gt 5 32 bow ges sacs us RET 3232 1 2 RET 182 9 28 RET pasza pe ES RAPER la Ca BS R pao AG 20 EN 277 2 2K SIZE SEL 1 5214 SIZE SEL 4 431 22 323 lt 20 S 2 K6G E 6K ui u7 T 8 REDUCE RESISTANCE gt SHT 3 5 2_ SEEK COMPLETE 1406 77400 ZERO SENSE rz RP ig Mr 11113 ee 5 SEEK COMPLETE 7 R ZD ZY A e Ro RS 2 SHT3 31 34 lt 228 25 Bde adi o o REDICE WK CURRENT urs A cb R Ru ae Dem DRIVE SELECT WRITE FAULT PAP OE ZE U6 3 __26 p43 2472 211508 WRITE G4TE 13 2 O SE 1514 732 7 SHT 2 ERASMI COM 27 P42 um t J32 8 B SHT 2 REWA ee ddd u rn Q10 5V 5V SHT 2 __ EA TI R84 SHT 2 S 47 surg SEL 2 X1 5 MHz c33 CRYSTAL S 22 WRITE n en ann SHT 3 _ WRITE ud LOG SIZE SEL g 5V VVVv 12K 16 i 421 UNa SIZE SEL 1 bees 221 2 7438 B E ie 15193 2 tl
45. E CURR MOTOR m mm 2 DC HUB MOTOR VELOCITY INDEX READY INFORM DET INDEX WRITE FAULT TRACK 000 CONTROL DETECT LOGIC DIRECTION IN STEP M DRIVE SEL 1 R W HEAD 2 000 CONNECTIONS gt SELECTED RT Figure 9 Drive Mechanism Block Diagram 15 CORVUS DEALER SERVICE Drive Description If the self test executes successfully the drive begins the controller boot routine This consists of first re zeroing the heads bringing them over the first cylinder of the disk surfaces The front bezel switches are then sampled If the FORMAT switch is ON right the controller sets the READY signal If it is OFF the Controller Firmware is read from the first cylinder into the on board RAM If the Firmware is successfully read in the drive comes READY If a bad block CRC error is encountered while reading the firmware the controller will attempt to read from the second copy any bad sectors found in the first It will continue to read alternate copies from the the first two cylinders until all Controller Firmware is successful y loaded into the controller RAM The controller will then set the READY signal and the READY LED will be on with the BUSY and FAULT LEDs off 4 9 2 Controller PCA The Z 80 drive controller is responsible for interpreting commands sent from the host computer system and controlling the sub assemblies the drive mechanism and ass
46. J22 2 L Ri B 45v MOTOR J22 3 5 PU L J24 9 A es ne rs RE U NONE j PAWN 1 AA za dee 8 10 82 7 _ _ _ _ _ ro I y A nn A MOTOR CONTROL 42 5 5000 H D 263 02410 001 pue RIRs or 2 UNLESS J MERWISE UN A DIMENSIONS INCHES TOLERANCES FRACTIONAL ANGULAR ABE ix SHEET 75 HIS DRAWING AND THE INFORMATION NO m um TAINS ARE THE PROPERTY M AND ARE TO AA ab R 480 RE fl ONLY FOR THE DEDE 2 MANU 2 2 224 0 00 WING BARTS N BB 2645 49 ee eui i MHz CLK SECTOR 4545s INDEX SH 1 i C INDEX J24 6 112 5175 vn 2 225 ON eg TP 3 MP GND de J23 3 A RET l 123 2 DIODE RET eee 1 5234 600 2 SPARE 124 013 424 0 B 25 25 R29 4127 I POWER LOSS j gt 4 22 TP Z CYL y23 1 L SENSE J29 3 NOTES UNLESS OTHERWISE SPECIFIED RESISTORS ARE IN OHMS 1 4W 5 2 ALL CAPACITORS ARE MICROFARADS yu NOT USED C9 Ki6 A A a O Aa a 22 gt a ee 9 52 42 Gen 9 d MOTOR CONTROL 5000 H UNLESS OTHERWISE SPECIFIEC H 1 APPROVES D 263 024 0 001 i FRACTIONAL RELEASED DATE SHEET OF 2 REV
47. OOT OR BOOT DISKETTE YES YES FORMAT REPLACE REPEAT DRIVE UPDATE DRIVE PROCEDURE ANARE MECHANISM YES CATALOG OR DIRECTORY 7 YES EXECUTE DRIVE DIAGS SELECT EXERCISE NO YES id ERROR IN FOLLOWING FLOWCHART D gt YES A A YES RUN CRC TEST SEVERAL TIMES RUN CRS TEST SEVERAL TIMES NO REINSTALL MIRROR AND TEST RUN CRC TEST ERBORS SEVERAL TIMES YES PS VOLTAGE CHECK AND NOTE TRACK 5 SPARE OUT FAULTY TRACKS RUN BURN IN PROGRAM OVERNIGHT 50 CORVUS DEALER SERVICE SYMPTOM 1 Drive platters won t turn A All LEDs off and stay off B All LEDs light then BUSY alone remains lit 2 Unable to format drive A READY remains lit B BUSY remains lit constantly 3 Unable to update Controller firmware LEDs go off remain off CAUSES ac power improperly selected 12V misadjusted 12V not present at drive mechanism 12V not existent or not adjustable Brake solenoid not releasing Drive motor defective Mirror switches set wrong Interface card defective Interface cable defective Controller ROM defective Controller PCA defective Backplane defective Controller unit address switches set incorrectly Controller ROM defective Controller PCA defective Drive mechanism defective Drive not ready Bad track in firmware area HDA Controller PCA defective Drive s
48. P N 263 01908 xxx Assembly 80 Read Write PCA P N 263 02381 xxx 10f 3 81 Read Write PCA P N 263 02381 xxx 2 of 3 82 Read Write PCA PIN 263 02381 xxx Schematic 3 of 3 83 Read Write PCA P N 263 02381 xxx Assembly 84 Read Write PCA PIN 263 02157 xxx Schematic 1 of 3 85 Read Write PCA PIN 263 02157xxx Schematic 2 of 3 86 Read Write PCA 263 02157xxx Schematic 3 of 3 87 Read Write PCA 263 02157 88 vi CORVUS DEALER SERVICE SPECIFICATIONS CORVUS DEALER SERVICE SPECIFICATIONS Operational Specifications MODEL 6 MODEL 11 MODEL 20 Disks per Drive 1 2 3 Disk Diameter in mm 5 25 133 5 25 133 5 25 133 Data Surfaces per Drive 2 4 6 Heads per Surface 1 1 1 Data Heads 2 4 6 Number of Data Cylinders Drive 306 306 306 including all spare tracks Sectors per Track 20 20 20 Track Density TPI 303 303 303 Bytes per Sector Formatted 512 512 512 Bytes per Track Formatted 10 240 10 240 10 240 Bytes per Drive
49. R36 41K R35 4 1K N5234 ALF 12V pre 331 11 gt 1 R47 202 eos 11 2V J31 9 17 CRS 88 18 INS234 iD 5 J31 8 1G PA B FALSE GND 354 331 3 4 2204 C15 RI Jn C30 2 47 pF IE OTPS Y FALSE GND Sv DY J31 5 13 WR CURRENT 121 415 RI9 12 ZU 1 WAR SELECT 5 1 9 2 as A AO 12 14 WRITE DATA 22224 2 o gt 531 18 RS R20 2 gt END S 131 21 23 2200 T R12 PEA WRITE DATA CR3 m J2 13 HP 5092 1 5K GG 20 5 2 0 818 WRITE 2335 2222A fo 1 oat mE 1 POWER LOSS ED TOA ou TOA POWER 098 ur sut NR DISABLE 9 8 p m sk 7406 r TATE SHT REDUCE WR CURRENT E 2 1406 an 2 3 UNLESS OTMERMEBE 200 RUE 7 6 5 4 3 2 1 87 MC READ WRITE 811 02157 i R63 R89 _ d 4 E GND a J34 SN 4 J3 RE 1 7 ya u7 cs ___ rag R15 Jt C41 93 cs R7 SEI DD 34 RP 1 SES Bu R10 CR2 TP2 CRA R46 er 88
50. SERVICE CHAPTER 1 GENERAL DESCRIPTION CORVUS DEALER SERVICE a 2 5 Et par ZA Figure 1 H Series Drive CORVUS DEALER SERVICE General Description CHAPTER 1 GENERAL DESCRIPTION 11 Scope of Chapter This chapter outlines the purpose of the Corvus Systems H Series Model 6 Model 11 and Model 20 disk drives Brief description and layout is include as is a definition of Winchester technology 1 2 Introduction This document contains instructions for maintenance andrepair ofthe Corvus Systems H Series 5 25 inch disk drive Repair procedures for A series 8 inch 11 megabyte Rev A drives and B series 8 inch 11 and 20 megabyte Rev B and all non H Series 5 25 inch 6 megabyte drives as are networks and other Corvus equipment Corvus tm Level I Dealer Service is on a modular replacement basis and this manual is written to address this policy The H Series drives are manufactured in three capacities 6 megabytes Model 6 12 megabytes Model 11 and 18 megabytes Model 20 These drives all use the same grey high impact foam injection plastic cabinet This is the same drive enclosure used by several of the B series 5 25 inch 6 megabyte drives Checking the serial number will identify the type of drive to be serviced Instructions for troubleshooting and repair for all H Series drives are detailed in this document Also included in this manual is documentation on the Dealer Servic
51. T DIAGNOSTIC This command allows the operator to leave the diagnostic and return to the command level of the operating system The format for this command is lt return gt 74 2 2 B MACRO MENU This command allows the operator to create a Macro program The computer will prompt you with W RITE MACRO X ECUTE MACRO Enter W to create a Macro program The format for this command is W return 34 Diagnostics CORVUS DEALER SERVICE The computer will return with the prompt ENTER COMMANDS FOLLOWED lt RETURN gt TO END ENTRY TYPE END X RETURN Enter single letter Controller Diagnostic commands from this Controller Diagnostic menu one at a time each followed by return The Macro list should begin with the DOWNLOAD command and terminate with END The computer will then prompt you with DATA OK Entering a n will return the Controller Diagnostic command prompt Entering a Y will result in the computer prompt ENTER MACRO FILENAME gt Enter the name you wish to call the Macro program you have just created maximum 11 characters The computer will respond with MACRO FILE WRITTEN TO DISK The Macro file can be executed by selecting X from the Macro Menu The computer will prompt you for the filename ENTER MACRO FILENAME gt Enter the filename of the Macro program you have previously created and press return The Macro program will begin execution EXECUTING MACRO gt xx MA
52. TE 2 od POR 1 oe EZ A er ES A JF A E SH2 PIO RDY RIO 5 542 HSKERR u73 M SHZ XFERS 10 fas READY 047 J4B 8 D 22221210 532 047 592 STROBE BED 8 A27 620 343 32 Q 2 HSXSTB men riled CIS 02 41pF Q A 2 53 6 gt On Ac ERBYTE E EXT WAY SAI SH HSXCLR WR EXT7MEM SH XFEREND ey C RAM BUS SH 3 48 0 SH2 INTERRUPT p DATA 2 140 95 4 DATA BIT 1 Pr 48 12 DATA BITS 525 2 J48 DATA BITA 40 99 lt 2 BEGRDY QATA MT 440 100 COMMAND 2115 COMMAND BUS lt E 222 gt 54 4 SH2 448 i6 DATA BITS 240210 gt 148 15 DATA 8 77 48 102 B SHI 4 B SHI 5 54H 1 3 2 SH ADDRESS BUS 543 7 47 BUS ZAANI 511 54 5 RESET CLK RESET 54 3 ki dd 5 RPS 4 7K 2 R26 48 4 y SRST J40 89 100 J40 7 SYSTEM CONTROL BUS SYSTEM CONTROL BUS gt 5 2 3 SHI 45V 44 5 445 5 PNE NN m VIS SOOOH VE 5 mE CONTROLLER tee 6 260 02825 KQ 44 eer 4 6 2 1 REOROER 1130 8 71 7 6 5 4 3 2 1 ERR TORT COR mv Tem o 263 02324 00 TAINS ARE THE PROPERTY OF ANO ARE TO PAA 496755 FACTUNNG PARTS FOR MAL MANU 1 1 1 TT cl NA qp 8 NOT USED VCO CLK MHz 8 Sri
53. THE CORVUS SERVICE MANUAL 2222 CORVUS SYSTEMS H Series Drives CORVUS SYSTEMS DISCLAIMER OF ALL WARRANTIES amp 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 mer chantability or fitness for any particular purpose Corvus Systems Inc software is sold or licensed as 15 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 consequential damages so the above limitation 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 soft ware 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 thi
54. THERWISE SPECIFIED IUE D uem 8 7 6 5 4 3 2 64 WORRY INE RVSIONS erty of POWER ONE INC and shali net be reproduced co bw APPROVED dad wyko Hors wro PILOT RUN RELEASE 12 8 ze missien 2 22 12 2PL ee NOR 5V OUT 5VCOM 120 OUT 12V COM O SIKARA Of N FIN AZ OD RIS VADJ 57 JON PAD x sH 2 yo x 5 1 8172 AD O RIE AT BT TLIM WIRING TABLE APL O O FOR PARTS LIST SEE P L 52415 1 0 NOMENCLATURE POWER ONE REQD ITEM IDENTIFYING NO OR DESCRIPTION STD PART NO PARTS LIST RE CAMARILLO CALIF 93010 806 484 2806 5 TOLERANCE XX 030 8 XXX 010 a PULS ERZE MATERIAL DRAWN IR 10 12 84 10 EA ZR WSA DAREM ENG APPO MA 0 2 TORADE TO IN Les Be CTS SERGE NIONE Oe DRAWING FOR PARTS LIST DASH SEE APPROPRIATE MDL 0000 54407 52413 x2 NOTES UNLESS OTHERWISE SPECIFIED z 2 mmma ASSLIVBLT FOWER SUPPLY APPLICATION DO NOT SCALE DRAWING ur FULL T GRAPHICS AOCUPRESS i REORDER NO A17467 4 3 1
55. ad Write PCA sends data to and receives data from the drive mechanism and the Controller PCA Many motor control signals are also generated on the Read Write PCA 4 6 Controller Firmware Corvus reserves the first two cylinders of the drive for special code This is referred to as Controller Firmware andis not accessable to the host operating system This Firmware contains programming and system information required by the 7 80 drive controller and is loaded into the disk drive RAM when the drive is powered on or when the RESET switch is toggled The spare track table Multiplexer parameters Semaphore and Pipe information are contained in the Controller Firmware Identical copies of Firmware reside in each of the two cylinders The rest of the disk area is available to the host system for data storage the configuration of which depends upon the type of host operating system Only Controller Firmware version CF18 3 or later may be used with H Series drives When daisy chaining one or more H Series disk drives it is necessary to update Controller Firmware on all drives in the system using the latest version of firmware data file CF18 3 or newer 4 7 Data Storage Data storage arrangement is by concentric tracks vertically aligned as cylinders Each track is sectioned into 20sectors each sector has a data capacity of one 512 byte block Logical sectors are numbered by using an interleaving specification sector skewing scheme of nine for all H Series
56. and using an eraser clean on all gold edge connector pins to help eliminate any oxidation that may have built up causing improper contact Also reseating socketed ICs on the drive Controller PCA will ensure good pin connections 46 CORVUS DEALER SERVICE Fault Isolation WARNING Always turn off ac power and disconnect power cord before replacing any components Replace the drive controller with a known good unit 1 Remove power to the drive 2 Disassemble the drive and remove the Controller PCA 3 Install a known good Controller PCA 4 Power on the drive the controller was faulty the READY LED will now light If the READY LED still fails to light the next step is to replace the drive sealed mechanism with a known good unit 8 5 3 5 Drive Sealed Mechanism The drive mechanism is a sealed unit with no internally servicable parts Any malfunctions with the drive mechanism necessitate replacing the drive module Drive mechanism failure may be due to any one of the following 1 Microchip failure 2 Drive motor failure 3 Servo stepper motor failure 8 5 4 Link Inoperative If the drive powers on spins up to speed passes the self test and the READY LED lights certain basic circuits and sub systems within the drive are working The test does not however verify the integrity of the disk Operating System DOS the disk media or much of the drive electronics and power supply If the DOS is damaged or not properly p
57. ands should then be executed to determine if the controller is communicating with the drive mechanism If the diagnostic DOWNLOAD command responds with Download Aborted this indicates that the Host Computer and the Controller PCA are not communicating 8 5 4 5 Servo Action Once communication with the Controller PCA has been established drive mechanism performance should be checked Executing the servo exercise command Controller Diagnostic LOOPSEEK command will verify the drive mechanism s ability to seek read and write Fatal errors encountered during this diagnostic command indicate a possible defective drive mechanism 8 5 4 6 Controller Firmware If the controller and drive mechanism respond positively at this point the Controller Firmware should be rewritten and the drive parameters checked drive Diagnostic utility PARAM if this has not been done already The Z 80 controller does not check each block in the Controller Firmware area to check that it is legitimate Controller Firmware code and will attempt to load it into the on board RAM when the drive is powered on If the READY LED lights after power on thisis on y an indication that no CRC errors have been encountered Rewriting firmware is non destructive to data 8 5 4 7 Boot Some computer systems use a boot ROM on the Interface PCA to boot a DOS image from the boot area of the drive A faulty memory location in this ROM may cause the drive to fail at boot time Replace o
58. area The PARK HEADS command accomplishes this by moving the heads onto a non critical area of the drive platters All drive indicator LEDs will be off after executing this diagnostic option This indicates that the heads are parked and the drive should now be powered off immediately To restore the drive from the park mode either toggle the RESET switch or power the drive on 73 9 QUIT Selecting this option exits the program and returns the user to the main Dealer Service menu 33 CORVUS DEALER SERVICE Diagnostics 7 4 Controller Diagnostic The purpose of the Controller Diagnostic program is to provide comprehensive testing for the Corvus disk drives Some of these utilities are designed for use when adjusting the servo mechanisms on the Corvus 8 inch 11 megabyte and 20 megabyte disk drives and will not be used with the H Series drives These few utilities are included here only because they are provided on all Dealer Service Diskettes 7 4 1 General Description The Controller Diagnostic program is a combination of Z 80 host system machine code and high level language programs which allow the technician to directly communicate to the intelligent controller of the disk drive The code breaks down into three parts as follows High level language terminal program The high level portion of the program makes the host computer a semi intelligent terminal which can communicate with the drive controller There are several features im
59. atched for communication to the Corvus disk drive initialization procedures Corvus User Guide the drive will not function properly Linking is the process of booting the host computer with the Corvus patched DOS The type of DOS depends on the type of computer system and should be a known good copy patched for the Corvus drive For those systems that do not store a DOS image on the Corvus drive and then boot directly from the Corvus CP M does not booting the standard floppy based DOS and executing the LINK program will establish the patch Corvus recommends that Corvus Dealer Service Centers keep on hand archival known good Corvus patched copies of the DOS for the specific computers serviced at that location This will insure that new DOS copy may be substituted for the users DOS for troubleshooting purposes 8 5 4 1 Check Link Action Boot the computer using aknown good boot image or link software When this has been done list the directory ofthe drive or volume If this fails or a drive error is returned steps must be taken to correct this 8 5 4 2 Power Supply The power supply voltages should be checked and adjusted if necessary before any further testing is done Without proper voltages the read amplifier on the Read Write PCA will be referencing incorrect thresholds for the data signal possibly mistaking good sector for error 8 5 4 3 CRC Test Execute the CRC test This will test the controller s ability to d
60. available thru the command documented in 7 4 2 8 The format for this command is S lt return gt The controller will continue to read scan the disk until anew command is issued 7 4 2 11 T SINGLE CYLINDER SEEK SCAN This command instructs the controller to single step across the disk This can be used to observe the servo tracks on the 8 inch drives as the heads move across the platters The format of the command is T lt return gt The controller will continue to seek scan until a new command is issued 7 4 2 12 X WRITE SCAN DISK CAUTION This command will DESTROY data on the disk This command instructs the controller to perform a bottom level format of the drive This will not write Controller Firmware it will simply format the entire disk The format for this command is X return The controller will respond with X YIN Enter Y to write scan the disk enter N to abort The controller will continue to write scan the disk until a new command is issued 74 2 13 Y REZERO HEADS This command instructs the controller to position the heads on cylinder zero The format for this command is Y return 37 CORVUS DEALER SERVICE Diagnostics 7 4 3 Error Codes The errors codes returned by the command documented in 7 4 2 8 are as follows 00 Hardware detected fault in read or write 01 heads move off track while not seeking 02 seek time out 03 Phase lock oscillator error PLO 04 se
61. block is read from sector the CRC value is read with it and tested Bit errors may occur due to a bad sector damaged in one oftwo ways 1 physically faulty media resulting in dropped bits and mismatched CRC bytes 2 magnetically miscellaneous bits written to the block resulting in mismatched CRC value 30 Diagnostics CORVUS DEALER SERVICE The Cyclic Redundancy Code test isa non destructive test which reads each block of data and checks it against its CRC value If for any reason the CRC value in that sector does not match the block of data the CRC checker generator signals the controller that an error has been detected and the processor halts operation Any errors will be reported at the endof the program CRC errors encountered during normal drive operation will halt disk drive operation with the error code displayed Run this test several times to determine whether the error is due to faulty media where specific sectors will repeatedly will show errors or random magnetic bit changes where sectors will snow one time errors Tracks containing sectors with repeated errors should be spared using Drive Diagnostic utility PRM 73 2 EXR The exercise test EXR seeks random sectors and reads the header information from that sector to verify the success of the seek Periods print to the video display for successful operations asterisks for hard errors errors that exist after ten retrys and question marks for soft e
62. ctor CRC error 05 cylinder address mismatch 06 read after write verify error 07 guard band detected in data region 08 read sector time out 09 write sector time out 10 bad track list overflow 11 sector locate error 7 5 Burn In Program This program is destructive to data on the disk Be sure a back up of the data exists before proceeding Selecting the Burn In program will automatically begin the polling of the host computer slots The program determines the type of drive in that slot and the burn in procedure begins on all drives attached to the host system The Burn In program is rigorous read write routine which steps through the drive one chunk 256 sector quantity at a time reading and writing specific patterns to each of the sectors The program divides the disk media into chunks by dividing the total number of sectors by 256 The Burn In program begins with the highest chunk number When the read write test is completed for the current chunk a random 256 sector read test is executed over the complete disk drive When this is complete the chunk number is decremented by one and the test repeats The program may be halted at any time by pressing the lt return gt key or the SPACE bar This displays a sub menu C ONT L IST R ESTART Q UIT 75 1 C ONT Entering will cause the program to continue from where it left off 75 2 L IST Entering a L will cause the error list to be disp
63. d Write PCA is responsible for buffering filtering the read data and supplying write current Also the sector and track 0 signals are generated here The Read Write PCA contains a 6801 microprocessor IC which handles much of the servo motor control write current control and most of the drive mechanism control schemes The Read Write PCA is available as a spare part and is interchangeable between all H Series drive mechanisms regardless of capacity 4 9 7 Motor Control PCA Spindle motor speed is monitored by the circuitry on the Motor Control PCA A tachometer feedback loop helps maintain spindle speed within 0 5 of 3600 RPM The magnetic index detector delivers pulses to the Motor Control PCA which generates the index signal The Motor Control PCA monitors this signal and adjusts motor speed as required The Motor Control PCA is available as a spare part and is interchangeable between all H Series drive mechanisms regardless of capacity Two Motor Control PCAs exist one pln 811 02410 for use with the two wire brake mechanism and one pln 811 01908 for use with the three wire brake mechanism Each of these PCAs must be matched with the appropriate brake mechanism and may not be substituted for one another 19 CORVUS DEALER SERVICE CHAPTER 5 DISASSEMBLY CORVUS DEALER SERVICE Disassembly 5 DISASSEMBLY 51 Scope of Chapter This chapter contains disassembly instructions for all H Series driv
64. e Diagnostic Utilities supplied to each Corvus Servicing dealer These utilities provide for burn in reliability testing adjustment and troubleshooting of all Corvus disk drives The initialization and diagnostic utilities for the H Series drives are unique to the H Series and contain software specific to these drive models Use the appropriate A B and H Series software only for the proper drives Installation and operation of the disk drive are not covered in detail in this manual Forinstructions in installation and operation see the Corvus Disk Systems Installation Guide and Corvus Disk Systems User Guide 1 3 of Equipment The Corvus disk drive is a high speed intelligent mass storage peripheral disk device designed to provide the host microcomputer with storage and retrival of digital information instantly at the request of the host system The Corvus disk system consists of the 5 25 inch disk mechansim a Z 80 intelligent controller and power supply and may ordered with a host interface 34 pin interface flatcable and Corvus Utility diskettes 1 4 Model Identification The three Corvus H Series disk drives are identical differing only in the internal layout of the drive sealed mechansim The Model 6 uses one platter the Model 11 uses two and the Model 20 uses three The drive type capacity and manufacture date may be determined from the serial number tag located at the rear of the drive cabinet The fol
65. e cards also have ROMs containing boot routines for booting the microcomputer from the Corvus disk some do not and these computers must boot from floppy diskette Connected to the 34 pin flatcable the Interface PCA contains two input ports and one output port and address decoder One input port is an eight bit tristate data buffer used for receiving data bytes during drive to host transfers The other input port is the status port used for determining the state of the disk drive The output port is an eight bit latch used in host to drive data transfers When the host system needs to access the disk it first checks the BUS DIRECTION signal and if the bus is in the host to drive direction and the READY signal is high the drive is ready to accept a new command The host then sends command bytes to the drive During a read or write command the bus will remain in one direction without turning around until all bytes have been transferred The drive will acknowledge the acceptance and execution of commands by setting the bus direction bit of the status port This is a signal that the return code is on the data bus which must be retrieved before the drive will accept new commands of the above handshaking is taken care of by the Corvus interface software and is totally transparent to the user 18 Drive Description CORVUS DEALER SERVICE 4 9 6 Read Write PCA The ReadiWrite PCA is located beneath the drive mechanism The Rea
66. e changed and the data will be inaccessable afterwards The Format program will also rewrite these default table va ues Next the program will display a Controller Firmware file name This will be in the form of ENTER CONTROLLER CODE FILE CFxx x The current level of Controller Firmware at this writing is CF18 4AP If another version is to be used it should be entered now The version of Controller Firmware used on the drive should be none other than that supplied with the Corvus initialization diskettes that were used when the drive was originally initialized 73 4 VSN This utility displays the current versions of the Controller Firmware and controller ROMs DRIVE 1 Vxx x CORVUS SYSTEMS DD MMM YY CONTROLLER ROM VERSION nn 31 CORVUS DEALER SERVICE Diagnostics u where DD MM Y Y represents the release date of that Controller Firmware version xx x represents the Controller Firmware version i e CF18 4AP nn represents the suffix of the controller ROM i e 763 At this printing the current versions are Controller Firmware CF18 4AP Controller ROM 763 73 5 WARNING This utility will destroy data on the drive Although the Format utility should be used only as a last resort when attempting to reestablish normal drive operations the drive may at some time need reformatting This diagnostic level or bottom level format writes the rudimentary magnetic pattern to the tracks required before data may b
67. e described and their functions detailed Environmental requirements are discussed and recommended regular checks for the drive are given Operation and initialization instructions are detailed in the Corvus Disk System User Guide for the appropriate host operating system 3 2 Introduction AllCorvus 5 25 inch H Series drives have front bezel indicator lights and function switches The switches must be set properly reflecting the system configuration in order for the drive to function properly Indicator LEDs on the front bezel display the state of the drive and help in diagnosing the condition of the drive at any time 3 3 Controls Operator controls are located on the front bezel of the enclosure Three LEDs monitor the current state of the drive controller Four function switches are located under the LEDs Rear bezel components consist of fuse and power selection unit CORCOM power switch video connectors Mirror configuration DIP switches connectors for host processor daisy chained drive and remote control VCR interface cables 3 3 1 Front Bezel LEDs The LEDs are labled READY BUSY and FAULT During the power up sequence all LEDs are on and BUSY blinks while the drive motor reaches operating speed After the drive has completed the power up sequence the READY signal will be set the READY LED will be on and the BUSY and FAULT LEDs will be off During normal operation the READY LED is active when the drive is ready to recei
68. e ea lana kongi 20 5 3 1 Top Covers eier NA a 20 5 3 2 Controller as urn 20 5 3 3 Backplane Cover nu ae CUP RA ES 21 5 3 4 Drive Mechanism 6 _ 21 5 3 5 Read Write PCA ce Nissan 21 5 3 6 Motor Control nad 21 5 3 7 Power Supply an ee cae twee ty ee Aa 24 5 3 8 Front Bezel Ut e 24 CHAPTER 6 ADJUSTMENTS AND MAINTENANCE 6 1 6 2 6 3 6 4 6 5 Scope OF Chanter ee aquas Nee wall Sd arae oap 25 Introduction 749 A 25 Power Supply Voltage Check and 25 6 3 1 Voltage CP510 RA AAA RE AS 25 6 3 2 Noltase AdIust 25 Motor Brake Adjustment oe ERE Ee CERE XR REC evi etae di 26 Index Sensor AdjusEmnentuss Ur ati UA TRAGE UE 28 CHAPTER 7 DEALER SERVICE DIAGNOSTICS 71 Scape oF Chapter ARA REA ee eek DN GOPR EP ERR ME e Ra 30 72 Introduction seres peu i Uv iav 30 73 Drive Diagnostics REYB 4 r d ler O RPL PWB 30 73 1 30 7 3 2 RAI A AAA SER A 31 73 3 UPD aaa AS a duod AS AA a I 31 73 4 VSN arar A RA ls 31 73 5 EMV E m 32 73 6 PRM ok nee DNE AS AR NS
69. e retained properly This format must be intact before the drive may be initialized for any operating system or data storage using Corvus initialization software First turn the FORMAT to the ON right position then execute the Format utility Some versions of this utility request a password which is HAI When the Format has completed the program will display FORMAT COMPLETE NOW UPDATING FIRMWARE ENTER CONTROLLER CODE FILE CFxx x The program will now rewrite the Controller Firmware using the input file displayed If another version of firmware is to be used enter the filename now Use only the Controller Firmware version appropriate for the drive see UPDATE utility above The Format program writes default Drive Parameters to the drive Spare Track table No Tracks Spared VDO table Drivel 0 Interleaving Spec 9 and should be updated as necessary after the Format program terminates see UPDATE above and PARAMETERS below 7 3 6 PRM The Parameter option of the diagnostic program allows the checking and alteration of the Constellation Mulitplexer parameters including Master Multiplexer Configuration table and Polling Parameters and Drive parameters including Spare Track table Sector Interleaving Specification and Virtual Drive Offset table 7 3 6 1 MUX Selecting this option displays the Multiplexer table lt lt lt lt LS x As displayed above the Multiplexer table is not to be altered if the drive is not conn
70. ealed mechanism RECOMMENDED REPAIR Check and adjust Check voltage and adjust Check dc power connector for continuity and proper connection at drive Replace power supply Adjust brake mechanism Replace drive sealed mechanism Check and set properly Replace interface card Replace interface cable Replace Controller ROM Replace Controller PCA Replace backplane Set switches correctly Replace Controller ROM Replace Controller PCA Replace drive mechanism Turn on FORMAT switch toggle RESET switch Replace drive sealed mechanism Replace Controller PCA Replace drive sealed mechansim defective B Busy LED lights and Drive format blown Reformat drive remains lit Controller ROM defective Replace Controller ROM Controller PCA defective Replace Controller PCA Drive sealed mechanism Replace drive mechanism defective 51 SYMPTOM CRC FORMAT CHECK will not begin or finish A Busy LED lights and remains lit or FAULT LED only remains lit Unable to spare track A LEDs off and remain off Drive will not execute Servo Exercise under Diagnostic A Busy LED remains lit Computer boots into monitor Apple A Drive goes BUSY then READY Drive will not Boot A Busy LED lights and remains lit CORVUS DEALER SERVICE CAUSES Front bezel switches incorrect Controller ROM defective Format not intact Controller PCA defective Drive sealed mechanism defective Controll
71. ecode drive commands as well as the stepper motor and read write electronics This test will also verify the condition of the drive media The CRC test will report either no errors or the cylinder head and sector numbers of the faulty sector Ifthe CRC errors are encountered the complete track must be spared PRM option drive Diagnostics Corvus User Guide 47 Fault Isolation CORVUS DEALER SERVICE Sometimes the CRC test will not begin READY LED remains lit or will not finish BUSY LED flickers momentarily and then the READY LED alone lights A misadjusted power supply or improper format could cause this Also a damaged copy of the CRC program could cause problems making it impossible to trace problems without a known good copy of the utilities 8 5 4 4 Controller Communication If the drive does not respond to the CRC test this may be due to several causes First some simple oversight may be the cause see On Site Checks above Alternately the controller may not be properly decoding the commands sent from the Host Computer due to incomplete Controller Firmware resident in RAM or to a defective component on the Controller PCA or the drive mechanism itself may have a defective component Executing the Controller Diagnostic DOWNLOAD command will attempt to establish communication with the Controller PCA The diagnostic software will respond with Programs Loaded To Controller Memory if this succeeds Further diagnostic comm
72. ected to a Corvus Multiplexer network or is connected to a single Host Multiplexer Only if a Master Multiplexer is used in the Multiplexer Network is this table to be changed In the instance that a Master Mux is installed each of the eight ports M in the above table should changed to either N if no device is connected to the port if a computer other than a DEC System LSI 11 is connected to the port L when LSI 11 is used or left an if a Host is connected to that port 32 Diagnostics CORVUS DEALER SERVICE There is only one table and it should be changed to reflect the configuration of the Master Multiplexer only or left unchanged if only a Host Mux is used Polling Parameters is the next option of the program When the drive is used with a Corvus Multiplexer local network with Intertec Superbrain or Radio Shack TRS 80 computers the Polling Parameters should be changed Standard Polling parameters 180 26 32 0 For Superbrain and TRS 80 180 52 32 0 7 3 6 2 DRIVE Selecting this option displays the Spare Track table Sector Interleaving Specification and Virtual Drive Offset table Whenever track is found to contain a faulty sector viathe test that track must be removed from service and a spare track used These bad tracks are eliminated by listing them in the Spare Track table This utility enables the user to ADD a track to the Spare Track table rem
73. ecute the FORMAT program without having physical access to the drive The switch being turned ON alone will not format the drive Only the combination of the format software and the FORMAT switch will allow one to format the drive If this switch is ON during normal operations communication between the drive and the host system may be impaired Located furthest to the right the RESET switch is a spring loaded momentary contact toggle switch Toggling this switch initiates a reset signal which resets the intelligent controller in the drive to its original power on state the heads re zero and disk Controller Firmware is again loaded in from the disk into the controller RAM The drive is then ready to accept another command from the host processor 3 4 Power On Sequence No specific sequence need be followed when powering on the Corvus disk system with one exception If the Corvus disk drive is used with an OMNINET local network power on the Disk Server first Next power on the disk drive then the host computer This procedure supersedes all other procedures that may be found in previous Corvus publications 3 5 Environmental Requirements All working environments contain possible hinderances to proper operation of electronic equipment The following are some possible environmental problems and their solutions 3 5 1 Static Electricity Static voltages of thousands of volts can be generated in most office environments If a system shows irregulariti
74. ed after FORMAT Interleaving Spec all H Series drives 9 Be sure to check the drive parameters before and after formatting the drive If the drive has ever hada track spared the Spare Track table and VDO table may need reconstructing before the data is restored Knowing what tracks are spared prior to formatting the drive will simplify this procedure Note on the label any future tracks spared CORVUS DEALER SERVICE Installation 2 4 Environmental Considerations electronic equipment needs cooling and the Corvus disk drive is no exception When installing do not pigeon hole the drive There should be sufficient open area both front and rear Place the drive on a level hard surface without cushion or carpet the air intake slots are on the bottom of the cabinet and must not be restricted Do not place a video monitor on top of or near the Corvus drive Electromagnetic fields generated by this device may cause drive malfunction Be sure the proper line voltage has been selected and proper fuse size is installed Insure the interface cable is properly connected between the connector on the interface card in the host computer and the PROCESSOR connector on the rear bezel of the Corvus disk drive cabinet Be sure the one edge edge with dark stripe is to the right when facing the rear of the drive unit Connects to Connects Connects Video Remote to Interface to Add on Air Flow Slots Control Card Drive If any
75. ee sur 2 5 MOTOR FEEDBACK A MATERIAL SCALE 587 47 ni LAWY SY 7 12 37 77 82 FINI CKO DATE READ WRITE LOGIC gt WR FAULT SHT 2 E 50004 UNLESS OTHERWISE SPECIFIED d nana gt A 4 9 zes 02381 201 vn man SHEET REV em T 8 7 6 5 4 3 2 1 8l W RPI gt 2 Ji 4 SEL 2 CT one 1 11 18 HD SEL 2 C9 HD SEL 2 31 16 ver pes 3110 UNSAFE 434 15 334 13 4 J 1 4354 1 J34 8 3134 11 J34 12 3 23 4 000 42 2 4 6 8 11 12 15 16 19 20 34 6 INDEX 5 4 112Yy 74 275 LUIS 2 7K 2 76 204 R73 1 8K 2 O 514 uz 4 5 e R12 8K 4 71406 5 E tus RT a R2 1 8K LZK 1 2K U3 1 RIO R9 SHT ZERO SENSE J34 3 gt YL 2 SUT 1 WRITE FAULT Sur 1 READY un 269 PRY SELECT I onza gt 98v SELECT 2 1 30 gt ER SELECT 3 AL Iie 37 SELECT 4 5 2 HPSO82 2635 CRIZ 20 34 9 O Syrg QPTONA RESET HPSOBZ 2835 A 5471 25 6 SEL 2 zac 2232 sum E SES o 29222228 257 2 5 CONTROLLER RESET SHT SET SEEK COMPLETE SV 2 i 17 3 A a eae Ng E iO RIO LSI4 1406 530 5V RESET SEEK COMPLETE sur 257 3 SHT RESET
76. ent such as photocopy machines heating and cooling equipment elevators etc To lessen the impact of frequent power interruption the use of an uninterrupted power supply UPS is recommended 3 5 3 Temperature Although in most environments the disk drive needs no actual warm up time there are temperature limits that the drive must operate within see Specification at beginning of this manual The temperature change maximum for the Corvus disk is 15 degrees fahrenheit per hour 3 6 Periodic Maintenance Inherent in the design of the Winchester technology disk devices is the freedom from the need for regular preventive maintenance The sealed disk mechanism of the Corvus disk drive requires no maintenance and contains no field serviceable components CAUTION Since contamination of the atmosphere in the mechanism necessitates replacement of the unit removing the cover to the sealed mechanism voids all warranties 3 6 1 Regular Checks Power supply voltages will change with time and should be checked periodically Each time the Corvus drive cabinet is opened check the power supply voltages to verify that they are within specified tolerances refer to chapter 7 for adjustment procedures Due to slight oxidation build up on cable connectors and IC pins reseating the flatcable and power connectors and socketed controller ICs periodically will also help insure reliability I i CORVUS
77. er ROM defective Controller PCA defective Drive sealed mechanism defective Maximum number of tracks already spared 31 total Power supply voltages misadjusted Drive sealed mechanism defective Boot image corrupted Boot program on Corvus utility diskette corrupt Boot ROM on interface PCA bad Interface PCA defective Drive does not contain boot image Boot ROM on interface PCA defective Interface PCA defective 52 RECOMMENDED REPAIR Check switch settings Replace Controller ROMs Reformat drive Replace Controller Replace drive mechanism Replace Controller ROM Replace Controller PCA Replace drive mechanism Replace drive mechanism Check voltages adjust or replace supply as needed Replace drive mechanism Recreate boot image see Corvus user guide Recreate boot image using good copy of utilities Replace Boot ROM Replace Interface PCA Create boot image on drive see user s manual Replace Boot ROM Replace Interface PCA CORVUS DEALER SERVICE SYMPTOM B READY light remains lit 9 errors during normal operation A Normal LED display or all LEDs off and remain off 10 Heads slam against inner crash stop toward hub A Busy LED lights and remains lit 11 Sector destroyed during normal operation A Busy LED lights and remains lit CAUSES Controller ROM defective Controller PCA defective Drive sealed mechanism defective Mirror switch
78. er pins as well as at the power supply will verify that the power connector and cable are in good condition Inspect the dc power cable checking for breaks at both ends The power cable may be faulty if the voltages are not present at the drive Backplane Symptoms indicating power supply failure or misadjustment include front bezel LEDs failing to light drive motor failing to turn or speed fluctuating and drive going off line drive error 255 and CRC errors Dc output of the power supply is a function of the correct ac input the dc voltages will not be correct if the improper line voltage is selected To verify that the proper line voltage has been selected locate the CORCOM unit on the rear bezel of the drive cabinet This unit contains the fuse and voltage selection PCA If the voltage is changed be sure that the line fuse is also changed Symptoms indicating incorrect line voltage selection include dim or dark LEDs low motor speed and extreme heat output 8 5 3 4 Drive Electronics If the READY LED will not light and the power supply is operating properly and the voltages are within tolerance itis probably due to a faulty component within the drive Sometimes symptoms indicating a faulty drive PCA are in fact caused by poor contact between connectors Power supply connectors PCA edge connectors IC sockets and switch contacts are some of the connectors which may lose contact and result in a malfunctioning drive Reseating all connectors
79. eration and a seek error is returned to the host operating system 4 9 2 2 Controller During Read and Write Commands The read command begins with the command bytes are received from the Host Computer in parallel form via the Interface PCA This command will be unique for either a 128 256 or 512 byte sector read The requested sector number will accompany the command bytes 16 Drive Description CORVUS DEALER SERVICE STEPPER MOTOR HEADS CAPSTAN BAND CARRIAGE Figure 10 Stepper Motor Assembly The controller will calculate a difference value between the current cylinder and the cylinder containing the destination sector The drive mechanism will be commanded to seek to the new cylinder and the correct head selected The controller is now ready to read in the data from the sector and waits for the appropriate sector to be positioned under the head READ is asserted and the 7 80 relinquishes control to the discrete DMA state machine which captures the data signal in MFM form from the headstack microchip via the bi directional data bus The data is amplified filtered and shaped squared before being converted to to NRZ format The Controller PCA handles CRC error checking parallel to serial conversion and transfer of the data to on board RAM and then to Host Computer RAM once control is returned to the Z 80 A return code is sent to the host computer identifying the success of the command The drive contro
80. erpreting Error Codes Depending on the condition of bits 5 7 there are up to four different error codes for each error condition To determine the actual error condition these procedures should be followed 1 If the error code value is greater than or equal to 128 a fatal error occurred Subtract 128if the value is greater than or equal to 128 2 Ifthe remaining value is less than 64 the error occurred during a disk read If the value is greater than or equal to 64 the error occurred during the verify portion of a write command Subtract 64 if the value is greater than or equal to 64 3 If the remaining value is less than 32 retrys were attempted If the value is greater than or equal to 32 at least one retry was attempted before the error was reported If no error has occurred the original error code value of zero will be returned Consistent 171 235errors at the same block location indicates bad disk media Execute the CRC test and follow the instructions for sparing tracks PRM option drive Diagnostics Consistent 255 errors indicate that the Controller PCA is not responding to command s sent from the Host Computer and may need replacing 41 Fault Isolation CORVUS DEALER SERVICE Table 8 1 Decimal Disk Error Codes lt 127 2128 Non Fatal Fatal 32 soft error 192 224 error in preparing R W 193 225 seek timeout 194 226 seek fault 195 227 seek error 196 228 header CRC error 197 229
81. es These three drive models Model 6 Model 11 and Model 20 are all physically identical The disassembly instructions that follow apply to all 5 2 Introduction The Corvus H Series drive consists of a high impact plastic shell the top and bottom halves held together with two screws at the rear of the cabinet The backplane has two edge connector slots which accept the Mirror PCA when installed and Controller PCA and a 20 pin flatcable connector which accepts the cable from the front bezel Paddleboard PCA Allthese are mounted to the drive cover The drive sealed mechanism and power supply are both attached to the cabinet basepan WARNING Before disassembling any disk equipment be sure the power is disconnected 5 21 Tools Required The following tools are required for disassembly of all Corvus H series drives 1 2 phillips screwdriver 2 5 64 inch hex driver 3 3 32 inch nut driver 4 3 16 inch blade screwdriver 5 3 Plastic Package The H Series drives share the grey plastic drive cabinet with the Corvus Rev DandE 6MB disk drives Disassembly is similar 5 3 1 Cover 1 Remove the two phillips screws at the rear of the cover 2 Remove the cover by sliding it back and lifting it straight up Be careful not to stress the dc cabling and flatcables connected to the Controller PCA and the Backplane PCB 5 3 2 Controller PCA 1 Remove the drive mechanism flatcables from the upper connectors of the Controller PCA not
82. es whenever an operator comes in contact with the host computer network or peripheral equipment supporting table or surface static should be suspect CORVUS DEALER SERVICE Operation Static is most easily generated in a cool and dry enviromnent usually associated with cold weather Since increased humidity helps prevent static electricity buildup some type of humidifying device can be helpful Ideal relative humidity is 70 percent to 75 percent 3 5 2 Line Noise Electrical noise on the power line is major cause of inconsistent equipment operation Voltage spikes brownouts and dropouts as well as low line voltage are just some of the common causes of drive malfunction Located in the CORCOM power selection unit is a line filter capable of handling most minor electrical noise on the power line Also the power supply is capable of handling dropouts of up to three complete power cycles If power is suspect the problem may lie in poor continuity of the building wiring noisy or high power consumption devices on the same circuit or poor external supply to the building Power can be improved by including a constant voltage regulator or isolation transformer in the power circuit The constant voltage regulator will help minimize the effect of line voltage fluctuations on the Corvus drive while the isolation transformer will be effective in protecting the Corvus drive from line noise caused by other high load electrical equipm
83. es set incorrectly Front panel switches set incorrectly Interface board defective Interface cable defective Software currently running on host system defective Boot image corrupted Defective track Controller ROM defective Controller PCA defective Power supply voltages out of tolerance Power supply voltages fluctuating Drive sealed mechanism defective Controller Firmware corrupted Power supply voltages out of tolerance Power supply voltages intermittant or can t adjust Controller ROM defective Controller PCA defective Drive sealed mechanism defective Boot ROM where applicable or interface board defective RECOMMENDED REPAIR Replace Controller ROM Replace Controller PCA Replace drive mechanism Set switches properly Set switches correctly Replace interface board Replace interface cable Replace software with known good copy and reexecute Recreate boot image see user s manual Execute CRC FORMAT CHECK Spare any tracks returning errors Replace Controller ROM Replace Controller PCA Adjust power supply Replace power supply Replace drive mechanism Update Controller Firmware Check voltages adjust if necessary Replace supply Replace Controller ROM Replace Controller PCA Replace drive mechanism Replace boot ROM If problem persists replace Interface PCA 33 SYMPTOM 12 Motor speed varies 13 Low motor speed 14 Heads not rezero A BUSY
84. g format ccc h xxxxx where ccc is the cylinder number in decimal h is the head number in decimal and xxxx is the number of errors in decimal 3 TOTAL SEEKS This number represents the number of seeks the controller has performed so far The number will be in decimal 4 SEEK TIME This number represents the total time spent performing seeks in milliseconds The average seek time can be calculated by dividing seek time by the number of seeks 5 RPM These numbers represent the minimum and maximum speed of the drive during the execution of the sector quiet diagnostic 74 2 9 Q SECTOR QUIET PROGRAM CAUTION This command will DESTROY data on the disk Diagnostics CORVUS DEALER SERVICE This command instructs the controller to begin executing the sector quiet diagnostic This diagnostic is a very comprehensive test of the drive media and electronics The controller performs continuous seeks reads and writes at random locations on the disk The results of this test are obtained by the command documented in 74 2 8 The format of this command is return The controller will respond with YIN 2 Enter lt return gt to begin the test enter N to abort The controller will continue this test until a new command is issued 7 4 2 10 5 READ SCAN DISK This command instructs the controller to perform a sector verify pass CRC check The results of the scan will be added to the sector quiet results which are
85. he Controller Firmware has been disrupted or contains bad blocks the drive will not be READY after the power on sequence completes To determine if this is the cause of the symptom turn on the FORMAT switch and toggle the RESET switch This will reset the Z 80 Controller and if the drive passes the hardware self test will ignore the Controller Firmware If the READY LED now lights faulty Controller Firmware is indicated and the UPDATE utility must be executed to rewrite the Controller Firmware code After this has been done turn off the FORMAT switch and toggle the RESET switch This again will reset the Z 80 controller which will read the newly written Controller Firmware into the on board RAM The READY LED should now light 8 5 3 3 Power Supply Voltages If the fault has been determined to be a drive hardware failure the first action taken should be to check the power supply voltages Check the voltages when the drive is first recieved and because of line voltage variations between locations at the customer site also If any of the dc output voltages cannot be brought within tolerance the power supply must be replaced Using a Digital Voltmeter follow the voltage check and adjustment procedures outlined in the Adjustments section of this manual The de power connectors located on the PCA s underneath the sealed mechanism and on the backplane should be checked for a clean and tight fit Measuring the voltages at the drive Backplane pow
86. he condition of an individual track Some versions of the diagnostic utilities display only 40 characters on the video monitor When viewing the diagnostic menu under each specific item typing a question mark will display an additional 40 characters of menu options The latest release of Dealer Service Diagnostics cover all series of Corvus disk drives A Series 8 inch 11 MB Rev A drive B Series 8 inch 11 MB Rev B drive 8 inch 20 MB Rev B drive 5 25 inch 6MB Rev A through Rev E H Series 5 25 inch 6 MB Model 6 Rev A 5 25 inch 12 MB Model 11 Rev A Rev B 5 25 inch 18 MB Model 20 Rev A Rev B Diagnose the H Series drives using only diagnostics specifically labeled as service diagnostics for the H Series drives Previous diagnostics versions pre April 1 1983 will not communicate with the Corvus disk drive properly 73 Drive Diagnostics DRVDIAG This program is essentially the same program provided on the Initialization Utility diskettes supplied with each Corvus drive All options within this program are non destructive to data on the drive with the exception of the Format utility While the PARAMETERS option of the diagnostic program does not actually destroy data changing these values using this diagnostic option will change relative track and sector addresses which will make the data inaccessable 731 A good sector is defined as one capable of retaining all bits in the order they were written When a
87. he problem eliminated the repair process is only halfway completed Final checks and adjustments must be made and the drive tested thoroughly overnight before it may be returned to the user 8 6 1 CRC Test The drive media must be verified reliable before the drive can be certified as usable The CRC test should be executed before and after the drive image is restored with the Mirror to check that no sectors have been destroyed Tracks with faulty sectors should be spared using the PARAM option of the drive Diagnostics 8 6 2 Install and Test Mirror If a Corvus Mirror back up device was part of the original disk system it should have been removed from system as one of the first steps in troubleshooting the drive Having traced and replaced the faulty component in the drive the Mirror should now be installed and tested Refer to the Corvus Mirror Service Manual for procedures on troubleshooting and servicing the Mirror 8 6 3 CRC Test Executing the CRC test once again verifies that elementary communication exists and that no sectors were accidentally destroyed by restoring a faulty Mirror image 8 6 4 Power Supply After troubleshooting procedures have been completed the power supply voltages must be checked once again before the drive can be tested This is to insure that the Burn In test is testing a properly adjusted drive 8 6 5 Burn In Test The Burn In test is the final endurance test of the drive revealing any malfunctions as hard o
88. ing their orientation one edge to the left 2 Notetheorientation of the two flatcables one edge to the left connecting the drive mechanism to the Controller PCA and disconnect them 3 Ifthe drive has a Mirror PCA installed in the Backplane remove it by gently disengaging it from the standoffs and pulling it out of the backplane slot gt Remove the two nylon standoffs securing the controller to the cover 5 Remove the controller by gently pulling it out of the backplane slot 20 Disassembly CORVUS DEALER SERVICE 5 3 3 Backplane PCA 1 Disconnect the one dc power cable and one flatcable from the Backplane noting their orientation one edge to the left 2 Release the forward half of the Backplane PCA from the nylon standoffs 3 Remove the five nylon standoffs securing the Backplane to the cover 4 Remove the Backplane PCA by moving it down and forward NOTE The ground wire connecting the drive mechanism to the power supply MUST be connnected for the drive to perform properly 5 3 4 Drive Mechanism 1 Disconnect the ground wire between the drive mechanism and the power supply Remove the four phillips screws securing the drive mechanism mounting brackets to the basepan Noting the orientation of the dc power cable and flatcables disconnect them from the drive mechanism Remove the drive mechanism with its brackets up and out of the basepan omo ww N Remove the four phillips screws securing
89. is recommended as a minimum for troubleshooting and repair of the Corvus disk drive 1 Digital voltmeter 0 1 percent accuracy with test leads 2 Host microcomputer Corvus Concept 256K or Apple 48K Corvus Interface and 34 pin flatcable 3 Corvus Dealer Service Diagnostic Utilities diskette currently these are available for the Corvus Concept and Apple II computers 8 4 Error Codes For each command sent to the drive by the host operating system a single byte error code is returned after the commmand is completed It is the responsibility of the operating system to interpret the error code and take appropriate action All errors reported by the Corvus Diagnostic Utilities are in hexidecimal notation Errors returned by the controller are listed below Errors less than or equal to 127 are non fatal Those errors greater than or equal to 128 are fatal errors The bit format of the error code is shown below bit bit bit bit bit bt bt bit 7 6 5 4 3 2 1 0 The eight bit error code is broken into four segments Bit 7 when set indicates that the reported error is a fatal error Bit 6 when set indicates that the reported error occurred during the verify read after write sequence of the write command Bit 5 when set indicates that one or more retrys were attempted before the error was reported Bits 0 4 represent one of the 21 codes which describe the error refer to the error lists in this section 8 4 1 Int
90. it Assembly The Printed Circuit Board assembled with all its components PCB Printed Circuit Board Epoxy board with a copper circuit etched onto it The PCB is the bare board without the usual components such as resistors transistors and integrated circuits PLATTER circular disks coated with a magnetic oxide that will retain a magnetic flux induced by the read write heads Both surfaces of each platter contain data The 10 megabyte drive has two platters while the 20 megabyte has three REAR BEZEL the rear most panel area of the cabinet containing the flatcable connectors for the interface cable video connectors power cable and fuse holder Serial number is located on the rear bezel also SECTOR each track is divided radially into 20 segments Each segment is one sector and contains one block of data one CRC value and header information required by the disk controller SINUSOIDAL WAVE a wave form that represents periodic oscillations TRACK all points on one surface with the same radius Tracks are configured concentrically on each surface WINCHESTER TECHNOLOGY a unique design first developed by IBM as a means to reduce the size of a disk drive while increasing its capacity and removing the posibility of contamination of the disk components The result was a disk unit much smaller than the traditional 14 inch disk platters with equivalent capacity This is due to new head design and the use of the sealed environment used with the
91. layed for example SLOT NUMBER 2 CURRENT TIME 0 75 TOTAL ERRORS 0 HARD ERRORS 0 SOFT ERRORS 0 DO YOU WANT A COMPLETE LIST Y N Slot number refers to the host slot to which the disk drive is interfaced to Current time refers to A the pass number and B the current chunk being tested Errors are those disk read or write errors which after 15 re reads or 3 re writes are still in error Soft errors are those read or write errors which after at least one retry have been corrected Requesting a complete list will result in a display of the specific tracks with the error results for each refer to section 7 4 for detailed information on error codes 7 5 3 R ESTART Entering will begin the program again from the beginning All error counters will be re zeroed 38 Diagnostics CORVUS DEALER SERVICE 754 Entering Q will return to the Dealer Service Diagnostic menu 7 6 READ BURN IN RESULTS This program allows the burn in results of all drives to be output to the video display or printer SLOT NUMBER n CURRENT TIME p cc TOTAL ERRORS x HARD ERRORS y SOFT ERRORS z followed by a detailed listing of all errors where is the number of the slot that the drive is connected to is the pass number is the current chunk being tested and x y and z are the total errors hard errors and soft errors respectively 7 7 Track diagnostic The Track
92. le in the drive sealed mechanism the groundstrap consists of a copper metal strip terminating with a carbon button which rides on the spindle end This device discharges any static charge which may build up on the platters or spindle HEAD in the Winchester disk very low mass glass ferrite aerodynamic shaped component containing a wire winding There is one head for each data surface which float 18 microinches above the platters on a cushion of air When current passes through the winding an electromagnetic flux is induced into the platter surface representing a bit HEADSTACK casting to which all heads are attached Located in the top of the headstack is the microchip responsible for head selection and signal buffering IC Integrated Circuit A hybred densely populated wafer of silicon containing many resistors and transistors 56 CORVUS DEALER SERVICE MEGABYTE one million bytes MFM MODIFIED FREQUENCY MODULATION a method of writing information on a magnetic surface which allows a higher bit density to be used therefore increasing storage capacity while decreasing size MOTOR CONTROL printed circuit board responsible for monitoring the spindle motor speed and adjusting this as necessary NRZ NON RETURN TO ZERO digital representation of information used by microprocessors PADDLEBOARD the small PCA located on the front bezel which contains the three LEDs and four function switches PCA Printed Circu
93. ller handles data in 512 byte quanties only Host defined sector sizes less than 512 bytes are handled by storing multiple sectors in each 512 byte Corvus sector CORVUS DEALER SERVICE Drive Description Similarly the write command begins when the command bytes along with the associated sector address es are received The 7 80 controller then determines whether the write command is for 128 256 or 512 bytes depending on the host system s standards and relinquishes control to the DMA circuitry for transfer ofthe data from host memory to the on board controller RAM Next preparations are made for writing that block out to the disk Ifthe quantity of data to be written is less than 512 bytes the sector is first read into controller RAM When the proper sector comes around the controller again turns control over to the DMA circuitry The drive processor again is put into a wait state while the transfers data bytes one at a time to the parallel to serial converter A CRC value is generated from the serial data and inserted in the data stream The data is converted from NRZ format into MFM format and then directed to the read write heads for writing to the sector The CRC information is used during a read for checking data integrity The disk write operation is concluded by reading in the block and its associated CRC byte to verify its success Every write command is followed by a verify read command A status byte is then sent to
94. lowing is a sample serial number to be found on a Corvus H Series Model 11 disk drive 023 BH350 M and is decoded below 02 represents the week of manufacture week 02 3 represents the year of manufacture 3 for 1983 represents a Model 11 drive A Model 6 C Model 20 H represents an H Series drive 350 represents the serial number of that years REECE IM represents that this drive was shipped with a Mirror installed internally Whenever communicating with Corvus in reference to Corvus products include the serial number of the equipment involved Corvus Systems is a registered trademark of Corvus Systems Inc Mirror is a registered trademark of Corvus Systems Inc H Series is a registered trademark of Corvus Systems Inc 7 80 is a registered trademark of Zilog Inc General Description CORVUS DEALER SERVICE 1 5 The Corvus Disk System The Corvus Mass Storage Disk System utilizes a sealed 5 25 inch Winchester disk mechansim manufactured by International Memories Inc IMI The drive with its intelligent controller is designed as a plug in device requiring minimal software setup Interfacing to host computers is via 34 pin flat cable interface Installation and setup procedures are covered in the corresponding Disk System Installation Guide and Disk System User Guide for the appropriate computer system All H Series drives consist of a 5 25 inch drive mechansim with integral Read Write PCA and Motor
95. n 3 Remove the bezel straight forward 24 CORVUS DEALER SERVICE CHAPTER 6 ADJUSTMENTS AND MAINTENANCE CORVUS DEALER SERVICE Adjustments CHAPTER 6 ADJUSTMENTS AND MAINTENANCE 61 Scope of Chapter This chapter will cover check and adjustment of power supply voltages brake solenoid and index detector 6 2 Introduction The Corvus disk system is based on a Winchester disk mechanism Because of this storage device s sealed environment the mechanism itself needs no preventive maintenance 6 3 Power Supply Voltage Check and Adjustment Aging of the power supply and normal heating and cooling of the drive electronics can cause the power supply voltages to drift Voltages should be checked each time the installation is visited for system checkout All three H Series drives use the same power supply the CP510 and is interchangible between all three H Series drives WARNING Extreme cautlon should be exercised when adjusting the power supply High voltages present a potential hazard 6 3 1 Voltage Check 510 1 Remove cover to the enclosure as outlined in chapter 5 2 Locate voltage test points at the edge of the CP510 power supply These labeled 12V 12V COM 5V 5V COM 3 Turn on the ac power switch 4 Using a DIGITAL voltmeter check the power supply voltages at these connections using the corresponding COMMON test point All voltages must be within 0 1 volts of the specified voltage 5
96. nd then report the average seek time in milliseconds This number should 70 ms 2 5ms if the servo is within tolerance 8 inch drives only 7 4 2 6 J SINGLE DO SEEK This command instructs the controller to seek to the cylinder specified in the command It is used to move the heads to a specific cylinder to observe servo tracks The format for this command is ccc J Creturn gt where ccc represents the desired cylinder number in hexidecimal Since the 5 25 inch drive has no servo tracks this utility is limited to use on the 8 inch drives 74 2 7 L FULL CYLINDER LOOPSEEK This command instructs the controller to continuously seek from cylinder zero to maximum cylinder This command can be used to check servo action and to adjust the servo board 8 inch drives only or as a general servo exercise utility for all drives The Controller will continue seeking until a new command is issued The format for this command is L return 74 2 8 P PRINT QUIET SUMMARY REPORT This command allows the operator to view the results of the sector quiet seek scan read scan and write scan commands The results are printed in the following format 1 SEEK ERRORS Seek errors are represented in the following format ccc ddd ee where ccc is the desired cylinder in decimal ddd is the cylinder in decimal which was actually found and ee is the error code See the error codes in section 8 4 3 2 CRC ERRORS CRC errors are represented in the followin
97. nly with a tested known good replacement 8 5 4 8 Interface Components A defective Interface PCA or cable may be the cause of problems with the drive Replace both only with tested known good replacements and reinstall originals one at a time retesting the drive after each 8 5 4 9 Drive Initialization Corvus provides drive initialization software for each computer operating system CP M Apple DOS UCSD Pascal NEWDOS IBMDOS CCOS etc These utilities initialize the platter surface for accepting a DOS boot image where applicable as well as directory and data area These areas of the disk if disturbed either physically or magnetically will no longer retain the correct information sought by the CATALOG or DIRECTORY listing commands In this case the initilization procedures i e PUTGET PSYSGEN or BSYSGEN must again be executed to properly initialize the disk surface refer to the Corvus User Guide for initialization procedures Be sure to use archival known good copies of all software whenever initializing the drive 48 CORVUS DEALER SERVICE Fault Isolation problems persisting at this point lie either with the drive electronics or the disk media The electronics should be tested and if this is not found to be the cause of the problem the drive should bere initialized using anew copy ofthe software utilities 8 6 Final Adjustments and Tests When the faulty module in the drive has been replaced and t
98. ociated Read Write PCA and the Mirror PCA The controller reports back to the Host Computer via a 34 pin flatcable the success of the command executed by means of one byte return code A return code of zero is returned if no errors occur See Error Code Chart in Troubleshooting section for non zero return codes The Controller PCA contains the 4MHz Z 80A CPU and Z 80A support ICs as well a 4K controller ROM containing elementary procedural Z 80 code for the intelligent controller and 5K of on board RAM used for buffering data to and from the disk and storing utility code loaded from the Controller Firmware area of the disk The three Z 80A PIO ICs are used to buffer signals to and from the host Interface PCA Corvus Mirror and network devices drive sealed mechanism and the front bezel controller switches and LEDs In addition one of the PIO ICs monitors the on board CRC generator checker IC and informs the Z 80 CPU in the case of a CRC error All disk to controller memory and controller memory to disk data transfers as well as all controller memory to Host Computer memory and Host Computer memory to controller memory data transfers are handled by discrete Direct Memory Access DMA circuitry This DMA state machine is responsible for fast memory transfer during the execution of read and write commands The Controller PCA receives MFM read data from the Read Write PCA and converts it to NRZ read data before passing it on to the Host
99. odes 64 62 61 60 259 58 57 56 55 54 53 52 51 50 49 48 47 44 soft error error in preparing R W seek timeout seek fault seek error header CRC error rezero timeout rezero fault drive not online write fault format protected read fault data CRC error sector locate error write protected illegal sector address illegal command op code spare track table overflow overlay failure verify error burn in test controller timeout diagnostic utilities CORVUS DEALER SERVICE Fault Isolation 8 5 Troubleshooting Procedures When a disk drive fails to function normally the problem may range from a faulty sector to total drive failure It isthe responsibility of the service technician to interpret the symptoms isolate the faulty component substitute a replacement and thoroughly test the drive before returning it to the user Corvus provides its Authorized Servicing Dealers with diagnostic utilities and service documentation to aid the technician in servicing Corvus products The Dealer Service utility diskettes include diagnostics for testing all phases of drive operation These utilities are described in the section titled Diagnostics Also included in this chapter is a list of Common Symptoms and Solutions In using the troubleshooting aids provided take the following precautions 1 Make sure all drives have the appropriate version of Controller Firmware 2 See
100. ove it from use DELETE a track from the Spare Track table restore it to use LIST the Spare Track table QUIT or exit from the spare track routine By selecting the ADD option the track number returned by the CRC test see CRC below can be entered thereby ignoring the track with the erring sector The Sector Interleaving Specification is the next option of the program Interleaving or skewing is defined as the use of an offset constant in the logical numbering of sectors This value for all H Series drives is nine for allcomputer systems except the DEC System LSI 11 which uses a value of five Sector Interleaving is shown in Figure 8 Check the Interleaving Specification when the drive is first received and whenever it is formatted Next the Virtual Drive Offset table should read DRIVE 1 0 unless otherwise instructed by the Corvus Disk System Installation Guide This table should be checked when the drive is first received and whenever the drive is formatted Model 20 disk drives must be configured as two virtual logical drives This is accomplished by adding a second virtual drive beginning at track 911 73 7 SET This utility allows the user to change the slot number drive number or drive type of the drive to be diagnosed This allows the technician to connect several drives to one host computer and test any one 73 8 PARK HEADS Whenever the H Series drives are to be transported the heads must first be parked off the data
101. ove the two standoffs and one slot screw noting their respective positions and remove the Motor Control PCA 21 CORVUS DEALER SERVICE Disassembly STEPPER MOTOR CABLE MOTOR CONTROL BOARD AS RON i Ji A HR READ WRITE AND HEAD SELECT CABLE ED gt MOTOR CONTROL 4 amp BOARD CONNECTOR LED CABLE N STEPPER MOTOR READ WRITE BOARD Figure 11 Read Write PCA Removal 22 Disassembly CORVUS DEALER SERVICE SPINDLE MOTOR CABLE BRAKE CABLE ZERO TRACK SENSOR CABLE INDEX SENSOR MOUNTING SCREWS 2 CZE Figure 12 Motor Control PCA Removal 23 CORVUS DEALER SERVICE Disassembly 5 3 7 Power Supply Disconnect the ac wiring harness connector from the rear bezel CORCOM unit and power switch Remove the screw securing the ac groundwire to the power supply Remove the screw securing the dc groundwire to the power supply Disconnect the ac fan cord from the cooling fan 1 2 3 4 Disconnect the dc wiring cables from the drive mechanism and the Backplane 5 6 Remove the four phillips screws securing the power supply to the basepan 7 Remove the power supply straight up and out of the basepan 5 3 8 Front Bezel 1 Remove the flatcable from the front bezel Paddleboard PCA noting its orientation one edge down 2 Remove the three phillips screws securing the front bezel to the basepa
102. pection may be made and a damage report filed Also if the damaged equipment is a new product Corvus Order Processing Department must be contacted for proper return procedures If the damaged equipment is a recently serviced product being returned under an RMA number Return Merchandise Authorization number contact Corvus Customer Service Department for proper return procedures The disk drive mechanism in the Corvus disk system is an extremely sensitive device Subjecting the drive to a one g force one gravity will be amplified and transmitted to the heads impacting them onto the platter with a 100 g force This necessitates very careful handling of the drive mechanism both in shipping and operation When a drive is received check that all chips in the 7 80 Controller PCA are seated well in their sockets Chips coming loose during shipping account for a percentage of the failures upon reciept 1 Remove the two screws securing the cabinet cover to the drive basepan at the rear and remove the cover Be careful not to stress the dc power cable and flatcables connecting to the Controller PCA and Backplane PCA 2 Locate the Mirror PCA if installed plugged into the lower of the two card slots of the backplane and remove it 3 Locate the Controller PCA installed behind the Mirror PCA and press firmly on all socketed chips seating them securely into their sockets 4 Replace Mirror PCA 5 Replace drive cover and secure with screws 2
103. plemented in the high level program such as base conversions slot selection and the driver which downloads the code to the drive controller Host system machine code The machine code provides the low level interface to the drive controller It transmits and receives data from the controller according to the parameters passed to it by the high level program It is slot selectable and contains a one second time out feature which allows the program to recover if the drive is not responding Z 80 code The Z 80 code is the heart of the diagnostic and is the largest portion of the program It performs the commands which are passed to it by the high level program via ASCII characters It consists of three blocks of code which are loaded to different locations in the controller memory 7 4 2 Controller Diagnostic Commands The following is a detailed description of each function of the Controller Diagnostic Please note that there should be no spaces in the commands unless the notation lt space gt is specified Whenever the entry of a Controller Diagnostic command results in the response x YIN where x is thecommand entered be sure the continuation of this test is appropriate these commands are destructive to data During normal operation when an error is encountered the controller will repeat the operation in an attempt to succeed All errors returned by the Controller Diagnostic are reported without retrying the command 7 4 2 1 A ABOR
104. r soft errors This program tests the seeking reading and writing abilities of all drives connected to the host computer The Burn In test should be run at a minimum overnight after all repairs and adjustments on the drive have been completed If any sectors experience errors the Track Diagnostic program should be executed for all tracks containing suspect sectors to determine if these are recurring errors If the errors persist the tracks should be spared drive Diagnostic utliity PARAM 49 BEGIN DO QUICK CHECKS BACKUP DATA CHECK PS VOLTAGES REPLACE PS YES IF NECESSARY DRIVE READY NO REPLACE CONTROLLER rca DRIVE 4 READY 2 O N REPLACE DRIVE MECHANISM DRIVE READY 2 O REPLACE PADDLEBOARD PCA YES DRIVE READY ERROR IN FOLLOWING FLOWCHART TROUBLESHOOTING FLOW CHART DRIVE READY TURN ON FWT SW TOGGLE RES SW DISCONNECT ALL EQUIPMENT FROM DRIVE USE KNOWN COMPUTER AND SOFTWARE MIRROR NETWORK COMPUTER YES UPDATE CONTROLLER DAIVE FIRMWARE BEADY TURN OFF 5 FORMAT SWITCH CHECK PS VOLTAGES REPLACE PS IF NECESSARY FAULT NO PERSISTS Y 2 YES REPLACE CONTROLLER PCA REPLACE DRIVE MECHANISM FAULT PERSISTS 2 YES ERROR IN FOLLOWING FLOWCHART RE CONSTRUCT NO BOOT IMAGE RE INITIALIZE NO YES DISK DRIVE BOOT OPERATING SYSTEM AUTO B
105. ring or air cushion Since bit density is closely related to head media clearance and head mass disk drives utilizing Winchester technology can achieve large storage capacities at a premium of space An added advantage of the Winchester sealed mechansim is that it requires regular maintenance Panasonic is a registered trademark of Panasonic Inc CORVUS DEALER SERVICE CHAPTER 2 INSTALLATION CORVUS DEALER SERVICE Installation CHAPTER 2 INSTALLATION 2 1 Scope of Chapter This chapter discusses installation of the disk drive hardware as it applies to environmental requirements to insure proper operation Installation and operation procedures for the Corvus disk system are outlined in the Corvus Disk Systems Installation Guide and Corvus Disk Systems User Guide 2 2 Introduction Each drive when it is received should be checked for shipping damage and tested for proper function This chapter contains these check out procedures as well as those for installing single drives and multiple drive systems 2 3 Receiving a Drive Any time a drive is received several checks should be performed before the drive is installed at the customer site Each Corvus disk drive should be carefully unpacked and checked for shipping damage External evidence of rough handling may be symptomatic of damage to fragile mechanisms within the drive NOTE Any damage claims must be reported to the local office of the shipper so an ins
106. rrors operations that succeed after at least one retry Pressing RETURN displays the error list consisting of total number of passes seeks hard and soft errors Any errors reported should be followed by a CRC test to check for faulty sectors 23 3 UPD This Controller Firmware Update utility rewrites a new copy of Controller Firmware into each of the first two cylinders of the drive All H Series drives must use Controller Firmware version CF18 3 or greater Since it is not possible to update the firmware on the boot drive the system MUST first be booted from another boot device another Corvus Drive or floppy diskette The H Series version of this utility will prompt you with Change Tables Y N A negative answer to this question will not endanger data resident on the drive Although the UPDate utility is non destructive to the data itself answering affirmatively to this will result in these tables being rewritten with default values Spare Track table No Tracks Spared VDO table Drivel 0 Interleaving Spec 9 Be aware that whenever these default table values are written to the firmware area by answering YES to Change Tables 2 they replace previous values that may have been written at an earlier time These may include spared tracks and virtual drives in addition to the default of 1 drive If data is resident on the drive when these values are changed all relative references to the data absolute sector addresses will b
107. s man ual at any time without notice Revised manuals and update sheets will be published as needed and may be purchased by writing to Corvus Systems Inc 2029 O Toole Avenue San Jose CA 95131 Telephone 408 946 7700 TWX 910 338 0226 This manual is copyrighted and contains proprietary information All rights reserved This docu ment 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 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 communica tions 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 equip ment in a residential area is likely to cause interference in which case the
108. s number refers to the total number of loops using 256 different patterns to write to those tracks The total reads and writes refers to the number of times the sector was written to and read from The number of reads should always be twice the number of writes 39 CORVUS DEALER SERVICE Diagnostics Hard errors are those disk read or write errors which after 15 rereads or 3 re writes are still in error Soft errors are those read or write errors which after at least one retry have been corrected 7 7 3 R ESTART Entering an R will begin the program again from the beginning All error counters will be rezeroed 774 QUIT Entering a Q will return to the Dealer Service Diagnostic menu 40 CORVUS DEALER SERVICE CHAPTER 8 FAULT ISOLATION PROCEDURES CORVUS DEALER SERVICE Fault Isolation CHAPTER 8 FAULT ISOLATION PROCEDURES 8 1 Scope of Chapter This chapter contains procedures for diagnosing and testing the Corvus H Series 5 25 inch disk drives Recommended test equipment is listed as are error codes A list of common failures and procedures pertaining to this chapter may be found at the end of this chapter 8 2 Introduction The drive is a sophisticated electronic device and may at some time fail When failure occurs it may be due to any of the drive components The following procedures will aid the technician in isolating the faulty component 8 3 Tools The following test equipment
109. sts of 512 bytes of data Externally the drive handles data in sectors as defined by the host computer Typically each host operating system defines a sector as 128 bytes 256 bytes or 512 bytes The Corvus interface software uses the appropriate read and write commands one each for writing and reading 128 256 or 512 bytes depending on the requirements of the operating system This does not cause a conflict since the drive simply stores 1 2 or 4 host defined sectors for each disk drive block Read and write commands of less than 512 bytes are transparent to the host system due to the intelligent controller s ability to handle data blocking internally CORVUS DEALER SERVICE Drive Description 4 5 Disk Sealed Mechanism The Corvus mass storage disk mechanism uses acombination of both new Winchester technology and traditional disk design The 5 25 inch platters revolve on a common spindle driven a brushless dc motor at 3600 RPM Motor speed is monitored by the Motor Control PCA located uppermost beneath the drive mechanism and is independent of line frequency The index pulse is generated by the magnetic index detector mounted to the underside of the drive base near the spindle The Solenoid Brake is also located adjacent to the motor hub and engages immediately after the drive is powered off Adjustment procedure for the Solenoid Brake and index detector are located in the section titled Adjustments and Maintenance
110. that the drive has the latest release of controller ROMs 3 Be sure to disconnect the ac power cord before replacing any modules 4 Use only known good components when substituting 5 Retest the system after each component has been substituted 8 5 1 On Site Checks There are several quick checks that can be taken that do not require disassembly of the drive 1 Be sure the ac power cable is plugged in and the power switch is turned on 2 Examine the front bezel switches to verify their proper settings 3 On the rear bezel check that the four Mirror DIP switches are set correctly to reflect the internal Mirror configuration 4 Check that the CORCOM unit located on the rear bezel has the correct line voltage and fuse selected 5 Verify that the interface cable is not damaged and has been properly connected at both ends 6 Check to see that the Interface PCA is in the correct bus slot where applicable of the host computer 7 Check that the drive s Controller Firmware is intact section 8 5 3 2 8 5 2 Isolate the Problem Malfunctions in the Corvus disk system may be divided into three catagories 1 Magnetic or software Controller Firmware integrity data integrity format integrity boot image integrity 2 Physical media damage imperfections in media surface 3 Electronic host computer function Corvus drive sealed mechanism and associated Read Write PXCA and Logic PCA Z 80 controller or power supply 4 Environmental
111. the brackets to the drive mechanism and remove the brackets 5 3 5 Read Write PCA 1 Remove the drive mechanism as outlined above 2 Remove the mounting brackets 3 Place the drive mechanism on its top exposing the Read Write PCA 4 Disconnect the read write head select mylar flatcable from the Read Write PCA to the drive mechanism see figure 11 5 Remove the three standoff securing the Read Write PCA to the drive mechanism NOTE The central standoff securing the Read Write PCA provides an electrical ground and must be metal Gently lift the Read Write PCA up disconnecting Motor Control PCA connector 24 refer to figure 11 NI Once the Read Write is free of the Motor Control connector swing the up to expose the stepper motor connector 8 Noting the stepper motor cable orientation yellow wire towards outside disconnect it 5 3 6 Motor Control PCA l1 Noting its position and orientation unplug the brake mechanism connector J 21 from the Motor Control PCA 2 Noting its position and orientation unplug the spindle motor connector J 22 from the Motor Control 3 Noting its position and orientation unplug the index sensor connector J 25 from the Motor Control PCA 4 Noting its position and orientation unplug the track zero switch sensor connector J 23 from the Motor Control PCA This connector must be rotated 90 degrees from vertical before being re connected 5 Rem
112. the disk mechanism and the drive Backplane dc power cables attach to solder terminals on the power supply PCB The H Series drives use power cables which connect the single power supply to the Read Write PCA on the underside of the disk mechanism and to the Backplane PCA 4 4 General Description The recording media of the Corvus 5 25 inch Winchester disk drives consists of an nickel oxide coating on aluminum disks called platters There is one 5 25 inch platter in the Model 6 H Series drive two platters in the Model 11 drive and three in the Model 20 All platter surfaces are utilized for data storage One head rides above each surface on an 18 microinch air bearing air cushion Data is stored magnetically on circular tracks which are configured as concentric circles on each platter Each track is further divided radially into 20 sectors each sector containing one 512 byte block available for user data The term track refers to a single head surface of a cylinder each cylinder consisting of all tracks in common vertical alignment on all surfaces There are 306 cylinders on the H Series drives with cylinder zero located furthest from the platter center a ye m gt TRACK lt PLATTER I CYLINDER lor m Figure 6 Data Configuration A block is the smallest addressable unit within the drive Internally each block consi
113. the host system indicating the result of the disk write 4 9 3 Backplane PCA The Backplane is responsible for transfering power and signals between the Controller PCA Mirror PCA Paddleboard and the Host Interface PCA via the rear bezel 34 pin connector The upper slot of the Backplane is reserved for the Controller PCA and the lower slot is reserved for the Mirror PCA These two PCA positions may not be interchanged This two piece printed circuit assembly accepts flatcables from the front bezel Paddleboard PCA as well as from the Host Computer System A single dc power cable supplies voltage to the Backplane PCA via a four pin connector The Backplane PCA for the H Series drives is unique to these products and is not interchangeable with other Corvus drive products The Backplane PCA for the Model 6 Model 11and Model 20 is interchangeable only between these three drives 4 9 4 Paddleboard PCA The Paddleboard PCA located on the front bezel of the drive enclosure contains switches and LEDs The function of these controls are detailed in chapter 2 All Paddleboard PCA revisions are compatible with all drive revisions and are interchangeable 4 9 5 Interface PCA The Corvus disk system will interface to many different microcomputer systems and may be purchased with any of several interface cards available The typical interface card contains address decoding bidirectional data buffering and handshaking circuitry Some interfac
114. timing tab aligned with the index sensor the clearance should be 0 015 0 0037 7 Reinstall Read Write CORVUS DEALER SERVICE Adjustments INDEX TIMING TAB INDEX SENSOR CABLE MOUNTING SCREW 2 RETAINING CLIP 2 Figure 15 Index Sensor Adjustment 29 CORVUS DEALER SERVICE CHAPTER 7 DEALER SERVICE DIAGNOSTICS CORVUS DEALER SERVICE Diagnostics CHAPTER 7 DEALER SERVICE DIAGNOSTICS 71 Scope of Chapter The Dealer Service Diagnostic Utilities are supplied to aid the technician in tracing faults in the Corvus disk drive system and speed the correction of these faults The Drive Diagnostic Controller Diagnostic and Track Diagnostic utilities are covered in this chapter The Mirror and OMNINET Diagnostics are covered in the service manuals for those products 72 Introduction 1 Each Authorized Corvus Dealer Service Center will be supplied with Dealer Service Utilities These utilities will help the technician exercise and diagnose the Corvus disk and network systems The Dealer Service Utilities diskette is comprised of standard Drive Diagnostic for the all Corvus disk drives including the H Series drives Controller Diagnostic which will exercise and diagnose the drive utilizing the drive Z 80 processor and a rigorous Burn In program which exercises and tests the drive system infinitely i e overnight Also included is a single track read write diagnostic for determining t
115. tion of the Rev A 8 inch 11MB disk drive Rev A drives may be daisy chained only to other Rev A drives All must use Controller Firmware version CF18 3 or later DEC is a registered trademark of Digital Equipment Corporation LSI 11 is a registered trademark of Digital Equipment Corporation ne a O Installation CORVUS DEALER SERVICE Changing the unit select switches positions 1 and 4 on the drive Z 80 Controller PCA for each add on drive is required when daisychaining drives New drives are shipped with the switches configured as drive 1 Additional drives should be set according to their position in the daisy chain 2 3 or 4 Refer to the Corvus Disk System Installation Guide for the appropriate computer system For complete installation and initialization procedures refer to the appropriate Corvus Disk System Installation Guide and Disk System User Guide DRIVE ADDRESS 1 DRIVE ADDRESS 2 DRIVE ADDRESS 3 DRIVE ADDRESS 4 i Oi im Ov BE Oo olo BE Q o i O Ne Qjo 20 Figure 4 Controller Address Switches CORVUS DEALER SERVICE CHAPTER 3 OPERATION CORVUS DEALER SERVICE Operation CHAPTER 3 OPERATION 31 Scope of Chapter This chapter describes operator controls and their use as applies to troubleshooting and repair of the drive Front bezel control switches and Light Emitting Diodes ar
116. ttached This open pin will be at the right end of the connector Read Write PCA Stepper motor connector yellow wire nearest the case 59 sa 0 coe _______ DATE_ APPROVED 205 REL FOR PROD 1 STRIPE 4 SEE SEE DETAIL A gt CIRC 2201 6uB 2202 Em 6NB M 9155 09 6 99159 9156 2088 09154 ogren DETAIL A STRIPE je e e UNLESS OTHERWISE SPECIFIED on z PA 1o c 22 FINAL ASSY H DRIVE Gran PO Ken rn APPLICATION 60 6MB H DRIVE BASE 8 al 5 1 M 81655 9 EH y 12 REVISIONS pejper SE EL FOR FECL zola HARDWARE CHANGE 221 New COVER eer UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANC the CORVUS SYSTEMS 2029 San 95131 CORVUS 6 FOAM TOP COVER ANGLES DECIMALS Lm Zee DRAWING 8010 0805 6 62 3 REVISIONS DESCRIPTION JAPPROVEG mE 1 B REMOVE NOTCHES FT lt 380 C DIP SW 14 82 5 S 90 p 68D CHS 11 53 2 KOD TEM C 82 TE Sa 1
117. ub 3 wire Motor Brake Assembly 0 007 0 003 2 wire Motor Brake Assembly 0 012 0 003 5 While holding the brake plunger fully retracted move brake assembly against thickness gauge and motor hub and tighten brake mounting screws Do not overtighten these screws 6 Recheck the adjustment of the brake mechanism With the brake plunger fully retracted the hub to plunger clearance should be as described above 7 Reinstall Read Write PCA 26 CORVUS DEALER SERVICE Adjustments LATERAL LOCATION BOSSES MOUNTING SCREW xy 015 GAUGE 2 ASSEMBLY CABLE REGISTER AGAINST LATERAL LOCATION BOSSES HOLD PLUNGER FULLY RETRACTED Figure 14 Brake Mechanism Adjustment 27 Adjustments CORVUS DEALER SERVICE 6 5 Index Sensor Adjustment CAUTION Altering of the Index Sensor adjustment may cause loss of data on the drive mechanism This adjustment should be attempted only if a backup of the drive data exists Remove the drive mechanism from the drive cabinet and remove Read Write PCA as described in Chapter 5 Loosen the two index sensor assembly screws Rotate motor until the the silver colored timing tab lines up with the index sensor Place a 0 015 thickness gauge between the sensor and the index tab on the motor Move the index sensor against thickness gauge and tighten mounting screws E ES Recheck the adjustment of the index sensor With the index
118. upply lini di bera e d iei le AU LOK NE i i d eue 47 8 5 4 3 CRC Test ev bu os RUN T E ice d pat acd ve s e 47 8 5 4 4 Controller Communication cies doe la ad 48 8 5 4 5 ee 48 8 5 4 6 Controller Firmware oce cas ee pits wea ag nat Vae Vea 48 iii CORVUS DEALER SERVICE 8 5 4 6 Boot ROM A a do RE eR DEAL Reds 48 8 5 4 7 Interface Components san ea d quen it tie Que 48 8 5 4 8 Drive Initialization us abo Bd WAR 48 8 6 FinatAdiusbmienis and 8 Coca AA p E s ot 49 8 6 1 CORO Tita E AA de A tadas 49 8 6 2 Install Test Mirror aa evt ir un ARA AA A aom qa 49 8 6 3 ERG P LP s Mobs 49 8 6 4 Power Supply us beta eiae AO E 49 8 6 5 rca n aa e RT Rat p Oa NEE IR SALA 49 8 7 Trouble Shooting nee 50 8 8 Common Symptoms and Recommended Solutions 51 Appendix A Glossary AR AS RI 56 Appendix B El Senies Parte List sata Be e ya Se e cane 58 Appendix C Internal is EA pn A Rd do ud 59 CORVUS DEALER SERVICE LIST OF FIGURES AND TABLES CORVUS DEALER SERVICE LIST OF FIGURES AND TABLES Illustrations Figure 1 A
119. user at his own expense will be required to take whatever measures may be required to correct the interference CORVUS DEALER SERVICE CORVUS SYSTEMS H SERIES 5 25 INCH WINCHESTER DISK DRIVE SERVICE MANUAL COVERING MODEL 6 MODEL 11 MODEL 20 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 PART NO 7100 04704 PUBLICATION NO 10 3 01 1 PUBLICATION DATE APRIL 1 1983 O ZO EE W CORVUS DEALER SERVICE TABLE OF CONTENTS CORVUS DEALER SERVICE TABLE OF CONTENTS List of Figures and Tables N ee ee List of Assembly and Schematic DrawIngsaas ss Were esas Specifications vii CHAPTER 1 GENERAL DESCRIPTION 1 1 Scope of Chapter re GN year date eee 1 1 2 Introduction us cid a a oe P Redner Mes 1 1 3 Purpose or Equipment c seva sas I Ee eh d I 14 Model Identifications
120. ve a command from the host processor The BUSY LED is active when the drive is currently executing acommand received from the host processor The FAULT LED is active when command execution has been interrupted due to the occurence of an error The FAULT LED is an indicator of drive malfunction or operational error although some software may cause this LED to light during normal operation FAULT LED function is accompanied by an error code displayed on the computer screen 3 3 2 Front Bezel Switches The function switches are located below the LEDs on the front bezel These are from left to right SI MUX FORMAT RESET During normal operation in single user system without an LSI 11 computer all switches should be set to the left switches except for the RESET switch are polled by the controller routines to determine system configuration Only the RESET switch directly affects the hardware Located furthest to the left the LSI switch is a two position switch the OFF left position is the normal position the ON right position is for use with a DEC System LSI 11 At power on time the controller polls this switch to determine if a DEC LSI 11 computer is attached and loads the DEC RLO1 and RLO2 disk drive emulation routines from the Controller Firmware area into controller RAM The next switch the MUX switch is also a two position switch the OFF left position is the single user position the ON right position
121. ware See 12 and 13 above Set switches correctly Replace Contoller PCA Replace drive mechanism Replace Controller ROM Replace 4118 RAM on Controller PCA Replace Controller PCA Check and adjust Adjust or replace supply as necessary Replace Controller ROM Replace Controller PCA SYMPTOM All LEDs stay 15 Head oscillates after drive is turned on A BUSY LED lights and remains on CORVUS DEALER SERVICE CAUSES Paddleboard cable connected wrong Defective paddleboard Defective paddleboard cable Defective drive sealed mechanism Defective backplane Power supply voltages incorrect Defective Controller PCA Defective drive sealed mechanism Controller Firmware corrupted Format corrupted Power supply voltages incorrect Power supply defective Controller PCA defective Drive sealed mechanism defective 35 RECOMMENDED REPAIR Check paddleboard cable connections Replace paddleboard Replace cable Replace drive mechanism Replace backplane Adjust or replace supply as necessary Replace Controller PCA Replace drive mechanism Update firmware Reformat and update firmware Adjust power supply Replace power supply Replace Controller PCA Replace drive mechanism CORVUS DEALER SERVICE APPENDIX A GLOSSARY CORVUS DEALER SERVICE GLOSSARY BACKPLANE OR MOTHERBOARD two slot printed circuit board which accepts the Mirror PCA when installed and Controller PCA
122. ylinders on all H series drives The Model 6 has two tracks per cylinder the Model 11 has four and the Model 20 has 6 DISK MECHANISM OR SEALED MECHANISM the IMI disk drive assembly consisting of platters drive motor head assembly and stepper motor mechanism all in a sealed cast aluminum body The above components inside the sealed mechanism are not field servicable and the unit is not to be opened by any other than a Corvus factory facility otherwise the warranty will be void DMA OR DIRECT MEMORY ACCESS method by which data is transferred at a very high rate independent of the processor The processor is put into a wait state where it does no data manipulation The DMA circuitry takes care of all details using the Z 80 address bus for destination or origin address for data transfer DVM Digital Volt Meter A meter used for measuring voltages which shows output by means of a display consisting of changing digits proportional to the voltage measured FIRMWARE or CONTROLLLER FIRMWARE Z 80 code contained in the first two cylinders of the drive consisting of routines for the Spare Track Table Virtual Drive Offset table Pipes and Semaphore Status Flags The appropriate routines are downloaded from the Firmware are into the on board RAM for execution by the Z 80 Controller at power on time FRONT BEZEL the front panel of the cabinet containing the Paddleboard PCA and logo GROUNDSTRAP located at the lower end of the spind

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