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Страница 1: ...THE CORVUS SERVICE MANuAL 11and20 Megabyte Drive CORVUS SYSTEMs ...

Страница 2: ...ed This document may not in whole or in part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without prior consent in writing from Corvus Systems Inc Copyright 1982 by Corvus Systems Inc All rights reserved Mirror patent pending The Corvus Concept Transporter Corvus OMNINET Corvus Logicalc Time Travel Editing EdWord Constellation Corvus Corv...

Страница 3: ...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 ...

Страница 4: ...CORVUS DEALER SERVICE TABLE OF CONTENTS ...

Страница 5: ...sy Chaining of Disk Drives 6 CHAPTER 3 OPERATION 3 1 Scope of Chapter 8 3 2 Introduction 8 3 3 Controls 8 3 3 1 Front Bezel LEOs 8 3 3 2 Front Bezel Switches 9 3 4 Power On Sequence 10 3 5 Environmental Requirements 10 3 5 1 Static Electricity 10 3 5 2 Line Noise 10 3 5 3 Temperature 10 3 6 Periodic Maintenance 10 3 6 1 Regular Checks 11 3 6 2 Groundstrap 11 CHAPTER 4 DRIVE DESCRIPTION 4 1 Scope o...

Страница 6: ...ler During Read and Write Commands 27 5 6 Backplane Motherboard PCA 28 5 7 Preamp PCA 28 5 8 Paddleboard PCA 30 5 9 Interface PCA 30 CHAPTER 6 DISASSEMBLY 6 1 Scope of Chapter 31 6 2 Introduction 31 6 2 1 Tools Required 31 6 3 Metal Cabinet 31 6 3 1 Top Cover 31 6 3 2 Rear Bezel 31 6 3 3 Backplane Cover 33 6 3 4 Cabling 33 6 3 5 Drive Mechanism 33 6 3 6 Power Supply 33 6 3 7 Front Bezel 33 6 4 Sta...

Страница 7: ... 44 8 3 6 1 MUX 44 8 3 6 2 DRIVE 45 8 3 7 SET 45 8 3 8 QUIT 45 8 4 Controller Diagnostic 45 8 4 1 General Description 46 8 4 2 Controller Diagnostic Commands 46 8 4 2 1 A Abort Diagnostic 46 8 4 2 2 B Macro Menu 46 8 4 2 3 C Change Slot Number 47 8 4 2 4 D Download Diagnostic 47 8 4 2 5 I Analyze Servo 47 8 4 2 6 J Single Do Seek 47 8 4 2 7 L Full Cylinder Loopseek 48 8 4 2 8 P Print Quiet Summary...

Страница 8: ... 3 6 Drive Sealed Mechanism 60 9 5 4 Link Inoperative 60 9 5 4 1 Check Link Action 61 9 5 4 2 Power Supply 61 9 5 4 3 CRC Test 61 9 5 4 4 Servo Test 62 9 5 4 5 Controller Firmware 62 9 5 4 6 Boot ROM 62 9 5 4 7 Interface Components 62 9 5 4 8 Drive Initialization 62 9 6 Final Adjustments and Tests 62 9 6 1 Proper Headlock Operation 62 9 6 2 CRC Test 63 9 6 3 Servo Check and Adjustment 63 9 6 4 Ins...

Страница 9: ...CORVUS DEALER SERVICE LIST OF ILLUSTRATIONS AND TABLES ...

Страница 10: ...on 20 5 1 Servo Track Relationship 22 5 2 Tri Bit Signal 22 5 3 Corvus RevB Block Diagram 23 5 4 Read Write PCA Jumper Location 25 5 5 NRZ and MFM Data Formats 26 5 6 RevA Cabling 29 5 7 RevB Cabling 29 6 1 Access Door Metal Package 32 7 1 dc Power Cable Connection 35 7 2 Drive Configuration for Servicing 38 7 3 PES Signals Improperly and Properly Adjusted 39 7 4 Mechanism Adjustment 42 9 1 Locati...

Страница 11: ...CORVUS DEALER SERVICE SPECIFICATIONS ...

Страница 12: ...et Height In Cm Length In Cm Width In Cm Weight Lbs Kgs Environmental Requirements Operating Temperature F C Non Operating Temperature F C Operating Relative Humidity Non Operating Relative Humidity Operating Altitude ft Operating Vibration G Non Operating Vibration G Non Operating Shock G CORVUS DEALER SERVICE SPECIFICATIONS vi 11MB 20MB 2 3 3 5 1 1 1 1 3 5 1 1 358 388 20 20 300 300 512 512 10 24...

Страница 13: ...Line fuse Amperes c__ 7 7 j L L V I W L V Y for 220V 240V Reliability Mean Time Between Failure tv1TBF Maximum Repair Time CORVUS DEALER SERVICE vii 100 120 48Hz 62Hz Single Phase 220 240 48Hz 62Hz Single Phase 250 1 V 2 0 10 000 operational hrs vv ithin above requirements Not more than 0 5 hrs ...

Страница 14: ...CORVUS DEALER SERVICE CHAPTER 1 GENERAL DESCRIPTION ...

Страница 15: ...o the Corvus Systems Installation Guide and Corvus Systems User Guide for information on these subjects 1 3 Model Identification The Corvus eight inch disk drives are very similar in appearance Before any service procedures are attempted the drive must be identified as to the model and serial number Locate the serial number tag on the rear bezel The following is a sample serial number to be found ...

Страница 16: ... cabinet Only the Mirror PCA may be removed through this door The RevA sealed mechanism was manufactured in II megabyte capacities only The RevB is manufactured in both 11 and 20 megabyte capacities There are no fundamental differences in the sealed mechanisms of the RevA and RevB 11MB units This is not to say that all 11MB units are identical Each unit should be inspected to determine its particu...

Страница 17: ...CORVUS DEALER SERVICE CHAPTER 2 INSTALLATION ...

Страница 18: ...pping and operation When a drive is received check that all chips in the Z 80 Controller PCA are seated well in their sockets Chips coming loose during shipping account for a large number of failures upon receipt 1 Locate the access door in the center of the drive basepan 2 Remove the two allen screws and open the door The Controller Logic PCA is located directly behind the access door facing outw...

Страница 19: ... CRC Format Check should be done for the drive as well as verifying the Drive Parameters specifically the Spare Track Table and the Virtual Drive Offset Table A new drive may be shipped with up to four tracks spared and considered operational When the Drive Parameters and the VDO Table is first checked these parameters should be noted recorded on a label and attached to the drive In the event that...

Страница 20: ... has been selected Referring to figure 2 2 proceed with the following instructions Figure 2 2 CORCOM Unit 1 Remove power cord from CORCOM unit at rear of drive 2 Slide plastic door to the left uncovering fuse 3 Remove fuse 4 Using a pair of needle nose pliers remove voltage selection PCB from just below fuse holder 5 Position voltage selection PCB so that proper voltage is visible when PCB is inse...

Страница 21: ...ath the front bezel and turn it on The drive will begin to spin up to speed and all Light Emitting Diodes or LEOs front bezel indicator lights will come on steady On drives with late model Controller ROMs the BUSY LED will begin to flash After approximately thirty seconds the FAULT LED will go out and the heads will rezero LED activity will briefly alternate between READY and BUS after which the d...

Страница 22: ...ive 1 Additional drives should be set accordingly taking into account that a 20MB drive is two logical drives Not all systems refer to 20MB drives as two logical drives CP M does not Refer to the Corvus User Guide for the appropriate computer system Table 1 1 Unit Address Options DRIVE SW1 SW2 SW3 ADDRESS NOT USED 0 ON ON OFF 1 ON OFF ON 2 ON OFF OFF 3 OFF ON ON 4 OFF ON OFF 5 OFF OFF ON 6 OFF OFF...

Страница 23: ...CORVUS DEALER SERVICE CHAPTER 3 OPERATION ...

Страница 24: ...uration in order for the drive to function properly Indicator LEOs 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 LEOs monitor the current state of the drive Controller Four function switches are located under the LEOs Rear bezel components consist o...

Страница 25: ...ectly affects the hardware I I I LSI 11 MUX FORMAT RESET Normal J rmaSJ ormr LSl 11 lsingle FormatJ Reset Multiplexer Figure 3 2 Function Switches 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 The heads re zero and disk Controller Firmware is loaded in from the disk into the Con...

Страница 26: ... 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 a 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...

Страница 27: ... it This resulted in some drives being manufactured with groundstraps and some without Drives with groundstraps should retain them while those without need not have them added The Corvus Disk System is designed to be used in an office environment and hence noise levels have been kept to a minimum While every effort has been made to quiet the operation of the disk some mechanical noise is inherent ...

Страница 28: ...CORVUS DEALER SERVICE CHAPTER 4 DRIVE DESCRIPTION ...

Страница 29: ... separate stand alone unit The CP129 is contained in a black rectangular metal case The power switch is located on the end of the supply and a dc power cable connects to the disk mechanism All voltages on the CP129 are adjustable 4 3 3 CP140 The CP140 is an open chassis power supply used in early models of the enclosed Corvus disk cabinet Three types of the CP140 exist the CP14D I0358 the CP145 M1...

Страница 30: ...CORVUS DEALER SERVICE Figure 4 1 Stand Alone Drive with CSIOO Power Supply 13 ...

Страница 31: ...CORVUS DEALER SERVICE Figure 4 2 Stand Alone Drive with CP129 Power Supply 14 ...

Страница 32: ...CORVUS DEALER SERVICE Figure 4 3 White Cabinet with CP140 Power Supply 15 ...

Страница 33: ...sks referred to as platters The II megabyte drive has two eight inch circular platters while the 20 megabyte has three There are two heads for each platter one on each side of each platter suspended aerodynamically above each surface TRACK I I _ I I I I I I CYLINDER I _ Figure 4 4 Data Configuration Data is stored magnetically on circular tracks which are configured as concentric circles on each p...

Страница 34: ...LLER LOGIC PCB FUTURE EXPANSION REV A READ WRITE PCB SERVO PCB MICROLOGIC PCB DISK CONTROLLER PCB HEADSTACK MICROCHIP 1 E i C e 7 i i e Z 5 e C I 5 R e i j7 2i s eI 5 i I 4C CARD CAGE READ WRITE HEADS SPINDLE GROUNDING BRUSH BRUSHLESS DC DRIVE MOTOR MOTOR SPEED ilPR m r w W F 3 CONTROL PCB DISK DRIVE SEALED MECHANISM ...

Страница 35: ...ely 30 seconds after power off 4 5 2 Controller Firmware Corvus reserves the first two cylinders of the drive for system information This is referred to as Controller Firmware and is not accessable to the host operating system This Firmware contains programming and system information needed by the Z 80 Intelligent Controller and is loaded into the disk drive RAM when the drive is powered on or the...

Страница 36: ...of headlock device should be determined and if the manual type unlocked Before shipping any drive verify proper headlock function by tipping the drive while observing the heads If the headlock is functioning properly the heads should not move When the drive is received unlock the heads manual headlock drives and verify that the heads are free by powering on and tipping the drive The manual lock dr...

Страница 37: ...oot routine This consists of first re zeroing the heads bringing them over the first cylinder of the disk surfaces The FORMAT switch or jumper in earlier drive configurations is then tested If the switch is on 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 ...

Страница 38: ...CORVUS DEALER SERVICE CHAPTER 5 THEORY OF OPERATION ...

Страница 39: ...ppendices for details The Servo Electronics has two modes seek mode in which a command is received from the Intelligent Controller and the servo seeks a specific cylinder address and position mode in which the servo position circuitry independent of the Controller applies correction voltage to the servo mechanism whenever the heads are detected to have drifted off cylinder These two states can be ...

Страница 40: ...CORVUS DEALER SERVICE tr SERVO t SERVO TRACK 1 TRACK 2 READIWRITE TRACK SERVO TRACK 1 SERVO TRACK 2 Figure 5 1 Servo Track Relationship Figure 5 2 Tri Bit Signal 22 ...

Страница 41: ...PLIFIER t MI a r L SERIAL TO PARALLEL CONVERTER CRC GENERATOR 1 ICHECKER RAM t DMA CHANNEL PARALLEL TO SERIAL CONVERTER CONTROLLER LOGIC BOARD VOICE COIL DRIVE MOTOR PREAMP ELECTRONICS I A l READ WRITE SERVO HEADS MFM TO NRZ DECODER FILTER AMPLIFIER NRZ TO MFM ENCODER WRITE DRIVERS DRIVE MECHANISM READ WRITE BOARD Figure 5 3 Corvus Rev B Block Diagram 23 ...

Страница 42: ... This word is converted to an analog voltage by a digital to analog converter which in turn regulates drive current to the servo voice coil mechanism full current is pplied to the servo for the majority of the seek tapering as the heads reach the destination cylinder The PES is monitored by a zero crossing circuit on the Servo PCA which sends an interrupt to the Z 80 Controller each time the heads...

Страница 43: ...e one absence of flux change zero makes it possible to record this digital information in a high density see figure 5 5 Through the use of a data separator the clock signal is separated from the serial data stream The clock signal is distributed to the Controller for clocking of all drive functions during the read command 5 4 2 Write Operation During a write command the read write electronics rece...

Страница 44: ...e Controller Logic PCA consists of the 2 80 CPU and support logic as well as Controller ROMs containing procedural 2 80 code for the Intelligent Controller and on board RAM used for buffering data to and from the disk and utility code loaded from the Controller Firmware area of the disk Also four PIO ICs are used to buffer signals to and from the Corvus Mirror Constellation Multiplexer Read Write ...

Страница 45: ...der information is read from the next sector that passes under the read heads Ifthe sector address is incorrect the heads will be re zeroed and the seek will be attempted again 5 5 3 Controller During Read and Write Commands The write command begins when the write command is received along with the sector address The 2 80 Controller determines whether the write command is for 128 256 or 512 bytes ...

Страница 46: ...o mil connector and a 200 mil connector The 100 mil connector has two closely spaced rows of evenly paried holes The PROCESSOR port on the rear of the white cabinet accepts a 10o mil connector The 200 mil connector has two widely spaced rows of holes These two rows of holes are not evenly paired but offset by one hole and each time it is connected must be inspected carefully to avoid misconnection...

Страница 47: ...CORVUS DEALER SERVICE Figure 5 6 Rev A Cabling Figure 5 7 Rev B Cabling 29 ...

Страница 48: ...ss decoding bidirectional data buffering and handshaking circuitry Some interface cards also have ROMs with 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 bu...

Страница 49: ...CORVUS DEALER SERVICE CHAPTER 6 DISASSEMBLY ...

Страница 50: ...wer supply sharing a white cabinet Disassembly procedures for these configurations are covered in section 6 3 Metal Package WARNING Before disassembling any disk equipment be sure power Is disconnected CAUTION Do not under any circumstances operate the drive without first insuring that PCA spacers have been installed between electronic circuit cards Failure to do this will allow the PCAs to contac...

Страница 51: ...CORVUS DEALER SERVICE Figure 6 1 Access Door Metal Package 32 ...

Страница 52: ...e four screws securing the supply to the basepan 6 Remove the power supply straight up and out of the basepan 6 3 7 Front bezel 1 Disconnect the flatcable from the Paddleboard PCA on the front bezel 2 Remove sealed mechanism and power supply from the basepan as described above 3 Remove the four slot screws securing the bezel to the vertical support brackets 4 Remove the bezel 6 4 Stand Alone Units...

Страница 53: ...Backplane and all electronics PCAs may now be lifted straight away from the drive mechanism CAUTION Do not under any circumstances operate the drive without first ensuring that PCA spacers have been installed between electronics circuit cards Failure to do this will allow the PCAs to contact each other which may cause catastrophic damage if the drive is powered on 6 5 2 PCA Replacement 1 Remove ca...

Страница 54: ...CORVUS DEALER SERVICE CHAPTER 7 ADJUSTMENTS AND MAINTENANCE ...

Страница 55: ...allation is visited for system checkout WARNING Extreme caution should be exercised when adjusting the power supply High voltages present a potential hazard 7 3 1 CP140 and CP411 7 3 1 1 Voltage Check 1 Remove cover to the enclosure as outlined in section 6 3 1 2 Locate voltage test points along the top side of the power supply These are labeled 5 1 COM 5 1 12 1 COM 12 1 COM 24V 3 Turn on the ac p...

Страница 56: ...h 9 Recheck and if necessary readjust the voltages 7 3 2 CS100 Voltage Check and Adjustment WARNING Underno condition Is the CS100 to bepowered on while disconnected from the disk drive unit The CS100powersupply Is a switching powersupply and mustbe underload to be adjustedproperly Attempting to adjust the CS100 while disconnected from the drive may resultIn severe damage to the supply and possibl...

Страница 57: ...r supply and turn on the ac power switch 5 Monitoring the dc voltages as outlined above adjust all voltages using the following adjustments CP129 R 4 R 14 R 13 R 17 R 6 If any of the above voltages are not adjustable within tolerance the power supply must be replaced NOTE During adjustment the sV or sV may drop to or near zero This is due to the over voltage protection circuitry being activated To...

Страница 58: ... Service Utilities are detailed elsewhere in this document 7 4 1 Servo Adjustment ASM 310176 and 310221 1 Remove ac power from the drive 2 Remove the drive mechanism from the metai cabinet if mounted in an enclosure 3 Place the drive mechanism on one side 4 Remove the PCA card assembly from the drive mechanism leaving the 30 pin preamp cable and motor wires connected between the drive mechanism an...

Страница 59: ...nostics execute DOWNLOAD DIAGNOSTICS utility D and then ANALYZE SERVO utility I The program will return the average seek time required to execute a full loop seek This should be 7Oms 2 5ms If the returned value is out of tolerance follow the adjustment procedures below 7A Alternately FULL CYLINDER LOOPSEEK utility L may be executed in place of ANALYZE SERVO which executes an infinite full cylinder...

Страница 60: ...in B31 ground to pin A77 A80 select 2V div dc coupled Trigger channel A negative edge dc coupled Timebase IOms div Timing 96ms 2 sms 6 Turn on the host microcomputer then the Corvus drive observing that the heads re zero The drive must come to READY for the diagnostics to communicate with the drive 7 Boot the Corvus Dealer Service diskette select REV A DIAGNOSTICS and execute SERVO ADJUST 8 View t...

Страница 61: ...lowed sufficiently to no longer aerodynamically support the heads above the disk platters The brake mechanism should be adjusted only when it is observed not to function properly Normally the brake should click in and brake the spindle to a stop within 30 seconds after power off If this does not occur the brake should be adjusted following the adjustment procedures below 7 5 1 Brake Adjustment Rem...

Страница 62: ...CORVUS DEALER SERVICE Figure 7 4 Mechanism Adjustment 10 Power off the drive 1 Replace the unit bottom cover 42 ...

Страница 63: ...CORVUS DEALER SERVICE CHAPTERS DEALER SERVICE DIAGNOSTICS ...

Страница 64: ...C value is read with it and tested Bit errors may occur in one of two 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 bytes The Cyclic Redundancy Code Test is a non destructive test which reads each block of data and checks it against its CRC value If for any reason the CRC value do...

Страница 65: ...e time need formatting This diagnostic level or bottom level format writes the rudimentary magnetic pattern to the tracks required before data may be retained properly First turn the FORMAT to the ON right position then execute the FORMAT program Some versions of this utility request a password which is HAL When the Format has completed the program will display FORMAT COMPLETE NOW UPDATING FIRMWAR...

Страница 66: ... number containing the faulty sector must first be calculated The formula for this is T CxN H where T is the track number to be calculated C and H are the cylinder and head numbers respectively returned by the CRC program N is the number of data surfaces of the drive These are as follows 11MB 3 data surfaces 20MB 5 data surfaces The resulting track number should be spared The Sector Interleaving S...

Страница 67: ... consists of three blocks of code which are loaded to different locations in the Controller memory 8 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 space is specified Whenever the entry of a Controller Diagnostic command results in the response x ...

Страница 68: ... 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 return 8 4 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 2 80 code into the memory...

Страница 69: ...is 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 8 4 2 9 Q SECTOR QUIET PROGRAM CAUTION This command will DESTROY data on the disk including Controller Firmware Thi...

Страница 70: ...until a new command is issued 8 4 2 13 Y REZERO HEADS This command instructs the Controller to position the heads on cylinder zero The format for this command is Y retum 8 4 3 Error Codes The error codes returned by the command documented in 8 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 P...

Страница 71: ...aced to Current time refers to A the pass number and B the current chunk being tested Total errors refers to the total hard and soft errors encountered by this program on this drive since the beginning of this program Hard 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 ha...

Страница 72: ...NTINUE L IST ERRORS R ESTART Q UIT 8 7 1 C ONTINUE Entering a C will cause the program to continue on as it was before interruption 8 7 2 L IST Entering a L will display an error summary for example ERROR SUMMARY PASS NUMBER 0 2160 TOTAL READS 1080 TOTAL WRITES oTOTAL HARD ERRORS oTRACKS WITH HARD ERRORS oTOTAL SOFT ERRORS oTRACKS WITH SOFT ERRORS The pass number refers to the total number of loop...

Страница 73: ...ng the PLO on the Servo PCA Execute this utility and follow the instructions in chapter 7 for adjustment of the Servo PLO The SERVO option executes the proper full loop seek required for checking the timing of the Servo electronics Execute this utility and follow the instructions in chapter 7 for adjustment of the Servo PCA Selecting the QUIT option returns the user to the RevA Drive Diagnostic me...

Страница 74: ...CORVUS DEALER SERVICE CHAPTER 9 FAULT ISOLATION PROCEDURES ...

Страница 75: ...sponsibility of the operating system to interpret the error code and take appropriate action Errors returned by the Controller are listed below Errors less than or equal to 127hexidecimal are non fatal Those errors greater than or equal to 128 are fatal errors The format of the error code is shown below bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit a The eight bit error code is broken into four se...

Страница 76: ...224 error in preparing R W 129 161 193 225 seek timeout 130 162 194 226 seek fault 131 163 195 227 seek error 132 164 196 228 header CRC error 133 165 197 229 rezero timeout 134 166 198 230 rezero fault 135 167 199 231 drive not online 136 168 200 232 write fault 137 169 201 233 format protected 138 170 202 234 read fault 139 171 203 235 data CRC error 140 172 204 236 sector locate error 141 173 2...

Страница 77: ...5 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 80 AD CO ED write protected 8E AE CE EE illegal sector address 8F AF CF EF illegal command op code 90 BO Do Fo spare track table overflow 91 Bl 01 Fl overlay failure FE verify error burn in test...

Страница 78: ...3 61 29 seek error 92 60 28 header CRC error 91 59 27 rezero timeout 90 58 26 rezero fault 89 57 25 drive not online 88 56 24 write fault 87 55 23 format protected 86 54 22 read fault 85 53 21 data CRC error 84 52 20 sector locate error 83 51 19 write protected 82 50 18 illegal sector address 81 49 17 illegal command op code 80 48 16 spare track table overflow 79 47 15 overlay failure 2 verify err...

Страница 79: ...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 CORCOM unit has the correct line voltage and fuse selected 4 Verify that the interface cable is not damaged and has been properly connected at both ends 5 Check to see that the interface is in the correct bus slot w...

Страница 80: ...rought within tolerance the power supply must be replaced Using a DVM follow the voltage check and adjustment procedures outlined in section 7 3 of this manual The ten pin dc power connector and the two pin motor power connector located at the upper right corner of the drive Backplane should be checked for a clean and tight fit Measuring the voltages at the drive Backplane power pins will verify t...

Страница 81: ...ay lose contact and result in a malfunctioning drive Reseating all connectors and using an eraser on all gold edge connector pins will help eliminate any oxidation that may have built up causing improper contact Also reseating socketed ICs on the Controller Logic PCA will ensure good pin connections Simply disassembling and reassembling the drive may eliminate symptoms that seem to indicate faulty...

Страница 82: ...sm Check the brake for proper function and adjust if necessary section 7 5 Servo tracks will weaken as the drive ages and can be seen as noise on the PES Connect an oscilloscope to the drive as outlined in the Servo Adjustment section 7 4 and execute the CRC test The PES should be quiet while positioned on a cylinder The more noise seen in the signal the weaker the servo track has become A servo t...

Страница 83: ...Test Execute the CRC test This will 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 If the CRC errors are encountered the complete track must be spared PRM option Drive Diagnostics Corvus User Guide Sometimes the CRC test will not begin READY LED remains lit or will not finish BUSY LED flickers momentari...

Страница 84: ...after each 9 5 4 8 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 co...

Страница 85: ...ine should be a routine function performed each time the drive is serviced refer to section 9 5 3 4 for instructions Whether or not this procedure was previously performed on this drive it should be done now If the voltage of the TTL high signal at R3 is not within tolerance follow the replacement procedures outlined in section 9 5 3 4 9 6 6 CRC Test Executing the CRC test once again verifies that...

Страница 86: ...CORVUS DEALER SERVICE Figure 9 3 Checking Proper Headlock Operation 64 ...

Страница 87: ...VOLTAGES OK ADJUST VOLTAGES NO NO YES DRIVE READY REPLACE INTERFACE CABLE OR PCB NO RUN TEST CRC FINISH YES TEST ADJUST RUN R W YES SERVO EXERCISE OR SERVO ELECTRONICS TEST ERRORS FORMAT DRIVE NO NO RUN UPDATE DOES TEST CONTROLLER FINISH ERRORS EXERCISE OR SERVO FIRMWARE LINK YES NO TEST ERRORS NO CHECK FUNCTION NO PARAMETERS YES YES YES SPARE FLAWED TRACK S RUN CRC TEST UPDATE CONTROLLER FIRMWARE...

Страница 88: ...PCA defective Servo mechanism defective Drive is not Ready Firmware is wrong level for revision of drive CRC error in Controller Firmware area Servo needs adjustment 66 RECOMMENDED REPAIR Check and adjust Check voltage and adjust Check de power connector and motor con nector for continuity and proper connection at backplane Replace power supply Adjust brake mechanism Replace drive sealed mechanism...

Страница 89: ...oller PCA defective Format not intact Controller Logic PCA defective Read Write PCA is defective Drive Sealed Mechanism defective Servo PCA defective Track is already spared Controller ROMs 3 xx and 4 xx on Controller PCA 1 r aerealve Controller Logic PCA defective Drive Sealed Mechanism defective 67 RECOMMENDED REPAIR Replace Servo PCA Replace Controller ROMS Replace Controller PCA Replace Read W...

Страница 90: ...lerance Power Supply defective dc power cable defective Boot ROM where applicable or Interface PCA defective Controller ROMs 3 xx and 4 xx on Controller PCA defective Drive Sealed Mechanism defective 68 RECOMMENDED REPAIR Replace Drive Sealed Mechanism Replace Read Write PCA Check Power Supply voltages Adjust if necessary Adjust Servo electronics Replace Servo PCA Replace Read Write PCA Replace Dr...

Страница 91: ... voltages intermittent Servo needs adjustment Servo PCA defective Controller Firmware corrupted Controller ROMs 3 xx and 4 xx on Controller PCA defective Controller PCA defective Read Write PCA defective Drive Sealed Mechanism defective 69 RECOMMENDED REPAIR Replace software with known good copy and 1 lCCAC U lC Recreate boot image see user guide Execute CRC FORMAT CHECK Spare any tracks returning...

Страница 92: ...oltages intermittent Controller unit address set incorrectly Servo needs adjustment Servo PCA defective Controller Logic PCA defective 70 Replace Boot ROM If problem persists replace Interface PCA Adjust Servo electronics Replace Servo PCA Check voltages adjust if necessary Determine quality of ac power supplied to Corvus and host computer Determine types of electrical devices on same ac circuit L...

Страница 93: ... Ifproblem persists reformat the drive using Diagnostic FORMAT utility Front bezel sYJitches incorrect Power Supply voltages out of tolerance Power Supply defective Servo needs adjustment Servo PCA defective Controller ROMs 3 xx and 4 xx on Controller PCA defective Read Write PCA defective Boot ROM where applicable or Interface PCA defective 71 Verir correct setting of s tches Check voltages adjus...

Страница 94: ...CORVUS DEALER SERVICE APPENDIX A GLOSSARY ...

Страница 95: ...rear bezel uint which accepts the power cord and contains the line filter line voltage PCB and fuse CYLINDER all data tracks in common vertical alignment The la megabyte drive has 358 concentric cylinders the 2a megabyte drive has 388 There are three data tracks per cylinder for the la megabyte drive and 5 for the 2a megabyte DISK CONTROLLER PCA the Revision A circuit board assembly containing the...

Страница 96: ... PREAMP circuit responsible for initial amplification of analog signals In the IMI drive the first circuit downline from the headstack In some drives this is located on the underside of the drive mechanism while later designs moved this to the Read Write PCA REAR BEZEL the rear panel most area of the cabinet containing the flatcable connectors for the interface cable video connectors power cable a...

Страница 97: ...CORVUS DEALER SERVICE APPENDIXB PARTS LIST FOR EIGHT INCH DRIVES ...

Страница 98: ...ATCABLE PADDLEBOARD BACKPLANE FLATCABLE INTERFACE 5 FT HARNESS POWER SWITCH 4 WIRE HARNESS AC CORCOM SWITCH CON P S CON FLATCABLE MIRROR DRIVE FLATCABLE MIRROR PROCESSOR 8 DRIVE BASE COMPLETE FAN F and R BEZELS F BEZEL COMPLETE PADDLEBOARD NAMEPLATE MIRROR PHONO HARNESS MIRROR HALF ONLY R BEZEL COMPLETE FLATCABLES MIRROR HARNESS CORCOM FLATCABLE REMOTE VCR HARNESS MIRROR PHONO 11MB DISK MECHANISM ...

Страница 99: ...CA RevA RevB 11MB 20MB PROM Micrologic RevA PROM Micrologic RevA PROM Micrologic RevA MFR PART NUMBER 811 01427 001 011 1 nt V _ i V 811 01428 001 811 01398 001 811 01368 X01 811 01441 001 811 01393 X01 811 01394 X01 811 01439 001 811 01431 X01 814 00549 002 814 00549 003 814 00549 004 In the future the manufacturer will be silkscreening PCAs with new eleven digit part number Above is the cross re...

Страница 100: ...CORVUS DEALER SERVICE APPENDIXC PCA COMPATIBILITIES ...

Страница 101: ...D LOCK asm 310161 asm 310161 asm 310156 asm 310156 REV A DRIVES MANUAL and AUTO HEAD LOCK MICROLOGIC PeA REVB DRIVES MANUAL and AUTO HEAD LOCK asm 310071 asm 310181 see SERVO PCB COMPATIBILITY above for servo pcb and ROM restrictions none READ WRITE PeA REV A AND REV B DRIVES MAUAL AND AUTO REV A AND REV B DRIVES MANUAL AND AUTO HEAD LOCK HAVING PREAMP PCB asm 310026 HEAD LOCK HAVING PREAMP PCB as...

Страница 102: ...CORVUS DEALER SERVICE APPENDIXD ASSEMBLY AND SCHEMATIC DRAWINGS ...

Страница 103: ...M 310101 3 OF 3 106 Assembly Dwg ASM 310101 107 Schematic Dwg ASM 310221 1 OF 3 108 Schematic Dwg ASM 310221 2 OF 3 109 Schematic Dwg ASM 310221 3 OF 3 110 Assembly Dwg ASM 310221 111 77 Schematic Dwg ASM 310176 1 OF 3 112 Schematic Dwg ASM 310176 2 OF 3 113 Schematic Dwg ASM 310176 3 OF 3 114 Assembly Dwg ASM 310176 115 Schematic Dwg ASM 310006 1 OF 3 116 Schematic Dwg ASM 310006 2 OF 3 117 Schem...

Страница 104: ... III ulld ill Of 1 III My _ _111 ioN _olCOlWW IVIITUIS I IIlAWIl DlIl1 0 DIlAWW8 HUV 8 12 81 18PL UNLESS OTHERWISE SPECIFIED OIMENilOHS RE IN INCHES TOLERANCES ON ANGLES DECIMALS ill m 5EE DETAIL A OJ I APPLICATION NEXT ASSY USiD ON 142PL r _ _ 1 Of JAIL A NCi CALE r _ nillll lti TTT J 1III lfll i II 1 I t r i _ ASSEMBLY OWG METAL CABINET ...

Страница 105: ... B 1 CI l 10 I ASSEMBLY 0 WG DETAIL 7 ...

Страница 106: ...o t Q 2 I ii J KJoLII NI NE c o y _ I SfAlci lat WI R vl ES K IPTION _ 3 2 ASSEMBLY OWG FRONT BEZEL ...

Страница 107: ... l s _ Tlr DOIlII IIO IOOO IOC1 A PAClC O UT 5 ACK EW ASSEMBLY OWG REAR BEZEL i c _r _ _ _ r_ iPtT V r f ____ ____ __ _ _ _ cc L6KA E Z Ii v c r I K 1 I _ l I ...

Страница 108: ...82 CORVUS SYSTEMS INC e UN 9 81 WIRING HARNESS K 20MBCORCOM Assy DRAWING ...

Страница 109: ...F pea NO KEV 1 2 C 4 fj L 14 TE ILES5 THERl S SP CiF iJ SFACf TIE WRAP JENL y IN CABLE oSHOWN aDEN TIE I JP APS R LA IT k A PS 5HO LD 3E P L c TI6HT vIr HA O 1 p l S T hllh7 _ t v I oJ 83 ...

Страница 110: ...BLACK 2X un 1 WHITE 2x 4 SHRI IK IllP IW ArrR0X liL l 1y l CORVUS SYSTEMS INC HARNE SS M IRROH PHONO Assy DRAWING 76030 2Oi 84 ...

Страница 111: ...062 I I o 54 o S3 OD2 52 Cllr SI ODI o RPIO i l iL 51 TES UNLE 3 OTH ERWIS E SPECI FI ED lLJPERMANE _Y MARK OR IDENTIFY REV LEVEL APPROX WHERE S r J 2 SQUARE F INDICATES PIN I OF I C AND R PAK POSITIV E END OF PACITOR CATHODE OF DIODE SEE SEPERA1E LIST OF MATERiALS CORVUS SYSTEMS INC A CCt l ARTV nlAl PA nnT t RnA On pr A ...

Страница 112: ...NC 54 NO RPI 4 5V 1 1 J 5 iIUI o6 9 tUI 8 J 5 Y 32 _1_3 1 2 1 1 IO __ 24 FMT 26 MUX 28 LSI 3 S2 7 N O SI 5V I CORVUS SYSTEMS iNC CALI r J0 l lE APPROVED ay C K D DATE 5 81 t r I ED r PADDLE BOARD SCHEMATIC GI D GRAM DRAWING HUM E R 17 20 77 SCHEMATIC PADDLEBOARD PCA ...

Страница 113: ...ition that It will not be used directly or indirectly In any way detremental to the Interest of CORVUS SYSTEMS UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ON APPLICATION ANGLES DECIMALS DRAWN BY DATE OF DRAWING XX fO J I q 2 j t I L J X_X X_ _ __ I I HH EE C Y E N GIN E I ER t MA ERIALI I J _ _ _ APPROVED J t iASSY 0RAWIN Cl SO2 NEXT ASSY USED ON FINISH _ APPROVED L L t _ SCALE ...

Страница 114: ...RVUS SYSTEMS 2029 OToole AYenue San Jose CA 95131 PADDLEBOARD II DATE OF DRAWING 9 2 81 This document contams proprietary information and IS delivered upon the expressed condition that It will not be used directly or Indirectly m any way detremental to the interest of CORVUS SYSTEMS DRAWN BY HUY UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ON ANGLES DECIMALS XX L l xx x _ L CCfjE...

Страница 115: ...UTOMATIC CURRENT LIMIT FOLDBACK OVER VOLTAGE PROTECTION SET AT 6 2 4VDC ON SV OUTPUT ONLY STABILITY 3 FOR 24HRS AFTER WARM UP INPUT FUSING RECOMMENDED FUSE AT 6A FOR 11SVAC 3A FOR 230VAC TE ERATURE COEFFICIENT 03 Oc MAX COOLING UNITS ARE FULL RATED TO 50 C IN FREE AIR MUST BE FAN COOLED WHEN MOUNTED IN CON FINED AREA TEMPERATURE RATING 0 50 C 100 60 C 60 70 C 40 EFFICIENCY COMBINED EFFICIENCY APPR...

Страница 116: ...l DOY CAPACITOR FIUI CR2 4 AE S AE S RECTIFIER jA 100Y CRS AEIC AEIC RECTIFIER 1A 200Y CR6 IN752A lN752A ZEmR DIODE OOHII CR7 IN75 A IN75 A Rl 7 12 47 47 R2 20 2 2K 2 2K R3 750 750 R4 6 9 9 R5 8 18 6 8 6 8 RESISTOR 1 2W CF R9 11 16 1 5K 1 5K Rl 150 1 0 R14 2 7 2 RI7 I9 0 0 R21 1 11 1 11 RIO 22 1500 1500 POTENTIOMETER 2W WW RIS 22 22 RES I STOR 2W WI SCRI S03C8L 53 SO 08L SCR 8A JOY SCR2 S030JLS S0...

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Страница 118: ...hon and IS delivered upOn ftle elpressecl condition th t II will not De used directly Of Indirectly In any way delremttnt 10 tne Interest ot CORVUS SYSTEMS DRAWN B f H FI II PCO REV UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ON ANGLES DECIMALS MATERIAL XX 1 __ __ 4 x X_X_ _ CHECKED BY COtJNECTION CHART J 1 S 3 8 9 II T lISED APPLICATlON NEXT ASSY USED ON FINISH APPAQVED SCALE r...

Страница 119: ...R O l O 1 19 4 c r r r f f _ _ t 4 Ib 12 32 N Jf5 KEP 340 ObC 3 t 1 5 I B t _8 _14 M T 6 __ K IT L _T_O __ 3 _ _088_ _2 _0_ _30 _ I 3 MTG T APAurOR OBe 20 2 9 1 2 4000 5 V CA P A C 7 IT O R A1 L U7 M L E C 1 0 3 1O O 30 _ I f t t O R l 0 0 O O E B R O G r 40 0 2 S 3 t _ _ ______ _ _ _ ____ _ _ _____ _____ __ __ 1 7 I C VOLTAb REGULATOR Ul 130 2 04 14 1 BPl 1 4PL c B CP4 1 MATERIAL FINISH A 105 414...

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Страница 122: ......

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Страница 125: ...E F CRRO XC VK200 IO 3e CT I AS 5 PARAT 6NO A D 5V PlANe WITH GNDS BR Ql GI4T IN F R0tv EDGE CONNECTOR 2 UOT D 5 4 I ALL R STDR 1J4 W Ut JL 5S MaTeD OTC 5 TO T L _ _ 5V R 2 510 R2e S 510 Ql Z_ IO iD 5G 101 l1 sv R l ii 4 R42 510 I _ 5V R3 1 4 I 8 A A _ e g ox 310002 7 6 5 4 SCHEMATIC OWG ASM 310001 1 OF 4 3 2 lSHT Ot 4 ...

Страница 126: ...WG ASM 310001 2 OF 4 5 _o _rz w FAlX T __ I o Pfl NJP VP GA 1 1 i l lWRlTC I J v V RaO 1 001 I A I UOK 1 6 Rb 3 2K 19 RIO L_ _ I __ I _ _ I4 o_ OWRlTC RIve 5V 2 _ 1 i14 U I7V 7 Jt4 TIn T 4 J HAR 0 J CM o _ I_ 5V CAR O A 1w Dl iAl II J _4 _ _4 CAR I lO o 6 _ j CI6 001 rt 9f _ _ _ 6 _ 412 __ 8 7 6 5 I 4 3 2 1 310002 _ l 1 I r r _r EC _ oc owM 0IIDI _1IO 11 1 8 D c B A ...

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Страница 131: ... eo l r 50 04lP I C60 1 I 4VDC 5 RSO 1 51 i 5 5 32L o RI06 II 1 0 _ __ __ _ I V _ c T1l 1lIIlNE 5MaET I 5V L t sv 1 r r iV _ w II PRe 4V T 5 1 5 1 t 5 RPq 510 5 4 SCHEMATIC DWG ASM 310101 2 OF 3 L 7 IO O SEL 7 O 5E L I L zq CMlP e LE I 12 V Ir t1 6 U _ _ _ H 5 1 L __ _ w_ 3 _ _ _ 7 4 WR T5 SE R Z 50 5 7 12 _ _t 1211 _ 5V 1 t C36 I O 45 46 HAR 6 1 O llZ0f 1 WARZ 4Z Sv _ JV A j WRITE GATE F __ __ t ...

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Страница 137: ...M J P I J QTY LOCATJ 7 108 IC S 4Iq 0308 0 IE III IC 1 41 C PI O Oq4 0 18 E liZ IC MC 334k 03QClqO 0 sr 20 CAP POLy OO t 031 2 52 0 C17 CIS CAP CERM 039 1 JOJ 5 J t 040DI D CB Of TIlAN5JfTOl IN Z9S 031243 0 QIS 17 if TJ AN5UTtJK 2 Y JOO 01 24 D QIS 17 09 TMNSIS TlJIt ZN6SDI D3JZ4S 0 r JIS 17 59 ES I S SZ l 03 7 Z 0 RI49 S9 E5S V S 10Jl n05 9 5CALE fl lONE N N o trI oil 3 Hf __i OtoaJD TPII OO TPS ...

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Страница 142: ... T PI T C2 J TPI 0022 4 4Ir 4 Y 3 Vi3 t V _ JV e__ J R 9 1 K c f2 00 13 C oc 1 loO pfSI4 I 2 II 5 J 2 k 0 12 V 5 t 4 SCHEMATIC OWG ASM 310006 1 Of 3 6 fC 0o CI V vvl _ Qil 4 7 O 6 7 7 cS 6 l c It l L IN 1 2l1 C I 1 I 41 f71 unn n z 2 1 1t6 R1 f S 81D Ii 11 f c IZ R2 I O l I 8 2S T IIL Iol A I _ _ 17 5 fk Io4 a_ f __ _ v 22 C 3 _ 1 r s MRf Cft t lllj NlL A r D A c B ...

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Страница 148: ......

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Страница 170: ...CORVUS DEALER SERVICE INDEX ...

Страница 171: ...lectronics drive 6 5 9 5 3 5 Environmental requirements 3 5 Error codes 9 4 Fan 4 6 Format bottom level diagnostic 3 3 2 data 5 2 Fuse 2 4 9 5 3 3 144 Handling shipping 2 3 Headlock 2 3 1 4 6 3 9 6 1 Heads R W 1 6 4 5 4 6 2 IBMDOS 9 5 4 8 Initialization drive 9 5 4 8 Installation 2 4 Interface cable 2 4 Interface PCA 5 9 9 5 3 2 9 5 4 7 Interleaving Specification 4 6 2 LEOs front bezel 2 4 3 3 1 9...

Страница 172: ... 5 3 3 7 4 7 4 2 9 5 3 5 9 5 4 4 9 6 3 Adjustment 7 4 1 PCA 4 6 5 Servo tracks 5 3 1 9 5 3 6 Spare track table 2 3 2 4 6 1 9 5 4 3 Stand alone drives disassembly 6 4 Static electricity 3 5 1 Status byte 5 5 3 STROBE 5 5 1 Switches front bezel 2 4 3 3 3 3 2 4 6 6 power 2 4 unit address 2 5 145 TARGET VELOCITY 5 3 3 Temperature 3 5 3 Tools 6 2 1 9 3 Track 4 5 Track diagnostic program 8 7 Tri Rit siQ...

Страница 173: ... orvus Systems Inc I 2100 Corvus Drive I San 40se California 95124 408 559 7000 I Telex 278976 ...

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