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Страница 1: ...HEWLETT PACKARD HP 7957A AND HP 7958A DISC DRIVES HARDWARE SUPPORT MANUAL ...

Страница 2: ...pecifications Actual inspection and test data per taining to this order is on file and available for examination Hewlett Packard s calibration measurements are traceable to the National Bureau of Standards to the extent allowed by the Bureau s calibration facilities The Hewlett Packard Quality Program satisfies the require ments of FAR 52 246 15 ...

Страница 3: ...7 90803 Printed SEPTEMBER 1987 Printed in U S A MODELS COVERED Edition 2 E0987 This manual covers the following models HP 7957A and HP 7958A OPTIONS COVERED In addition to the standard model this manual covers the following options 015 550 r11 HEWLETT a PACKARD HEWLETT PACKARD P O Box 39 Boise Idaho 83707 0039 ...

Страница 4: ...adio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio and television reception It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules which are designed to provide reasonable protectio...

Страница 5: ... set Whenever it is likely that the protection has been impaired the product must be made inoperative and be secured against any unintended operation BEFORE APPLYING POWER Verify that the product is configured to match the available main power source according to the input power con figuration instructions provided in this manual If this product is to be operated with an autotrans former make sure...

Страница 6: ... Edition 1 DECEMBER 1986 Edition 2 SEPTEMBER 1987 Herstellerbescheinigung Hiermit wird bescheinigt daB das Gerat System HP 7957A HP 7958A in Obereinstimmung mit den Bestimmungen von Postverfligung 1046 84 funkentstort ist Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates Systems angezeigt und die Berechtigung zur Oberpriifung der Serie auf Einhaltung der Bestimmungen eingeraumt Ma...

Страница 7: ...e Operating Features 2 8 Drive Head Selection Sequence 2 8 Media Fc rmat 2 12 Sector Format 2 12 Sector Offset 2 12 CS 80 Command Set Implementation 2 12 Chapter 3 Theory Of Operation Page 3 1 Introdllction 3 1 CS80 ESDI Controller CEC PCA A2 3 1 Transfers 3 2 Disc Format 3 2 Sparing 3 5 Sequencc 3 5 Sector SI aring 3 5 Track Sparing 3 5 Errors 3 6 Error Definition 3 6 Error Logs 3 6 Error Detecti...

Страница 8: ...ol Clock Generator And Stretcher Circuit 3 14 Disc Data Controller DDC IC 3 14 Remote DMA Transfer 3 15 ESDI PAL 3 16 Write Gate And Address Mark Enable Delay Circuit 3 16 Error Correction 3 16 Format 3 17 HP IB Interface IC 3 17 Buffers 3 1 7 DMA Bus Arbiter 3 18 Local DMA Transfers 3 18 Microprocessor Transfers 3 18 Remote DMA Transfers 3 18 EEPROM When Used 3 18 LED Control 3 19 Chapter 4 Page ...

Страница 9: ...ite ECC Test 4 21 Build Spare Tables 4 22 Copy EEPROM Logs to Self Test Cylinder for drives with EEPROM only 4 2 Finish HP IB Interface IC Initialization 4 22 Request Status 4 22 Request Status Example 4 23 Utilities 4 23 Run Time and Fault Logs Media Based 4 24 Run Time and Fault Logs EEPROM Based 4 24 EEPROl l 4 25 Fault Status Bytes 4 26 Physical Jt ddress Reporting 4 27 Run Time Sectors Read C...

Страница 10: ...roubleshooting 4 39 Chapter 5 Page 5 1 Remo al and Replacement Introduction 5 1 Preparation For Service 5 3 Removal and Replacement 5 3 Top Shroud 5 3 Front Panel 5 3 LED Cable Removal 5 4 ROM RemovaL 5 4 CS80 ESDI Controller CEC PCA A2 5 4 Fan 5 5 Power Supply Assembly PCA A3 5 5 Disc Drive Assembly HDA PCA A I 5 6 Tray Removal and Replacement 5 6 Chapter 6 Replaceable Parts Page 6 1 Introduction...

Страница 11: ...CS80 ESDI Controller CEC PCA A2 Layout and Cable Connections 4 4 Figure 4 3 Disc Drive Assembly PCA Al Layout and Cable Connections 4 5 Figure 4 4 Power Supply PCA A3 Test Points and Voltages 4 6 Figure 4 5 Cabling Diagram 4 7 Figure 4 6 Self Test Display 4 11 Figure 4 7 Signal Distribution 4 47 Figure 5 1 Order of Disassembly 5 2 Figure 6 1 Disc Drive Exploded View 6 3 Table 1 1 Disc Drive Charac...

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Страница 13: ... host Go no go test results are indi cated by a green red indicator on the front panel If a failure occurs information on the cause of the failure can be determined by viewing the status of the green red indicators The disc drive is packaged in a stand alone desktop cabinet AClcessories available include a desk height stand alone cabinet designed to hold the disc drive and other desktop stack modu...

Страница 14: ...or instruction set in formation refer to the CS 80 Instruction Set 1 2 Programming Manual part no 5955 3442 For additional service information refer to the CS 80 External Exerciser Reference Manual part no 5955 3462 The CE Handbook for the HP 7957A and HP 7958A Disc Drive is part no 07957 90905 1 5 CHARACTERISTICS Characteristics of the disc drive including physical dimensions and power requiremen...

Страница 15: ...panel VOLTAGE SELECTOR switch Voltage true RMS 115V range 100V 115V 120V single phase Freqw3ncy Typical Current Typical Power SIZE EIGHT Height Width Depth Net W dght Shipping Weight inclusive tolerance range is 90V to 132V 230V range 220V 240V single phase inclusive tolerance range is 180V to 264V 47 5 to 66 Hz true RMS 115V range 0 87A 230V range 0 48A 115V range 65W 230V range 65W 132 mm 5 2 in...

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Страница 17: ...s Serial Mode Operation 10 Megabit Per Second Transfer Rate Configuration Reporting Drive Hard Sectoring Daisy Chain Configuration up to 7 drives Power On Sequencing Track Offsets Internal Self Test Diagnostics Media Defect List 2 3 DRIVE INTERFACE CHARACTERISTICS 2 The drive complies with the physical interface characteristics defined in the ESDI specification Refer to the specification for cabli...

Страница 18: ...sponds by set ting ATTENTION and Invalid Or Unimplemented Command status bit If the controller attempts to read with an invalid head the read will be executed with the last valid head selected WRITE GATE The WRITE GATE timing used during formatting and normal writing is shown in figures 2 2 and 2 3 respectively HEAD SELECT LINES When selecting a head the controller must ensure that all head select...

Страница 19: ...Interface Information 7957A 7958A DRIVE RESPONSE HEX DEC 05DD 1501 0000 0 00 0 5780 22400 015E 350 0040 64 OC 12 2E 46 OOOE 13 0001 1 When formatting the disc media the controll er must activate WRITE GATE a minimum of 2 5 microseconds before the beginning of the Address PLO Sync field see figure 2 2 Once activated WRITE GATE may remain active for the entire track If deactivated WRITE GATE must re...

Страница 20: ...s an internal power on reset operation to occur e g a momen tary loss of dc power The controller may have to reconfigure drive operat ing conditions The controller should also check the Spindle Motor Stopped status bit bit 9 and perform a motor on sequence if necessary Command Data Parity Fault This bit indicates that the drive detected a parity error on the serial command data received from the c...

Страница 21: ...the con troller should retry the write operation a minimum of five times For simplification the controller may elect to use the same recovery routine recommended for the preceding Write Gate With Track Offset fault A Write Fault can be caused by one of the following conditions The controller activated WRITE GATE while the head was physically off track center The controller activated WRITE GATE whi...

Страница 22: ...ch When performing a read following a write READ GATE should not be activated for at least 500 nanoseconds after WRITE GATE is deactivated 2 6 HEAD SELECTED 2 HP 7957A HP 7958A 0 1 0 1 0 1 0 1 0 1 0 1 X 0 0 1 1 2 2 3 3 4 4 5 5 Inv 6 Inv 7 Inv Inv Inv Inv Inv Inv Inv Inv Inv Inv READ GATE must be deactivated when passing over a Write Splice READ GATE must be deactivated a minimum of 100 nanoseconds...

Страница 23: ...12 Figure 2 3 Write Gate Timing During Normal Write READY This signal is used as defined in the ESDI specification COMMAND DATA The following commands are supported by the drive refer to table 2 5 Seek Recalibrate Request Status Request Configuration Select Head Group Control Reset Interface Stop Spindle Motor Start Spindle Motor Track Offset Initiate Diagnostics All other commands and reserved co...

Страница 24: ...See figure 2 7 for track offset definition 2 5 DRIVE OPERATING FEATURES The following paragraphs explain specific operat ing features of the drive The controller can ex ploit the full performance of the drive by utilizing these features 2 8 2 6 DRIVE HEAD SELECTION SEQUENCE Before performing a data transfer with a drive the controller may have to initiate up to three separate operations drive sele...

Страница 25: ...turn Addressing Mode General Purpose Commands Spare Block Describe Locate and Verify Release Release Denied Copy Data Initialize Media Diagnostic Commands Request Status refer to Table 2 7 Request Status Summary Initiate Utility refer to table 2 7 No execution message Device will receive execution message Device will send execution message yes Implemented as defined by CS 80 no Will return illegal...

Страница 26: ... transfer of last bit no maximum time I imit is imposed on the next transition of TRANSFER REO ONE BIT TRANSFER TO DRIVE TRANSFER REO 0 1 ld 250 NS MAX 0 TRANSFER ACK 1 CONFIG STATUS DATA 100 NS MIN L I d d 50 NS MIN 10 MS MAX 150 MS 250 MS VALID Following transfer of last bit no maximum time limit is imposed on the next transition of TRANSFER REO ONE BIT TRANSFER FROM DRIVE IESDIAOt 2 10 NS MS MI...

Страница 27: ... head select will be performed as a separate operation resulting in an additional delay as the new head seeks to the target track 5 When the newly selected head has arrived at the target track the drive asserts COMMAND COMPLETE T5 This sequence assumes that all three operations are necessary however it also applies to simpler situations For example if the controller wants to access a different tra...

Страница 28: ...ytes of the sector are available for use by the controller Although sector format is user dependent it is recommended that the format used conform to the fixed sector format example con tained in the ESDI specification 2 12 2 9 SECTOR OFFSET The sector offset also improves the performance of data transfers that include successive cylinders When the end of a cylinder is reached the drive must perfo...

Страница 29: ...TOR 0 10 104 OFFSE T T1 I I 20 I INDEX U SECTOR 0 i OFFSET I 10 T1 1 I I u SECTOR 0 T1 HEAD SWITCH DELAY Figure 2 9 Sector Offset INDEX Interface Information 7957A 7958A DATA SURFACE 0 DATA SURFACE 1 DATA SURFACE 2 2 13 ...

Страница 30: ...smit Access Errors Illegal Parallel Operation only support 1 unit Uninitialized Media formatted at factory No Spares Available Not Ready Write Protect No Data Found Unrecoverable Data Overflow Unrecoverable Data End of File only for tapes End of Volume Information Errors Operator Request release never requested Diagnostic Request release never requested Internal Maintenance release never requested...

Страница 31: ...Read Fault Log Read Run Time Log Read Error Rate Test Log Measure Seek Time Read Spare Table Locatie and Read Full Sector Servo Test Pattern Error Rate Test Random Error Rate Test Read Only Error Rate Test Send Execution Message Read Only Random Error Rate Test Read ROM Revision number Read Defect List Receive Execution Message No commands are implemented for this option Interface Information 7957...

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Страница 33: ...s One read write head is used for each disc surface The bottom surface of the lowest disc in the stack contains continuous prerecorded servo data which is used to ensure the precise positioning of the read write heads 3 The power supply PCA A3 provides regulated 5V and 12V to the CEC and HDA Two LED s red and green on the front panel provide information on the disc drive status see figure 4 6 3 2 ...

Страница 34: ... DDC and the buffers The JP transfer 3 2 is for transfer of information between the JP and DMA bus The remote transfer is for transfer of information from the HP IB Interface IC and the buffers Paragraphs 3 43 3 44 and 3 45 provide the sequence of events for each transfer See figure 3 6 when using the transfer sequence paragraphs 3 4 DISC FORMAT The plated metal discs in the HDA PCA A1 provides fi...

Страница 35: ... 6 SPARE TRACKS GUARD TRACK SELF TEST TRACK LANDING ZONE FOR DISC DRIVES WITHOUT AN EEPROM Figure 3 1 Disc Recording Format Table 3 1 Disc Drive Capacity Data Bytes Sectors Tracks Heads Per Per Per Per 256 16 128 63 16 337 664 63 819 1013 81 688 320 319 095 5 065 5 130 701 312 510 552 8 104 8 one spare sector per track and six spare tracks per head 3 3 ...

Страница 36: ...t ion 6 bytes 1 byte cyl inder most significant bit 1 byte cylinder least significant bit 1 byte for head address 1 byte for sector address 1 byte for status byte Loaded With FF 2 bytes for verifying address field when address field is read 2 bytes for field address check codes for file integrity 1 byte allows internal circuits sufticent time to ensure dato recovery Controller sends 00 at this tim...

Страница 37: ...d to Buffc r 0 and Buffer 1 except for the bad sector Theory Of Operation 7957 7958 Unrecoverable errors on any other sector will cause the sparing operation to terminate and an unrecoverable error will be reported The disc drive then writes the bad sector header with the defective sector number 255 FF and subsequent sectors are numbered sequentially starting with the sector being spared Data is w...

Страница 38: ... and the error is not correctable during retries The run time error detection and correc tion sequence is described as follows An error is detected on read by the Eee cir cuits inside the DOC Retries are initiated On each retry data is read and checked by the EeC circuits The first retry is done on track center The retry is then done one time with a 80 mic roinch offset then one time with a 80 mic...

Страница 39: ... The circulating air is passed through a filter For pressure equalization the clean area breathes to the outside via another filter Inside the clean area are three or five magnetic discs depending on the model the servo head and from five or eight recording heads again depend ing on the model and the rotary voice coil positioner The surface of the disc that is nearest the die cast base is used for...

Страница 40: ... WOA r WRITE DATA WRITE CLOCK I ENCODER I T I I NRZ READ I I DATA 2 7 RDA P I L OECODERI L I__ I 0 I I I l I I I I I REF ERE NCE I I CLOCK jrr CLOCK MUX I I t t I I I I I I I WRITE CATE I R W CONTROL II R E A D t _ u fT I FAUL T DE T I CATE I J L _______ J READ WRITE HEAD SELECT and AMP SERVO PLO I POSITIONER SERVO CHANNEL INDEX LOGIC SECTOR LOGIC GUARD BAND LOGIC CONTROL CONTROL LOG IC INDEX SECT...

Страница 41: ...ower filtering and reference voltage generator Theory Of Operation 7957 7958 3 17 DEVICE ELECTRONICS BOARD The remaining electronic components are mounted on the Device Electronics board which provides the overall control functions for the drive The board contains microprocessor based control logic and interface drivers and receivers The board provides the following functions Power up and power do...

Страница 42: ...the signal is digitized and applied to a pulse former circuit which generates the Read Data signal The read data is decoded from 2 7 RLL data to NRZ data and passed to the controller via balanced differential data lines NRZ Read Data with its associated read clocks transmitted via the Read Reference Clock 3 21 READ REFERENCE CLOCK MULTIPLEXER When Read Gate is not asserted Read Reference Clock sig...

Страница 43: ...st points at the front of PCA A3 see figure 3 6 The output voltages are not adjustable The power supply Theory Of Operation 7957 7958 voltages are connected to CEC PCA A2 and Disc Drive Assembly PCA Al via cable assembly WI The following paragraphs provide a more detailed description of the Power Supply Assembly PCA A3 circuitry as shown in figure 3 6 Refer to table 3 3 for a description of the mn...

Страница 44: ...rred by DMA from the buffers to the HP IB Interface IC This is referred to as a remote DMA transfer 3 12 The data is transferred from the HP IB Interface IC to the host over the HP IB bus 3 29 CEC FUNCTIONAL THEORY The CS80 ESDI Controller CEC PCA A2 controls the data transfer between the HP IB host com puter implementing the CS 80 instruction set and the Disc Drive Assembly HDA PCA Al im plementi...

Страница 45: ...uring these transfers When the microprocessor accesses the HP IB Interface IC DDC or Buffer 0 Transceiver 1 is disabled When the microprocessor accesses Buffer 1 Transceiver I is enabled Transfers to and from the microprocessor are I byte long Theory Of Operation 7957 7958 3 31 MICROPROCESSOR DATA BUS The following devices reside on the microproces sor data bus Microprocessor 32k by 8 ROM for prog...

Страница 46: ...ocessor The state machine looks for any of the DMA bus 3 14 chip selects to be asserted at a point in time when they are guaranteed to be valid If one of them is asserted then the state machine goes to a state where E is held high Q is held low and NUREQ is asserted low The state machine remains in this state until an internal STPSTR stop stretch is as serted high This signifies that the microproc...

Страница 47: ...Of Operation 7957 7958 Outputs data onto DMA data bus and generates NDMAWR to strobe data into buffers Increments buffer address counter by 2 for next transfer This process of filling and emptying the buffer is repeated until the entire transfer is complete For a write data operation the microprocessor sets up the DDC for the number of sectors to be written the starting sector number the starting ...

Страница 48: ...PAL counter delays the leading edge of READ GATE until the head is over the header 3 16 PLO sync field in order to avoid this problem When the ESDI PAL detects an INDEX or SECTOR pulse counting is enabled by setting CNT high The ESDI PAL asserts RGEN high The microprocessor must set up this READ GATE delay at power on initialization It does this by writing a 7 bit value into the the counter Once t...

Страница 49: ...tion 7957 7958 The HP IB Interface IC is operated in the 8 bit mode since the microprocessor is an 8 bit device Remote DMA transfers are also 8 bits wide however if the transfer is from the HP IB Interface IC to Buffers 0 and 1 then the ninth and tenth bits DO and 01 are latched Both DO and 01 are latched by DQCLK which is equivalent to NIOGO when the transfer direction is from the HP IB Interface...

Страница 50: ...44 REMOTE DMA TRANSFERS Remote transfer requests come from two sources the DOC and the HP IB Interface IC The DOC asserts RREQ high and the HP IB Interface IC asserts NHPIBR Not HP IB Read low to make a request Both requests and NREMGO must be asserted in order for a remote request to be recognized by the DMA Bus Arbiter Before the transfer can be acknowledged the DMA Bus Arbiter must also be in t...

Страница 51: ...peration then the address which is currently being written to may end up with bad data however no other address locations should be corrupted 3 46 LED CONTROL Theory Of Operation 7957 7958 The LED CONTROL circuit sets the condition of the two front panel LEOs When the disc drive is in an active state the green LED blinks once every 68 ms If the disc drive fails self test the green LED is turned of...

Страница 52: ...ion and Stretcher circuit NDMAWR Not DMA Write DOC Control Clock Generation and Stretcher circuit For disc drives with an EEPROM only 3 20 Description Used to enable ap propriate address and chip select functions during a microprocessor transaction Used to drive DMA Bus Arbiter Clock signal from DMA PAL for remote Used to clock informa tion into and from EEPROM Line use to transfer in formation in...

Страница 53: ...7 7958 Description Signal to DMA Bus Arbiter requesting a remote transfer Signal used to strobe in formation into and out of the HP IB Interface IC Read Write strobe This signal signifies that a local transfer is taking place Enables buffer chip select signals This signal is activated for a Remote transfer Terminates with a byte tagged with EOI Input to HP IB Interface circuits to set direction of...

Страница 54: ...te Enable Control Clock Generation and Stretcher circuit Stop Stretch Control Clock Generation and Stretcher Microprocessor Enable DMA Bus Arbiter Description Control signal to DMA Bus Arbiter requesting a remote transfer Signal to enable micro processor to DMA bus Signal used to Terminal Clock Stretch Enable microprocessor for access to DMA bus ...

Страница 55: ...dicate Do not turn the LINE switch off when the system is transferring data on the Hewlett Packard Interface Bus HP IB This can be identified by a flashing green front panel LED Do not cycle the LINE switch on and off unnecessarily Do not connect or disconnect the HP IB cable s from the disc drive when the system is transferring data on the HP IB NOTE For HP 7957A and HP 7958A Disc Drives with a C...

Страница 56: ... 5 show the locations of the cable connectors on the three FRA s in the disc drive and the cables coupled to these connectors Figure 6 1 Disc Drive Exploded View shows how the cables are connected between the FRA s An overall cabling diagram of the disc drive is provided in Figure 4 5 Cabling Diagram Signal Distribution Cable connections between the FRA s in the disc drive are shown in figure 4 5 ...

Страница 57: ...2 CONTROLLER POWER SUPPLY PCA A3 COMPONENT SIDE A field replaceable assembly l DISC DRIVE PCA Al 2 CS80 ESol CONTROLLER CEC PCA A2 2 CEC PCA A2 Figure 4 1 Field Replaceable Assem ly FRA Location Service Inf ormation 7957A 7958A 4 3 ...

Страница 58: ...Service Information 7957A 7958A 57957825 Ftgure 4 4 EEPROM U 112 HP IB SWI TCH MAY OR MAY NOT BE ON peA A3 ...

Страница 59: ...SOLDER SIDE OF peA THERE IS A KEYSEAT BETWEEN PINS 4 AND 6 2 J2 PINS ARE NUMBERED 1 THRU 34 EVEN NUMBERED PINS ARE ON SOLDER SIDE OF peA THERE IS A KEYSEAT BETWEEN PINS 4 AND 6 3 J3 IS NUMBERED AS SHOWN cr 23 W2 Service Inforination 7957A 7958A POWER SUPPLY ASSEMBLY peA A3 4 5 ...

Страница 60: ...TAGE RANGE 11 4 TO 12 6V 11 64 TO 12 36V 2 4V TYPICALLY 4 0V 4 85 TO 5 15V 11 0 TO 13 OV NOTE 1 12V IS NOT USED IN THE HP 7957 AND HP 7958 2 USE RET GND TEST POINT FOR VOLTMETER RETURN 3 THE OUTPUT VOLTAGES ARE NOT ADJUSTABLE 4 MAXIMUM RIPPLE 5V SUPPLY 50 mV P P 12V SUPPLIES 100 mV P P 5V GND ...

Страница 61: ... I I I DISC DRIVE ASSEMBLY A1 FRA 1 W3P2 Jl I I CONTROL I I W2P2 2 I I DATA I I HDA GND LUG I J3 I __ l J5 r J W1P2 l J W4Pl J3 1 I J4 I L W1P3l J W1P4l r POWER SUPPLY ASSEMBLY A3 FRA3 J 11 79571 05 J Pl I I Wl I I I B1Pl I Y W4 Wl W4P2 1 FRONT PANEL FAULT ON LINE LEOs mFANB1 Figure 5 a mg Diagram 4 7 ...

Страница 62: ...oses The location of these test points is shown in Figure 4 4 Power Supply PCA A3 Test Points and Voltages Also provided are specifications for the voltages monitored at the test points The output voltages are not adjustable It should be noted that access to the test points requires the removal of the front panel assembly from the disc drive Refer to chapter V for removal details CSj80 Implementat...

Страница 63: ...M test for disc drives with EEPROM only 4 13 CS 80 Describe Command Response In response to a CS 80 DESCRIBE command the disc CEC will respond with the following information CONTROLLER DESCRIPTION FIELD INSTALLED UNIT 1 bit for each unit 1000 0000 0000 0001 MAXIMUM TRANSFER RATE 1000 K BYTES SEC CONTROLLER TYPE 0 INTEGRATED SINGLE UNIT CONTROLLER UNIT 0 DESCRIPTION FIELD GENERIC DEVICE TYPE 0 FIXE...

Страница 64: ... flashing green indicating that the self test failure has occurred but that the self test routines are still accomplishing some housekeeping tasks When these tasks are complete the green indicator will extinguish indicating that the disc drive is ready to accept host commands such as diagnostics The green indicator will flash again when the disc drive attempts to respond to these commands A solid ...

Страница 65: ...OWER ON WHILE CONTROLLER RUNS SELF TEST AND DISC MECHANISM SPINS UP IF EITHER CONTROLLER SELF TEST OR MECHANISM SPIN UP FAILS THEN BOTH LED s REMAIN ON EXECUTING SELF TEST OR DISC DRIVE ACTIVE DISC DRIVE HAS FAILED MECHANISM SELF TEST THE DISC DRIVE MAY STILL BE ACCESSED BY THE HOST CPU TO RUN DIAGNOSTICS DISC DRIVE IS IN A READY STATE DISC DRIVE IS ACTIVE i e PROCESSING A COMMAND Figure 4 6 4 11 ...

Страница 66: ... set It is strongly recommended that the host not attempt to access data on the disc drive or issue commands to the disc drive if the power on self test has failed Note Faults which occur during run time do not affect the red or green LED After power on and completion of self test circuits monitor the operation of the disc drive and log run time errors and faults on the maintenance track Details o...

Страница 67: ...ime Error Log Read Error ERT Log Measure Seek Time Read Spare Table Locate and Read Full Sector Servo Test Pattern Error Rate Test ERT Random Pattern Error Rate Test ERT Read Only Error Rate Test ERT Random Read Only Error Rate Test ERT Read ROM Revision Number These utilities provide both a NO EXECUTION MESSAGE and a SEND EXECUTION MESSAGE depending upon the bits set in the Initiate Utility comma...

Страница 68: ...inst the loaded values and a mismatch in any register causes the firmware to loop forever at the point where the error was detected The purpose of the infinite loop is to assure that the CEC PCA A2 will not attempt to come on line Fault Reporting The only means of communicating a failure to the user is through the two LED s Both the red and green LED s will remain on indefinitely Note Without moni...

Страница 69: ...will be indistinguishable from a Microprocessor Self Test Failure RAM Self Test Failure or a Buffer Self Test Failure 4 22 HP IB Interface IC Loopback Test Limitations Data patterns are written to the internal Outbound FIFO and are read back through the Inbound FIFO A check is made to see that the last byte is tagged with EOI as it should be This test does not attempt to check functionality of mos...

Страница 70: ...a failure to the user is through the two LED s Both the red and green LED s will remain on indefinitely Note Without monitoring the address of the firmware loop this fault will be indistinguishable from a Microprocessor Self Test Failure ROM Checksum Failure or a RAM Self Test Failure 4 24 Hardware Software Initialization 4 25 Select A Drive 4 16 Process The Disc CEC PCA A2 IC is initialized and p...

Страница 71: ...ne and report the nature of subsequent self test failures using the CS 80 status bytes PI P2 P3 P7 P8 and P9 This does not mean that subsequent self test failures are less critical or that the disc drive is operable On the contrary it is strongly advisable for the host not to issue commands to the Disc Drive Assembly PCA AI after any self test failure If the diagnostic result bit is set during the...

Страница 72: ...atus and least significant byte of the vendor unique status are returned to the host Information from the l6 bit word is compressed into the ESDI status word If the vendor unique status available bit is not set then several of the other status bits are checked If any of these bits are set a fault is generated The fault and ESDI status will be returned to the host Compressed ESDI status 7 6 bits SM...

Страница 73: ...the Disc Drive Assembly PCA AI are also suspect but no FRA number exists for this component P7 will contain either fault 75 if the attention line was not reset or a fault number describing the ESDI communication problem if that condition occurred P8 and P9 will contain the status associated with the fault number stored in P7 Note At this point it is strongly advisable for the host not to attempt a...

Страница 74: ...results in 64 sectors per track Fault Reporting The disc drive comes on line and reports self test fault 73 in P3 The diagnostic result bit will be set PI contains the code for the first suspect FRA A one I indicates Disc Drive Assembly PCA A 1 P2 contains the code for the second suspect FRA A two 2 indicates CEC PCA A2 P7 will contain the fault number describing the ESDI communication problem P8 ...

Страница 75: ...at physical cylinder O Starting on head 0 up to 5 sectors are tried in an attempt to find one which can be read and written 10 times without an error If five sectors are tried unsuccessfully self test fault 67 is generated to indicated that the Read Write retry count was exhausted If any other fault is detected during the read write test it will be reported As soon as a fault occurs testing stops ...

Страница 76: ...entire 512 byte EEPROM is copied to maximum logical sector 1 and maximum logical sector of each head on the 00 self test cylinder It is hoped that one of these redundant copies will be readable when the Disc Drive Assembly PCA AI is returned to the factory Faults can be generated during the process of copying the EEPROM to the self test cylinder but the diagnostic result bit should not be set 4 36...

Страница 77: ...t FRA is PCA AI Disc Drive Assembly HDA P2 indicates that the next most suspect FRA is PCA A2 CSSO ESDI Controller CEC P3 indicates that the failed self test subtest is 4E hex which is defined in table 4 2 as One of the 4 seek diagnostic tests failed P7 contains the fault code 4E and PS contains the ESDI status with bit 2 set indicating a seek fault Note P7 may contain a fault code other than 4E i...

Страница 78: ... Error Log The disc drive does not request release to store the error information The Read Run Time Error Log utility extracts the run time error information from the maintenance track and returns it to the host Faults which occur during utilities diagnostics and run time activities are with a few exceptions see fault ranges stored in the maintenance track Fault Log The CEC PCA A2 will not respond...

Страница 79: ...ed in functional groups for ease of use Each group of faults identifies which parameter byte s is affected by the fault The EEPROM is used as a circular buffer where the oldest information is overwritten once the buffer is full Since the process of overwriting old fault error information is anticipated a fault is not generated when it occurs There will be a total of 50 entries in the EEPROM Faults...

Страница 80: ...by the fault code number Errors are in the range 20H through 3FH Fault code numbers may have any other number except 0 which is reserved 4 43 Fault Status Bytes 4 26 The contents of the two status bytes which are associated with a Fault entry depends on Fault code of that entry The range of all possible Fault codes OOH FFH has been divided into subranges for the purpose of defining appropriate con...

Страница 81: ...ate interlock Vendor Unique status Only the least significant byte of the first word of vendor unique status is saved This information is not available to the field 4 44 Physical Address Reporting Faults will normally be reported with a logical address as is shown in paragraph 4 53 If the seek preceding the occurrence of the fault was a physical seek then the current logical cylinder and target lo...

Страница 82: ... if power is lost before the RAM based count is added to the EEPROM based count an inaccuracy equal to the RAM based count occurs Note Reading the run time error log also updates the EEPROM count with the total of the RAM based count and the EEPROM count 4 46 Error Rate Test ERT Log 4 28 The RAM based ERT table will store data error information on a maximum of 50 locations The log is allocated in ...

Страница 83: ...ror byte serves two functions 1 If bit 0 and bit 1 are set simultaneously a FIFO data loss has occurred during a write operation This is a condition from which the write firmware can recover It is reported because a high frequency of occurrence can affect drive performance None of the location bits will be set 2 The second function is reported when bit 0 is set along with bit 2 bit 3 or bit 4 This...

Страница 84: ...be maintained 4 51 Faults Errors During Error Rate Testing 4 30 Faults If a fault is encountered the ERT is halted and the state of the machine is saved QSTAT is set and the status will indicate the fault The host may continue the test by sending the ERT command sequence with the loop count set to zero A fault is generated during error rate testing if the ERT log overflows The host is allowed to r...

Страница 85: ... Current logical cylinder 2 bytes Current logical head 1 byte Logical sector 1 byte Target logical cy 1inder 2 bytes Target logical head 1 byte Logical sector 1 byte Fault code byte Status byte Status byte Refer to paragraph 4 43 for a description of the contents of the status bytes Refer to paragraph 4 44 for a description of physical address reporting for faults 4 54 Read Run Time Error Log MICR...

Страница 86: ...recoverable error byte format bit 7 byte sync no data sync or sector overrun bit 6 error in header field bit 5 error in data field bit 4 unrecoverable data error a 11 retries exhausted bit 3 ECC marginal data error bit 2 retry marginal data error more than 1 retry requ ired bit 1 recoverable on the first retry bit 0 FIFO data lost or track offset invoked 4 55 Read Error ERT Log 4 32 MICRO OPCODE P...

Страница 87: ...n once at the same location i e same physical cylinder physical head and logical sector on the disc the error byte is OR ed to give a cumulative report and the occurrence count is incremented 4 56 Measure Seek Time 4 57 Read Spare Table MICRO OPCODE PARAMETERS OF7H 247 physical cyl 2 bytes physical head 1 byte This utility measures the time required to seek from the present location to the physica...

Страница 88: ...of entries The scalar indicates which of the spare tracks on a surface were used when the defective track was spared For example if there are 6 0 through 5 spare tracks per surface and the second spare track was used by this entry then the scalar would be 1 4 58 Locate And Read Full Sector 4 59 Servo Test 4 34 MICRO OPCODE PARAMETERS OCOH 192 physical cylinder physical head physical sector logical...

Страница 89: ...tion MICRO OPCODE PARAMETERS OC8H 200 LOOP 0 255 255 OFFSET XXXXXXXX REPORT XXXXXXXX TEST AREA 0 1 2 3 4 PATTERN SELECT 0 1 2 3 4 5 6 7 8 implies infinite loop SECTOR TRACK CYLINDER SURFACE VOLUME the whole disc change pattern with each loop 39CE7H C30H 30E61CC3987H B8F32E3CCH CCH DB6H 33F94CFE5H random data No l 1essage Option This utility stores the addresses of data errors in the ERT Log Send M...

Страница 90: ...al head 1 byte current logical sector 1 byte error byte 1 byte loop count when error occurred 1 byte format byte sync no data sync or sector overrun error in header field error in data field unrecoverable data error all retries exhausted ECC marginal data error retry marginal data error more than 1 retry required recoverable on the first retry FIFO data lost or track offset invoked The state of th...

Страница 91: ...XXXXXXX TEST AREA 0 1 2 3 4 implies infinite loop SECTOR TRACK CYLINDER SURFACE VOLUME the whole disc No message option This utility will store the addresses of data errors in the ERT Log and fault descriptions Send message option This utility will report data errors to the host as soon as they occur The sector count is updated for each head and is available by reading the ERT log As the name impl...

Страница 92: ...ccurs After reporting the error fault the test may be continued by re sending the ERT command sequence with the loop count set to zero At the end of the test loop count exhausted one byte containing a zero tagged with EOI will be sent to the host 4 63 Random Read Only Error Rate Test Log Option MICRO OPCODE PARAMETERS OCCH LOOP 204 0 255 255 implies infinite loop This routine functions like the Re...

Страница 93: ...ther hand occurs at random intervals and may not always cause a self test failure In the case of a repeatable fault self test will identify the failing FRA with a 95 percent certainty In the event that more than one FRA is lsited as the possible cause of the failure replace the FRA s one at a time in the order given in the self test display NOTE Cable faults an open cable conductor loose cable con...

Страница 94: ... errors media related data bit errors A run log entry will be generated In the Request Status parameter bytes P7 will contain the error code 400 32 20 Data field marginal data error on a read operation 410 33 21 Data field marginal data error correction operation was used to recover the data 420 34 22 Data field uncorrectable data error on read 430 35 23 Marginal Header Failed Although Sector Matc...

Страница 95: ...Timeout 30 seconds waiting for Command Complete during power on 1070 71 47 Illegal ESDI status during power on 1100 72 48 Drive Ready not asserted after Command Complete during power on 1110 73 49 Auto configuration failed probably ESDI communication problem no configuration parameters checked 1130 75 4B Reset attention failed during power on 1140 76 4C Vendor unique status available 1150 77 4D Me...

Страница 96: ...t when formatting a spare track to deallocate it 1520 106 6A Disc Data Controller DOC IC timeout while formatting a track to flag a sector defective 1530 107 68 Disc Data Controller DOC IC timeout while formatting the spare track before the data is written 1540 108 6C Retries exhausted during format track last problem was Disc Data Controller DOC IC timeout 1550 109 60 Retries exhausted during Rea...

Страница 97: ...write error but received another ESDI error instead 2270 151 97 ATN set during read full sector 2300 152 98 ATN set during read defect list 2310 153 99 ESDI command utility failed 2320 154 9A Retries exhausted during format track Track probably did not get formatted 2330 155 9B Retries exhausted during verify initalize No header readable on a track 2340 156 9C Retries exhausted during read headers...

Страница 98: ...ller DDC IC interrupt while reading the defect list 2770 191 BF No Disc Data Controller DOC IC interrupt while reading full sector 3000 192 CO ERT log overflow 3010 193 CI Cannot read disc logs during power up 3030 195 C3 Verify position failed after initialize media cylinder and head in header did not match as expected 3050 197 C5 The Disc Data Controller DOC IC timed out during an ECC correction...

Страница 99: ...gh sector matched on read operation without a Header Fault Seek retried OK Read retried OK 3440 228 E4 Header failed although sector matched for write operation 3450 229 E5 Retry of a Write Fault Offtrack successful 3460 230 E6 Retry of a Write with Offset Aggressive seek on write successful 3560 238 EE Retries required during Format Track 3570 239 EF Retries required during Read Headers Recovery ...

Страница 100: ......

Страница 101: ...2 18 24 GND I FRA2 BROWN 12V RED 2 2 2 ORANGE 3 3 3 YELLOW 4 4 4 I GREEN 5 5 5 BLUE 6 6 6 I VIOLET 7 7 7 GRAY 8 8 8 L WHITE 9 9 9 ESDI INTERFACE CONTROL W3 HEAD SEL3 21 4 1 HEAD SEL2 I WRITE GATE 61 CONFIG STATUS 8 1 I TRANSFER ACK 101 ATTENTION 121 141 HEAD SELO I SECTOR 161 HEAD SELl 181 I INDEX 201 READY 221 241 TRANSFER REO I DRIVE SELl 261 READ DATA 321 341 COMMAND DATA I DGND ALL ODD PINS 1 ...

Страница 102: ... I 1 1 121 141 I 161 181 I 2 1 221 241I I 261 321 34 1 I ALL ODD PINS 1 331 J2 1 1 21 I 31 4 1 I 71 8 1 I 101 111 I 131 141 17 1 I 181 201 I 5 6 9 12 15 16 191 ESDI INTERFACE CONTROL HEAD SEL3 HEAD SEL2 WRITE GATE CONFIG STATUS TRANSFER ACK ATTENTION HEAD SELO SECTOR HEAD SELl INDEX READY TRANSFER REO DRIVE SELl READ DATA COMMAND DATA DGND W2P1 W2 DATA r DRIVE SELECT SECTOR COMMAND COMPLETE AME WR...

Страница 103: ... switch on and off unnecessarily Do not connect or disconnect the HP IB cable assembly s from the disc drive when the system is transferring data on the HP IB This chapter provides removal and replacement procedures for field replaceable assemblies FRA s and parts in the disc drive Procedures are given in the order in which disassembly normally occurs Each part or assembly which must be removed be...

Страница 104: ...958A S7 7A04 5 2 FRONT PANEL PARA 5 5 CEC PARA 5 8 FAN PARA 5 9 PREPARATION FOR SERVICE PARA 5 2 TOP SHROUD PARA 5 4 FRONT PANEL PARA 5 5 1 ROM REMOVAL PARA 5 7 HDA PARA 5 1 1 POWER SUPPLY PARA 5 10 LED CABLE PARA 5 6 TRAY PARA 5 12 ...

Страница 105: ...ws 2 figure 6 1 which secure the top shroud to the disc drive Removal and Replacement 7957A 7958A d Raise the rear of the top shroud upward slightly and then move it backward and away from the disc drive e Ground the frame of the disc drive to the anti static pad Reinstallation is a reversal of the removal procedure 5 5 FRONT PANEL To remove the front panel 3 figure 6 1 from the disc drive proceed...

Страница 106: ... socket on PCA A2 9 See figure 4 6 for the location of U2 Place the ROM on a piece of anti static foam Reinstallation is a reversal of the removal 5 4 procedure ROM is labeled U2 Ensure that the EPROM is installed in its matching 28 pin socket on PCA A2 9 with the index notch on the ROM facing toward the edge of PCA A2 see figure 4 5 5 8 CS80 ESDI CONTROLLER CEC PCA A2 To remove PCA A2 9 figure 6 ...

Страница 107: ...peA A3 To remove PCA A3 21 from the disc drive proceed as follows a Perform the preparation for service procedure outlined in paragraph 5 2 Removal and Replacement 7957A 7958A b Ensure that the power cord is disconnected from the AC LINE connector on the rear panel of the disc drive c Remove the top shroud refer to paragraph 5 4 and the front panel refer to paragraph 5 7 d Disconnect connector PI ...

Страница 108: ... Disconnect connectors P3 and P4 on power cable assembly WI 14 from connectors 13 and 14 respectively on PCA AI 31 f Remove the four T15 screws 33 which secure PCA A 1 31 to the mainframe assembly 35 h Carefully withdraw PCA AI 31 from the mainframe assembly 35 Torque Specification For item 33 screw torque to 15 in lbs with T 15 bit Reinstallation is a reversal of the removal process Ensure that t...

Страница 109: ...SCRIPTION The description of the replaceable part 6 Refer to table 6 2 for an explanation of the abbreviations used in the DESCRIPTION column d MFG CODE The S digit code that denotes a typical manufacturer of a part Refer to table 6 3 for a listing of manufacturers that cor responds to the codes e MFG PART NO The manufacturer s part number for each replaceable part f UNITS PER ASSEMBLY The total q...

Страница 110: ... 32 0 255 Not Assigned X long 0 280 in long 14 07957 60008 ESDI POWER CORD ASSEMBLY W1 15 07957 60005 ESDI CONTROL CABLE ASSEMBLY W3 16 07957 60006 ESDI DATA CABLE ASSEMBLY W2 X 17 07941 60019 FAN 18 19 20 21 22 23 24 25 6 2 07941 00026 0624 0661 1400 0510 09133 67120 0515 0665 5021 1534 0515 0433 2110 0565 Attaching Parts GRILLE fan SCREW tapping pnh T20 10 14 0 625 in long CLAMP cable X POWER SU...

Страница 111: ... pnh T15 0 375 in long 6 32 00000 OBD 4 w scw X 35 5061 3145 MAINFRAME ASSEMBLY 28480 5061 3145 1 Attaching Parts 36 09121 48303 FOOT front 28480 09121 48303 1 37 0403 0427 FOOT rear 94959 SJ 5008 2 38 8160 0280 CONTACT finger 28480 8160 0280 1 X 39 8120 3445 HP I B CABLE ASSEMBLY 1m Model 10833A 28480 8120 3445 1 40 8120 0698 POWER CORD ASSEMBLY NEMA5A CEE 28480 8120 0698 REF 8120 1351 POWER CORD...

Страница 112: ...17 10 X I I I I I I 12 2 I J4 33 I J I 31 33 I J 19 18 l 1 P2 8 I I 32 24 I I 35 I 4 j 37 36 I 34 l 40 J2 25 39 26 22 23 28 29 I 30 J S7957802 ...

Страница 113: ... 24 37 39 35 17 0 I I I I I 36 I 25 26 21 A4 27 4 34 J2 22 J4 P2 32 I 8 6 0 Replaceable Parts 7957A 7958A 4 P1 Disc Drive Exploded View Figure 6 1 6 3 ...

Страница 114: ...ht emitting diode left hand 6 mega 10 megohm 3 mi II i 10 machine medium blow metal oxide manufacturer miscellaneous mi II imetre mounting Mylar 9 nano 10 norma II y el osed number not separately replaceable no time delay order by description outside diameter oval head oxide 12 pico 10 pr i nted c rcuit assembly phillips head pan head part of potentiometer Pozidriv qty rdh rect ref rf rfi rh rpm r...

Страница 115: ... 3 Code List of Manufacturers MANUFACTURER ADDRESS Illinois Tool Works Inc Chicago IL Hewlett Packard Co Palo Alto CA Tracor Littelfuse Inc Des Plaines 3M Co Adhesives Coating St Paul Mn Sea lers Division Replaceahie Parts 7957A 7958A IL 6 5 ...

Страница 116: ...ACKSA Geneve Offices in the World Trade Center JAPAN Yokagawa Hewlett Packard Ltd 29 21 Takaid Higash 3 chrome Suginami Ku Tokyo 168 Tel 03 331 6111 12 86 EASTERN U S A Hewlett Packard Co 4 Choke Cherry Road Rockville MD 20850 Tel 301 258 2000 MIDWESTERN U S A Hewlett Packard Co 5201 Tollview Drive Rolling Meadows IL 60008 Tel 312 255 9800 SOUTHERN U S A Hewlett Packard Co 200 South Park Place Atl...

Страница 117: ...itional pages if necessary Is this manual technically accurate Yes No Are the concepts and wording easy to understand Yes No Is the format of this manual convenient in size arrangement and readability Yes No Comments This form requires no postage stamp if mailed in the U S For locations outside the U S your local com pany representative will ensure that your comments are forwarded FROM Date Name C...

Страница 118: ...Y MAIL FIRST CLASS PERMIT NO 425 BOISE IDAHO POSTAGE WILL BE PAID BY ADDRESSEE Publications Manager HEWLETT PACKARD Disc Memory Division P O Box 39 Boise Idaho 83707 0039 NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES FOLD FOLD ...

Страница 119: ...11111111111111111111111111111111111111111111111111111111111111111 Manual Part Number 07957 90903 Printed in U S A SEPTEMBER 1987 Edition 2 E0987 rli HEWLETT PACKARD ...

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