HP HP 7936 Support Manual Download Page 48

Page: 48 / 249

Summary of Contents for HP 7936

Page 1: ...HEWLETT PACKARD liP 7936 AND HP 7937 DISC DRIVES HARDWARE SUPPORT MANUAL ...

Page 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 Burea u s calibration facilities The Hewlett Packard Quality Program satisfies the require ments of FAR 52 246 15 ...

Page 3: ...90803 Printed JANUARY 1987 Printed in U s A MODELS COVERED Edition 1 E0187 This manual covers the following models HP 7936H 7937H 7936XP 7937XP OPTIONS COVERED In addition to the standard model this manual covers the following options 015 017 r O HEWLETT a PACKARD HEWLETT PACKARD P O Box 39 Boise Idaho 83707 0039 ...

Page 4: ...e prior written consent of HEWLETT PACKARD Company 2 Copyright 1987 by HEWLETT PACKARD FOR U S A ONLY The Federal Communications Commission in 47 CFR 15 818 has specified that the following notice be brought to the attention of the users of this product FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT Warning This equipment generates uses and can radiate radio frequency ene...

Page 5: ...d manual updates Edition 1 JANUARY 1987 Herstellerbescheinigung Hiermit wird bescheinigt daB das Gerat System HP 7936 7937 in Obereinstimmung mit den Bestimmungen von Postverfiigung 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 Manufacturer s De...

Page 6: ...ord 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 s...

Page 7: ... Changes are marked with a vertical bar in the margin If an update is incorporated when an edition is reprinted these bars are removed No information is incorporated into a reprinting unless it appears as a prior update To verify that your manual contains the most current information check that the version printed at the bottom of the page matches the version listed below for that page Effective P...

Page 8: ......

Page 9: ...er 2 Site Planning and Requirements Page 2 1 Introduction 2 1 Site Planning 2 1 Specifications 2 1 Cabling Limitations 2 1 Chapter 3 Installation And Configuration Page 3 1 Introduction 3 1 Shipping Latch 3 1 Drive Installation 3 2 Primary Power Requirements 3 2 Controls Indicators and Connectors 3 2 Line Switch 3 2 Channel Address Diagnostic Switch 3 2 Run Time Mode 3 3 Diagnostic Mode 3 3 LED Di...

Page 10: ...A6 5 8 Servo System 5 11 Head Disc Assembly A3 5 12 Dedicated Servo Code 5 12 Sampled Servo Code 5 13 Servo Head 5 13 Servo Read Preamplifier Write Driver IC 5 13 Drive ID Circuit 5 13 Head Gain Reference PROM and DAC 5 14 Actuator 5 14 Speed Sensor 5 14 Read Write PCA A2 5 14 Dedicated Servo AGC Amplifier 5 14 Sampled Servo Switch 5 15 Sampled Servo AGC Amplifier 5 15 Servo PCA Al 5 15 Servo Cont...

Page 11: ...8 Read Write PCA A2 5 29 Read rrite Controller IC 5 29 Head Select Encoder 5 32 Read Chain 5 32 Write Chain 5 33 Read rrite System Errors 5 33 Error Reporting 5 34 Spindle Drive System 5 34 AC Input ircuit 5 35 Spindle Motor BI 5 35 Primary Power PCA A8 5 35 LINE Switch 5 35 Start Capacitor and Relay 5 35 Brake V oltage Source 5 36 Speed Sensor 5 36 Servo PCA 1 5 36 Read Write PCA A2 5 36 Power Di...

Page 12: ...acement Procedures 6 2 Rear Cover 6 2 HP IB Assembly 6 2 Front Panel 6 3 Front Cover 6 3 Controller PCA A6 6 3 EPROM Kit Controller PCA A6 6 3 Read Write PCA A2 6 4 Servo PCA A I 6 4 Power Distribution PCA A5 6 4 Line Filter AssemblyFL1 6 4 Drive Belt Motor Pulley 6 5 Power Supply PCA A4 6 5 Primary Power PCA A8 6 6 Start Capacitor Cl 6 6 Motor BI 6 7 Head Disc Assembly A3 6 7 Chapter 7 Adjustment...

Page 13: ...g 8 4 Run Time Log 8 4 Fault Log 8 5 Error Codes 8 5 TERRORS 8 6 DERRORS 8 6 Servo Controller Error Codes 8 6 Data Error Troubleshooting 8 7 Checking Power Supply Voltages 8 7 Servo Test Point PCA 8 8 Read Write Test Point PCA 8 8 Chapter 9 Replaceable Parts Page 9 1 Introduction 9 1 Ordering Information 9 1 Service Kit Contents 9 2 Chapter 10 Reference Page 10 1 Controller PCi A6 10 1 Chapter 11 ...

Page 14: ... 80 Instruction Set A 4 ESI A 5 Disc Data Bus A 5 Data Path Control Bus A 6 Servo Control Bus A 7 Miscellaneous Signals A 7 Human Interface A 7 Functional Operation A 7 Power Up A 8 Head Positioning A 8 Write A 8 Read A 9 Error Correction A I0 Hardware Architecture A I0 HP IB Circuitry A I0 HP IB Interface A IO DMA A I0 ESI Circuitry A II Disc Data Interface A II DMA A ii ECC A I2 Data Path Contro...

Page 15: ...ture A I4 Drive Initialization Firmware A I4 Multi Tasking Executive A I6 Channel Module A I6 Command Preprocessor A I7 CS 80 Module A I7 RPS Task A I7 Error Correction Task A I8 Diagnostics A I8 Disc Caching A I8 Cache Functional Operation A I8 Read With Disc Caching A I8 Write With Disc Caching A I9 Cache Flushing A I9 Cache Hardware A I9 Cache Diagnostics A 20 13 ...

Page 16: ... Figure 8 1 ERT Log Error Code Byte 8 9 Figure 8 2 Run Time Log Error Code Byte 8 9 Figure 8 3 Power Supply PCA A4 Outputs 8 10 Figure 8 4 Servo System Test Point PCA 8 40 Figure 8 5 Read Write Test Point PCA 8 45 Figure 9 1 Disc Drive Exploded View 9 7 Figure 9 2 HP 19511A Cabinet Exploded View 9 9 Figure 9 3 HP 19512A Rack Slide Kit Exploded View 9 11 Figure 12 1 Drive Dimensions 12 10 Figure 12...

Page 17: ...lock Diagram A 21 Figure A 4 HP IB Controller PCA A6 Parts Location and Connector Pinout A 23 Table 1 1 Disc Drive Product Structure 1 4 Table 5 1 List of Mnemonics 5 48 Table 8 1 External Exerciser Commands 8 11 Table 8 2 List of DERROR TERRORS 8 15 Table 8 3 Servo System Test Connector Al 3 Mnemonics 8 41 Table 8 4 Read Write System Test Fixture Mnemonics 8 46 Table 9 1 Disc Drive Replaceable Pa...

Page 18: ......

Page 19: ...rerecorded servo code which is used to position the read write heads over the desired data track 1 Head positioning is performed by a rotary actuator and a dual closed loop servo positioning system Control of the servo system is derived from the dedicated servo code on the servo surface and also from servo code embedded between data sectors on all of the data surfaces Mechanical and contamination ...

Page 20: ... serial number should be quoted in any communication with Hewlett Packard regard ing the drive 1 8 SUPPORTED EQUIPMENT This manual is intended to provide the informa tion needed to support service of the drive and all of its accessories and options 1 9 TEST EQUIPMENT REQUIRED No special test equipment is needed for installation and normal maintenance of the drive However when using the special dia...

Page 21: ...I79J7A15 Product Information 7936 and 7937 1 3 ...

Page 22: ... 19511A Desk height Cabinet for up to two 7936 7937 Disc Drives CABINET OPTIONS 208 Adds 07937 60214 Power Tap to HP 19511A Cabinet Designed for environments using NEMA 6 30R power receptacles 208 Vac 60 Hz RACK SLIDE KIT HP 19512A Rack Slide Kit for mounting a 7936 7937 Disc Drive in an EIA 19 inch rack cabinet POWER OPTIONS 015 50 Hz operation 017 180 264 Vac operation UPGRADE KITS HP 97521A HP ...

Page 23: ...mental Requirements for Disc Tape Drives ManHal part no 5944 3456 This publication is supplied with the drive NOTE In order for the drive to operate prop erly it must be operated within the en vironmental specifications given in the above mentioned publication Detailed dimensional specifications for the drive are given in figure 12 1 The dimensions of the HP 19511A Cabinet are shown in figure 12 2...

Page 24: ......

Page 25: ...nstallation of the drive The latch is located behind the rear panel and can be activated by a medium sized flat blade screwdriver through a rectangular opening in the rear panel See figure 3 1 The latch settings are indicated by symbols on the latch visible through the rectangular opening The a symbol is the Ship setting and the I symbol is the Operate setting The latch must remain in the a Ship p...

Page 26: ... is configured for an input of 50 Hz The voltage and frequency for which the drive has been configured at the factory is marked on the LINE label attached to the rear panel of the drive The location of the label is shown in figure 3 2 Make sure that your power source meets the requirements marked on the label Voltage configuration standard option 017 is ac complished within the drive by moving plu...

Page 27: ...he LEDs can still be obtained by commands from the host Refer to Chapter 8 for details Installation And Configuration 7936 and 7937 3 9 DIAGNOSTIC MODE NOTE The DIAGNOSTIC MODE position is for service purposes and should not be used during normal operation of the drive If Sl is set to the DIAGNOSTIC MODE position the same hardware diagnostic executed in RUN TIME MODE is invoked when power is appli...

Page 28: ...O 2110 0030 The line connector allows the drive to be connec ted to an ac power source via a suitable power cord The input power configuration of the drive is listed on the LINE label 3 4 3 14 CPU CONNECTION HP IB SYSTEMS CAUTION Do not connect or disconnect the HP IB cable s from the drive while the system is in active state The interconnection of the drive is dependent on the system configuratio...

Page 29: ...resses The switches can be set with any pointed tool When setting the HP IB address disregard any markings on the switch body Set the switches according to the in Installation And Configuration 7936 and 7937 formation on the Channel Address Diagnostic switch label See figure 3 2 NOTE Before using the drive check the address switches to ensure that no two devices in the system have the same address...

Page 30: ...FACE LINE CONNECTOR FIgure FRONT PANEL a 0 a a 0 0 D aoaao 0 a 0 a a 000 0 a 0 a a a a a a a 0 a a 0 0 a a 0 r acaaocaac a 0 a a 0 0 a a 0 _ _ a 0 a a a 0 a a 0 a a a a 0 0 a a 0 __ aoaaoaaac 1 0 01 a a a a 0 a a a a a a a a 0 a a a a Jcocaooccc REAR PANEL DISPLAY LATCH OVERSHOOT OPENING SHIPPING LATCH OPENING POWER FUSE ...

Page 31: ...ULT 0 READ ITE FAULT 0 SEINe AULT CONTItOLLER AULT FRONT PANEL STATUS LABEL DIAGNOSTIC MODE II 4 6 7 CAUTION MOVE LATCH ONLY WHEN POWER IS OFF DIAGNOSTIC SH IP OPERATE 52 I J II J l II J CI CI CI CI LATCH LABEL 53 IJ I J CI CI IJ I J CI CI 54 II J CI l CI II J CI l CI CHANNEL ADDRESS DIAGNOSTIC SWITCH LABEL LINE LABEL S7t37A34 Rear Pane 0000 0 000 0 L J 0 0000000 0 0000000 0 00000 0 0 0 COCCO 0 0 ...

Page 32: ...of the bus for greater than 10 P IB equivalent loads r UNI T WI TH 7 HP IB EQUIVALENT LOADS HP IB DISC DRIVE 1 HP IB EOUIVALENT LOAD I 1 DISC DRIVE 1 HP IB EOUIVALENT LOAD 1 metre X n loads coble length in metres up to 15 metres maximum MULTIPLE DRIVE INSTALLATION NOTES 1 The maximum number of drives that can be connected to a single HP IB chonnel is host dependent This information is is contained...

Page 33: ...N WARNING The drh e does not contain operator serviceable parts To prevent electrical shock refer all maintenance activities to service trained personnel No preventive maintenance procedures are required to be scheduled for the drive 4 4 1 ...

Page 34: ......

Page 35: ...bution peA AS controller PCA A6 LED PCA A7 and primary power PCA AS Servo PCA AI contains a servo controller phase locked loop PLL and servo timing counters 5 dedicated servo circuit sampled embedded servo circuit and servo power amplifier These circuits provide sector timing information control seeks and maintain the heads on track Read write PCA A2 includes a custom designed read write controlle...

Page 36: ...roller PCA A6 S1 Figure 12 20 Servo System Functional Block Diagram Sheet 1 of 2 S2 Figure 12 20 Servo System Functional Block Diagram Sheet 2 of 2 RW Figure 12 2l Read Write System 5 2 Functional Block Diagram NOTE The numbers which identify the test points in the servo and read write func tional block diagrams are the pin num bers on the read write and servo test PCAs Refer to chapter B for deta...

Page 37: ... sectors with each sector having 256 bytes of data See figure 5 3 In addition to the 256 bytes of data each sector contains a 14 byte sync field a 6 byte header a 2 byte CRC field a 12 byte ECC field a data gap a servo field and a servo code field The 14 byte formatter separator field and the 6 byte header field comprise a 20 byte preamble This information is used for synchronization and addressin...

Page 38: ...Description 7936 and 7937 PHYSICAL LOGICAL S7t37A5J 5 4 INNER DIAMETER MAINTENANCE TRACK INNER SPARES 1399 0004 1395 0000 USER AREA OUTER SPARES OUTER DIAMETER GUARD BAND OUTER DIAMETER MAINTENANCE TRACK resslSng ...

Page 39: ...iption 7936 and 7937 R W TEST AREA FOR POWER ON DIAGNOSTIC 0 20 122 12 3 RUNLOG RESERVED SPARE SECTOR ERTLOG RESERVED FOR FUTURE USE OUTER DIAMETER 0 19 RESERVED FOR FUTURE USE INNER DIAMETER FIgure 5 2 Mamtenance Tracks 20 122 123 SpLE SECTOR R W TEST AREA FOR POWER ON DIAGNOSTIC 0 5 5 ...

Page 40: ...RED SECTOR ON TRACK WILL BE 123 IF NO SECTOR SPARING DONE LOGICAL HEAD ADDRESS PHYSICAL SECTOR ADDRESS TRACK STATUS BIT 7 1 PRIMARY TRACK SPARE O SECONDARY TRACK SPARE BIT 6 1 PRIMARY SECTOR SPAR O SECONDARY SECTOR SPARE LOGICAL CYLINDER ADDRESS MSB LOGICAL CYLINDER ADDRESS LSB READ WRITE DATA CYCLIC REDUNDANCY CHECK ERROR CHECKING INFORMATION ERROR CORRECTION CODE ERROR CHECKING AND CORRECTIONS E...

Page 41: ...e logical track will then be assigned a new physical address one of the spare tracks This sparing action is transparent to the host CPU Functional Description 7936 and 7937 except that the host may note the decision to spare and issue the spare command 5 7 ADDRESSING MODE The drive operates in a cylinder mode to access the data storage areas of the drive In the cylinder mode the heads are position...

Page 42: ...ionship of scalar values to physical spare track locations When performing a track sparing operation the controller first determines the nearest in terms of seek time from the spare pool Then the next sequential scalar in the pool is the track that is used in the spare If the track to be spared resides at logical cylinder 0 697 then the 00 spare pool is 5 8 used scalar number 39 77 If the track is...

Page 43: ...TA HEADS AND 1 SERVO HEAD 0ATA 0 1 2 3 4 5 ROTARY 0 OA CTUATOR 2 3 4 5 6 ROTARY 6 ACTUATOR 7 8 9 10 11 12 TA 1 I J SERVO SURFACE TRACK 0 14 3 I TRACK L403 7936 AND 7937 1396 LOGICAL DATA TRACKS 7936 AND 7937 1 1404 CYLINDERS 1396 FOR DATA r 7936 AND 7937 124 SECTORS PER TRACK SERVO SURFACE 5 9 ...

Page 44: ... I I I I I I I I I I I I I I I I I I I 0 7 14 1 8 15 2 9 16 3 10 17 4 11 18 5 12 19 6 13 20 3 2 1 1398 1397 1396 I I I 39 52 65 40 53 66 41 4 67 42 55 68 43 6 69 44 57 70 45 8 71 46 59 72 47 60 73 48 61 74 49 62 75 50 63 76 51 64 77 I I I I I I I I I I I I 1 1 I I I I I I I I I I I I I 21 28 35 22 29 36 23 30 37 24 31 38 25 32 39 26 33 40 27 34 41 PHYSICAL LOGICAL 00 0 2 3 4 5 7937 6 HEADS 7 8 9 1...

Page 45: ...between cylinders In addition the servo system is responsible for determining the type of HDA being addressed 7936 or 7937 monitoring the spindle speed reporting current servo system status and interpreting incoming commands from controller PCA A6 The servo system makes use of an off the shelf microcomputer integrated circuit servo controller to provide an interface between the servo system and co...

Page 46: ...ponse to a recalibrate command from con troller PCA A6 the servo controller a moves the heads starting from an unknown velocity and position to the outer guard band b controls the lock up of the servo PLL c stops the actuator arm against the crash stop d settles on a track in 5 12 the guard band e seeks out of the guard band until track 0 is detected f enables Start of Sector SOS L to the drive el...

Page 47: ...pled servo code the servo head is track following on the quad dibits therefore the sampled servo code is physically Functional Description 7936 and 7937 offset 1 2 track from the center of the adjacent data track see figure 5 13 When reading the sampled servo code the data head is physically lo cated midway between the two odd and even sampled servo code patterns This allows the head to detect dib...

Page 48: ...n ball bearings A bobbin type voice coil attached to the rotary arm and mounted between two fixed permanent magnets comprise a head 5 14 positioning mechanism actuator The actuator provides the driving force needed to move the arm for positioning the heads over the discs The mag netic field in the gap between the two magnets al lows acceleration of the moving arm to be control led by the current i...

Page 49: ...to complete these commands and returns servo status informa tion to the microprocessor All communication with controller PCA A6 is via the Servo Control Bus 5 28 Controller Intercommunication Either con troller the microprocessor in PCA A6 or the servo controller is capable of initiating communication to the other at any time To arbitrate such an in terface a dual first in first out FIFO register ...

Page 50: ...rvo Gate Track Crossing Signal SPOSNS L is from the spindle drive system see figure iD and the remainder of the signals are from components of the servo system see figures II and II ACQUIRE H AMPEN H CLER L CLSER L FSEN L GOBEN H LCK L LSB H NACC L PACC L QUAO H SCAP L SOSEN H SSSL H OUTPUTS Acquire Amplifier Enable Clear Error Clear Servo Error Fine Servo Enable Guard Band Enable Lock Least Signi...

Page 51: ...etector and a 16 bit shift register The basic timing for the servo mark decoder is generated by the dedicated servo timing circuit Functional Description 7936 and 7937 When the servo head is over the data area the sec tor mark decoder is searching for a sector mark The absence of both in phase dibits within a cell defines a sector mark zero The Dibit Gate DBGT H signal gates the in phase dibits in...

Page 52: ...icated servo AGC in tegrator to generate the proper AGC level 5 18 5 39 Dedicated Servo Timing And PLL This block generates the reference timing signals for servo and write operations The PLL circuit generates the 28 2 MHz Differential Write Clock DWC L OWC H used when writing data on the disc The PLL includes a VCO which through the use of a phase detector is synchronized to DSVRP In addition the...

Page 53: ...937 sector counter The counter outputs serve as address lines for the timing PROM which generates the sampled servo timing signals The WC H signal from the dedicated servo timing and SMDT H from the sector mark decoder serve as timing reference inputs to_the PALs synchroniz ing the sampled servo timing with the dedicated servo The SSRVN signal from the sampled servo amplifier is input to a compara...

Page 54: ...the sum of the two inputs SLVL represents the level of the sampled servo signal and is used by the sampled servo AGC integrator to generate the proper AGC level 5 20 5 45 SAMPLED DEDICATED SELECr SWITCH The sampled dedicated select switch selects either Sampled Servo Position Error signal SPOS or Dedicated Servo Position Error signal DPOS for connection to the input of the servo power amplifier vi...

Page 55: ...to the difference between the input signal and the sensed current with the frequency effects from the compensator Functional Description 7936 and 7937 The error signal from the amplifier compensation circuit is input to the pulse width modulator PWM block Here the error signal is converted into a lOO kHz pulse width modulated TTL square wave labeled Pulse Width Modulation PWM L The square wave is ...

Page 56: ... to a filter within the seek current command generator limits the rate of change of the signal input to the amplifier 5 22 Three notch filters in the circuit compensate for mechanical resonances in the drive Since these resonances can be excited by either the signal derived from Slew Position Error SLPES or the seek command current generator output both sig nals are routed through the notch filter...

Page 57: ... shut off Functional Description 7936 and 7937 5 60 Transistor Drivers The transistor driver stages change the PWM L output from the pulse width modulator into signals which drive the gates of the output transistors The drivers have an op tical isolator at their inputs which translates the TTL input signal into a signal which switches rela tive to the 45V supply Slow turn on and fast turn off circ...

Page 58: ...forced to turn off the P channel FET All of these functions operate even when any of the 5V 5 2V 12V or 12V supplies are at zero volts The actuator crowbar circuit 5 24 requires that the 45V supply to be about lOY in order to operate and the output FETs will remain turned off for any value of either the 45V or 45V supplies 5 66 Actuator Crowbar The actuator crowbar circuit is activated if a fault ...

Page 59: ... data write whereas others are detected in the servo controller and are communicated only to controller PCA A6 Functional Description 7936 and 7937 The occurrence of most of the errors will cause the servo controller to jump to an abort routine In this routine various servo protect routines will be taken depending on the severity of the error The severity of the error is indicated by the immediate...

Page 60: ...a final deceleration current pulse is sent to the actuator and the sampled servo circuit is enabled When the PES signal passes through track center for the first time a seek near 5 26 complete is sent to the controller At the same time a counter in the servo controller begins to count the number of times OFTRK indicates that the heads have moved from being on track to off track If this count excee...

Page 61: ...rom the microprocessor in controller PCA A6 passed over the Data Path Control bus transforms byte parallel data to or from the DMA ECC electronics in PCA A6 passed over the Disc Data Bus and obtains timing information from the servo system Read and write operations are commanded on a sector by sector basis and the operation for every sector is completely independent When not reading a sec tor or w...

Page 62: ...connected at a common point and 5 28 phased in such a way that the common point acts as a center tap These windings are used for both reading and writing by detecting or producing a magnetic field at the gap in the ferrite core In a write operation data is written by passing a current through the windings of the selected head The current generates a flux field across the gap and aligns the magneti...

Page 63: ...n and an encoder decoder section The control section receives commands and exchanges status information with the micro processor in controller PCA A6 over the Data Path Control Bus The encoder decoder section Functional Description 7936 and 7937 exchanges disc data with the DMA ECC electronics in PCA A6 via the Disc Data Bus receives timing information from the servo system and interfaces with the...

Page 64: ...end of the data field Write Holdoff WHO L can be asserted by the DMA to inhibit a write sector If asserted prior to the falling edge of SOS L it will override a com mand from the controller and no read or write will take place 5 30 5 94 Servo Signals The read write controller receives the following signals from the servo system SOS L WCLK L SVER L Start of Sector Write Clock Servo Error 5 95 Read ...

Page 65: ...oding scheme used in the encoder decoder section of the read write controller is called variable length frequency modulation VLFM This scheme Functional Description 7936 and 7937 produces l 33 bits per flux reversal The code algorithm is shown below DATA PATTERN TRANSITION PATTERN 00 X01 01 010 10 X10 1100 010001 1101 XOOOOO 1110 XOOO01 1111 010000 x 1 if followed by 0 otherwise 0 The code is stru...

Page 66: ...s CHIPO H through CHIP3 H and HS1 H HS2 H from the read write controller to select the proper heads The head select encoder outputs are labeled Chip 5 32 Enable CEO L through CE3 L and Head Select HS1 L HS2 L Two additional outputs labeled Channel 0 1 CHO H CH1 H together with HOS1 H HOS2 H are used to address the head gain reference PROM in the HDA This circuit is discussed in the servo system fu...

Page 67: ...ock source and outputs a signal proportional to their difference The controller clock source advances maintains or delays the phase of the output clock as commanded by a plus zero or minus input signal The outputs from the Functional Description 7936 and 7937 PLL and data separator are are labeled Read Data RDATA and Read Clock ROCLK Both signals are fed to the encoder decoder section of the read ...

Page 68: ... probably dropout The error is used primarily for defect location in media test Read is not disabled until the next sector Interrupt is asserted at the end of the sector in which the 5 34 error occurred Interrupt and the status register can be cleared by a clear command to the status register This action occurs if the bit mask is not set 5 112 Servo Error During a Read with Mask Set This error ind...

Page 69: ... in corporated in the motor provides overload protection Functional Description 7936 and 7937 A brake mounted on the shaft of the motor brings the motor to a rapid halt when ac power is removed from the drive 5 11S PRIMARY POWER peA AS The principal function of primary power PCA A8 is to facilitate the changeover of the spindle motor windings and the input of the brake voltage source when the driv...

Page 70: ... POWER DISTRIBUTION PCA A5 Power distribution PCA AS receives Speed Sense SPDSNS L from the speed sensor via Speed sen sor cable WS and routes the signal to servo con troller PCA A1 via signal jumper cable W7 and read write PCA A2 PCA AS also supplies SV to the speed sensor via cable WS Signal Start Capacitor SCAP L from servo PCA AI is routed through PCA AS to the start relay in primary power PCA...

Page 71: ...per voltage Functional Description 7936 and 7937 appears at the output of a full wave rectifier when the 5 Vdc output is correct Each supply also has a LC filter to smooth the rectifier output 5 133 FAULT DETECTION AND PROTECTION The power supply can detect overcurrent and overvoltage conditions on all out puts When either condition occurs the primary is turned off and the supply shuts down After ...

Page 72: ... gases and moisture from the incoming air This is to prevent corrosion from occurring on the thin film surfaces of the discs 5 38 5 139 RECIRCULATING FILTER The recirculating filter is a 60 percent O 3 micron filter The circular shape of the HDA cover and the rotational speed of the discs cause the inlet of the filter to be pressurized This results in the filtration of approximately seven to eight...

Page 73: ... DISABLE INTERRUPTS INITIALIZE PORTS FSEN SSSL QUAD P NACC LSB DIV5 SCAP CBDEN SOSEN AMPEN LCK O ABRT SFLEN AQUIRE l ABORT SCAP LCK 1 SET A 13S T O 3000 SCAP 0 STATUS 0 QSTAT 1 PONST 1 IDLE Functional Description 7936 and 7937 ON 1 NO FIgure 5 Servo Controller Power On Flowchart Sheet 1 of 5 39 ...

Page 74: ...ET STACK POINTER ENABLE INTERRUPTS DISABLE INTERRUPTS OPCODE 0 UNSOLICITED REPORT QSTAT 1 STATUS BIT ARRAY see note fSEN SOSEN 0 QUAD ABORT PONST 1 COAST OUTPUT 2 BYTE MESSAGE ByTE 1 OPCODE QSTAT BYTE 2 STATUS HOLDOff 1 aSTAT 0 STATUS 0 HOLDOff 1 REPORT STATUS SEE If STE STE CLEARS AND REMAINS CLEAR fOR 2ms NOTE BIT ARRAY BIT I SPIN_8 7 SPIN_L 6 SPIN_H 5 STE 4 OFTF 3 LCK_8 2 AGCF 1 AMPF O S7tJ7A75...

Page 75: ...R BY STABILITY OF OBDH ADD DEBOUNCE PULSES AS NEEDED WHEN GBDH IS TRUE MONITOR ACTUATOR STABILITY BY TRACK CROSSING RATE DEBOUNCE AS NEEDED SPINH L TOGGLE LSB t WAIT fOR SETTLING GBDEN CHECK SPDH SPDL 0 IR O CALL BUMP SEEK SEEK 2 UNTIL STE O OR 50 BUMP SEEKS HAVE BEEN DONE BUMP SEEK DIR l BUMP SEEK DIR 0 fAIL IF STE DIDN T APPEAR AND GO AWAY IN RESPECTHVE ORDER WITH THESE SEEKS YES AQUIR WAIT 1 SE...

Page 76: ...E IF DTO 611 SEEK T O 4Oms LAST ACCEL TRK ___ OTO 281 IF OTO 21 TO 611 SEEK T 0 3Oms s LAST ACCEL TRK OTO 2 SET A 2ms T 0 FOR FIRST TRACK CROSS INO ___ 0 IV5 0 1 STATUS 26 0IV5 OUAD l START SEEK TIMER LOAOI START TRACK COUNTER WAI T f OR oro LAST ACEL TRK IF ORIOINAL OTO WAS 768 HOLD VELOCITY AT 65500 TIS UNTIL DTO 367 COAST UNT IL OTO 325 DECELERATE WAI T FOR OTO 256 01v5 0 IF OTO 35 NO Figure 5 ...

Page 77: ...ET UP TRACK COUNTER WAIT F OR ACCELT O CALCULATE INITIAL DECELERATION DUTY CYCLE BASED ON DTG SET COMMANDED OUAD VALUE APPLY ONE 90ul PULSE TC UNTIL MEASURE TRACK CROSSING TIMES AND COMPARE VALUE TO A TABLE INDEXED BY DTG COAST IF GOING TOO SLOW ADO A DECELERATION PULSE IF GOING TOO F AST DUTY CYCLE OF THE PULSE IS A CALCULATED VALUE DIVS O WHEN DTG 21 CONTINUE UNTIL DTG 1 YES STATUS 11 COAST STOP...

Page 78: ...OAST 768us oECEL 70us SETTLE J t STOP TC COUNTER ____ FSEN 1 ACQUIR O SET 3m T 0 ONCE OFTF O MAKE SURE I T IS STABLE FOR AT LEAST 670us IF SSS 1 ALSO LOOK FOR AGCF AND STE YES 4 QSTAT 1 STATUS 21 MASK IF SSS O STE STATUS J RETURN STATUS 6 ABORT S7tJ7 e Figure 5 9 Bump Seek Flowe art 5 44 ...

Page 79: ...RETURN BIT ARRAY REPORT SEEK TIME 10H LAST SEEK TIME IN uS REPORT PRESENT TRACK 14H PIN TO CRASH STOP 18H BIT 0 DIR BIT 1 LCK FSEN 0 QUAD DUTY CYCLE 24uS ON 12 us OFF FOREVER REPORT SPINDLE SPEED 20H OF uS 4 SECTORS ALTERNATE SEEKS 24H RANDOM SEEKS 28H REPORT HDA TYPE 30H RETURNED IN SIT 0 AND REPORT LAST VELOCITY 2CH BUTTERFLY SEEKS 34H HEAD GAIN TEST 38H BIT 0 DIR ACCEL FOR SOOuS COAST FOR 40uS ...

Page 80: ...L T CLASS D IAGNOST IC DRIVE STATE UNSOLICITED REPORT SCHEDULE ALL TASKS TEST ABI DMA 1 0 FAIL H2BH TEST DATA PATH DMA TO FROM HOST INTERFACE FAIL H1DH REPORT SERVO STATUS MASKING ALL BUT SPINDLE FAULTS WAIT DELAY SEEK T O 15s WAIT SEEK T O REPORT RECEIVED SERVO FAULT CLEAR FAULT SEEK TO TARGET UNTIL ALL 66 ENTRIES IN SERVO FREE SEEK TEST TABLE USED OR THERE IS A LOAD SOSL_TEST VECTOR IN INTERRUPT...

Page 81: ... THEN READ IT BACK NO REPA IR THE BLOWN AWAY SECTOR __ SET WHOH ON THE DNA THEN SE T A WR ITE FROM THE DMA EXECUTION BUFFER F AIL 20H F AIL 21H WRI TE PROTECT _________ YE S c FAIL 22H THE TEST SHOULD SET WRI TE PROTECT __ NO BEGIN RECOVERING THE SPARE TABLE IF ANY HEADER CYLINDER VALUE IS THE PHYSICAL OF CYLINDERS 1410 OR IF NONE OF THE SECTORS ON ANY TRACK WERE vERIFIABLE FAIL I17H RESET SEEK CO...

Page 82: ...ILTER and AMPLIFIER stage AGC INTEGRATOR output to SERVO CONTROLLER AGCF L is active when level of sampled servo is too far above or below a reference AGCF L can be monitored at pin 40 of the servo test point PCA SERVO CONTROLLER output to AMPLIFIER CONTROL and FAULT INDICATION circuit See figure The servo power amplifier is off when AMPEN H is low and is turned on by the rising edge of AMPEN H as...

Page 83: ...s an address line to the HEAD GAIN REFERENCE PROM in HDA A3 BSOS L switches the head gain PROM ad dress from read write heads to servo head BSOS L is connected to the PROM in HDA A3 via HDA cable WS HEAD SELECT ENCODER outputs which together with Head Select bits HS1 H HS2 H are decoded by the READ PREAMP WRITE DRIVER ICs to select the desired read write head CEO L thru CE3 L are connected to the ...

Page 84: ...tor Dedicated servo AGC INTEGRATOR analog voltage output which controls the gain of the DEDICATED SERVO AGC AMPLIFIER DAGC can be monitored at pin 46 of the ser vo test point PCA DAGC is connected to the DEDICATED SERVO AGC AMPLIFIER in read write PCA A2 See figure 1iDI 6 25V reference for the DAC in HDA A3 Part of head gain reference circuit DAR is connected to the DAC in HDA A3 via read write PC...

Page 85: ...output The amplifier input is differential Servo Data SOX SOY from the SERVO READ PREAMp WRITE DRIVER IC OEOP and DEON are connected to the input of the DEDICATED SERVO FILTER in ser vo PCA AI See figure fill DRIVE 10 outputs to SERVO CONTROLLER Signals identify the HDA type 7936 or 7937 When requested the SERVO CONTROLLER reports this informa tion to controller PCA A6 DIDO 0101 are connected to t...

Page 86: ...hich carries data path control commands and status information Signals which control addressing and hand shaking are Data Path Read High Write Low OPRHW L Data Path Address Zero OPAO H Data Path Control Select OPCS L and Data Path Interrupt Request OPIRQ L DPCO thru DPC7 are connected between the DATA PATH CONTROL INTERFACE in controller PCA A6 and the READ WRITE CONTROLLER in read write PCA A2 vi...

Page 87: ...can be monitored at pin 6 of the read write test point PCA OPI RQ L is connected to controller PCA A6 via connectors A2J1 and A6P1 Dedicated servo POSITION DEMODULATOR output OP S is dedicated servo code A dibits minus dedicated servo code B dibits OP S can be monitored at pin 47 of the ser vo test point PCA Data Path Control Bus handshake line from the DATA PATH CONTROL INTERFACE The low state en...

Page 88: ...nnected to the SECTOR MARK DECODER and the DEDICATED SERVO TIMING and PLL Measurement point for OSRVP OSRVPT can be monitored at pin 13 of the servo test point PCA DEDICATED SERVO TIMING AND PLL differential output to read write PCA A2 This signal which becomes single ended Write Clock WCLK L in PCA A2 is the write clock used by the read write controller OWC L and OWC H are connected to a buff er ...

Page 89: ...H to create DSOS L DSOS H GAP L is the complete window for the sampled servo code GAP L can be monitored at pin 26 of the servo test point PCA DEDICATED SERVO TIMING output to SERVO CONTROLLER GBD H is activated when the guard band mark is detected by the sector mark decoder The signal is used during calibration to indicate when the heads are on the guard band SERVO CONTROLLER output to DEDICATED ...

Page 90: ...re connected to the PROM in HDA A3 via HDA cable W8 HS1 H HS2 H Head Select IDII A2 HEAD SELECT ENCODER outputs which together with Chip Enable bits CEO L through CE3 L are decoded by the READ PREAMP WRITE DRIVER ICs to select the desired read write head bits 1 2 INDEX H Index LCK L Lock 5 56 IJA1 IJA1 HS1 H and HS2 H are connected to the READ PREAMP WRITE DRIVER ICs in HDA A3 via HDA cable W8 SAM...

Page 91: ...plifier OUTPUT FILTER lines which supply drive current to the ac tuator voice coil MOTOR and MOTOR are connected to the ACTUATOR in HDA A3 via read write PCA A2 and HDA cable WS SERVO CONTROLLER output to SEEK CURRENT COMMAND GENERATOR See figure NACC L causes the servo power amplifier to drive the actuator with 2 90 amperes Output from MISSING PWM CLOCK DETECTOR NO CLK H signals to the amplifier ...

Page 92: ...L signals to the amplifier CONTROL AND FAULT INDICATION cir cuit that the actuator is moving too fast SERVO CONTROLLER output to SEEK CURRENT COMMAND GENERATOR See figure SIi PACC L causes the servo power amplifier to drive the actuator with 2 90 amperes READ WRITE CONTROLLER output which enables the PARITY ERROR DETECTOR in the read chain PARITY DETECTOR output which informs the READ WRITE CONTRO...

Page 93: ...read write PCA A2 POWER FAIL RESET output used to reset circuits in the drive at power on POR L goes high a minimum of 100 milliseconds af ter all output voltages from the power supply are in regulation following application of primary power to the power supply During operation of the drive POR L will go low when any output voltage from the power supply loses regulation POR L is connected to PCAs ...

Page 94: ...the encoder decoder section of the READ WRITE CONTROLLER Read data clock from the read chain PLL and DATA SEPARTOR RDCLK H is input to the encoder decoder section of the READ WRITE CONTROLLER An output from the encoder decoder section of the READ WRITE CONTROLLER to the PLL and DATA SEPARATOR RDEN H changes the PLL from a frequency mode to a phase mode when a read begins RDEN H can be monitored at...

Page 95: ... INTERFACE When ac tive SBF L indicates that controller PCA A6 cannot accept any more status bytes from the SERVO CONTROLLER SBF L is connected to CONTROLLER in servo read write PCA A2 the SERVO PCA AI via SERVO CONTROLLER output to spindle system SCAP L controls a relay which con nects a start capacitor in parallel with the spindle motor run capacitor at power on SCAP L is connected to the start ...

Page 96: ...messages are two bytes in length so it requires two operations to complete a message These transfer operations are fully handshaked by four lines associated with the bus These lines are Servo Read SRO L Servo Write SWR L Servo Data Available SOAV L and Servo Buffer Full SBF L SOO thru S07 are connected between con troller PCA A6 and servo PCA AI via read write PCA A2 READ WRITE CONTROLLER Disc Dat...

Page 97: ...here after is always low SHS H is connected to the SERVO READ PREAMP WRITE DRIVER IC in HDA A3 via HDA cable WB Output from SLEW RATE LIMIT switch to POSITION LOOP COMPENSATION block See iii The switch is controlled by OFTU L SLPES can be monitored at pin 17 of the servo test point PCA Sampled servo POSITION DEMODULATOR output to the AGC INTEGRATOR SLVL represents the addition of the sampled servo...

Page 98: ...etermine the beginning and end of the writeable data field The signal is used in the write chain as a Disc Data Bus handshake line The controller uses SOS L to initiate a data transfer across the bus Since SOS L is generated not only for sectors which will be transferred but for all sectors the controller also uses SOS L to count sectors and keep track of rotational position SOS L can be monitored...

Page 99: ...stem SPR L is connected to the SERVO CONTROLLER and the SERVO POWER AMPLIFIER in servo PCA AI via read write PCA A2 SERVO CONTROLLER Servo Control Bus handshake line to SERVO CONTROL INTERFACE in controller PCA A6 When active SRD L enables controller PCA A6 to drive the bus with a byte of command information SRD L is connected to controller PCA A6 via read write PCA A2 FAULT LATCHES output to SERV...

Page 100: ...TCH This switch al lows only the sampled servo information prerecorded between data sectors to reach the SAMPLED SERVO AMPLIFIER See SMPN SMPP SSEN L and SSEN H are connected to the SAMPLED SERVO SWITCH in read write PCA A2 See figure SAMPLED SERVO TIMING output to POSITION DEMODULATOR and SERVO CONTROLLER SSGT L is a window of the sampled servo code dibits SSGT L can be monitored at pin 34 of the...

Page 101: ...the SERVO CONTROLLER is driving the bus with a byte of status information SWR L is connected to controller PCA A6 via read write PVA A2 AMPLIFIER CONTROL and FAULT INDICATION output SWON L controls the input signals to the servo power amplifier in put stages WRITE CHAIN output which selects the operating mode of the SERVO PREAMP WRITE DRIVER IC SWS is low when read is selected and approx 3 5V when...

Page 102: ...H can be monitored at pin 50 of the servo test point PCA Output from UNDERVOLTAGE DETECTOR UNDER VLT L signals to the servo power amplifier CONTROL AND FAULT INDICATION circuit that a failure has occurred in either the 45V or 45V sup ply to the amplifier READ PREAMP WRITE DRIVER IC out put line in which current flows whenever writing is enabled and there is an absence of write current or data tran...

Page 103: ...encoded data in NRZ form clocked by the write clock supplied by the servo system A negative transition of WDATA H maps to a transition on the mag netic media WDATA H can be monitored at pin 12 of the read write test point PCA READ WRITE CONTROLLER output to WRITE CHAIN WGTO L is clocked true low by the the falling edge of Start of Sector SOS L when a write command has previously been entered into ...

Page 104: ...a connectors A6P1 and A2J 1 WRITE CHAIN outputs which select the operating mode of the READ PREAMP WRITE DRIVER ICs in HDA A3 Signals are low when read is selected and ap prox 15V when write is selected WSA and WSB are connected to the READ PREAMP WRITE DRIVER ICs in HDA A3 via HDA cable WB LED DRIVER output to yellow LED in front panel LED display YLEO is connected to LED PCA A7 via read write PC...

Page 105: ...IV EH A E ON I AN INDEX MARK IS ENCODED IN THE FIRST SECTOR OF THE DATA AREA CODE THE INDEX MARK CONSISTS OF A REPEAT SECTOR MARK STARTING IN CELL 40 AND ENDING IN CELL 55 A PHASES QUAD PHASES ARE USED FOR SAMPLED SERVO WRITING AND SEEKING Figure 5 12 Dedicated Servo Code 5 71 ...

Page 106: ...UST CAUSE A POSITIVE TO NEGATIVE VOLTAGE CHANGE ON THE DISIT SIGNAL I I 48WC I TYP 4 PLCS I t 1 2 TRACK l I I NOTE 1 WC WRITE CLOCK 78 ns 0 3600 RPM t 1 2 TRACK I I GAP L EVEN TRACK DI81T SIGNAL DATA TRACK CENTER ODD TRACK DI81T SIGNAL EVEN TRACK TRANSITION PATTERN ODD TRACK TRANSITION PATTERN Figure 5 13 Sampled Servo Code 5 73 ...

Page 107: ...GUARD BAND SERVO CODE TIMING u u ur j u u u 1 v u 1 v Functional Description 7936 and 7937 f V v L L f f f f f f 1 0 f 0 n 0 f 0 n 0 f 0 nOn 0 non 0 1 1 0 v v j v j 1 j 1 j V j 1 V v jv v 1 j 1 v 1 j V v 1 V J V V VV v J j V 1 f f A f 0 f f 1 0 non f f f 1 f v j v v v v V v j GUARD BAND DETECT r I ________________________________ I IL_______________________________ ____ r__lL______________________...

Page 108: ...R MARK DETECT SAMPLED SERVO ENABLE SAMPLED SERVO GATE LJ Functional Description 7936 and 7937 __ S_A_M_P_LE_D __S_E_R_V_O_ __ PO_S __ IT_I_V_E______ ___________________________________________________________________ SAMPLED SERVO Figure 5 15 Sampled Servo Circuit Timing 5 77 ...

Page 109: ...ION peA A5 I DC POWER SUPPLIES 1 1 1 1 45V 12V 5V 5 2V I POWER ON RESET AND POWER ON RESET POWER FAIL CKTS o DC AC POWER 1 8R _KE_ _ M_O OR I L FAIL CKTS J L ____oj INTERFACE CONTROL BUS I TO ALL CIRCUITS STANDARD CHANNEL INTERFACE ADDRESS ESI DIAGNOSTIC SWITCHES vo PCA A1 I SERVO PLL AND SERVO C NTROLLER TIMING I 1 SERVO POWER AMP POSITION ERROR SWITCH ACTUATOR DRIVE L _ r DISC DATA BU I DATA PAT...

Page 110: ...VLFM I PLL r DATA READ I CHAIN SEPARATOR WRITE CLOCK SAMPLED SERVO SAMPLED SERVO AGC AGC AMPLIFIER HEAD GAIN REF DEDICATED SERVO DEDICATED SERVO AGC AGC AMPLIFIER L _ _ J r r Functional Description 7936 and 7937 r I HEAD DISC ASSY A3 I I I I I I I I I I HEAD GAIN REF HEAD GAIN HEAD REFERENCE ADDRESS PROM DAC I HEAD SELECT READ READ WRITE PREAMP WRITE DATA VLFM AND SERVO DRIVER ICs CODE RjW HEAD I ...

Page 111: ...is in an active state This chapter contains removal and replacement procedures for field replaceable assemblies and parts in the drive Also provided are a list of tools required illustrations available and instructions on how to prepare the drive for service The removal and replacement procedures are given in the order in which disassembly normally occurs Thus each assembly or part needed to be re...

Page 112: ...e Shipping Latch to the a Ship position Refer to chapter 3 for details d Disconnect the HP IB cable from the drive in terface connector 6 5 DRIVE REMOVAL AND REPLACEMENT PROCEDURES Removal and replacement procedures for field replaceable assemblies and parts in the drive are provided in the following paragraphs Unless 6 2 otherwise specified replacement is a reversal of the removal procedure NOTE ...

Page 113: ...and 7937 CONTROLLER PCA A6 To remove controller PCA A6 9 figure 9 1 proceed as follows a Remove the rear cover refer to paragraph 6 6 and the HP IB assembly refer to paragraph 6 7 from the drive b Remove power jumper cable W6 5 and signal jumper cable W7 6 from the drive c Disconnect connector P2 on BDA cable W8 7 from connector J7 on read write PCA A2 16 d While holding cable W8 7 out of the way ...

Page 114: ... cable WI 87 from connector Jl on filter FLI 24 e Remove the four TIS screws 20 and four T10 screws 21 which secure the rear panel 22 to the drive NOTE The three TIS screws which secure the line filter 24 to the rear panel need not be removed procedure f Remove the rear panel 22 from the drive 6 13 SERVO PCA Al To remove servo PCA Al 11 proceed as follows a Remove read write PCA A2 from the drive ...

Page 115: ...over 79 by loosening the TIO mount ing screw 68 e Remove the 1 2 inch nut 56 which secures the Removal And Replacement 7936 and 7937 belt guard 57 and motor pulley 58 to the motor 74 shaft Hold the fan rotor 71 to keep the shaft from turning while removing the nut f Remove the belt guard 57 drive belt 55 and motor pulley 58 from the motor 74 shaft CAUTION When the top cover 66 is reinstalled make ...

Page 116: ... connector J3 on PCA AS 61 d Disconnect connector P5 on power supply out put cable W4 SS from conllector J5 on PCA AS 61 6 6 e Disconnect connector P2 on power supply in put cable W3 59 from connector J7 on PCA AS 61 f Disconnect connector B1P2 on the motor B1 74 power cable from connector J I J2 on PCA AS 61 g Detach power supply input cable W3 59 from the cable retainer on PCA AS 61 h Partially ...

Page 117: ...f the drive ICAUTION I Ensure that the motor 74 power con nector is plugged into the proper voltage configuration connector JI 115V for 90 132 Vac J2 240V for IS0 264 Vac Removal And Replacement 7936 and 7937 on PCA AS 60 CAUTION When the fan scroll 73 is reinstalled ensure that the PCA guide on the scroll fits between the edge of primary power PCA AS 60 and its plastic base plate ICAUTION I When ...

Page 118: ...t is resting on its side and the spindle lock is accessible 6 8 Identify the type of spindle lock installed on the HDA see figures 6 1 and 6 2 i To remove a spring type spindle lock figure 6 1 push down on the lock and disengage it from the base plate Remove the lock and in stall it on the old HDA j To remove a bracket type spindle lock see figure 6 2 proceed as follows 1 On the new HDA remove the...

Page 119: ...PUSH HERE TO REMOVE SPRING TYPE SPINDLE LOCK S7t37A89 SPINDLE PULLEY S7tJ7A48 BRACKET TYPE SPINDLE LOCK FIgure o Removal And Replacement 7936 and 7937 o T15 MOUNTING SCREWS 6 9 ...

Page 120: ......

Page 121: ...Adjustments 7 1 INTRODUCTION WARNING The drive does not contain operator serviceable parts To prevent electrical shock refer all maintenance procedures to service trained personnel 7 7 1 ...

Page 122: ......

Page 123: ...ESHOOTING STRATEGY The drive is designed to be repaired quickly on site by the replacement of field replaceable assemblies To aid in diagnosing drive malfunctions several important service tools are available The first of these is the self test diagnostic routine which is in itiated each time the drive is powered on Hardware malfunctions discovered during the self test diagnostics are identified b...

Page 124: ...tinguished The coding for the LEOs is shown on a label on the rear panel See figure 3 2 8 2 NOTE A drive fault condition Red LED il luminated does not necessarily mean that the controller is incapable of com munication with the host In most cases details of the fault condition over and above the information encoded by the LEDs can still be obtained by using the external exerciser to retrieve statu...

Page 125: ... 7936 and 7937 cabling fault cable assemblies WI through W8 Check that the cable con nectors are properly seated in their rnating connectors before considering the replacement of a PCA The follow ing cables are associated with faults in dicated by the LEOs FAULT Power Supply Motor Read Write Servo CABLE W 1 W3 W4 W6 Motor B1 cables W8 WS W7 W8 3 A portion of the servo system cir cuitry is located ...

Page 126: ...during the ERT If there were multiple errors on the same sector the information in the Error Code Byte represents all the errors that oc curred The counters in the log header are incre mented for each error Each data error entry includes the following 8 4 information Logical address cylinder head and sector of the error Error Code Byte This byte is defined in figure 8 1 Error type Occurrence count...

Page 127: ...disc maintenance tracks The disc fault log can hold a maximum of 44 log entries The drive returns both RAM and disc entries when the fault log is read therefore a total of 74 fault log entries can be returned Each entry in the log contains the following information Troubleshooting and Diagnostics 7936 and 7937 Current address cylinder head and sector This is the last address at which the servo sys...

Page 128: ...ich may be returned as TERRORS If no assembly is indicated the drive is unable to accurately isolate the malfunctioning hardware FRU code 0 TERRORs are also logged in the fault log however the accompanying FRU code is not recorded It should be understood that the FRU numbers do not necessarily correspond to the drive assembly 8 6 numbers documented in this manual The following matrix shows the rel...

Page 129: ...tor s The results of this test should then be compared with the first log entries to determine if the error is hard soft or gone If the error is hard there may be a media defect that should be spared The only way to determine this is to perform a a Write Then Read Error Rate Test WTR ERT on the suspect sector s If the sector s being tested contains important data then care should be taken to back ...

Page 130: ...wn in figure 9 1 item 81 d Plug the servo test point PCA into the 50 pin connector on PCA AI visible through the 8 8 opening in the top of the drive The mnemonics used in figure 8 4 to identify the test PCA signals are described in table 8 3 The test points are identified by number in the servo system functional diagrams II and II in chapter 12 8 22 READfWRITE TEST POINT PCA Read write test point ...

Page 131: ... error in the ERT log doe not necessarily result in a data error S7 J7A1 S S7t37A14 This bit can only be et if enabled during the ERT set up with the external exerciser Log Error 0 e Byte 7 6 5 4 3 2 0 0 ECC detected a correctable error ECC detected on uncorrectable error Not used 0 No error in sector header One or more errors in sector header o No error in sector body user data 1 One or more erro...

Page 132: ...D 45V UNREG GND 12V 12V 5 2V GND SV GND POWER SUPPLY PCA A4 OUTPUT VOLTAGES S7U7A23 8 10 W6P2 5 8 13 14 15 18 20 1 4 9 12 16 19 OUTPUT RANGE V MAX RIPPLE 5V 4 75 TO 5 25 100 mV 5 2V 4 9 TO 5 40 100 mV 12V 10 8 TO 13 2 200 mV 12V 10 8 TO 13 2 200 mV 45V 30 TO 45 lV 45V 30 TO 45 lV GND Typical values for the 45V outputs ore 32V when seeking 37V when not seeking FIgure P P ...

Page 133: ...cific information When clearing disc logs all associated entries currently in RAM are also cleared Used to clear the cache log on 7936XP 7937XP drives The drive returns the following information MODEL 7937 or 7936 UNIT 0 TYPE DISC Max Cylinder Address 1395 Max Head Address 12 7937 or 6 7936 Max Sector Address 122 Max Block Address 2 232 203 7937 or 1 202 816 7936 Current Interleave 1 The only diag...

Page 134: ...IT ERROR SYSTEM Spin up fai led Servo 1 Servo timing error Servo 2 Heads off track Servo 3 AGC error Servo 4 Sector timing error Servo 5 Data overrun Read Write 6 Undefined 7 Undefined The significance of the Activity Number field is defined as follows ACTIVITY NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NUMBER OF SEEKS none 1 2 3 4 5 to 7 1 second 8 to 200 1 30 seconds 201 to 2 000 30 seconds 5 mi...

Page 135: ... disc logs are cleared when performing an INIT MEDIA operation No device specific information No device specific information Returns all of the data in a sector including the 6 header bytes 2 CRC bytes and 12 ECC bytes The sector address value used when executing this command represents a physical sector address If the track on which the specified sector resides has undergone a sparing operation t...

Page 136: ...gins its seeks If a fault occurs during the test the drive logs the fault and continues with the next length seek Drive status and the fault log provide information concerning the results of the test The test takes approximately 1 minute for each head tested No device specific information The spare table is generated at power on and stored in controller RAM Any spares added since power on are incl...

Page 137: ...gram event value was detected during the execu tion of a controller program task CHANNEL TIMEOUT Fault FRU controll e r The channel program has aborted a transaction be cause the channel byte timer has expired MARGINAL DATA Status On ly The requested data was read from the disc with some difficulty at least one read retry UNRECOVERABLE DATA Fault Data was un recoverable at the specified block addr...

Page 138: ...ve been allocated in dicating medk1 degradation MEDIA WEAR Status On ly The last available spare track was just used ILLEGAL OPCODE Status On ly An unrecognized op code was received ADDRESS BOUNDS Status On ly The target address specified exceeds the address boundary for this device SUSPECT ASSEMBLY Undetermined or parts not required Undetermined or parts not required Most likely caused by a very ...

Page 139: ...ty opcode REQUEST RELEASE Status On ly The drive needs to make a nonvolatile copy of its RAM logs in the disc logs MAINTENANCE TRACK OVERFLOW Status Only The error and fault log areas of the disc are full BAD SPARE AT POWER ON Fau 1t During the power on sequence the mapping of a spare track could not be determined BAD SECTOR MARK TIMER Fau 1t FRU controller During power on diagnostics the SOS L si...

Page 140: ...n SERVO RESYNC TIMEOUT Fault FRU servo The servo system did not respond after attempting to resynchronize the ser vo controller communication interface DATA PATH CONTROL INTERFACE FAULT Fault FRU read wr i te During diag nostic functional testing the data path control bus interface between the read write and controller showed a data miscompare WRITE FAILURE Fau 1t FRU read write During diagnostic ...

Page 141: ...er ECC circuit during a disc read of the reserved selftest data track EMPTY DATA BUFFER NOT DETECTED Fault FRU cont roller The controll er DMA circuit did not inter rupt indicating a DMA RAM buffer empty condition POWER ON Status On ly The drive has completed power on initialization follow ing power disruption UTILITY END Fau 1t This fault is logged at the end of a utility as a dummy error The act...

Page 142: ...EX PULSE Fault FRU servo The once around or Index Mark signal could not be detected during a format operation MODULE ADDRESSING Status On ly An illegal volume or unit number was specified for this device CHANNEL INTERFACE FAULT Fau1t FRU controller A diagnostic test of the host channel inter face circuit in the controller failed PARAMETER BOUNDS Status On ly A parame ter other than unit volume or ...

Page 143: ...t available spare data track for use in sparing FAU LT IN SPARE OR MAINTENANCE TRACK FORMAT Fault A hardware fault occurred while formatting the spare data tracks or the maintenance tracks READ DISC LOGS FAULT Event The disc logs were not readable during a Read Logs command The returned data is only the contents of the RAM logs RAM BUFFER EMPTY FAULT Fau 1t FRU con t ro 11e r The controll er did n...

Page 144: ...ected a bad hardware state of the HP IB channel interface circuit while decoding a received mes sage byte MESSAGE SEQUENCE ERROR Status Only The sequence of the message is incorrect RETRANSMIT COMMAND Status On ly The drive is currently in the release state and unable to complete the last command Retransmit the last command UNRECOGNIZED SECONDARY Status On ly An unknown secon dary message byte was...

Page 145: ...he HP IB interface circuit of the controller COMPLETION FAULT Fault FRU centrell e r The channel message did not complete TRANSPARENT MESSAGE LENGTH ERROR Status On ly The received transparent message was the wrong length UNRECOGNIZED TRANSPARENT COMMAND Status On ly An un known transparent command was received READ LOOPBACK ERROR Status Only Controller fault detected during Read Loopback command ...

Page 146: ...ault condi tion was detected which required resetting the drive POSITION VERIFY ERROR Event FRU servo A verify of the track header ad dress indicates that the heads are positioned incorrectly WRITE SERVO AMPLIFIER FAULT Fault FRU s e rv0 The servo system reported an amplifier fault during a disc write WRITE SERVO AGC ERROR Fault FRU servo The servo system reported an AGC error during a disc write ...

Page 147: ... servo system because the spindle is not spin ning sufficiently UNRESOLVED VERIFY FAILURE Event FRU controller The compen sation seek algorithm was un able to resolve the occurrence of a position verify error CORRECTABLE SEEK ERROR Event FRU servo A position verify er ror has occurred because of head mispositioning correc table using a compensatory seek UNCORRECTABLE SEEK ERROR Event FRU servo A p...

Page 148: ...r position address do not agree FORMAT FAULT Fault Examination of the headers on the current track indicates that one or more sectors have headers which are not consis tently formatted POSITION ERROR Event A position verify error has oc curred because the physical cylinder address field of the header does not match the cur rent target physical address READ SERVO MESSAGE TIMEOUT Event FRU servo A c...

Page 149: ...vent FRU servo The servo message received was not recognized SERVO AMPLIFIER FAULT Event FRU servo The servo system reported a servo amplifier fault SERVO AGe FAULT Event FRU servo The servo system reported a sampled servo AGe fault SERVO RESETTLE TIMING ERROR Event FRU s e rv0 The servo system reported a sampled servo timing error during resettling on track SERVO SETTLE TIMEOUT Event FRU servo Th...

Page 150: ...FRU servo The sampled servo timing marks between sectors was outside the acceptable time window during head settling SEEK TIMEOUT Event FRU servo The request ed seek took too long to complete FAST SERVO TRACK CROSSING Event FRU s e rv0 The heads were moving too fast at the last track crossing to settle on track correctly SEEK BOUNDARY VIOLATION Event FRU servo The last seek com mand would cause th...

Page 151: ...d verifica tion or no guard band was detected SERVO FAULT STATUS PENDING Event FRU s e rv0 The requested seek command was not processed because of pending servo fault status SECTOR TIMING HIGH Event FRU servo The servo system reported the Sector Timing Mark rate ex ceeded the upper specified limit while track following The read write system was idle SECTOR TIMING LOW Event FRU servo The servo syst...

Page 152: ...LE Event FRU controller The Header Available status bit in the controller was not set during a position verify DATA ERROR QUEUE FULL Event The queue for the data error correction was full preventing the start of a disc read A rotational laten cy has been induced CONTROLLER COUNTER FAULT Event FRU controller The diagnos tic which tests the sector timing mark counter in the controller failed DATA ER...

Page 153: ... CONTROLLER FAULT Fault FRU controll e r The controller has detected an illegal program state or hardware condition within itself READ DMA DISC ERROR Event The controller disc DMA has the disc error status bit set No other hardware status is indicated READ ECC TIMING FAULT Event During a read the ECC circuit in the controller had the Timing Fault status bit set No other hardware status indicated O...

Page 154: ...orted a servo error condition and the servo system reported no error READ HDA OVERCURRENT Event FRU read write The read write system reported an overcurrent condition in the head amplifier circuit during a read or position verify WRITE DMA DISC ERROR Event The controller DMA circuit has the Disc Error status set during a disc write WRITE ECC TIMING FAULT Fau 1t The con troller ECC circuit has the ...

Page 155: ...cuit status and DMA circuit status in dicating a detected ECC data error is inconsistent READ DATA OVERRUN Event The read write sys tem reported a data overrun error during a disc read or position verify WRITE DATA OVERRUN Fau 1t The read write sys tem has reported a data over run error during a disc write PARITY DATA ERROR Event The read write sys tem detected a parity data er ror in the sync fie...

Page 156: ...FAULT Fault FRU read write The read write system has indicated an illegal fault status EMINENT POWER FAIL Fault FRU power sup ply The power supply in dicated an impending power failure READ SIGNAL FAULT Event FRU read wr i te The controll er circuits indicated an error during a disc read No error is indicated by the read write system WRITE HOLD OFF WHO FAULT Fault FRU controller The read write sys...

Page 157: ...viously detected fault condition UNSUPPORTED HDA Fault FRU servo The installed controller circuit and program firmware does not support or does not recog nize this version of disc device WRITE SIGNAL FAULT Fault FRU read wr i te The controll er circuit indicates a fault con dition during a disc write The read write system indicates no fault status WRITE SECTOR ADDRESS FAULT Fau 1t FRU con t ro 11e...

Page 158: ...ervo The servo system was offtrack after a system clear or was unable to resettle on track after a previous servo error condition ILLEGAL SERVO COMMAND Event FRU s e rv0 The servo system did not recognize the last servo command issued by the controller SERVO CONTROLLER INTERFACE FAULT Event FRU servo The servo system did not recognize the last servo com mand issued by the controller WRITE SERVO TI...

Page 159: ...d the last servo command and will ignore its completion status SERVO RECALIBRATION REQUIRED Event The servo system requires calibra tion prior to accessing the disc DATA ERROR OVERFLOW MISMATCH Fau 1t FRU controller The DMA and ECC circuits of the con troller have mismatched data error overflow status WRITE HDA OVERCURRENT Fau 1t FRU read wr i te The read write system detected an overcurrent condi...

Page 160: ...MA RAM address pointer had the wrong value at completion of a segment of a disc read WRITE DMA BUFFER POINTER FAULT Fault FRU controller The controller DMA RAM address pointer had the wrong value at completion of a segment of a disc write SAMPLED SERVO GATE SSG TIMING ERROR Event FRU s e rv0 Sampled servo gate timing was outside specified limits during servo recalibration BAD SERVO MEASURE STATUS ...

Page 161: ...ted during seek SERVO TRACK 0 MISSING Event FRU servo Servo information at track 0 not detected during recalibration TRACK 0 LSB INCORRECT Event FRU servo Servo could not verify positioning at track 0 during recalibration ERROR CORRECTION HEADER MISCOMPARE Fault FRU controll e r After successful data er ror correction the header field read from the disc did not match the target header SUSPECT ASSE...

Page 162: ...30 12UF 6 EXT INPUT 31 OTEN H 7 lOB 32 AMPFLT L 8 SEEK CC 33 TFOUT 9 DLVL 34 SSGT L 10 ERRSIG 35 TER2 11 TF INPUT 36 OTO L 12 PWM L 37 SPOS 13 DSRVPT 38 TCRS S 14 SMOT H 39 TESTEN L 15 AGNO 40 AGCF L 16 ZOT 41 ABORT 17 SLPES 42 GBDEN H 18 DGND 43 SAGC 19 12UF 44 FSEN L 20 5V 45 OF TU L 21 PES 46 DAGC 22 AMFU H 47 OPOS 23 OPOS 48 INDEX H 24 DC OFST 49 SRTF H 25 SLVL 50 TRKCR H S7t37A72 Figure 8 4 S...

Page 163: ...ervo PCA Al if other faults exist Voltage indication of current flow through the actuator Scale is 0 5A volt Overall timing error caused by SOS L gap not occurring at a designated time Used to increase decrease level to triangle wave comparator CAUTION If this level is too high low it can pin the ac tuator to a crash stop and cause HDA damage Dibits which are integrated Test point for examining ou...

Page 164: ...g transistors Amplified signal from dedicated servo head Asserted by the servo system when the dedicated servo code sector mark pattern is detected Analog Ground Changes state when missing dibits in the sector mark or guard band mark are detected When track following system switches to slew PES to be less sensitive to changes in position glitches Digital Ground 12 Vdc power supply output before PI...

Page 165: ...used for sampled servo AGC Complete window for entire sampled ser vo code Integrated sum of all positive dedicated servo peaks to control VCO which creates read clock Dedicated servo positive scaled for input to VCO integrator Combination of off track or timing error 1 and 2 12 Vdc output of power supply before the PI filters Tie this point low to disable off track faults CAUTION This means that w...

Page 166: ...d A dibits to give sampled track following Track crossing divided by 5 when seeking fast track crossing when seeking slow Comes from diagnostic mode switch at rear of drive See chapter 3 for details Active when sampled AGC level falls too far below or above a reference Output for test only Switches between guard band detection and sector mark detection Clocked and integrated SLVL used for AGC of s...

Page 167: ...SIGNAL PIN 1 BIT8 9 2 FRAME 10 3 RDGT H 1 1 4 OATAEN 12 5 AGNO 1 3 6 DPIRQ L 14 7 5 2 15 8 FIL 16 SIGNAL TRAN WGTO L RDEN H WOATA H SOS L DMARG DQAL L DGNO Figure 8 5 Read Write Test Point peA Troubleshooting and Diagnostics 7936 and 7937 TOGGLE SWI TCH ENABLES TRAN SEE TABLE 8 4 8 45 ...

Page 168: ... sector read Internal to read write controller Not used Frame asserts data enable header in cluded This is the first sync bit out of the read write controller Analog ground Read write controller has received fault condition for example write holdoff For development only S 2V Read write controller will ignore all fault conditions CAUTION allows writing in the sampled servo area Rises each time a fl...

Page 169: ... Low Digital Ground DESCRIPTION Decreases timing margin to read path An input to the read write peA used to test margins lOY gives no reading to good reading range For safety do not exceed lOY Decreases amplitude qualification duty cycle Normal 72 in system field Not used at this time except for factory testing Grounding produces more errors Small defects become large Digital ground 8 47 ...

Page 170: ......

Page 171: ...The Hewlett Packard number for each replaceable part c DESCRIPTION The description of each replaceable part Refer to table 9 5 for an ex planation of the abbreviations used the 9 DESCRIPTION column d MFR CODE The 5 digit code that denotes a typical manufacturer of a part Refer to table 9 6 for a listing of manufacturers that cor responds to the codes e MFR PART NO The manufacturer s part number fo...

Page 172: ...ter Assembly FL1 Ground Spring Assembly Primary Power PCA A8 LED PCA A7 Power Supply Output Cable Assembly W4 07937 60164 07937 60051 07937 60173 07937 80033 07937 80034 07937 10104 07937 10201 07937 69001 07937 69018 07937 69035 07937 69037 07937 69073 Power Supply Input Cable Assembly W3 Motor Assembly B1 Primary Power Cable Assembly W1 Drive Belt 60 Hz Drive Belt 50 Hz EPROM Kit H P IB EPROM Ki...

Page 173: ...00080 20 0515 0380 7936XP 7937XP only SERVO PCA PCA A1 SCREW machine pnh T10 M3 0 by 0 5 8 mm long w scw GROUND ASSEMBLY R W SCREW machine pnh T10 M3 0 by 0 5 14 mm long w scw PCA SHIELD READ WRITE PCA PCA A2 SCREW machine pnh T10 M3 0 by 0 5 8 mm long w scw LABEL power 240 220 208 200V 50 60 Hz LABEL power 120 100V 50 60 Hz SCREW mach ne pnh T15 M4 0 by 0 7 10 mm long w scw 21 0515 0372 SCREW mac...

Page 174: ...0 47 0515 0380 48 0515 0372 49 07937 00085 50 1390 0740 51 0403 0086 52 0515 0380 53 07937 80181 54 07937 60184 55 07937 80033 RECEIVER stud snap in Attaching Parts WASHER lock helical 3 0 mm SCREW tapping pnh pozi 3 24 0 250 in long X SCREW machine pnh T10 M3 0 by 0 5 8 mm long w scw LED DISPLAY ASSEMBLY PCA A7 SCREW machine pnh T15 M4 0 by 0 7 10 mm long w scw SCREW machine pnh T10 M3 0 by 0 5 8...

Page 175: ...7937 20105 81 0515 0369 82 07937 20126 83 07937 00013 84 0515 0 69 locking ROTOR fan SCREW machine pnh T10 M3 0 by 0 5 8 mm long w scw SCROLL fan MOTOR ASSEMBLY B1 SCREW machine 90 deg fh T9 M3 0 by 0 5 6 mm long PCA GUIDE upper SCREW machine 90 deg fh T9 M3 0 by 0 5 6 mm long PCA GUIDE lower SCREW machine 90 deg fh T9 M3 0 by 0 5 6 mm long BLOCK HDA SCREW machine 90 deg fh T9 M3 0 by 0 5 6 mm lon...

Page 176: ...STUD snap in 28480 ENCLOSURE ASEMBLY 28480 SPRING belt 28480 POWER CORD ASSEMBLY NEMA5A CEE 28480 POWER CORD ASSEMBLY NEMA5A CEE 28480 POWER CORD ASSEMBLY BS 1363 CEE 28480 POWER CORD ASSEMBLY ASC 112 CEE 28480 POWER CORD ASSEMBLY GMBH CEE 28480 POWER CORD ASSEMBLY CEE CEE 28480 POWER CORD ASSEMBLY SEV CEE 28480 POWER CORD ASSEMBLY MDPP CEE 28480 POWER CORD ASSEMBLY SABS CEE 28480 HP IB CABLE ASSE...

Page 177: ...60 I I I 52 74 I 91 1 X 48 42 41 J1 S711J7A71 ...

Page 178: ... I I 33 40 9 i I I I J2 J3 8 ___ W7 Replaceable Parts 7936 AND 7937 4D J 13 35 I I DETAIL A 93 Figure 9 1 Disc Drive Exploded View 9 7 ...

Page 179: ...55 mm 28480 0400 0248 1 ANTI TIP FOOT ASSEMBLY right 28480 19511 60007 1 Attaching Parts It SCREW cap slotted M6 by 1 0 28480 0515 1726 2 14 mm long X PAD leveling 28480 0403 0484 1 It ANTI TIP FOOT ASSEMBLY left 28480 19511 60002 1 Attaching Parts SCREW cap slotted M6 by 1 0 28480 0515 1726 2 14 mm long X PAD leveling 28480 0403 0484 1 TRIM PANEL ASSEMBLY 28480 5061 3139 1 It SCREW machine pnh T1...

Page 180: ...II II 15 25 24 S71137A311 17 16 11 Replaceable Parts 7936 AND 7937 Figure 9 2 HP 19511 A Cabinet Exploded View 9 9 ...

Page 181: ...arts NUT sheetmetal 10 32 00000 aBO 4 SCREW machine pnh T25 10 32 0 5 in_ 00000 aBO 4 long w scw X RETAINER 28480 19512 00002 2 Attaching Parts SCREW machine pnh T15 M4 0 by 0 7 00000 aBO 2 10 mm long w scw 1 X RACK SLIDE PAIR 28480 07937 80114 1 RACK SLIDE left 28480 07937 80083 1 Attaching Parts SCREW machine pnh T15 M4 05 by 0 7 00000 aBO 2 6 mm long w scw l X RACK SLIDE right 28480 07937 80098...

Page 182: ...f 11 FIgure ReplaceahIe Parts 7936 AND 7937 10 9 11 ...

Page 183: ...oxide mfr manufacturer misc mm mtg My n n c no NSR ntd OBD 00 ovh oxd P PCA phh pnh P O pot pozi miscellaneous mi l l imetre mounting Mylar 9 nano 10 norma l ly cl osed number not separately replaceable no time delay order by description outside diameter oval head oxide 12 pico 10 printed circuit assembly ph ill ips head pan head part of potentiometer Pozidriv qty rdh rect ref rf rfi rh rpm rwv sb...

Page 184: ...Table 9 5 Code List of Manufacturers CODE NO MANUFACTURER 28480 Hewlett Packard Co 6001 E Littlefuse Inc ADDRESS Replaceable Parts 7936 AND 7937 Palo Alto CA Des Plaines IL 9 13 ...

Page 185: ...the drive This ap pendix describes HP IB Controller part no 07937 60035 and HP IB Cache Controller part no 07937 60037 These controlJers are installed in the 10 HP 7936H 7937H Disc Drive and and HP 7936XP 7937XP Disc Drive respectively NOTE In this manual the controllers are desig nated collectively as PCA A6 10 1 ...

Page 186: ... History 11 1 INTRODUCTION This chapter documents by means of backdating information fo r other chapters of the manual ear lier versions of the drive At present no such backdating information is needed 11 11 1 ...

Page 187: ...by separate drawings which show the input and output signals at the connectors of each assembly in the drive and details of the interconnecting cables Two tables also provide additional signal distribution information This signal distribution documentation consists of the following tables and figures Table 12 1 An alphabetical listing of the sig nal mnemonics used in the parts location and connect...

Page 188: ...s and wiring Figures 12 13 through 12 19 Parts location and connector pinout drawings for assemblies Al through A8 excluding controller PCA A6 see figure A 4 These drawings show 12 2 location of connectors rnating cable connectors connector pinout information directional of signal flow other parts Figure A 4 This figure contains the parts location and connector pinout for controller PCA A6 12 6 FU...

Page 189: ... Reference A2J7 4 A3JI 4 000 Disc Data A6PI 46 A2JI 46 Disc Data 001 bits 0 A6PI 4S A2JI 4S Bus 002 thru 7 A6PI 48 A2JI 48 003 A6PI 47 A2JI 47 004 A6Pl SO A2JI SO DDS A6PI 49 A2JI 49 006 A6PI S2 A2JI S2 DO A6PI SI A2J I S1 DDS H Disc Data A2JI 41 A6PI 41 Disc Data Strobe Bus DEDP Dedicated A2P2 13 14 AIJ2 13 14 Differential DEDN Servo A2P2 1S 16 AU2 1S 16 signal DIDO Drive A3JI 2S A2J7 2S Ident A2...

Page 190: ...l Control Bus Select OPIRQ L Data Path A2Jl 36 A6PI 36 Data Path Interrupt control Bus Request OPRHW L Data Path A6PI 35 A2JI 35 Data Path Read High Control Bus Write Low OSOS H Differentia1 AUl 47 A2Pl 47 OSOS L Start of AUl 48 A2PI 48 Sector OWC H Differential AUI 49 A2PI 49 OWC L Write AUl 50 A2PI 50 Clock OX Read Write A2J7 57 A3Jl 57 Bidirectional OY Data A2J7 60 A3Jl 60 differential signal G...

Page 191: ...2P2 42 43 Drive A2J7 33 thru 36 38 A3J1 33 thru 36 38 MOTOR Actuator AIJ2 46 47 A2P2 46 47 Drive A2J7 28 thru 32 A3J1 28 thru 32 PF L Power Fail A4J2 1 ASJ2 2 ASJS 2 A2J6 6 A2JI 20 A6PI 20 POR L Power On A4J2 2 ASJ2 3 Reset ASJS l A2J6 S A2JI 18 A6PI 18 A2PI 43 A111 43 RAGC H Read AGC A112 2 A2P2 2 Differential RAGC L Gate A112 1 A2P2 1 signal RLED Red LED A6P2 2 A2J4 2 A2J6 2 ASJS 6 ASJ2 7 A7JI 3...

Page 192: ...ilable A2PI 37 Bus A1JI 37 SOX Servo A3J 1 12 A2J7 12 Differential SOY Data A3Jl 14 A2J7 14 signal SOO Servo Data A6PI 2 A2Jl 2 Bidirectional bit 0 A2Pl 25 Servo Control AIJI 25 Bus SDO thru SD7 S01 Servo Data A6Pl l A2Jl 1 bit 1 A2PI 26 AIJl 26 S02 Servo Data A6Pl 4 A2Jl 4 bit 2 A2Pl 27 AIJl 27 S03 Servo Data A6Pl 3 A2Jl 3 bit 3 A2PI 28 AUI 28 S04 Servo Data A6Pl 6 A2Jl 6 bit 4 A2Pl 29 AUI 29 SOS...

Page 193: ...H Servo Head A2J7 l8 A3Jl l8 Select SOS L Start of A2Jl 19 A6PI 19 Disc Data Sector Bus SPOSNS L Speed Sense W5 A5J3 1 A5J5 3 A2J6 7 A2PI 40 AUI 40 SPR L Servo A6Pl 16 A2JI 16 Servo Control Processor A2PI 44 Bus Reset AUl 44 SRO L Servo AUI 35 A2PI 35 Servo Control Read A2JI 12 Bus A6PI 12 SRVER L Servo AUl 45 A2PI 45 Error SSEN H Sampled AU2 4 A2P2 4 Differential SSEN L Servo AU2 3 A2P2 3 signal ...

Page 194: ...te use only Select US Unsafe A3Jl SI A2J7 S1 we Write A2J7 S3 A3Jl S3 Current weso Write A2J7 1 A3Jl l Current Select 0 WeS1 Write A2J7 I7 A3JI I7 Current Select 1 WHO L Write A6PI 37 A2Jl 37 Disc Data Hold Off Bus WSA Write A2J7 4S A3JI 45 Select A WSB Write A2J7 48 A3JI 48 Select B YLED Yellow A6P2 4 A2J4 4 LED A2J6 3 ASJ5 7 ASJ2 6 A7JI 2 12 8 ...

Page 195: ...A2J7 21 49 A3Jl 21 49 5V A4J2 4 S S ASJI 2 4 6 4 7SV to S 2SV ASJ4 S thru S ripple 100 mV pp max A2JS 13 thru 16 A2Pl 19 thru 21 AU 1 19 thru 21 A2J4 S thru 16 A6P2 S thru 16 A2J7 13 A3JI 13 45V A4J2 IS ASJl IS 30V to 4SV ripple 1V pp ASJ4 1S max Typical values are A2JS 3 32V when seeking and 37V A2Pl S 9 when not seeking AUI 8 9 12V A4J2 7 ASJI IO lO SY to 13 2Y ASJ4 14 ripple 200 mV pp max A2JS ...

Page 196: ... 7 64 6 50 3 44 SIDE VIEW M4 X 0 7 PEM NUT 4 PLCS EACH SIDE EM37A3 12 10 12 77 1 324 2 I __ 212 7 t 8 37 FRONT VIEW 2 10 69 0 NOTE DIMENSIONS ARE IN MM IN Figure 12 1 Drive DImensIons 324 2 t 12 77 I c J D aaaaaaaaa aaaaaaaaa r _ aaaaaaaaa I l aaaaaaaaa aaaaaaaaa g gggggggg aaaaaaaaa r taaaaaaaaa L Jaaaaaaaaa aaaaaaaaa REAR VIEW ...

Page 197: ...I 79J7AI4 1 8 07 3 1 8 UV SIDE VIEW FRONT VIEW 720 28 3 NOTE DIMENSIONS ARE IN MM IN FIgure 12 HP 19511A Cabinet Dimensions Diagrams 7936 and 7937 12 11 ...

Page 198: ...R OF DRIVE POWER CORD S7t37AI 12 12 SPINDLE MOTOR MOTOR PULLEY FRONT OF DRIVE PRIMARY POWER PCA A8 tt ____ 11 INCOM ING L F II AIR SPINDLE MOTOR TOP VlEW SERVO PCA Al FAN INLET POWER SUPPLY PCA A4 SECTION A A FAN IMPELLER FAN SCROLL POWER SUPPLY PCA A4 Figure 1 3 Airflow Within Drive ...

Page 199: ...CA A2 READIWRITE PCA A2 CONTROLLER PCA A6 ACCESS COVER Diagrams 7936 and 7937 SERVO PCA A1 ACCESS COVER AC POWER CONNECTOR LED PCA A7 BEHIND FRONT PANEL SPINDLE MOTOR B1 POWER DISTRIBUTION PCA A5 LINE FILTER FL1 Figure 2 LocatIOn of Assemblies an Parts 12 13 ...

Page 200: ...37 tILTER tL1 S7iJ7AI7 12 14 PIN 1 PIN ASSIGNMENTS SIGNAL Pl P2 WIRE NEUTRAL 1 1 BLU GRN VEL EARTH 2 2 LINE 3 3 BRN NOTES 1 CABLE PART NO 07937 60173 2 3 CONOUCTOR CABLE 18 AWG P2 SEE NOTE 2 PRIMARY _ POWER PCA A8J4 PIN 1 ...

Page 201: ...GNMENTS SIGNAL P1 P2 WIRE NEUTRAL 1 1 BRN SEE EARTH 2 2 BLU NOTE 2 LINE 4 4 GRN YEL NOTES 1 CABLE PART NO 07937 60164 2 3 CONDUCTOR CABLE 18 Awe FIgure 1 6 Power Supply Input a Ie Assembly W3 Diagrams 7936 and 7937 PRIMARY t _ POWER PCA A8J7 PIN 1 12 15 ...

Page 202: ...7 45V 18 CLEO YlED SCAP l 5V RlEO 5V P2 P3 2 3 1 2 4 3 10 6 5 7 9 11 12 13 17 8 16 15 5 6 1 4 7 8 P5 PRIMARY POWER PCA A8J5 Po1 1 2 3 4 NOTE CABLE PART NO 07937 60163 FIgure 1 7 Power Supply Output lED PCA A7Jl 1 P3 8 1 g lf5 4a 8 P5 WIRE GRN AWG WHT RED 22 BlK WHT WHT BlK RED WHT BlK BlK 18 AWG BlK BlK ORN BlK VIO GRA BlK BLK ORN 2 BlK 4 WHT 22 AWG RED WHT GRN POWER DIST PCA A5J1 P2 POWER DIST PC...

Page 203: ...7 PIN ASSIGNMENTS SIGNAL Pl GND 1 SPD SNS 2 5v 3 SPEED SENSOR SPEED SENSOR WIRE WHT BlK RED NOTES 1 Coble port no 07937 60038 peed Sensor able Assembly W5 Diagrams 7936 and 7937 SPINDLE HEAD DISC ASSEMBLY A3 12 17 ...

Page 204: ...0 0 0 0 0 0 0 0 0 0 0 20 PIN ASSIGNMENTS SIGNAL 45V GND 45V KEY GND 12V 12V 5 2V GND GND P1 P2 WIRE SIGNAL P1 P2 1 20 NOTE 2 GND 11 2 19 GND 12 3 18 5V 13 4 17 5V 14 5 16 5V 15 6 15 5V 16 7 14 GND 17 8 13 GND 18 9 12 GND 19 10 11 GND 20 NOTES 1 Cob Ie par t no 07937 60064 2 Wire ORN 18 AWG 10 9 8 7 6 5 4 3 2 1 Figure 12 9 Power Jumper a Ie Assembly W6 WIRE NOTE 2 ...

Page 205: ...Pl P2 WIRE POR l 5 1 NOTE 2 Pf l 6 2 SCAP L 8 4 SPO SNS L 7 3 lEOP 5V 1 5 RlEO 2 6 YlEO 3 7 GLEO 4 8 NOTES 1 Cob Ie par t no 07937 60065 2 AI I wires BlK 22 AWG FIgure 1 10 SIgnal Jumper a Ie Assembly W7 Diagrams 7936 and 7937 POWER OIST PCA A5J5 12 19 ...

Page 206: ...STRIPE P2 WIRE SIGNAL P1 P2 1 NOTE 2 MOTOR 31 31 2 32 32 3 MOTOR 33 33 4 34 34 5 35 35 6 36 36 7 GNO 37 37 8 MOTOR 38 38 9 GND 39 39 10 40 40 11 41 41 12 0101 42 42 13 CEO L 43 43 14 GNO 44 44 15 WSA 45 45 16 CE3 L 46 46 17 HS1 L 47 47 18 WSB 48 48 19 6V 49 49 20 CE2 L 50 50 21 US 51 51 22 CE1 L 52 52 23 we 53 53 24 4V 54 54 25 GNO 55 55 26 HS2 L 56 56 27 Ox 57 57 28 GND 58 58 29 GNO 59 59 30 OY 6...

Page 207: ...1 thru A5 A7 and AB Con t r 0 I Ie r PCA A6 installed in the drive is designated PRIMARY POWER PCA A6 regardless of its host interface function Refer PCA A8 to the appropriate appendix at the rear of this manual for connector pinout information appl icable to the controller in J2 J7 J5 J4 J3 installed the drive 115 VAC J1 240 VAC J2 LED PCA A7 J1 W4P4 S71137A57 POWER SUPPLY PCA A4 W4 W3P2 W3 W4P5 ...

Page 208: ... 47 48 49 50 A1J2 RAGC L RAGC H 2 SSEN L 3 SSEN H 4 DIDO 5 DID1 6 SGR 7 DAR 8 GND 9 10 11 12 DEDP 13 14 DEDN 15 16 17 18 DAGC 19 20 DEDBP 21 DEDAP 22 GND 23 24 SAGC 25 26 GND 27 28 SSMPP 29 30 SSMPN 31 32 GND 33 34 35 36 SMPBP 37 SMPAP 38 GND 39 40 41 MOTOR MOTOR GND SERVO PCA A1 COMPONENT SIDE NOTE Direction of signal flow in and out of PCA A1 is t _i i a d_a f w B I T O L I t 2 J1 2 J2 49 50 Dia...

Page 209: ...6 DPIRQ L SMP8P 37 WHO L SMPAP 38 DPAO H GND 39 GND 40 SEF L 41 ODS H MOTOR 42 GND 43 44 45 DD1 MOTOR 46 DDO 47 D03 48 002 49 005 GND DD4 007 DD6 A2J1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 1 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 t 43 44 45 46 47 48 49 50 51 52 WCSO 12V CH1 H DAR CHO H 12V H02S H SGR H01S H 8S0S H GND SOX 5V SOY GND WCS1 SHS H SWC 4V 6V SWS ...

Page 210: ...PF L SPDSNS L SSR L SCAP L A2J6 r 1 2 3 4 5 6 7 8 SERVO PCA A1J1 2 P1 49 50 2 SERVO PCA A1J2 P2 NOTE Direction of signal flow in and out of PCA A2 is t _i i a d_a f 1 w B I o fiI t I 49 50 CONTROLLER PCA A6P1 t 2 52 IIJIIIIIIIIIIIIIIIIIIIIIIIII II 1 J1 51 CONTROLLER PCA A6P2 t 2 30 II 11111111111111i 1 1 J4 2 J5 NOTE Four terminals at either end of J1 and J4 are not used R W PCA A2 COMPONENT SIDE ...

Page 211: ...1 22 23 L 24 25 26 L 27 28 29 30 31 32 33 34 35 36 37 38 39 C 40 41 42 43 44 45 46 47 48 49 50 L 5V SPEED SENSOR SPD SNS t GND NOTE Direction of signal flow in and out of A3 is t _i i a d_a f w BI RECTIO L tiI t A3J1 CONT US 51 CE1 L 52 WC 53 4V 54 GND 55 HS2 L 56 DX 57 GND 58 59 DY 60 II SPEED SENSOR W5 A3J1 o 0 R AD WRITE PCA A2J7 VIA HDA CABLE W8 Diagrams 7936 and 7937 Figure 12 15 HDA Assembly...

Page 212: ...T CABLE W4 3 1 000 000 000 000 000 000 18 16 J2 POWER SUPPLY PCA A4 COMPONENT SIDE 230 V 115 V J1 1eO 132 AC POWER CONFIGURATION 250 V 0 FUSE o 6 3 A 0 NOTE DIRECTION OF SIGNAL FLOW IN AND OUT OF PCA A4 IS INDICATED AS FOLLOWS PCA A4 A4J I IN l1 OUT 2 I 3 I I r PRIMARY POWER PCA A8J7 VIA POWER SUPP Y INPUT CABLE W3 Diagrams 7936 and 7937 Figure 12 16 Power Supply PCA A4 Parts Location and Connecto...

Page 213: ... 20 45V NOTE Direction of signal flow in and out of PCA A5 is B I T O Al tiI 1_____ I 1 POWER SUPPLY PCA A4J2 CVIA POWER SUPPL Y OUTPUT CABLE W4 PRIMARY POWER PCA A8J5 LED PCA A7J1 VIA POWER SUPPL Y oUTPUT CABLE W4 HEAD DISC ASSEMBLY A3 VIA SPEED ENSE CABLE W5 o D o o D o D D D o D o D D D D 17 15 13 J1 J4 POWER DISTRIBUTION PCA A5 COMPONENT SIDE 8 4 J2 5 1 1 5 J5 4 8 o Diagrams 7936 and 7937 R AD...

Page 214: ...iagrams 7936 and 7937 S79J7A50 12 32 0 I I I II CR3 CR2 CRl RED YEL GRN J 1 0 t POWER DISTRIBUTION PCA A5 VIA POWER SUPPLY OUTPUT CABLE W4 0 I Figure 12 18 LED PCA A7 Parts Location and Connector Pinout ...

Page 215: ...J I o I t S1 Diagrams 7936 and 7937 LINE r SW ITCH LINE FILTER 1 V It L p1R JI1ARY 10001 POWER CABLE W1 J4 POWER DISTRIBUTION PCA A5J2 VIA POWER SUPPLY OUTPUT CABLE W4 MOTOR B1 VIA B1P2 POWER SUPPLY PCA A4J1 VIA POWER SUPPLY INPUT CABLE W3 J5 240V 180 264 000 1 000 4 000 7 000 10 J2 000 1 000 4 000 7 000 10 J1 115V 90 132 AC POWER CONFIGURATION 1 O o J7 1 MOTOR B1 VIA B1P1 J3 J6 C1 Figure 12 19 Pr...

Page 216: ...CKT DEDICATED SERVO AGC AMPLIFIER A2J7 36 19 I A2P2 SSEN L 3 SSEN H 4 RAGC L 1 1 RAGC H 2 DEDP 13 14 DEDN 15 16 DAGC 19 20 DIDO I 5 DID1 I 6 I A2J1 SDO SD7 8 1 8 I 7 A2P1 r 25 32 SRD L 12 I SWR L 11 I INDEX H 15 I 13 SBF L 14 SDAV L 16 SPR L r 35 r 36 r 39 r _ 38 r 37 r _ 44 I REF i SGR GAP L A1J1 L i SRG SAMPLED I I AGC L REF CKT I L SRG A1J2 DEDICATED I L AGC I REF CKT I L I I DEDICATED SERVO CI...

Page 217: ...LSB H r FILTER I AMP PLL DSRVN ASMP L BSMP L DMP H GBO H DAGC POSITION DPOS I T AGC DLVL f DPOS f DPOS 46 DEMODULATOR INTEGRATOR 9 7 TRACK 27 28 TERR1 L 2 BIT CROSSING 47 TERR2 L ADC DETECTOR e38 _OFTU L I I SRVER L FAULT t t TRKCR H SSSL H 29 0 LATCHES 49 50 GBDEN H SRTF H OFTRK H ACQUIRE H CLSER L t CLER L SOSEN H SDO S07 LCK L QUAD H SRO L LSB H SWR L SERVO GBD H SBF L CONTROLLER SSGT L SDAV L ...

Page 218: ...S I QEN L 45V I I 1 PUL SE TRANS I STOR QUTPl WIDTH t I DR IVER TRANS I MODULATOR QEN L FSEN L g 6 8 L _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ 12 FROM SHEET 1 S1 GDCLK fSEN L 44 A PACC L NACC L AMPEN H AMPfLT L 32 _ A S711J7A14 s GENERATOR PACC L NACC L UNDER 45V I VOL TAGE 45V Ip DETECTOR GDCLK UNDER VL T L__ PWM L o PWM L MISSING PWM CLOCK DETECTOR NO CLK H 3 OVER CU VELOCITYf S DETECTOR AMP fSEN L QEN L...

Page 219: ...I I MOTOR I 38 I I 38 I _ _ _ t 1 1 1 4 7 46 47 i i 28 32 28 32 45V ACTUATOR I PULSE TRANSISTOR OUTPUT WIDTH DR I VER I TRANS I STOR MODULATOR QEN L I L _ I I I I I L _ _ _ _ _ _ _ _ _ _ ___ __ _ CURRENT COMMAND e 8 12 GENERATOR j NACC L 45V UNDER VOLTAGE 45V DETECTOR GDCLK UNDER VLT L PWM L 0 PWM L MISSING PWM CLOCK DETECTOR OVER VELOC I TY 14 DETECTOR ACUR CURRENT SENSE AMPLIFIER NO CLK H 3 fSEN...

Page 220: ... OPC7 000 007 SEF L _ OOS H 1 WCLK L CURUS H UNSAFE us DETECTOR R W CONTROLLER IC HS1 L r CHIPO H HS2 L I CONTROL SECTION I CHI PO H CH IP3 H 4 CHIP1 H CEO L I I f HEAD CE1 L ADDRESS HDS1 H HDS2 H 1 2 CHIP2 H I REGISTER I f SELECT 1 WCSO WCS1 L 2 CHIP3 H CE2 L I I f ENCODER I HDS1 H CE3 L I OPIRQ L 8 I 1 I HDS2 H CHO H I 1 J STATUS 3 CH1 H I REGISTER I HDS2 H CURUS H i I FAULT HDS1 H I I DETECT I ...

Page 221: ... 48 53 18 57 60 I 10 4 8 12 14 I I I W8 W8P1 I W8P2 I I I I I I I I I I I 1 I I I I I I I I I I I I 1 I I I I I I I I 1 I I I 1 I I I I I 3 J 1 I 1 I 1 I I I I I I I I I I I I I I I 1 I I I l 1 1 I I Diagrams 7936 and 7937 r I HEAD DISC ASSEMBLY A3 I I I I A3J1 I 57 DX 60 51 45 48 53 47 56 42 52 50 46 5 3 9 7 17 10 4 8 49 47 43 I 1 I I I I I I I I I I 1 I I I 1 1 1 I I I I 1 I I I I I I I I I I I ...

Page 222: ...O BLK SPINDLE MOTOR 81 B1P1 2 J J D 3 4 o J W J D V 5 6 7 V B J W Cl r w a z 9 10 11 0 12 _ A8J1 I 115V 90 132 ABJ4 GND 2 t t l 1 J l A 8J 7 1 0 NEUTRAL 4 G I 2 N 3 I I LINE I r J 6 1 L LINE V 4 3 C1 START I L _ f 1 CAP I K1 I MARY POWER peA A8 START RELAY 2 ABJ5 I 4 2 ____ J W5 W51 W4P2 r I u ND EU INE W4 P5 W4 5V r I SCAP L L i ...

Page 223: ...132 A8J7 I I A8J5 r 4 GND 2 NEU 1 LINE W4P5 W4 5V 4 r SCAP L 2 i _ J W5 W5Pl W4P2 WER 0 I STR I BUT ION 0 IPCA A5 A5J3 SPDSNS L A5J5 1 i I 3 3 5V I 2 I W7 r AD W ITE PCA A2 I A2J6 SPDSNS L 7 1 A2Pl I 40 I I I I I I A5J2 SCAP L II SCAP L 1 f _ _ _ I 7 4 O L 8 I00I 1 1 _ 1 42 5V I I I L __ J L I A1Jl SPDSNS I I i SCAP L Diagrams 7936 and 7937 SERVO CONTROLLER SD Figure 12 22 Spindle Drive System Fun...

Page 224: ...I POR L I I 12V I 12V I T 5 2V I 5V I 45V I I 45V 1 7 2 13 7 16 I I I I I I T I 4 5 8 I 15 18 3 6 9 12 14 1 I I I I 1 I W4 W4P2 1 I J I W4P2 I W4P3 I I IJ 1 1 J 1 I IJ IfciwER D I STR I BUT ION IPCA A5 A5J2 RLED 7 14 6 I YLED I 5 I 8 I GLED LEDP Pf L A5J5 I I 6 I 7 I 8 I I 5 I POR L 2 2 3 A5J2 PF L POR L A5J1 12V A5J4 12 12V 1 10 I 8 1 2 4 6 1 1 17 5 2V 1 5V 45V 45V 1 15 t t 1 ____ GND 15 14 13 5 ...

Page 225: ...W6P2 fREAD WRITE PCA A2 A2J6 2 3 I 4 RLED YLED GLED A2J4 I I I A6P2 2 RLED 4 YLED 3 GLED f 0lIl 1 41 LEDP 5V R L BUFFER II T__ R_ _ _ t 2 4J A6P1 20 r 1 PF L I 18 r 1 POR L A6P2 1 1 5 2V A2J4 POR L I I 5 16 5V 17 3 O _ _ __ A2P1 ISERVO PCA A 1 A1J1 6 A2J5 12V I I 43 POR L 13 I 12V 7 8 13 16 3 I 12V I I 5 2V 1 I 5V 1 1 I 45V I I 45V I I I I 15 I 12V 14 I 5 2V 9 21 5V 4 5 45V 8 9 45V SEE S2 12V 12V ...

Page 226: ...ers signals between the controller and t1arious drive switches and the front panel LEOs A A 3 HP IB The Hewlett Packard Interface Bus HP IB provides a standardized method of connecting separate devices The interface functions for each system component are performed within the com ponent so only passive cabling is needed to con nect the system The cable connects all controllers and other devices of...

Page 227: ...onnected to the bus may be talkers lis teners or controllers refer to table A I The Controller In Charge CIC dictates the role of each of the other devices by setting the Attention ATN L line low and sending talk or listen ad dresses on the data lines Addresses are set for each device at the time of system configuration While the ATN L line is low all devices must listen to the data lines When the...

Page 228: ...l commands usually a single byte are used to manage operations on the inter face channel DeVice commands usually more than one byte are to control tile operation and are contained withiq the text of a command message UNIVERSAL COMMAND A channel command that causes all evices on the bus to perr orm a predetermined interface function Refer to table A 2 In a parallel poll system there can be up to 8 ...

Page 229: ...west address first Parallel Poll Enable PPE and Parallel Poll Disable PPD are internal states of the disc drive controller PPE occurs when the disc drive requires service from the CIC PPD is the opposite state and occurs A 4 whenever the disc drive is active for example busy executinga command or idle A Parallel Poll Response PPR from the disc drive will occur if the CIC asserts both ATN L and EOI...

Page 230: ...troller 7936 AND 7937 plete description of each ESI signal is provided in Chapter 5 A t 1 DISC DATA BUS The disc data bus in cludes the following data and control lines DDO DD7 Bi directional 8 bit disc data bus DDS H Disc Data Strobe SEF L Start ECC Field SOS L Start Of Sector WHO L Write Hold Off All data written to or read from the disc media is transferred over the disc data bus Disc data is c...

Page 231: ...12 DATA PATH CONTROL BUS The data path control bus includes the following signals DPO DP7 Bi directional 8 bit control data bus DPRHW L Data Path Read Write DPAO Data Path Address Zero DPCS L Data Path Control Select DPIRQ L Data Path Interrupt Request A 6 The data path control bus is used to transfer con trol and status information between the controller and the R W PCA The controller sends comma...

Page 232: ...SRW L i If the servo interface buffer is ful the controllfr asserts SBF L indicating to the Servo PCA that no additional status bytes can be accepted The SPR L si nal resets the servo system microprocessor HP IB Controller 7936 AND 7937 A 14 MISCELLANEOUS SIGNALS Included in the ESI architecture are three miscellaneous signals INDX L Index POR L Power On ReSet PF L Power Fail INDX L is a timing si...

Page 233: ... the controller brings the drive on line If all hardware functional tests were successful the drive is ready to process commands from the host If a functional test failed the controller reports the failure to the host The appropriate failure code is also passed to the front panel LEOs If the selftest switch is in the DIAGNOSTIC MODE the controller does not bring the drive on line following the har...

Page 234: ...command is passed to th channel module s flash decoder for HP IB Controller 7936 AND 7937 decoding Using the address included with the command the channel module initiates a seek to the desired data The channel module then passes the decoded command to the CS 80 module which continues execution of the command While the seek is being performed the CS 80 module prepares the read write system for the...

Page 235: ... ROM and RAM clocks timers and interrupt control The remainder of the controller hardware supports the peA s external interfaces HP IB ESI and the human interface The functional blocks of the hardware architecture are shown in figure A 3 A lO A 23 HP IB CIRCUITRY The HP IB circuits are responsible for transferring data over the host HP IB channel These circuits include the HP IB Interface and a po...

Page 236: ...isc data interface is made up of part of the DMA The DMA disc state machine handles all data transfers between the DMA buffer RAM and the ESI disc data bus except for ECC data The trans fer of each data sector is synchronized to the SOS L signal from the drive servo system The data is clocked over the bus by the data strobe DDS H from the R W system To initiate a data transfer over the disc data b...

Page 237: ...sferred The additional control signals associated with the data path control system DPAO DPRHW L DPCS L are generated by the processor and out put to the R W PCA through the data path control interface A 12 A 31 SERVO CONTROL INTERFACE The servo control interface provides the link between the controller microprocessor and the servo PCA The servo system is operated by its own micro processor so thi...

Page 238: ...iming signals for the controller PCA A 25 MHz oscillator develops the 12 5 MHz clock for the microprocessor A separate 32 MHz oscillator provides the clock signals for the riemainder of the PCA including 32 HP IB Controller 7936 AND 7937 MHz for the DMA 8 MHz for the servo control interface 4 MHz for the ECC and 500 KHz for the bus error timer A 36 INTERRUPT CONTROLLER The inter rupt controller pr...

Page 239: ...xecution of several tasks simul taneously The responsibility for coordinating the execution of the various tasks lies with the execu tive firmware which controls the interaction be tween concurrent tasks and the hardware resources A 14 they need The executive operating system is con figured at power on by the drive initialization firmware A 42 DRIVE INITIALIZATION FIRMWARE The initialization firmw...

Page 240: ...POWER ON DR I VE II NIT IAL IZATION EXECUTIVE OPERAT NG SYSTEM RPS S1U7A3e CHANNEL MODULE CONTROL STATUS CS 80 MACHIt HP IB INTERFACE DISC DATA CONTROL STATUS HP IB Controller 7936 AND 7937 A l5 ...

Page 241: ...ntained The executive also serves as the interface to the drive interrupt system The interrupt system is the primary means for synchronizing firmware A 16 operations with hardware events These hardware events communicate to the firmware the status of the separate functional hardware blocks When an interrupt occurs the executive suspends the task currently executing and services the interrupt A 44 ...

Page 242: ...936 AND 7937 The CS 80 module is idle until passed a decoded command by the preprocessor or in the case of an optimized Read or Write command the channel module When a command is received the CS 80 module obtains the hardware resources necessary to execute the command The hardware remains under the control of the CS 80 module until command execution is complete When a com mand requiring a seek is ...

Page 243: ...lerence Manual part number 5955 3462 A 18 A SO DISC CACHING The HP IB Controller PCA A6 included in XP model disc drives supports disc caching The cache improves system performance by decreasing disc response time during reads and writes The response time is decreased during reads by reduc ing the number of physical seeks needed to locate data During writes disc response is improved through the us...

Page 244: ...requires a physical seek or another write must wait until the drive completes the wtite operation in progress Both these operations require drive resources that will not be available until the write is complete HP IB Controller 7936 AND 7937 A 54 CACHE FLUSHING There are certain conditions and events which will cause the con troller to flush the entire contents of the cache RAM These conditions in...

Page 245: ...ng timing refresh and error correction A 20 A 56 CACHE DIAGNOSTICS In addition to the cache test performed as part of the power on diagnostic the XP model controller implements several CS 80 External Exerciser com mands used to support disc caching These com mands are listed in table 8 1 A detailed description of these commands and how to initiate them is in cluded in the CS 80 External Exerciser ...

Page 246: ... I WHo L I I 1 I O CONTROL r CRC BUFFER I t f CONTROL I I SOS L I I I I r T SEF L I DISC i CONTROL I DDS H HEA I DD7 DDO I I I I ADR REG I DISC INTERRUPT_ L t i J PijOCESSOR ACCESS 8 v16 I AS L CONTR 4 24 I OL I i I i I f i ADDRESS DATA 1 ECC ERROR ECC INTERRUPl 4 MHz 500 KHz BUS ERROR I TIMER BERR MICROPROCESSOR _ INDX L POR L PROCESSOR MEMORY ROM 64K X 16 RAM 8K X 16 32 MHz 12 5 MHz CLOCK GENERA...

Page 247: ... L _ _ t L _ _ _ _ _ _ _ _ P OCESSOR ACCESS CONTRPL 5 AS L 500 KHz BUS ERROR 1 TIMER BERR 12 5 MHz I INTERFACE INTERRUPT CHANNEL INTERRUPT DISC INTERRUPT ECC INTERRUPT SERVO INTERRUPT 16 I I i I ADDRESS DATA _INDX L MI CROPROCfSSOR _PO_R _L_ I V I TERRUPT 3 PRIORI TV i INTERR PT CONTROLLER DPIRQ L PF L 1 PROCESSOR MEMORY ROM 64K X 16 RAM 8K X 16 SWITCHES BUFFER 8 CONTROL A1 A5 5 I 8 8 MHz SERVO IN...

Page 248: ...6P2 A6J1 1 0101 f 2 0102 2 3 Di03 3 4 0104 4 5 EOI 5 6 OAV 8 7 NRFO 7 8 NOAC 8 9 IFC 9 10 SRQ 10 11 ATN 11 1 2 13 0105 14 0106 15 0107 16 0108 17 REN 18 19 20 21 22 23 74 25 78 27 28 29 30 NOTE SIGNAL DIRECTION IN AND OUT OF THE PCA IS INDICATED AS FOLLOWS t 0_o_o_Oi PCA A6 I IN OUT BIDIRECTIONAL J P t 0_O_O_O J 13 15 18 17 SELFTEST SWI TCH HP IB ADDRESS SWITCHES HP 18 12 J1 REAO WBITE PCA A2J2 30...

Page 249: ...IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII1111111111 Manual Part Number 07937 90903 Printed in U S A JANUARY 1987 Edition 1 E0187 FliDW HEWLETT a PACKARD ...

Search results

Summary of Contents for HP 7936

Reviews:

Related manuals for HP 7936

Brands by name

Popular brands

HP HP 7936, Support Manual

Search results

Summary of Contents for HP 7936

Reviews:

Related manuals for HP 7936

Brands by name

Popular brands