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Summary of Contents for Q2080

Page 1: ...OUAmUID PRODUCT DESCRIPTION TECHNICAL REFERENCE MANUAL Q2080 8 Media Fixed Disk Drive...

Page 3: ...81 49218 Rev A Q2080 DISK DRIVE Technical Reference Manual Prepared for QUANTUM CORPORATION by Inpsych Inc January 1984...

Page 4: ...parts Comments on all Quantum publications or their use are invited Please use the Comment Form at the back of this manual WARRANTY Quantum Q2080 disk drives are warranted against defects in materials...

Page 5: ...itioning 1 12 1 3 7 Actuator Drive Circuits 1 13 1 3 8 Servo Read and Conversion Circuits 1 19 1 3 9 Data Interface 1 23 1 3 10 Head Switching Matrix 1 24 1 3 11 Write Data Circuits 1 24 1 3 12 Read D...

Page 6: ...1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 5 4 1 Encoder PCB 5 1 5 4 2 Drive Control PCB 5 1 LIST OF FIGURES Model Q2080 Block Diagram 1 1 Model Q2080 Mechanical Layout 1 2 DC Drive Motor Curre...

Page 7: ...rmal Step Mode Timing 1 35 Burst Step Mode Timing 1 36 Index Timing 1 37 General Control Timing Requirements 1 37 Power Interface Circuits 2 3 Write Data Circuits 2 4 Read Data Circuits 2 5 Actuator D...

Page 8: ...ns Document Structure Section 1 describes the principles of operation of the drive mechanics and electronics Section 2 shows schematics of the Q2080 circuits Section 3 describes errors and media defec...

Page 9: ...are obtained from an optical encoder and scale assembly via the encoder PCB A dedicated servo surface pro vides fine track position This servo data is written on the bottom surface of the lowest plat...

Page 10: ...entire bearing shaft assembly is bonded into the base casting The shaft casting bond provides both mounting rigidity and an air tight seal be tween the shaft and mounting bore The bearing to shaft bon...

Page 11: ...and belt pulley combination Two motors are available one for 110 VAC operation and another for 220 VAC operation Both motors will operate at either 50 or 60 HZ However since the 50 HZ input will resul...

Page 12: ...eriod of one to two seconds when the motor is in the lower current limit and actuation is disabled 3 When the drive reaches 92 of regulated speed the actuator begins its recalibration sequence The mot...

Page 13: ...s channel extends from the filter to a location close to the spindle where pressure is lower than at the top of the filter This ensures a continuous flow of filtered air as soon as the disks start to...

Page 14: ...rface Read Write Electronics This circuitry provides the write current to record data and the circuits to detect recorded data Encoder PCB Servo Peak Detection This PCB contains the head switching mat...

Page 15: ...VE CIRCUITS MICRO PROCESSOR SERVO PEAK DETECTION J READ WRITE ELECTRONICS ENCODER PCB TRACK POSITION INFO RNI AND SERVO SIGNALS FIGURE 1 5 DRIVE ELECTRONICS BLOCK DIAGRAM 1 7 INDEX GEN rPARATOj INTERF...

Page 16: ...nals actuator drive signals and actuator position signals the amplifiers and comparators used to detect the encoder photo cell outputs and the AGC amplifier used to control the infrared LED drive curr...

Page 17: ...rack seeks and continue to servo on the last seeked track for greater than one second to compute the Null Current Value The Null Current Value is the current required to keep the actuator mo tionless...

Page 18: ...s in minimum voltage to the inverting input and the cell with maximum light results in maximum voltage to the non inverting input With these inputs comparator A outputs maximum positive voltage at Pl...

Page 19: ...A 8 C D P1 P2 P1 P2 P1 P2 P1 P2 P1_ P2_ I w W E FIGURE 1 9 PI AND P2 GENERATION 1 11 REV A 01 84...

Page 20: ...he direction bit During the start of the seek the microprocessor looks at zero crossings of PI and P2 to compute track crossings see Figure 1 10 at points A B C and D During longer seeks once the arm...

Page 21: ...ds the present angular position adds 64 angular steps in the direction needed 64 angular steps 90 and calls that position the new reference angle The microprocessor then sends current to the actuator...

Page 22: ...nable driver circuit This circuit prevents the heads from moving during power sequencing When the SV line is greater than 3 SV and the 12V line is on transistor QA12 turns on drawing current through R...

Page 23: ...P12 2 j 1 I J 5V DG 211 U7D 12T E81 l I FROM 7 J 6 TO COMPENSATOR i o ACTUATOR 13 ry CIRCUIT 12V CR19 R98 1 510 011 2N2907A V811 12V CR14 6V IN5233B V3 V REF R105 1K R106 510 R97 100K 1 1 8W R96 100K...

Page 24: ...pins 12 13 14 which can function as a summing block to measure loop gain Next the signal is low pass filtered at OA2 to lower mechanical resonance Finally the signal passes through OA3 getting a phas...

Page 25: ...he TDA2030 power op amp_ Because of the high gain the input of the TDA2030 also equals 6V_ V I FROM COMPENSATOR R88 100K 24V NOT ON PCB REF ONLY R89 100K CR6 CR7 IN 4002 68 1W 20 V R91 V 1 C V V iO V0...

Page 26: ...e ground end to Vd then Vc Vb and Va back to 24V When Vi 1 5V pin 4 of TDA2030 goes to 24V Va Vais a saturated transistor From Figure 1 16 Va Vb Vc Vd Ve 24V When saturated Va Ve 1 _ saturated output...

Page 27: ...s servo bursts that reference all fine positioning moves The disk is divided into S4 wedges as shown in Figure 1 18 Each of the 1172 tracks in a wedge repeats the pattern of servo bursts shown in Tabl...

Page 28: ...passes through a second stage amplifier on the main board The filtered and amplified signal is peak detected with timing controlled by the microprocessor Finally an AID converter transforms the AB pe...

Page 29: ...nd R41 and CIS ron off at about 1 0 MHz to band pass the signal SERVO HEAD CR22 26 IK CR21 I 1 8w R27 1 69K R28 1 69K r DIFfERENTIAl F LTER FIGURE 1 20 SERVO READ AMP AND FILTER CIRCUITS TO v PEAK DET...

Page 30: ...The AID conversion starts when S START NOT goes La This occurs every time the microprocessor issues a WRITE command as shown in Figure 1 23 MICROPROCESSOR CLOCK ALE I NO r I Z J ______ f____ ________...

Page 31: ...the transi tion of the MFM READ DATA line more positive than the MFM READ DATA line indicates a flux reversal was detected on the track Figure 1 25 shows the read data timing DRIVE SELECT HEADSELECT...

Page 32: ...R8 are part of the Read Write circuits and are used to isolate the Read and Write circuits from each other See paragraphs 1 3 8 and 12 r I READ r C R81 5 C R 16 CHANNEL HEAD 0 BIFOLAR WOUND R W HEAD C...

Page 33: ...n A and B 5 through 8 The logic to generate WRITE is found on Figure 2 2 location A and B 1 through 8 Transistor Q3 is the current enable switch that will turn on when current flows through R9 causing...

Page 34: ...urns on this side of the driver Current will flow from the constant current source through the transistor through CR4 through the head switch diode through coil A of the head and to ground through the...

Page 35: ...B 9 WRITE It S Ultc Q S D 2 7 7 U jB 6 3 CL R sv R31 R30 T C38 24 FIGURE 1 29 TO CURRENT SOURCE R32 CR5 I 1 J RIS R21 CRIt HEAD SWITCH MATRIX ON TRANSDUCER PCB r I foA I HlAD SElECT SWITCH L ______ J...

Page 36: ...k become forward biased Magnetic flux changes then pass by the head coil inducing current into the coil This current is coupled through the head coupling diodes and appears as small differential volta...

Page 37: ...rentiating looks similar to 2 Where signal 1 had a slow rate of change between flux changes the differentiated signal droops toward zero volts The output of the comparator should be as shown by the so...

Page 38: ...2 and Q3 When WRITE is LO WRITE is 5V which forward biases CR8 and CR16 and the head diodes The READ signal then flows dif ferentially to QA2 and Q3 which have Q4 and Q5 as current sources The current...

Page 39: ...put to the comparator The zero crossings are detected by the comparator whose output is the D input of flip flop U2F part of the droop ignore circuit The zero crossings also trigger a one shot whose p...

Page 40: ...tored in EPROM U5G 2732 4K x 8 the microprocessor sends ADDRESS via P0 data bus and P2 lower 4 bits U3G latches the ADDRESS during ALE address latch enable The 2732 puts the data to Of to 07 and PSEN...

Page 41: ...R J INDEX The circuit for the index comparator is shown in Figure 1 37 R72 and C38 make a low pass filter to eliminate high frequency noise R74 and R75 provide hysteresis according to V4 R74 V INDEX T...

Page 42: ...S74A 3 R 5V L ______ _INDE X FIGURE 1 38 INDEX SEPARATOR 5V R116 C52 2 2K 14 01 15 13 0 u8G 74LS221 3 5V SIGNAL A 1 A TRANSDUCER VV lrVVV RAW INDEX jtT 21l1 INDEX V t __________________ r_l ________ U...

Page 43: ...0 Motion occurs with receipt of a STEP pulse A HI level on this line defines the R W head motion as out or toward the edge of the disk toward track 000 STEP A LO pulse of at least 1 5 p s duration on...

Page 44: ...vel be used when writing on levels 586 through 1171 RE ZERO When this feature is enabled by installing jumper C on the control PCB and LO pulse of at least 50 J I S duration occurs on this line the dr...

Page 45: ...evel on this line indicates the RIW heads have settled on a cylinder and a read write or another seek may take place M3 When this output is selected by installing Jumper M3 on the control PCB a LO lev...

Page 46: ...als at gate U6J 1 3 17 POWER ON RESET The purpose of the power on reset circuitry is two fold First the reset will hold the processor and other circuits in a known condition reset until the logic powe...

Page 47: ...wn with inputs on the left and outputs on the right Some device symbols such as flip flops show inputs and other external connections on the top and bottom of the symbol for clarity Also the drawings...

Page 48: ...Figure 2 1 Power Interface Circuits Figure 2 2 Write Data Circuits Figure 2 3 Read Data Circuits Figure 2 4 Actuator Driver Circuits Figure 2 5 Microprocessor Circuits Figure 2 6 Servo Burst and Index...

Page 49: ...1 CONTROL SICoNAL CONNECTOR J2 ZOPIN DAiA CONNEC IOR J l PIN ENCODER AS M8L CONNECiOR 0 J4 f PIN INDf TRANSDOCER CONN CTOR J5 iD PIN DC POWER CONNEC iO R JID IOPIN ACTUATOR DRIVE tONNe C IOR J7 SPIN D...

Page 50: ...5 K 7407 iRI eRZ I IN5225B R 15 IfR3 RI7 3 0V It lsuse U4B 5 Ib 2 aov s 2K I RI t ew B S IT eRlD 7407 SIOK Q2 T2 65 b 7 R2D 5V ZK I RZ2 2K 6 75107 1IA Y RZ7 510 15 IG 74 LS74 4 U4B R2 UZJ Z S 5 3 4 2...

Page 51: ...ID 2K ZK 5 5V U2 E 5V 4 74LS74A BT20 Ap l _ 2 j osa s 10 U2 E b at q U4Fy8 R53 RSO 2 7K 5V 5V 8 5V 4 71 I U E 8 I R70 S U3E b q 2 USE 120 C3 7 LS8 O I C3 0 74LSeb I IOOPF 74L58Co IIOOPF 510 5 Yo TP5 q...

Page 52: ...Figure 2 4 Actuator Driver Circuits 2 6 3 2 1 80 20800 DG l 1I U7D 13 4 RIO 510 B 6 5 ReB 1001 i Vaw R97 lOOt I YeW R96 lOOK 1 1 Yal QIB SV lOOt 11 Vew R 5 V REf 2 NOT Ref OIllL Y elso 1 24V CRG It I...

Page 53: ...o g DSG L B P I DtRECTION It UbH L R I I SV RI14 o I I I I 12 13 4 I tK 12 0 74 LS74A r I 1 r l iW l H 3 4r ID y trCEi 1lI Us2L Al QSl 1tch4 JIS I W VREF 8 t A 1 741S 5V U H Eo t 312 G7c Ie UJ _ _ ll...

Page 54: ...b 1 2 4 K I leVY 74L 12 TPb R41 j 4 SY e I SK V8Wl UI R3q I 1 UBI I _ _ S 21 4 2K OOP t r Y 7 R42 R 43 2K 200K R44 lOOK R76 C14 1O 0k Vew 0 1 5 4 Figure 2 6 Servo Burst and Index Circuits 2 8 3 3 o v...

Page 55: ...L ____ J R 10 1 1 4G V8W RU 1 SE RVO HfAD I K I L 4 LL _ SB Figure 2 7 Encoder PCB Circuits 2 9 5B 2 Ie DAn N A 101 B 085 7eo 1 Xlv C RS CRIIe Rib RI7 I l b9f RIB 8 06K QZ 1 V6W 0 3 IlAPS HID CI2 MPS...

Page 56: ...ower and try again 3 3 INTERFACE The Q20S0 uses a SAIOOO compatible drive interface with a 4 34 Mbitlsec transfer rate General interface tim ing specifications can be found in the Q2080 Product Descri...

Page 57: ...fect area 3 5 SELF DIAGNOSTICS The Model Q2080 provides an internal seek diagnostic that will exercise all drive functions except data transfer The diagnostic is initiated by installing jumper E4 at P...

Page 58: ...eld This may be either a cyclic redundancy check CRC field of 16 bits 2 bytes or an error correction code BCC field of 24 or 32 bits 3 or 4 bytes Various gap and sync fields separate the ID and data f...

Page 59: ...ost cylinders There are two methods that the Q2080 user may employ to reduce bit shift reduce write current and write pre compensate Both methods should be used when writing above cylinder 586 The Q20...

Page 60: ...ble to it If the problem is EMI the soft data errors should go away If the soft data errors do not disappear EMI may still be causing them through a grounding problem 3 7 1 MAGNETIC COUPLING One of th...

Page 61: ...e AC power connector and ground to the base casting through the bubble clamps and cabinet If currents run through the drive from one ground to another they can induce voltages in the front end of the...

Page 62: ...ing the ground line impedance to stop pushing the current through the chassis Also the path could be opened by insulating the drive cabinet from the chassis Finally current could be shunted by connect...

Page 63: ...ey 4 3 PREVENTIVE MAINTENANCE The Model Q2080 does not require any preventive maintenance 4 4 MAINTENANCE PROCEDURES Corrective maintenance on the Model Q2080 requires certain minimum levels of techni...

Page 64: ...clamp 5 Remove the old drive belt 6 Remove the old pulley by loosening the two Allen drive set screws using a 8 Allen wrench 7 Install the new pulley Ensure that one of the set screws will match the...

Page 65: ...nstallation of the new motor is the reverse of the foregoing steps 11 Torque the mounting nuts to 22 in Ibs Replacement of Drive Control PCB 1 Remove the interface and DC power cables the drive transi...

Page 66: ...a l 0 o o a 0 r 0 or o 1 M 0 a o J2 o 0 1 a De Xl 00 woow o o D VI ooc QD JDO _ 00000 FIGURE 4 1 CONNECTOR LOCATIONS 4 4 05 og c o a a 5 I L _ _ o CI l 000 c J r l III I REV A 01184...

Page 67: ...ew loca tion 8 Install the new power transistor assembly in the reverse order of the foregoing 9 Torque the hold down screws to 22 in Ibs 4 4 2 LEVEL 2 MAINTENANCE Level 2 maintenance involves major d...

Page 68: ...e 5 4 shows an exploded view of the Actuator Sub Assembly Figure 5 5 shows an exploded view of the Spindle and Disk Sub Assembly Figure 5 6 shows an exploded view of the Head Arm Sub Assembly Figure 5...

Page 69: ...REV A 01 84 o FIGURE 51 MAJOR ASSEMB LIES 5 2...

Page 70: ...54 10226 5 75 40190 6 50 49182 Q2080 MAJOR ASSEMBLIES Description Drive Control PCB See Figure 5 12 Screw 8 32 X 38 3 Drive Assembly See Figure 5 2 Screw Flat head 8 32 X 25 3 Cabinet Sub Assembly Se...

Page 71: ...Description Belt Guard Assembly QE Power Op Amp Assembly See Figure 5 3 Shock Mounts 3 Spindle and Disk Assembly See Figure 5 5 Bubble Assembly See Figure 5 10 Filter Circulation Head Arm Assembly See...

Page 72: ...Figure 5 2 Exploded D five Assembly 5 5 REV A 01 84...

Page 73: ...FIGURE 5 3 POWER OP AMP ASSEMBLY PART NUMBER 20 20816 5 6 REV A 01184...

Page 74: ...REV A 01 84 FIGURE 5 4 ACTUATOR SUB ASSEMBLY 5 7...

Page 75: ...Item Part Number 1 75 49078 2 75 49083 3 75 49087 4 75 49141 ACTUATOR SUB ASSEMBLY Description Lower Magnet Plate Upper Magnet Plate Armature QE Airlock Assembly QE 5 8 REV A 01 84...

Page 76: ...FIGURE 5 5 SPINDLE AND DISK SUB ASSEMBLY REV A 01184 5 9...

Page 77: ...ription 1 54 10213 Screw 25 20 x 62 2 57 10090 Washer Spindle Flat 3 40 40033 Clamp Disk 4 61 49004 Disk 200 mm QE 4 5 40 40025 Spacer Common Disk 3 6 40 49132 Hub Spindle QE 7 40 49108 Index Ring QE...

Page 78: ...FIGURE 5 6 HEAD ARM SUB ASSEMBLY REV A 01184 5 11...

Page 79: ...106 54 10176 54 10229 40 49178 HEAD ARM SUB ASSEMBLY Description Arm Assembly Upper Head Spacer Arm 2 Spacer Guitar Arm Assembly Dual Head 3 Arm Assembly Lower Head Scale Mount Assembly Screw Hex Head...

Page 80: ...REV A 01 84 0 It J I FIGURE 5 7 CABINET SUB ASSEMBLY 5 13 0...

Page 81: ...m Part Number 1 59 40045 2 54 10112 3 54 10226 4 48 40253 CABINET SUB ASSEMBLY 75 40190 Description Cabinet Screw Phillips Head 6 32 x 19 4 Screw Flat Head 8 32 x 25 3 Plate Molded Face 5 14 REV A 01...

Page 82: ...FIGURE 5 8 AC DRIVE MOTOR REV A 01184 5 15...

Page 83: ...18GA Yellow Green AC Ground Wire 18GA White AC Capacitor llO VAC Capacitor 220 VAC Motor Drive 110 VAC Motor Drive 220 VAC Pulley Motor 60 HZ Pulley Motor 50 HZ Strap AC Motor Ground Belt Drive 60 HZ...

Page 84: ...FIGURE 5 9 DC DRIVE MOTOR ASSEMBLY REV A 01184 5 17...

Page 85: ...MOTOR ASSEMBLY See Note 1 Description Shield DC Motor PCB DC Motor Control Bracket PCB Sinking Nut Jam 1Iz 20 Lockwasher IT liz Spindle Housing Assembly Rotor Stator Assembly Screw Flat Head 8 32 x 38...

Page 86: ...8 REV A 01 84 FIGURE 5 10 BUBBLE SUB ASSEMBLY 5 19...

Page 87: ...40058 46 40046 51 40163 38 40002 43 40155 51 40085 BUBBLE SUB ASSEMBLY Description Bubble Injected Gasket Assembly Bubble Seal Clamp Bubble Short Ground Clamp Bubble 4 Seal Actuator Label Shield Filte...

Page 88: ...REV A 01184 CJ ffi3 RI clODe FIGURE 5 11 ENCODER PCB ASSEMBLY 5 21 o...

Page 89: ...12 16 19 23 20 1 03 00104 IUF IOOJo C5 S 03 16009 33PF IOOJo INDUCTORS LI 2 3 04 16506 FERRITE BEAD TRANSISTORS QI 4 5 16 14001 2N2222A Q2 3 16 00000 MPS HIO DIODES CRI 16 21 24 16 14012 IN414S ITT DI...

Page 90: ...FIGURE 5 12 DRIVE CONTROL PCB ASSEMBLY REV A 01 84 5 23...

Page 91: ...1 1I4w 5 RI3 01 12012 2K 1I4w 5 R56 01 12202 1 0K 1 8w 1 R14 01 12015 5 1K 1I4w 5 R57 01 12002 51 1I4w 5 R15 01 01620 162 1I8w 1 R58 59 01 12006 510 1I4w 5 R16 01 12005 330 1I4w 5 R6O 61 01 12201 249...

Page 92: ...2K 1I4w 5 R92 01 12245 lOOK 1ISw 1 R1l7 01 04022 4O 2K 1ISw 1 R93 01 1200S lK 1I4w 5 RllS 01 12012 2K 1I4w 5 R94 01 30003 6S lw 5 R119 20 01 1200S lK 1I4w 5 R95 97 01 12245 lOOK 1ISw 1 R151 01 12012...

Page 93: ...30 03 16208 39pF 5070 MICA C69 03 00103 01 uF 80 X7R Cer C32 33 00103 01uF 10 X7R Cer C70 72 03 16201 4 7uF 10 35V C35 03 01220 22pF 5070 NPO Cer C73 74 03 02104 O luF 80 20 C36 37 03 01101 OOpF 5070...

Page 94: ...002 CR1S 19 16 14012 IN4148 ITT only CRlO 16 14012 IN4148 ITT only CR20 16 20003 II DQ03 Schottky CR11 16 1400S INS22SB 3 0V Zener INTEGRATED CIRCUITS UIC 13 18204 NES92 Video Amp U4D 13 1800S 74LSOS...

Page 95: ...208 MC 1408L8 DAC 16P U3H 13 18009 74LS74A DUAL FF U8G 13 18043 74LS221 14P U3J 13 18206 74110A DUAL LINE U8H 13 18211 LM311 N P 8PIN DUR 14P U4B 13 18004 7407 HEX BUFF 14P U9D 13 18243 LM324 U4C 13 1...

Page 96: ...THIS PAGE INTENTIONALLY LEFT BLANK...

Page 97: ...earning o InstallIng 0 Sales o Fully Covered DWell o Well OrganIZed o Clear Illustrated o Reference o Maintaining 0 Operating What is your overall rating of this publication What is your occupation o...

Page 98: ...Fold TTN Technical Publications Fold I a Je nere umy QUANTUM CORPORATION 1804 Me Carthy Blvd Milpitas California 95035 PLACE FIRST CLASS POSTAGE HERE...

Page 99: ...Publication Number 81 49218 Rev A...

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