burroughs B 9489, Technical Manual

Page 1: ...ssion of the Patent Division This material is furnished for Burroughs Field Engineering Personnel and is not furnished to customers except under special License Agreement THIS DOCUMENT IS THE PROPERTY OF AND SHALL BE RETURNED TO BURROUGHS CORPORATION BURROUGHS PLACE DETROIT MICHIGAN 48232 F E Dist Code Printed In U s America December 1979 1 2 3 INTRODUCTION AND OPERATION FUNCTIONAL DETAIL CIRCUIT ...

Page 2: ...accepted for any consequences arising out of the use of this material The information contained herein is subject to change Revisions may be issued to advise of such changes and or additions Correspondence regarding this document should be addressed directly to Technical Documentation Department Technical Information Organ ization Burroughs Machines limited Cumbernauld Glasgow Scotland G680LN ...

Page 3: ...v 5 1 5 2 Retain this PCN as a record of changes made to the basic publication FIELD ENGINEERING PROPRIETARY DATA The information contained in this document is proprietary to Burroughs Corporation The information or this document is not to be reproduced shown or disclosed outside Burroughs Corporation without written permission of the Patent Division This material is furnished for Burroughs Field ...

Page 4: ...hru 4 10 Retain this PCN as a record of changes made to the basic publication FIELD ENGINEERING PROPRIETARY DATA The information contained in this document is proprietary to Burroughs Corporation The information or this document is not to be reproduced shown or disclosed outside Burroughs Corporation without written permission of the Patent Division This material is furnished for Burroughs Field E...

Page 5: ...AGES Page Issue Title PCN OOI ii PCN OOI iii thru iv PCN 002 v thru vii PCN OOI viii Blank 1 1 thru 1 12 Original 2 1 thru 2 25 Original 2 26 Blank 3 1 thru 3 9 Original 3 10 Blank 4 1 thru 4 10 PCN OOI 5 1 Original 5 2 PCN 002 5 3 thru 5 4 Original 6 1 Original 6 2 Blank iv ...

Page 6: ...E PAGES Page Title ii thru vii viii 1 1 thru 1 12 2 1 thru 2 25 2 26 3 1 thru 3 9 3 10 4 1 thru 4 10 5 1 thru 5 4 6 1 6 2 Issue PCN OOI PCN OOI Blank Original Original Blank Original Blank PCN OOI Original Original Blank ...

Page 7: ...1 7 1 7 1 7 1 8 1 8 1 8 1 9 1 9 1 9 1 10 1 10 1 10 2 1 2 1 2 1 2 2 2 2 2 2 2 3 2 4 2 4 2 4 2 4 Section 2 Continued Stepper Motor Drivers Stepper Motor Register Stepper Motor Positioner Clock Clock Control Direction Control Position Settled Head Select Head Load Solenoids and Tiler Index and Sector Pulses Write General Write Clock Write Data Encode Unit Selection Write Inhibit Write and Erase Drive...

Page 8: ...10 Triple 3 Input NAND Gate 1 16 Common Electronics 1 11 3 7 SN7420 Dual 4 Input NAND Gate 1 17 Block Diagram 1 12 3 8 SN7426 Quad 2 Input High Input Voltage Interface NAND Gate with Open 2 1 Positioner Mechanics Top View 2 1 Collector Output 2 2 Carriage Side View 2 2 3 9 SN7438 Quad 2 Input Interface NAND 2 3 Positioner Electronics Block Diagram 2 3 Gate with Open Collector Output 2 4 Schematic ...

Page 9: ...m TIL 81 or 2B50B Silicon Photo Transistor 3 9 4 6 Incorrect Waveforms Delay Une 300ns 3 9 4 7 Unstable Waveforms High Power Transistor 2N6055 or 4 8 Data Window Adjustment TIP640 3 9 5 1 Stepper Motor and Carriage Assembly Backlash Nut Adjustment 4 2 5 2 50 60Hz Conversion Locking Plate Clearance 4 3 5 3 Connection Block Diagram LIST OF TABLES Page Table 1 1 Logic Interface Between Host System 1 ...

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Page 11: ...r each side The heads are mounted on a carriage that is movable so that the heads are positioned to one of the 88 concentric tracks on the disk Movement of the carriage is controlled by a stepper motor connec ted to a lead screw Writing or reading is accomplished with the head that is in contact with the disk To ensure contact a press Ute pad presses the disk against the head from the opposite sid...

Page 12: ...o the correct track and then waiting until the correct sector arrives under the head This enables any sector to be accessed indepen dently and is known as RANDOM ACCESS Random access permits selective reading or writing of records within a file without having to read or write the entire file as is the case with magnetic tape Random access makes the unit ideal for memory expansion of small computer...

Page 13: ... the disk when the door is closed 3 Engages the disk with the spindle by means of the annulus 4 The index sector transducer provides timing pulses for use of the controller 5 The write inhibit transducer detects disks which are write protected 6 Provides a mounting for the upper pressure pad solenoid 7 Swi ches the motor ON when the receiver lowers and OFF when the receiver lifts 8 Lifts the upper...

Page 14: ...he disk is energised allowing the pressure pad to push the disk against the selected head 5 revolu Figure 1 5 Carriage Assembly tions after the read or write operation the pressure pad is disengaged if no further commands are received This reduces disk and head wear MAGNETIC HEADS The magnetic heads contain 2 windings one for writing and reading and one for erase Writing is achieved by passing cur...

Page 15: ... 0052 Figure 1 7 Magnetic Head Layout Figure 1 9 Track Format Upper Side OPERATION FLEXIBLE DISK MINI DISK Data is recorded on the flexible disk on 88 concentric tracks The lower magnetic head is offset relative to the upper magnetic head in order to make space for the press ure pads and the distance of the tracks from the center of the disk is different on the upper and lower surface refer to fig...

Page 16: ... it does not require a separate clock track and it enables approximately twice as much data to be stored for the same flux change density M F M consists of a flux change at the edge of a data cell for a zero and a flux change in the centre of a cell for a one If a zero follows a one a fluxchange is not recorded This is recognised and corrected during read and the fluxchange density is minimised 18...

Page 17: ...nduce an alternating current into the coil of the head This is amplified filtered for noise and digitised The digitised read information from the selected unit is applied to the common electronics portion of the PCB On receiving READ ENABLE from the controller an oscillator locks onto the data providing a data sampling window and a READ CLOCK The purpose of this oscill ator phase locked loop is to...

Page 18: ...5 bl EN TWO SECTOR 32 SECTOR HOLES 0 05 INCH DIAMETER Figure 1 13 Disk 2 Always keep the disk in the envelope in the ten pack box 3 Always return the empty envelope to the ten pack box 4 Treat the disk as fragile and easily damaged 5 Use a felt tip pen to write on the disk label a pencil or ball point pen will damage the disk 6 DO NOT touch the magnetically coated brown surfaces 7 DO NOT leave the...

Page 19: ...rted the wrong way the File Op indicator will not illuminate Disk Extraction 1 Wait until the system has completed processing with the disk 2 Press Door Release Bar on the unit 3 Extract the disk 4 Immediately return the disk to its envelope 5 Close the door of unit ELECTRICAL INTERCONNECTIONS HOST TO MASTER INTERFACE Table 1 1 contains the logic interface signals between the host system and the m...

Page 20: ...E OPERATIONAL is set to logic 0 if a disk is in the drive the disk is rotating within 10 of full speed and the positioner has recalibrated to track 00 If FILE OPER ATIONAL is set to logic 1 all signals from the drive are invalid POSITIONER SETTLED is set to logic 1 when 1 FILE OPERATIONAL is set to logic 1 2 The positioner is in motion after a SEEK signal or 3 A head solenoid is in motion after a ...

Page 21: ...w l a WRITE ENCODf 12V 24 5 GND 12V z W N 0 C a 0 C J C Z J a w C I w a C a I 2 a a c LL C 2 2 a LL Figure 1 16 Common Electronics N RD EN ILL ADD FILE OP WRITE INHIBIT POSITION SETTLED SECTOR INDEX MFM RD SLAVE CONNECTED ADD 1 THRU 64 SEEK WRITE ENABLE UNIT SELECT MFM WRITE READ ENABLE HEAD SELECT VOLTAGES RD EN ILL ADD FILE OP WRITE INHIBIT POSITION SETTLED SECTORI INDEXI MFM READ ADD 1 THRU 64 ...

Page 22: ...DRESS SEEK SECTOR INDEX SEEK RD EN WRT EN HD SELT POSITIONER LOGIC REV COUNTER POSITIONER SECTION POSITIONER DRIVE IND SEC AND UP SPEED LOGIC PRESS PAD LOGIC HD SELT EXTER NAll OU CHASSIS I r I t I SOLENOID I I ______ J I I _ __ J C O M M ON EL EC T R O NIC S S EC T IO N jRo W R r S EC rI O N r _W_R_T_D_A_T_A _______________ I I DATA CLK RD DATA CLOCK SELECTOR MFM DECODER CRYSTAL OSC MFM ENCODER I...

Page 23: ...EEK pulse is sent to the unit from the controller The new address is compared with the present address and the stepper motor is driven forwards if the new address is higher and backwards if the address is lower When the track requirement has been reached a delay is started which permits the carriage to settle At the end of this delay POSITION SETTLED is sent to the controller infonning it that rea...

Page 24: ...adjusted in relation to the lower head along the disk radius Both heads can be adjusted by turning the stepper motor on its mounting A vane fitted to the lateral arm is aligned with the track 00 transducer when the carriage is at track 00 MAGNETIC HEADS The magnetic heads are offset in relation to each other with the lower head nearer the spindle than the upper head to give the space needed for th...

Page 25: ...in S The up to speed UTSF signal is low providing a low on IC2S pin 1 This causes pin 3 to be high and pin 6 to be low holding the File Op latch reset IC13 pin 6 is low giving a low File Op signal to the common electronics The File Op indicator is not illuminated When the disk is inserted and the receiver is lowe red the disk turns and index sector pulses are generated When the correct disk speed ...

Page 26: ...urpose of the Current Address Counter is to give information to the address comparator of the cylinder that the heads are currently situated on The counter steps up and down as the carriage steps towards or away from the spindle Calibration of the counter and carriage occurs when a disk is first inserted and subsequently whenever track 00 is seeked This permits software recovery if the counter and...

Page 27: ...04911 3 _s to 14473532 F _ N7410 14473540 J SN74Z0 14473S6 0 JC N7474 1447360 S 43 8 326 8284 A 9308 T 932 4 1878 042 14467062 1878803 10 47 XOWIH to A7 l _ IH R T N 7 AI peS TIME oUTI 9 01 KO b Q T O ao A7xD 1XCC 10 37 o O RTN 7 AI PO ...

Page 28: ...3 TP 7 4 pin9 pin 8 pin 5 pin 6 0 0 1 0 1 1 0 0 45 0 1 0 1 1 0 0 1 1 0 0 1 0 1 0 46 1 0 0 1 0 1 0 2 0 1 1 0 0 0 1 47 0 1 1 0 0 0 1 3 0 1 0 1 1 0 0 48 0 1 0 1 1 0 0 4 1 0 0 1 0 1 0 49 1 0 0 1 0 1 0 5 0 1 1 0 0 0 1 50 0 1 1 0 0 0 1 6 0 1 0 1 1 0 0 51 0 1 0 1 1 0 0 7 1 0 0 1 0 1 0 52 1 0 0 1 0 1 0 8 0 1 1 0 0 0 1 53 0 1 1 0 0 0 1 9 0 1 0 1 1 0 0 54 0 1 0 1 1 0 0 10 1 0 0 1 0 1 0 55 1 0 0 1 0 1 0 11 0...

Page 29: ...ED RAM SLOW CLK I6 emS FAST CL K S 4 mS 015 o t t I OCATION A TP 7 3 VE9 R82 E8 200 B c I 81 all E I C9 I L ______ 24V RTN _________________________________________________P O S_T I A 0l y A7 POS Lr G A7 L 1 P O sST U DI ICs A SN7400 C N7 04 O N740S E S n4 0 J SN7414 Mo 9601 Z 47427 14473516 14A73532 2 OOi68 14473540 14473 07 19017102 2 00492 XSTR E N 3es C r E AT IOD S A TY E 23 e 1 43 3 18794e28...

Page 30: ...BE REDUCED Figure 2 6 Stepper Motor is ramped from 147 steps sec to 222 steps sec to pennit for the extra time needed for acceleration of the rotor and carriage The clock is made up of two multivibrators IC39 and IC40 connected to trigger each other When the POSITIONER CLOCK ENABLE signal goes high IC39 is triggered generating an 800 ns Positioner Clock pulse at pin 8 TP 6 5 The trailing edge of t...

Page 31: ...age must move away from the spindle 2 File Op low This occurs from power up or when a disk is removed until a disk is inserted and the heads have reached track 00 POSITION SETTLED The Position Settled signal gives information to the controller that the heads are settled on their new position and the pressure pad is engaged so that read or write operations may start Refer to figure 2 S PSK triggers...

Page 32: ...n 5 high if address is illegal IC32 pin 9 low if upper head high if lower head IC33 pin 6 low 1C43 11 1 2 and 5 low IC12 pin 4 low for 115 mS TP 6 3 low TP 6 2 high If TP 6 1 HI TP 8 3 high IC24 pin 8 low TP 8 3 high If TP 811 high TP 8 3 low IC24 pin 8 high 1 Clock pulse occurs Pulse on 6 5 and 516 Counter counts up or down 1 position Stepper register counts 1 up or down Carriage moves 1 track If...

Page 33: ... of ICI9 INDEX is connected to the clock input pin 1 therefore on each revolution the data is shifted one position and Serial in is shifted in Pin 10 output will stay high keeping the solenoids de energized until a SEEK occurs A SEEK pulse sets flip flop IC22 causing pin 6 to go low this causes a low on the clear input of ICI9 resetting all flip flops and making pin 10 low This enables pins 11 and...

Page 34: ...Ie it SI l7 OO SN740 7405 7410 N747 M 9601 YSN14 Et 0 0 1 iN4313 14473516 14473532 600168S 14473540 4473607 1 o017 02 e7 1764 fU6S77 4467252 N SV ...

Page 35: ... 10 13 3 7 04 35 i1O 3 CS 8 02 J O 2 6 2 21 1 2 c 4 7 55 40 3 4 6 C6 28 5 2 05 a C3 3 3 4 6 02 30 2 12 6 C7 32 1O i3 9 06 19 2 W 7 les SN7400 144735 6 D SN7 OS 260016 35 G S 7 26 18789057 1 7474 14473607 1 SNi4132 26006726 4 iJ601 19017102 I 9602 14467047 DiCDES TYPE 25 20052981 TP 5 4 84 IC 47 1 5i5 57 11 SV RI50 1 3 C48 c A8 _ 220 I JJF YII SV POWER ON RESET M D I_C3 __________________ _________...

Page 36: ...Frequency SECTOR pulses TP 8 4 Pulses occurring during the 4ms are decoded as INDEX pulses TP 8 5 UP TO SPEED refer to figure 2 9 When the unit is powered on UTSF is held reset for 300ms minimum by C48 holding a low on IC22 pin 13 This is to prevent the flip flop being set by spurious pulses occurring as the unit is powered on When a disk is inserted and the receiver lowered the drive motor is swi...

Page 37: ...ritten on the disk In addition during Write the erase current must be switched on to erase a guard band on each side of the data This prevents noise pick up from previously recorded data in the event of a slight head misposition when reading the data back Writing over previously recorded data destroys the old data due to the fact that the disk is saturated with magnetic flux Refer to figure 2 11 f...

Page 38: ... 3 WRT DATA TP9 1 IC49 PIN 5 IC49 PIN 8 IC48 PIN 8 ONES GATE IC48 PIN 8 ZEROS GATE TP9 4 MFM WRT o o lJ U I I I I I I I I n n U n cell for a zero and a pulse at the center of a cell for a one Where a zero follows a one the zero pulse at the beginning of the cell is omitted Gate IC46 pin 8 gates the ones bits Gate IC48 pin 6 gates the zero bits NRZ data is clocked into flip flop IC49 pin 5 on the l...

Page 39: ...S N 0 N XTALI OJ 0 1500 00 KHZ 01 51 A TP9 S 2 ICs A SN7400 F SN7420 SN7474 14473516 1447 565 14473607 TP 10 2 t 43 5V WRT elK I AS WFM W T l A8 tc s 0 s en tc 0 00 0 s s X a o s t j t j 1 t j 1 r s o s s s CIl 1 P N c t ...

Page 40: ...below 32 both ADD64 and ADD32 will be false This causes the output of gate IC3 to go false The collector load for Q4 is then R19 to ground This allows the higher current to flow through Q4 and thus through Q5 For cylinder address 32 or greater ADD32 or ADD64 wIll be true This permits the output of gate IC3 to float R19 then forms part of the collector load of Q4 thus reducing the current flow thro...

Page 41: ...34 lpIDJ 2 ST 3 P7 P7 1 A L2 6 L2 elK SECT 270 I 18 0 s OV C T Tk 3 10 5 I 3 t 2 3 I M _M_ R _ ________________ __________________________ T 4 T I I SILL ADD SFIl W t A FIrr 92 ZI tI STER M _ t _2 AI BD I4 t A POSN S TTO 6Ql 15 l us 1ID ILL ADOl 2 H RTN 41 14 r 61 FILE opt H e N h 4 WIHI 13 H r rr 9 oP 8 S T4 POS JI 37 2J 23 3 39 ILL Aoo T i rr ADD I 6 01 j 4 30 _ D 26157 131 A t D40157 32 AD 6 67...

Page 42: ...052981 03 C 7534 U 63241 0 F MATCHEO 19795716 Tl CI QIJACS QQ ERASE DRIVER 02 til 12V CO G CI 0 N RS 61 0 I WRT ENI 3 00 6 81 0 330 Tl Tl 200 CI CD CIl B2To IJJF R9 RIO s r CI 01 c G o CD E3 ov 121 12K s e Q RIS A2 DATA 5 0 til 5V 12v s ce I IK B8 0 DATA E t 1 RIB B2 0 r 31 3 s 5 0 MMFMWRT TP2 C2 IK s 2C2 R 3 C2 e OV 11 5 IK5 I V R20 r v C2 6 C7 620 NOTE II NOiCATES GRD REFERENCE TPI3 _ON CRClJiT ...

Page 43: ... noise pulse at the output of IC8 will cause IC6 pin 8 to float for the duration of the noise pulse The noise pulse will be too short to permit C8 to charge to 5 5 volts Therefore Q16 will not be switched on and the noise will have no effect on MFM RD DATA DECODE GENERAL The signal MFM RD is sent to the common electronics from the master unit and the slave The function of the LON PASS FILTER DIGIT...

Page 44: ...c F2 IK FI 1l c N 01 XI R35 GI T I J en 11 2 c Cii s 1l ov 5 3 o Cii C s R46 RSIJ2 e S o I F2 til II 51 1l Sv t II C ov Q II j r R29 E2 RSS J2 12V SV II C I2V 12V s J s s e co CIS ov n 02 J2 e OoIJJF O J JF 3 C s IC 017 c G SN7426 18789057 OV OV A e J SN7474 14473607 GI U 1 IA133C 20100582 JJA710C 11272077 OV XSTR TP21 JI MMFIIA Ro I C3 A TYPE AK 11095924 DI OFS A TYPE 25 20052981 C IN7S 11263241 ...

Page 45: ...e natural frequency is 750 KHz this is adjusted with RV4 The natural frequency can be varied by the data by 6 Refer to figure 2 21 The phase locked loop compares its frequency with the input data pulses and adjusts itself so that the output tran sition occurs midpoint of the input pulse The speed of correction is determined by Rl12 and C80 READ ENABLE DELAY Before RD EN goes true the low level res...

Page 46: ...7047 68 18791798 1 2W 11095924 20052981 10806206 IiIV3 P3 READ ENABLE DELAY SV __ Vr rv 5V I SK I RS2 L f S3 r Aw i OV 04 RS4 C762200PF Rill C78 P4 P4 RV4 R4 R3 t 5K IK o lJJF 16 4 C12P4 TPI9 V P4 RI13 PS IIC 61 W Q4 PHASE LOCKED LOOP 3 0 TP 11 6 Pl RI02 04 lK 12V R91 N2 RII4 OS 681 2W RIOI 03 IK8 CI02 03 O I F IOO 03 2K sv R97 as IK TP 10 6 3 TP 11 4 P3 RD eLK I A7 5V ...

Page 47: ... BACK VOLTAGE I I I I l PEAK SHIFT I I I I o zeros and any pulses occurring outside are taken as ones The mark space ratio of the data window waveform is 39 that is 39 of the time is spent looking for zeros and 61 looking for ones This is to counteract the effect of peak shift affecting the ones when a zero pulse is omitted following a one see figure 2 22 Peak shift is caused by the effect of puls...

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Page 49: ...Quad 2 lnput NAND Gate 3 3 2600 4911 SN 7402 Quad 2 lnput NOR Gate 3 4 14473532 SN 7404 Hex Inverter 3 5 26001685 SN 7405 Hex Inverter with Open Collector Output 3 6 14473540 SN 7410 Triple 3 lnput NAND Gate 3 7 14473565 SN 7420 Dual 4 lnput NAND Gate 3 8 18789057 SN 7426 Quad 2 lnput High Input Voltage Interface NAND Gate 3 9 14473581 SN 7438 Quad 2 lnput Interface NAN 0 Gate with Open Col lector...

Page 50: ...E 1 c A B C HI HI LO OR HI LO ttl c LO HI HI LO LO HI Figure 3 2 SN7400 Quad 2 Input NAND Gate PIN DESIGNATION PIN DESIGNATION Vee SCHEMATIC GRD TRUTH TABLE SCHEMATIC TRUTH TABLE A B C LO LO HI A B OR HI LO LO LO HI LO HI HI LO A LO B HI c LO HI Figure 3 3 SN7402 Quad 2 Input NOR Gate Figure 3 4 SN7404 HEX Inverter ...

Page 51: ...N7410 Triple 3 Input NAND Gate Qrcuit Detail 0 LO HI HI HI HI PIN DESIGNATION SCHEMATIC TRUTH TABLE i3___rE A B C 0 HI HI HI HI LO HI HI HI OR HI LO HI HI HI HI LO HI HI HI HI LO LO LO D __ E ALL HI LO LO LO ANY LO HI Figure 3 7 SN7420 Dual4 Input NAND Gate Vee SCHEMATIC PIN DESIGNATION A 7 GRD TRUTH TABLE B E LO HI HI HI HI HI C 1 c HI HI LO OR _ HI LO FLOATING t c LO HI FLOATING LO LO FLOATING F...

Page 52: ... triggers the output goes low as soon as both inputs are above approx 1 7V and goes high if any input goes below approx O 9V Figure 3 10 SN74132 Quad 2 Input NAND Gate Sclunitt Triggers PIN DESIGNATION 7 SCHEMATIC GRD TRUTH TABLE i L D A iB C D HI HI HI LO LO LO LO HI HI LO LO LO LO HI LO LO LO LO HI LO Figure 3 11 SN7427 Tripple 3 Input NOR Gate PIN DESIGNATION TRUTH TABLE SCHEMATIC A B C HI HI L...

Page 53: ...ering until the timer has timed out The flip flop is triggered as the clock goes high setting if Data is high resetting if data is low SN7474 Dual D type Flip Flop ITT9601 50 Retriggerable monostable multivibrator Figure 3 13 SN7474 Dual D type Flip Flop Figure 3 14 ITT9601SD Retriggerable Monostable Multivibrator A B C R rl Vcc 9602 RESET o 6 ii 5V PIN 16 OV PIN 8 14 10 9602 The multivibrator is ...

Page 54: ... the second Figure 3 16 8284 Hexadecimal Up Down Counter ENABLE1 ENABLE2 A1 16 B1 18 9308 C1 20 01 22 Both Enable 1 and Enable 2 must be low to latch the 2 outputs in the same state as their respective 1 inputs If either Enable goes high the outputs are unaffected by the inputs AIowan Reset resets the 4 latches to low regardless of the enable lines Figure 3 17 9308 Dual 4 bit Latch A1 10 9 A2 11 A...

Page 55: ...er Figure 3 21 710 High Speed Differential Comparator 16 CLEAR A2 82 C2 CLOCK A1 81 1 OV Vee 9 SERIAL 02 E2 INPUT 8 PRESET ENABLE 8 The 7496 can be used as a serial to parallel converter a parallel to serial converter or a 5 bit storage register A LOW on Clear will reset the flip flops so that A thru E2 are low provh ad that Preset enable is low The flip flops can be preset by applying an input to...

Page 56: ...entre frequency of the oscillator is determined by the capacitance and voltage between pins 5and 6 It can be further modified up to 15 internally by the output of the Phase Comparator via the limiter 2 Phase Comparator Only 2 inputs of the phase comparator are used the other 2 being AC coupled to general One input has data bits the other is wired externally to the output of the V C O The phase com...

Page 57: ...ed light source shines on the lens the transistor switches on giving alow level into the circuit With no li ht the transistor is off giving a high level in Figure 3 2S TIL 81 or 2BSOB Silicon Photo Transistor I _N 4 11 300ns The delay line is an LC Network which delays any input pulse or AC waveform by 300 nano seconds I I I I I IN J r OUT I I j 300ns Figure 3 26 Delay line 300ns EMITTER BASE COLL...

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Page 59: ...the alignment disk is known as an alignment check disk and may be used for all other adjustments requiring an alignment check disk If the alignment disk is opened in a controlled en vironment 45 5 RH and 68 F 5 F or 20 C 0 5 C and never removed from that envi ronment the 6 minutes time limit does not apply and the alignment disk may be used to perform track to track alignment of the lower head for...

Page 60: ...each time Adjustments Backlash Nut Adjustment This adjustment should only be required when the carriage block is removed or replaced The backlash nut pre loads the carriage block against the lead screw of the positioner If the back lash nut is set too slack the positioner will have too much backlash If the backlash nut is set too tight the positioner will have too much friction Either of these con...

Page 61: ...he alignment meter head lead into the lower head socket CONN 6 of the unit 3 Insert an alignment check disk into the unit with the label away from the blue release bar 4 Seek track 00 Head 1 Refer to Alignment Track Selection using B SO MTR 5 Seek track 43 head 1 and continue sending seeks to this address Refer to Alignment Track Selec tion using B SO MTR 6 Note the meter reading If it is greater ...

Page 62: ... stepper motor in either direction that is clockwise and counter clockwise until the tri bits present indicator illuminates 11 Looking from the rear of the unit rotate the stepper motor clockwise until the tri bits pres ent indicator is exting ished 4 4 12 Rotate the stepper motor slowly counter clock wise until the tri bits present indicator illu minates the light must remain on continuous ly and...

Page 63: ...ckage Once the package has been opened the alignment must be performed within 6 minutes Head 1 Fine Adjustplent Using Sealed Alignment Disk 35 Connect the alignment meter head iead into the lower head socket CONN 6 of the unit 36 Install the stepper motor adjusting tool P N 1880 7909 onto the body of the stepper motor 2102141 001 37 Remove thtt alignment disk from its sealed container and insert i...

Page 64: ...nment Track Selection using B 80 MTR 5 Seek track 40 head 1 and note the meter read ing refer to Alignment Track Selection using B 80 MTR 6 Adjust RVI until the meter readings obtained from both heads are equidistant about 150 sec and within the range of 150 24 JA sec 7 If the adjustment for steps 4 to 6 cannot be achieved then the upper head arm should be realigned as detailed under Track to Trac...

Page 65: ...bits are pres ent 46 40 49 37 52 34 55 31 refer to Alignment Track Selection using B 80 MTR Loosen the mounting screws of the track 00 transducer PCB If tri bits are present at a track higher than 43 move the track 00 transducer PCB towards the spindle If tri bits are present at a track lower than 43 move the track 00 transducer PCB away from the spindle 2102141 001 7 Tighten the mounting screws 8...

Page 66: ...eform shown in figure 4 5 becomes unstable as shown in figure 4 7 a 6 Counting the number of turns adjust RV4 until the waveform becomes unstable as shown in fig ure 4 7 b 7 Adjust RV4 in the opposite direction by the number of turns divided by 2 The waveform should be as shown in figure 4 5 with RV4 ad justed to its mid range position a b Figure 4 7 Unstable Waveforms OTM 1000 or 80M 1250 1 Conne...

Page 67: ...ng points on the master board FROM TO PIN 11 CONN 2 PIN 31 CONN 2 TP 10 2 PIN 16 CONN 2 3 Select Drive 2 Slave using the MTR or Disk Exerciser 4 Set up the DTM 1000 as follows PROBE 1 TEST POINT 1 SLOPE A I TP 11 2 I VE FUNCTION WIDm 5 Adjust RV2 until a meter reading of 1 24 O l S is obtained 6 Set up the DTM 1000 as follows PROBE TEST POINT SLOPE B TP 11 2 VE C TP 11n VE FUNCTION INTERVAL BC 7 A...

Page 68: ...p the BDM 1250 as follows PROBE TEST POINT B TP 11 2 C TP lin FUNCTION TIME B C 4 10 SLOPE VE VE Adjustments 7 Adjust RV3 until a meter reading of 0 62 O 051 S is obtained 8 Remove all jumper leads and re connect the master slave interconnecting cable connector 2 ...

Page 69: ...id is energized there should be clearance between the lifting arm and the STEPPER MOTOR LOCKING PLATE pressure pad Fit head lifting plate STEPPER MOTOR AND CARRIAGE Removal Disconnect stepper motor from PCB Remove backlash nut locating plate Remove screw and washer from the end of the lead screw Remove the three screws securing the stepper motor Carefully screw the lead screw out of the carriage a...

Page 70: ... component using the MTR procedures RECOVERY OF CONTAMINATED DISKS Contaminants may cause loss of data bits by damaging the surface of the disk A contaminated disk may transfer the contamination to the drive and affect its ability to transfer data correctly If a disk has been mishandled and contamination has occurred the following procedure may be followed 1 Remove the contamination from the disk ...

Page 71: ...P9 4 POS CLK POSITIONER CLOCK IC39 PIN a POS CLK EN POSITIONER CLOCK ENABLE TP 6 2 POSN SETT POSITIONER SETTLED 1C44 PIN 12 POS STOP POSITIONER STOP ICPIN POS TIME OUT POSITIONER TIME OUT 1C33 PIN 6 PSK POSITIONER SEEK TPa 2 RDCLK READ CLOCK IC60 PIN 13 RDDATA READ DATA TP 10 6 RDEN READ ENABLE TP 10 5 RTN RETURN LINE FOR INTERFACE SIGNALS PQS SECTOR SECTOR PULSES TPS 4 SEEK SEEK COMMAND PQa SEEK ...

Page 72: ...ITE INHIBIT TRANSDUCER FILE OP INDICATOR WRITE INHIBIT INDICATOR UPPER HEAD SOLENOID LOWER HEAD SOLENOID L ___________________________________________J r SLAVE UNIT SLAVE ELECTRONICS INDEXI SECTOR TRANSDUCER TRACK 00 TRANSDUCER FILE OP INDICATOR WRITE INHIBIT INDICATOR I 110VAC _ __ rxH MDRO TOR VE I M l11l STEPPER MOTOR LOWER HEA 1 SOLENOID _1 _________________ ______________ 1 Figure 5 3 Connect...

Page 73: ... the pulleys The spring should be fitted correctly to the pressure pad arm The pressure pad arm should be on the correct side of the solenoid lever All plugs should be correctly fitted All PCB mounting screws should be tight For a master unit connect the lIb cable DC power cable and AC power cable to the host system For a slave unit connect the 40 way cable from master to slave and connect the AC ...

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Page 75: ...78 2 28 78 NO R2141 REV 000 STYLE MODEL PAGE A B 9489 1 OF 1 TOP UNIT NO SEE BELOW DATE 28 February 1978 TITLE A C CONNCETOR INDICATOR LAMP FAILURE MAINTENANCE TEST ROUTINE HEAD BONDING INDEX TO DATA BURST ADJUSTMENT TRIBIT ALIGNMENT METER DOCUMENTATION HEAD LEAD RELIABILITY HAZARD MODIFIED ANNULUS AND STUD F E Dist I BS Codc L __ o THIS CHANGE IS A RESULT OF FIELD REPORTING FOR LIBRARY BINDER 34 ...

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Page 77: ...nd connector provided by this RIN PARTS REgUIRED Part Number Descri etion guantity U S Unit List Price 1881 1547 AC Power Cable 1 11 179 1446 9738 Female Connector 1 0 545 1877 7599 Pin 3 0 09 PROCEDURE 1 Ensure that power is removed from the host system 2 Remove the AC cable from theAC Terminal Block B9489 Illustrated Parts Catalog Form 2102158 item C Plate 5 3 Install the AC Power Cable 1881 154...

Page 78: ...Page 2 of 2 4 Install one pin 1877 7599 onto each of the wires on the AC Cable from the host system 5 Install the p ins into the female connector 1446 9738 as shown in Fig 2 Figure 2 BLACK GREEN WHITE 6 Connect the AC power cable connector to the female connector ...

Page 79: ...IMPROVED MAINTAINABILITY IMPROVED RELIABILITY PREREQUISITE None CONDITION Early failure of indioator lamps CAUSE Exoessive voltage applied to lamps CORRECTION Install 220 n resistors in series with lamps in plaoe of 130 n resistors at R85 and R86 PARTS REQUIRED PART NUMBER 1816 6110 DESCRIPrION 220 n W 2 Resistor QTY 2 U S UNIT LIST PRIQE 0 494 Update the sohema tio as shown in figure 1 F E Dist C...

Page 80: ...SH754S2 18794313 A P 8294 18798042 A 9308 1 1 67062 T 9324 1878803 8 A XOWIM A ltD WIM TN AI POs TI OUTJ f CI HO LO T o 147 XO noo 87 0 nee TN AI pes elK I I 5 TP5I5 8 1 I I a I 2 I I o c D18797530 CLIC 7_A7 2 II 13 I G7 B ILL 1400 _ OJ ____ __ ____________________ _____________ _____H O A O 04 9 07 P K I L 7 e 9 07 L _____ _ U p OS S 1_ 03 81 H7 L ____ __ T Ol t 7 9 C1 I I _____ _r___________ ___...

Page 81: ...un MTR wi thout dummy head J CORRECTION 1 Assemble dummy head PAR S REgUlREMENTS Part Number Description Quantitl U S Unit List Price 1268 1847 Resistor 10 ohm iw 3 0 25 1881 4194 Connector 1 4 021 1879 5047 Terminal 4 0 19 PROCEDURE 1 A dummy head is required 2 This should be assembled using the parts listed in Parts Requirements 3 Assemble the resistors and the terminals into the connector as sh...

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Page 83: ...03500 018 which have been returned to G1enrothes for rework under the update program The change can be identified by examining the point where the head is joined to the carriage block If there is an extra fillet of white adhesive present then there is no need to fit this RIN If you have any doubt then please contact your local Technical Support Group THIS RIN IS MANDATORY PREREQUISITE NONE CONDITI...

Page 84: ...tched on 4 The utmost care must be taken not to allow any adhesive to contaminate adjacent areas 5 Do not se excess adhesive as it may run into the pad arm mechanism 6 The majority of time required for this RIN is for removing replacing the minidisk in the BSO If therefore the B80 has 2 minidisk drives the RIN should be installed on both drives at the same time 7 The kit contains sufficient materi...

Page 85: ...til the back of the upper head can be accessed through the chassis 9 Taking the utmost care squeeze the adhesive from the syringe to make a continuous strip where the back of the head meets the carriage block See figures2 thru 5 for details DO NOT USE EXCESS ADHESIVE 10 Use the cleaning wad to remove any spots of adhesive from adjacent areas 11 Turn the unit over and repeat steps 8 thru 10 for the...

Page 86: ...Figure 1 Removing Separator Clip from Sachet R 2141 004 Page 4 of 6 ...

Page 87: ...CA IAGE ASSV AT ITS POSITION FULLV lACK F OM SPINDLE Figure 2 Applying Adhesive to Upper Head Figure 3 Upper Head Adhesive Fillet in Place R 2141 004 Page 5 of 6 ...

Page 88: ...T ITS POSITION NEAR TO SPINDLE Figure 4 Applying Adhesive to Lower Head ADHESIVE FILLET HEAD ON HEAD ARM FREE FAO EI OXV COIL SPRING FREe FROM EPOXY Figure 5 Lower Head Adhesive Fillet in Place R 2141 004 Page 6 of 6 ...

Page 89: ...nits in which boards with Revision K artwork are fitted PREREQUISITE CONDITION CAUSE CORRECTION PART REQUIRED PART NUMBER 2155 6337 1876 5156 1876 9877 None Failure to adjust the index to data burst adjustment to specification Quoted range of index to data burst adjustment 650 us to 1 7 rs insufficient to cover mechanical tolerances Give Revision K oards the same adjustment range 160 us to 1 7 ms ...

Page 90: ...tiometer RV1 at location B 6 with a SOK pot 5 Replace resistor R64 at location AS with a 2K ohm resistor 6 Replace capacitor C33 at location AS with a 0 047uF capacitor 7 Refit revision K board to drive 8 Refit disk drive to host system 9 Switch on Power to Host system 10 Carry out circumferential alignment procedure 11 Amend the schematic drawing to reflect change Refer to Figure 1 ...

Page 91: ...INDEX TO DATA BURST SV ADJUSTMENT 160 uS to 1 7 mS SV XD Sec XD SEC RTN TP 6 4 R160 FIGURE 1 R63 ClIO OV RIN R 2141 005 PAGE 3 of 3 DATE 26 October 1977 OV 21 X AS I OV C33 0 047uF 5V ...

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Page 93: ...RIBIT ALIGNMENT TyrE OF CHANGE o FUNCTIONAL TOP UNIT NUMBERS 1878 9347 1879 4503 1881 2644 PREREQUISITE CONDITION CORRECTION DATE METER DOCUMENTATION 26 October 1977 IMPROVED MAINTAINABILITY o IMPROVED RFLlABILlTY 1881 2651 1881 0192 1881 0184 None No documentation for alignment meter Documentation included in this RIN F E nisI BS o THIS CHANGE IS A RESULT OF FIELD REPORTING Code 1 _ _ _ FOR LIBRA...

Page 94: ... 4194 1879 5047 1881 4202 1880 0466 1447 1718 1323 9397 1105 7932 1256 0397 1257 4125 1256 5206 PARTS LIST COMPLETE ALIGNMENT METER COMPLETE P C B ASSEMBLY DESCRIPTION TRANSFORMER CASE NEON LAMP L E D SWITCH SWITCH D P D T INSULATING TERMINAL GROMMET GROMMET SLEEVED METER STANDOFF FUSE HOLDER FUSE 1A TERMINAL BLOCK FUSE 500mA CONNECTOR HOUSING FIXED TERMINAL WAFER ASSEMBLY POLARI ZIN G PEG LUG CLI...

Page 95: ...0 1879 9650 1880 1191 ELECTRICAL RIN R 2141 006 PAGE 3 of 7 DATE 26 October 1977 DESCRIPTION NUT LOCKWASHER PLAIN WASHER POT 4 7K LOCKING NUT CABLE TIE TRANSFORMER BRACKET COMPONENTS DESCRIPTION DIODE IN 4448 DIODE ZENER IN 751A DIODE IN 93S 9V DIODE TYPE IN 752A BRIDGE RECTIFIER PCB ARTWORK TERMINAL POST HEATS INK SCR PHD 4 40 x 230 9602 IC 7474 D D TYPE IC 7400 Q 2 INP ND IC 7410 T 3 INP ND IC 7...

Page 96: ...6113 RES 120 OHM 1 2W 1876 6154 RES 180 OHM 1 2W 1876 6170 RES 220 OHMS HW 2 1876 6196 RESISTOR 270 1 2W 1876 4969 RES 330 OHMS QW 2 1876 4985 RES 390 OHMS QW 2 1876 5008 RES 470 OHMS QW 2 1876 5024 RES 560 OHMS QW 2 1876 5081 RES 1K QW 2 1876 5172 RES 2K4 QW 2 1876 5255 RES SKI QW 2 1876 5271 RES 6K2 QW 2 1876 5297 RES 7K5 QW 2 1876 5321 RES 10K OW 2 1876 5305 RES 8K2 QW 2 1876 5396 RES 20K OHMS ...

Page 97: ...1876 9950 1876 9976 1876 7624 1881 4038 RIN R 2141 006 PAGE 5 of 7 DATE 26 Oc tober 1977 DESCRIPTION RES 200K OW 5 RES 1MEG OW 5 RES 24K OW 2 POT 20K POT 50K OW POT 200K CAP 2 2PF 50V CER CAP 100PF 500V CAP 200PF CAP 430PF 500V CAP 820PF 300V 5 CAP 01 F 50V CAP 022MF 80V CAP 0 068MF 80V CAP 0 10UF 50V CAP 1 0UF 50V CAPACITOR 2 2U20 C CAP 15 MF CAP 2200UF 25V ELE ...

Page 98: ... rou ID 8867 _ 1_ 4 E 1881 2 ...

Page 99: ...G I I I 1_ OHl Y FITTED FOR CERY DG200 TlPE SEE SoH SoA EI88I MOe TP 2_ POSTS EO THU 3 U MlCRO INCH A61 JK ISAlF C29 2 21JF A54 611 2 ASS 560 12 1 f_ ...

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Page 101: ...m Guadalajara Plant with Sere No 151647476 and below PREREQUISITE CONDITION CORRECTION INSTRUCTIONS None Head leads have a tendency to break in the vicinity of the clamps securing the leads to the carriage assembly and casting This can result in hard or intermittent read write failures Removal of clamps from the carriage assembly and casting to eliminate the reliability hazard 1 Switch off the pow...

Page 102: ...ove clamps PIN 1880 9632 1880 9640 that secure the head leads to the casting in the vicinity of the carriage assembly 5 Refit the side panel of the Disk Drive unit 6 Switch on the power to the Host System 7 Carry out functional check of the System ...

Page 103: ...CLAHP 1881 0846 CARRIAGE ASSEMBLY R21t11 007 PAGE 3 of 3 DATE 28 February 78 CLAr 1PS CASTING 1880 9632 1880 9640 LEAD FIGURE 1 SHOWING THE POSITION OF THE CLAMPS Printed in U S America ...

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Page 105: ...BILITY 1881 2651 1881 0192 1881 0184 I J IMPROVED RELIABILITY Below Sere No 209689 018 PREREQUISITE None CONDITION 1 Heavy score marks around the disk center CORRECTION PARTS REQUIRED PART NUMBER 1882 3377 INSTRUCTIONS hard hole to show possible disk slippage 2 Read errors caused by disk slippage Replace the annulus and stud with a modified version This design modification improves the unit s capa...

Page 106: ... Install the new bearing PIN 1881 8195 to the new annulus PIN 1880 9335 8 Insert the new annulus and put in a position as in Step 4 9 Insert the new stud PIN 1881 9771 into the new bearing and then put the spring over the stud 10 Move the annulus until the side located on the lower side of the cartridge receiver goes through the slot and is located on the top side of the cartridge receiver 11 Clos...

Page 107: ... RECEIVER 2nd RIN R 2141 008 REV PAGE 3 of 3 DATE 1 May 1978 SLOT ANNULUS ASSEMBLY DOOR RELEASE BAR LOCATING SURFACE SPRING BEARING ANNULUS FIGURE 1 CARTRIDGB ECE i H AnD J NUULUS ASSEMBLY Printed in u s America ...

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Page 109: ... 1881 2644 1881 2651 1881 0192 DATE 5 8 77 5 8 77 5 8 77 5 8 77 5 8 77 9 19 77 TITLE Improvement to Read Channel Improved Maintainability Switched Filter Write Enable Delay Possible Clock Head Address modification False Write Enable Indication Missing Artwork on REV K Slave Boards F E Dist I BS Code 1 _ _ o THIS CHANGE IS A RESULT OF FIELD REPORTING 343 A FOR LIBRARY BINDER 2102141 Printed in U S ...

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Page 111: ...ttent read errors CAUSE Incorrect frequency response of read amplifier CORRECTION Make the following changes to the read amplifier PARTS REQUIREMENTS Part Number 1103 0046 1876 5008 1877 2392 PROCEDURE Description 200 uH Choke 470 ohms lw 2 Resistor 620 pF Capacitor Quantity 2 2 1 U S Unit List Price 5 90 0 224 1 658 1 Identify the artwork revision of the PCB The revision letter is shown after the...

Page 112: ...the following components R53 R54 R154 R155 TP16 TP17 C17 C13 Retain C13 51OpF for future use 4 Fit two 470 n resistors PiN 1876 5008 as shown in Figure 2 5 Fit two 200 uH Chokes PiN 1103 0046 as shown in Figure 2 6 Fit the 510pF Capacitor removed in Step 3 in the C17 position FIT 200 uH CHOKE FIT 470 FIT 200 u CHOKE __ Ad C19 FIGURE 2 FIT 510 pF CAPACITOR ...

Page 113: ...r pIN 1811 2392 in the C 13 position 8 Update the sohematios as shown in Figure 3 REVISION G MASTER R48 H2 IK5 RSI J2 It FIGURE 3 CN 9 Remove R53 R54 R51 R58 R154 R155 C13 C16 C11 C18 as shown in rigure 4 Retain C13 510pF ror future use R53 R54 FIGURE 4 ...

Page 114: ...N 1876 5008 in the R53 R54 positions as shown in Figure 6 14 Fit the two test points TP16 TP17 in the right hand holes of the C16 and C18 positions The holes nearest to I C8 These test points will now be called the C16 and C18 pins 15 Fit a 2kAresistor R57 removed in Step 11 between R57 righ t hand hole hole nearest to I C8 and the c16 pin 16 Fit a 2K Il resistor R58 removed in Step 11 between R58...

Page 115: ...ition 20 Fit a 200 uH choke piN 1103 0046 between the C16 left hand hole nearest to I c 7 and the TP16 hole Keep the choke leads as short as possible 21 Fit a 200 uH choke piN 1103 0046 between the C18 left hand hole nearest to I C7 and the TP17 hole FIT R155 470 FIT 200uH CHOKE ABOVE R155 FIT 200uH CHO ABOVE R154 FIT R154 470A FIT C16 0 1uF FIT R57 2K4 F FIT R58 2K n fJ 0 0 0 FIT C18 O 1uF IT C17...

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Page 117: ...d at the end of this LIN PCB artwork must be revision DE or F CONDITION Difficulty in maintainirig the unit due to the large amount of rework on the PCB CORRECTION Install a new PCB PARTS REQUIREMENTS Part Number 1881 3840 or 1881 3857 1881 1448 PROCEDURE Description Master PCB Slave PCB Carriage Assy Quantity 1 1 1 u S Unit List Price 1212 39 832 93 757 46 1 Check that the artwork revision etched...

Page 118: ...00124 018 B200125 018 B200133 018 B200134 018 B200147 018 B200148 018 B200151 018 B200154 018 B200156 018 B200163 018 B200171 018 B200187 018 BMG branches with one of these units should contact T I O Central for further instructions International branches with one of these units should contact I T I O Glenrothes for further instructions T I O CENTRAL Burroughs Corporation World Headquarters DEl RO...

Page 119: ...units will have a coloured label applied to the ID label Consult your local technical support group before applying this LIN PREREQUISITE L2141 001 L2141 002 CONDITION Intermittent read errors at outer tracks CAUSE Incorrect frequency response of the read amplifier CORRECTION Install a switched filter This filter lowers the cut off frequency of the read amplifier at addresses 0 thru 31 PARTS REQUI...

Page 120: ... For revisions Hand J go to Step 2 For revision G go to Step 12 2 Remove the non ground end of R57 from the PCB and connect it to the CIG lead as shown in Fiqure 1 3 Remove the connect it 4 R58 NEW CAPACITORS MOUNTED THRU PADS PREVIOUSLY OCCUPIED BY R57 and R58 FIGURE 1 2200pF CIG or CI8 CAPACITOR JUMPER FIGURE 2 and 1 ...

Page 121: ...tall a 2200 pF capacitor PIN 1877 1287 vertically into the hole vacated by R58 in Step 3 7 Connect the other lead of the 2200pF Capacitor to the lead of C18 8 Install the followinq jumpers ICI Pin 12 to IC20 Pin 12 ICI Pin 10 to IC20 Pin 9 9 Install the following jumpers IC20 pin 10 to IC20 Pin 12 Refer to Figure 3 IC20 pin 9 to IC20 Pin 13 70 6 0 u r 0 2 f lP CAPACITOR 8 IC 1 PIN 10 CA 111 LQ IC ...

Page 122: ...CB end of the capacitor installed in steps 6 11 Modify the schematics as shown in figures 4 and 5 OV lei G 5N7426 18119057 J S 74 74 14473607 U JJ4733C 20100582 Y jJA7IOC 11272077 UTA A TYPE AI 1109 5924 DIODES A TYPE 25 2OO 2911 C IN753 1126 3241 R48 H2 IK 12 1 AI LATCH 64 ASI J2 51 AS Ja I30 IIaW D25 6 2V FIGURE 4 01 2M L5 C K2 I 200JJH 0 Ii J Ie CIS J2 OolJJII 01 ...

Page 123: ...7 AAE SILICON DIODES MATCHED OUADS A21 C2 TP2 I N 4I C2 IK A22C2 A23 C2 ov 12V 12 1 6 C7 FIGURE 5 12 Check that artwork is at Revision G IK5 TPI3 C2 12V 13 Install one 2200 pF capacitor PiN 1877 1287 to each leg of C17 as shown in figure 6 2700pF CAPACITOR FIGURE 6 JUMPER TO IC 20 IK5 ...

Page 124: ... to IC20 Pin 9 15 Install the followinq jumpers IC20 Pin 10 to IC20 Pin 12 IC20 Pin 9 to IC20 Pin 13 16 Install the following jumpers Refer to Fiqure 3 and 6 IC 20 Pin 8 to one capacitor installed in step 14 IC20 Pin 11 to the other capacitor installed in step 14 17 Update schematics as shown in figures 4 and 5 ...

Page 125: ...al support group before applying this LIN PREREQUISITE LIN L2l4l DOt L2l4l D02 and L2l4l 003 CONDITION Incomplete edge erase at end of sector Possibility of heads moving or address select changing before the end of erase CORRECTION Install the changes provided in this LIN PARTS REgUlREMENTS Part Number Descriftion Quantitl U S Unit List Price 1876 4910 Resistor 200 ohms lw 1 0 972 1876 5362 Resist...

Page 126: ... R vision G H or J 2 Replace Cl by a 2 2 F capacitor PIN 1876 7616 Observe the polarity of the capacitor and install as shown in figure 1 Cl VE END FIGURE 1 3 Update the schematic as shown in figure 2 6 81 WRT f N1 4 EAASI DRIVER 1 82 6 R e2 2 3p __ __ K 200 CI 82 2 1 J ov FIGURE 2 03 CI 02 ...

Page 127: ... 1876 5479 7 Replace R76 by a 82 Knresistor PIN 1876 5545 8 Update the schematic as shown in figure 3 POSITIONER CLOCK 6 1 POS CLK EN FIGURE 3 I POSITtONER SPEED RAMP Sl OW CLKS W 6 emS FAST eLK 4 5mS 9 Cut the etching on both sides of the PCB between pins 3 and 4 of IC 33 NOTE check with a suitable meter to ensure that the etching has been cut completely ...

Page 128: ...gure 4 7 o J 0 8 6 0 9 5 0 0 10 REAR OF IC 33 IC 33 4 0 11 0 12 CUT 0 13 1 0 0 14 FIGURE 4 11 Install a jumper wire from IC40 Pin 6 to IC 33 Pin 3 12 Install a jumper wire from IC24 Pin 6 to IC33 Pin 4 13 Update the schematic as shown in figure 5 POIITIOHIR CLOCIe 6 C1 POS ClK EN 6 81 PSKI_ _ _ _ _ _ _ _ ___ I 11 C lK J FIGURE 5 ...

Page 129: ...l a 200n resistor PIN 1876 4910 on the component side of the PCB as shown in Figure 6 ADD 200 n RESISTOR CUT TRACK o FIGURE 6 16 Install a 6 8 F capacitor PIN 1877 0578 on the component side of the PCB at Location A2 as shown in figure 7 NOTE Observe polarity of the Capacitor 17 Update the schematics as shown in figure 8 ...

Page 130: ...HI AO INSTALL 6 8 l1F CAPACITOR IC 1 IC2 IC3 FIGURE 7 L 2141 004 Page 6 of 6 ____ __JM r __ I2Y 10K RI AI 270 R2 R8 81 10K R3 AI 270 FIGURE 8 AI teAD SELECT 1KL _ _ _ OY R4 AI IK OY D3 I N ...

Page 131: ...vision G H or J CONDITION Write Enable indicator lights when door is open and there is no media present CAUSE WIH transducer alignment may cause insufficient light to fallon the sensor when the door is opened CORRECTION Gate WIH with FILE OPe The Write Enable indicator will no t light until the FILE OP indicator is lit To maintain compat bility with units with artwork revision K and greater and to...

Page 132: ... 87 4_A7 LATCH 4 A7 LATCH 32 TP _ g 9 J 9 R3S fl E OP IND A6 8 1 9 OCJ 0 04 C 6 T p 111 L GB J8 1 05 9 n C3 6 2 f5 6 130 f w P S CLk EN 7 _ 1 t n MP 2 S 3 13 05 L A f25 D _ jl 1 2 2 C3 3 03 r v OLE 1 12 12 3 G7 a 3 13 12 4 H3 rI 05 E r 24 I C3 M WRT EN 114 10 2 A 13 6 3 C3 G7 IL r s 6 6 I 51r24 6 A l t 5 A 5 12 6 3 12 TP__ ICs l e3 M UN T SELT 4 4 pWDS 84 5 6 I s 8 A S 7400 1 73516 1 2 1 A f 1fsC6...

Page 133: ...TED All slave units with P C B artwork revision K PREREQUISITE P C B artwork must be revision K CONDITION Errors during recalibration CAUSE Missing capacitor ground ClOO location CS CORRECTION Add the necessary grounding link TOOLS REQUIRED Soldering iron Wire cutters PARTS REQUIRED 2 1977 Part Number Description U S List Price 1269 9377 26 A W G Wire 2 ins 0 02 Q18 C34 ADD GROUND LINK FIGURE 1 CO...

Page 134: ...ave unit from the B 80 L2141 006 Page 2 of 2 2 On component side location C5 add a jumper wire between the end of C100 nearest IC 23 and the ground at C34 Refer Figure 1 3 Replace drive in the B 80 and run an operational check ...

Page 135: ...879 4503 1881 0184 PREREQUISITE CONDITION CORRECTION 1881 2644 1881 2651 1881 0192 None The present value of Read Enable Delay 43 us is insufficient to allow the Phase Locked Loop to lock on The Read Enable Delay is increased from its nominal value of 43 us to 150 us PARTS REQUIREMENTS PART NU 1BER DESCRITPION QTY 1 U S UNIT LIST PRICE 1876 5487 Resistor 47K W 0 251 INSTRUCTIONS 1 Switch off the p...

Page 136: ...5 Refit the master board to the drive unit 6 Refit the disk drive unit to the Host System 7 Switch on the power to the Host System 8 Carry out an operational check of the System 9 Amend the schematics to reflect the change 5V I R 93 47K 1 C 71 If 14 o OlllF 10 57 N Q2 12 9 FIGURE 1 READ ENABLE DELAY 15 O llS ...

Page 137: ...ive units are subsequently fitted to a BSO system TOP UNIT NUMBERS 1878 9347 1879 4503 1881 0184 PREREQUISITE CONDITION CORRECTION PARTS REQUlREMENTS PART NUMBER 1876 5321 INSTRUCTIONS 1881 2644 1881 2651 1881 0192 None The present value for the Index Sector pulse duration is too long The Index Sector pulse duration is decreased from its nominal value of 1 8 s to 1 s DESCRIPTION RESISTOR 10K W 1 U...

Page 138: ...t 4 Replace resistor R62 at location A4 with a 10K ohm resistor 5 Refit the P C B to the drive unit 6 Refit the disk drive unit to the Host System 7 Switch on the power to the Host System 8 Carry out an operational check of the System 9 Amend the schematics to reflect the change C29 270Pf 15 10 11 N A3 14 13 SV R62 10K 10 FIGURE 1 INDEX SECTOR 1 ys PULSE GENERATOR ...

Page 139: ...TS REQUIRED PART NUMBER 1876 4969 1876 5206 1877 1030 PROCEDURE Revision K circuit board level 10 and below Errors in read after write The erase current decay is generating noise on read data Modify the circuit to reduce the write enable delay and to limit the rate of decay of the erase current DESCRIPTION Resistor 330 ohms 2 Resistor 3 3K 2 Capacitor 0 47 F 10 35V 1 1 1 UNIT LISTPRICE 0 34 0 34 1...

Page 140: ...76 5206 at Location 6 Install the resistor R165 P N 1876 4969 at Location in place of 01 7 Install the capacitor el17 PIN 1877 1030 from TP l to OV Ground B Replace the circuit board in the Master and or the Slave Unit C Perform an operational check of the system O Update page 4 and or Page 2 of the Master and or Slave Logic schematic as shown on Page 3 A6 B L ...

Page 141: ... C 2 I Ty t 2S 2 iC C 7S s lI2 2 CIS o i I I at 1 t J TPI3 1 1 C2 1 2________ __ ________________________________________________________________________________ l A 7C H 2f 5 7 ______________________ ________________ _________________________________________ LATCH6 1 r I t NOTE OTE TPI8 ON REV L PCB ONLY INDICATES GRID REFERENCE ON CIRCUIT BOARD b ri l 2 1 I 7 1 BurJ ou nsQ 1 WRITE DRIVER B9489 1...

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Page 143: ...o 15165236 Guadalajara Units Revision K circuit board level 10 and below Difficult to adjust the Phase Locked Loop and Data Window Unselected phase locked loop integrated circuit Modify the circuit to allow the replacement of the phase locked loop integrated circuit DESCRIPTION QTY UNIT LIST PRICE Resistor 2K 2 W 1 0 34 Resistor 24K 2 W 1 0 34 Capacitor 39pF 5 500V 1 0 68 Capacitor 390pF 5 500V 1 ...

Page 144: ...e capacitor C76 PIN 1877 2335 at Location P5 7 Install the resistor R99 PIN 1876 5412 at Location Q3 8 Install the capacitor C68 PIN 1877 2392 at Location 9 Install the capacitor C69 PIN 1877 2087 at Location between pins 1 and 2 of I C 55 C Replace the circuit board in the Master Unit D Perform the Phase Locked Loop P L L and Data Window adjustments as per A T I 130405 REV P2 P2 E Update page 2 o...

Page 145: ...9 1109 5924 A TYPE 25 2005 2981 0 757A lOBO 6206 OO E INDICATES GRID REFERENCE ON CIRCUIT BOARD l t5V V Ar IK 12V RII6 RS 6B 1 2W TPII S P i I r 9 OT E TPI9 ON REV L PC B ONLY 8 7 DELAY SV OV CBS RS O IJJF Rill P4 IK O IJJF C72 P4 II 12 O IJJF OV SV v RV3 P3 SV X v SOK 200 600 hS 10 5K TPII 7 P3 31 RI02 04 2K CI02 03 O IJJF TPII 2 P3 R9f N2 100 5 1 Sv TPlII4 P3 RO CLK 1 A7 rr _ c___ _ ISCH MA 5TER...

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