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Control Data Corporation BR8 SERIES, Hardware Maintenance Manual

The Control Data Corporation BR8 SERIES Hardware Maintenance Manual is a comprehensive guide for maintaining and troubleshooting this advanced product. Available for free download from manualshive.com, this manual provides detailed instructions to ensure optimal performance and longevity of your BR8 SERIES equipment.

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Summary of Contents for BR8 SERIES

Page 1: ...E DISK DRIVE GENERAL DESCRIPTION OPERATION INSTALLATION AND CHECKOUT THEORY OF OPERATION DIAGRAMS MAINTENANCE MAINTENANCE AIDS PARTS DATA WIRE LISTS MAGNETIC PE PHER LS INC I ll a subsidiary of J r J CONTRPl DATA CORfORATION HARDWARE MAINTENANCE MANUAL 77834769 ...

Page 2: ...ANUAL SECTION REVISION STATUS CHANGE 4 5 6 7 E U W A E Y Y A 8 9 10 11 12 AUTHORITY K A PI 21165 K A PL 21174 Address comments concerning this manual to Technical Publications Magnetic Peripherals Inc 4000 Northwest 39th Expressway Oklahoma City Oklahoma 73112 or use the enclosed user comment sheet Printed in the United States of America All Rights Reserved 77834769 Y ...

Page 3: ...h seven and section nine This number should be used when making reference to the Flexible Disk Drive Hardware Reference Maintenance Manual Section VIII Parts Data is identified by the unique pUblication number 77834771 This manual applies to several models of the FDD A configurator sheet is provided on the following page which describes each FDD configuration that this manual will support Refer to...

Page 4: ...037 BR8A2J X 505 038 BR8A2K X 509 039 BR8A2L X 507 iv 603 X 603 X 603 X 603 X 603 X 603 X 603 X 603 X 602 X 602 X 602 X 602 X 603 603 603 X 603 X 603 X 603 X 603 X 603 X 603 X 603 603 X 603 X 603 X 603 603 X 603 X 603 X 603 X 603 X 603 X 603 X TMA NO X 75744041 X 042 X 043 X 044 X 045 X 046 X 047 X 048 049 050 051 052 X 053 X 054 X 055 X 056 X X 057 X X 058 X 059 X 060 X 061 X 062 X 063 X 064 X 06...

Page 5: ...rror 2 3 3 Read Error DISKETTE HANDLING RECOMMENDATIONS 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 2 2 2 III INSTALLATION AND CHECKOUT 3 1 3 2 3 3 3 4 3 5 3 6 INTRODUCTION UNPACKING INSTALLATION CABLING AND CONNECTIONS 3 4 1 Input Output Cable 3 4 2 DC Power Connection 3 4 3 AC Power Connection ENVIRONMENT INITIAL CHECKOUT 3 6 1 Operating Frequency 3 1 3 1 3 1 3 1 3 1 3 2 3 2 3 2 3 2 3 3 JV THEORY OF OPERATION...

Page 6: ...ad Errors 6 5 10 Write Errors 6 5 11 Write Protect Inoperative ADJUSTMENT PROCEDURES 6 6 1 Carriage Stop Adjustment 6 6 2 Burst to Index Check and Adjustment 6 6 3 Actuator Alignment Diskette 6 6 4 Push Rod Travel Adjustment 6 6 5 Door Interlock Switch Adjustment 6 6 6 Disk Load Bail Adjustment 6 6 7 Spindle and Cone Adjustment 6 6 8 Write Protect Assembly Adjustment 6 6 9 Track 00 Switch Adjustme...

Page 7: ...NTRODUCTION ILLUSTRATIONS PARTS LISTS TOP MECHANICAL AND ASSEMBLY LOCATOR 8 4 1 Top Mechanical Assembly TMA REPLACEMENT PARTS PARTS LIST INSTRUCTIONS 8 6 1 lllustration Parts Lists 8 6 2 Top Down Assembly Component Parts List 8 6 3 Cross Reference Index 8 6 4 Sheet Number Referencing IX WillE LISTS 8 1 8 1 8 1 8 1 8 1 8 1 8 10 8 10 8 10 8 10 8 10 9 1 INTRODUCTION 9 1 9 2 UPPER HARNESS ASSEMBLIES 9...

Page 8: ... Stop Adjustment 6 19 1 6 6a Plastic Carriage Stop and Stop Gauge Assemblies 6 19 1 6 6b Metal Carriage Stop Assembly 6 19 1 6 7 Write Splice Bit to Index Timing 6 20 C 6 8 Head Alignment Amplitude 6 22 6 9 Chassis Base Assembly 6 23 6 10 Disk Load Solenoid 6 24 6 11 Spindle and Cone 6 25 6 12 Base Casting Assembly 6 28 6 13 Head Load Pad Replacement Illustration 6 30 6 14 Solenoid Adjustment 6 31...

Page 9: ...t panel has a spring loaded door through which the diskette is installed The door is mechanically linked to the disk loading mechanism and the head load interlock switch therefore when the door is closed the Read Write head may be loaded on the diskette in preparation for the transfer of data Standard Models Versus Daisy Chain Models Throughout this manual certain features and operation of the Fle...

Page 10: ...pping A C Power Source Refer to the FDD configurator or FDD nameplate to determine A C Power requirements 1 3 3 PERFORMANC E CHARACTERISTICS The equipment specifications for the FDD are as follows 1 2 ACCESSING TIME Maximum Access Time Maximum One Track Access Time Average Access Time RECORDING 770 ms 20 ms 263 ms Mode Density nominal Double Freq MFM 1836 B PI 72 3 BPmm 3672 BPI 144 6 BPmm Outer T...

Page 11: ...EAD Head Unit Track Width Track Spacing Erase to Read Write Gap 77834769 D CDC 421 60W Single Density or Equiv CDC 423 60W Double Density or Equiv 8 x 8 inches 203 2 x 203 2mm including jacket 1 7 88 inches 200 1mm Track 76 inner 2 0290 inches 515mm nominal Track 00 outer 3 6123 inches 918mm nominal Magnetic Oxide 360 rpm 1 0 013 in 0 02083 in 0 035 in 0 33 mm 0 529 mm 0 889 mm 1 3 1 4 ...

Page 12: ......

Page 13: ...erly seated spindle has engaged diskette and door is closed and latched h Protect the empty envelope from liquids dust and metallic materials 2 2 2 FlEXI BlE DISKETTE REMOVAL a Open FDD door to stop diskette rotation and disenagage spindle b Remove diskette from FDD and put it in its storage envelope c Close FDD door 2 3 ERROR RECOVERY The following paragraphs give information needed to recover fr...

Page 14: ...ta reliability and extend the diskette life 2 4 DISKETTE HANDLING RECOMMENDATIONS Since the recorded diskette contains vital information reasonable care should be exercised in its handling Longer diskette life and trouble free operation will result if the following recommendations are followed a Do not use a writing device which deposits flakes e g lead or grease pencils when writing on diskette j...

Page 15: ...ds dust and metallic substances at all times h Do not exceed the following storage environmental conditions Temperature 50 to 125 F 10 to 56 1 C Relative Humidity 8 to 80 Maximum Wet Bulb 85 F 29 4 C i Diskettes should be stored in a box or cabinet when not in use o 77834769 A 2 3 2 4 ...

Page 16: ......

Page 17: ...3 4 1 INPUT OUTPUT CABLE The maximum cable length from connector to connector is 25 feet All inputs and outputs require pairs one line for function one for ground The characteristic impedance is typically 120 ohms The information relative to the I O connector Jl and pin signal assignments are defined in Table 5 1 Figure 5 2 and Figure 5 3 On models designed for daisy chain operation the terminatin...

Page 18: ...g 30 to 150 F 35 to 65 C 5 to 95 relative humidity providing there is no condensation Max Wet Bulb 80 F 27 C 3 6 INITIAL CHECKOUT This procedure should be used to determine that FDD is operational The procedure assumes that the unit is installed and the I O and power cables are connected a Apply ac power to unit and visually check that the spindle rotates b Apply dc power to unit c For Daisy Chain...

Page 19: ...quency Conversion for applicable models PLUG AMP PN 1 480700 0 MPI PN 83435302 1 CONTACTS SOCKET I _ _ _ J __ I CABLE CONNECTOR MATING PLUG RECEPTICLE AMP PN 1 480701 0 MPI PN 83435402 8 AMP PN 350536 1 STRIP AMP PN 350550 1 LOOSE MPI PN 83435507 5 CONTACTS PIN AMP PN 350547 1 LOOSE AMP PN 350218 1 STRIP MPI PN 83435501 8 STRIP r 12 AC CABLE 75292202 RECEPTICLE ON FDD ASSEMBLY Figure 3 1 AC Cable ...

Page 20: ...r ...

Page 21: ...hown in Figure 4 1 and explained in Table 4 2 All signals received by the FpD except the door unlock signal are gated with Unit Select so that no stepping reading or writing can be performed on an unselected FDD Also all signals generated within the FDD except the Ready signal are gated with Unit Select so that no signals can be transmitted from an unselected FDD During the write operation the sel...

Page 22: ...NLOCK SOLENOID WRI TE PROTECT ACTIVITY LED UNIT SELECT TO WRITE PROTECT SENSOR t 6 T WRITE PROTECT lEJ UNIT 1 2 3 OR 4 DIRECTION OR HEAD LOAD SOLENOID STEP IN STEP OR TRACK 00 SWITCH OR SENSOR STEP OUT CONTROL LOAD HEAD LOGIC READY FROM DOOR CLOSED SWITCH UNIT 1 2 3 OR 4 INDEX A TRACK 00 C JB STEPPING MOTOR SECTOR C 10 II ND X SECTOR SENSOR ND t OR IN DEX SECTOR lEDj DAISY CHAIN MODELS ONLY Figure...

Page 23: ...or functional areas a Control Logic b Write and Fault Logic c Read Logic d Disk Drive e Read Write Head 4 3 1 CONTROL LOGIC The functions of the control logic are to generate the signals that a establish the ready status of the FDD b step the Read Write head in or out upon selection and command of the controller c load the head on the disk for read write operations d protect the disk from writing ...

Page 24: ...ctivated step per phase information from the outputs of U25 s flip flops The leading edge of a step command triggers the three microsecond one shot U16 whose trailing edge clocks the flip flops The phase sequence through which the stepper motor is driven see Table 4 1 is controlled by the steering logic gates U27 pin 8 U27 pin 11 U28 pin 3 and U28 pin 6 These gates receive direction information fr...

Page 25: ...to provide the Track 00 signal that is transmitted to the controller from U15 pin 6 Capability exists for an optical light source LED and sensor photo transistor to be used instead of a switch The sensor output is fed into U30 pin 10 a comparator with hysteresis f The beginning of each disk track is indicated by an Index pulse The disk rotates between a light source LED and a sensor photo transist...

Page 26: ...n the differentiated read signal The out of phase comparators Ul pins 7 and 12 have rise and fall times whose differences are exaggerated by slow down capacitor C2 This results in a narrow negative pulse at U8 pin 11 which triggers a one microsecond retriggerable one shot U26 pin 9 Flip flop U9 pins 8 and 9 perform a noise rejection function in that noise near the zero crossings of the amplified d...

Page 27: ...ear The tunnel erase gap DC erases the intertrack area to improve off track signal to noise ratio and permit diskette interchange between units 4 4 CONTROL AND DATA LINE CHARACTERISTrCS All signal lines must be terminated at the receiver with a characteristic impedance of 120 ohms typically Transmission is by 26 AWG min 120 ohm flat cable or twisted pair one twist per inch with a maximum line leng...

Page 28: ...ve one track outward from the center of the diskette A 10 microsecond minimum logic 1 level pulse on this line causes the head to move one track inward toward the center of the diskette A 10 microsecond minimum logic 1 level pulse on this line causes the head to move me track outward from the center of the diskette A logic 1 level on this line loads the diskette against the head through the use of...

Page 29: ...he transition of each pulse from logic 1 to logic 0 if W2 is present or from logic 0 to logic 1 if W3 is present on the PWA This line reduces write current for tracks 43 or greater A low level reduces write current On this line a logic 1 level with W21 and W22 present or a logic 0 level with W20 and W23 present enables the FDD interface except for Door Unlock and Ready A logic 1 level onthis line ...

Page 30: ... fault com itions Write enable without head load Write enable without write data Incorrect write data rate A write fault can be cleared by a logic 1 on the write fault reset line A logic 1 level indicates that the head is positioned over Track 00 Logic 1 level indicates that hole on diskette is uncovered This line contains the separated data information A logic 1 level pulse of 250 nsec correspond...

Page 31: ...printed circuit board schematics and Figure 5 3 contains the assembly drawing and parts list Table 5 1 PWA Configurator ACTIVITY INDICATOR 0 WRITE FAULT P T DOOR UNLOCK I 0 READY N UNIT SELECT C SECTOR SEPARATION H POWER REDUCTION A DATA CLOCK SEPARATION R T WRITE PROTECT HOUR METER See Figure 5 3 INTERFACE CONNECTOR TYPE CONFIG CIRCUIT BQ RD REF NO IDENT NO 501 75890300 A X 502 75890350 C X 503 7...

Page 32: ...5 2 77834769 D ...

Page 33: ...ON STEP IN rr5 DIRECTION U25 PIN 9 U25 PIN 8 U25 PIN 5 U25 PIN 6 I r J ILE I STEP IN DIRECTION STEP IN __Jr T L _ I L _ _ ON OFF J4 3 OA J4 2 OB I J4 1 OC J4 4MOT C T 5VDC U29 PIN 10 POWER UP ON OFF ON OFF l 15 ms TYP I INDEX SECTOR tl SOFT SECTOR 77834769 N J3 1 I I u U INDEX TP14 1 5 ms 167 ms I HARD SECTOR J3 1 2 6 ms TYP 5 2 ms TYP IN DEX J c 1 1 5ms I SECTOR TP13 TP14 1 1 ONLY ONE PAIR PER FD...

Page 34: ...IS 2S 1511 st 1 1 10 1 s 1 3 61204 12 0 4 1 04 122OJl133 0A1 330f ll 330n 77S24750 3 18 2 Isunl 1 10 1 8 661 31 12oqI20412 004IZ20Jl133Qn 1330f f1330 77 30400 8 J8 251 s lnl 1 0 I 8 661 3 61 2 041204 J 2 0412201l133OJl1 330Pt 13 30P f I W w J 13 X X X X X X X X X X X x x J IX X x x 32 1 1 001 001 001 Its J I PI N CONFIGURATION AND ASSEMBLY USAGE fUNe TlON NANE WRI TE fAULT RE ET WRITE OATA WRI TE ...

Page 35: ... 56 2 CRS RZS R23 RZ2 RZI 5 11 Z4 9 56 2 CRJ CR4 5V 4 8 UNIT SELECT LOW CURRENT WRITE EN 3 WRITE INHIBIT 3 aa E SE INH S T 1 Zlg 5Vr eR9 o TPI sv RZ8 511 n VREF 51 1 R8 5 11 R l3 S I 5V RSS 1 00 5v R58 10 0 c PULL UP X 3 4 5 READ OAT COIIP051TE 1 0 _ V v Z 3 WRITE DATA F 5 WRITE ENABLE o J CRT ERASE HEADI ERASE G S 8 ...

Page 36: ...M 5 I 0 1 HOUR L TJ R4S 5 11 I I I I I I I I I I I 24V RET POWER REDUCTION OPTION I L ______________________________________________ r 5V R59 T S R60 5 11 i R I I J6 02 I DETECTOR 1 WRITE INHIEIT Y 2 J I J6 01 EMI T ND J6 04 I DEl IIID 4 A UNIT S LEC T I V REF L ___________ I L ________________________ 8JIs_ Q E J_____J f 2m i READ DATA I I I I DATA CLOCK SEPARATION l 5E i I 8 ...

Page 37: ...RLOCK I r SI s 1 5V I 24 o 1 t 15 23 I RMI A 14 22 I I UNIT SELECT 4 I UNIT SELECT 3 I c68 1 01 tSv R92 24 9 19 18 17 1Eill c J L J c r REA DY I n REAQY 2 I READY 3l READY 41 UNIT SELECT 2 l ___________________________________________________ t C __________________ _ UNIT SEL ECT I L UNIT SELECT A 2 35 I 1 RMI S I UNIT SELECT 0 2 3 5 I W2 UI3 I I _ I UNIT SELECT I 1 5V I Z4V DOOR UNLOCK RMI A CRIO...

Page 38: ... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ cO e CD n I tv Ul o r CD 3 c o en Ul r CD CD n o M Z 0 WRITE ENA6LE z Qill Z F WRITE DATA Hx PULL UP I 3 C 4 UNIT SELECT 3 TRACK 00 DEHCTOR SWITCH It DEl GND SWITCH N c J3 0S MIT GND SWITCH C l I c Sv W3 o U29 rl s rrv I I I I R83 J3 06 EMITTER I sv I G81t I 5 vREF I I TRACK 00 OPTICS I 5V f rC6 J 0 01 Sv R49 S I i WRIH FAULT WRITE...

Page 39: ...4V C39 L4 7 20 6V 2 VF R26 IW 101 S o HV RET C38 10 C L 4 7 20 35V o V REF 5VF R88 5111 R3 112W 10 5 C47 THRUC51 C53 t 54 5 C57 C59 CfoO I 62 C63 C65 THAU C 7 C70 C7Z DI 5 l C24 C26 1 6 8 01 20 70 35V C28 C40 L4 7 L C29 10 Tzo T IO 35V 200 0 6V 10 1 7 200 0 6V C9 10 TPI5 C30 FJlAM GND 12V HEAD CENTER TAP J2 04 l 8 ...

Page 40: ...950 MATING CONN HOUSING NilP 1 583717 1 CONTACT NilP 1 583649 4 r l D I I I I I I I IA I I I I I L_ i i c 2550 MATING CONN NilP 1 583717 1 CDC 83453423 2 KEYWAY BETWEEN PINS 15 16 SOLDER SIDE KEYWAY AT PIN 1 SOLDER SIDE PIN 8 1 2 COMPONENT SIDE tt LOCA QON COMPONENT SIDE PINS 40 41 COMPONENT SIDE It rCOMPONENT SIDE SOLDER SIDE A SOLDER SIDE A MATING CONNECTOR eRECOMMENDED CONNECTOR NilP pIN 1 8727...

Page 41: ... C35 88 CR6 29 C36 86 CR7 29 C37 93 CR8 29 C38 76 CR9 29 C39 92 CRIO 30 C40 76 CRll 31 C41 102 CR12 31 C42 CR13 31 C43 91 CR14 31 C44 97 CR15 31 C45 90 CR16 C46 76 CR17 29 C47 89 CR18 30 CR19 31 R96 119 CR20 114 PL PL PL IC ITEM JMPR ITEM CONN ITEM U1 17 W1 106 J1 22 U2 16 W2 106 J2 23 U3 16 W3 J3 116 U4 19 W4 106 J4 25 U5 4 W5 106 J5 24 U6 5 W6 106 J6 25 U7 6 U8 13 W7 106 W8 106 J7 100 101 U9 11 ...

Page 42: ... 3 Single 1 current 19 15161100 1 78M12 Voltage Regulator 20 95894500 8 Res Pac 220 330 21 94260301 0 Socket 16 Pi n 2 21 51848401 1 Socket 16 Pin 5 22 94359504 1 Header Flat Cable 3 22 75773900 8 Header Right Angle 4 23 75772401 8 Connector Hdr 24 75743719 9 Header Right Angle 25 75743717 3 Header Right Angle 26 77836043 8 Transistor T1P120 27 77836044 6 Transistor T1P125 28 77835186 6 Transistor...

Page 43: ... 74 83452805 1 78L12 AWC Volt Reg 75 92496227 7 Cap 100V 20 01UF 76 94361400 8 Cap 50V 80 20 0 10UF 77 94227247 7 Cap 100V 2 750 78 94360216 9 Res 1 4W 1 147 79 94227238 6 Cap 100V 2 330 80 77830567 2 Cap 25V 80 20 1 0UF 81 75890977 4 Cap lOOV 0 10 UF 82 75808537 7 Cap 100V 10 0 01 UF 83 94227218 8 Cap 500V 1 PF 47 84 75808509 6 Cap 100V 10 47 85 24504346 8 Cap 10V 20 4 7UF 86 75808514 6 Cap 100V ...

Page 44: ...909 120 94360256 5 Res 1 4W 1 383 121 88885600 2 IC 7437 122 75738655 2 Resistor Module 123 94227250 1 Cap 100V 2 1000 124 38879326 7 Cap 50V 20 0 68 UF 125 94360276 3 Res 1 4W 1 619 NOTES 1 Not Used on 75890400 77614500 2 Used on 75890600 75890750 Only Remarks Intch 3 Not Used on 75890300 75890350 75890550 75892150 77614500 4 Used on 75890550 77614500 Only 5 Used on 75890450 75890500 75890650 758...

Page 45: ...oscope Tektronix 335 or equivalent Feeler Gauges wire Sizes 0 030 0 762mm 0 058 1 47mm 0 060 1 52mm O 062 1 58mm 0 079 2 01mm Feeler Gauge Shim 0 072 1 83mm 0 010 0 254mm 6 3 PREVENTIVE MAINTENANCE The head load pad should be inspected after 650 hours of head load time If pad is worn dirty torn or loose it should be replaced See paragraph 6 7 4 6 4 HEAD CLEANING On occasions the Read Write head ma...

Page 46: ...shooting is started check all DC supply voltages Table 6 1 Flowchart Reference Flowchart Paragraph No Symptoms 6 5 2 Diskette Not Rotating 6 5 3 Read Signal Missing 6 5 4 Drive Not Responding to Commands 6 5 5 Index Pulse Missing 6 5 6 Head Not Loading 6 5 7 Read Write Head Stepping 6 5 8 No Track 00 Indication 6 5 9 Read Errors 6 5 10 Write Errors 6 5 11 Write Protect Inoperative 6 5 1 DC VOLTAGE...

Page 47: ...tor One Shot Index Sector c Signals should conform to Figure 5 1 and Figures 6 1 through 6 4 SCOPE SETTING 2v div 2v div 20v div 20ms div I I I H I t DOOR INTLK J5 4 HEAD LOAD HEAD LOAD SOLENOID J5 5 Figure 6 1 Head Load and Door Interlock Switch A Write Fault should occur when the FDD is Write Enabled and no Write Data is sent 77834769 A 6 3 ...

Page 48: ... Track SCOPE I 1 I _ t l SETTING j 200mv cm l 10us cm I TP3 AND TP4 1 i1 1 1 U _ f y I ALL ZEROS ALL ONES ALL ZEROS r Figure 6 3 Differential Read Signal for Portion of Outer Track SCOPE SETTI NG t 2v div WRITE DATA U U U 2v div I t WRITE F F TP5 I 10v div r h I HEAD WRITE VOLTAGE I V J2 o1 0 5 us div 1 Figure 6 4 Write Data Write F F Output and Head Write Voltage for Outer Track 77834769 G ...

Page 49: ...REALIGN BELT ONTO PULLEY CHECK AC POWER SOURCE CHECK SPINDLE AND CONE ASM FOR PROPER ALIGNMENT REPLACE BELT PERFORM PUSH ROD TRAVEL ADJUSTMENT Par 6 6 4 CHECK DISKETTE CLAMPING AREA FOR EXCESSIVE WEAR CHECK GAP BETWEEN BAI L AND CASTING AND ADJUST BAIL FOR A GAP OF YES 072 WHEN SOL ENOID IS ACTUATED Par 6 6 6 PERFORM SPINDLE AND CONE ADJUSTMENT Par 6 6 7 REPLACE DISKETTE 6 5 ...

Page 50: ...n Units SB088b ____1 6 6 CHECK SWITCH SETTING CHECK FOR INDEX PULSES TP 14 See Figure 5 1 CHECK SIGNAL LEVEL U14 PIN 11 REPLACE PC BOARD SELECT APPROPRIATE SWITCH POSITION PERFORM INDEX PULSE MISSING Par 6 5 5 REPLACE PC BOARD C 77834769 U ...

Page 51: ..._ 6 5 4 DRIVE NOT RESPONDING TO COMMANDS Daisy Chain Units NO l 2 2 77834769 U INSTALL TERMINATOR RM l CHECK BOARD FOR RM l CHECK SWITCH SETTINGS CHECK I O CABLE OR CONTROLLER SELECT APPROPRIATE SWITCH POSITION YES 6 7 ...

Page 52: ... 2 REPLACE PHOTO TRANSISTOR REPLACE LED NO NO CHECK TO SEE IF DISKETTE PROPERLY INSTALLED CHECK DISKETTE ROTATION CHECK TPI4 FOR PULSE SHOWN IN FIG 5 1 YES TURN DISKETTE OVER REINSERT CHECK AT UI5 PIN 8 INDEX FOR PULSE SHOWN IN FIG 5 1 YES REPLACE PC BOARD l 77834769 A ...

Page 53: ...DJUST DISK LOAD BAIL Par 6 6 6 REPLACE HEAD LOAD SOLENOID Par 6 7 5 CHECK SIGNAL LEVEL AT U22 PIN 2 HEAD LOAD CHECK SIGNAL LEVEL AT J5 4 CHECK SIGNAL LEVEL AT J5 2 REPLACE PC Bo RD CHECK I O CABLE OR CONTROLLER ADJUST DOOR INTERLOCK SWITCH SET SCREW TO INSURE SWITCH CLOSURE Par 6 6 5 YES REPLACE INTERLOCK SWITCH 6 9 ...

Page 54: ...TEP OUT PULSE FIG 5 1 CHECK U13 PIN 13 FOR TRACK 00 LEVEL NO UNITlliQYbQ NOT STEP OUT AT TRACK 00 DRIVE OK CHECK U22 NO PIN 5 FOR STEP IN PULSE FIG 5 1 CHECK W6 ON PWA YES CHECK FOR YES PULSES AT M TP7 FIG 5 1 REPLACE PC BOARD CHECK U22 PIN 8 FOR STEP PULSE FIG 5 1 NO NO CHECK I O CABLE OR CONTROLLER NO YES B YES 77834769 A c ...

Page 55: ...R MOTOR NO CHECK STEP IN PULSE SEQUENCE STARTING AT J4 3 J4 2 AN D J4 1 OR STEP OUT PULSE SEQUENCE STARTING AT J4 3 J4 2 AN D J4 1 Shown in Figure 5 1 CHECK RESISTANCE ACROSS EACH STEPPING MOTOR WINDING NO CHECK RESISTANCE ACROSS EACH STEPPER MOTOR WINDING REPLACE PC BOARD YES REPLACE STEPPER MOTOR 6 11 ...

Page 56: ...ION 6 12 REPLACE SWITCH YES CHECK FORTRACK 00 INDICATION 0 8V AT MICRO SWITCH N O TERM RED WIRE CHECK FOR CLOSURE OF TRACK 00 SW USING VOLT OHMMETER PERFORM TRACK 00 SWITCH ADJUSTMENT Par 6 6 9 YES REPLACE PC BOARD c 77S34769 U ...

Page 57: ... 6 7 4 REPLACE WITH KNOWN GOOD DISKETTE NO CHECK READ NRITE HEAD FOR CORROSION OR DIRT CHECK FOR PROPER DISKETTE LOADING CHECK CONDITION OF DISKETTE CHECK WAVEFORMS AT TP3 4 TPI 2 FIG 5 1 VERIF WAVEFORM AN PLlTUDE SHAPE AS SHOWN IN FIG 6 2 AND 6 3 YES CLEAN HEAD ACCORDING TO PARA 6 4 PERFORM SPINDLE AND CONE ADJ PARA 6 6 7 6 13 ...

Page 58: ...6 5 6 REALIGN ACTUATOR Par 6 6 3 CHECK VISUALLY IF HEAD IS LOADED CHECK ACTUATOR ALIGNMENT Par 6 6 3 CHECK BURST TO INDEX Par 6 6 2 CHECK COMPOSITE DATA TPS Figure 5 1 CHECK I O CABLE OR CONTROLLER YES REPLACE READ WRITE HEAD t ACTUATOR ASSY 77834769 U ...

Page 59: ...SE j NO OSC ILLOSCOPE CURRENT PROBE CHECK WRITE TO CHECK CURRENT VO LTAGE OR WAVEFORM CURRENT WAVEFORM AT J2 1 CHECK VISUALLY IF HEAD IS LOADED YES GO TO HEAD NOT LOADING J2 2 Figures 5 1 6 4 CHECK CONTINUITY OF HEAD WINDINGS Par 6 5 6 YES YES 77834769 U NO RESET WRITE FAULT CHECK WRITE ENABLE PULSE AT U21 PIN 6 Figure 5 1 CHECK FOR WRITE DATA PULSE AT U21 PIN12 Figure 5 1 YES A 6 15 ...

Page 60: ... contd c 6 16 B CHECK I o CABLE OR CONTRO LER YES A NO CHECK VISUALLY IF HEAD IS LOADED GO TO HEAD NOT LOADING BEFORE PROCEEDING Par 6 5 6 REPLACE PC BOARD REPLACE READ WRITE HEAD ACTUATOR ASSEMBLY 77834769 U ...

Page 61: ...ERATIVE 77834769 U REPLACE PC BOARD NO _ B NO CHECK TO BE CERTAIN WRITE PROTECT SLOT IN ENVELOPE IS UNCOVERED PERFORM WRI TE PROTECT ASSEMBLY ADJ Par 6 6 8 CHECK WRITE PROTECT SIGNAL ATUI5 PIN II REPLACE WRITE PROTECT ASSEMBLY 6 17 ...

Page 62: ... 1 To adjust the metal carriage stop assembly Figure 6b follow the procedure given in 6 6 1 2 6 6 1 1 Pldstic Carriage Stop Assembly a Place outer stop gauge CDC P N 83401400 against carriage as shown in Figure 6 6 b Loosen outer carriage stop screw see Figure 6 6 and move outer stop until tooth contacts stop gauge af shown in Figure 6 6 Tighten stop screw and remove gauge c Step Read Write head t...

Page 63: ...u o CARRIAGE STOP o AQ67 E _ _ BEARING RETAINER UPPER HARNESS WITH J5 Figure 6 5 Base and Chassis Support Assembly 77834769 U 6 19 CHASSIS SUPPORT c SSEMBLY SOCKET HEAD SCREW ...

Page 64: ...OUNTING BRACKET PHOTO TRANSISTOR MOUNTING NUT INNER CARRIAGE STOP OUTER CARRIAGE STOP a Plastic Carriage Stop and Stop Gauge Assemblies i SPINDLE FORWARD SCREW CARRIAGE GUIDE BAR 77834769 H b Metal Carriage Stop Assembly Figure 6 6 Carriage Stop Adjustment 6 19 1 c c ...

Page 65: ...USTMENT The Alignment Diskette is used to perform this procedure a Precondition the alignment diskette 421 51W by allowing it to reach room temperature for one hour b Install the alignment diskette The Alignment Diskette is for read only Extreme caution should be used to assure this diskette is not written on c Seek to Track Zero then seek to Track One and Read No data is recorded on Track One d C...

Page 66: ...to o 5ms div and verify that the index pulse width measures 1 5 O 7ms from o 8ms to 2 2ms If the index pulse width is not within specification adjust the LED sensor located onthe top plate assembly If the pulse width cannot be adjusted to meet specification the sensor assembly or PWA must be replaced and steps a through f repeated g A ll scope settings are to remain as defined in the original setu...

Page 67: ...scope to TP3 on the PWA and Channel 2 to TP4 on the PWA e Connect the external sync probe to index at TP14 on PWA f Set up the scope as follows Channell volts div to 0 1 volts div Channel 2 volts div to 0 1 olts div inverted Channell input to AC Channel 2 inputs to AC Vertical Mode to Add Slope Sync to Positive Trigger Source to External Trigger Coupling to Low Frequency High Frequency Reject Trig...

Page 68: ...track 38 Verify that the 5mv specification is still met If the specification is not met read just the stepper motor return to zero and seek back to track 38 Repeat the adjust ment until the 5mv specification is met j Remove alignment diskette k Perform Track 00 Switch Adjustment Paragraph 6 6 9 1 Perform Stop Gauge Adjustment per Paragraph 6 6 1 m Recheck all adjustments made in this procedure and...

Page 69: ... if switch and door are out of sync b With door closed adjust set screw at end of disk load arm Figure 6 9 while holding door closed against metal stop Adjust set screw until micro switch is almost adjusted flush to top of switch case This ensures that as the nylon tips on the push rod wear down the switch will still close STEPPER MOTOR CLAMP MTG SCREWS 77834769 A AC CONNECTOR RETAINING RING Figur...

Page 70: ...ath bail b Energize solenoid c Loosen mounting screw on bail Figure 6 10 d Adjust Bail so the foam pad touches the feeler gauge NOTE On early units the bail did not have a convex dimple and guide slot When adjusting these units the spacing must be checked at both ends of the bail to ensure it is parallel to the boss e Tighten mounting screw 6 24 TANG FEELER GAUGE 1 B 5 _ Figure 6 10 Disk Load Sole...

Page 71: ...1 d Complete door closing slowly Visually verify that all segments on the cone that can be seen are fully seated in the spindle Slowly rotate spindle and verify that all cone segments are seated and that the segments do not seat as the spindle is rotated as evidenced by a clicking sound or observing the segments seating e Repeat fully opening and closing door four times Verify that after each clos...

Page 72: ...envelope c Tighten the mount screws and re check to verify signal under all conditions of envelope position 6 6 9 TRACK 00 SWITCH ADJUSTMEN T Perform the procedure given below whenever the Track 00 switch has been re placed or the device fails to give current Track 00 indication or if the head has been realigned a Step the Read Write head out to Track 01 b Place a 0 010 0 254 mm feeler gauge betwe...

Page 73: ...cuit board see Figure 6 1 Remove four 4 socket head screws securing chassis support Figure G S Slide chassis support back far enough to clear push rod Figure 6 16 of front panel and lift support clear of chassis Remove two 2 screws securing bearing retainer Figure 6 5 Remove stepper motor clamp by removing two socket head screws Figure 6 5 Remove Cable Clamp Carefully slide actuator assembly stepp...

Page 74: ...d to chassis this will assure proper tension on bearings If a gap exists between bearing and retainer or if bearing is being bound up by retainer this angle must be checked I Perform Actuator Alignment Procedure paragraph 6 6 3 m Perform Spindle and Cone Adjustment paragraph 6 6 7 n Perform Push Rod Travel Adjustment paragraph 6 6 4 DRIVE MOTOR DUAL DIAM REVERSIBLE PULLEY CIRCUIT BOARD MT HERE WIT...

Page 75: ...e used pad with a sharp tool if necessary and discard Be sure to remove all of the old pad and adhesive Alcohol may be used to remove the old adhesive f emove the protective backing from the new head load pad and position pad in center of recess of head load arm Press pad firmly to insure adhesion with a clean tongue depressor or with thumb using a lint free cloth to pro tect the pad from grease o...

Page 76: ...and coil core g Insert a 0 058 in 1 47mm wire feeler gauge in gap between underside of clapper and coil core h If 0 058 in 1 47mm feeler gauge will not fit bend tang up slightly i Continue checking with the 062 inch 1 58mm wire gauge feeler and O 058 inch 1 47nlm wire gauge until the following condition is achieved 1 0 062 inch 1 58mm feeler gauge will not pass between tang and clapper 2 0 058 inc...

Page 77: ...eversing the dual diameter rever sible pulley on the spindle nl0tor shaft Figure 6 12 using the following steps a Remove AC power b Remove Printed Circuit Board Assembly per paragraph 6 7 1 c Remove the belt from the spindle motor pulley Accessible from the under side of unit d Loosen set screw and remove pulley e Reverse pulley and replace on motor shaft Position pulley allowing 0 079 2 01 mm O 0...

Page 78: ...ELT 6 32 60 HZ CONFIGURATION BOTTOM SURFACE OF BASE CASTING MOUNTING SCREW SHOULDER 50 HZ CONFIGURATION BOTTOM SURFACE OF BASE CASTING MOUNTING SCREW SHOULDER Figure 6 15 Drive Pulley Reversal 77834769 K ...

Page 79: ...of this indicator indicates the conditions that are necessary to satisfy the function of the logic block The presence of the tri angle indicates a 0 logic level on that line is needed to satisfy the function The absence of the triangle indicates a logical 1 is needed to satisfy the function The relative level indicator depicts the occurrence of inversion Figure 7 1 shows some representative exampl...

Page 80: ...nONE SHOT L SUMMING CIRCUIT NUMBER FOllOWING EXAMPLE 100 INDICATES GAIN OF 100 X V lEVEL CONVERSION TRANSMISSION liNE TO lOGIC lEVEL SWITCH STATE TO lOGIC lEVEL OR lOGIC lEVEL TO POWER OUTPUT SCHMITT TRIGGER lOWER TRIP POINT ADJUSTABLE GENERAL SYMBOLS INDICATES NON STANDARD lOGIC lEVEL x INDICATES ANALOG SIGNAL L TEST POINTS INHIBITING INPUT Figure 7 3 Schematic Symbols 7 2 77834769 A ...

Page 81: ...with Table 8 1 Figure 8 1 serves two purposes 1 When used with Table 8 1 it identifies all unique parts and assemblies for each FDD variation 2 It identifies by sheet location where all major assemblies are broken down 8 4 1 TOP MECHANICAL ASSEMBLY TMA To determine what parts are used on a particular model find the applicable model in Table 8 1 The corresponding item number represents the last ree...

Page 82: ...OOXOOOOO 0000000000 BR8A2D 032 XOOOOXOOOO 0000000000 OXOOXXOOOO OXOOOOOXOO XXOXOXXOOO OOOOXOOOOO 0000000000 BR8A2E 033 XOOOXOOOOO 0000000000 OXOOXXOOOO OXOOOOOXOO XXOXOXXOOO OOOOXOOOOO 0000000000 BRBA2F 034 XOOOOOOOOO OOxOOOOOOO OXOOOXOOOO OXOOOOXOOO XXOXOXXOOO OOOOXOOOOO 0000000000 BR8A2G 035 XXOOOOOOOO 0000000000 OXOOXXOOOO oooooooxoo xxoxoxxooo OOOOXOOOOO OOOOOOOOOX BR8A2H 036 XOOOOOOOOO 000000...

Page 83: ...ISKETTE DETECT ASM THA 168 DRIVE MOTOR ASM 60HZ TMA 169 DRIVE MOTOR AS 1 50HZ T IA 170 DRIVE MOTOR ASM 60 HZ TI A 336 FRONT PANEL ASM THA FRONT PANEL ASH TI A FRONT PANEJ ASM TMA FRONT PANEL ASH THA FRONT PANEL ASH TI A FRONT PANEL ASH TMA ACTUATOR ASH TMA ACTUATOR ASH TMA UPPER HARNESS ASI1 THA UPPER HARNESS ASH TMA LmlER HARNES ASH TMA LOWER HARNESS ASH TMA CONNECTOR BRACKET TMJI i tl64 144 ALTE...

Page 84: ... SPR LOCK 101 115 WASHERS PLAIN 101 115 LABEr IDENT 101 115 NUT SELF LOCK STL 8 101 115 BEARING FLANGED 101 115 WASHER SPRING WAVE 101 115 CLAMP CABLE 101 115 SCREW BIND HEAD 101 115 SCREW HEX SOC HD 101 115 SCR HEX SELF TAP 101 115 CLAMP CABLE NYLON 101 115 SCR HEX SOC HD CliP 101 115 PLATE NUT 101 115 CARRIAGE STOP 101 115 SCREW 101 115 SCREW 152 LOCK WASHER 152 ADAPTER 152 SCREN SELF TAP 101 11...

Page 85: ... TMA 101 115 101 115 101 115 101 115 101 115 101 115 101 115 101 115 101 115 101 115 101 115 101 115 171 101 115 101 171 115 101 115 101 115 101 115 101 115 101 115 I T E IDENT M NO 206 93413409 207 93411202 212 94279109 250 93592492 310 75790903 311 93426400 312 77830481 313 93402200 314 92033029 315 93409701 316 94047069 317 94047070 320 75912011 321 75292907 322 75813201 323 75913202 353 757244...

Page 86: ... C RRIAGE ASM SPRING CARRIAGE SCR SOC HP CAP RETAINER BEl RING BEARING FLANGED BRG BALL EXT INNER R WASHER SPRING WAVE Ll1BRICANT PAD HEAD LOAD CARRIAGE ASSY ARM HEAD LOAD WILDER PAD ASSY PIN C RRIAGE SPRING TORSION WASHER SPECIAL SCREW SLOTTED SCREW HEX HD WASHER 284 285 i 375 t 289 91 A 290 335 288 V 334 WHERE USED TMA TrIA 137 138 137 138 326 137 138 137 137 138 281 318 137 138 137 138 137 138 ...

Page 87: ...111 112 234 83435402 C lNNECTOR 128 139 236 83435501 CnNTACT PIN 102 128 236 83435501 CONTACT PIN 139 238 51797233 TERMINAL 102 128 238 51797233 TERMINAL 114 139 239 62121108 TERMINAL 108 110 239 62121108 TERMINAL 114 128 239 62121108 TERMINAL 139 240 15003254 WIRE YELLOW 102 128 240 15003254 WIPE YELLOW 129 130 240 15003254 WIRE YELLOW 114 139 241 15003309 WIRE 106 110 241 15003309 WIRE 114 128 2...

Page 88: ...ACT 254 10125759 SCREW FLAT HD 258 93592164 SCR HX SELF TAP 258 93592164 SCR HX SELF TAP 259 77835305 LABEL 260 75791600 MOUNT 261 75724402 SWITCH 262 75293956 CONNECTOR 264 77594403 MOUNT 307 77830550 SOLID STATE RELAY 308 10127334 SCREW 309 10125105 NUT 324 75893025 MOUNT 354 09000004 SCREW BIND HEAD 355 75885407 OPTICAL SWITCH 374 94277400 TIE STRAP 386 10125102 SCR NUT HEX 387 10126100 WASH IN...

Page 89: ...200 SPRING LATCH 131 136 268 83401200 SPRING LATCH 161 170 269 83413406 SCR SET SOC HD 6 32 131 136 269 83413406 SCR SET SOC HD 6 32 161 170 271 75292701 KNOB LEVER 161 272 83413404 SCREW SELF LOCKING 131 136 272 83413404 SCREW SELF LOCKING 161 170 273 83426621 PANEL FRONT BLACK HW 133 274 75812121 DOOR FINISHED PA BLK 133 M NO DESCRIPTION USED 275 83426622 276 75812122 277 83426623 278 75812123 2...

Page 90: ...75884657 LEAF SPRING 150 75898086 HARNESS 150 83402301 LATCH DOOR INJEC HOL 150 92096099 PIN GROOVED 150 75292700 KNOB LEVEll 150 83401200 SPRING LATCH 150 83413406 SCR SET soC HD 6 32 150 83413404 SCREW SELF LOCKING 150 758121 24 DOOR FINISHP D BLACK 150 83403202 BAR TORSION DOOR 150 83461111 FR0NT PANEL 150 75810703 RETAINING RING 150 75810701 DIOnF LIGHT 150 83401500 BUSHING DOOR INJF CT 150 75...

Page 91: ...locations 8 6 3 CROSS REFERENCE INDEX a Lists all parts in numeric sequence by Identification Number b In conjunction with the referenced sheet number third column and illustrations defines the physical location of each item identified 8 6 4 SHEET NUMBER REFERENCING Sheet number references of Parts Lists and lliustrations refers to sheet locations in this section Example Sheet reference 3 represen...

Page 92: ... HEX WSR HD 161 170 S9 132 83401801 FRONT PANEL ASM TI1A S9 216 93592080 SCR HEX WSR HD 150 S10 133 83401802 FRONT PANEL ASM TMA S3 217 75884657 LEAF SPRING 131 136 S9 C 133 83401802 FRONT PANEL ASM TMA S9 217 75884657 LEAF SPRING 161 170 S9 134 83401803 FRONT PANEL ASI TIIA S3 217 75884657 LEAF SPRING 150 S10 134 83401803 FRONT PANEL ASM TMA S9 218 75882450 CARRIAGE STOP 101 115 S4 135 83401804 F...

Page 93: ...01 115 S4 277 83426623 PANEL FRONT FIN BLUE 135 S9 362 75747000 SPACER BEARING 101 115 s4 278 75812123 DOOR FINISHED PA BLU 135 S9 363 75745200 PULLEY SPINDLE 101 115 S4 279 83461110 FRONT PANEL FINISHED 136 S9 364 75886087 BASE MF CHANISM DIE 115 S4 280 75747801 STEPPER KlTOR ASM 137 138 s6 365 83461800 CLAMP STEPPER MOTOR 101 115 s4 0 281 77839902 CARRIAGE ASH 137 S6 366 75292400 GUIDE CARRIAGE ...

Page 94: ...881371 59 295 77835133 59 337 93464000 57 239 62121108 57 109 75881775 53 189 77835200 55 347 93464555 57 239 62121108 57 109 75881775 57 373 77 835304 56 291 93529001 56 145 75272300 53 108 75881778 53 259 77 835305 58 192 93529005 54 370 75273000 55 108 75881778 57 164 77836055 53 247 93530103 59 172 75273200 55 128 75881779 53 318 77839901 56 237 93541002 58 124 75291902 53 128 75881779 57 281 ...

Page 95: ...nsistor Emitter Photo Transistor Collector J3 5 J3 3 J3 2 J3 4 J3 1 9 4 STEPPER MOTOR Wire Color Origin Destination Brown Stepper l Iotor J4 1 Red Stepper Motor J4 2 Orange Stepper Motor J4 3 Black Stepper Motor J4 4 9 5 WRITE PROTECT Wire Color Origin Destination Blue LED Cathode J6 1 Red Phototransistor Collector J6 2 Green LED Anode J6 3 White Phototransistor Emitter J6 4 77834769 A Approximate...

Page 96: ...c ...

Page 97: ...re to be directed to t e Business Management Office BMO State Zip Code If necessary call us at 405 946 5421 extensions 4436 or 4748 Publications Area Code Phone or 4552 or 4308 Business Management Equipment__________________ Serial Number_____ Purchased from ___________ Document Title Number Revision _____________________________________ COMMENTS NO POSTAGE REQUI RED IF MAILED IN THE UNITED STATES...

Page 98: ...essary If Mailed in the United States POSTAGE WILL BE PAID BY MAGNETIC PERIPHERALS INC p o BOX 12313 OKLAHOMA CITY OKLAHOMA 73157 o Attention Technical Publications OKH144 o Attention Business Management OKH013 FIRST CLASS Permit Number 1332 OKLAHOMA CITY OKLAHOMA FOLD FOLD c ...

Page 99: ......

Page 100: ...CORPORATE HEADQUARTERS P O BOX 0 MINNEAPOLIS MINN 55440 LITHO IN U S A SALES OFFICES AND SERVICE CENTERS IN MAJOR CITIES THROUGHOUT THE WORLD CS CONTR OL DATA COI POR TION ...

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