Control Data Corporation 5R2A5 Operation Manual Download

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Summary of Contents for 5R2A5

Page 1: ...CONTROL DATA DISK STORAGE UNIT 5R2A5 6ENERAL DESCRIPTION OPERATION INSTALLATION AND CHECKOUT THEORY OF OPERATION MAINTENANCE CONTROL DATA C OR P0 RATION CUSTOMER ENGINEERING MANUAL...

Page 2: ...Incorporates Engineering Change Order PE3 1156 Field Change Order PE3ll57 and Technical 9 7 72 Corrections affecting pages ii iii iv 6 5 6 6 6 25 6 27 H Incorporates Engineering Change Order PE3 1283...

Page 3: ...A 4 12 B 4 13 B 4 14 A 4 15 A 4 16 A 4 17 A 4 18 A 4 19 A 4 20 A 4 21 A 4 22 B 4 23 K 4 24 K 4 25 B 4 26 K 4 27 A 4 28 B 4 29 A 4 30 B 4 31 A 4 32 A PAGE NUMBER REV 4 33 A 4 34 A 4 35 A 4 36 A 4 37 A...

Page 4: ...US CHECK SHEET 70614600 Sheet 2 of 2 BR2A5 Disk Storage Unit Maintenance Manual REVISION L PAGE NUMBER REV 6 51 L 6 52 6 53 L 6 54 A 6 55 A 6 56 A 6 57 A 6 58 A PAGE NUMBER REV 6 59 A Sec7 8 9 10 Cmt...

Page 5: ...anuals and provides all information needed to install operate and maintain the unit Publication No 70614600 General Description Operation Installation and Checkout Theory of Operation Maintenance Publ...

Page 6: ......

Page 7: ...Power On Sequence Power Off Sequence Logic Chassis Deck Assembly Drive Motor Assembly Hysteresis Brake Assembly Spindle Assembly Actuator Transducers Track Servo Disk Cleaner Assembly Blower System D...

Page 8: ...ent Index Transducer Removal and Replacement Transducer Output Check Shroud Adjustment Disk Cleaner Assembly Check Adjustment Removal and Replacement Head Select Preamplifier Card Removal and Replacem...

Page 9: ...lation or Removal 6 17 Symmetry Adjustment 6 20 Read Oscillator Output Waveform 6 21 Symmetry Strobe Relation 6 22 Main Deck Underside 6 24 Motor and Brake Assembly 6 26 Index Sensor 6 33 Index to Bur...

Page 10: ...C C CI C...

Page 11: ...SECTION 1 GENERAL DESCRIPTION 4A...

Page 12: ......

Page 13: ...eripheral Logic SPL cards involved in track detection and Read Write operations This assembly also includes spindle assembly spindle drive motor and shroud the mounting and operational facilities requ...

Page 14: ...ling air to the power supply and logic chassis EQUIPMENT SPECIFICATIONS ACCESSING TIME C Maximum Access Time 70 ms Maximum One Track Access Time 10 ms Average Access Time 35 ms C RECORDING Mode Double...

Page 15: ...nal Magnetic Oxide 2400 2 rpm 19 0 004 inch nominal 0 0055 inch nominal 0 00505 inch nominal 0 045 inch nominal Height Width Depth Weight ELECTRICAL 38 inches 96 52 cm 27 1 2 inches 69 85 cm 37 1 2 in...

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Page 17: ...SECTION 2 OPERATION...

Page 18: ......

Page 19: ...on Operator Panel START switch indicator Switch energizes when pressed to light spindle drive motor and begins the First Seek sequence provided the following conditions are met 1 Disk pack is in place...

Page 20: ...assis maintenance panel DC switch is set to OFF or the ON LINE OFF LINE switch is set to OFF LINE Switch when pressed to light inhibits the ability of the related DSU to perform a write operation Swit...

Page 21: ...the nine DSU Address lines to the control unit Lens of plug reflects the number corresponding to the line signalling the control unit A DSU in which a plug labeled 5 is installed will not be used by t...

Page 22: ...he circuitry involved to clear the DSB registers it may be necessary to depress the switch twice to clear the fault Lights whenever one of the FF s in the Error register is set Is not dependent upon p...

Page 23: ...s the 20 vac brush motor drive circuit DC ON indicator Provides a remote indication of the position of the logic chassis maintenance panel DC switch SPINDLE MOTOR circuit breaker Circuit breaker contr...

Page 24: ...cator lights when breaker is on Deck Assembly Track number indicator Vernier scale located near top of carriage beside read write heads Readable only when top cover is raised Fixed 0 mark identifies t...

Page 25: ...0 LOGIC CHASSIS MAINTENANCE PANEL I 34V STATUS 36v 40V DC Q ON LINE ON OFF LINE OFF FILTER BOX START BEREIT JWARTUNG ISCHREIBENI FEJ I GESPERRTI OPERATOR PANEL 40V SV SV Soy 20V 11Li O1 SV 20V DRV 40V...

Page 26: ...Close the rear panel The blower motor will begin to operate 5 Open the front panel of the DSU cabinet and position the power supply switches as follows SPINDLE MOTOR circuit breaker to ON 9units with...

Page 27: ...d write heads are sometimes manually positioned Make certain that the heads are fully retracted 4 Place the disk pack onto the spindle CAUTION Too rapid rotation of the pack in the following step will...

Page 28: ...rocedures the read write heads are sometimes manually positioned Make certain that the heads are fully retracted 4 Place the plastic cannister over the mounted disk pack so that the post protruding fr...

Page 29: ...SECTION 3 INSTALLATION AND CHECKOUT...

Page 30: ...i 40 I I 0 0 0 i...

Page 31: ...over interlock switch 5 Remove the four rubber shipping clicks located at the corners between the main deck and frame CAUTION Do not position the carriage manually Such action could cause the read wri...

Page 32: ...er Repeat the process for the remaining three casters 3 Position the DSU to its operational location and lower each jack screw until the casters no longer contact the floor 4 Place a spirit level on m...

Page 33: ...Figure 3 1 Cabinet Intracabling Diagram I I USED ON BR2A5B ONLY CONNECTOR PANEL 70614600 J 3 3...

Page 34: ...output cables All input output cables exit the cabinet near the rear door Table 3 1 provides information relative to the connector pin signal assignments for these cables Figure 3 2 System Intercabli...

Page 35: ...3 26 File Bus In 3 74 77 File Bus Out 1 1 4 File Bus In 4 80 79 File Bus Out 2 8 12 File Bus In 5 75 78 File Bus Out 3 15 18 File Bus In 6 67 72 File Bus Out 4 28 31 File Bus In 7 54 57 File Bus Out 5...

Page 36: ...r mils minimum or a copper strap of 5900 square mils minimum must be connected between each DSU and the controller The ground bond is connected to the GND terminal on the filter box located in the rea...

Page 37: ...lative humidity providing there is no condensation INITIAL CHECKOUT AND STARTUP PROCEDURE This procedure should be used to make the first power application to the DSU The procedure assumes that the pr...

Page 38: ...tated back from shroud openings Q 11 Close top cover 12 Use a vacuum cleaner to remove any dust or dirt from interior of shroud and C cabinet 13 Install disk pack 14 Inspect and clean disk pack see Pr...

Page 39: ...up NOTE Further activity ceases until brush motor finishes driving the cleaning brushes over disk pack surfaces 23 When brushes are returned to a position clear of disk pack the positioner drives car...

Page 40: ...CO COO CEDC CO C C C C flfl...

Page 41: ...SECTION 4 THEORY OF OPERATION 0...

Page 42: ...flflF fl...

Page 43: ...rmed by a DSTJ The functions are as follows First Seek Direct Forward or Reverse Seek details Servo operation Return to Zero Seek RTZS Read Write Erase Each of these functions is further described by...

Page 44: ...SIGNAL FLOW OF SELECT SEQUENCE Figure 4 2 Select Sequence CONTROLLER L POWER INTERLOCK COP RECEIVER 1 C C C C C C C 7E4 Figure 4 1 Input Output Signal Gating 7E5 4 2 70614600 A...

Page 45: ...RECEIVERS I O CONN STEERING LOGIC J200 I O CONN J200 7 E6 Figure 4 3 Block Diagram 70614600 A 4 3...

Page 46: ...Controller Power Interlock COP File Bus Out FBOUT lines 9 C C C C C C File Bus Tag Lines Out Lines Difference Head Direction Request Command Tag Tag Tag Tag FBOUT 0 1 Head Address DSB1 A lH gates Wri...

Page 47: ...32 DSB Clear DSB Clear Disable DSB Clear Disable A Disable A A 1 prevents 1 H prevents clearing H 1 t prevents clearing of Status of Status Byte clearing of Byte Status Byte FBOUT 6 64 Return to Zero...

Page 48: ...ontents are provided to the controller via the File Bus In FBIN lines described under Output Lines in this table The occurrence of a on Request Tag always causes a Request Return signal to the control...

Page 49: ...the controller with 8 information relative to the DSU 1 s status Three separate sets of status information can appear on the FBIN lines The origin of the three information sets and the signal conditi...

Page 50: ...t SCHREIBEN GESPERRT is off FBIN 4 Seek Finished A 1 level indicates the occurrence of one or more of the following 1 Completion of commanded direct seek operation 2 Completion of commanded RTZ seek o...

Page 51: ...used The content of the DSB1 register is cleared by any one Signal Condition of the following Request Tag AND 1 Trailing edge of Request Tag AND FBOUT 1 AND FBOUT 0 DSB1 FBOUT 5 2 Head Direction Tag A...

Page 52: ...Read and Write Inner or Outer selected at the same time 3 Read and Erase selected at the same time 4 Erase and no write driver on 5 Erase and both write drivers on 6 One or both write drivers on and...

Page 53: ...ad Advance gated by Command Tag caused the Head Address register to contain an illegal head address FBIN 1 Write Return A i t level indicates that a Write Inner or Outer command was received FEIN 2 Re...

Page 54: ...power to the brush motor starts a 20 second approximately disk cleaning cycle When the disk pack speed reaches 2000 rpm the power supply relay K5 energizes to enable completion of the First Seek Tran...

Page 55: ...4 1 and 4 2 DIRECT FORWARD REVERSE SEEK The Direct Seek function involves those operations that must be performed to move the read write heads from their current track or cylinder location to the one...

Page 56: ...y Seek gates the output of the desired velocity function generator coarse position error to the summing amplifier Since the carriage is stationary no Velocity signal exists to balance the Position Err...

Page 57: ...a 0000 00n0 00rz 0000 0 nn ocn C 0 0 C C cr1 TO OIFTfl1CNCE CNTEP Figure 4 4 Servo Circuit Block Diagram...

Page 58: ...PED SIGNAL FROM POSITION CONVERTER T 64 176 TRACK FORWARD SEEK 32 TRACK REVERSE SEEK STOP T32 STOP VELOCITY AMPLIFIER VELOCITY CYLINDER ERROR MAX ON CYLINDER 0 MAX NEG VOICE COIL POSITION ER CURRENT P...

Page 59: ...steps controlled by D A converter as last 32 tracks of a Seek are crossed Desired Velocity Function Processes Position Error signal at gain levels that Generator vary as Position Error decreases When...

Page 60: ...Also receives a negative feedback from positioner which acts to cancel current coupling that occurs from the velocity transducer location within the magnetic field created when current is applied to...

Page 61: ...signals Cylinder Pulse Detection Observe switching level detection circuit to derive pulses representing tracks being crossed or carriage motion limits being passed Cylinder pulses increment differenc...

Page 62: ...eep the velocity Signal Position Error signal difference to zero C When the difference counter indicates one track to go to the desired destination the coarse gate is disabled and the fine gate is ena...

Page 63: ...roller responds to a Seek Error signal from a unit by sending a Command Tag that gates a 1 on bit 6 RTZS pulse to the afflicted unit The RTZS pulse sets the Load FF Forward Latch FF and Seek FF It als...

Page 64: ...eded 400 ms a Seek Incomplete signal would have replaced the Seek Finished signal The deck is now ready to perform a Read a Write or a Seek Direct or RTZS operation 0 READ WRITE ERASE A Seek Finished...

Page 65: ...he event of maintenance requirements The power supply is cooled by air delivered through two flexible ducts from the blower assembly AC DC Distribution Figure 4 7 Input power is made available to the...

Page 66: ...wmdings are applied to rectifier filter circuits A fifth voltage is similarly derived but is used exclusively by relay K5 Three of the four circuits 40v 20v and 20v incorporate boost buck transformers...

Page 67: ...e begins when switch S501 on the operator panel is pressed so as to light the related indicator The progression of the sequence assumes that all power supply circuit breakers are on that all power sup...

Page 68: ...transfers to the in progress position SSW3 switches the spindle motor start windings and drops out at approximately 1000 rpm 4 The closing contacts of K3 distribute 5 vdc and 20 vdc to the logic chass...

Page 69: ...is removes the remaining ground to SSW4 and disables the brush motor It also signals completion of the brush cycle to the logic chassis Figure 4 7 8 Completion of the brush cycle allows the start of t...

Page 70: ...gizes the contacts of K2 will cause an emergency retract as follows a One set of contacts disconnects the rectifier from the 36 volt side of the power amplifier Figure 4 7 Another set gates the 36 vol...

Page 71: ...y Figure 4 9 is responsible for the dynamic operations of a DSU driving disk packs and loading and positioning the read write heads The deck assembly consists of a deck plate on which are mounted a dr...

Page 72: ...ADING CAMS ACTUATOR S LOT SPINDLE ACTUATOR HOUSING SPI NDLE DRIVE PULLEY SPIN DLE LOCK DETENT WHEEL BRAKE PAWL RATCHET BRAKE LINKAGE BRAKE V BELT PACK ON SWI TCH HYSTERESIS BRAKE BELT DRIVE MOTOR PULL...

Page 73: ...causing the cup and brake shaft to decelerate Brake deceleration in turn causes spindle motor deceleration Spindle Assembly The spindle assembly is the physical interface between a SDU and a disk pac...

Page 74: ...y A friction plate and pad comprise a clutch mechanism that protects the lockshaft from damage that could result from improper disk pack loading technique C C C 0 C INTERNAL THREADS DOWEL PIN C 0 0 SW...

Page 75: ...uses a magnetic field about the voice coil positioner This magnetic field reacts with the permanent magnetic field existing around the magnet assembly The reaction either draws the voice coil into the...

Page 76: ...ASSEMBLY Figure 4 11 Actuator Assembly Elements MAGNET ASSEMBLY C3 C C C ACTUATOR CARRIAGE RETRACTE D _ 2 ACTUATOR VELOCITY TRANSDUC ER VELOCITY TRANSDUC ER I _ HOUSING COIL HOUS ING MAGNET ______ VO...

Page 77: ...redetermined rpm The actuator components involved in these operations are identified in Figure 4 12 Head loading amounts to allowing spring pressure of the floating arm part of head arm assembly to mo...

Page 78: ...pack the logic specifies a forward seek and the carriage moves forward toward the spindle and the forward end of travel marker part of position transducer Head loading occurs during this forward motio...

Page 79: ...methods can be used Refer to Power Off Sequence for additional information As the carriage retracts the cam surfaces encounter the head arms and each head rides vertically away from the related disk...

Page 80: ...loat on the air cushion Vertical motion by a disk surface due to warpage or imperfection is countered by a move in the opposite direction by the gimballed head and or floating arm As a result flight h...

Page 81: ...ntinued operation Multiple sectored disk packs have two closely spaced notches called index Unsectored disk packs have a single notch called index These notches indicate the beginning of a revolution...

Page 82: ...ally similar to the read write heads but contains no erase coil Information sensed by the head is prerecorded during manufacture on the related disk surface of the disk pack The information consists o...

Page 83: ...the movement over the last one half track of any seek operation as the fine position analog signal stopping signal Refer to the Direct Seek paragraph for a detailed discussion of the fine position ana...

Page 84: ...ndle until the linkage causes a reversal in direction As the brushes return to the original position clear of disk pack the reset switch is encountered and transfers to disable power to the motor C Th...

Page 85: ...ERO CROSSING DETECTION NEGATIVE I I I I CYLINDER PULSES TRACKO I 2 3 END OF TRAVEL DETECTOR TRACK SERVO HEAD CARRIAGE MOVING 500KHZ FILTER 455 KHZ FILTER DEMODULATOR 500 KHZ DEMODULATOR 455 KHZ AGC AM...

Page 86: ...system consists of a motor driven impeller that draws air in through the primary filter in the bottom of the unit A portion of this air is forced through an absolute Q filter glass and asbestos and r...

Page 87: ...transducer The pulse outputs of the transducer are used to determine disk pack rpm and to detect organizational segments of the disk pack The lower hub of the disk pack contains a replaceable filter T...

Page 88: ...0 0 0 0 0 0 0 0 0 0 3O 0 0 0 000 0 0 C...

Page 89: ...SECTION 5 DIA GRA MS Information for this section is contained in BR2A5 Disk Storage Unit Pub No 70614700...

Page 90: ...C C C 0 0 0 C 0 C C DOD DOCC...

Page 91: ...7 D D D 2DNVN2INIVW 9 NOLLD S...

Page 92: ...I 3 C 1...

Page 93: ...ol Control Data Part Number AC DC Volt Ohmmeter Ballantine Labs Inc Model 345 or equivalent Belt Tension Gage 84267100 CE Disk Pack 89259000 Card Extender Half size 54099700 Card Extender Full size 54...

Page 94: ...tic Spatulas Commercially available Tape Adhesive Commercially available C PREVENTIVE MAINTENANCE C GENERAL C Performance of the DSU is dependent upon the proper and timely execution of a preventive m...

Page 95: ...vel 5 Annually or 6 000 hours Intervals are maximum times Preventive maintenance may be required more frequently depending on dust contamination level of operating area INSPECT ACTUATOR ASSEMBLY 1 Rai...

Page 96: ...ker to OFF 3 Remove primary filter Figure 6 1 4 Install replacement filter P N 92682017 C C C C C C POWER SUPPLY FRONT PANEL TO UNDERSIDE OF DECK TO LOGIC CHASSI TO POWER SUPPLY ABSOLUTE FILTER CABI N...

Page 97: ...ks forward and 140 tracks reverse continuously from track 0 4 Use an AC DC volt ohmmeter to measure output voltages at corresponding test jacks on logic chassis maintenance panel a Measure 40 volts Do...

Page 98: ...t entire head arm assembly must be replaced a Use dental mirror to inspect face of each head for reddish brown oxide deposits Clean a head only if deposits exist see step 3 b If scratches are found re...

Page 99: ...east three inches away from any part of the magnet assembly Erasure of data can occur 2 Open top cover 3 Remove disk pack Avoid contact with index transducer 4 Clean shroud with a lint free gauze that...

Page 100: ...trument to clean lockshaft threads on top end of spindle 5 Apply a thin coat of oil P N 95020400 to threads REPLACE ABSOLUTE FILTER C 1 Open cabinet rear panel and set filter box circuit breaker to OF...

Page 101: ...mitter or receiver card from the logic chassis It is recommended that maintenance personnel read the entire procedure prior to performing the instructions of the procedure Procedures requiring oscillo...

Page 102: ...of gauze with isopropyl alcohol and wipe clean the exposed top surface of disk pack Dry the surface C 14 Use alcohol dampened gauze to clean both pieces of disk pack container 15 Wipe container dry 16...

Page 103: ...unit Start spindle motor and allow brush cycle to end Manually position carriage forward to load read write heads Allow heads to remain over disk surfaces Operate in this configuration for 30 minutes...

Page 104: ...to track 146 15 Adjust oscilloscope sweep so that three cross over points nulls span exactly C 10 centimeters Figure 6 4 16 Carefully move carriage to achieve an oscilloscope display that is as close...

Page 105: ...Card Location Head Test Point No Card Location 0 2 4 6 8 10 12 E01 1 3 4 5 7 9 11 E02 14 16 and 18 13 15 and 17 20 Adjust oscilloscope sweep so that three cross over points nulls span exactly 10 centi...

Page 106: ...motion is required to make the adjustment The clamp nuts securing the head arm clamps need not be loosened b Moving tool laterally parallel to head arm length reposition head arm until center cross o...

Page 107: ...rmine location of faulty head arm assembly 6 Remove head cable clamp assembly and disconnect head plug at card E01 or E02 as applicable 7 Remove clamp nuts securing clamp bar and washer s against faul...

Page 108: ...times If the assembly is allowed to unflex it may cause damage to itself and or an adjacent assembly 4 Keep all contact with adjacent heads to minimum This will save realignment time later 8 Grasp th...

Page 109: ...ent assembly toward the carriage Keep contact with the assemblies above and below to a minimum When the end starts to enter the carriage notch simultaneously raise head cam surface onto cam while appl...

Page 110: ...with clamp nuts Use tools 12218425 and 87016703 to tighten clamp nuts to 6 0 0 5 in lbs 16 Replace cable clamp assembly 17 Perform Head Arm Adjustment procedure on replaced head and heads immediately...

Page 111: ...e to track 404 2 Write a data pattern of all ones with the read write head that was replaced 3 Open cabinet top cover 4 Connect channels of oscilloscope to add and invert channel B to test point F and...

Page 112: ...speed 2 Position carriage to track 405 C 3 Write a pattern of ones with each head 4 Open cabinet top cover C 5 Connect oscilloscope channels A and B to test points B and C respectively of card at loc...

Page 113: ...ts to achieve waveform in Figure 6 9 Figure 6 9 Read Oscillator Output Waveform 17 Adjust variable capacitor on edge of card at location A16 to achieve maximum waveform voltage Note that maximum volta...

Page 114: ...al graticule during the ongoing portion of the trace Point A Figure 6 9 1 L Jc C C C C 7X9 Figure 6 9 1 Symmetry Strobe Relation 22 Note whether the midpoint point B of the first negative pulse of cha...

Page 115: ...e 7 Drop drive belt from spindle drive pulley Raise other end of belt clear of drive motor pulley 8 Install replacement belt smooth side of belt against pulleys first on the spindle pulley and then ar...

Page 116: ...OTOR BRAKE ASSEMBLY MOUNTING DETAIL B RATCHET BRAKE DETAIL C 7FI6B C C C C C C C C C i INLET P LATE DECK CASTING SPACER I NSU LATOR INSULATOR FLAT WASHER LOCK WASHER SCREW 6 24 C C Figure 6 10 Main De...

Page 117: ...remove V belt pulley from faulty motor 11 Remove four screws and washers and separate motor from motor mounting plate 12 Align motor cable exit point to motor mounting plate according to Figure 6 10 S...

Page 118: ...O BRAKE PLATE 3 SCREWS 3 LOCKWASHER 0 060 0 015 0 030 2 PLACES I F DRIVE BELT SPINDLE TO MOTOR PLATE 3 SCREWS 3 LOCK WASHERS 3 FLAT WASHERS MOUNTING PLATE MOTOR V BELT TENSION CHECK SPRING ARM BELT TE...

Page 119: ...osen V belt pulley setscrew s reposition pulley along shaft Apply one drop of Loctite Grade C to setscrew s threads Torque setscrew s to 75 5 in lbs 11 Set replacement pulley on motor shaft Figure 6 1...

Page 120: ...shaft sleeve in hub to brake shaft Using a setscrew with one drop of Loctite Grade C on threads establish the dimension specified in Figure 6 11 between the pulley and motor mounting plate and secure...

Page 121: ...ck 2 Rotate linkage arm until connecting rod holds the brake pawl clear of the detent plate by 0 04 0 01 inch Figure 6 10 detail C 3 Retighten the screw through the 1inkage arm 4 Push power supply in...

Page 122: ...d above 7 Adjust switch see Check and Adjustment procedure 8 Install right side panel 9 Push power supply in and close front door GROUND SPRING CHECK AND ADJUSTMENT 1 Open cabinet front door and slide...

Page 123: ...ashers securing ground spring mount assembly to switch mount 7 Open cabinet front cover and turn spindle until brake pawl engages detent plate 8 Remove the lock nut and stop washer from the lower end...

Page 124: ...ive nuts and ten washers from screws securing spindle assembly to deck Remove the five screws 10 Close cabinet top cover and open front cover CAUTION C Do not pry on spindle mounting surface of the de...

Page 125: ...front cover and open cabinet top cover 1E Replace five bolts ten washers and five nuts Tighten this hardware evenly so that the spindle flange and deck flange are kept parallel to each other 17 Reasse...

Page 126: ...isk pack P N 89259000 on spindle Avoid contact with index transducer 7 Open cabinet top cover Manually rotate disk pack Stop rotation when edge of sector disk is nearest the inner vertical surface of...

Page 127: ...ied 7 Set ON LINE OFF LINE switch to OFF LINE 8 Set DC switch to ON 9 Start spindle motor 10 Manually position carriage to track 236 Use masking tape to secure carriage at this position 11 Select head...

Page 128: ...iggering to internal 16 Disconnect channel probes J 17 Connect channel A probe to test point C Index of card at location A02 18 Trace must indicate a logic 1 3 vdc pulse with a width of 55 0 8 25 sec...

Page 129: ...side Remove brush cover 6 Disconnect sector block cable plug and cut cable ties securing cable to positioning arm 7 Remove two screws and washers securing sector block assembly to positioning arm Figu...

Page 130: ...ement with requirements of Figure 6 15 8 If any requirement is not met replace the index transducer SHROUD ADJUSTMENT Figure 6 15 Index Transducer Trace Transducer Output Check C C C 0 0 0 0 C C C 0 0...

Page 131: ...brushes retracted Meter must indicate infinity between posts 1 and 3 with brushes in this position 5 With brushes extended continuity must exist between switch posts 1 and 3 No continuity should exist...

Page 132: ...ER BASE BRUSH LINK 6T26 4 Loosen two screws securing brush stop Place 0 020 inch shim or feeler gauge between lower brush holder and brush stop dimension A Figure 6 16 Remove slack in linkage by press...

Page 133: ...ver Remove head cable clamp assembly 4 Disconnect each head cable plug connected to edge of cards at locations EO1 E02 and E03 Figure 6 17 5 Remove two wing studs at front of preamplifier card chassis...

Page 134: ...ck or by connecting a multimeter across the switch leadwire terminals 5 Retract carriage to retracted stop C 6 Slowly extend carriage Stop carriage at point where switch transfer occurs and check dist...

Page 135: ...ation C 30 Whenever a Command is derived from the access tester card set the unit ON LINE OFF LINE switch to OFF LINE 1 Install a disk pack 2 Open cabinet rear door Connect oscilloscope channel probe...

Page 136: ...ews and washers securing velocity transducer and end cap to rear surface of magnet assembly Retain cap screws and spring located inside cap CAUTION Use care throughout following procedures so the exte...

Page 137: ...t to shipping container 12 Apply one drop of Loctite Grade C to the extension rod threads that mate with transducer magnet Thread rod into proper end of replacement magnet Tighten with fingers only 13...

Page 138: ...m in place C 4 Install carriage alignment ring P N 87351000 on spindle cone CAUTION Read Write heads must be clean to prevent damage during the following operations There is no require ment to protect...

Page 139: ...5 I A 1 6 I V1 IT I A I IS 0 002 TO 0 004 INCH I V 1 09 7F I S Figure 6 19 Carriage Alignment 9 Refer to Head Arm Removal and Replacement Procedure and install track servo head 10 Install shroud with...

Page 140: ...cabinet rear door and set DC switch to OFF I m c Swing logic chassis out and install card at location A27 on full size card extender P N 54109700 d Plug card extender into logic chassis at location A...

Page 141: ...tion A23 7 With heads loaded set the 36 volt circuit breaker to OFF Manually move the carriage slowly between tracks 00 and 50 8 Set the peak to peak amplitude to 2 0 0 4 1 0 volts by adjusting upper...

Page 142: ......

Page 143: ...rement is not met go to step 7 for units Series Code 07 and below and step 8 for units Series Code 08 and above 7 Loosen nut on resistor sliding contact just enough to allow contact to slide Repositio...

Page 144: ...stalled in logic chassis location C 30 If Commands are derived from access tester card set unit ON LINE OFF LINE switch to OFF LINE C 8 Command unit to perform a 405 track repeat seek between tracks 0...

Page 145: ...ng procedure it is necessary to Command Seek operations These commands may be derived by either suitable software and the central processor or the access tester card P N 54116100 installed in logic ch...

Page 146: ...s from one track to the next Failure to meet a requirement will generally be preceded by a trend in that direction NOTE ALL UPPER TRACES TPD A25 ALL LOWER TRACES TPJ A28 7F19 C 0 Figure 6 22 Fine Posi...

Page 147: ...ent affect the trace for each Seek operation Each adjustment of the shaft must be followed by a repeat of the 405 track scan to ensure that some other area is not now failing to meet requirements b Al...

Page 148: ...4 8 Adjust oscilloscope horizontal sensitivity to obtain one negative and one positive sloped trace approximately 2 ms cm Set vertical sensitivity to 2 v cm NOTE Velocity integrator functions to fill...

Page 149: ...isk pack and close front cover 3 Start unit and allow heads to load 4 Open cabinet rear door 5 Connect oscilloscope external trigger to test point L Forward at location A27 Trigger may be set for eith...

Page 150: ......

Page 151: ...order blank Your evaluation of this manual will be welcomed C by Control Data Corporation Any errors suggested additions or deletions or general comments may be made below Please include page number...

Page 152: ...MINN BUSINESS REPLY MAIL NO POSTAGE STAMP NECESSARY IF MAILED IN U S A 1 I C C C C C C C C C L C C C C C C C C C U z z 0 I D U POSTAGE WILL BE PAID BY CONTROL DATA CORPORATION Technical Publications...

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