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Modell 2500 Fixed Disk Drive Service Manual / Century Data Txx

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2. MEMORY MEMORY 1320 CPH 1320 ACC MTC CONTROLLER OR DUMMY BOARD HS ADAPTER RUS 4 PRINTER CONTROLLER FORMATTER RADIAL FORMATTER PROCESSOR FORMATTER BUS POWER SWITCH FRONT PANEL POWER SUPPLY 906082 001 RADIAL BUS INTERFACE INTERFACE 902014 _ 730 CONFIGURATION _ CARTRIDGE 200300 BATTERY OJ d Disc DRIVE J EXPANSION ped an L d 902016 P TT ISC DRIVE EXPANSION aS eed 902016 902015 c orse ma a DRIVE S 5 wo wo gt lt ec c a e a FAN ASSEMBLY 902795 002 MATRIX DEM PRINTER LP 7250 MODE Figure 2 6 Interconnection Diagram 610 730 System 2 9 CHAPTER 3 MAINTENANCE 3 1 INTRODUCTION This chapter contains information and instructions required to keep the drive in proper operating condition Maintenance information includes a functional description of circuit operation and preventative corrective maintenance pro cedures 3 2 GENERAL DESCRIPTION The Disc Drive Unit consists of two parts the Disc Drive which is in its own cabinet and the Disc Controller which consists of boards mounted in the CPU cabinet 3 3 SPECIAL TOOLS Special tools and test equipment required for performing maintenance are given in Table 3 1 TABLE 3 1 SPECIAL TOOLS AND TEST EQUIPMENT BFC Part Number Descript
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10. 4 4 Head Positioning and Mounting Components 4 5 Spindle Lock Assembly lt n 4 6 Spindle Assembly s sx e o o 4 7 Velocity Transducer Components and Tool e e LIST OF TABLES Table 1 1 Specifications oo oo 2 1 Operating Control Panel Indicators and Switches 2 2 Maintenance Switches e s s ecc 3 1 Special Tools and Test Equipment e e e o 3 2 Recommended BASS Diagnostics 3 3 Monthly Preventive Maintenance Schedule e e e e o 3 4 Semi Annual Preventive Maintenance Schedule 3 5 Power Supply Voltage Check e e o o 4 1 Replacement Parts for Disc Drive e e FJ w 09 D OND amp UC PN C2 CO CO F2 NN N N N e NDF CO C2 CO C2 1 INTRODUCTION 1 1 GENERAL DESCRIPTION The Model 2500 Disc Storage Unit hereafter referred to as the Disc Drive is a modular memory storage device The Disc Drive is an integral part of the 610 730 data processing system The disc controller located in the data processing system consisting of five PCB s provides a means to control power sequencing head positioning data handling error corrections and diag nostics aids for the Disc Drive The Disc Drive with its removable disc pack is a modular memory device ca
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18. s 3 7 3 4 6 Rezero Operation s e e e o c o 3 8 3 4 7 Head Retract Operation s s lt e e 3 9 3 5 Diagnostic Tests e lt e e e e e e n o o 3 9 3 5 1 Indicator Testing e s lt e o 3 9 3 5 2 Basic All Purpose Service System BASS Diagnostics 3 9 3 6 Adjustment Procedures e e lt e lt e c 3 10 3 6 1 Head Alignemtn Procedure Using VDT Boot Loader 3 10 3 6 2 Data Separator PCB Adjustment Procedure e 3 15 3 7 Mechanical Adjustments e s e 3 19 3 7 1 Carriage Actuated Microswitches e e e 3 19 3 7 2 Off Rack Microswitch and Adjustment e e e e 3 20 3 7 3 Cover Lid Spring Adjustment e 3 21 3 7 4 Lid Closed Microswitch Checkout and Adjustment e 3 22 3 7 5 Spindle Lock Assembly Adjustment e s s lt 3 23 3 7 6 Speed Transducer Checkout and Adjustment e e 3 24 3 1 7 Motor Bobbin Alignment e s s e e 3 25 TABLE CONTENTS continued CHAPTER 3 MAINTENANCE Co Co CO Co Co Co Co CO e NWO EWN Cleaning and Preventive Maintenance Read Write Heads Check s Spindle Grounding Brush and Belt Check Power Supply Checkout e s o Cleaning the Disc Pack
19. 1 Verify that the control panel START STOP switch is set to STOP and the green File Ready indicator is out 2 Unlatch the pack area lid of the disc drive and open the lid 3 Verify heads are retracted and air shroud area is clean 4 Remove lower cover from disc pack and lower the top cover with disc pack carefully onto the disc drive spindle 5 Press down the top cover handle to engage the spindle locking mech anism Rotate the handle clockwise to lock the disc pack to the spindle and to disengage the top cover 6 Lift and carefully remove the top cover from the disc drive and close pack area lid Verify lid latch locks 7 If the installed disc pack is a permanent record or a head alignment pack set READ WRITE switch on control panel to READ ONLY to protect the pack from being written on If writing is allowed set this switch to READ WRITE 8 Store the top and bottom covers of the disc pack together inside cabi net or on top of the disc drive to minimize dust accumulation inside the case To remove a disc pack from the disc drive perform the following procedures 1 Power down the disc drive by setting START STOP switch to STOP The green File Ready indicator should start flashing 2 Wait until File Ready indicator starts flashing approximately 20 seconds and then unlatch and open pack area lid 3 Separate the top and bottom covers of the disc pack Carefully lower by the handle on the top cover 2 5 CONTROL
20. 13 14 15 16 Loosen the mounting screw for the head to be aligned and torque it to 20 inch ounces see Figure 3 3 for head location Adjust the head see Figure 3 4 equal amplitude of arms A and B Torque the mount ing screw to 80 inch ounces and recheck alignment Don t lean on the drive during alignment as this will cause the alignment to change slightly Select the next head to be aligned and repeat step 11 until all heads are aligned Remove all tools and the safety pin from the T block area With all heads aligned and the safety pin removed install the air shroud and rear cover Remove the alignment pack Reload boss and verify proper disc operation by peforming a GET to all sectors with RTY 0 GET 0 1 RTY 0 AS Alignment capability with this method has proven to give alignment tolerances as close as 10 microinches 3 6 2 DATA SEPARATOR PCB ADJUSTMENT PROCEDURE Perform the following steps l 2 Degate the drive interface With the drive stopped and power turned off remove the emergency retract relay from its socket on the servo amp power supply chassis and plastic cover over the heads Turn power on install a boss or scratch pack and start the drive When the ready light stops blinking approximately 20 seconds grasp the head mounting area of the carriage and manually load the heads onto the spinning pack by moving the carriage firmly towards the spindle until the ready light goes o
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23. ZT 2 31IUM OVIY x T00 ZP ZI 039919003 100 SbEZT GAYI l 21901 100 ObbbT 301939435 Viva 100 2 Q3V2 Ill 21901 00 9851 7031109 0 N3S TOP VIEW CARD COMPONENTS FACE LEFT Plug In Card Locations Figure 3 2 3 11 5 9 Key in the following program terminal 0 starting with four digit address 0200 followed by the program end the data input with the IV key If a mistake is made terminate data input with the IV key and restart with the address where the mistake was made 0200 04 0201 E778008 0204 6906 0206 E759F0 0209 6901 0208 00 020C 0000 020 3947 0210 2408 0212 3967 0214 6326 0201 E78008 D0 D disc E78009 D1 E7800A D2 E7800B D3 0206 E759F0 cyl 496 head alignment track E75808 cyl 8 carriage way alignment check for 4219 E75B20 cyl 800 Start the program by keying the starting address 0200 followed by the IV key The disc will seek to the designated cylinder and the system will halt To restart press the LOAD key and repeat step 5 Remove the top rear cover held on by two screws and tilt the card cage back to access the read write matrix card Attach the IC clip P N R999907 to IC A3 on the read write matrix card Attach a jumper on IC A3 pins to select the desired head as follows IC A3 From To Head 12 I 0 12 2 1 12 3 2 12 3 12 5 Set up the oscilloscope as follows see Figure 3 3 Channel 1 AC 50 mV
24. ees o e e e e eee Preinstallation s lt lt lt lt s e a e e e e e Voltage Connections e e e e e e e e o e e o o Ac Power Connection e gt e e e e e e o Dc Voltage e lt s s e e e e e o e c o e Dc Power Supply Differences e e e System Initialization lt s s lt e e e gt gt gt o Loading and Unloading Disc Pack e oe o o Controls and Indicators e lt s s e e e e e e e o x Operating Procedures and Adjustments gt o Interconnection e e lt e e e Co N m e POM NY ho RO FS N N N NOONE C CO CO CO h2 e To pa p idee CONDOM Co P2 N CHAPTER 3 MAINTENANCE 3 1 Introduction e e lt e IC o o o o s o e 3 1 3 2 General Description e lt e e e o e 3 1 3 3 Special Tools s lt s e e e e e o e e e e o o 3 1 3 4 Functional Description e s e e 3 2 3 4 1 Disc Drive Operations e e e o 9 gt 9 2 3 4 2 Power Up Sequencing s e e e 3 4 3 4 3 Head Load Operation e e e s s e c 3 5 3 4 4 Seek To Cylinder Operation s lt s o 3 5 3 4 5 Track Following Operation e e
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28. 9 67 MHZ VCO 103 3 NSEC 1 6 MHZ 806 KHZ 403 KHZ Clocks Velocity Transducer Servo Drive and Emergency Retract D C Voltage Unsafe Carriage Motor Voltage amp Current Feedback Retract Relay Logic Page Number 0180 0190 0200 0210 0220 0230 0240 0250 0260 0270 0280 0290 0300 0310 0320 0330 0340 0350 0360 0370 0380 0390 0400 0410 Read Write Matrix Read Write Limiter Data Separator Data Separator Read Write Matrix Data Separator Data Separator R W Matrix R W Limiter R W Limiter R W Limiter Data Separator Data Separator Data Separator Data Separator Data Separator Logic Logic II Logic I Logic II Logic III Logic II Logic II Logic II Drive Amp Description Head Address Decoder Heads Unsafe Write Unsafe Write Data Look Ahead Back F F s Write Data Write Drive amp TP2 amp 3 Cyl Current Limiting Read To Controller Write From Controller Write NRZ Read Amplifiers Read Data Read Data Read Data Address Mark R W Read Address Mark Write Address Mark PLL Address Mark Mode Window Width VCO Read Attention Read Only Write Disable Device Check Reset Device Check Error Control Power Device Check Lamp Error Circuits Bus Cable in Signals Bus Cable in Signals AC Power 9 14 30 30 VDC Logic Page Number 0420 0430 0440 0450 0460 0470 480 490 500 510 520 530 540 550 560 570
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30. SILICA S SLT9 S 1104 S SLIOA S QNNOXS 0990 QNNOYS 0790 ON0089 0 90 040049 0990 1 S 0990 SLIOA S 0990 110 S 0990 S110 S 0990 QN0089 0990 041039 0790 041089 090 ANNOYS 0990 1 0 S 0990 S1104 S 0990 S104 S 0990 1704 S 0990 002 6 35V801S ISIC APPENDIX DISC CONTROLLER SECTION 1 1 1 2 A2 1 A2 2 A2 3 A2 4 SECTION 3 SECTION 4 INTRODUCTION APPENDIX A TABLE OF CONTENTS General Description e e lt s e o s INSTALLATION Installation Disc Controller Interconnection Disc Controller Interconnection Interface Requirements FUNCTIONAL DESCRIPTION General Block Diagram Interconnection Diagram REFERENCE DATA LIST OF System 610 System 730 ILLUSTRATIONS Disc Controller Block Diagram Disc System Interconnection 610 Disc System Interconnection 730 Adapter Block Diagram Formatter Block Diagram Interconnection Diagram Page 1 1 A2 1 A2 1 A2 1 A2 1 A3 1 A3 1 A3 4 Page 1 1 A2 2 A2 3 A3 2 A3 3 A3 4 A iii 1 INTRODUCTION 1 1 GENERAL DESCRIPTION The Disc Controller consists of five cards located in the Central Processor Unit Cabinet These provide the CPU with the means of controlling the power sequencing head positioning data handling error corrections and diagnostics aids for the Disc Storage Unit Figure 1 illustr
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43. cleaned in place by following the head cleaning procedure given in paragraph 3 8 7 After inspection is complete return the heads to the fully retracted position and reinstall the transparent air shroud 3 8 2 SPINDLE GROUNDING BRUSH AND BELT CHECK The spindle grounding brush provides a ground for static discharge of the disc pack and spindle l 3 28 Remove the front black door on the front of the Disc Drive so that the bottom access cover can be reached Remove the bottom access cover Check the resistance between the spindle contact arm Figure 3 13 and the spindle Resistance must be less than one half ohm If the resistance is too high replace the grounding brush refer to para graph 4 2 18 SPEED TRANSDUCER TRANSDUCER LOCK NUT TRANSDUCER CONNECTOR xeu DRIVE MOTOR DRIVE MOTOR PULLEY SPINDLE ASSEMBLY BRUSH CONTACT ARM DRIVE BELT BELT TENSIONING SPRING Figure 3 13 Spindle Drive Component Checks 4 Inspect the spindle drive belt Figure 3 13 for fraying or other damage If damage or belt stretch is apparent replace the drive belt refer to paragraph 4 2 6 5 Replace the bottom access cover and return the Disc Drive to its normal position 3 8 3 POWER SUPPLY CHECKOUT Using a digital voltmeter check the power supply voltages at power supply printed circuit board connector 410 as indicated in Table 3 5 PWR ON OFF switch must be turned ON See Figure 3 14 f
44. program for the disc drive With the exception of the read write heads clean ing operations are normally limited to the use of lint free cloths dampened with a solution of 91 percent isopropyl alcohol The disc pack and the mechan ical assemblies are cleaned with this solution and then wiped dry with the lint free cloth The exterior panels of the drive and the disc access cover may be cleaned with a soft detergent wiped with a damp cloth and then wiped CAUTION Do not use abrasive cleaners and chemical cleaning agents that contain acetone toluene xylene or benzene These cleaners may cause equipment damage that requires major repair dry 3 26 Table 3 3 gives the monthly periodic maintenance procedures while Table 3 4 gives the semi annual procedures TABLE 3 3 MONTHLY PREVENTIVE SCHEDULE External cabinet surfaces Clean Use soft cloth and commercial soft detergent Disc packs Inspect Inspect packs clean only if visible contamination is present or if read errors have been observed Read write heads check Inspect Refer to paragraph 3 8 1 Power Supply Test Refer to paragraph 3 8 3 Air shroud Clean Refer to paragraph 3 8 4 Spindle surface Inspect Refer to paragraph 3 8 5 clean and lubricate Spindle grounding brush Check Refer to paragraph 3 8 2 resistance Intake air filter Clean Refer to paragraph 3 8 6 TABLE 3 4 SEMI ANNUAL PREVENTIVE MAINTENANCE SCHEDULE Proce
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46. 1 clear a DEVICE CHECK set the START STOP switch to STOP Wait for the green File Ready indicator to stop flashing and then set START STOP switch to START 2 The following Device Check conditions are reset using a Device Check Reset command from the controller firmware a Setting a cylinder address while not ready b Setting an offset while the drive is not ready Writing while drive is not ready d Writing when more than 80 microinches off track center e Writing when READ ONLY switch is active f Writing while offset is active write transitions for 25 microseconds while writing h Write current is unsafe 1 head or more than one head is selected during reading or writing heads unsafe The Device Check Reset command resets the head address register to Zero 3 The following Device Check conditions can be reset using Rezero command SEEK INCOMPLETE b Receiving an illegal cylinder address greater than 814 Offset active and SETCYLTAG The Rezero command resets the head address register to zero and resets offset 4 Possible hardware problems are a Power Supply b Cabling If the Device Check Indicator lights up immediately after power up the problem is probably the power supply 2 7 INTERCONNECTION A typical interconnection diagram is illustrated in Figure 2 6 for the 610 730 Data Processing System 2 8 a T h _
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50. 2 2 WARNING Ac power is still present at Ac Input Control Assembly when the PWR ON OFF switch is OFF and poses a shock hazard if the terminal board cover is removed 2 6 INTERFACE DEGATE SW PWR 0N 0FF Sw Figure 2 5 Location of Maintenance Switches TABLE 2 2 MAINTENANCE SWITCHES Switch Function PWR ON OFF Switch A two position toggle switch that controls ac power to the disc drive s dc power supply This switch is set to OFF before removing any circuit board or when replacing disc drive assemblies or components INTERFACE DEGATE Switch A two position toggle switch located on the top edge of the Logic I card The switch is accessible only when the rear cover is off The INTERFACE position enables normal online oper ation permitting the disc drive to be selected by the controller The DEGATE position disconnects the disc drive from the controller and enables T2000A Exerciser inputs for offline maintenance operation of the drive 2 6 OPERATING PROCEDURES AND ADJUSTMENTS Operating procedures for installing a disc pack are given in paragraph 2 4 1 The functions of the controls and indicators are given in paragraph 2 5 Besides changing disc packs the only other operating procedures is clearing a Device Check This occurs when the red DEVICE CHECK indicator comes on indicating a malfunction has occurred Due to the DEVICE CHECK condition use one of the four following methods to clear the DEVICE CHECK 2 7
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53. 580 590 600 610 620 630 640 5 3 Sequence Relay Assy Read Write Limiter Logic I Logic II Data Separtor Logic III Servo Control Servo Pre Amp Read Write Matrix Servo Drive Amp amp Retract 5 4 Description Drive Blower Motor Relays Spindle Alert 5 18 18 VDC 5 12 24 VDC Ground amp DC Voltages on PCBAs Location Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 Under Card Cage To Right Side of Head Assy Power Supply Logic Page Number 650 660 670 680 1041402 OAU3S LINA 39 301 3SIQ 0002 I 69EZNZ ST 0290 0090 0680 0620 0720 0220 0120 0810 0800 0900 0900 0500 NO U3M0d 30 NoNd lt 62V 2015 AY130 d30v01 SQV3H 0200 0900 3S10d 42012 NMOG W3MOd 750035 ZHY SUE 31008 zeg 0351 ION CT ONDES 5 4 32012 ZH 9 2 0200 829 0550 JON lt 0900 35714 3201 NMOG 33M0d 250045 SSDS Nd 0010 ZHY SO I 0200 y 0200 35114 2012 ZH 071 ar 0620 asana 2070 ZHY g oz ZPN 1 SDONTNS 0200 35714 2012 ZH 92 0200 ANNOYS H1H913 3NO 1V 018 0950 33013 Av130 3001 m ZH3908 2012 A130 130001 50 3 128 0800 0 00 35104 ZHA 9 21 So 123 A UY 3 N3003S IAIYO 0210 15 NI S310004 0650 035019 011 0500 ET Ty dN Y3NOd 31VILINI 0600 6 391104 20 MO 0650 0900 10WW138 SOV3H 31VILINI O 35 2 50
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55. Area Cleaning and Lubricating the Spindle Cleaning the Intake Air Filter Cleaning the Read Write Head CHAPTER 4 REMOVAL REPLACEMENT PROCEDURES spare Parts List lt s lt lt lt e e e e e Removal Replacement Procedures Replacing the Absolute Air Filter Air Shroud Assembly Removal Card Cage Removal and Replacement Carriage and Way Assembly Replacement Cover Gasket Replacement e e e o Drive Belt Replacement e s eo Heads Extended Microswitch Replacement Linear Motor Replacement Off Rack Microswitch Replacement Relay Assembly Replacement Power Supply Removal Replacement Read Write Head Removal Replacement Servo Head Installation Spindle Lock Assembly Replacement Spindle Drive Motor Replacement Spindle Assembly Replacement e Velocity Transducer Replacement T T T T T T T T tN BO B2 NNN NNN NNN NN N N xO GN G NOU FW N O CHAPTER 5 REFERENCE DATA APPENDIX A DISC CONTROLLER iv Page UI I NO OO lt ON Co Co Wr IM I 4 12 4 15 4 16 4 17 4 17 4 20 LIST ILLUSTRATIONS Figure Locations of Major Components lt o Voltage Select Terminal Board TB2 Dc Volt
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58. TMENT DISTANCE FROM THIS TIP OF ACTUATOR MOUNTING AND ADJUSTMENT SCREWS Figure 3 10 Spindle Lock Assembly Adjust the spindle lock level mounting bracket for 7 100 0 010 inches from the centerline of the spindle to the tip of the actuating button closest to spindle center Tighten both screws to 100 inch ounces Install a disc pack and cover on the spindle and observe that the spindle locks with a pack cover on Remove the pack cover and observe that the spindle is free to rotate Remove the disc pack and install the maintenance plate 3 23 3 7 6 SPEED TRANSDUCER CHECKOUT AND ADJUSTMENT The Speed Transducer is a magnetic pickup coil located adjacent to the spindle pulley that generates one speed pulse per revolution of the spindle The pick up is from a carbon steel pin embedded in the spindle pulley over which the transducer is aligned Transducer adjustment is usually necessary only if there has been shipping dmage or if the transducer has been replaced 3 24 Set the PWR ON OFF switch to OFF Extend the disc drive Remove the bottom maintenance access cover Rotate the spindle pulley manually and check for noises that would indicate that the transducer is rubbing against the spindle pulley If the transducer is rubbing go directly to step 5 Using nonmagnetic shim material as a feeler gauge check the gap between the transducer and the carbon steel pin in the spindle pulley It should be 0 006 0 001
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60. adjusted properly will maintain the lid in any position from half open to fully open To adjust spring tension proceed as follows l 2 Remove the air shroud assembly refer to paragraph 4 2 2 Put the lid in its half open position and tighten or loosen the self locking nut on the underside of the right hand spring keeper Lower the lid then raise it to the half open position The lid should remain in this position if not repeat step 2 3 21 3 7 4 LID CLOSED MICROSWITCH CHECKOUT AND ADJUSTMENT The lid closed microswitch is located beneath the air shroud and is actuated by a pin on the underside of the cover lid when the lid is closed If the switch is suspected of faulty operation or misadjustment proceed as follows 1 Unplug connector P J30 2 Measure contact resistances of the microswitch at connector 130 by using an ohmmeter See Figure 3 With cover open Between pins 4 and 5 should be Between pins 5 and 8 should be With cover closed and latched Between pins 4 and 5 should be Between pins 5 and 8 should be 9 for connector pin locations shorted open open shorted Figure 3 9 Connector J30 Pin Locations 3 22 3 7 5 SPINDLE LOCK ASSEMBLY ADJUSTMENT Set the PWR ON OFF switch to OFF Remove the maintenance access plate inside the air shroud four slotted screws Loosen both screws Figure 3 10 that secure the spindle lock to the base plate MEASURE ADJUS
61. condition and causes a re verse seek operation that repositions the heads over cylinder 000 and resets the head address to 0 It also resets the cylinder address to 000 and resets the error condition that made rezeroing necessary The rezero seek operation is initiated at the trailing edge of the Control Tag line signal after activating it with Rezero Bus bit 8 set Servo control is switched to reverse drive load speed velocity is activated and track follow ing is disabled causing the linear motor to move the heads toward the outer periphery of the disc at load speed The heads continue their motion out of the recording zone through the outer guard band and into the head load zone of the disc pack As soon as the servo head signal is lost servo control is switched to forward mode reversing the head drive direction As the heads move inward still at load speed the servo head begins to pick up a signal again from the outer guard band Servo control is then switched from load speed to track following and the heads continue to move forward under control of the position error voltage derived from the asymmetrical servo signal picked up in the outer guard 3 8 band The servo locks in on the first dibit signal which occurs over cylinder 000 stopping the heads on that cylinder with servo control in the track fol lowing mode After the rezero operation is completed the Disc Drive ready signal is raised 3 4 7 HEAD RETRACT OPE
62. inch as indicated in Figure 3 11 Also check that the end of the transducer coil is aligned with the pin TRANSDUCER 0 004 0 001 PIN PULLEY Figure 3 11 Speed Transducer Gap Limits To adjust the gap between the transducer and the spindle loosen the locknut on the bracket end of the transducer turn the threaded trans ducer to move the transducer toward or away from the spindle until it lightly contact a feeler gauge of 0 006 inch thick nonmagnetic shim stock and tighten the locknut Check output at connector backplane pin 6B 13 If a minimum of 5 0 volts cannot be attained with this new adjustment replace the transducer Replace the bottom access cover and return the unit to its normal position 3 7 7 MOTOR ALIGNMENT The motor bobbin inside the linear motor is attached to the T block and held in alignment by four screws Figure 3 12 Bobbin alignment should not be neces sary unless there has been shipping damage or the linear motor has been replaced To align the bobbin proceed as follows CONDUCTOR BANDS OHMMETER PLUS OHMMETER MINUS Figure 3 12 Bobbin Mounting Screw Location Set the PWR ON OFF switch to OFF Remove the rear cover and the transparent air shroud Swing out the logic card cage and power supply assemblies Make sure the carriage is fully retracted and loosen the four bobbin retaining screws just enough so that the bobbin can be moved with the fingers
63. stop Retract the heads manually and remove the tissue pads as the heads are cammed apart Inspect the heads for contamination and reinstall the maintenance access cover 4 2 10 RELAY ASSEMBLY REPLACEMENT The Sequency Relay Assembly is located between the blower and the spindle drive motor service It is hinged to the frame assembly so that it can be swung out for See Figure 4 2 for locations of major component parts To remove and reinstall the relay assembly as a unit proceed as follows 1 2 Set the PWR ON OFF switch to OF and disconnect the power cable from the source Remove the front cover 5 4 2 11 START CAP DRIVE BRAKE AC DRIVE SSSW K3 RELAY 1 SSSW K2 ONNECTORS P20 CONNECTORS EO AND 132 B21 AND P22 Figure 4 2 Sequence Relay Assembly Component Locations Swing the relay assembly out to its service position and disconnect connectors P20 P21 P22 P23 and J32 Clip any ties that attach the cables to the relay assembly Swing the relay assembly in but not fully Using a flathead screw driver spring the left hand hinge from its pivot pin and remove the relay assembly To install the replacement relay assembly reverse this procedure POWER SUPPLY REMOVAL REPLACEMENT If power supply voltage checks given in paragraph 3 8 3 indicate that outputs are out of tolerance the power supply must be removed for replacement To remove and replace the power supply proc
64. times are measured from drive ready to drive ready 3 4 5 TRACK FOLLOWING OPERATION Switching the head positioning servo system to the track following mode detent on track after first seek programmed seek to cylinder or rezero places the servo system uder control of the dibit signal picked up by the servo head As long as the dibit signal is symmetrical indicating that the servo head is ex actly centered between two adjacent recording zone servo tracks the integrated position error voltage will be null or zero volt Any asymmetry in the dibit signal indicates that the servo head has drifted off track and has produced an increasingly positive or negative position signal that is applied as a correction voltage to the linear motor to move the servo head back to the null point of dibit symmetry The position signal can swing positive or negative by as much as 2 volts if the servo head completely loses the signal from one of the adjacent plus or minus tracks Also notice that the direction of correction forward or reverse to bring the servo head back on track relative to the polarity of the position error voltage depends upon whether the servo head is tracking an odd or even numbered cylinder The least significant bit of the cylinder address is used as an odd or even indicator to ensure that error correction drive is always to ward the position error null point of track center An upper threshold detector is activated wh
65. 0 TEV ait 333H2 301 30 13S 0090 AL 9d 0290 t 9d Qv3y NO 03123130 SS3800V lt t 9d 3137dNO2NI 335 st lt 9d 50115 3NITNO 3AIUQ lt NOILIONOJ 323H2 321430 lt 5111 LYT ATNO QV38 lt L 9d AQy3u IMA lt AL 9d 35114 X3QNI air AL 9d TVN9IS 135430 AL 9d u3QNITA2 40 ANI 031 6EV SSY 9SY ESV ISV 6 19 Sov V 5218120 35 04 04 vl II 31901 xb TEJ 319930 0210 88 TT EEE 31 930 0210 8 TIO LTU 123130 xuvW SS3uQQv 0650 130 3 FONDS 3131dWOONI 333S 0620 82V 030v01 34V SOV3H 0250 Nd 523H2 321430 0190 H S ATNO QV3U NOY 211 0650 31IMM YO 0938 OL AOV34 0620 03 018 gt 3S1Nd X3QNI 0610 135110 135330 034939033 0 10 1 voy Dis 237135 3 10 020 503 YAONTTAD 40 0910 0402 1 LINN 3900015 3SIQ 0590 1 901235 34150909 lt t 9d 535104 801245 Lev L 9d 5357104 t 9d NOILNSLLY kk L 9d LOSI 9 11 N311VI 9v8 058 0319930 LON ONY 03123135 T 258 013S1 001 TY II 91901 S vOv c 0 01 9615120 3t 001 9 99 lt oor 2 e 9 ul e nt lt e RE gt wo m 2 Q w SS 0t4 O z gy i 09 0 5216126 a 3L val s N OL 0094
66. 0 ATAWISSY 1041409 LAdNI JV SLIOA OpZ O Z HO ZI 0990 SLIOA 022 802 30 SIT 0490 SLIOA 002 061 30 001 0 90 V 3SVHd 0690 OhO NI 393015 2510 A 18N3SSV Av 3H 32N3n03S 0890 S3AINQ AO0b2 OtZ A022 802 AO002 06T NO Quvog W3l4dI d4V 3AINQ NO 03123NNOO 310N 332208 1430Y 310 145 6 6 9000 6 3010 INI AS H t eet TARZAN 820 EER I eet 30108 B30 18 AJIWISSY AV3 30N3N03S ILO 82 9 En P t 02C ET 9C COE TE Co ee lt e a 9 MI 2 1 00 6 97 TY 2 02 6 11 9 CD z 9 027 C bys ys gt 51 97 pag 6 12 8 12t LINN 39vu0iS ISIC 002 1 1831V 37109195 0600 3181 37194343 S110A 08 39 1 0 9NI3AV88 20 Av134 Di 3ZI983N3 OVIul ZA 32194343 Av138 bX 371903N3 S110A 0 S104 022 802 30 STI V 3SVHd 0190 0790 090 0900 0900 0900 0790 0790 0990 SLIOA 092 082 30 21 0990 0090 S170 05 0351 LON psa 9598 gt SL 10A 05 Op90 Oct 0890 0 90 110 S 338 A OA 12 A EZL ANI JIT 30411933 JOVL TOA 93 2S8 QuvOS III 21901 s 8c OOO eee NYNLIY IGA 6 OF90 8t 1133 OQA OE 0 90 1 0 6 0v90 0 90 SLIOA 81 SLIOA 0 090 0890 SLIOA 8I SLTOA OE 090 0490 5110 8I 0890 S110A 8I 185 SISSVH3
67. 00 03 T 80 Head R W 02 T 80 Head Servo PCBA Read Write Matrix PCB Data Separator 80 PCBA Read Limiter PCB Logic III N S PCB Logic I 2530 35MB PCB Terinator Filter Absolute Item No 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TABLE 4 1 MM Number 248020 249010 249021 249030 249040 249050 249060 249070 249080 249090 249100 249110 249130 249140 249150 249190 Manufacturer Part Number 12560 001 12427 001 17209 001A 97769 001 TS 100 UTICA 97722 001 13445 001 13484 001 13484 001 99129 001 12541 001 96803 001 10S 6 PU 13378 001 TAN BH 3 32 REPLACEMENT PARTS FOR DISC DRIVE Part Description Filter Preliminary Extender PCB Head Positioning Tool 0 5 Head Positioning Tool N S Torque Wrench Head Mount Pin Safety Tach Rod Insert Remo Tool Tool Way Roll Adjust Tool Carriage amp Way Align Wrench Way Screw T80 CE Pack Read Camming Tool Way Torque Driver Head Wright Set Shim 004 001 NON MAG Hex Key Ball 3 32 4 2 REMOVAL REPLACEMENT PROCEDURES 4 2 1 REPLACING THE ABSOLUTE AIR FILTER The absolute air filter inside the disc drive should be replaced every six months of normal use or more often in extreme environments To replace this filter proceed as follows l 2e Set the PWR ON OFF switch to OFF and remove the front and rear covers from the unit Open the pack area lid remove the disc pa
68. 0502 I LINN 3959015 2510 0 00 III 31901 LINN 394015 2814 0506 MII 13538 0800 NMOO e NOUOdN Ott att 9 ZHY 9 21 0200 vott of S 912044 86 9 321 31V9 NMOG 03345 1713 30 198 0800 045114 LAO 0311 331410 0800 A 9d 0334 OL df 3104145 228 SV gt NO 43MOd 20 0100 033453 OT TI A3N300334 98 gt ans HLH913 3NO iV Old 090 0 00 03345 01 3T0NIdS E TERIS 335408 2096 001 88 383900X138 0800 0t00 01045 0200 334 OL 37 NIdS EET or el 135394 02 923 c 13 33 0800 x 0 00 13 33 1353 et 86 jEr 9 TT rds 357109 ZHN 9 21 0200 A7 vlot 38 38 b q c b q z amm NMOQ 30 0400 13 33 135394 O OT v 21 1 XT 844 aM 1Nh02 35 39 A vt AS u Mt 0400 033dS 1103 30 258 1103 03908 III 21901 0800 3 3 lt 18 9 I8 33500X 138 Ag 03908 1041403 OA33S 43910 31 1 0800 QuVOS 1091409 0133 LINA 35401 2510 0600 0308 III 21901 110132559015 ISIC onoz CI 15012 035012 411 0500 7041409 YOLOW 0900 ev 0590 143719 3100145 Iwa S MAT A s u 8v Leu 1 e 32 AS SLIOA O 0990 HAOOLZ 002 21 tt 6 9 5 9 O 009 321d2V NMOGLNNOD 23S 61 0909 ot 6 VN31N2 Q OLOW JAIXO JTGNIdS 0900 EDD 35119
69. 1 0 80 0450 040 0250 0850 3803A YIINASNYYL ALI2013A u39nasNvul ALI2073A W3ongsNvVul ALLOA W3onaSNvul 411207134 8031 10 TA 117 016 64 AQE dW2 13A YOLOW ELS 31 Ly UII4TTdHY 3AINQ LINN 39 401 ISIC 00 S110A 0 0190 1433 IGA O 0190 T O 12 3 4704 O 0190 S100 0 9 s 3S 0850 L 0Tf gt IMYA 942 MONATA 5 682 08 0 9 0IC Fae 3AI80 OAN3S 8900 0 v2 S110A 0 0190 7 u343 00 0 q Ol aa 1948134 ANID 3491 19 4133 AON3983W3 NI NMOHS D AVI3d 1944138 AON3983M3 03908 u3I4IdWV JAIXO 0690 01 NSIS ya v rArO S SIT p00 0 Eo 63 ALEZ 6v 152 E 060 21D 01 TVN9IS Yl aq 511 00 0 osy 82 090 03193135 QV3H ILINW lt ETXI kak e a ARR UR TRECE me 2 p UO T Y0H 2 y 2139 eu 0H A EB zs zx cx DS 839 XOT HER 20H TUE NECI S Sud ory IUD T1 20H 7649 632 m IGH n ES el 4300230 5533009 QV3H Abb T TQH I QV3H 00H 2 00H F 0 QV3H XIYLWW M 3 3 1 gt 61 10 11 10 n 81 10 TYVH 2UVH 31INM 0810 ONY 8I 090 820 09 0 1 938 5 4 QV3H 0910 938 SS3800V OV3H 0910 103135 QV3H 08
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72. 315 10 OO v 505542094 1 5 fime ADA pm 4x nem e ume Mast Pene vi WC 991412529 1410 925 uonecg aa nos 3 saq se194 UYbIVE Wd 348 931131 AM ASV 5NIONOdS 3 YO pu 22 a 0 0 5 HIN f acn wen gt 90 yan xen xon 22 Er Era pref pua 9 2 lt gt a oe en gt ors sas i 25 Id 22 E 419 E c 2e E ESE Du Psy DH i 612 Q 2 A4 13 Reference Only Will Not Be Maintained ALVSBIId FALLY MAOI 91903 90806 PAJUTI urquy 199215 Ppr YINCS SELL 931212345 5 10 SSAINN h uone 2djo23 JnOs 3seQ S3HINI NI JYV SNOISNI NWO ONY AS A4 14 Reference Only Will Not Be Maintained a01 i SONY 0 0 XXX CO vex Q3141234S 351MU3H10 S31NN 32Nv83101 0826 unpueuw 18S unos SEEL 56 WUONeJOGJOA 15 3HONI NI SNOISN3WIQO AINA 30T1038141N0 2902324 povin SOVN 9OvVN LOVIN OSNN IONN E OVN IOOF Co ray A Ip 2d vi 22 27 221 ZYW le 41229 75 sra v vi 92 peed x og 572 aswa e dica ELI s emus 17 24 21 24 LN VN 23 gr 2d EE 23 bE gr 2d D s 5 ss ee er zs ee Oo fe Se J09 271
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74. 5 310 52310 STAI ae 2410 tY 5310 LINN 3909015 ISIC 006 NI 33110 0 20 2 4314109 0 20 T Y3LNNOD 0 20 ZIS LNdNI VIVO 0920 9S2 LNdNI VIVO 0920 LNdNI VIVO 0920 9 INdNI yiya 0920 INdNI ylva 0520 9I INdNI VIVO 0520 lfdNI 9190 0520 1 dNI Wivd 0620 LAdNI viva 0640 INndNI 9490 0620 mn 32012 u31Nh02 39438343190 0980 3408 9NIMO1103 AIVA 0820 3004 0707 NI 1 02 3943833310 0810 OLEO 39V170A 3 43 33 39 803 0820 8S8tN2 Ib H21IMS 113 104 8 lt L AL T 0 T 92 e 302 L sty I AL S AGL Lu ST 839 302 8645 9rd A6 tI I yore 1 T Su Cty vty O13 38 4 TIU AS AS 2182 3S II peu TIXI 0132 612 399 8 zz 2 7 E 329I vt vu 6 LZ 681y 1595 e 2H 302 la 1 0 072 AS TOULNOD OAU3S 81V 61v Lv 6v 8v 9v SV LY Ov ov TY gt quvMuOJ OA33S 3J18VN3 0 10 MiAUS SVIG 2 1501 2 13S440 SVI8 110A I 0850 03345 0907 0120 135440 Q3WWvu90Hd 0 10 ZIS 431N002 32N3HU343IQ 0220 2195410 gt 992 YJLNN09 329N3434410 0 20 9S243I0 N 801 821410 gt 9 LN 941 0 gt ZE e 4IQ 02 39 3334319 0420 05 3oN34344IQ 0 20 09 393333319 0420 gt 9i 43110 39
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76. 73 S gt 33 03559 Lt 03593 019155 4 F gt 0191 3 Q121574 Sp G0121S99 13S6 p 13 3 135 4 13593 Ub gt Ot eg SE wevLvd LE 38112 9 WEN 02 WI31 SE QN9 dD pe QN9 V 791493 ar WIvivd diV1v 1135 1035 019151 NllVIq S N23 ONIGNVLSLNO 19 40712 WOY LYG dOYLYG 014S 003S 0151508 NL1VON ASL 91 01 S319NV 010 0 i XX vix 03131034S 3SIMH3H10 37 S33NVH3101 aNd CE 359154 I lt 13S 0 8035 C2 01915 9 S2 NllVE Le 2 Sz pe ec r2 02 Gi eg LA 9 W219 SI 42119 324140 21 2135 E Zd3S 0191523 6 NliV2u 9 L ej S gt ASL 91 aNd I aNd V Wavy 99 QN5 A v AN9 yonsa E INS 7 and vivaun 19 QN9 1n08N3 09 QN5 T1shgIQ4 GS OSNAIGW ESNGION 95 250910 550910 vsnaraw LSNJIOW 9S 951810 9 19 SS 035 9 01S ps Zosna 31 909 ES 31 91 1S IS 0S ev 03573 33 03594 Lw 03 93 0191553 9v 01015 01975 4 St 0121S9 13SSY 13Stu 135 3 lt 13 94 2 iv 0t GE Se ano LE QN9 otc 6412 S QN9 35419 pE QN9 8 V dX3 TWIOVY Tf A4 2 031512395 3SIMB3H LO SSI 1NN S3LON KINO 9zSOG NO WsVlv aNd 38910 zE 5135 IE gd3S 0 0191558 62 WZATI Niivsd dM 2 924190 Se 17135 v2 L03S
77. 75 millivolts peak to peak 2 3 3 DC POWER SUPPLY DIFFERENCES Disc drives may be shipped with one of two power ranges to match the single phase AC power available Figure 2 3 is a simplified illustration of the two power ranges PWR XFMR A 190 240 VOLT DRIVE CONFIGURATION TO BLOWER AND MOTOR RELAY 9A J P13 TO BRUSH MOTOR RELAY FILTER PRIMARY POWER LINES GND 07 230 N 240 TO MOTOR RELAY TO BLOWER PWR XFMR RED B 100 127 VOLT DRIVE CONFIGURATION TO BLOWER AND MOTOR RELAY 6A TO BRUSH MOTOR RELAY J P13 30V RFI FILTER Ia I PRIMARY POWER LINES 98 NTL L 30 VAC GND NOTES gt FUSES F1 AND F 2 ARE PRESENT ON DRIVES WIRED FOR LINE TO LINE POWER CONNECTION FUSE F21S DELETED ON DRIVES WIRED FOR LINE TO NEUTRAL CONNECTION TO MOTOR RELAY gt LINE JUMPER CONNECTED TO T82 3 4 OR 5 TO MATCH PRIMARY LINE VOLTAGE TO BLOWER Figure 2 3 AC Power Distribution Simplified 2 4 2 4 SYSTEM INITIALIZATION Verify the controller cables are connected to the formatter chassis Radial Cable at JO4 BUS IN at JO3 BUS OUT at JO2 Ensure the shorting jumper referred to in paragraph 2 3 1 step 4 has been moved to the OPEN position for system operation 2 4 1 LOADING AND UNLOADING DISC PACK To install a disc pack on a disc drive perform the following procedures
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82. ASS DIAGNOSTICS It is recommended that the BASS diagnostics listed in Table 3 2 be run at the time of installing and repair to verify proper operation of the Disc Drive For operating BASS refer to BASIC ALL PURPOSE SERVICE SYSTEM BASS MANUAL by BFIS manual DM1102 TABLE 3 2 RECOMMENDED BASS DIAGNOSTICS Long Short Disc Seek Test For burn in verification of head seek functioning and head alignment Disc Scan Restore For error isolation or correc tion of marginally bad sectors or to check alignment Disc DMA Write Verification For burn in verification of disc and DMA functioning Direct File Disc Exerciser For exhaustive burn in verifi cation of disc and DMA functioning 3 6 ADJUSTMENT PROCEDURES The logic card age houses all the electronics on six plug in circuit cards with the exception of circuits on the Read Write Matrix and Servo Preamp cards Figure 3 2 shows the correct locations for the plug in circuit cards as viewed from the Card locations are identified by slot numbers one thru six 3 6 1 HEAD ALIGNMENT PROCEDURE USING VDT BOOT LOADER Perform l the following steps Load Alignment Pack and set disck drive Read Write switch to READ ONLY NOTE The Alignment Pack requires 30 minutes of running time for temperature stabilization Set SENSE switches 1 and 4 on to the left Press the LOAD switch on the CPU panel Set terminal O the half duplex mode 1 SLOT NOS 100 9
83. Basic Four Model 2500 Fixed Disc Drive BFISD 8006 Service Manual Basic Four Information Systems AD The drives seems to be from Century Data at least one drive i have is a 80 Trident Documentation for these drives is available on Bitsavers The information contained herein is proprietary to and considered a trade secret of Management Assistance Inc All rights reserved No part of this publication may be reproduced recorded or stored in a retrieval system or transmitted in any form or by any means whether electronic mechanical photographic or otherwise without prior written permission of the Basic Four Information Systems Division of Management Assistance Inc All Rights Reserved BFISD 8006 Copyright 1979 by Basic Four Corporation All specifications are subject to change without notice Basic Four and MAI are registered trademarks of Management Assistance Inc Printed in the United States of America Basic Four Information Systems Division Management Assistance Inc 14101 Myford Road Tustin California 92680 714 731 5100 TABLE CONTENTS Page CHAPTER 1 INTRODUCTION 1 General Description e e s o e e e e e e e 2 PUPpOSQ lt lt ce UE eno 3 w w 3 Physical Description e e s lt s s e l 4 Specifications e lt lt s e e e e e e e e e e e e ool CHAPTER 2 INSTALLATION Unpacking Packing Procedure
84. Cut four 3 4 inch wide shims from filing card or punch card stock These should be at least four inches long Placed folded Kimwipe tissue pads at least four thicknesses between opposing heads to cushion the head pads and move the heads out slowly so that they come together gently and just clear the camming tower Place the four paper shims between the bobbin and the linear motor housing lengthwise space them evenly around the bobbin 3 25 Make sure that the shims protrude far enough beyond the T block end of the bobbin that they can be pulled out after alignment is complete Otherwise removal of the entire linear motor may be necessary to retrieve them 8 Move the heads back to the retracted position make sure that the shims are clearly in sight 9 Tighten and torque the four bobbin retaining screws to 100 inch ounces 10 Remove the four paper shims ll Replace the Kimwipe tissue pads between the heads let them come together gently and check for any indication of bobbin drag over the full distance of carriage travel 12 Move the heads back to the retracted position remove the pads as the heads cam apart Inspect the heads for lint and clean them in place if necessary 13 Close and secure the logic card cage and power supply assemblies reinstall the transparent air shroud and rear cover 3 8 CLEANING AND PREVENTIVE MAINTENANCE Cleanliness is probably the single most important element in the maintenance
85. ECTION DIAGRAM Figure A 6 illustrates the interconnections with cable part numbers TERMINATOR DISC CABINET BACKPLANE FOR EXERCISER P N 902017 DISC TO OISC BACKPLANE DISC CASINET P N 902016 P N 902015 P N 902015 RADIAL RADIAL FORMATTER 1 0 PANEL CPU A3 4 Figure A 6 Interconnection Diagram 4 REFERENCE DATA Title LD Formatter Backplane Pin List PCB Assy Formatter Radial LD Formatter Radial PCB Assy Formatter Processer LD Formatter Processor PCB Assy Formatter Bus LD Formatter Bus PCB Assy Adapter Bus LD Adapter Bus PCB Assy High Speed DMA LD High Speed DMA Drawing Number 902042 901930 901932 901960 901962 901920 901922 901970 901972 901980 901982 Page A4 2 A4 4 A4 5 A4 6 A4 7 A4 12 A4 13 A4 14 A4 27 A4 28 A4 29 A4 41 A4 42 4 43 A4 53 4 54 4 55 44 66 A4 un hid 1 i 260206 ON 3NV1d32vg 4311303 21901 0826 ujue2 wiayeuy 3924 euipnej NOS SEEL a uoneJodJo2 jno3 a3iseqQ 99 INS po aNd 201250 E9 and vivaad 29 aNd VIVOUM 19 and LNOGNa 09 QN9 TsnaSldq 6S OsSngIdW ESNJION ZSNJIOW SSNIIAN tS YSNJIOW LSNJIAN 55 95 810 9 19 SS daS LY 015 bs L0Sh8 31 909 S 31V91uM 01975 5 61S 135 0 IS ISUSAS TSNSOGN 06 OSNSOGW sng004 Gt eSNaoaw 035
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87. I TI AS T f H oT vi t sl o 005 6 T 8 26 01 oost TA 5 zT 005 S 0159 29 LINA 3909015 ISIA Ole ajo 0002 TI 21 98 0540 28 0590 1 08 05 0 128 0 NOSION3Y Sd 3x 13M3 5 ors ET Ere gt 31930 0210 ZA Z 31198 3LIYM OESO 1 STET 53800 ILIYM OESO 6 8 0 60 9 E t 8 84 Obv0 S 8 29 Otto 6 2 d ud 6 84 00 2v I L Ve 080 zi 8 8 0250 N S 2n 0351 10 0 lt 03S6 LON I 035 LON 6 29 0O 6 84 00 1 91 00 6 89 Otto eee 5 99 00 1 25 050 8 0 50 0980 0670 31V9 31IUM ut d t sz i L9UM I LuM 005 4 EL 2 60 O by 219 1 VIVO LUM 9d SNOILISNVHI 3413 lt EZ IC 141 wo L 005 OT t AS ov L9UM 0580 31dWVS YN 6 10 SUMI 3I 6 pry 248 4 lt 9481 93 Leu 0250 0139 QNV 2dl 0290 OED ONY 91 Ll aes ege ch d Oty 296 6214 ory eeu OTT Sa gt vey 1 XOT 8 6 I 1b eeu 1 gt gt Tey 2E xot 01 TI 99290 063 32 624 853 L2 10 301 8618 Lea gt caren Abe Avet 3LTYM avay 311M 0810 aNnous VIVO 3118M 0590 31V9 31INM 0690 11415 3118 0810 0351 LON 0351 LON 821 SS3900V 142 010 3185103 14 065 oroz 1 LINN 39 361 2SIQ LINNA 359615 2510 0 0 40149335 VlVG 0502 O
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90. II CHAPTER 5 REFERENCE DATA Description Power On RETHDS Clocks Start Stop amp Micro Switches Brake Latch Pack On RETHD Kl Drive Motor K2 AC K3 Start Pick Signals Up Down Speed Counter Speed Transducer Speed Counter Ready Spindle Alert Bus 0 7 Bus 8 amp 9 Cyl Control amp Head Address Tag Lines Select Drive Degate Set Cyl LD Car LD Difs Cylinder Address Reg Illegal Address for 80 amp 35 Mbyte Drives End of Cylinder Head Address Reg Offset Offset FWD REV Offset Start Logic Page Number 0010 0020 0030 0040 0050 0060 0070 0080 0090 0100 0110 0120 0130 0140 0150 0160 1070 5 1 Logic Logic Logic Logic Logic Logic Logic Logic Logic Logic Logic Servo Logic Servo Servo Servo Servo Logic Servo Servo Servo Servo Logic Servo Drive I 111 III II II II I I Control II Pre Amp Control Control Control II Control Control Control Control III Control Amp Description Control Tags amp Bus Bits Index Pulse Sector Count Load Speed Seek Enable Set Forward Control Carriage Forward Rezero RETHD lst Seek Track Following Mode Initiate Seek Difference Counter Difference Counter Difference Counter Fwd Rev Voltage RDY Seek Incomplete DIBIT amp From Servo HD Phase Squared DIBITS Position Error Detect Hod UTHP UTHM Difference Counter Clock Heads Loaded Counter
91. IS ALI2013A 00t VN33S INNO 3943333410 318VN3 pY VN313A O 00 318VN3 1335 0 2 0 3 3004 9NIMOT104 3X2V3L votz 00 i 0820 OMNIS 318 N3 IV a2 Sng 2 SEV S g A38 0MJ 135440 28 vl AS 0334 0v01 45 1 JLIYM HO OVI Ol AQV3N totz oor 2 TAAA A 9d 135430 0 de zO g 43151934 13S4303 1 T LEY gt SS3u0qV 135 0290 0190 13 un rm We 2 sng OLIO 135440 OHH Sv 2508 135330 quvo8 II 21901 OTTO 0010 0LTO 0120 0220 0820 0010 0120 0620 0110 0010 0910 318VN3 X30NI 91 112 LON 301A30 gg 00 0 sg 0010 0950 31V1 380915 918 9 x l t I sng 0010 0950 AHYI 380418 O oot Tena I A 1381S v sng 0010 OESO NYY 553800 lt 228 O oor I 9518 089 oes ozs OSE avas ay lt 61 i OL oor fat 6519 sna 0010 Dd QY3Y OWT 95 OL 39 OTT X T 0650 39110 20 MO lt 908 ET 0910 39V110A 20 M01 Tema aci o E 98 3OV110 20 MO 000 095 OES 09 Ozh 118 O LUM al CR90 OPO 3119 lt EZY 2 sng 0010 vOv 2508 A 9d lt 818 1 SIS L SNS ODIO el 0094 ew 060 0290 193135 gek EY zO
92. L i388 elo y Q9s YSF 900 22 91377 D d AWOVAAD RE ow 01571224 Pe ere ES 1 e 2 O nae m v xav3us 220 18 G XS5 0051 A4 32 Reference Only Will Not Be Maintained 401 STONY 010 0 XX vix 031412345 3S MU3H10 SSIINN 32 v893101 a 3iSeq p et 89 NYO MI 2 14 di anga 0YdX 7 v1Q01 31 Ver dI yos ETE T avana 2 EE 33803 G 108113 E73 os SER e gt d wb e e 9 319903 5 MAIL 2 Pd ll t e INAS LUM J n LS 31N91uM THIS otv ld S E mei Cr 15 1199 Be e 905184 LUE i 5 FOYS zous 9 TEAR 7 SERE 0 9 a AALLSULNO O O 8 TNO IOUS al z 1 WU 1 oous zin 7 2 AI ya V VE 533 x a 2 ASt A4 33 Reference Only Will Not Be Maintained 0846 OED urn qeuw 192015 euipnei2 4110 SEL n LuOcueJodgJo3 noa 2isea 02 24 2 UZIET P cd EE VET SINS 8 33XQ I 8 5 QvaNa Stina 8 NIH 2203 Quvavua 31995 10N OQ No assvixw 53073975 OINIKOVN Rd debit SISNI ic ai Snivis 2 rie ee Bee usnisd
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94. MICROSWITCH REPLACEMENT If the heads extended checkout procedure indicates that the microswitch is faulty replace the switch as follows l 2 Disconnect plug P50 from the microswitch Remove the two screws that fasten the switch mounting bracket to the way assembly and remove the microswitch and bracket as a unit 4 7 Install the new microswitchon the mounting bracket by using the original switch mounting hardware Reinstall the microswitch and bracket on the way assembly leave the two bracket screws slightly loose Reconnect plug P50 Position the head carriage 0 060 inch from the fully retracted posi tion adjust the microswitch untl the contacts just transfer and tighten the bracket screws Move the head carraige manually betwee the fully retracted position and the microswitch transfer point The microswitch should transfer within 0 059 and 0 061 inch of ravel If not repeat step 5 Reinstall the maintenance access cover 4 2 8 LINEAR MOTOR REPLACEMENT Linear motor repiacement is necessary usually only if the bobbin is defec tive The linear motor is supplied as a tested assembly that includes the motor housing bobbin front bracket and conductor bands but without velocity tachometer components To replace the linear motor proceed as follows l 2 3 4 8 Set the PWR ON OFF switch to OFF and disconnect the ac power cable from the source Remove the rear cover and the transpar
95. NI S gt 136 2 EZE amp S v 783 K 7 1 4 t e UR ISL 7 pz 2 P a sdqiea 5710569 A foward o 4100209 13534 NZ aam a 130 7 Pra Ad Te aj A 2 apr fr S 2 TOSVvL 2 nd Cc 2 42 lt 25 3 7979700 DLIPL M EB gay gis eis e salsa e AS ers 2 gwisa gu 205 4 mf 2147 v usa S 01 GOu3s e121 5536 9 asas 2 iS 2 pLIbL VANO ETZE Onl 7 DY idj EEA 57775 2 poris 7 _ 51 222 Set id P 41585 lt PERLE 4 viris gt 42 DIE ks z Sad A4 31 Reference Only Will Not Be Maintained c I 226106 oe MEME 90826 1801S quinos SEEI snos aseq Hi GST 4 32v 350 Q3NIM VN x Eu 0 1 319NY 010 XXX XX tx 931312345 35 1 SSIINN 33ny 83701 3HON N SNOISN INIG 3435 isusas x12mu3 S 3weqa 9 0 aug TTR P Ma 5 s SIOR 8 ONASLUM NANI AM ZEXEL S vAvaAva zango 9 5 E ISSA 7 1 3 2 GOISTP
96. O OAN3S 0460 0837 830 1 2 N 01 SOV3H 34015348 022 DAS 13915 2335 0937 3310 0120 VIDI 3004 9NIKO1103 12981 0820 ayol 0120 03345 00 0 8 16 094 gt y 7031402 NIV9 JILWWOLNY 0580 A9 gt gt L100 OSL v2 e too L 12 T x1 S 1 P gt ys ae T zu 5 OTEO LISIQ lt 09d If el W8IO 10 0 6706 ups OH OAU3S Qv3H 613 00 0 335 woo 2 002 91 OTEO 11919 Sa ee Lt0 0 oe 1 QNVOB 7 0335 u3IdI dWV3ud 0143 onoz HHI LINN 39vsclS ISIC 2031403 0 43 AINN 3959015 ISIC 0780 002 T M S S02 AH 0 14 gt 6014 030907 38V SOV3H 0280 0 10H HITS 2I1 OSEO 511910 Q3Nvhbs 9005 015 8819 AS oF 65 gt d 11910 0050 0610 0314I dMY 11910 lt 99 og 019 lt 31176 65 Eum u TITY W 119 181 3 SEY W8IG NI LIOSHY 6v 095 et z 0 511819 03133135 3SVHd az ids vO6ENZ S 7 SVI8 110A I OLEO 91 ani SVIS VEA X207 t SI I 9 934 5533009 142 OPIO 293 5018 L 185 TLOSHY 301 6v poly 4401 431111945 3SVHd 12 Ael 32 302 68 964 1189 0080 1081409 NIV9 JILWWOLNY zk ESY MI Uo m MI 692 X2 2v WETS 983 veu X001 E6 X02 964 0950 0650 OrtO 18 9 01 0610 0600 030Y07 SOV3H exo is 289 583 OSEO OTEO 03QVO1 SQV3H e xu
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98. RATION A head retract operation unloads the heads from the disc pack and retracts them fully from the disc pack area at the start of the power down sequence when the START STOP switch is set to STOP As soon as the power on START switch signal is lost the servo control is enabled to drive the heads in the reverse direc tion at load speed This disables track following and puts the Disc Drive in the not ready condition When the heads move into the head load zone at the outer periphery of the discs the camming surfaces of the head arms make contact with the cam tower this forces the heads away from each other ad away from the disc surfaces The heads continue to move in the retract direction causing the carriage to open the Heads Extended microswitch The microswitch action disables the head positioning servo and permits the power relays for the spindle motor to drop out braking circuit is switched in and applies a 44 volt DC braking voltage to the field winding of the spindle motor for approximately 19 seconds The disc pack should come to a complete stop in this time completing the head re tract and power down sequence operations 3 5 DIAGNOSTIC TESTS Use the following diagnostics that test the control panel and verify proper operation of the idsc drive 3 5 1 INDICATOR TESTING A continuity check of the control panel indicators is recommended before run ning BASS diagnostics 3 5 2 BASIC ALL PURPOSE SERVICE SYSTEM B
99. S AND INDICATORS The control panel contains the following toggle switches and indicators READ ONLY READ WRITE Switch DEVICE CHECK indicator FILE READY indicator START STOP Switch Figure 2 4 The function of the control panel switches and indicators is given in Table 2 1 READ ONLY START eee Le READAVRITE STOP Figure 2 4 Operator Control Panel TABLE 2 1 OPERATING CONTROL PANEL INDICATORS AND SWITCHES two position toggle switch that provides disc READ ONLY READ WRITE pack file protection In the READ ONLY position inhibit writing on the pack The READ WRITE position enables writing on the pack START STOP A two position that causes manual power up and power down sequencing in normal operations Switch in START position turns on spindle drive motor and loads heads The STOP position retracts heads and turns off the spindle drive motor Indicator Function DEVICE CHECK Indicator illuminates whenever an internal failure or control error is detected Reset by the Disc Controller or power down FILE READY Green file indicator blinks during power up or power down sequences When indicator stops blink ing and illuminates the drive is ready to accept commands from the controller The address file letter is stamped on the lens Figure 2 5 shows the location of the maintenance switches These two toggle switches are not normally used by the operator The function of these switches is given in Table
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102. WD 72233 O2S t GD g Suidas Gm INOW E233 6 UN 2933 g2 D3 A4 23 ined Reference Only Will Not Be Mainta 0826 wutuy 122715 YNOS 8 uoneJodio2 3iseq m Hd sy wk 4 OL ANALNO 2253 2 rsngI1 9 P SNIN SSAG10W e osnel e 150891 O O15 SONY 010 Xxx tO Xx bem 931312345 35 SS3INN 32 3101 5 Col s 7 OSNGIOW Sagan 2509190 51310 9 S081Q0N LSNGIOW gt 2415 193 9 E Tena 2 d p 9uZ20au 0 f E 7 CO 5 S 982248 1 E 6 E Leos J 4 24 Reference Only Will Not Maintained Do Lb ONIAVHO 312517402 RO 035 assy as 32V ans Q3 io vos 0826 vu watuy 199115 q150 SCEL 031112345 359993910 553 197 ET asea 220 14 QNXdO lez 2 STINGS SIIB JH2N Fav 50015 310 _ Os 0 0 xxx xx vax 9 2 0 Vo 35 295059492 Vo VINISTIPL Wh 9S VIP wove 1a EE nang LELE 5979 ELA TEx Snivis el asna ZANE I Lus Id 49 0 2 A4 25 Reference Only Will Not Be Maintained 4 26
103. YNS SIN3A33d Qv3y 193135 Qv3H q H avn 35533009 W S318VN3 W3LSAS 01 g39NAS 542019 x 79979 31v3 31A8 ONY 033733 3193 39 135440 13915 335 5 33404 33GNI1A9 03123130 53394 YZONITAD 30 ONS 0850233 Q39NAS 01d 3 ONY WIL 01 VIVO ZYN SLYAANOD 9395 SOV3H 031937135 NVH1 330N e X30NV30123S 33VSNf LN33302 ILIYM SAVSNN 133315 31M 135330 N3HM QNYWNOJS 31023X3 01 ST1VN9IS 1051302 531551 ANY JALIY 51 9V11081N00 N3HM SININ SNA NO SONVWWOJ 43711081NO0D S300939 ANNO Q V33 N3HM 34VSNn SAYAH Md 391430 NOILN311V AQV33 LON 3LIYM 13S3430 NAHM 33S 14915 4311031N02 SI 9VLOY3H13S N3HM S3NI1 SNA NO SQNVNWO A3WOM3 1353430 SS335Q0QV 535015 553 0 33QNIT1A9 1 93111 AQv33 LON ONY 9V1qv3H13S AQVAY LON ONY 99171494135 e 030907 SgV3H JLAITIGWOINI 333 HOIHM SNOILIGNOD 30333 3L31dWOO 5 323H9 391 30 S193430 Qq31uV1S 33S 830NI1A2 W311 9v10v3H13S 9V11A213S 9v1 1031N02 339 OL 9335 304 SIVNOIS 10341NO2 530551 ONY 3AILOV SI 9V11A213S N3HM SANIT SNA NO 553 00 538015 e SNOILV33d0 30 9933 9NIuna 195330 LNOHLIM YO
104. access cover Remove the four Phillips screws from the bottom of the air shroud to the standoffs on the deck plate 4 3 Lift the a r shroud carefully straight up and off Reinstall the air shroud assembly by following the removal procedures in reverse order Check that the heads are fully retracted before starting the reinstallation Also verify that the gasket along the baseplate and head cam tower is not damaged or deformed during instal lation 4 2 3 CARD CAGE REMOVAL AND REPLACEMENT 1 2 10 11 Set the PWR ON OFF switch to OFF Remove the rear cover Remove all circuit cards from the card cage Note their locations for reinstallation Disconnect all interface cables and the terminator if present Disconnect Pl thru P8 Swing the card cage out Tag and disconnect wires from the backplane Disconnect the Molex connector near the higed end of the card cage assembly Remove the ground strap Remove the restraining cable from the card cage Remove the card cage from the frame by removing three screws To install the replacement assembly reverse the procedure Be sure that the replacement assembly is positioned so that the hole lines up with the bracket in front of the card cage 4 2 4 CARRIAGE AND WAY ASSEMBLY REPLACEMENT The carriage carriage way and head mounting T block are precisely adjusted and aligned at the factory They must be replaced as an assembly whenever any component wears becomes m
105. age Check Points e s s o e o Ac Power Distribution Simplified e Operator Control Panel lt e lt o e gt e o Location of Maintenance Switches e e o Interconnection Diagram 610 730 System e o Disc Drive Functional Block Diagram e e Plug In Card Locations s s o e e o o o Read Write Heads and Matrix Board Configuration Ideal Dibit Pattern e lt s o o e e o Data Separator and Test Point Location End View Clock Frequency Adjustment gt s e s e o e o e Data Window Width e e e s lt e e Data Window Clock Relationship e lt o Connector J30 Pin Locations e e lt lt lt e o o rarus da d arb rib ae ka ss e xO O ui DUK 10 Spindle Lock Assembly e o s o o 11 Speed Transducer Limits e e e 12 Bobbin Mounting Screw Location e s o 3 13 Spindle Drive Component Checks s e 3 14 Dc Voltage Check Points s s e o o o o 3 15 Disc Pack Area Components e s lt e o o o 3 16 Read Write Heads e e s s s e e e o e o e o o o 4 1 Bobbin Mounting Screw Location s e o 4 2 Sequence Relay Assembly Component Locations 4 3 Head Camming Tool Installation e s e
106. amic lift equalizes the spring load pressure at some point above the disc surface so the heads never actually contact the rotating disc surface Head loading and unloading into and out of the disc pack area is carefully sequence controlled to ensure that the disc pack is up to rotating speed before the heads are extended When the heads are retracted they are held apart by nylon camming surfaces that bear on the spring arms of each head The prerecorded servo surface in each disc pack is read continuously by the servo head whenever the heads are loaded onto the pack Signals read by the servo head are processed by the head positioning servo system to provide refer ences for a variety of functions The servo signals are used to Delineate guard band and recording zones on the disc recording sur faces b Position and space the data tracks on the recording surfaces PEN Ce Generate seek operation track crossing clocks for positive track lo cation d Detect on track null points and off track error signals for servo track following Detect start of track index markers Used as a disc speed related byte interval reference clock for syn chronizing data recording and recovery Because the read write heads are mechanically locked to the servo head by the carriage assembly the data track positions are referenced to the pack servo tracks rather than externally to the Disc Drive This technique minimizes pack to pack and dri
107. and data lines all signals will be at standard TTL levels 0 0 to 0 4 VDC equals logical low 2 4 to VDC equals logical high The clock and data lines to the disk units will be differential balanced line driver receivers A2 1 CPU CHASSIS Jl MEMORY J2 MEMORY 33 MEMORY 34 MEMORY j J5 J6 x 37 1320 CPU J8 1320 ACC J9 MTC CNTLR OR DUMMY BOARD J10 HS DMA J11 ADAPTER BUS J12 4 313 PRINTER CNTLR o FORMATTER CHASSIS J2 FORMATTER RADIAL J3 FORMATTER PROCESSOR J4 FORMATTER BUS rnm te p H fi U j j Hd i HT Ni j oF BEN lr H a ME d h ur A T f H 4 H LH i igi lig li d S B E B RADIAL BUS INTERFACE INTERFACE Figure A 2 Disc System Interconnection 610 A2 CPU CHASSIS Jl MEMORY J2 MEMORY OQ 4 J3 MEMORY J4 MEMORY zl J5 HI J6 HS HHH u J7 ADAPTER BUS 38 1320 CPU J9 1320 ACC J10 8 WAY j to J11 PRINTER CNTLR d TIES SII SEE TSE NLS C TUS FORMATTER CHASSIS 92 FORMATTER RADIAL J3 FORMATTER PROCESSOR 34 FORMATTER BUS RADIAL BUS INTERFACE INTERFACE Figure A 3 Disc System Interconnection 700 A2 3 SECTION 3 FUNCTIONAL DESCRIPTION A3 1 GENERAL The Disc Controller consists of
108. ar becomes excessive 4 17 CLEARANCE NOTCH C MOUNTING FLANGE GROUNDING BRUSH Figure 4 6 Spindle Assembly To replace the spindle assembly proceed as follows 4 18 l 2 Set the PWR ON OFF switch to OFF Remove the maintenance access plate from the air shroud assembly four slotted screws Remove the bottom maintenance access plate Remove the drive belt Remove the three bolts that secure the spindle to the deck plate Clean old Loctite from the bolts Remove the spindle assembly from the deck plate by pulling the spindle assembly straight up and out 10 11 12 13 14 15 16 CAUTION spindle and deck plate are machined to extremely close tolerances Cocking the spindle will result in binding against the deck plate and may damage the machined surfaces Remove the grounding button and install it on the replacement spindle shaft or use a new button as required Clean the deck plate and spindle mating surfaces with Freon TF to remove all foreign matter Install the replacement spindle notch on the spindle mounting flange provides clearance for the spindle lock mechanism during removal and installation Do not force it Apply one drop of Locktite grade C to the threads at the ends of the mounting bolts and install the bolts Torque the bolts to 80 inch pounds Install the drive belt To adjust the gap between the transducer and the spindle loosen t
109. ate the head mount over the positioning pin press the head rearward into the T block against the pin and tighten the securing screw with the head torque wrench to 80 inch ounces When the servo head position has been disturbed by removal and replacement of the head all other read write heads must be realigned to the new servo head position by performing the head alignment checkout and adjustment procedure 4 15 4 2 14 SPINDLE LOCK ASSEMBLY REPLACEMENT If the Spindle Lock Assembly Figure 4 5 cannot be adjusted properly replace assembly MEASURE ADJUSTMENT DISTANCE FROM THIS TIP OF ACTUATOR MOUNTING AND ADJUSTMENT SCREWS Figure 4 5 Spindle Lock Assembly 1 Set the PWR ON OFF switch to OFF 2 Remove the maintenance access plate inside the air shroud four slotted screws 3 Remove the spindle lock assembly Figure 4 5 4 Install the replaement spindle lock assembly with hardware removed 5 Perform the Spindle Lock Assembly Adjustment procedure refer to paragraph 3 7 5 4 16 4 2 15 SPINDLE DRIVE MOTOR REPLACEMENT The spindle drive motor is a single phase capacitor start motor that provides high starting torque at low speed A thermal cutout switch protects the motor against overheating Repeated starting and stopping during troubleshooting may trip the thermal switch and is not necessarily an indication that the motor is defective The motor may require up to 1 hour to cool depending on the ambien
110. ates the Disc Controller Circuitry in a block diagram format CPU OUTPUT DATA BUS TO CONTROLLER FORMATTER M D BUS FORMATTER RADIAL RADIAL 1 0 DATA LINES CONTROL LINE NO EURO m 1 M p b Lo au M fr i TERMINATOR a AN al l4 m E 7 I r l r Tq COT HH T 0g ue D ue I sss TT Lit LI Eer r I 1 z A 1 I I DISC ORIVE DISC DRIVE DISC DRIVE l 255 2 3 J Lllcdoclc 4 Figure 1 Disc Controller Block Diagram Al 1 SECTION 2 INSTALLATION A2 1 INSTALLATION Installation of the Disc Controller boards is divided in two functions 1 Adapter PCB s 2 2 Formatter PCB s 3 The Adapter PCB s are located in the Data Processor CPU cabinet s card The Formatter PCB s are located in a special auxiliary card cage in the CPU Electrical requirements for the Disc Controller are DC voltages of 5 volts at 15A and 5 volts at 200 ma A2 2 DISC CONTROLLER INTERCONNECTION SYSTEM 610 The location of the controller PCB s for the Basic Four System 610 is illus trated in Figure A 2 A2 3 DISC CONTROLLER INTERCONNECTION SYSTEM 700 The location of the Controller PCB s for the Basic Four System 700 is illus trated in Figure A 3 A2 4 INTERFACE REQUIREMENTS Signal levels with the single exception of the drive unit clock
111. be less than the value shown below for the appli cable circuit breaker rating CB Rating Resistance 15 Amps 0 30 Ohms 20 Amps 0 25 Ohms 30 Amps 0 15 Ohms If either measurement in step 1 or 2 above is not less than the value given request the customer to provide a power source that meets these requirements 2 3 VOLTAGE CONNECTIONS The power supply for the Disc Drive is not contained in single assembly Single phase AC power is brought to AC input control filter and then switched to the DC power supply AC power connections must be verified and DC voltage checks make as a part of the installation procedures 2 3 1 POWER CONNECTION The unit power cable should be connected to the primary ac power source only after the preceding isolation checks and the following steps have been per formed This is a system of single phase units being connected to a three phase power source Proceed as follows 1 Set START STOP switch on the control panel to STOP and the PWR ON OFF switch at the rear of the unit to OFF 2 Verify that voltage phase and frequency of input power match the available power 3 Check terminal board TB2 Figure 2 1 on the power supply assembly for a jumper wire between the terminal marked OB NTL and the terminal cor responding to the voltage available 4 Disconnect the power supply circuit board shorting jumper from the OPEN spade terminal Reconnect it to the spade terminal marked AC DC GRD SHORT lo
112. cated at E2 Remove after test is completed for system use JUMPER Figure 2 1 Voltage Select Terminal Board TB2 2 2 5 CAUTION Never operate the disc drive as a standalone unit without ac and dc grounds being shorted together at the power supply potential as high 60 volts can develop between the logic ground and the frame resulting in damage to the Disc Drive When operated in a system environment the ac and dc grounds must not be shorted together Connect unit power cable to ac power source 2 3 2 DC VOLTAGE The following dc voltage checks are mandatory and must be performed on all units before offline operational checkout l Set PWR ON OFF switch to ON The blower motor should start and the green File Ready indicator on control panel may start flashing but should go out within 20 seconds Locate connector J10 on the Power Supply circuit board see Figure 2 2 and check for in tolerance dc voltages between the pins listed below a 8 0 to 10 5 volts between pin 4 and pin 9 b 30 to 35 volts between pin 1 and pin 2 30 to 35 volts between pin 3 and pin 2 30V a 30V COM 30V 9V COM x Figure 2 2 Dc Voltage Check Points 2 3 3 Use the DVM to measure the voltage between logic ground card cage terminal E11 and power pins on any circuit board connector connector A or B pin 59 or 60 Dc voltage should be 4 75 to 5 25 volts with an ac ripple component less than
113. ck and make sure that the heads are fully retracted Remove the air shroud assembly with its absolute air filter attached by following the air shroud removal procedure in paragraph 4 2 2 Remove the three screws one upper and two lower that attach the rectangular air filter end cap to the air shroud and lift out the air filter element Install a new filter element make sure that the air flow is correct arrow on the filter element should point to the rear of the assembly and reintall the end cap with the three screws Reinstall the air shroud assembly intake air filter rear cover and front cover 4 2 2 AIR SHROUD ASSEMBLY REMOVAL Access to certain parts and assemblies of the disc drive such as the blower spindle and the absolute air filter require the removal of the air shroud assembly with its attached lid To remove and reinstall the air shroud assem bly proceed as follows l Remove the disc pack if applicable and verify that the heads are fully retracted Set the PWR ON OFF switch to OFF and remove the front panel and rear cover from the disc drive Remove the front air intake foam filter element for access to the two screws on the left hand side of the filter recess that fasten the air shroud to the blower plenum Loosen these two captive screws Disconnect the connector leads from the lid closed microswitch Raise the lid and remove the four slotted screws from the bottom of the air shroud
114. cohol Alcohol runoff into the spindle bearing will cause damage 3 Clean the spindle surface with alcohol and a lint free cloth and wipe the surface dry 4 Use a lint free cloth to remove contamination and grease from the threads of the spindle hole Use a dry lint free cloth to soak up any remaining alcohol 5 Apply a light coat of Molybdenum Grease to a lint free cloth and lubricate the threads of the spindle hole Do not allow lubricant to get on the surface of the spindle 6 Place a disc pack on the spindle to make sure that it can be installed and removed easily 7 Operate the spindle lock by hand to verify that it engages and dis engages freely 3 8 6 CLEANING THE INTAKE AIR FILTER The intake air filter is a foam filter element located behind the Basic Four logo on the front cover It prefilters all air going to the blower and should be cleaned monthly as follows 1 Remove the front cover to gain access to the intake filter 2 Pull out the foam filter element from its recess in the front of the unit wipe the inside of the recess with a damp lint free cloth and dry the recess well 3 31 Do not operate the machine with the intake air filter removed This will cause the absolute air filter inside the unit to load up prematurely 3 Wash the foam filter element in a weak solution of detergent in warm water rinse the element thoroughly in cold water and blow the ele ment absolutely dry with air before reins
115. d squarely over the deck plate locating pins The motor bobbin must also be aligned as per step 6 4 2 9 OFF RACK MICROSWITCH REPLACEMENT If the Off Rack Microswitch Checkout procedure indicates that the microswitch is faulty replace the switch as follows l 2 Disconnect Plug P51 from the microswitch Remove the two screws that fasten the switch mounting bracket to the way assembly and remove the switch and bracket as a unit 4 9 3 5 Install the new microswitch on the mounting bracket by using the original switch mounting hardware Reinstall the microswitch and bracket on the way assembly leave the two bracket screws slightly loose Reconnect plug P5l CAUTION When the heads are extended past the cam tower the pads must be protected from making physical contact with each other This is done by placing folded disposable at least four thicknesses between opposing heads and moving them out slowly so that they come together gently Protect the heads and move them off the cam tower slowly until they are resting on each other Then move the carriage until contact is made with the forward end stop Position the head carriage 0 0025 inch away from the end stop adjust the microswitch until the contacts just transfer and tighten the bracket screws Move the head carriage manually between the end stop and the micro switch transfer point The microswitch should transfer within 0 000 and 0 005 inch of the end
116. d to the rear so that both front and rear tangs on the head mount mate with the proper T block slots on the carriage assembly Figure 4 4 REAR HEAD MOUNTING TANG SLOT SCREW T BLOCK HOLE Figure 4 4 Head Positioning and Mounting Components CAUTION If the arm is allowed to slide forward toward the spindle during any of the following steps the rear tang may disengage from the T block slot If this occurs the head can rotate and slam into the opposing head resulting in damage to both heads 4 14 3 While holding the head firmly against the T block remove the head camming tool 4 Install the two prong prepositioning tool in the hole in the T block and the slot in the head mount and tighten the head mounting screw just tight enough to hold the head in place Remove the tool 5 Connect the head cable plug to the appropriate head receptacle on the Read Write Matrix board and secure it with the cable plug retainer after all heads have been installed 6 After all heads to be installed have been prepositioned according to steps 1 thru 5 perform the head alignment checkout and adjustment procedure refer to paragraph 3 6 1 4 2 13 SERVO HEAD INSTALLATION The servo head is installed with the head camming tool in a manner similar to the other read write heads However the T block has a positioning pin in the servo head locatin that makes the use of the prepositioning tool unnecessary When installing the servo head loc
117. data window 1 nanosecond 3 7 MECHANICAL ADJUSTMENTS Mechanical adjustments are Heads extended Microswitch Off Rack Microswitch and Cover Lid Spring Adjustment 3 7 1 CARRIAGE ACTUATED MICROSWITCHES Two microswitches are actuated by the head carriage assembly over the full tent of its travel into the disc pack area To gain access to these switches for checkout adjustment or replacement raise the pack cover lid remove the disc pack and remove the access plate on the bottom of the air shroud secured in place by four slotted screws One microswitch is for head extended the other is for off rack adjustments Perform the following procedures for checkout and adjustments of the heads extended microswitch 1 Set the POWER ON OFF switch to OFF remove the disc pack and make sure the heads are fully retracted 2 Remove the maintenance access panel inside the air shroud four slotted screws 3 Disconnect plug P50 from the microswitch and measure contact resistances of the microswitch with an ohmmeter Between NO and C lugs should be shorted b Between NC and C lugs should be open 4 Actuate the microswitch manually by moving the carriage out slightly and remeasure contact resistances to see if transfer occurs a Between NO and C lugs should be open b Between NC and C lugs should be shorted 5 If a faulty microswitch was detected in steps 3 and 4 replace the microswitch otherwise r
118. div TP6 Channel 2 Ac 50 mV div TP7 Sync internal on channel 1 positive 0 5 usec div Mode add invert channel 2 1 CARRIAGE MOUNTED 1 TP6 HEAD CONFIGURATION TP REAR VIEM d V GROUND READ WRITE MATRIX BOARD ASSEMBLY Figure 3 3 Read Write Heads and Matrix Board Configuration 10 The dibit pattern shown in Figure 3 4 should be displayed on the oscilloscope Adjustment of the scope sync may be necessary to display a good trace for each head comparison is made between amplitude arm A and B for equal ampli tude Figure 3 4 Alignment is accomplished when arm and B are equal in amplitude 11 3 14 NOTE p The alignment pack requires 30 minutes of running time for temperature stabilization Th UIT Hf Figure 3 4 Ideal Dibit Pattern Proceed only when the alignment pack has stabilized Remove the transparent air shroud held down by four screws covering the carriage and heads and insert the safety pin down through the hole in the top of the cam tower and into the T block assembly WARNING Never place hands or tools in the T block area without having the safety pin installed If the carriage attempts to retract remove all tools and the safety pin then manually pull the heads off the alignment pack as quickly as possible the drive must be left unattended for any period of time remove the safety pin 12
119. dure Remarks Perform all Monthly Preventive Maintenance Procedures Component Use a soft brush or vacuum cleaner or both Internal cabinet surfaces Clean Absolute air filter Replace Refer to paragraph 4 2 1 Check alignment Read write circuits Carriage and Way Refer to paragraph 3 6 1 Check operation Spindle drive circuits Refer to paragraph 3 7 5 3 27 3 8 1 READ WRITE HEADS CHECK For routine head maintenance inspect the read write heads while they are in place for contamination Proceed as follows Ls 2 4 Make sure that the Disc Drive is powered down Open the Disc Drive lid and remove the disc pack Remove the rear cover from the unit and remove the four screws that hold the transparent air shroud Remove the shroud for access to the heads Move the carriage outward by hand no more than 3 8 inch to separate the heads for easier inspection Hold the carriage in this position The head spring arms against the cam surfaces tend to pull the carriage further outward if not restrained and cause the heads to crash together In step 4 do not touch the head surfaces with the inspecting tools Using a pen flashlight or other light source and a dental mirror inspect each head for possible damage and contamination If a head has been damaged it must be replaced Refer to paragraph 4 2 12 for the head removal procedure Dirty heads can usually be
120. econnect plug P50 Do not extend heads past the cam tower or they will slam together resulting in head damage 6 Manually move the head carriage slightly forward The microswitch should transfer click heard within 0 059 and 0 061 inch of travel from the fully retracted position This can be measured with a dial indicator or with an inside caliper and feeler gauges 7 If the step 6 check indicates the microswitch is out of adjustment loosen the two screws that hold the switch mounting bracket to the way assembly position the head carriage 0 060 inch from the fully retracted position adjust the microswitch untl the contacts just transfer and tighten the screws Check microswitch adjustment by repeating step 6 8 Reinstall the maintenance access cover 3 7 2 OFF RACK MICROSWITCH AND ADJUSTMENT The Off Rack Microswitch adjustment is performed in the following manner for checkout and adjustment 1 Set the POWER ON OFF switch to OFF remove the disc pack and make sure the heads are fully retracted 2 Remove the maintenance access panel inside the air shroud four slotted screws 3 Disconnect plug P51 from the microswitch and measure contact resistances of the microswitch with a ohmmeter ae Between NO and C lugs should be open Between NC and lugs should be shorted 4 Actuate the microswitch manually and remeasure contact resistances to see if transfer occurs Between NO and lugs should be sho
121. eed as follows 1 Disconnect the disc drive power cable from the power source and remove both front and rear covers Diconnect and tag the two wires coming from the Ac Input Control Assembly at power supply terminal board TB2 terminals 1 and 2 Disconnect plug P21 from the Sequence Relay Assembly cut the harness ties as necessary Loosen the captive retaining screw that secures the power supply in its normal position and swing out the power supply on its hinges 4 11 Disconnect plugs P10 and 13 from the botto side of the power supply assembly Disconnect the two wires from the bobbin conductor band terminals Disconnect the two green wires from the ground stud under the front of the power supply chassis Slide the power supply assembly off its hinges and remove it To install the replacement power supply reverse this procedure Make sure that the connection from chassis ground to logic ground is reinstalled properly and that the voltage select jumper on terminal board TB2 matches the available voltage 4 2 12 READ WRITE HEAD REMOVAL REPLACEMENT NOTE Certain procedures in this book call for manually extending the heads without a pack When this is done folded strips of lint free disposable tissues should be placed between the facing heads and the heads should be moved slowly outward so that they contact one another as gently as possible To remove a read write head or the servo head for thoro
122. enever the position error voltage indicates that the servo head is approximately 500 microinches off track This upper threshold detector produces a train of pulses from the sinusoidal posi tion signal during seek to cylinder operations from which the difference coun ter down count clocks are produced 3 7 fixed forward reverse offset of 300 microinches can be applied to the servo system under program control for attempted recovery of data which cannot be read without errors when the heads are correctly powitioned This is complished by setting Bus bit 2 active and activating the Set Head Tag line The direction of offset is specified by the state of Bus bit 3 Offset is pro duced by summing a positive or negative bias with the position error voltage so that null is obtained with the heads offset Head offset must be reset before writing or head repositioning is attempted otherwise a device check error will result Offset reset is accomplished by making the Set Head Tag line active with Bus bit 2 reset 3 4 6 REZERO OPERATION When an illegal cylinder address is received or when a seek to cylinder tion is not completed within 700 milliseconds seek incomplete cylinder loca tion reference is lost A Rezero command is required to reestablish this loca tion reference This command is given by setting Rezero Bus bit 8 and acti vating the Control Tag line Rezero places the selected drive in the not ready
123. ent air shroud Make sure the heads are fully retracted Unlatch the power supply assembly swing it out Disconnect and tag the two wires to the linear motor conductor band lugs Remove the tach rod and pickup coil from the linear motor Refer to the Velocity Transducer Replacement procedure paragrph 4 2 19 Note the location of the ground wire and remove the four screws that hold the bobbin to the T block Figure 4 1 When reinstalling the bobbin verify that the ground wire is reconneced and perform the Motor Bobbin Alignment procedure paragraph 3 7 7 CAUTION Do not remove the T block from the carriage The T block is factory aligned to the carriage and way assembly 10 GROUND WIRE T BLOCK BOBBIN MOUNTING SCREWS Figure 4 1 Bobbin Mounting Screw Location Placed folded disposable tissue pads at least four thicknesses between opposing heads to cushion the head pads and move the head out Slowly so that they come together gently Move the carriage forward to get it out of the way Remove the four screws that hold the linear motor to the deck plate torque the screws to 80 inch pounds when reinstalling them Lift the linear motor carefully straight up and out a two man job Watch your fingers during replacement To install the replacement linear motor reverse the procedure Make sure that themating surfaces of the linear motor and deck plate are clean and that the linear motor is positione
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125. five boards Their functions are described in the following paragraphs Two boards referred to as the Adapter located in the main CPU card cage are responsible for interfacing the Formatter to the system The Adapter must handle the I O DMA and Keysearch functions The following functional para meters apply to the Adapter 1 Key Size Min and Max 2 Max Search Length and 3 transfer There are also three boards referred to Formatter They are located in the Auxiliary Card Cage in the lower portion of the CPU cabinet The Formatter is responsible for interfacing and controlling the Disc Drives and for gener ating the formatting and timing The following Disc Drive parameters are con trolled by the Formatter 1 Bytes per Sector 2 Sector per Track 3 Formatted Capacity 4 Average Latency 5 Seek Time Min Avg and Max 6 Total Tracks and 7 Data Transfer Rate A3 2 BLOCK DIAGRAMS Block diagrams of the two different PCB s which make up the Disc Controller are shown in Figures A 4 and A 5 A3 1 TOULNOD VW JI901 ldfp43lNI 39V4W31NI dd 43151934 V1vO QNVWWOO d3 LLVW804 21901 JAVHSQNVH 4300734 GNYWWOD 0 1 Adapter Block Diagram Figure 4 A3 2 39Vdu3lNI 251 21901 333 181 03345 H9IH JAIVAYALNI 351934 V V0 0N2 u31dVav Formatter Block Diagram Figure A 5 A3 3 A3 3 INTERCONN
126. from the rear of the linear motor con nected to the card cage backplane Make sure that the heads are fully retracted Remove the velocity transducer retaining place from the rear of the linear motor two slotted screws Remove the pickup coil and coil retaining spring from the motor Note two pins on one end of the tach rod insertion tool part no 249 060 Insert this end of the tool as far as it will go into the linear motor location vacated by the pickup coil Turn the tool counterclockwise until the two pins engage holes in the tach rod flange Continue turning it until the tach rod is free of the T block and remove the tool and rod together To install velocity transducer components reverse this procedure Place the tach rod inside the tool over the pins to install it Make sure that the tach rod and tool are fully inserted into the linear motor to the mark on the tool and torque the tach rod to 80 inch ounces with the head torque wrench When reinstalling the pickup coil verify that it is inserted into the linear motor as far as it will go Place the retainer spring over the wire leads and use care in reinstalling the retainer plate to avoid cutting the leads 4 2 Servo Logic Logic Logic Cont III III III Timing Chart Logic Logic Servo Logic Logic Logic Logic Logic Logic Logic Logic Logic Logic Logic Logic III III Cont III III II
127. he locknut on the bracket end of the transducer Turn the threaded transducer to move the transducer toward or away from the spindle until contacting a feeler gauge of 0 004 inch thick nonmagnetic shim stock Tighten the locknut Perform the spindle lock assembly adjustment procedure paragraph 3 7 5 Perform the carriage and way alignment check procedure paragraph 3 6 1 Perform the head alignment checkout and adjustment procedure paragraph 3 6 1 Reinstall all maintenance access covers 4 2 17 VELOCITY TRANSDUCER REPLACEMENT The 1 1 transducer consists of two components the tachometer rod tach rod and the tachometer rod housing pickup coil See Figure 4 7 PICKUP COIL TACH ROO INSERTION TOOL Figure 4 7 Velocity Transducer Components and Tool Install and remove both of these components through the rear of the linear motor housing The tach rod is fastened internally to the T block while the pickup coil is held stationary inside the linear motor A spring holds the pickup coil in position Replace velocity transducer a follows CAUTION The tach rod is very brittle and will break if not handled carefully Do not use a tach rod that has been dropped even if it doesn t break its magnetic characteristics may have been altered 1 Set the PWR ON OFF switch to OFF 2 Remove the rear cover 3 Swing out the logic card cage assembly 4 20 4 10 11 Velocity transducer wires
128. hen a balance is reached between the voltage applied to the linear motor and the voltage fed back from a velocity transducer stationary coil and moving tach rod inside the linear motor Each time the servo head crosses a servo track a clock pulse that reduces the difference counter count by one generated Maximum velocity will be maintained until the difference count falls below 256 Below the count of 256 the drive signal to the servo system is reduced proportionally with the linear motor re sponding to balance out the signal with the output of the velocity transducer Imbalance due to the momentum of the bobbin and carriage causes a braking volt age to be applied to the linear motor to slow the heads as they approach the correct cylinder difference count of zero 3 6 When the difference count is reduced to zero the head will be within proximately 0 002 inch of the desired track and the head positioning servo system is switched back to operating in the track following mode The servo system then locks onto the closest symmetrical dibit null point Once this occurs the seek to cylinder operation is complete and following a l millisec ond delay the drive returns to the ready condition and sends a seek completed interrupt on the Attention line Head repositioning times vary from 6 milli seconds for a single cylinder seek to either adjacent track to as long as 55 milliseconds for seeks across all cylinders These
129. ion 249110 Head Caming Tool 249020 Head Positioning Tool 249030 Head Positioning Tool Inl 249040 Torque Wrench Head Mount 249050 Pin Safety 249060 Tach Rod Insert Remo Tool 249100 T80 CE Pack 249010 Extender PCB 3 1 3 4 FUNCTIONAL DESCRIPTION Figure 3 1 is general block diagram and shows the functional groups that ecute disc drive oeprations and the interfacing command data and status lines that connect the disc drive to the controller 1 The Interface and Control Circuits control access to the drive gen erates the control signals for head positioning from the controller signals and prevents further operations until a device check failure is reset 2 The Disc Pack Drive Circuits controls the power up and power down sequences loads the heads initially and controls emergency head retraction 3 The Head Positioning Servo Circuits controls head positioning and generates the bit rate and byte rate clocks 4 The Read Write Circuits enable the addressed read write head con verts NRZ data to and writes to the disc read from the disc and converts TFM to NRZ detects address sector and index markers and provides the data clock to the controller 5 The Error Detection and Status Circuits monitors status from the other circuit groups generates status signals for the controller and operates the DEVICE CHECK indicator 6 The Power Circuits include the power protection and distribution of input power a
130. isaligned is damaged Replacement because of wear is indicated when the assembly cannot be brough into Carriage and Way Alignment Check tolerances by performing the alignment procedure 4 4 This is a precision assembly and is easily damaged and rendered useless if the way bearing surfaces are scratched or if disassembly is attempted Replacement and alignment require a high level of technical skill It is recommended that only factory trained personnel attempt replacement Special tools are also necessary To replace the carriage and way assembly proceed as follows l 10 Set the PWR ON OFF switch to OFF and disconnect the ac power cable from the source Unload the disc pack if installed and remove the front and rear covers from the disc drive Remove the transparent air shroud disconnect and remove all heads from the T block and store the heads safely Remove the air shroud assembly Remove the Read Write Matrix board Remove the four screws lockwashers and flat washers that hold the head cam tower to the deck plate and remove the cam tower Disconnect plugs P50 and P51 from the carriage actuated microswitches and remove the two microswitches with their mounting brackets attached Remount the microswitches on the replacement assembly torque the mounting screws to 100 inch ounces Remove the four screws that attach the carriage to the linear motor bobbin Note the position of the grounding
131. ive or separately The subassemblies located within the Disc Drive Assembly are the air shroud spindle spindle drive motor head carriage logic card cage linear motor power supply relay assembly and blower 1 2 1 Air Shroud The air shroud surrounds the disc pack The air shroud contains and directs the filtered air which is forced through the Disc Drive 2 Spindle Spindle Drive Motor The spindle drives the discs when the disc pack is in place The spindle is driven by a spindle drive motor 3 Head Carriage The head carriage is the mounting for one servo read and five read write heads The carriage is moved to position the read write heads over to a selected cylinder of the disc pack by read ing the servo read head 4 Logic Card Cage The logic card cage holds six plug in boards which contain the disc drive control logic read write logic and servo circuits The interface cables to the rest of the system also plug into the card cage 5 Power Supply The power supply provides all DC power for the Disc Drive The power supply also contains the emergency head retracting circuits 6 Relay Assembly The relay assembly holds the relay and solid state switches that perform power up and power down sequencing 1 4 SPECIFICATIONS WARNING This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions manual may cause interference to radio co
132. lliseconds Pack rotational speed 3600 RPM 3 Recording Method Bit serial Triple Frequency TFM Maximum latency time 17 6 milliseconds Average latency time 8 3 milliseconds Data transfer rate 1 209 000 Bytes second Start or stop time 20 seconds CHAPTER 2 INSTALLATION 2 1 UNPACKING PACKING PROCEDURE 11 replaceable spares are shipped in specially designed containers which provide protection against moisture dust and contact damage The following procedures apply upon receipt of the replacement unit l Examine the shipping container for dents or cracks If any are found they shall be reported to the Branch Office immediately so that corrective action can be taken Open the container and remove the units then examine for damage or missing parts per the shipping list 2 2 PREINSTALLATION Check that the ac line includes a third wire earth ground that meets or exceeds the requirements of the National Electrical Code This can be checked by the following procedures l Locate the circuit breaker that supplies power to the Disc Drive With a digital voltmeter set to measure 20 volts ac and the circuit breaker turned on measure the drop between the green and white wires at the power source wall outlet The measured voltage must be less than 1 8 volts ac Switch the source circuit breaker off Measure the resistance between the green and white wires at the power source wall outlet The resistance must
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134. lution and dry the cleaned surface Moisten the adhesive side of the new gasket with activator solution and position it on the cover lid Verify that the gasket is not deformed by having been stretched and that all edges are held down tight Reinstall the cover lid and air shroud assembly Keep the lid closed for several hours to ensure a good adhesive bond 4 2 6 DRIVE BELT REPLACEMENT The spindle drive belt is made accessibel by removing the bottom maintenance access cover Replacement is reuired if there is any evidence of belt deteri oration such as fraying or stretching Proceed as follows to replace the belt Set the PWR ON OFF switch to OFF Extend the disc drive unit Remove the bottom access cover Pull the spindle drive motor toward the spindle and against the ten sioning spring to slacken the belt and slip the belt off the motor pulley Install a new belt in the same manner as the old belt was removed in step 3 Spin the drive motor belt and spindle by hand to make sure that the belt rides in the center of both pulleys If the belt is not centered on both pulleys slacken the belt center it on the spindle pulley and adjust the motor pulley height as neces wary There are two setscrews on the motor pulley one on the key and one on theflat part of the shaft Repeat step 5 When the belt rides correctly replace the bottom access plate and return the unit to its normal position 4 2 7 HEADS EXTENDED
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136. metic subtractor to obtain a cylinder difference count If the cylinder address on the bus lines is a legal address raising the tag line strobes the subtractor output into a difference counter If the cylinder address is illegal a device check will result The new cylinder address is stored by the drive in its cylinder address register 350 nanoseconds after the Set Cylinder Tag line goes active The value strobed into the difference counter indicates the number of tracks to be crossed by the servo head to reach the location of the new address This number can be positive negative or zero If positive a forward toward the spindle seek will be enabled And if the difference count is zero no seek operation will occur Seek starting begins when the controller terminates the Set Cylinder Tag line signal a minimum of 800 nanoseconds later If the difference count is not zero dropping the tag line signal places the head positioning servo system in to the seek enable mode by changing from track following mode to velocity mode Starting the seek operation puts the drive in the not ready condition The maximum velocity that the forward or reverse seek operation will attain is controlled by the magnitude of the difference count difference count of 256 more will cause the head positioning servo system to be driven by maximum linear motor current to an absolute maximum velocity of about 90 inches per second Maximum velocity is limited w
137. mmunications as temporarily permitted by regulation It has not been tested for compliance with the limits form Class A Computing Devices pursuant to Sub part J of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference Operation of this equipment in a residential area is likely to cause inter ference in which case the User at his own expense will be required to take whatever measures may be required to correct the interference 1 3 Table 1 1 gives the operational specifications for the Disc Drive TABLE 1 1 SPECIFICATIONS Parameters Characteristics PHYSICAL Height with Cabinet Height without Cabinet Width Depth Weight POWER Voltage Current Power Frequency Heat Output ENVIRONMENTAL Temperature Humidity GENERAL Tracks per cylinder Cylinders per pack Bytes per track Bytes per cylinder Bytes per pack unformatted Recording Density 29 8 inches 75 7 cm 10 5 inches 25 4 cm 17 8 inches 45 1 cm 32 0 inches 81 3 cm 285 pounds 129 3 kg 115 230 VAC 8 5 4 25 26 13 to start 977 5 VA 60 50 Hz 2100 to 2550 Btu hr 65 to 75 18 to 24 40 to 60 non condensing 5 plus servo track 813 numbered 000 thru 814 20 160 100 800 82 15 million M2580 6060 Bits per inch nominal TABLE 1 1 SPECIFICATIONS continued GENERAL Access Time Track to Track 6 milliseconds Maximum 55 milliseconds Average 30 mi
138. n When the emergency retract relay is removed the access mechanism is completely disabled It is possible to damage the heads and pack by allowing pack to stop rotating with the heads extended Do not therefore allow the drive to be stopped turned off or left unattended without first manually unloading the heads by returning the carriage to its fully retracted position 5 3 16 Scope Settings 1 volt division use 10 probes 100 nanoseconds division X10 magnifier off initially Display channel 1 attach channel 1 probe to clock signal Trigger INTERNAL CH1 NEG SLOPE auto or normal mode Adjust the trigger level control for a stable trace and verify that the full cycle time of the clock signal is approximately 103 nano seconds 10 full cycles display in slightly more than 10 divisions Manually position the carriage slowly away from the spindle until the ready light goes out the head load area The clock is now free running having no dibit signal to control the oscillator Ad just R14 if necessary to set the fre running period to approximately 103 nanoseconds Figure 3 5 R3 FACTORY ADJUSTMENT Pot is actually upside down on PCB e R14 CLOCK FREQUENCY ADJUSTMENT R31 DATA WINDOW SKEW ADJUSTMENT R36 DATA WINDOW WIDTH ADJUSTMENT TP3 DATA WINDOW GROUND TP1 CLOCK TP4 GROUND nF Figure 3 5 Data Separator and Test Point Location End View Turn o
139. n the X10 magnifier and adjust the horizontal position to left until the last pulse is near the center of the screen Center the trace vertically Move the carriage slowly toward the spindle until the ready light goes on The servo head is now reading the outer servo band which may cause the trace to jitter Move the heads further in if neces sary to stabilize the trace This is the vicinity of cylinder 0 Hold the carriage here for the first measurement 10 11 12 13 14 15 16 Adjust the horizontal position control until the trailing edge of the last pulse is aligned with the center vertical line of the graticule at the mid amplitude point Figure 3 6 FINAL ADJUSTMENT HEADS IN LOAD ZONEI DISPLACEMENT AT CYLINDER 800 DISPLACEMENT AT CYLINDER 0 Figure 3 6 Clock Frequency Adjustment Move the carriage toward the spindle slowly and observe that the pulse moves to the right as the VCO tracks the dibit signal Allow 5 seconds for the speed to stabilize after reaching the vicinity of cylnder 800 and then note how far the pulse has shifted between cylinder 0 highest pack speed and cylinder 800 lowest pack speed Move the carriage away from the spindle until the heads barely touch the lifting cams With no dibit signal the clock is free running at this time Adjust R14 if necessary to position the pulse halfway between the early and late extremes determined in step ll Approximately 5 nano sec
140. nd the regulated DC power supplies 3 4 1 DISC DRIVE OPERATIONS The Disc pack contains five l4 inch diameter ferrusoxide coated discs with precision spacers that are firmly mounted on a hub Only the inner three discs are used these provide five data recording surfaces and one prerecorded track reference servo surface The top and bottom discs serve only as protective covers for the recording surface The five data recording read write heads and the servo read only head are rigidly mounted to a head positioning carriage as facing pairs and spaced and aligned to approach the upper and lower surfaces of the inner three discs pre cisely The recording heads are assigned head address numbers O through 4 from top to bottom The servo head reads from the top surface servo surface of the middle disc Recording heads are aligned so their recording pole pieces are positioned axially within 50 microinches of the servo head pole pieces 3 2 S3NI1 11915 ONY 19133391 NAS 118 39019 3 9 3 ZAN VLVG 3 0 3 380315 V 1VQ 304 3311031N09 01 32012 INAS LIA S3QlAO3d e X3QNI S193130 SUSU SS3uQQV 5123130 QNV SILIYM X8VW 5533449 31l3W AYAY 3002 ZYN S1fdino 347 380315 5930933 W41 9 33 e 05 033733 ONINSSI A8 13538 38 A1NO NYO S323H2 321A3Q 533S 17937111 ONY Ss33uQQv 330NI142 1993771 13S3 SI23H2 391430 V TILNA SNOILY334d0 ASIO WAHL
141. onds of cumulative difference should exist for 10 clock cycles from track O to track 800 Referring to Figure 3 6 verify that the clock pulse shifts left earlier when the heads are positioned in the vicinity of cylinder 0 then to the right of the free running position later when positioned in the vicinity of cylinder 800 This completes the clock frequency adjustment Change the scope display to chop sweep mode and connect the channel 2 input to TP3 data window See Figure 3 5 Adjust the horizontal position control to display the second pulse of the channel 1 trace 3 17 17 Position the carriage in the data cylinder area and adjust the scope vertical position controls to display the channel 2 waveform with ts mid amplitude point centered vertically on the graticule 18 Adjust R36 for a data window pulsewidth of 47 5 nanoseconds measured at the midamplitude points Figure 3 7 Figure 3 7 Data Window Width 19 Adjust the scope s position controls for the display shown in Figure 3 8 DATA 47 5 NS DEEP min p s TRAILING EDGE CENTERED IN Sl e DATA WINDOW La NM DATA WINDOW ss EUIS Figure 3 8 Data Window Clock Relationship 3 18 20 Adjust R31 for minimum delay fully clockwise This is important Now adjust R31 counterclockwise so the trailing negative slope of the clock signal CH1 is centered in the negative portion of the
142. or test point locations TABLE 3 5 POWER SUPPLY VOLTAGE CHECK CONNECTOR J10 From Pin To Pin Output 02 01 30 to 35V 02 03 30 to 35V 09 04 T0 8 to 10 5V 3 29 30V aw 30V COM 30V 9V COM Figure 3 14 Dc Voltage Check Points Alternatively these voltages may be checked at the fuse block located on the frame base beneath the card cage assembly Check voltages at these fuses with reference to dc ground card cage terminal Ell There are no power supply adjustments for these voltages If any one is out of tolerance the power supply should be replaced refer to paragraph 4 2 10 3 8 4 CLEANING THE DISC PACK AREA 1 Open the pack area lid and remove the disc pack 2 Wipe the inside of the air shroud Figure 3 15 with a lint free cloth dampened with alcohol Wipe it dry and remove all residue AIR ENTRY SPINDLE HOLE SPINDLE LOCK CLEANING PORTS RE THREADS ACTUATOR REF BRUSHES AIR SHROUD ACCESS COVER REF 3 30 Figure 3 15 Disc Pack Area Components 3 Clean the inside of the pack area lid with the alcohol dampened cloth Wipe it dry and remove all residue 4 Inspect the lid gasket for evidence of deterioration and wipe the gas ket clean if necessary 3 8 5 CLEANING AND LUBRICATING THE SPINDLE 1 Open the pack area lid and remove the pack 2 Inspect the spindle Figure 3 15 for dirt or other contamination and for wear CAUTION Do not saturate the spindle surface with al
143. orrect locations Use the prepositioning tool for initial alignment and torque the heads to the full 80 inch ounces Reconnect the ac powre cable set the PWR ON OFF switch to ON and perform the appropriate steps of the head alignment checkout and adjustment procedure to align the heads Perform the carriage and way alignment check procedure refer to para graph 3 6 1 If carriage and way alignment is out of tolerance the alignment procedure will have to be repeated The heads will have to be removed but not that further disassembly is unnecessary as the alignment procedure can be carried out through the access cutout in the air shroud When carriage and way alignment and head alignment check out replace the transparent air shroud and the two covers 4 2 5 COVER GASKET REPLACEMENT l Remove the air shroud assembly refer to paragraph 4 2 2 from the drive and the cover lid from the air shroud assembly Note that the cover gasket is not multipositional but has a slight locating protrusion at the bottom of the cover The new gasket must be installed in the same position Reactivate the adhesive that holds the old gasket in place by soaking the edges of the gasket with an activator solution of 92 percent l 1 1 Trichloroethane and 8 percent isopropyl alcohol by volume Continue to pry and soa the gasket with activator solution until the gasket is free of the cover Clean the lid surface free of adhesive with more activator so
144. pable of storing 80 million bytes of readily accessible data The removable pack be comes a semipermanent extension of the CPU memory in a data processing system Programs and files are stored on the disc Access time is sufficiently short that storage and retrieval of data appears to be instantaneous to the operator 1 2 PURPOSE This manual is the primary source of information for field maintenance It contains the necessary information to repair and maintain the Disc Drive It contains both physical and functional descriptions installation operation maintenance procedures and equipment supplied This information shall enable an experienced Service Engineer to identify isolate and repair the Disc Drive to a defective subassembly or printed circuit board 1 3 PHYSICAL DESCRIPTION The Disc Drive is packed as a single unit The three main parts of the Disc Drive are 1 Cabinet 2 Disc Drive Assembly and 3 Removable Disc Packs The Disc Drive Cabinet has a control panel pack area lid front cover and rear cover Figure 1 1 illustrates the locations of the main parts and their subassemblies the removable Disc Pack is not shown 1 1 LOGIC MEAD CARD CAGE CARRIAGE LINEAR MOTOR SPINDLE POWER SUPPLY AIR SHR0UD SPINOLE DRIVE MOTOR RELAY ASSEMBLY BLOWER PACK AREA LID Figure l 1 Locations of Major Components The removable disc packs BFC part number 902490 can be shipped with the Disc Dr
145. rted b Between NC and lugs should be open 3 20 3s If a faulty microswitch was detected in steps 3 and 4 replace the microswitch Otherwise reconnect plug P5l CAUTION When the heads are extended past the cam tower the head pads must be protected from making physical contact with each other This is done by placing folded Kimwipes at least four thick nesses between opposing heads and moving them out slowly sothat they come together gently Protect the heads and move them off the cam tower slowly until they are resting on each other Then move the carriage until contact is made with the forward end stop The microswitch should transfer click heard within 0 000 and 0 005 inch before the carriage con tacts the end stop This measurement can be checked with feeler gauges If the step 6 check shows the microswitch to be out of adjustment loosen the two screws that hold the switch mounting bracket to the way assembly position the head carriage 0 0025 inch from the end stop adjust the microswitch until the contacts just transfer and tighten the screws Check microswitch adjustment by repeating step 6 Retract the heads manually and remove the tissue pads as the heads are cammed apart Inspect the heads for contamination and reinstall the maintenance access cover 3 7 3 COVER LID SPRING ADJUSTMENT The cover lid is held in the raised position by a torsion spring at the bottom of the lid This spring when
146. t temperature Other drive motor components such as starting capacitor Cl sequence relay and solid state switches Kl K2 and K3 can also prevent the drive motor from operating and should be checked out before drive motor replacement is consider ed If the drive motor is defective replace it as follows 1 Set the PWR ON OFF switch to OFF 2 Remove the front and rear cover 3 Remove the bottom maintenance access plate 4 Disconnect P22 from the relay assembly 5 Pull the drive motor toward the spindle and slip the drive belt from the motor pulley 6 Remove the motor pulley from the end of the drive shaft 7 Remove the four bolts that secure the drive motor to its mounting plate swing out the power supply assembly and remove the motor from the top 8 To install the replacement motor reverse the procedure 9 Spin the pulley by hand to ensure that the drive belt runs straight and true If necessary adjust the vertical position of the pulley 4 2 16 SPINDLE ASSEMBLY REPLACEMENT The spindle assembly Figure 4 6 is a precision unit with sealed bearings that requires an occasional cleaning and relubrication of the pack mounting threads It should never be removed from the deck plate unless replacement is necessary as removal requires complete reaignment of the head positioning system Replacement of the spindle assembly occurs only if pack mounting or unmounting difficulties are experienced thread wear or when bearing we
147. talling it 4 Reinstall the clean dry filter element or a new filter element if deterioration had occurred in the filter recess and replace the front cover 3 8 7 CLEANING THE READ WRITE HEAD Figure 3 16 1 Dampen a lint free cloth with Freon TF and clean the contaminated head pad surface 2 Dry the head pad with a lint free cloth 3 Reinspect the head pad to make sure that the head is clean and free of residue Also check adjacent heads to be sure they have not been con taminated by the cleaning operation 4 If oxide cannot be removed in this way the head will have to be removed for more thorough cleaning or for replacement CONFIGURATION HEADS GREEN LEFT DOWN SERVO GREEN LEFT UP 2 RED RIGHT UP 1 4 RED RIGHT DOWN 0 3 Figure 3 16 Read Write Heads 3 32 4 1 SPARE PARTS LIST Item No 10 11 12 13 14 15 TABLE 4 1 MM Number 240010 240040 240080 240090 240330 240340 240350 240360 240420 240430 240440 240450 240460 240470 248010 CHAPTER 4 Manufacturer Part Number 12449 002 15847 001 18752 001 12452 002 R6060RGB3001R R6060RGB4001R R6060RGA1002 R4040NSA2002R 17589 001 17530 001 17771 001 19508 001 903050 100575 12332756 001 REMOVAL REPLACEMENT PROCEDURES REPLACEMENT PARTS FOR DISC DRIVE Part Description Assy Power Supply 115V PCB Logic II PCB Servo Control T 80 Assy Sequence Relay 115V Head R W 01 T 80 Head R W
148. ugh bench cleaning or replacement proceed as follows 4 12 l 2 Power down the disc drive and remove the disc pack Remove the rear cover set the INTERFACE DEGATE switch to DEGATE and the PWR ON OFF switch to OFF Take out the four screws that secure the transparent air shroud cover ing the carriage assembly and cam tower and pull the shroud straight up and off Remove the head cable plug retainer from the Read Write Matrix board and disconnect the cable plug of the head being removed CAUTION Do not overflex the head arm when installing the head camming tool during the next step or permanent damage to the head will result 5 Install the head camming tool the head assembly to be replaced as shown in Figure 4 3 MIDDLE PIN END PIN Figure 4 3 Head Camming Tool Installation 6 Unscrew the mounting screw that attaches the head assembly to the carriage T block Carefully remove the head 4 13 install a read write head after bench cleaning and inspection or to replace a head proceed as follows CAUTION Do not overflex the head arm when installing the the head camming tool during the first step or permanent damage to the head will result 1 Install the head camming tool on the head assembly to be replaced as shown in Figure 4 3 2 Insert the head assembly with the camming tool installed in the cor rect position by setting the arm on the proper cam and then sliding the hea
149. ve to drive interchangeability problems 3 4 2 POWER UP SEQUENCING Initially the linear motor bobbin and attached head carriage are in the fully retracted position with the heads drawn apart by camming surfaces on the head arms that make contact with the cam tower When power is turned on only the S blower motor power supply and disc drive logic circuits are activated Pow er up sequencing is initiated by activating the START switch on the front panel or by the controller through a sequence control line 3 4 3 4 3 HEAD LOAD Head loading also called first seek is always the final operation performed during a normal power up sequence When the disc pack has come up to a speed sufficient to fly the heads 95 percent of 3600 RPM a load speed voltage is applied to the linear motor bobbin to drive the carriage and heads forward at a nominal speed of 7 to 10 inches per second The heads continue to move forward under direct load speed control until they reach the outer margin of the head load zone of the disc pack At this point the camming surfaces of the head arms leave the cam tower and allow facing heads to be lowered onto the disc surface air boundary layer The Disc Drive switches from direct load speed control of head motion to a track following mode as soon as the servo head begins picking up a signal from the recorded outer guard band Track following is a servo mode of operation under control of the ser
150. vo head signal Since all 22 tracks of the outer guard band are of the plus pattern no dibit signal will be detected Instead these identical tracks generate a head position error voltage that causes the servo controlled linear motor to continue to drive the heads in the forward direc tion When the servo head approaches the track 000 position intersection of the outer guard band and the minus track pattern of the recording zone servo sys tem will lock on track 000 when the dibit signal becomes symmetrical Locking in detenting on cylinder 000 completes the power up sequence and head load operation and the Disc Drive goes into the drive ready condition sending an attention signal to the controller The entire operation from the start of power up sequencing through the first seek to sylinder 000 to the drive ready condition takes approximately 20 seconds 3 4 4 SEEK TO CYLINDER OPERATION A cylinder is defined as all five recording tracks that are accessible to the read write heads for a given track position of the servo head A new cylinder address and a seek start command are required to move the heads to a new posi tion 3 5 The controller initiates a programmed seek by placing a cylinder address the bus lines minimum of 200 nanoseconds later the controller activates the Set Cylinder Tag line to strobe the bus address into the subtractor Here it is compared with the current head position address by an arith
151. wire for later reassembly Remove the three bolts and lockwashers that hold the carriage and way assembly to the deck plate and carefully remove the assembly tilt it to clear the conductor band support bracket CAUTION Exercise great care in handling the replacement carriage and way assembly Particularly the coating on the bearing surfaces which is easily damaged by careless tool handling Clean the mating surfaces of the dewck plate and the replacement carriage and way assembly with alcohol and wipe them dry 4 5 11 12 13 14 15 16 17 18 19 20 21 Pos tion the replacement carriage and way assembly on the base plate and reinstall the three mounting bolts leave them loose Perform the carriage and way alignment procedure Reconnect the carriage to the linear motor bobbin with the four Screws removed in step 8 and perfpr the motor bobbin alignment procedure refer to paragraph 3 7 7 Perform the heads extended switch checkout and adjustment refer to paragraph 3 7 1 and the off rack switch checkout and adjustment procedures refer to paragraph 3 7 2 Make sure that plugs P50 and P51 are reconnected to the microswitches after adjustment Reinstall the head cam tower by using the hardware removed in step 6 Torque the mounting screws to 45 inch pounds Reinstall and reconnect the Read Write Matrix board Reinstall the air shroud assembly Clean and reinstall the heads in their c

Modell 2500 Fixed Disk Drive Service Manual / Century Data Txx

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