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JULY I.980 FSOlSO5i REV. 1

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2. Symmetry Amp Ensures exact zero referencing of the signal Time Domain Filter Trims and further shapes the signal Signal Gate Produces a single pulse out for each logic level transition at its input This results in the reproduction of the original FDC signal 2 13 During a read operation the Read Write Head produces two 180 out of phase signals These are very weak highly distorted versions of the original signals pro duced by the Write Logic Data Gate The Read Data Conditioning circuitry must amplify square up and filter the read signals to reproduce the original serial string of bits produced by the FDC This re produced signal is returned to the FDC by the Read gt Data Conditioning circuitry PASE TIME REGEN 44 DOMAN ERATOR FILTER SYMMETAY 4 DIFFER OW FERENTIATOR VERENA 4 READ WAITE HEAD CLOCK I 10 PIA DATA Tinea DATA 8115 FLOPPY CONTROLLER status HESET Signal Decay WO WRITE PROTECT PULSE RECEN ERATOR mp SYMMETRY OF FERENTIATOR ZERO CROSSING DETECTOR DIFFERENTIAL READ WRITE HEAD ERASE DRIVER Two 180 out of phase signals are generated by the head during a read operation and amplified by the Differential Amplifier The Differentiator squares the two out of phase signals The Zer
3. RITE VERIFICAT ION Gl A108 RITE amp ERASE LOGIC CIRCUITRY RITE PROTECT CIRCUIT RITE PROTECT WIRING HARNESS ERO CROSSING DETECTOR 10 5 4 4 2 13 9 7 9 5 1 3 7 5 10 6 18 19 37 38 6 20 36 6 24 27 2 4 17 2 13 2 1 2 13 15 i 11 6 11 49 6 18 37 5 1 2 5 6 13 46 6 53 9 8 2 11 2 12 2 10 11 2 21 2 16 4 5 6 8 4 7 2 13 15
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5. CARRIER ASSEMBLY HEAD ASSEMBLY BEARINGS Identify the level of disassembly required and complete the sequence of steps indicated above DISASSEMBLY DISASSEMBLING THE DISK DRIVE CASE WARNING Unplug the Drive s AC transformer from AC power BEFORE opening the case 1 With the Disk Drive rightside up on a suitable work surface locate and remove the four adhesive screw hole covers on the tophousing 2 Locate and remove the four screws securing the top housing to the base 3 Lift the tophousing from the base and set it aside CAUTION The record playback and erase head sub assembly is extremely sensitive to magnetic fields DO NOT se magnetized tools or articles when working inside the Drive case or near the Drive transport 6 5 REMOVING THE COMMON BASEPLATE NOTE Removal of either the side PCB rear PCB or Drive transport requires removal of their common baseplate from the Disk Drive base 1 Disassemble the Disk Drive case Disconnect the AC transformer power cord from the PWR jack at the rear of the Drive chassis 3 Disconnectany I O cables from the I O CONNECTORS at the rear of the Drive chassis 4 Locate and remove the fiv screws securing the common baseplate to the base Carefully lift the baseplate from the base Note that each of the bosses in the base is topped with a rubber washer NOTE As you
6. MYLAR FILM 22uf 20 145 158 CER AXIAL 22uf ALTERNATE FOR ITEM 8 ELECTROLYTIC 10uf 16V 50 105 n FADIAL C143 160 470 0 50 107 RADIAL C150 151 2 4700uf 25V 50 10 RADIAL C146 C148 149 RESISTOR 1 1 chm 1 4W 5 R139 22 ohm 1 4W 5 8173 100 ohn 1 4 R138 147 174 162 163 240 ohm 1 4W 5 R148 330 ohm 1 4W 5 R146 220 ohm 1 4W 5 R141 750 ohm 1 4W 5 R170 820 ohm 1 44 5 R167 1K 1 41 5 R137 149 151 154 156 3 3K 1 4W 5 R155 2K 1 4W 5 R150 2 2K 1 4W 5 R159 160 171 145 3 9K 1 4W 5 R161 4 7K 1 4W SZ R164 168 7 5K 1 49 5 R169 10 1 4W 52 R140 143 152 153 157 158 165 166 IMEG 1 41 5 R144 36 1 2W 5 R172 VARIABLE 500K R142 INDUCTOR 680uhy L103 DIODE 11914 CR110 119 1 4001 8109 115 118 501 CR111 114 TRANSISTOR 253904 0116 117 MPSA06 0114 115 810 REAR BOARD SOURCE CA014161 lof iTEM NO PART NUMBER CA015326 015505 014386 01 014386 02 014725 014715 12995 014719 03 014716 03 014719 02 014796 014025 014641 11 P P d MCN OM IND P P E rere DESCRIPTIO TRANSISTOR amp HEATSINK ASSEMBI I C SOCKET 8 PIN I C SOCKET 14 PIN SWITCH LOGIC S101 CONNECTOR POWER JACK J110 13 PIN 23 PIN 5106 3 PIN J104 J105 5 PIY J103 109 LATCHING FASTENER PCB PCB SERIAL NO LABEL SEE MFG A CAP ELECTROLYTIC
7. Gl SCREW 6 32 1 4 PHIL SCREW 4 40 3 8 PHIL SCREW 4X1 4 THD FRM WASHER SHOULD INSULATOR LOCKWASHER NUT 4 ASSY ER 55 REAR PCB SUB ASSY PCB FAB REAR HD PHIL HD SCREW 6X5 16 THD F PHIL HD SCREW 32X1 4 PHIL HD PCB ASSY SID PCB SUB ASSY PCB FAB SCREW GROUND BRACK H _ E SIDI _ E RF SHIELD INSIDE COMPONENT RF SHIELD OUTSIDE TRACE MOUNTING PLATE SOURCE REQUIREI PER V ERSION 01 3 4 1 1 1 2 1 60 61 62 3 64 65 66 67 68 69 70 71 72 T9 74 75 76 77 78 79 8 0 81 82 75 AL612 82 AL608 CA014122 CA014121 011506 014845 015303 015304 col 5 9 9 0015936 CA015598 XX DESCRIPTION SCREW 6 3 4 SHEETM P H PHIL SCREW 6 1 2 B T PHIL HD CABLI Y 18 PIN CABLE SUB ASSY GI m SHIPPING LABEL WARRANTY CARD POLY ENVELOPE ASSY RETAILER WARRANTY CARD POLY ENVELOPE PUBLICATIONS QUESTIONNAIRE SERVICE CENTER LIST PACKET SOURCE Gl ITEM NO PART NUMBER QTY DESCRIPTION 1 014179 03 CER AXTAL 10pf 20 coc C122 2 C014179 04 1 33pf 5 COG C141 3 C014179 02 4 47p 10 C101 103 131 119 4 C014179 07 T 62pf 10 COG C105 5 C014180 03 4
8. SECTION Serer eee Omm pee Mi aa s CIRCUIT IsrATUS INFO lt i i RESET TO STEPPER MOTOR LOGIC TO DISKETTE ORIVE MOTOR LOGIC DATA OUT BUFFER TO AND FROM COMPUTER CONSOLE DATA INPUT OUTPUT AND MANIPULATION SECTION The Drive s PIA is primarily a buffering and signal formatting device with no decision making or compu tational capability It is responsible for the following Applying the Console s serial outputs to the Data and Address Busses when requested by the Drive s Microprocessor Unit MPU Assisting in the control of the Read Write and Erase Head position by buffering commands sent to the Stepper Motor Logic Assisting in control of the Diskette Drive Motor Logic Providing 128 bytes of RAM for temporary storage of status information and data sent by the Data Interface Section for application to the HP 2 6 500 kHz i MH TO AND FROM M DATA INTERFACE SECTION MAPPING bay m CIRCUIT Fa STATUS INFO 4 RESET RAM TO STEPPER DISKETTE DRIVE MOTOR LOGIE TO FROM COMPUTER CONSOLF DATA INPUT OUTPUT AND MANIPULATION SECTION The MPU provides the primary decision making and computational capabilities for the Disk Drive The Drive s MPU is responsible for the following Controlling data transfers through its control over the Common Data and Addre
9. and B invert function with two probes B Atari 400 800 Computer Console with minimum 16 RAM installed ex 1 0 cables and Console Drive power packs D Disk Alignment Cartridge or Program E Master Alignment Diskette 0 050 hex setscrew driver G Non conductive common blade tuning wand CAUTIONS Take extreme care when handling and storing the master alignment diskette The Disk Drive PWR ON lite should be ON and the BUSY lite should be OFF whenever you are inserting or removing a diskette from the unit DO NOT open the Drive door or turn Drive power off when the BUSY lite is on 7 8 1 Connect the Drive to the Computer Console 2 Turn the Drive on and wait for the BUSY lite to go off Insert the master alignment diskette 3 Either insert the disk alignment cartridge or load the disk alignment program into the Console 4 Via the Console command the Drive to read track 16 Dis Set the oscilloscope controls as follows DISPLAY A B B inverted TIME DIV 20 msec DIV VOLTS DIV 20 mv DIV 6 Compensate your scope probes Is Connect a ground probe from the scope to the faston lug ground at the rear of the transport 8 Attach the channel A probe to the rear lead of CR154 Channel A Probe To C154 fa Channel Probe To C155 9 Attach the channel B probe to the rear lead of EISS 7 6 10 CENTER _ LINE A AMPLITUD
10. securing the RF shield case halves together on the side PCB CAUTION Excessive bending of the metal tabs will break them DO NOT bend the tabs anymore than necessary 52 Locate remove the two screws securing the case halve to the ground bracket and PCB 6 Carefully disengage the case halves from each other and the PCB Set the case halves aside REMOVING THE DRIVE TRANSPORT 1 Disassemble the Disk Drive case 2 Remove the common baseplate from the Drive base 3 Remove the side PCB 4 Grasp the transport securely tip the assembly upside down and place it on a suitable work surface Locate and remove the four screws that secure the transport to the baseplate The screws are accessibl only from the underside of the baseplate CAUTION The transport provides critical mechanical alignments necessary for proper Disk Drive operation Be very careful not to jar or damage the transport or any of its associated sub assemblies and components Place the transport and baseplate on a suitable work surface REMOVING THE EAR PCB Disassemble the Disk Drive case Remove the common baseplate from the Drive base Remove the side PCB from the common baseplate A YF Locate and remove the four screws securing the rear PCB to the common baseplate 5 Grasp the rear PCB on both side edges Carefully lift the board straight up far e
11. EEE sasa suu aw s POSSIBLE CAUSE D BIRNE EMOQ COR TACH LINE OUT OF PLACE 0 WRITE PROTECT CIRCUIT BAD C DRIVE BELT INCOR RECTLY TENSLONED E ELECTRICAL MALFUNC TION DRIVE MOTOR CIRCUIT REAR PCB F SPINDLE BEARINGS FREEZING A EJECT MECHANISM T NEXBBDADDJSSTNNG OR IS BROKEN 3 CLUTCH CONE TO SPINDLE CLEARANCE DOOR OPEN TOO SMALL CORRECTIVE ACTION D DRIVE BELT STRETCHED CONNECT GREEN MOTOR HARNESS LEAD TO CENTER TERMINAL OF WRITE PROTECT HARNESS REPLACE TRANSPORT LEFT 51 DEPLATE ADJUST DRIVE BELT TENSION REPLACE DRIVE BELT REPLACE AND OR TROUBLESHOOT PCB REPLACE SPINDLE BEARINGS ADJUST OR REPLACE SHIM THE CLUTCH CONE ASSEMBLY FRONT DOOR WONT OPEN DRIVE CONSOLE SYSTEM WILL NOT BOOT UP OCCASIONAL READ ERRORS ALL TRACKS a TTF FARRER aaa aaa EES SS DOOR LATCHING MECHANISM NEEDS ADJUSTMENT OR IS BROKEN IVE MOTOR SPEED INCORRECT CANT FIND TRACK 00 ELECTRICAL MALFUNC TION SIDE AND OR REAR PCBCS STEPPER MOTOR MAL FUNCTIONING RADIAL TRACK MIS ALIGNMENT BAD HEAD DAMAGED DISKETTE DIRTY OR MAGNETIZED HEAD WGRN OR DIRTY HEAD PRESSURE PAD CCRRCCTIVE ACTION Hi 181 i ADJUST OR REPLACE DOOR LATCH MECHANISM ADJUST DRIVE MOTOR SPEED ADJUST TRACK 00 STOP SETSCREM REPLACE AND OR TROUBLESHOOT PCBCS REPLACE STEPPER MOTOR COMPLETE RADIAL T
12. lation and operating instructions STEPPE LOGIC AND 400 800 COMPUTER DATA LE CONS INPUT OUTPUT ANO MANTPULAT ON POWER SUPPLY ATARI 810 FLOPPY DISK DRIVE The ATARI 810 Floppy Disk Drive consists of the following major sections Data Input Output and Manipulation Data Interface Read Write and Erase Heads Stepper Motor and Logic Diskette Drive Motor and Logic Power Supply 2 4 DATA INPUT OUTPUT AND MANIPULATION SECTION L AND FROM V DATA INTERFACE 2 I Ir SECTION lt t 07 Ld W VAS LaDURESS EPA Honan gt STATUS INFO 1 RESET vov v RAM 10 STEPPER MOTOR LOGIC lt 7 TO DISKETTE DRIVE MOTOR LOGIC lt TO AND FROM COMPUTER CONSOLE DATA INPUT OUTPUT MANIPULATION SECTION Data control commands and a VCC RDY signal from the Computer Console enter the Disk Drive through either of the two serial I O connector jacks at the rear of the Drive chassis Each of the three main signal input lines are buffered for static protection and to reduce power consumption on the 800 I O lines Data is sent by the Console in serial format with checksums accompanying the data for validity verification 2 5 Amet INS TO AND FROM CGS SE EARN DATA INTERFACE Ld
13. 100pf 20 X7R C110 130 139 140 6 014180 10 E 390pf 5 X7R 111 7 C014180 07 470 20 X7R 106 8 C014181 01 16 C01uf 480 202 250 C113 116 118 C123 129 134 138 9 014181 03 8 is n luf 80 207 250 C102 104 107 109 C114 115 4353 10 014369 1 ELECTROLYTIC RADIAL 4 7uf 35V 75 10 C132 11 2 14 5181 RESISTOR 1 1 ohm 1 4W 5X R125 3 14 5151 1 150 ohm 1 4W 5 R117 4 14 5221 1 n 220 ohm 1 4W 5 R103 15 14 5271 2 di 270 ohm 1 4W 5 R120 126 6 14 5331 1 330 ohm 1 44 5 R132 17 14 5471 1 470 ohm 1 44 5 R106 8 14 5102 6 p 1X 1 44 5 118 121 124 129 9 14 5152 1 1 5K 1 44 5 R114 20 21 14 5332 1 3 3K 1 4W 5 R115 22 14 5472 4 4 7K 1 4W 5 R110 116 128 133 23 14 5562 2 5 5 6K 1 4W 5 R101 102 24 14 5103 4 H 105 1 4W 5 R105 109 113 134 25 14 5153 2 8 155 1 44 5 112 108 26 14 5273 1 275 1 44 5 R131 27 14 5333 1 335 1 47 5 RILI 28 14 5393 1 39K 1 44 5X R104 29 14 5473 2 47K 1 49 5 R119 130 30 14 5104 2 LGOK 1 44 5 R135 136 31 14 5224 1 220X 1 4W 5 R127 32 14 5750 1 75 ohm 1 4W 5 R175 33 34 6014102 1 INDUCTOR 470uh L101 35 6014384 2 FERRITE BEAD L102 103 36 37 31 1N914 3 DIODE 14914 CR120 CRl21 CR122 810 SIDE BOARD SOURCE m CA014162 lof4 REV 10 8 6 NO PART NUMBER OTY DESCRIPTION 38 31 124001 5 DIODE 104001 CR101
14. 104 106 39 0014808 01 1 DIODE ZENER 19452318 5 1V 57 CR107 40 41 co14394 4 TRANSISTOR 0106 109 42 33 6 3 2N3906 Q101 103 104 43 34 2N3904 4 283904 0102 105 110 111 44 014316 CRYSTAL 1 000000 mhz 101 45 C014386 07 2 SOCKET IC 24 PIN Lb C014386 08 1 SOCKET IC 28 PIN 47 C014386 09 2 SOCKET IC 40 PIN 48 C014386 02 6 SOCKET IC 14 PIN 49 014717 01 CONNECTOR 23 101 50 014719 02 2 CONNECTOR 5 101 102 51 C014397 XX WITCH POWER S102 52 53 014024 54 014379 1 RESISTOR NETWORK 9 4 7 SIP R176 55 015325 2 LED 8 STANDOFF ASSEMBLY 810 SIDE HOARD SOURCE CA014162 2of4 10 8 7 ITEM NO NO ee PART NUMBER QTY C014179 08 5 101474 14180 05 60141897 01 C014180 08 C014181 02 014181 03 010394 014181 05 014392 014368 014780 14 5181 14 5220 14 5101 14 5241 14 5331 14 5221 14 5751 14 5821 14 5102 14 5332 14 5202 14 5222 14 5392 14 5472 14 5752 14 5103 14 5105 15 5360 9 411504 CCL4703 31 1N914 31 1N4001 014308 34 2 3904 014394 Grr eee FO j rn 3 p DESCRIPTION CAP CER AXIAL 82pf 10 COG C159 MYLAR FILM 47u 100V 10 C152 n CER AXTAL 205 107 X7R t C153 Odide 480 202 250 C154 156 120 0047uf 20 X7R C157 Oluf 80 20 250 C147 luf 80 20 250 161 163 144
15. DEMAGNETIZATION DIFFERENTIAL AMP I DIFFERENTIATOR DISASSEMBLY DISASSEMBLY FLOW CHART DISASSEMBLY REASSEMBLY DISK DRIVE SELECT DISK ROTATION DISKETTE DISKETTE DRIVE MOTOR amp LOGIC DOS DRIVE BELT DRIVE BELT ADJUSTMENT DRIVE MOTOR I 10 3 6 13 46 7 1 1 6 6 54 3 3 4 6 9 3 4 4 2 18 6 38 6 5 56 7 7 8 7 3 2 9 4 9 2 11 25 2 11 12 2 4 5 2 4 10 7 3 2 13 15 2 13 15 6 5 6 4 6 1 3 2 19 2 23 2 23 24 2 4 18 4 7 6 14 45 7 13 14 7 13 6 15 44 SETUP SIGNAL GATE INDEX SILKSCREEN REAR BOARD SILKSCR SPECIFICATIONS SPEED ADJUSTMEN I SPINDLE DRIVE SPINDLE SHAFT B STEPPER MOTOR SIDE BOARD EARINGS STEPPER MOTOR amp LOGIC SYMMETRY AMP THEORY OF OPERATION IME DOMAIN FIL TRACK f STOP TER DJUSTM TRANSPORT DRIV TRANSPOR FLYWH I EL DRIVE Z FA SPINDLE TROUBLESHOOTING GUID VCC RDY SIGNAL VOLTAGE REGULATOR WIRING HARNES RITE DRIVER U tu RITE amp ERASE GATE RITE OPERATION H H E PROTECT I EST
16. out to track 32 and return to read track 16 9 Verify that the lubes are still within 80 amplitude of each other If they are not return to step 2 NOTE Steps G thru 3 check the hysterisus within the head positioning system If you are unable to achieve the results indicated suspect 1 a broken or damaged setscrew 2 a binding and misaligned positioning band 3 binding of head assembly to guidercds or 4 a bad stepper motor 11 Disconnect the scope probes except for the ground lead from the drive circuit 12 Reset the scope DISPLAY to channel A only 13 Attach the A channel probe to ANODE side of 110 tachometer output Channel A Probe To Anode CR110 14 Command the Driv 15 to read any track Refer to the following guide for correct tachometer frequencies If the tested fre quency is not correct adjust R142 SPEED ADJUSTMENT GUIDE DRIVE MOTOR I DRIVE MTR PULLEY DIAM RE APPROX PART NUMBER Mylar yellow Mylar yellow Neoprene black TRACK 00 STOP ADJUSTMENT The following are required to perform this procedure Atari 400 800 Computer Console with minimum 16K RAM installed I O cables and Console Drive power packs Disk Alignment Cartridge Console or Disk Alignment Program Master Alignment Diskette 0 050 hex setscrew driver 0 010 inch flat or round feeler gage Conne
17. the Disk Drive is turned on The RESET references th lectrical circuits to their starting conditions Additionally the Power Up Logic circuit locks the Data Output Buffer off during a short period when the Drive is turned on This prevents random pulses generated by the Drive s circuitry during the initializing period from being sent to the Console The Drive s Clock circuitry generates both a crystal contolled 1 MHz and a 500 KHz clock signal The 1 MHZ signal is used by the Data Interface Section The 500 KHz signal is used both as a clock signai to the MPU and to time data exiting from the Data Input Output and Manipulation Section into the Data Interface Section DATA INTERFACE WRITE PROTECT CLOCK IJ 10 PA 1 Time DOMAN FLIER DATA 65 32 FLOPRY CONTROLLER 7 WRITE AND ERASE status GATE p SYMMETRY DIFFERENTIATCR Low LEVEL ERASE ERASE READ WRITE DRIVER HEAD The major element of the Data Interface Section is a RESET ZERO CROSSING DETECTOR OF FERENTIAL AMP Floppy Disk Controller FDC FDC is a highly specialized microprocessor It is responsible for the following activities Combining data timing and data validity pulses into the serial format to be recorded Separating the above and providing the ou
18. the transistor into position on top of the insulating plate Secure the transistor insulating plate combination to the common baseplate with a 4 40 x 3 8 PHIL HD screw shoulder washer 4 splitring lockwasher and a 4 ST2 hexnut 46 gU Screw go A108 Common 2 Baseplate e Apply Heat 77 Transfer Cpd If you are installing 108 voltage regulator a Apply heat transfer compound to the back of the voltage regulator b Position the regulator onto the common baseplate Secure the device to the baseplate with a 4 x 1 4 THD F PHIL HD screw Attach the rear PCB to the common baseplate a I INSTALLING THE REAR PCB Carefully lower the rear PCB into position on the common baseplate Ensure that the Six device legs at the right side of the baseplate are correctly seated into the two three pin sockets on the PCB 2 to secure the PCB to the baseplate 3 Connect the transport to the common baseplate INSTALLING THE DRIVE TRANSPORT CAUTION The transport provides critical mechanical alignments necessary for proper Disk Drive operation Be very careful not to jar or damage the transport or any of its associated sub assemblies and components 1 Carefully set the transport upside down on a suitable work surface 2 Gently set the transport upside down on top of the transport Z 1 3 Install and tighten the four screws 6 32 x 1
19. 14748 CA014862 01 C014760 015554 016065 014759 014156 014157 014105 12972 CO14106 88 1010 CA014158 CA014318 CO14324 CO12972 014086 5 1004 014085 014159 014039 014082 PRODUCT CARTON END CAP END CAP DOS FILI INSERT POWER ADAPT INSTRUCTION DOOR CLOSE POLY FINAL ASSY UPPER ASSY BAG Gl MGR r OQIN 04 PKG D DISK PROGRAM MANUAL PANEL LABEL COVER COMMON BASE HOLE COVER LABEL MOUNTING LQWER ASSY PAD FASTESER BAS FASTENER COMMON BASE CONNECTOR RUBBER FEET PANEL ASSY LOGO LABEL ERIALIZATION LABEL NAMEPLATE LABEL 8 3 LABI WARNING SH INSERT SHEET ASSY SOURCE QTY REQUIRED PER VERSION 01 gt e e P 31 32 33 34 35 36 37 38 33 40 41 42 43 45 46 47 48 43 50 51 52 53 54 55 56 57 58 59 NUMBER 012976 CO14026 CA014160 75 046 CA014072 72 16045 72 14065 72 CL404 CO14814 CO14811 75 044 75 914c CA014833 CA 014161 CO14025 72 CL605 72 16045 CA014834 CA014162 CO14024 72 CL605 014138 014136 014137 12977 DESCRIPTION DISC PANEL PRIMARY ITEM 31 ALTERNATE FOR MOUNTING PLATE LOCKWASHER DISK DRIVE
20. 1X3 HOLIMS 193135 A1dans 4 3 LINDYID HOLON 15780333 q p SEES A gt 4 a 6 4 A w gt le L ee NM FLOPPY QUICKCHECK This procedure should he completed both as a pre service checkout and final post service checkout for the Disk Drive As a pre service checkout it will assist in identifying problems in the Drive As a final checkcut it will ensure that all repairs and alignments were successfully completed This procedure follows this flow chart TROUBLE PROC DURES BOOTING TEST FORMATTING TEST All tests must be completed in the sequence shown The following are required to perform these procedures A Atari 400 800 Computer Console with a BASIC cartridge and minimum 16K RAM installed I O cables Console Drive power packs XV D Master Disk File Manager diskette with write protect notch taped E Blank scratch diskette not write protected F Prerecorded sample diskette with DOS and sample programs recorded on a known good Disk Drive SETUP 1 Connect the Drive to the Console and connect both to power 24 Turn the Drive ON and wait for the BUSY lite to go off If BUSY lite does not come on and then go off recheck connections then refer to the Troubleshooting Guid
21. 4 PHIL HD and 1 6 splitring to secure the transport to the baseplate 4 Set the assembly rightside up on the work surface 9 10 NOT Locate and connect the record playback and erase head I O wiring harness shielded red blank blueand either white black or black white to the r amp r PCB nonpolarized X4 Locate and connect the drive motor ground wiring harness yellow green blue red black to the rear PCB nonpolarized 3 If you removed the side PCB follow the procedures to attach the PCB to the common baseplate If you did not remove the side PCB during disassembly a Locate and connect the stepper motor wiring harness black white red green brown to the side PCB nonpolarized 2 b Locate and connect the write protect wiring harness black green blank red black to the side PCB nonpolarized 1 Goon to step 10 Attach the common baseplate to the Drive base E See Appendix for alternate wiring harness arrangement 6 50 INSTALLING THE RF SHIELD SIDE PCB CAUTION Excessive handling of the locating tabs on the shield case will break them DO NOT bend the tabs anymore than absolutely necessary 1 Carefully position the case halves onto the side PCB 2 Position the ground bracket onto the side PCB 3 Install and tighten the two screws 46 32 x 5 16 TRD F PHIL HD to secure the ground bracket to the PCBand case halve
22. A NOTE To remove the drive belt without stretching or damaging ixotate the large flywheel marked for strobe while easing the belt off the outside edge of the flywheel REMOVING o THE TRANSPORT DRIVE MOTOR Disassemble the Disk Drive case Remove the common plate from the Drive base Remove the Drive transport from the common baseplate Remove the drive belt from the transport Locate and disconnect the single black ground lead coming from the drive motor wiring harness and going to the transport casting Kd While supporting the drive motor with one hand locate and remove the two screws securing the drive motor to the transport casting Separate the drive motor from the casting REMOVING CARRIER AS BLY 1 Disassemble the Disk Drive case 25s Remove the common baseplate from the Drive base 22 Remove the Drive transport from the common baseplate 4 Locate the head assembly and slide the assembly all the way to the rear of its travel ES an FH Y 5 gt y Q S Al w 5 Locate and loosen approximately two full turns but do not remove the two screws securing the carrier assembly to the rear of the transport casting 6 Locate the four screws securing the front panel bezel to the side guide assemblies and the transport casting 7 Loosen do not remove the two bottom screws ipproximately f
23. ATARI 810 DISK DRIVE FIELD SERVICE MANUAL JULY 1980 FS015854 REV 1 10 TABLE OF CONTENTS SPECIFICATIONS THEORY OF OPERATION BLOCK DIAGRAMS amp SCHEMATICS FLOPPY QUICKCH Gl CK TROUBLESHOOTING GUID DISASSEMBLY REASSEMBLY ADJUSTMENTS PARTS LISTS APPENDIX INDEX SPECIFICATIONS co A o N 10 TECHNICAL SPECIFICATIONS Uses ANSI standard 5 inch diskettes in a soft sectored format 40 tracks at 48 TPI track density Single density FM single sided recording Over 90K bytes storage per diskette 709 sectors of 128 bytes each Minimum data access time 236 milliseconds Average data transfer rate 6000 bits per second Automatic stand by capability built in microprocessor Up to four Drives can be daisy chained to a single 400 800 Computer Console w minimum 16K RAM via select switches at the rear of the Drive Drives directly interface with the ATARI 400 800 Computer Console 16K RAM or indirectly through the ATARI 850 Interface Module or 820 Printer 1 3 THEORY OF OPERATION THEORY OF OPERATION The ATARI 400 800 Computer Console with 16K of RAM installed connects directly to the 810 Floppy Disk Drive The Drive may also be daisy chained through the 820 Printer or the 850 Interface Module up to four Disk Drives can be connected to a single Console Refer to the Disk Drive Operators Manual for instal
24. CT LED PHOTO TRANSISTOR WIRING HARNESS CON NECTIONS REPLACE TRANSPORT LEFT SIDEPLATE DISASSEMBLY REASSEMBLY DISASSEMBLY AND REASSEMBLY The level of Disk Drive disassembly will vary with the specific problem ncountered Some procedures list steps which are themselves procedures ie Disassemble the Driv case When you encounter an underlined step turn to that procedure first and follow it before proceeding SPECIAL NOTES l Refer to the Disk Drive and 400 800 Operators Manuals for proper Drive setup and operation 2 Disk Drive circuitry includes static sensitive MOS devices AllDrive repairs should be performed at static protected work surfaces Anyone handling Drive PCBs should wear a grounding strap 3 Toprevent thread damage use only the specified screws 4 Overtightening screws will strip the threads on plastic and aluminum parts Do not exceed 6 inch pounds torque for plastic parts or 10 inch pounds torque for aluminum parts 5 Internal wiring connections are made with wiring harnesses terminated by nonpolarized pins and jacks Be sure all pins and jacks are correctly installed before trying to operate the Disk Drive 6 When reassembling the Drive ensure that all wiring harnesses are routed in such a way as to prevent them from being pinched between reassembled parts 6 3 4 DISASSEMBLY FLOW CHART COMMON BASEPLATE RF SHIELD SIDE PCB
25. E FIG A CAT S EYE PATTERN The scope should be displaying a repeating cat s eye lobe pattern as shown above a If the lobes are of equal amplitude go on to step 11 b If the lobes are of unequal amplitudes proceed as follows L CN Positioning 9 Band Locate the setscrew securing the stepper motor positioning band pulley to the stepper motor shaft Positioning Band Pulley 2 With the Drive still reading track 16 4 back the setscrew out counterclock wise of the pulley about 1 4 turn Leave the setscrew driver in the pulley Slightly rotate the pulley either clockwise or counterclockwise until the scope shows equal amplitude cat s eye lobes Tighten the setscrew and remove the setscrew driver 5 Verify that the lobes are still within 80 amplitude of each other If they are not return to step 2 6 Via the Console command the Drive to step back to track 24 and return to read track 16 ON TO gq TRACK16 17 TRACK 15 RANGE 80 ACCEPTANCE 1 mil off 1 mil off track 16 track 16 2 mil off 2 mil off track 16 track 16 1 3 mil off 3 mil off track 16 track 16 Cat s Eyes DISPLAY AS A FUNCTION OF READ HEAD to TRACK 16 POSITION 1 Verify that the lobes are still within 80 amplitude of each other If they are not return to step 2 8 Via the Console command the Drive to step
26. ESS ARRANGEMENT 9 8 G ERROR CODES ERROR ERROR CODE _ ERROR CODE MESSAGE CODE _ ERROR CODE MESSAGE 2 Memory Insufficient 142 Serial Bus Data Frame Overrun 3 Value Error 143 Serial Bus Data Frame Checksum Error 4 Too Many Variables 144 Device Done Error 5 String Length Error 145 Read After Write Compare Error 6 Out of Data Error 146 Function not Implemented 7 Number Greater then 32767 147 Insufficient RAM 8 INPUT Statement Error 160 Drive Number Error 9 Array or String DIM Error 161 Too Many OPEN Files 10 Argument Stack Overflow 162 Disk Full 11 Floating Point Overflow 163 Unrecoverable System Data 1 0 Error Underflow Error 164 File Number Mismatch 12 Line Not Found 165 File Name Error 13 No Matching FOR Statement 166 POINT Data Length Error 14 Line Too Long Error 167 File Locked 15 GOSUB or FOR Line Deleted 168 Command Invalid 16 RETURN Error 169 Directory Full 17 Garbage Error A 170 File Not Found 18 Invalid String Character 171 POINT Invalid NOTE The following are INPUT OUTPUT errors that result during the use of disk drives printers or ocher acces sory devices Further information is provided with the auxiliary hardware 19 LOAD Program Too Long 20 Device Number Larger 21 LOAD File Error 128 BREAK Abort 129 130 Nonexistent Device 131 IOCB Write Only 132 Invalid Command 133 Device or File not Open 134 BAD IOCB Number 135 IOCB Read Only Error 136 EOF 137 Truncated Record 138 Devi
27. ING Remove the THE HEAD ASSEMBLY Disassemble the Disk Drive case Remove the common baseplate from the Drive base Remove the Drive transport from the common baseplate carrier assembly from the trans IOT Ls Nylon Clamp Locate the nylon clamp securing the record playback and erase head I O wirinq harness to tho right rear corner of the casting Release the clamp from the casting Push the head assembly as far to the rear of the Drive as it will slide Locate and remove the ground lead black wire from the drive motor wiring harness faston from the rear of the casting 6 21 8 Locate the two screws securing the stepper motor positioning band to the right side of the head assembly a Remove the rear screw being very careful not to crimp or damage the band and noting the screw and washer arrangement b Slide the head assembly carriage forward enough to allow you to remove the front band screw Remove the front screw again noting the screw and washer arrangement NOTE The stepper motor positioning band is very delicate and very important to the operation of the Drive NOTkink or damage the band in any way 6 22 3 Locate the two screws securing the carriage guiderod clamps to the drive casting 10 Remove the two screws and lift the guiderod clamps away rom the assembly ll Carefully pry the two guiderods up out of their locating notches in the drive casting 12 G
28. O 1 NO 2 PWA NG 4 A double Single pole Double throw switch gives the Disk Drive operator the ability to assign a number to and therefore a code for addressing each of up to four Drives that could be daisy chained together The switch is accessible at the rear of the Drive chassis The switch settings are read by the Drive s MPU through the PIA H2v 0 REG 5V OC REG OC REG 12 OOUBLER EXTERNAL STEP DOWN XFMR 120 VAC RECTIFIER P1 DOUSLER POWER SUPPLY An external step down transformer is supplied with each Drive The 120 VAC line Power is dropped to 9 VAC by the transformer This 9 VAC enters the Drive through the PWR jack at the back of the chassis Turning the Drive s front panel PWR switch ON applies the 9 VAC to a full wave bridge rectifier The Power Supply provides the following The unregulated 9 10 VDC Diskette Drive Motor supply regulated 5 VDC A regulated 12 VDC initially produced by a voltage doubler circuit A zener regulated 5 VDC also produced by a voltage doubler circuit A PWR lite LED is turned on through the 5 VDC section of the supply READ WRITE AND ERASE HEADS Er A magnetic head converts electrical currents into magnetic fields and vice versa The Read Write Head consists primarily of two ferrite core halves wound w
29. RACK ALIGNMENT REPLACE HEAC ASSEMBLY REPLACE DISKETTE CLEAN AND DEMAGNETIZE HEAD REPLACE HEAD PRESSURE PAD SYMPTOM INNER TRACKS OUTER TRACKS DRIVE WONT WRITE DATA REL 3 7 mx OVERSTRESSED PRESSURE PAD ARM SPRING DRIVE MOTOR SPEED INCORRECT ELECTRICAL MALFUNC TION IN READ CIRCUIT DRIVE MOTOR SPEED INCORRECT ELECTRICAL MALFUNC TION IN READ CIRCUIT DAMAGED DISKETTE ELECTRICAL MALFUNC TION IN WRITE CIRCUIT 5 6G sas ac CORRECTIVE ACTION 2 au REPLACE SPRING OR HEAD ASSEMBLY ADJUST DRIVE MOTOR SPEED REPLACE AND OR JUBLESHOOT REAR PCB SIDEPCBOR CCHECK FOR SLOW Q1020RZ1040 N SIDE ADJUST DRIVE MOTOR SPEED REPLACE AND OR TROUBLESHOOT REAR PCB SIDE PCB OR HEAD CCHECK 9155 VALUE ON RPCB REPLACE DISKETTE PCB AND OR SHOOT REAR SIDE PCB OR HEAL 11 12 OUS ERROR CODES DURING OPERATION DRIVE INCOMPATABILITY DRIVE WRITES ONTO WRITE PRO TECTED DISKETTES ELECTKICAL OR CHANICAL MALFUNCTIONS DRIVE MOTOR SPEED INCORRECT RADIAL TRACK MIS ALIGNMENT MALFUNCTIONING WRITE PROTECT CIRCUIT CHECK TO ENSURE DISKETTE 1 NOT WRITE PROTECTED REPLACE 7105 REPLACE AND OR TROUBLESHOOT PCBS TRANSPORT ADJUST DRIVE MOTOR SPEED COMPLETE RADIAL TRACK ALIGNMENT CHECK WRITE PROTE
30. RADIAL 47uF 16V 50 1 0 RIGHT ANGLE 5107 108 PROCEDURE 810 R EAR BOARD SOURCI 2014 E CA014161 H pw ah 12 ITEM NO PART NUMBER QTY DESCRIPTION 1 CA014161 1 PCB SUB ASSEMBLY 2 14332 1 LM311 109 3 C010174 XX 3 TRANSISTOR ARRAY A107 110 111 4 014348 1 VOLTAGE REGULATOR 108 810 REAR BOARD Nat listed an source CA014833 SOURCE CA014833 20 2 REV 1 l CA014162 1 PCB ASSEMBLY 2 C011299 1 IC CUSTOM ROM Al 02 3 014329 1 FLOPPY CONTROLLER 1771 A105 4 10745 1 CUSTOM 101 5 C010750 1 IC CUSTOM A104 6 014328 1 LC 7 TRANSISTOR ARRAY A103 7 014334 2 IC 4013 2101 105 8 C010447 1 XC 4077 2104 9 6014333 1 Ic 4011 2102 10 011465 1 4069 n 2103 11 C010174 XX 1 IC TRANSISTOR ARRAY A106 12 014136 1 INSIDE COMPONENT R F SHIELD 13 014137 1 OUTSIDE TRACE R F SHIELD i5 72 CL605 2 SCREW 6x5 16 TED F PHIL ED 16 014138 1 GROUND BRACKET COl4641 10 PCB SERIAL NO LABEL SEE MFG PROCEDURE 810 SIDE BOARD SOURCE CA014834 20f2 REV 3 ram B n he muti LZ Appendix A ATARI 810 Block Diagram Appendix B 810 Side Board Schematic Appendix C 810 Side Board Silkscreen Appendix D 810 Rear Board Schematic Appendix E 810 Rear Board Silkscreen Appendix F 810 Wiring Harness Diagram Alternate Appendix G ERROR Code Listing
31. W 5 UNLESS OTHERWISE SPECIFIEO ALL CAPACITORS ARE IN yF NOTE 19191543 815 TINN t LI 3 D 24 on zz 0918 10 pia eris ee 5519 1 5 B Let oo wr v xo xo ects itu xor wor u ze M l Juv 034235 m i919 1 0 4 eu Ls i Itc 2 our 0519 nw S OLDINNOD 0 1 A0W 22 vin M x zi b 440713 354105 Quvog JO uv34 QuVMOL 38 15 HOLIMS MOVIE AG Mb I SWHO NI SHOISIS3H 8 31 NI 3 SHOll2VdvO Y 9313123245 35 3 1 SS31Nn 2 71 S31GN 9 7 DRIVE WRITE HEAD STEPPER MOTOR PROTECT 1 0 MOTOR 103 109 JIO2 REAR BD SIDE BD 1 a 000 REAR BD 0 SIDE BD 2695 2695 2695 2695 GR BLACK Tum x RED BROWN RED J BLACK LE HEAD PHASE 2 BLUE GREEN GREEN Ves SHIELD PHASE 1 PHASE 3 YELLOW 1 BLUE P WHITE zw RED GREEN 7 BLACK HEAD 2 TACH GEN ERR Pe REB Rho OUTPUT A C CAN BE INTERCHANGED ALTERNATE WIRING HARN
32. and pulley on the stepper motor shaft Tighten the rear band retaining screw CAUTION DO NOT exceed 6 inch lbs torque when tightening screws into plastic parts 6 34 17 28 19 Use a pointed tool ie X acto knife point etc to hook the small hole on the front end of the positioning band Pull forward slightly on the band while tightening the front band retaining screw Attach the black ground lead drive motor wiring harness to one of the faston lugs at the rear of the transport Attach the carrier assembly to the transport INSTALLING THE TRANSPORT SPINDLE SHAFT BEARINGS 15 Gently insert either the top or bottom or both shoulder bearings into the casting bore There should be a slight friction fit NOTE If excessive force is required you probably have incorrectly identified the bearing Obtain the correct bearing before proceeding Upper Spindle Shaft Shoulder Bearing Transport Casting Bore SS Lower Spindle Shaft w Shoulder Bearing 5 Ensure that the shoulder of the bearing is firmly seated flat against the casting 3 Attach the flywheel and drive spindle to the transport 6 36 INSTALLING THE TRANSPORT FLYWHEEL DRIVE SPINDLE 1 the transport casting on its side Diskette Drive Spindle Transport Casting ER Flat 52 Spacer Wavy pu ai Washers k pr Washer Splitring LoOCKwasner 5 Flywhee
33. ce Timeout 139 Device 140 Serial Bus 141 Cursor Out of Range INDEX ERASE DRIVER ERASE HEA ERROR CODES FLOPPY DISK CONTROLLI FLYWHEEL FORMATTING FORMATTING TES BEAD ASSEMBL HIGH LEVEL DRI INDEX 9 Y V LOW LEVEL DRIVE MPU PARTS LISTS PCB REAR PCB SIDE PIA POWER SUPPLY POWER UP LOGIC CIRCUIT PULSE REGENERATOR 0113 TRANSIST QUICKCHECK RAM REASSEMBLY EAD DATA COND EAD OPERATION OR RADIAL TRACK ALIGNMENT ITIONING CIRCUITRY EAD WRITE amp ERASE HEADS R R R R EAD WRIT 6 E I RASE HEAD CLEANING amp DEMAGNE TIZATION RF SHIELD ROM SCHEMATIC REA SCHEMATIC SID R BOARD E BOARD 10 4 2 12 2 4 9 9 2 10 12 6 18 19 37 38 2423 24 4 6 6 21 31 2 11 12 2 11 12 2 7 8 1 6 12 48 6 8 52 2 6 2 4 20 2 9 2 15 6 13 46 4 1 5 2 7 6 26 2 13 2 22 2 4 21 1 3 6 10 51 2 7 3 7 9 6 3 5 9 4 IND A108 VOLTAGE REGULATOR ADJUSTMENTS ALIGNMENTS APPENDIX BASEPLATE BLOCK DIAGRAM BOOTING TEST BUSY LITE CARRIER ASSEMBLY CASE DISK DRIVE 5 PATTERN CLEANING PROCEDURE CLOCK CIRCUITRY COME ATABILITY TEST CYCLIC REDUNDANCY CHECKS DATA GATE DATA I O amp MANIPULATION DATA INTERFACE
34. ct the Drive to the Computer Console Turn the Drive on and wait for the BUSY lite to go Off Insert the master alignment diskette Either insert the disk alignment cartridge or load the disk alignment program into the Console Via the console command the Drive to read track 00 Setscrew Locate the track 00 stop setscrew at the rear of the Drive transport 0 010 CLEARANCE AT TRACK 20 SETSCREW Check and adjust as needed for a 0 010 inch clearance between the setscrew and the rear corner of the head carriage plastic molding Co amp and the Drive to step out to any track above 30 and then return to track 00 Verify that upon returning to and reading track 00 the carriage does not butt against the setscrew DRIVE BELT ADJUSTMENT Drive belt adjustments are completed with NO power applied to the unit The transport will have either the older yellow mylar drive belt or the newer black neoprene drive belt Proper adjustment of the mylar belt requires the use of a tensiometer or suitable substitute capable of measuring 17 1 g rams MYLAR YELLOW DRIVE UJ ELT 1 Loosen but do not remove the two screws securing the drive motor to the transport casting Drive Motor Screws PARFS LISTS ITEM NO 10 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 PART 6014757 C014758 02 C014758 01 6015200 014763 CA0
35. e BOOTING TEST 1 Insert Master Disk File Manager diskette into the Drive and close the Drive s door 2 Turn the Console OFF then ON Verify that data is transferred from the diskette to the Console RAM turn up the TV sound and listen for the buzz buzz buzz etc this should take about 10 seconds When completed the TV screen should display the word READY 34 If the TV displays any ERRORS or does not show READY very shortly repeat step 2 If the system still will not BOOT UP recheck your an Console Drive system and hookup for misconnections n2 or gross equipment failures If none are found and the system continues to ERROR refer to the Troubleshooting ide in this manual When the system has booted a type DOS Disk Operating System b press the RETURN key Verify that the DOS menu appears on the TV screen Refer to the Troubleshooting Guide if you encounter ERROR on the TV screen WRITE PROTECT TEST This test must be completed with the write protect ed Master diskette installed The TV screen should be displaying the DOS menu from the Booting Test At the Console a type I capital letter b press RETURN e type 1 number one d press RETURN type Y press RETURN Verify that the TV screen displays ERROR 144 If it does the write protect circuit is operating correctly go on to step 3 If i
36. e Erase Head creates these guardbands It straddles the Read Write Head in such a way that just after 036 the data is written onto the diskett th Erase Head tunnel erases the track width down to 012 leaving 008 guardbands between tracks READ OPERATION 5 During a read operation the very small fields existing due to particle alignment on the diskette couple through the head core halves The diskette is rotating causing the specific field being felt in the core halves to change for each change in particle alignment ie change of corded logic level The changing fields in the core halves generate corresponding currents in the head coil windings It is these very small signals that are applied to the differential amplifier DISKETTE FORMATTING The specific arrangement of information recorded onto a diskette is called the diskette format Unless a Master Diskette is to be used the diskette must be initially formatted with a Disk Operating System DOS software program The DOS software divides the diskette into 19 pie shaped slices 18 of which are called sectors These are not the same as the 709 FREE SECTORS referred to when you list the directory of a disk Because the diskett division is accomplished totally through software this process is called soft sectoring The 18 sectors are equal in size but the 19th very narro
37. e loads its directory listing into the Console The directory should appear on the TV screen 8 Choose a program You wish to load At the Console press RETURN type B press RETURN type LOAD D NAME OF PROGRAM S gt D press RETURN Verify that the Drive s BUSY lite comes on as the Drive loads the selected program After several seconds the word READY should appear at the top of the screen If not refer to the Troubleshooting Guide At the Console a type RUN b press RETURN Verify that the selected program runs correctly If it ERRORs refer to the Troubleshooting Guide ROUBLESHOOTING 1 DRIVE WILL NOT TURN ON 2 DRIVE WILL TURN OFF 3 DISKETTE DOES NOT TURN DEFECTIVE TRANSFORMER ELECTRICAL MALFUNC TION POWER SWITCH SIDE PCB POWER SUP PLY REAR PCB DEFECTIVE SIDE AND OR REAR PCB DRIVE BELT HAS FALLEN OFF FLYWHEEL PULLEY OR IS BROKEN DRIVE MOTOR DEFECT V E CLUTCH CONE NOT CLAMPING DISKETTE ELECTRICAL MALFUNC TION DRIVE MOTOR CIRCUIT REAR PCB REPLACE TRANSFORMER REPLACE AND OR REPLACE OR REPAIR PCBS REPOSITION OR REPLACE DRIVE BELT REPLACE DRIVE MOTOR ADJUST OR REPLACE CLUTCH CONE ASSEMBLY REPLACE AND OR TROUBLESHOOT PCB 4 5 SYMPTOM DISKETTE SPEED SLOW OR WARY ING DISKETTE WONT EJEECOT WN EINE ROR DO DCOR 1 OPENED
38. e top side of the casting The motor s wiring harness should exit the motor toward the center rear of the transport 3 While supporting the motor with one hand install the two screws splitring lockwashers and flatwashers to secure the motor to the transport 4 Torque the two screws to 10 inch lbs 55 Attach the drive belt to the transport INSTALLING THE TRANSPORT DRIVE BELT Lay the transport on itss ide 2 Loop the drive belt over the drive motor drive hub Carefully ease the belt onto the flywheel while rotating the flywheel NOTE DO NOT stretch or damage the drive belt It is primarily responsible for diskette speed and any variations in diskette speed caused by a stretched or damaged drive belt can cause errors during read and write operations 3 Refer to the adjustments section of this manual and complete the drive belt adjustment 4 Attach the transport to the common baseplate INSTALLING Common 0113 TRANSISTOR A108 VOLTAGE REGULATOR Screw Bend Device Shoulder Leads 90 Up Washer Baseplate Insulating 2 Plate Apply Heat Splitring Transfer Cpd 7 Lockwasher Hexnut 1 Bend the leads of the device you are about to install as shown above 2 If you are installing Q113 transistor a Apply heat transfer compound to both sides of the mica insulating plate Place the insulating plate into location on the common baseplate Place
39. el is topped with a rubber isolation washer 25 Position the front coverplate onto the baseplate transport PCB assembly 3 Carefully lower the baseplate into position in the Drive base ensuring that the cover plate is also correctly positioned in the base 6 54 Install and tighten the five screws 6 1 2 PHIL HD securing the common baseplate to the Drive base Refer to the adjustments section of this manual and complete the head cleaning and demagnetization procedure Refer to the adjustments section of this manual and complete the radial track align ment speed control adjustment and track 00 end stop adjustment Reassemble the Drive case ASSEMBLING THE DRIVE CASE 1 Carefully position the tophousing onto the base and coverplate Install and tighten the four screws 6 3 4 SHTMTL PHIL HD securing the tophousing to the coverplate Install the screw hole covers Refer to the final checkout section of this manual and complete the full checkout procedure for the Drive ADJUSTMENTS READ WR ITE amp ERASE HEAD CLEANING amp DEMAGNETIZATION Both the head and the pressure pad will accumulate dirt and oxide particles during use Periodic cleaning and inspection is necessary for proper Disk Drive operation CAUTIONS The head is subject to magnetization from external fields DO NOT use magnetized tools or allow the head to get near any equipment producing strong magnetic fie
40. enting the diskette from being jected Test th jection process using a standard diskette Retaining Ql 3 10 Flatwasher 5 as many needed TI To adjust the clearance compress the clutch cone into the doorarm forcing the clutch cone shaft up out of the top of the carrier assembly 125 Locate and remove the retaining clip from the shaft 135 Place another flatwasher over the shaft and replace the retaining clip 14 Release the clutch cone and return to step 10 15 16 17 18 19 20 21 BLOCK LATCH LEVER LEVER LIFTING eT ARM A r A DISKETTE N EJEET BLOCK With the carrier assembly open push the diskette eject block right rear corner until it latches into its rear position under the latch lever Close the carrier assembly and then press the release button to reopen the door Check to see that the diskette eject block freely returned to its forward position when the carrier assembly opened If the block did not return bend either the latching lever or the lever lifting arm to adjust the mechanism Repeat steps i5 thru 18 until the diskette eject mechanism works indicated If necessary install the drive belt Attach the transport to the common baseplate 6 43 INSTALLING THE RIVE MOTOR NO 9 N 1 the Drive transport on its side 24 Position the drive motor onto th
41. ently lift the head assembly carriage and guiderods away from the casting You will have to feed the head I O cable through the casting atthe same time CAUTION The head is subject to external magnetic fields DO NOT use magnetized tools or allow the head to get near any equipment producing strong magnetic fields 13 Slide the quiderods Out of the carriage REMOVING THE STEPPER MOTOR js Disassemble the Disk Drive case Remove the common baseplate from the Drive case 3 Remove the Drive transport from the common baseplate 4 Locate the two screws securing the stepper rotor positioning band to the right side of the head assembly a Remove the rear screw being very careful not to crimp or damage the band and noting the screw and washer arrangement b Slide the head assembly carriage forward enough to allow you to remove the front band screw Remove the front screw again noting the screw and washer arrangement NOTE The stepper motor positioning band is very delicate and very important to the operation of the Drive DO NOT kink or damage the band in any way 5 Locate the allen head setscrew securing the head position ing strap pulley to the stepper motor drive shaft topside of casting 6 Back the setscrew out about 1 turn counterclockwise Setscrev Securing Nuts 7 Remove the band pulley from the stepper motor shaft set it aside 8 Locate the two nuts securing the step
42. ith a centertapped coil The centertap is connected to the regulated 5 VDC from the Power Supply One end of the coil is connected to the High level Driver and the other end to the Low level Driver WRITE OPERATION Each logic level causes current to flow in one half of the coil with a high in one direction and a low in the other These currents set up corresponding magnetic fields in the core halves with a hidh rep resented by a field in one direction and a low by a field in the opposite direction When the ferric oxide coating on the diskette is in contact with the head it completes thr magnetic path between the core halves In response to the change in direction of the magnetic field logic level change passing through the diskette s coating the oxide particles realign themselves Particle alignment in one direction represents a high level and alignment in the other direction a low level ERASE HEAD GAPS STRADDLES TRACK READ WRITE HEAD 013 14 TRIM ERASED TO 012 GUARDBAND nan J TRACK 13 DISK ROTATION During a write operation the magnetic fields coupling through the diskette print a relatively wide 013 path of aligned particles In order to prevent one recorded track from interfering with either the next inner or next outer track a blank space called a guardband is created between tracks Th
43. l lt Screw 2 From the top side of the casting insert the diskette drive spindle into the shoulder bearings 3 Assemble the necessary combination of washers along with the flywheel and screw See the illustration for the flywheel casting spindle relationship The specific number and placement of the washers is very important and helps to determine diskette speed during operation 6 37 6 Screw From the bottom side of the casting position the flywheel screw and washer combination overthe bottom of the spindle shaft Screw the assembly together Torque the screw to 6 inch lbs Rotate the flywheel and check for wobble runout or binding of either the flywheel or drive spindle Adjust the assembly as necessary Attach the carrier assembly to the transport INSTALLING THE CARRIER ASSEMBLY CAUTIONS This procedure requires that you lift the head assembly pressure pad arm in order to position its lift arm onto the carrier assembly DO NOT lift the pressure pad higher than it would be lifted by the carrier assembly during normal operations Lifting the pad arm too far will distort its pressure spring changing the pad s loading effect on the head The head is subject to magnetization from external fields DO NOT use magnetized tools or allow the head to qct near any equipment prbducing strong magnetic fields 1 Ensure that the transport front panel bezel is tilted fo
44. lds DO NOT lift the pressure pad arm farther from the head carriage than the arm would be lifted during normal Disk Drive operations ie front door open Pressure Pressure Pad Pad Arm Pressure Spring READ WRITE AND ERASE Head Head T Carriage Assembly 1 Use a small mirror to inspect the pressure pad for excessive buildup of oxides and dirt or for excessive wear Replace the head if it is worn or damaged 2 Otherwise clean the head NOTE Use either a cotton swab preferred or a lint free cloth ie chamois moistened with either methyl or high quality 31 isopropyl alcohol Wipe the head carefully to remove all accumulated oxide and dirt Dry the head CAUTION DO NOT use carbon tetrachloride as a cleaning solution for the head 7 3 To demagnetize the head hold the energized demagnetizing tool about 6 inches above the head Slowly lower the tool toward the head ina spiraling motDDoNOT allow the tool to come into contact with the head DEMAGNITIZER Reverse the procedure as you lift the tool away from the head DO NOT turn the tool off until it is at least 6 inches away from the head RADIAL TRACK ALIGNMENT amp SPEED ADJUSTMENT Radial track alignment and speed adjustment is necessary to provide optimum diskette compatability between Drives The following are required to perform this procedure A Oscilloscope dual trace with A B function
45. lift the baseplate from the base the front coverplate will lift out atthe same time Remove the coverplate from the baseplate and set it aside 6 Place the baseplate on a suitable static protected work surface REMOVING THE SIDE PCB 13 Disassemble the Disk Drive case 25 Remove the common baseplate from the Drive base REEN ara E 6 A lt RED 7 WRITE PROTECT 3 Locate and disconnect the write protect wiring harness nonpolarized black green blank red black from the side PCB 4 Locate and disconnect the stepper motor wiring harness nonpolarized black white red green brown from the side MOTE See Appendix for alternate wiring harness arrangement 6 8 5 Locate and remove the three screws securing the side PCB and its center ground bracket to the common baseplate 6 Grasp the side PCB at both its front edge its upper rear corner Lift the PCB straight up to disengage its rear jack from the row of pins on the rear PCB NOTE You may have to rock the PC B slightly to overcome the jack to pin tension between the two PCBs 7 Place the side PCB on a static protected work surface 6 9 REMOVING THE RF SHIELD 5 PCB Disassemble the Disk Drive case Remove the common baseplate from the Drive base Remove the side PCB from the common baseplate Bw MH Locate and carefully straighten the three tabs
46. nough to disengage the board s two right side jacks from the six device pins NOTE You may have to rock the PCB slightly to overcome the jack to pin tension between the PCB and the pins attached to the common baseplate 6 Lift the rear PCB away from the baseplate and place it on a suitable work surface Disassemble the Disk Drive case Remove the commor plate from the Drive base Remove the side j from the common baseplate Remove t h erearP 5 fromthe common baseplate Q W N Locate and remove the single screw securing the device either transistor 0113 or voltage regulator Al08 to the common baseplate E SCREW e APPLY HEAT TRANSFER d 726 227 COMPOUND e COMMON 5 BASEPLATE ee ol NOTE Ii you are removing 0113 you should find an insulating plate between the back of the device and the common baseplate Also both 0113 and Al08 use the common baseplate as a heatsink Each device 0113 5 insulating plate should be coated with heat transfer com pound 6 Lift the device 0113 or A108 from the baseplate and set aside REMOVING THE TRANSPORT DRIVE BELT 1 Disassemble the Disk Drive case 2 Remove the common baseplate from the Drive base 9 Remove the Drive transport from the common baseplate 4 Carefully lay the transport on its side 55 Locate and remove the drive belt Drive Belt Flywheel
47. o Axis Crossing Detector provides a single output further squared and now without any signal decay effects The Time Domain Filter provides a signal with very sharp leading and trailing edges The Pulse Regenerator converts each logic level change into a single pulse recreating the original signal produced by the FDC during the write operation CLOCK I MHz TO PIA DATA TIMING TIME DOMAIN FILTER Bus FLOPPY CONTROLLER ADORESS STATUS RESET REAO WRITE HEAD DATA INTERFACE SECTION The Drive s Write Protect circuit senses the presence or absence of a special notch in one side of the diskette casing A write protected diskette s notch will be covered with an opaque tape The circuit is basically an LED photo transistor sensor whose output is buf fered before being applied to the FDC With an unprotected diskette the sensor signal allows the FDC to write data onto the diskette 2 16 CONTROL LINES FROM PIA STEPPER MOTOR 9 10 VAG STEPPER MOTOR AND LOGIC The Stepper Motor is a four phase motor with 3 69 rotor rotation per step The motor has a total of 100 poles providing 100 rotor steps for the motor s full 360 rotation Each step change in the motor is traffslated through a steel band connection to a single track change for the Read Write and Record Bead assembly The diskette is divided into 40
48. o form a serial signal The Data Gate converts each pulse s lending edge into a logic level change as shown this is the signal applied to the head during a write The high levels out of the Data Gate turn on the High and the low levels turn an the Low level Driver WAITE PROTECT PULSE REGEN ERATOA ZERO CROSSING DEFECIOR OIFFERENTIATOR Low LEVEL DRIVE HI LEV DRI WHITE DRIVE ERASE ERASE WRITE ORIVER Eao SECTION Erase Gate turns on both the Write and during a write operation and turns them The drives See the Read Erase Driver Erase Head discussion for further information 2 12 CLOCK time WRITE PROTECT mask 1 Time p See 4 Doman F lt 2 ERATOR FILTER STATUS p SYMMETRY RESET DIF FERENTIATOR IRO CROSSING OIF FERENTIAL DETECTOR DATA INTERFACE SECTION Major elements of the Drive s Read Data Conditioning circuitry are Differential Amp Initial amplification of Read Write Head signals Differentiator Squaring up the two differ ential amp outputs Zero Crossing Detector The single output changes level whenever the two 1805 out of phase input signals cross their zero axis coincidentally eliminates false pulses caused by Read Write Head signal decay rather than intentional signal level changes
49. our full turns 8 Remove the two top screws 9 Push the door release button at the front of the transport to disengage the carrier assembly from the door latch Lift the assembly far enough to clear the latch mechanism and release the button Lower the door to a resting position Carrier Assembly Pressure Pad Arm 10 Now completely remove the two screws at the rear of the transport casting 11 Pull the top of the front panel bezel forward 12 Carefully lift the carrier assembly out of the transport CAUTION You will have to tilt the carrier assembly slightly to clear the head assembly s pressure pad arm DO NOT by the door arm during normal Drive operation Lifting the pad arm too far will distort its pressure spring changing the pressure pad s loading effect on the head REMOVING TH 3 gt n NSP I DRT FLYWH EL DRIVE SPINDLI Gl Disassemble the Disk Drive case Remove the common baseplate from the Drive base Remove the Drive transport from the common baseplate Remove the drive belt from the transport Remove the carrier assembly from the transport C 5 c N Carefully lay the transport on its side Screw 78 Locate the single screw in the center of the flywheel Holding the flywheel with one hand remove the screw NOTE See the following illustration of the flywheel casting spindle relationshi
50. p specific number and placement of the washers is very important y 4 helps to determine diskette speed during operation DO NOT lose any of the washers you remove during this step Diskette 1 7 REG di lt Upper ees Spindle Shaft Bearing Sc Drive Transport Casting Flat d Spacer Washers Washer Splitring Flywheel Lockwashers Screw 8 Being very Careful not to lose any washers hold the drive spindle with one hand and carefully pull the flywheel away from the casting with the other hand 9 Pull the spindle from the casting 6 19 11 I ING THETRANSPORT SPINDLE SHAFT BEARINGS o Co gt Disassemble the Disk Remove the common baseplate from the Drive base Remove the Drive trans vort from the common baseplate Remove the drive belt from the transport Remove the carrier assembl from the transport Remove the flywheel and drive spindle from the transport Upper Spindle Shaft Bearing Casting Bore Lower The top spindle shaft bearing may have lifted from the casting when you removed the drive spindle If it did not very carefully pry the bearing out of the casting Very carefully push the bottom bearing out of the casting push from the top side of the casting being very careful not to damage the casting bore REMOV
51. per motor to the casting 9 Lay the casting on its left side 10 While supporting the stepper motor with your right hand remove the two securing nuts 11 Carefully separate the motor from the chassis while pulling the motor wiring harness out of its chassis slot REASSEMBLY STEPPER HEAD MOTOR ASSEMBLY Locate the beginning point of your reassembly the order instructions shown BEARINGS FLYWHEEL CARRIER ASSEMBLY and follow called out ane in this flow chart in the PCB COMMON BASEPLATE NOD DACIA CLEAN MEAD A alen SPEED N 04 c7 STOP ADJ 6 26 RF sit ELD ca 125 INSTALLING THE STEPPER MOTOR 1 installa split rubber grommet on the stepper motor wiring harness 25 Lay the transport on its left side cn Position the stepper motor to the underside of the transport casting The motor s wiring harness should lie toward the rear center of the casting CAUTION The head is subject to magnetization from external fields woT use magnetized tools or allow the head to get near any equipment producing strong magnetic fields 6 27 Install a flatwasher a splitring lockwasher and a 1 4 hexnut onto each of the two stepper motor stud bolts projecting through the top of the casting Lightly tighten the nuts SECURING NUTS Carefully install the head positioning band pulley onto the stepper motor drive shaft projec
52. rness up through the rectangular hole at the right rear corner of the transport casting Center front to back the two head assembly guiderods in their transport casting slots Position the two guiderod clamps onto the casting over the ends of the guiderods Install but do not tighten the front clamp Screw including a splitrinq lockwasher Install but do not tighten the rear clamp Screw including two male faston terminals and splitrinq lockwasher Tighten the two clamp screws to 10 incti lbs torque 6 33 10 AE 12 13 14 15 16 Carefully position the head assembly so that you can connect the positioning band to the assembly s right rear corner Install but do not tighten the rear screw splitring lockwasher and special bracket washer to hold the rear section of the positioning band to the head assembly Carefully pull the front section of the positioning band forward until its screw hole is located over the matching screw hole on the front corner of the head assembly Install but do not tighten the screw splitring lockwasher fFlatwasher to secure the band to the head assembly Locate the allen head setscrew securing the positioning band pulley to the stepper motor driveshaft Back the setscrew out counterclockwise about 1 4 turn Gently slide the head assembly back and forth on its quiderods This will center the b
53. rward from both guide assemblies for extra clearance at the top 6 39 Carefully lower the carrier assembly into position over the transport casting Lift the head assembly s pressure pad arm just enough to position it onto its carrier assembly slide area Install and slightly tighten the two screws splitring lockwashers and flatwashers at the rear corners of the carrier assembly 6 40 4 Push the bezel back to its normal position and install the two top screws 5 Tighten the four screws securing the bezel to the transport 6 Latch the carrier assembly closed down at the bezel Door Centered on Panel Opening 7 Horizontally center the door in the door opening of the bezel 8 Tighten 10 inch lbs the two screws secur ing the rear corners of the carrier assembly to the rear of the transport casting 3s Press the front door release button Ensure that the door opens and the carrier assembly lifts the head assembly pressure pad arm 6 41 10 With the door open observe the gap between the top edge of the diskette drive spindle and the bottom edge of the clutch cone assembly e sure a diskette can move in and out without being scratched or pinched NOTE The spindle cone clearance is critical to ensure that the diskette is ejected when opening the front door Too little clearance nay cause the back edge of the cone to catch the edge of the diskette hub hole prev
54. s 4 Locate and bend the three tabs securing the RF shield case halves together 5 Connect the side PCB to the common baseplate 6 51 SIDE PCB I INSTALLING TH 1 Position the side PCB on the common baseplate with rear PCB installed BROWN STEPPER oR 2 Gently seat the multipin socket at the rear lower edge of the side PCB down onto the pins protruding from the rear PCB 2 Install and tighten the three screws 6 32 x 5 16 THD F PHIL HD that secure the side PCB and its ground bracket to the common base plate 6 52 4 Locate and connect the stepper motor wiring harness black white red green brown from the Drive transport to the side PCB nonpolarized 2 5 Locate and connect the write protect wiring harness black green blank red black to the side PCB nonpolarized 1 6 Attach the common baseplate to the Drive base DRIVE WRITE HEAD MOTOR PROTECT 170 fannanl 110080 REAR 00020 sise 2698 26968 GR BLACK HT pd JeLack l TO ITA 3 BLUE CRED GREEN Vee YELLOW EM w ITE E BLACK J HEAD PHASE 21 mere NOTE You may also have this wiring harness arrangement G 53 Gl INSTALLING THE COMMON BASEPLAT Ensure that every boss in the base even those not used to secure the baseplat
55. ss Busses Interpreting and controlling the accomplishment of Console commands temporarily stored in RAM and Disk Drive operating instructions permanently stored in ROM Controlling the Stepper Disk Drive and Motor Logics which are buffered by the PIA The Drive s ROM contains specific operating instructions used by the CPU to accomplish a variety of functions These functions include telling the Disk controller 1771 01 what task to perform The Drive s RAM is used by the CPU for temporary storage of both data and system information 500 RESET I MHz TO ANO FROM DATA INTERFACE SECTION RESET COMMAND IN Gur FER TO STEPPER A m MOTOR LOGIC TO DISKETTE DRIVE out MOTOR LOGIC _ TO AND FROM COMPUTER CONSOLE DATA INPUT OUTPUT AND MANIPULATION SECTION The Drive s Data Output Buffer transfers the formatted data through the PIA to the Data out line going to the Computer Console 2 8 STATUS INFO 500 Kir CLOCK RESET Y on A DATA TIMING TO AND FROM ROM asiani 1 gt INTERFACE i SECTION oa lt STATUS INFO RESET gu RAM TO STEPPER MOTOR LOGIC TO DISKETTE DRIVE MOTOR LOGIC TO AND FROM COMPUTER CONSOLE DATA INPUT OUTPUT AND MANIPULATION SECTION The Drive s Power Up Logic circuit resets the MPU PIA and Data Interface Section whenever
56. t does not a Repeat Step 1 again b If the ERROR 144 still does not appear refer to the Troubleshooting Guide 3 Remove the Master diskette from the Drive FORMATTING TEST CAUTION The formatting operation erases the contents of a diskette This test must be completed with the DOS from the Master diskette still stored in the Console RAM 1 Insert a non write protected scratch diskette into the Drive and close the door At the Console a press SYSTEM RESET b type DOS C press RETURN d type I capital letter e press RETURN f type 1 number one press RETURN h type Y i press RETURN 3 Verify that after about 45 seconds of formatting the Drive s BUSY lite turns OFF and no ERRORS have been displayed on the TV screen refer to the Trouble shooting Guide for any ERRORs 4 At the Console a type A b press RETURN press RETURN 5 Verify that 709 or FREE SECTORS 709 is displayed at bottom of screen If not refer to the Troubleshooting Guide 6 Press RETURN to get back to MENU 4 6 VERIFICATION WRITE This 1 immediately follow the FORMATTING TEST At the Console type Ti b press RETURN type d press RETURN Verify that the TV screen displays SELECT ITEM after a short period of time If it does not refer to the Troubleshooting Guide A
57. t the Console type b press RETURN CA press RETURN Verify that the TV screen displays DOS SYS and number of sectors used followed by the number of sectors remaining If it does not repeat the procedure If the second attempt fails refer to the Troubleshooting Guide c pos SYS number of sectors used number of sectors remaining Jy 6 Del a t At the Console press RETURN type D press RETURN type DOS SYS press RETURN type Y press RETURN After a SELECT ET type A press RETURN press RETURN th fil as follows ITEM appears at the Console Verify that the TV screen indicates that there are 709 free sectors remaining Remove the blank scratch diskette from the Drive 4 8 MPATABILITY TEST This test verifies that the Drive can read programs from a diskette recorded on a known good Drive 1 Insert a sample diskette into the Drive 2 Turn the Console OFF then 3 Verify that after about 10 seconds the TV screen displays READY 4 At the Console a type DOS b press RETURN 5 Verify that the DOS menu appears on the TV Screen indicating that the diskette data was correctly loaded into the Console RAM Refer to the Troubleshooting Guide in case of any ERRORS 6 At the Console a type A b press RETURN c press RETURN 7 Verify that the Drive s BUSY lite comes ON as the Driv
58. the band while tightening the front band retaining screw Slide the wiring harness grommet up into the slot at the rear of the transport casting Attach the transport to the common baseplate Attach the common baseplate to the Drive base CAUTIONS The head is subjectto magnetization from external fields DO NOT use magnetized tools or allow the head to get near any equip ment procucingstrong magnetic fields The head is also damaged by dirt and oils DO NOT touch either the head or the pressure pad with your fingers DO NOT lift the pressure pad arm farther from the head carriage than the arm would be lifted during normal Disk Drive operations Lifting the arm too far will distort its pressure spring changing the arm s loading effect on the head during operation The stepper motor positioning band is delicate and very important to the operation of the Drive DO NOT kink or damage the band in any way 6 31 Slide the two guiderods into the sides of the head assembly carriage Carefully lower the carriage guiderods assembly into position in the transport casting Ensure that the head wiring harness lies down in the underside of the transport Wrap a small piece of masking tape around N the head assembly s wiring harness about 3 from the head Install the nylon cable clamp over the tape and snap the clamp into the hole provided at the back of the casting Feed the wiring ha
59. ting through the top of the casting If the pulley does not easily slip onto the motor shaft back the pulley s allen head setscrew a little farther out of the pulley DO NOTtighten th setscrew at this time NOTE The stepper motor positioning band is delicate and very important to the operation of the Drive DO NOT kink or damage the band in any way 6 28 Special _ Bracket Washer mz ST 1 6 Carefully position the head assembly so that you can connect the positioning band to the assembly s right rear corner 7 Install but do not tighten the rear screw splitring lockwasher and special bracket washer to hold the rear section of the positioning band to the head assembly 8 Carefully pull the front section of the positioning hand forward until its screw hole is located over the matching screw hole on the front corner of the head assembly 9 Install but do not tighten the s rew splitring lockwasher and flatwasher to secure the band to the head assembly 10 Gently slide the head assembly back and forth on its guiderods This will center the band pulley on the stepper motor shaft Ts Tighten the rear band retaining screw CAUTION DO NOT exceed 6 inch lbs torque when tightening screws into plastic parts T2 13 14 15 Use a pointed tool ie X acto knife point etc to hook the small hole on the front end of the positioning band Pull forward slightly on
60. tput data in parallel during a read operation Controlling the Write and Erase Logic circuitry during a write operation Generating the data validity codes called Cyclic Redundancy Checks or CRC s during a write operation and checking them during a read operation CLOCK UI Mitel WRITE DATA T eG peel R G N DATA GATE WRITE AND gt A ERASE T KESET TIME FLOPPY CONTROLLER ZERO CROSSING O TECTOR DATA INTERFACE SECTION The Drive s Write and Erase Logic circuitry is ccntrolled by and receives its data from the FDC Initially the Data Gate converts the leading edge of each pulse data clock etc into a single corresponding change of signed level These levels then determine the polarity of the Drive s currents applied to the Read Write Head through the High and Low level Drives The Write Driver limits the write currents L L CLOCK CLOCK DATA 0 CLOCX DATA Basically operation level Driver CLOCK GQ uma Gala 1 lG bus N 24 inim i 3 a o ALORESS dt ae p S GATE vw PY WRITE ANO 1SIATUS ERASE GATE ESET DATA INTERFACE The Write and Erase Drivers off during a read operation the Write and Erase Head during a write operation The FDC combines clock pulses with data t
61. tracks so the full range of the Stepper Motor is not used The Stepper Logic is controlled from the PIA The four PIA signals are logic levels acting as the Stepper Motor s four phase inputs These levels in their various possible combinations drive the Stepper Motor to reposition the head assembly from track to track The Stepper Motor is supplied with a nominal 3 to 10 VAC from the Power Supply CONTROL SIGNAL FROM PIA MOTOR CURRENT SUPPLY i2VOC FROM POWER SUPPLY DISKETTE DRIVE MOTOR AND LOGIC The Diskette Drive Motor is a DC motor that indirectly drives the diskette The motor includes an internal tachometer whose output is monitored in the Tach Feed back circuit Variations in motor speed as sensed by the Tach Feedback circuit vary the current supplied to the motor Diskette speed is set to 290 RPM 51 Motor rotation is translated into diskette rotation via a pulley attached to the motor shaft a drive belt and a flywheel attached to a diskette drive spindle When a diskette has been inserted into the Disk Drive and the front door has been latched closed the diskett is centered and clamped to theo spindle by a clutching cone assembly Whenever the Diskette Drive Motor is supplied with power the Drive s BUSY lite LED is turned on DISK DRIVE dim ECT DRIVE CODE NO N
62. w slice acts as an index to define the start of each of the 40 tracks SECTOR THE DISK TURNS IN THIS DIRECTION INDEX AREA 256 bytes 00 1 byte FC index mark 11 bytes 00 or FF 6 bytes 00 1 FE 1 byte Track Number 00 thru 27 HEX 1 byte 00 1 byte Sector Number 01 thru 12 HEX 1 byte 00 l byte CRC byte 2 1 byte CRC byte 1 17 bytes 00 or 11 bytes FF 6 bytes 00 1 byte FB data address mark 128 bytes Data FF for blank fill 1 byte CRC byte 2 1 byte CRC byte l 11 bytes 00 or FF Cyclic Redundancy Checks CRCs arc generated in the Drive s Floppy Disk Controller FDC during a write operation The FDC uses the recorded CRCs during a read operation to verify the data CRCs are similar in function to the checksums used between the Computer Console and the Disk Drive s MPU Appear only once per track for indexing m Repeated 18 times per track producing the full 18 sectors BLOCK DIAGRAMS AND SCHEMATICS On the following pages are block diagrams and schematics for the Disk Drive Further understanding of the system s operation can be obtained by comparing these 35 1 1 v i Qv3H 31M Qv 14 20 6 3 31 80123130 WILN3Y3 4412 gt 3019114353319 x WVYSVIG 32018 SAIYG SIG 018 IYVLV

JULY I.980 FSOlSO5i REV. 1

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