Page 1 JULY REV. 1...
Page 2 SPECIFICATIONS THEORY OF OPERATION BLOCK DIAGP&m & SCHEMATICS FLOPPY QUICKCHECK 5 . . GUIDE PARTS LISTS APPENDIX INDEX 10-l...
Page 4 Up to four Drives can.be daisy chained to a single . 3. 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.-...
Page 6 THEORY OF OPERATION The ATARI 400/800 Computer Console with of RAM installed connects directly to the 810 Floppy Disk Drive. The Drive may also daisy chained through up to the 820 Printer 6r the 850 Interface Module. four Disk Drives can be connected to a single Console.
Page 7 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 and Logic...
Page 8 SECTION DATA INPUT/OUTPUT AND MANIPUWTION Data, control commands and a VCC/RDY signal from the Computer Console enter the Disk Drive through cithcr 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 on the 800 I/O lines.
Page 9 The Drive’s PIA is primarily a buffering and signal formatting device, with no decision making or compu- capability. responsible tational following: Applying the Console’s serial outputs to the Busses Data 2nd Address when requested by the Drive’s Microprocessor Unit (NW). Assisting in the control of the Read/Write and Erase fiead position by buffering commands...
Page 10 The MPU rjrovides the.primary decision making and capabilities for the Disk Drive. Drive’s ?:PV is responsible for the following: Controlling data transfers, through its control over the Conmon Data and Address Busses. and controlling the accon,plishment of Console commands (temporarily stored in FLXM) and Disk Drive operating instructions (permanently stored in ROM).
Page 11 The Drive’s Data Output Buffer transfers the formatted data through the PIA to the’Data (out) line going to the Computer Console.
Page 12 The Drive’s Power c’p Logic circuit resets the !&PU, is turned on. The RESET references the electrical circuits to their starting conditions. Additionally, the Power Vp Logic circuit locks the Data Output Buffer off during a short period when the Drive is turned on.
Page 13 DATA INTERFACE SECTION The major element of the Data Interface Section is a Floppy Disk Controller (FDC). The 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 Troviding "he otitput data in parallel during a read qeration.
Page 14 the data validity codes (called Cyclic Redundancy Chpcks - or CXC’s) during a write operation, and checking them during a read operation. The Drive’s Write and Erase Logic circuitry is ccntrolled Initially, Data Gate converts the leading edge of each pulse change of si::ned level.
Page 15 The Data Gate converts ach pulse’s lending edge iilto a logic level change, as shown. Basically, this is the signal applied to the head during a mite level Driver, and fhc low levels turn an the Low level Driver. The Write and Erase Gate turns on both the Write and Erase Drivers during a write oneration, and turns them off during a read operation.
Page 16 Major elements of the Drive’s Read Data Conditioning circuitry are: Amp - Initial amplification Read/Write Head signals. Differentiator - Squaring up the two differ- ential amp outputs. Crossing Detector changes level whenever the two ,180 phase input signals cross their zero axis coincidentally (eliminates false pulses caused by Read/Write Head signal decay, rather than intentional signal level changes).
Page 17 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 origiqal This re- serial string of bits produced by the FIX.
Page 18 operation and amplified hy the The Differentiacor squares the two out-of-phase signals. The Zero 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.
Page 19 Write The Drive’s Protect circuit senses the presence or absence of a special notch in one side of the diskette casing. 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 ser.sor signal allows the FDC to write data onto the diskette.
Page 20 MOTOR STEPPER AND LOGIC The Stc?p~er Motor is a four phase motor with a 3.6" The motor has a total of 100 rotor rotation per step. rotation. Each step change in the motcr is w-a&slated; through a steel band connection, to a single track change far the Read/Write and Record Bead assembly.
Page 21 DISKETTE DRIVE MOTOR AND LOGIC The Diskette Drive Motor is a DC motor that indirectly The motor includes an internal drives the diskette. tachometer, whose output is monitored in the Tach Fced- back circuit.-’Variations in motor speed, as sensed by the Tach Feedback circuit, vary the current supplied Diskette speed is set to 290 RPM *l%.
Page 22 DISK DRIVE SELECT 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.
Page 23 POWER SUPPLY An external step-down transformer is supplied with each Drive. The 120 VAC line Power is dropped to 9 VAC by transformer. This 9 enters the Drive through the 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...
Page 24 READ/WRITE AND ERASE HEADS A magnetic head converts electrical currents into magnetic fields, vice-versa. The Read/Wr’ite Head consists primarily of bo ferrite core halves, wound with a centerta>Ped coil. The centertap is connected to the regulated +5 VDC from the Power One end of the coil is connected to the High level Driver, and the other end to the Low level...
Page 25 TRACK TRACK 1 TRACK 13 During a write operation, the magwtic fields coupling through the diskette print a relatively wide C.013") path of aligned particles. In order to prevent one reco;ded track from interfering with either the next inner or next outer track, a blank space, called a guardband, is created between...
Page 26 DISKETTE FORMATTING The specific arrangement of information recorded onto Unless a a diskette is called the diskette format. Master Diskette j-3 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 These are not 18 of which are called sectors.
Page 27 All 40 tracks receive the same formatting as follows: 2-24...
Page 28 bytes byte FC (index mark) bytes 00 or FF bytes byte Track Number (00 thru 27) (i3E.u) byte Sector Numb’er (01 thru 12) (HEX) byte byte byte CRC byte 2 byte CRC byte 1 bytes b y t e s bytes FB (data address mark) bytes...
Page 30 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.
Page 37 This procedure should he completed both as a pre-service checkout and a final (post-service) checkout for the Disk Drive. As a pre-servjce checkout, it will assist in identifying in the Drive. As a final checkcut, it will ensure that all repairs alignments were successfully completed.
Page 38 The following are required to perform these procedures: Atari 400/800 Computer Console with a BASIC cartridge and minimum 16K RApn. installed. I/O cables and Console/Drive power packs. C. TV. Master Disk File Manager diskette with write protect notch taped. Blank scratch diskette (not write-protected).
Page 39 system and hooku? for misconnections or gross equipment failures.. If none are found and the system continues to ERROR, refer to the Troubleshooting When the system has booted, type DOS (Disk Operating System) press the RETURN key Verify that the DOS nfnu appears on the Refer to the Troubleshooting Guide if you encounter screen.
Page 40 Remove the Master diskette from the Drive. CAUTION: The forxatting operation erases the contents of a diskette. This test’must be completed with the DOS from the 1. Insert a non-write-protected scratch diskette into the Drive and close the door. t h e C o n s o l e : press SYSTEM RESET type DOS...
Page 41 W R I T E V E R I F I C A T I O N immediately TEST. This follow At the Console: press FaTURN type Y press RZT"mi Verify that the TV screen displays SELECT ITEM after a short period of time. If it does not, refer t’o the Troubleshooting Guide.
Page 42 Delete the file as follows: At the Cqnsole: RETURN 1. - press press RETURN type DOS.SYS press RETURN press RETURN ITEM” appears, at After a "SELECT Console: 1 -- press RETURN 3. press RETURN Verify that the TV screen indicates that there are 709 free sectors remaining.
Page 43 TEST This test verifies that the Drive can read programs from s diskette recorded on a known "good" Drive. Insert a sample diskette’into the Drive. Turn the Console OFF, then ON. Verify that after about 10 seconds, the TV screen displays READY. At the Console: type DOS press...
Page 44 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 df the screen. If not, refer to the Troubleshooting Guide. 1.0. At the Console: type RUN press RETURN...
Page 46 D R I V E W I L L N O T DEFECTIVE TRANSFORMER REPLACE TRANSFORMER TURN ON E L E C T R I C A L MALFUNC- REPLACE AND/OR POWER SUP- P L Y / R E A R PC0 D R I V E W I L L N O T D E F E C T I V E SIDE A N D / R E P L A C E O R R E P A I R...
Page 47 SYMPTOM SYMPTOM P O S S I B L E C A U S E P O S S I B L E C A U S E C O R R E C T I V E ACTlON C O R R E C T I V E ACTlON - -.??FE! - -.??FE! D I S K E T T E S P E E D...
Page 48 CCRRCCTIVE ACTION ADJUST OR REPLACE DOOR FRONT DOOR DOOR LATCHING L A T C H MECLiAN i SM WON T OPEN MECHANISM NEEDS A D J U S T M E N T O R I S BROKEN A D J U S T DRtVE M O T O R DRIVE/CONSOLE INCORRECT SPEED...
Page 49 SYMPTOM C O R R E C T I V E A C T I O N REPLACE SPRING OR OVERSTRESSED PRESSURE PAD ARM SPRING H E A D AisEMBLY DRIVE MOTOR SPEED I N N E R TRACKS: ADJUST DRIVE MOTOR SPEED I N C O R R E C T REPLACE AND/OR...
Page 50 E L E C T K I C A L O R ME- E L E C T K I C A L O R ME- CHECK TO ENSURE CHECK TO ENSURE I O . I O . D I S K E T T E D I S K E T T E I S N O T N O T C H A N I C A L M A L F U N C T I O N S...
Page 51 6 - l...
Page 52 The level of Disk Drive disass,embly will vary with the specific problem encountered. Some procedures list steps which are thexselves procedures: ie. "Disassemble the Drive case." When you encounter an underlined step, turn to that procedure first and follow it before proceeding. SPECIAL NOTES Refer to the Disk Drive and 400/800 Operators Manuals for proper Drive setup and operation.
Page 53 Identify the level of disassembly required and complete the sequence of steps indicated above.
Page 54 DISASSEMBLING THE DISK DRIVE CASE WARNING: Unplug the Drive’s AC transformer from AC power With the Disk Drive rightside up on a suitable work surface, .locate and remove the four adhesive screw hole Locate and remove the four screws securing the top- housing to the base.
Page 55 REMOVING TIX CO&WON BASEPLATE N O T E : Removal of either the side PCB, rear PCB or from the Disk Drive base. Disassemble the Disk Drive case. Disconnect the AC transformer power cord from the Disconnectany I/O cables from the I/O CONNECTORS at the rear of the Drive chassis.
Page 56 Note Carefully lift the basep.l.ate from the base. that each of the bosses in the base is topped with a rubber washer. NOTE: As you lift the baseplate from the base, the front same time. Remove the coverplate will lift set it aside.
Page 57 Disassemble the Disk Drive case. Remove the cor?mon baseplate from the Drive base. Locate and disconnect the write protect wiring harness ( nonpolarized - black, green, (blank), red, black) from the side PCB. Locate and disconnect the stepper motor wiring harness (nonpolarized brown) from the side PCB.
Page 58 Locate and LE~OVE the three screws securing the side PCB and its center ground bracket to the common baseplate. Grasp the side PCB at both its front edrje and Lift the PCB straiqht up its upper rear corner. to disengage its rear jack from the row of pins NOTE : You may have to rock the PCB slightly to ~vercane the jack-to-pin tension between the two PCBs.
Page 59 R E M O V I N G T H E S I D E Disassemble the Disk Drive case. Remove the side PCS from the common baseplate. Locate and carefully straighten the three tabs’ securing the RF shield case halves together on the side P6B.
Page 60 the assembly upside down, and place it on a suitable work surface. Locate and remove the four screws that sec& the transport to the baseplate.’ The screws are accessible only from the underside of the bascvlate. CAUTION: The transport provides critical mechanical alignments necessary for proper Disk Drive operatiofi;...
Page 61 REMOVING THE REAR PCB Disassemble the Disk Drive case. Remove the common baseplate from the Drive base. Remove the side PC8 from the common baseplate. 4. Locate and remove the four screws securing the rear PCB to the common baseplate.’ 5.
Page 62 the Disk Drive case. from the Drive base. . +move t h e rear P S .Lron the cannon baswlate. device (either transistor Q113 or voltage regulator BASEPLATE NOTE: Ii you are removing Q113 you.should find an insulating plate between the back of the device and the Also, baseplate.
Page 63 Disassemble the Disk Drive case. Remove tt.6 Drive transport from the so;nnon baseplate. Carefully lay the transport on its side. Locate ana remove the drive belt. NOTE: remove the drive belt without stretching or d a m a g i n g i t , rotate the large flywheel (naked for strobe) while easing the belt off the outside edge of...
Page 64 Disassemble the Disk Drive case. Remove the drive belt from thetransport. Locate and disconnect the single blac!k ground lead coming from the drive motor wiring harness and going While supporting the drive motor with one hand, locate and remove the two screws securing the drive motor the drive motor from the casting.
Page 65 R E M O V I N G T!IE C A R R I E R ASSEMDLY Disassemble the Disk Drive case. Remove the Drive transport from the common baseplate. Locate the’head assembly and slide the assembly all the way to the rear of its travel. Locate and loosen approximately two full turns, but do not remove, the two SCICWS securing the carrier assembly to the rear of the transport casting.
Page 66 Push the door release button at the front of the transport to disengaqc 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. Now completely remove the two screws at the rear of the transport casting.
Page 67 REMOVING THE T?ANSPORT FLYWHEEL/DRIVE SPINDLE Disassemble the Disk Drive case. Remove the common baseplate from the Drive base. Remove the Drive transport from the comma baseplate. Remove the drive belt from the transport. Remove the carrier assembly from the transport. Carefully lay the transport on its side.
Page 68 Diskette Spindle W a s h e r s the drive spindle with one hand and carefully pull the flywheel away from the casting with the other hand. Pull the spindle from the casting. 6-19...
Page 69 SPINDLE SXAFT BEARINGS - the Disk Drive caa . 1. the common basgplate frc!n the Drive base. baseplate. Remove the flywheel and drive spindle from the The top spindle shaft bearing may have lifted from the casting when you removed the drive spindle. If it did nclt, sy carefully pry the bearing out of the’...
Page 70 Nylon Locate the nylon clamp securing the record/playback and erase head I/O wirinq harness to the riqht rear of the casting. Release the clamp from the casting. Push the head.assembly Drive as it will slide. Locate and remove the ground lead (black wire from the drive motor wirinq harness) faston from the rear of the casting.
Page 71 Locate the two screws securing the stepper motor positioning band to the right side of the head assembly. Remove the rear scrw, being wry careful not to crimp or damage the band, and noting the screw and washer arrangement. Slide the head assembly carriaqe forward Remove the front screw, again noting the screw and washer arranqemcnt.
Page 72 Locate the two screws securing carriage clamps and lift the guiderod away the assembly. Carefully pry the two guiderods up out of their locating notches in the drive casting. Gently lift the head assembly carriage and guiderods away from the casting. You will have to feed the same time.
Page 73 Remove the common basexplate from the Drive case. Remove the i>rlve transport from the corcaon baseplate. Locate the two screws securing the stepper rotor positioning band to the right side of the h&d assembly. Remove the rear screw, being very caref,zl not to crimp or.d&xage the band, and noting the screw and washer...
Page 74 ing strap pulley to the stepper motor drive shaft (topside of casting). Back the setscrew out about 1 turn (counterclockwise). Remove the band/pulley from the .stepper motor shaft . .and set it aside. Locate nuts securing the stepper motor to the casting.
Page 75 R E A S S E M B L Y Locate the beginning point of your reassembly, and follow the instructions called out in this flow chart in the order shown. 6-26...
Page 76 Install a split rubber motor wiring harness. Lay the transport on its left side. Position the stepper mqtor to the underside of the tran*pcxt 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.
Page 77 Install a flatwasher, and a l/4" hexnut onto each of the two stepper motor stud bolts projecting through the top of the casting. Carefully install the head positioning band pulley onto ’the stepper motor drive shaft (projecting through the top of the casting).
Page 78 Carefully position the head assembly, so that you ca connect the positioning band to the assembly’s right rear corner. but do not tighten, the rear screw, washer to hold the Rena section of the positioning band to the head assembly. Carefully pull the front section of the positioning hand forward until its screw hole is located over the matching screw !lole on...
Page 79 Use a pointed tool (i.e. X-act0 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. Slide the wiring harness’ grommet up into the slot at the rear of the transport castinq.
Page 80 i s s u b j e c t t o m a g n e t i z a t i o n CAUTIONS: T h e h e a d from external fields. NOT use magndtizfd tools or allow the head to get near sny equip- m e n t prac:ucing s t r o n g m a g n e t i c f i e l d s .
Page 81 Slide the two guiderods into the sides of the head assembly carriage. Carefully lower the carriage/quiderods assembly into position in the transport casting. Ensure that the head wiring harness lies down in the underside of the transport. small piece of maskinq tape around the head assembly’s wiring harness, about clamp over the tape and snap the clamp into the hole provided at the back of the castinq.
Page 82 Center (front-to-back) the two hEad assembly guiderods in their transport casting slots. Position the two guiderod clar;ps onto the casting, over the ends of the guiderods. Install, but do not tighten, the front clamp screw including a splitrinq lockwasher. clamp Install, but do not tighten, .the rear screw including two male faston terminals and a splitrinq lockwasher.
Page 83 Carefully position the head assembly so that you can connect the positioning band to the right rear corner. Install, but do not tiqhten, the rear screw, splitring lockwasher, and special bracket washer to hold the rear section of the positioning band to the head assenbly. Carefully pull the front section of the positioning band forward until its screw hole is located over the matching screw hole on...
Page 84 Use a pointed tool (ie. X-acto knife point, etc.) to hook the small hole on the front end of the positioning band. slightly on the band while tightening The front band retaininq screw. Attach the black ground lead (drive motor wiring harness) to one of the faston lugs at the rear of the transport.
Page 85 INSTALLING TRANSPORT SPINDLE SHAFT BEARINGS Gently insert either the top or bottomcor 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...
Page 86 Lay the transport casting on its side. Diskette Spindle Flywheel- From the top side of the casting, insert the diskette drive spindle into the shoulder bearings. Assemble the necessary combination of washers along with the flywheel and screw. See the illustration for the flywheel/casting/spindle relationship.
Page 87 flywheel, screw and washer combination of the spindle shaft. screw assembly together. Torque the screw to 6 inch lbs.. Rotate the flywheel and ch&!< for wobble, drive spindle. Adjust the assembly as necessary. 6. Attach the carrier assembly to the transport. 6-38...
Page 88 INSTALLING T’:Z CARRIER This procedure requires that you lift the head assembly pressure pad arm in order to pdsition its lift arm onto the carrier assembly. lift thc.pressure pad higher than it would be lifted by the carrier asseriDly Lifting the pad arm during normal operations.
Page 89 Carefully lower the carrier assembly into Lift position over the transport casting. 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.
Page 90 and install the two top screws. Tighten the four screws securing the bezel to the transport. Latch the carrier assembly closed (down) at the beze.1. Door Centered Panel Opening Horizontally center the door in the door opening of the bezel. to the rear of the trsnspbrt casting.
Page 91 10. With the door open, observe the gap between the B e sure bottom edge of the clutch cone assembly. a diskette can move in arid out without being scratched’or pinched. NOTE : The spindle/cone clearance is critical to ensur& that the diskette is ejected when opening the front door.
Page 92 With the cai-rier assembly open, push the diskette eject block (right rfar corner) until it latches into its rear position under the latch lever. release button to reopen the door.’ freely returned tc 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.
Page 93 INSTALLING THE "RIVE MOTOR - - . Lay the Drive transport on its side. Position the drive motor onto the top side of the casting. The motor’s wiring harness should exit the notor toward the center rear of the transport. While supporting the motor with one hand, install the two screws, splitrrng lockwashers, and flatwashers to &?cure the motor tO the...
Page 94 L a y t h e t r a n s p o r t o n i t s s i d e . Loop the drive belt over the drive motor drive hub. Carefully ease the belt onto the flywheel while rotatinq the flywheel.
Page 95 Bend Device Lockwasher Transfer Cpd. Bend the leads of the device you are about to install as shown above. If you are installing Q113(transistor): Apply heat transfer con;mund to both sides of the mica insulating plate. Place the insulating plate into location on the common baseplate.
Page 96 If you are installing A108(voltage regulator): Apply heat transfer compound to the back of the voltage reql1ator. Position the regulator onto the common baseplate. Secure the device to the baseplate with a #4 x l/4 THD F PFiIL HD. screw.
Page 97 INSTALLING THE REAX PCB Carefully lower the rear PC8 into position Ensure that the on the common baseplate. six device legs at the right side of the baseplate are correctly seated into the two three-pin sockets on the PCB. Install and tighten the four screws(#6-32 x to secure the PCB to the baseplate.
Page 98 CAUTION: The transport provides critical mechanical alignments necessary for proper Disk Drive operation. assemblies and components. Carefully set the transport upside down on a s u i t a b l e w o r k s u r f a c e . of the transport.
Page 99 Locate connect erase head I/O wiring harness (shielded- blue red, (blank), and either white, black or black, white) to the r&r PCS (nonpolarized, X4). Locate and connect the drive motor/ground wiring harness (yellow, green, blue, red, black) to the rear PC8 (nonpolarized, If you removed the side PCB, follow the procedures to attach the PCB to the common baseplate.
Page 100 INSTALLING Tlii: RF SIIIl?T,L) (SIDE PCB) CAUTION: Excessive handling of the locating tabs on the shield case will break them. DO NOT bend the tabs anymore than absolutely riecrssary. Carefully psition the case halves on& the side PCB. Position the ground bracket onto the side PCB. bracket to the and case halves.
Page 101 INSTALLING THE SIDE PCB Position the side PCB on the common baseplate (with rear PCB installed). Gently seat the multipin socket at the rear lower edge of the side PCB down onto the pins protruding from the rear PCB. Install and tighten the three screws (116-32 x and its qjround bracket to the common base- plate.
Page 102 Locate and connect the stepper motor wiring harness (black, white, red, green, brown) from the Drive transport to the side PCB (nonpolarized, Locate and connect the write protect wiring harness (black, grwn, (blank), red, black) to the side NOTE: You may also have this wiring harness arrangement. G-53...
Page 103 Ensure that every boss in the base (even those not used to sfcwe the baseplate1 is topped with a rubber isolation washer. Position. the front coverplate onto the assembly. Carefully lower the baseplate into position in the Drive base, ensuring that the cover-plate is also correctly positioned in the base.
Page 104 Install and tighten the five screws (6 - l/2" PHIL HD.) securing the common baseplate to the Drive base. Refer to the adjustments section of thj.s manual and complete the head cleaning and demagnetizntion procedure. Refer to the adjustments sectlonCof this manual and complete the radial track aliqn-...
Page 105 A S S E M B L I N G T H E D R I V E C A S E Carefully position the tophousing onto the base and coverplate. Install and tighten the four scrcwz (#6 - 3/V PHIL HD.) sqcuring the tophousing to the coverplate.
Page 107 dirt and oxide partjcles durinq use. Periodic operation. CAUTIONS: The head is subject to maqnetizatio~ NOT’ from external fields. use magnetized tools or allow the head to get near any equipment producing strong mignetic fields. DO NOT lift the pressure pad arm farther from the head carriage than the arm would be lifted during normal Dj.sk Drive cperztions tie.
Page 108 demagnetize the head, hold the energized demagnetizing tool inches above the head. Slowly lower the tool toward the head in a s p i r a l i n g m o t i o n . DO NOT allow the tool to come into contact with the head.
Page 109 Drives. The following are required to perform this procedure: Oscilloscope, dual trace with A+B function, and B invert function, with two probes. Atari Computer Console with minimum I/O cables and Console/Drive power packs. Alignment Disk Cartridge or Program.
Page 110 Connect the Drive to the Computer Console. Turn the Drive on and wait for the BUSY lite to go off. Insert the master alignment diskette. alignment Either insert the disk cartridge or load the disk alignment program into the Console. Via the Console, command the Drive to read track -16.
Page 111 FIG A CAT’S-EYE PATTERN The ’scope should be displaying a repeating cat’s-eye lobe pattern as shown above. If the lobes are of equal amplitude, go on to step 11. If the lobes are of unequal amplitudes, proceed as follows: Locate the setscrew securing the stepper motor positioning band pulley to the stepper motor shaft.
Page 112 the Console, command the Drive to track 16. TRACK16 T O ’ TRACK 17 -1 mil off track 16 track 16 -2 mil off track 16 track 16 -3 rnil off track 16 DISPLAY AS "Cat’s Eyes" FUNCTION READ HEAD to TRACX 16 DOSITION 7 -.
Page 113 80% amplitude of each other. If they Steps G thru 3 check the hysteristis within the hear1 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;...
Page 114 the Drive to read any track. Refer to the following guide for correct tachometer frequencies. If the tested fre- S P E E D A D J U S T M E N T G U I D E D R I V E M O T O R DRIVE TACH 1 CYCLE...
Page 115 TRACK STOP The following are required to perform this procedure: Atari 400/800 Computer Console with minimum installed. I/O cables and Console/Drive power packs. Disk Alignment Cartr-idqe (Console) or Disk Alignment Program. Master Alignment Diskette. 0.050 hex setscrew driver. 0.010 inch flat or round feeler gage.
Page 116 Locate the track 00 stop setscrew at the ’rear of the Drive transport. 0.010” CLEARANCE AT TRACK .‘2ti 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&and the Drive to step out to any track above 30, and then return to track 00.
Page 117 Drive belt adjustments are completed with No power applied to the unit. The transport will have either the older (ycllbw) mylar drive belt or the newer (black) neoprene drive belt. Proper adjustment of the mylar belt requires the USC of a tfnsiometer or suitable substitute capable of measuring 17 + 1 g-rams.
Page 119 R E Q U I R E D I T E M PART VERSION c o 1 4 7 5 7 PRODUCT CARTON END CAP END CAP C O 1 5 2 0 0 DOS/FILE MGR. C O 1 4 7 6 3 INSERT C A 0 1 4 7 4 8 POWER ADAPTER (PKG’D)
Page 120 QTY. REQUIREI ITEM PART PER VERSION DESCRIPTION CO12976 DISC PANEL, PRIMARY CO14026 MOUNTING PLATE ASSY. LOCKWASHER 75-046 DISK DRIVE SCREW #6-32X1/4 PHIL.HD. SCREW #4-40X3/8 PHIL.HD. SCREW #4X1/4 THD.FRM.pHIL.HD. WASHER, SHOULDER CO14814 C O 1 4 8 1 1 INSULATOR NUT #4 75-914c CA014833 ASSY...
Page 121 QTY. RLQUIRED PER "ERSlOS SCREW #G-3/4 SHEETM.P.H:PHIL. CA014122 CABLE ASSY. (13 PIN) CABLE SUB-ASSY. CA014121 CO11506 SHIPPING LABEL CO14845 WARRANTY CARD CA015303 77 * co15304 RETAILER WARRANTY CARD c o 1 5 3 0 5 POLY CKVELOPE PUBLICATIONS QUESTIONNAIR CO15936 SERVICE CENTER LIST PACKET SOURCE: CA014139-LX...
Page 122 ITEM PART DESCRIPTION , Cl22 COG, Cl41 ’1 CO14369 14-5151 14-5221 220 chn, 1/4w, x, R103, 270 oh, l/iU, 5%. FJ20.126 14-5331 330 chn, l/0; 5%; Rl32’ 14-5471 14-5152 14-5332 14-5472 14-5562 14-5153 14-5273 14-5333 14-5393 14-5473 2’ CO14702 INDUCTOR: 47Ouh, LlOl CO14384 BOARD SOURCE:...
Page 123 DESCRIPTION DIODE: lN4001, CRlOl-104 ,106 DIODE, 2ENF.R: n523za, 5.1~: 52, CR107 co14394 CO14316 CRYSTAL" 1.000000 nhz, X101 SOCKET, IC: 24 PIN SOCKET, XC: 28 PIN ’SOCKET, IC: 14 PIN WITCH, POXER, SlO2 CO14024 co14379 CA.015325 810 SIDE HOARD...
Page 124 DESCRIPTION 21-101474 co10394 ,158 CO14392 CO14368 RADIAL, c15o,l51 co14780 100 ohn, l/4:;, 14-5101 14-5241 ohm, 1/4W, 5%, !U8 14-5331 ohm, 1/4U, 5%, R146 220 ohm, l/4!:, 5%, R141 14-5751 750 ohm, lI4W. 5%. R170 14-5222 14-5392 14-5472 14-5752 CCL4703 DIODE: 1X914, CRllO,llY CO14308 34-2x3904 co14394...
Page 125 CA015326 co15505 CO14725 co14715 co12995 13 PIN, RIGIE rnIGLE, 5107,108 23 PIN, 5106 3 PIN, J104,J105 CO14796 LATCHING FASTEiUTR CO14025 PROCEDURE, 810 REAR BOARD SOURCE: CA014161 2014 HE" 12...
Page 126 PCB SW-ASSEMBLY co14332 CO14348 A108 PCB AsSExBLy co14329 co10745 IC: CUST’X. Al01 IC: CUSTOM; Al04 IC: 6810. CO14328 co14334 xc: 4077 2104 co14333 4011 4069 CO11465xx 'TRANSISTOR ARRAY R.F. SEIELD CO14136 OUTSIDE TPSSE R.F. Smm.D CO14137 CO14138 810 SIDE EOARD...
Page 127 Appendix A ATARI 810 Block Diagram Appendix B Appendix C 810 Side Board Silkscreen Appendix D 810 Rear Board Schematic Appendix E 810 Rear Board Silkscreen Harness Appendix F 810 Wiring Appendix G ERROR Code Listing...
Page 133 ALTERNATE WIRING HARNESS ARRANGEMENT...
Page 134 Serial iius Data u.lne Checksum F.rxo?z 146, Function not Inplemented 1 6 0 Drive Number Error Disk Full File Xunber Mismatch POINT oafa Length Error File Locked Directory Full 1 7 0 File Xot Found POINT Invalid disk drives, printers, or ocher acccs.. devices.
Page 135 10-l...
Page 136 INDEX ERASE DRIVER 2 - 1 2 ERASE HEAD ERROR CODES FLOPPY DISK CONTROLLER 2-10.12 FLYWHEEL FORMATTING B E A D HIGH LEVEL DRIVE LOW LEVEL DRIVE PARTS LISTS PCB, REAR PCB, SIDE POWER SUPPLY POWER UP LOGIC CIRCUIT PULSE REGENERATOR 2-15 QUICKCHECK...
Page 137 INDEX R E G U L T O R APPENDIX BASEPLATE’ BLOCK DIAG-M BUSY LITE 2-18 ASSEMBLY CARRIER 6-38 CASE, DISK DRIVE CAT’S-EYE PATTZRN CLEANING PROCEDURE CLOCK CIRCUITRY COME’ATABILITY TEST C Y C L I C C H E C K S DATA DATA I/O &...
Page 138 INDEX SETUP GATE SIGNAL 2-13 SILKSCREEN, REAR BOARD SILKSCREEN, SIDE BOARD SPECIFICATIONS SPEED ADYUSTMENT SPINDLE, DRIVE SPINDLE SHAFT BEARINGS STEPPER :-!OTOR STEPPER ?lOTOR & LOGIC SYMMETRY A% 2-13 THEORY OF OPERATION 2 - 1 TIME DOMAIN FILTER i-11 TRANSPORT, DRIVE TRANSPORT FLYWHEEL/DRIVE SPINDLE...

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