Page 1 ATARI 810 DISK DRIVE FIELD SERVICE MANUAL □JULY 1980 FS015854 REV.1...
Page 3: Table Of Contents
TABLE OF CONTENTS 1. SPECIFICATIONS 2. THEORY OF OPERATION 3. BLOCK DIAGRAMS & SCHEMATICS 4. FLOPPY QUICKCHECK 5. TROUBLESHOOTING GUIDE 6. DISSASSEMBLY/REASSEMBLY 7. ADJUSTMENTS 8. PARTS LISTS 9. APPENDIX 10. INDEX 10-1...
Page 4: Specifications
SPECIFICATIONS...
Page 5: Bytes
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. 10. 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
THEORY OF OPERATION...
Page 7 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.
Page 8 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 DATA INPUT/OUTPUT AND MANIPULATION SECTION...
Page 9 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.
Page 10 The Drive’s ROM contains specific operating instructions used by the MPU to accomplish a variety functions. These functions include telling the Disk controller (WD1771-01) what task to perform. The Drive’s RAM is used by the MPU for temporary storage of both data and system information. The Drive’s Data Output Buffer transfers the formatted data through the PIA to the Data Out line going to the Computer Console.
Page 11 DATA INTERFACE SECTION 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.
Page 12 The Drive’s Write and Erase Logic circuitry is controlled 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...
Page 13 Read/Write Head signal decay, rather than intentional signal level changes). • 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.
Page 14 Two 180’ out-of-phase signals are generated by head during a read operation and amplified by the Differential Amplifier. The Differentiator 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.
Page 15 STEPPER MOTOR AND LOGIC The Stepper Motor is a four phase motor with a 3.6° rotor rotation per step. The motor has a total of 100 poles, providing 100 rotor steps for the motor’s full 360° rotation. Stepper Motor and Logic Each step change in the motor is translated through a steel band connection to a single track change far the Read/Write and Record Head assembly.
Page 16 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 Feedback circuit. Variations in motor speed, as sensed by the Tach Feedback circuit, vary the current supplied to the motor.
Page 17 DISK DRIVE SELECT 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.
Page 18 A "PWR ON” lite (LED) is turned on through the -5 VDC section of the supply. READ/WRITE AND ERASE HEADS A magnetic head converts electrical currents into magnetic fields, and vice-versa. The Read/Write Head consists primarily of two ferrite core halves, wound with a centertapped coil.
Page 19 When the ferric oxide coating on the diskette is in contact with the head, it completes the 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.
Page 20 READ OPERATION 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 (i.e.
Page 21 2-16...
Page 22 All 40 tracks receive the same formatting as follows: bytes byte (index mark) bytes 00 or FF bytes byte byte Track Number (00 thru 27 hex) byte byte Sector Number (01 thru 12 hex) byte byte CRC byte 2 byte CRC byte 1 bytes 00 (or 11 bytes FF and 6 bytes 00)
Page 23: Block Diagrams & Schematics
BLOCK DIAGRAMS 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.
Page 24 ATARI 810 DISK DRIVE BLOCK DIAGRAM...
Page 25 ATARI 810 SIDE BOARD BLOCK DIAGRAM...
Page 26 ATARI 810 SIDE BOARD SCHEMATIC DIAGRAM...
Page 27 ATARI 810 REAR BOARD BLOCK DIAGRAM...
Page 28 ATARI 810 REAR BOARD SCHEMATIC DIAGRAM...
Page 29: Floppy Quickcheck
FLOPPY QUICKCHECK...
Page 30 This procedure should he completed both as a pre- service checkout and a 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 checkout, it will ensure that all repairs and alignments were successfully completed.
Page 31 The following are required to perform these procedures: A. Atari 400/800 Computer Console with a BASIC cartridge and minimum 16K RAM installed. B. I/O cables and Console/Drive power packs. C. TV. D. Master Disk File Manager diskette with writeprotect notch taped.
Page 32 Verify that the DOS menu appears on the TV screen. Refer to the Troubleshooting Guide if you encounter an ERROR on the TV screen. WRITE PROTECT TEST This test must be completed with the write-protected Master diskette installed. The TV screen should be displaying the DOS menu from the Booting Test.
Page 33 3. Verify that after about 45 seconds OE formatting the Drive’s BUSY lite turns OFF and no ERRORS have been displayed on the TV screen (refer to the Troubleshooting Guide for any ERRORS). 4. At the Console: a. type A b.
Page 34 5. Delete the file as follows: a. At the Console: 1. press RETURN 2. type D 3. press RETURN 4. type DOS.SYS 5. press RETURN 6. type y 7. press RETURN b. After a "SELECT ITEM” appears, at the Console: 1.
Page 35: Troubleshooting Guide
COMPATIBILITY 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 ON. 3. Verify that after about 10 seconds, the TV screen displays READY.
Page 37 SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION A. Defective transformer. A. Replace transformer. B. Electrical malfunction: Power Switch on Side B. Replace and/or Drive will not turn PCB, Power Supply on troubleshoot PCB(s). Rear PCB. Drive will not turn A. Defective Side and/or A.
Page 38 Continue… SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION A. Damaged diskette. A. Replace diskette. B. Dirty or magnetized B. Clean and head. demagnetize head. Occasional read errors all tracks. C. Worn or dirty head C. Replace head pressure pad. pressure pad. D. Overstressed pressure D.
Page 39: Dissassembly/Reassembly
DISSASSEMBLY / REASSEMBLY...
Page 40 DISASSEMBLY AND REASSEMBLY The level of Disk Drive disassembly will vary with the specific problem encountered. Some procedures list steps which are themselves procedures: i.e. "Disassemble the Drive case." When you encounter an underlined step, turn to that procedure first and follow it before proceeding.
Page 41 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.
Page 42 DISSASSEMBLY 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.
Page 43 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. 2. Disconnect the AC transformer power cord from the PWR jack at the rear of the Drive chassis.
Page 44 NOTE: As you lift the baseplate from the base, the front coverplate will lift out at the 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 1.
Page 45 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 and its upper rear corner. Lift the PCB straight up to disengage its rear jack from the row of pins NOTE: You may have to rock the PCB slightly to overcome the jack-to-pin tension between the two...
Page 46 REMOVING THE RF SHIELD (SIDE PCB) 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the side PCS from the common baseplate. 4. Locate and carefully straighten the three tabs securing the RF shield case halves together on the side P6B.
Page 47 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. Grass the transport securely, tip the assembly upside down, and place it on a suitable work surface.
Page 48 REMOVING THE REAR PCB 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. 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 49 REMOVING Q113 (TRANSISTOR)/A108 (VOLTAGE REGULATOR) 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the side PCB from the common baseplate. 4. Remove the rear PCB from the common baseplate. 5. Locate and remove the single screw securing the device (either transistor Q113 or voltage regulatorAl08) to the common baseplate.
Page 50 REMOVING THE TRANSPORT DRIVE BELT 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the Drive transport from the common baseplate. 4. Carefully lay the transport on its side. 5. Locate and remove the drive belt. NOTE: TO remove the drive belt without stretching or damaging rotate the large flywheel (naked for strobe) while easing the belt off the outside edge of the...
Page 51 REMOVING THE TRANSPORT DRIVE MOTOR 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the Drive transport from the common baseplate 4. Remove the drive belt from the transport. 5. Locate and disconnect the single black ground lead coming from the drive motor wiring harness and going to the transport casting.
Page 52 REMOVING THE CARRIER ASSEMBLY 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. 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. 5.
Page 53 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. 10.
Page 54 REMOVING THE TRANSPORT FLYWHEEL/DRIVE SPINDLE 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the Drive transport from the comma baseplate. 4. Remove the drive belt from the transport. . 5. Remove the carrier assembly from the transport. 6.
Page 55 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. 6-17...
Page 56 REMOVING THE TRANSPORT SPINDLE SHAFT BEARINGS 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the Drive transport from the common baseplate. 4. Remove the Drive belt from the transport. 5. Remove the carrier assembly from the transport. 6.
Page 57 REMOVING THE HEAD ASSEMBLY 1. Disassemble the Disk Drive case. 2. Remove the common baseplate from the Drive base. 3. Remove the Drive transport from the common baseplate. 4. Remove the Drive belt from the transport. 5. Locate the nylon clamp securing the record/playback and erase head I/O wiring harness to the right rear corner of the casting.
Page 58 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.
Page 59 11. Carefully pry the two guiderods up out of their locating notches in the drive casting. 12. Gently lift the head assembly carriage and guiderods away from the casting. You will have to feed the head I/O cable through the casting at the same time.
Page 60 REMOVING THE STEPPER MOTOR 1. Disassemble the Disk Drive case. 2. 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 motor positioning band to the right side of the head assembly.
Page 61 5. Locate the allen-head setscrew securing the head positioning strap pulley to the stepper motor drive shaft (topside of casting). 6. Back the setscrew out about 1turn (counterclockwise). 7. Remove the band/pulley from the stepper motor shaft and set it aside. 8.
Page 62 REASSEMBLY STEPPER HEAD DRIVE RF SHIELD BEARINGS Q113/A108 MOTOR ASSEMBLY MOTOR (SIDE PCB) FLYWHEEL CARRIER REAR ASSEMBLY BOARD DRIVE BELT DRIVE BELT ADJ. TRANSPORT HEAD HEAD COMMON SIDE PCB TRACK CLEAN BASEPLATE ALIGN SPEED TRACK DRIVE FINAL CNTRL 00 STOP CASE CHECK ADJ.
Page 63 INSTALLING THE STEPPER MOTOR 1. Install a split rubber grommet on the stepper motor wiring harness. 2. Lay the transport on its left side. 3. 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.
Page 64 4. Install a flatwasher, a splitring lockwasher, and a l/4" hexnut onto each of the two stepper motor stud bolts projecting through the top of the casting. Lightly tighten the nuts. 5. Carefully install the head positioning band pulley onto the stepper motor drive shaft (projecting through the top of the casting).
Page 65 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.
Page 66 12. Use a pointed tool (i.e. 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. 13. Slide the wiring harness, grommet up into the slot at the rear of the transport casting.
Page 67 1. Slide the two guiderods into the sides of the head assembly carriage. 2. 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. 3. Wrap a small piece of masking tape around the head assembly’s wiring harness, about 3"...
Page 68 6. Position the two guiderod clamps onto the casting, over the ends of the guiderods. 7. Install, but do not tighten, the front clamp screw including a splitring lockwasher. 8. Install, but do not tighten, the rear clamp screw including two male faston terminals and a splitring lockwasher.
Page 69 10. Carefully position the head assembly so that you can connect the positioning band to the assembly right rear corner. 11. 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.
Page 70 17. Use a pointed tool (i.e. 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. 18. Attach the black ground lead (drive motor wiring harness) to one of the faston lugs at the rear of the transport.
Page 71 INSTALLING THE TRANSPORT SPINDLE SHAFT BEARINGS 1. 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.
Page 72 INSTALLING THE TRANSPORT FLYWHEEL / DRIVE SPINDLE 1. Lay the transport casting on its side. 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.
Page 73 4. From the bottom side of the casting, position the flywheel, screw and washer combination over the bottom of the spindle shaft. Screw the assembly together. Torque the screw to 6 inch lbs. 5. Rotate the flywheel and check for wobble, runout or binding of either the flywheel or drive spindle.
Page 74 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.
Page 75 2. 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. 3. Install and slightly tighten the two screws, splitring lockwashers, and flatwashers at the rear corners of the carrier assembly.
Page 76 5. Tighten the four screws securing the bezel to the transport. 6. Latch the carrier assembly closed (down) at the bezel. 7. Horizontally center the door in the door opening of the bezel. 6-38...
Page 77 8. Tighten (10 inch lbs.) the two screws securing the rear corners of the carrier assembly to the rear of the transport casting. 9. Press the front door release button. Ensure that the door opens and the carrier assembly lifts the head assembly pressure pad arm.
Page 78 15. With the carrier assembly open, push the diskette eject block (right rear corner) until it latches into its rear position under the latch lever. 16. Close the carrier assembly and then press the release button to reopen the door. 17.
Page 79 INSTALLING THE DRIVE MOTOR 1. Lay the Drive transport on its side. 2. Position the drive motor onto the 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.
Page 80 INSTALLING THE TRANSPORT DRIVE BELT 1. Lay the transport on its side. 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...
Page 81 INSTALLING Q113 (TRANSISTOR)/A108 (VOLTAGE REGULATOR) 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. b. Place the insulating plate into location on the common baseplate.
Page 82 3. If you are installing A108(voltage regulator): a. Apply heat transfer compound to the back of the voltage reql1ator. : b. Position the regulator onto the common baseplate. c. Secure the device to the baseplate with a #4 x l/4 THD F PHIL HD. screw. 4.
Page 83 INSTALLING THE REAR PCB 1. 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.
Page 84 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 subassemblies and components. 1. Carefully set the transport upside down on a suitable work surface.
Page 85 5. Locate and connect the record/playback and erase head I/O wiring harness (shielded red, (blank), blue and either white, black or black, white) to the rear PCB (nonpolarized, X4). 6. Locate and connect the drive motor/ground wiring harness (yellow, green, blue, red, black) to the rear PCB (nonpolarized, #3).
Page 86 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 on the side PCB. 2. Position the ground bracket onto the side PCB. 3.
Page 87 INSTALLING THE SIDE PCB 1. Position the side PCB on the common baseplate (with rear PCB installed). 2. Gently seat the multipin socket at the rear lower edge of the side PCB down onto the pins protruding from the rear PCB. 3.
Page 88 4. Locate and connect the stepper motor wiring harness (black, white, red, green, brown) from the Drive transport to the side PCB (nonpolarized, ’P2). 5. Locate and connect the write protect wiring harness (black, green, (blank), red, black) to the side PCB (nonpolarized, #1). 6.
Page 89 INSTALLING THE COMMON BASEPLATE 1. Ensure that every boss in the base (even those not used to secure the baseplate is topped with a rubber isolation washer. 2. 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.
Page 90 5. Refer to the adjustments section of this manual and complete the head cleaning and demagnetization procedure. 6. Refer to the adjustments section of this manual and complete the radial track alignment, speed control adjustment, and track 00 end stop adjustment.
Page 91 ASSEMBLING THE DRIVE CASE 1. Carefully position the tophousing onto the base and coverplate. 2. Install and tighten the four screws (#6-3/4” SHTMTL, PHIL HD.) securing the tophousing to the coverplate. Install the screw hole covers. 3. Refer to the final checkout section of this manual and complete the full checkout procedure for the Drive.
Page 92: Adjustments
ADJUSTMENTS...
Page 93 READ/WRITE & ERASE HEAD CLEANING & 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.
Page 94 3. To demagnetize the head, hold the energized demagnetizing tool about 6 inches above the head. Slowly lower the tool toward the head in a spiraling motion. DO NOT allow the tool to come into contact with the head. 4. Reverse the procedure as you lift the tool away from the head.
Page 95 The following are required to perform this procedure: A. Oscilloscope, dual trace with A+B function, and B invert function, with two probes. B. Atari 400/800 Computer Console with minimum 16K RAM installed. C. I/O cables and Console/Drive power packs. D. Disk Alignment Cartridge or Program.
Page 96 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.
Page 97 CAT’S-EYE PATTERN 10. The ’scope should be displaying a repeating cat’s-eye lobe pattern as shown above. a. If the lobes are of equal amplitude, goon to step 11. b. If the lobes are of unequal amplitudes, proceed as follows: 1. Locate the setscrew securing the stepper motor positioning band pulley to the stepper motor shaft.
Page 98 "CAT’S EYES" DISPLAY AS A FUNCTION OF READ HEAD to TRACK 16 POSITION 7. 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 out to track 32 and return to read track 16.
Page 99 14. Command the Drive to read any track. 15. Refer to the following guide for correct tachometer frequencies. If the tested frequency is not correct, adjust R142.
Page 100 SPEED ADJUSTMENT GUIDE DRIVE MOTOR DRIVE DRIVE TACH ONE CYCLE PULLEY MOTOR BELT FREQUENCY TIME DIAMETER PART NO. Mylar .250” 390 Hz 2.564 msec 3-35003-002 (yellow) Mylar .300” 320 Hz 3.125 msec 3-35003-001 (yellow) Neoprene .300” 305 Hz 3,279 msec 3-35003-001 (black)
Page 101 TRACK 00 STOP ADJUSTMENT The following are required to perform this procedure: A. Atari 400/800 Computer Console with minimum 16K RAM installed. B. I/O cables and Console/Drive power packs. C. Disk Alignment Cartridge (Console) or Disk Alignment Program. D. Master Alignment Diskette.
Page 102 6. Check and adjust as needed for a 0.010 inch clearance between the setscrew and the rear corner of the head carriage plastic molding. 7. Command the Drive to step out to any track above 30 and then return to track 00. 8.
Page 103 MYLAR (YELLOW) DRIVE BELT 1. Loosen but do not remove the two screws securing the drive motor to the transport casting. (In this point of part “Adjustments” source has ended) 7-12...
Page 104: Parts Lists
PARTS LISTS...
Page 105 SCREW #6-32X1/4 PHIL.HD. 72-1406S SCREW #4-40X3/8 PHIL.HD. 72-CL404 SCREW #4X1/4 THD. FRM. PHIL. HD. CO14814 WASHER SHOULDER CO14811 INSULATOR 75-044 LOCKWASHER 75-914C NUT #4 CA014833 PCB ASSEMBLY (REAR) CA014161 PCB SUB-ASSEMBLY (REAR) CO14025 PCB FAB 72-CL605 SCREW #6X5/16 THD.F.PHIL.HD. 810 COVER...
Page 106 SCREW #6-3/4 SHEETM.P.H:PHIL. 82-AL608 SCREW #6-l/2 B.T.PHIL.HD. CA014122 CABLE ASSEMBLY (13 PIN) CA014121 CABLE SUB-ASSEMBLY CO11506 SHIPPING LABEL CO14845 WARRANTY CARD CA015303 POLY ENVELOPE ASSEMBLY CO15304 RETAILER WARRANTY CARD CO15305 POLY ENVELOPE CO15936 PUBLICATIONS QUESTIONNAIRE CA015598-XX SERVICE CENTER LIST PACKET 810 COVER...
Page 107 RESISTOR: 47K, l/4W, 5%, Rl19,130 14-5104 RESISTOR: 100K: l/4W, 5%, R135, 136 14-5224 RESISTOR: 220K 1/4W, 5%, R127 14-5750 RESISTOR: 75 , l/4W, 5%, R175 CO14702 INDUCTOR: 470uH, L101 CO14384 FERRITE BEAD, L102,103 31-1N914 DIODE: lN914, CR120, CR121, CR122 810 SIDE BOARD...
Page 108 IC: CD4011, Z102 CO11465-XX IC: CD4069, Z103 CO10174-XX IC: CA3086, A106 CO14136 INSIDE COMPONENT R.F. SHIELD CO14137 OUTSIDE TRACE R.F. SHIELD 72-CL605 SCREW, #6X5/16” THD. F. PHIL. HD. CO14138 GROUND BRACKET CO14641-10 PCB SERIAL NO. LABEL (SEE MFG. PROCEDURE) 810 SIDE BOARD...
Page 109 RESISTOR: 7.5K, 1/4W, 5%, Rl69 14-5103 RESISTOR: 10K, 1/4W, 5%, Rl40,143,152, 153,157,158,165,166 14-5105 RESISTOR: 1M, 1/4W, 5%, Rl44 15-5360 RESISTOR: 36 , 1/2W, 5%, R172 I9-411504 RESISTOR: VARIABLE 500K, R142 CO14703 INDUCTOR: 680Uh, l103 31-lN914 DIODE: 1N914, CR110,119 810 REAR BOARD...
Page 110 CONNECTOR: 23PIN, J106 CO14716-03 CONNECTOR: 3PIN, J104,105 CO14719-02 CONNECTOR: 5PIN, J103,109 CO14796 LATCHING FASTENER CO14025 CO14641-11 PCB SERIAL NO. LABEL (SEE MFG. PROCEDURE) CA014161 PCB SUB-ASSEMBLY CO14332 IC: LM311, A109 CO10174-XX TRANSISTOR ARRAY, A107,110,111 CO14348 VOLTAGE REGULATOR, 7805, A108 810 REAR BOARD...
Page 111: Appendix
APPENDIX...
Page 112 Appendix A ATARI 810 Block Diagram Appendix B 810 Side Board Schematic Appendix C 810 Side Board Silkscreen Appendix D Rear Board Schematic Appendix E 810 Rear Board Silkscreen Appendix F 810 Wiring Harness Diagram (Alternate) Appendix G ERROR Code Listing...
Page 113 ATARI 810 DISK DRIVE BLOCK DIAGRAM...
Page 114 ATARI 810 SIDE BOARD SCHEMATIC DIAGRAM...
Page 115 ATARI 810 SIDE BOARD SILKSCREEN...
Page 116 ATARI 810 REAR BOARD SCHEMATIC DIAGRAM...
Page 117 ATARI 810 REAR BOARD SILKSCREEN...
Page 118 ALTERNATE WIRING HARNESS ARRANGEMENT...
Page 119 ERROR CODES Error Error Code Message Code Memory Insufficient Value Error Too Many Variables String Length Error Out of Data Error Number Greater than 32767 INPUT Statement Error Array of String DIM Error Argument Stack Overflow Floating Point Overflow/Underflow Error Line Not Found No Matching FOR Statement Line Too Long Error...
Page 120 NOTE: The following are INPUT/OUTPUT errors that result during the use of disk drives, printers, or other accessory devices. Further information is provided with the auxiliary hardware. Error Error Code Message Code LOAD Program Too Long Device Number Larger LOAD File Error BREAK Abort IOCB Nonexistent Device...
Page 121: Index
INDEX 10-1...
Page 122 INDEX A108 (VOLTAGE REGULATOR) 6-11,43,44 ADJUSTMENTS, ALIGNMENTS APPENDIX BASEPLATE 6-6,51 BLOCK DIAGRAM 3-1,2,3 BOOTING TEST BUSY LITE 2-11 CARRIER ASSEMBLY 6-14 CASE, DISK DRIVE CAT’S-EYE PATTERN CLEANING PROCEDURE CLOCK CIRCUITRY COMPATABILITY TEST CYCLIC REDUNDANCY CHECKS 2-6,17 DATA GATE DATA I/O & MANIPULATION DATA INTERFACE DEMAGNETIZATION DIFFERENTIAL AMPLIFIER...
Page 123 INDEX POWER SUPPLY 2-3,12 POWER UP LOGIC CIRCUIT PULSE REGENERATOR Q113 (TRANSISTOR) 6-11,43 QUICKCHECK RADIAL TRACK ALIGNMENT REASSEMBLY READ DATA CONDITIONING CIRCUITRY READ OPERATION 2-15 READ/WRITE & ERASE HEADS 2-13 READ/WRITE 2-13 ERASE HEAD CLEANING & DEMAGNETIZATION RF SHIELD 6-8,48 SCHEMATIC, REAR-BOARD 3-6, 9-6 SCHEMATIC, SIDE BOARD...

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