Apple Disk II Technical Procedures

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E. HEAD RADIAL ADJUSTMENTThe Head Radial adjustment should be done when you have troublebooting, or have a compatability problem between drives (i.e. one hastrouble reading what the other writes). It should also be done afterthe carriage limiter adjustment is done.This adjustment fine-tunes the head position so that it will move tothe exact center of each track.Materials needed:1. Apple ][ system with known-good disk drive and interface.2. Disk Calibration Diskette (P/N 686-0006)orDisk Alignment Aid diskette (P/N 652-0199)3. Disk Alignment diskette (P/N 090-0004)4. #2 Phillips screwdriver5. Medium flat-bladed screwdriver6. Oscilloscope7. Drive to be adjustedTo do the head radial adjustment:Apple and Drive Set-up1. Turn the Apple ]['s power off.2. Install the known good Disk Interface card in slot 6.3. Connect the known good drive to the Drive 1 position of theInterface card.4. Remove the cover from the drive to be tested.5. Connect the drive to the Drive 2 position on the disk interfacecard.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.14
Disk Safety Check6. Set the oscilloscope controls as follows:SECONDS(or TIME)/DIV = 10 MSEC/DIVVOLTS(or AMPLITUDE)/DIV = 5 V/DIV (.5 V/DIV for a 10X probe)Trigger source (INT/EXT) • INTTrigger slope (POS/NEG) = POSInput (AC/DC/GND) - GNDDisplay (CH1/CH2 or A/B) - CHI or ASweep Mode (AUTO/NORM) = AUTOPower (ON/OFF) - ONINTENSITY and FOCUS for the best trace displayCHI (or A, or VERT) POSITION to center the trace vertically7. Connect the probe cable to the channel 1 (or A) input of theoscilloscope.8. Connect the probe tip to the front end of Rll and the ground leadto TP4 on the Analog Card of the drive being tested.9. Boot the Calibration (or Alignment Aid) diskette in the known-gooddrive, then remove the diskette.10. After the main menu appears, slowly type ASAA to set slot 6, drive2 as the drive to be tested, then press .11. Slowly type SSSSA to select the Seek function. The target disk willrecalibrate and continue to run.12. While watching the trace, switch the oscilloscope's input selector(AC/DC/GND) to DC. If the trace moves up or down, DO NOT CONTINUEWITH THE TEST. Replace the analog card and start again.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.15
Page 1: DISK ][ TECHNICAL PROCEDURESTABLE O
Page 5 and 6: A. REMOVING THE DISK DRIVE COVER1.
Page 7 and 8: B. REPLACING THE DISK DRIVE CABLERe
Page 9 and 10: C. REPLACING THE ANALOG CARDRemovin
Page 11 and 12: D. REPLACING THE COLLET HUBRemoving
Page 13 and 14: Disk ][ Technical ProceduresSection
Page 15 and 16: A. COLLET HUB ADJUSTMENTIf the disk
Page 17: B. DRIVE DOOR ADJUSTMENTWhen the di
Page 20 and 21: D. DRIVE SPEED ADJUSTMENT — THE D
Page 22 and 23: disk ][ adjustments rev. 8-31-82 pa
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Page 28 and 29: B. AMPLITUDE TESTThe amplitude test
Page 30 and 31: 13. After the test signal has been
Page 32 and 33: Disk Safety Check5. Set the oscillo
Page 34 and 35: 16. Turn the oscilloscope's trigger
Page 36 and 37: The Test:7. Boot the Calibration (o
Page 40 and 41: The Test:13. Change the oscilloscop
Page 42 and 43: ALPS Drive adjustment:23. Adjust th
Page 44 and 45: F. COMPARATOR OFFSET ADJUSTMENT:The
Page 46 and 47: 13. After the test signal has been
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Apple Disk II Technical Procedures

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