Apple Disk II Technical Procedures

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F. COMPARATOR OFFSET ADJUSTMENT:The comparator offset adjustment should be done if the Analog board isreplaced.It ensures that a "one" stored on the disk will be read as a one, and a"zero" as a zero.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. Scratch (expendable) diskette4. Drive to be tested5. Oscilloscope6. #2 Philips screwdriverTo run the Amplitude Test:Apple and Drive Set-up:1. Turn the Apple ][ f 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. Connect the drive tothe Drive 2 position on the Interface card.Oscilloscope Set-up:5. Set the oscilloscope controls as follows:SECONDS(or TIME)/DIV = .5 uSEC/DIVV0LTS(or AMPLITUDE)/DIV = 1 V/DIV (.1 V/DIV for 10X probe)Trigger source (INT/EXT) - INTTrigger slope (POS/NEG) = NEGInput (AC/DC/GND) = ACDisplay (CH1/CH2 or A/B) = CHI or ASweep Mode (AUTO/NORM) - AUTOPower (ON/OFF) - ONINTENSITY and FOCUS for a clear sweep display6. Connect the probe cable to the channel 1 (or A) input of theoscilloscope.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.20
7. Connect the probe tip to TP5 and the ground lead to TP4 on theAnalog Card of the drive being tested.The Test:8. Boot the Calibration (or Alignment Aid) Diskette in the known gooddrive, then remove the diskette.9. Put the scratch diskette in the drive being tested,10. After the main menu appears, slowly type ASAA to select drive 2 asthe target disk, then press .11. Slowly type SSA to select the Amplitude test.12. A warning will be displayed on the screen that the test will writeon any diskette in the target drive. Type A to proceed with thetest.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.21
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
Page 25: Disk Drive Technical ProceduresSect
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 38 and 39: E. HEAD RADIAL ADJUSTMENTThe Head R
Page 40 and 41: The Test:13. Change the oscilloscop
Page 42 and 43: ALPS Drive adjustment:23. Adjust th
Page 46 and 47: 13. After the test signal has been
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Page 56 and 57: Disk ][ Analog Board rev. Jun 84 Pa
Page 62 and 63: Disk ][ Analog Card rev. Jun 84 Pag
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Apple Disk II Technical Procedures

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