Apple Disk II Technical Procedures

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13. After the test signal has been written to the diskette, a messagewill be displayed to tell you that you may proceed with the test.Adjust the oscilloscope's trigger LEVEL and INTENSITY controls fora stable display (though some jitter may be present near the rightend). The rising portion of the pulse should be 2. 5 - 3.0microseconds wide (5-6 divisions). The total pulse width will be3.75 - 4.0 microseconds (7.5 - 8 divisions).14. If necessary, adjust potentiometer R21 or R33 until the centralpeak is in the correct position.NOTE: On most Analog boards, R21 is a fixed resistor and R33 is theadjustment. On some, R21 is a potentiometer and should be used forthe adjustment. On other boards, neither potentiometer is present.In this last case, the board must be replaced if adjustment isindicated.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.22
15. Change the oscilloscope's sweep speed to 1 uSEC/DIV.16. Move the scope probe tip to TP7. Adjust the trigger LEVEL controlto get a clear display. The pulses at this point should have nodual images on the rising and falling edges (though a certainamount of jitter will be present).16. If necessary, adjust potentiometer R28 on the analog card untilthere is a single, stable image with a minimum of jitter.17. After you have made the adjustments, turn the Apple ][ off. Thendisconnect the customer's drive, apply Glyptol to thepotentiometers, and re-assemble the drive.This completes the Comparator Offset adjustment procedure.If you were unable to make the adjustments, replace the Analog boardand run the test again.Disk Drive Calibration rev. 09/10/82 page 3.23
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 44 and 45: F. COMPARATOR OFFSET ADJUSTMENT:The
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Apple Disk II Technical Procedures

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