Apple Disk II Technical Procedures

SHUGART drive adjustment:23. Rotate the stepper motor slowly counterclockwise until the smallerof the adjacent lobes is about half the size of the larger.24. Rotate the motor slowly clockwise. When the smaller of the adjacentlobes is as close to 80% as big as the larger as you can get it,hold the stepper motor in place and tighten the mounting screws.25. Turn the drive to its normal operating position (usually bottomdown)•26. Slowly type SA to recalibrate the drive.27. Slowly type SSSA16, then press to move the head back totrack 16.28. Wait about thirty seconds for the drive to settle, then re-checkthe pattern on the scope. If the smaller of the adjacent lobesisn't still at least 80% as big as the larger, loosen the mountingscrews and repeat steps 24-28 (up to two times).29. If the previous step was successful, slowly type A34, then press to move the head to track 34.30. Slowly type A16, then press to move the head back to track16 from the other direction.31. Wait about thirty seconds for the drive to settle, then re-checkthe lobe pattern on the scope. If the smaller of the adjacent lobesisn't still at least 80% as big as the larger, loosen the mountingscrews and repeat steps 24-31 (up to two times).32. After you have completed the adjustment, turn the Apple ][ off,disconnect the customer's drive, apply Glyptol to the mountingscrews and reassemble the drive.This completes the Head Radial Adjustment procedure for SHUGART drives.If you were unable to make the adjustment, replace the mechanicalassembly and run the test again.Disk Drive Calibration rev. 09/10/82 page 3.19