Apple Disk II Technical Procedures

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Disk Safety Check5. 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 vertically6. Connect the probe cable to the channel 1 (or A) input of theoscilloscope.7. Connect the probe tip to the front end of Rll and the ground leadto TP4 on the Analog Card of the drive being tested.8. Boot the Calibration (or Alignment Aid) Diskette in the known gooddrive, then remove the diskette (let's not take any chances).9. After the main menu appears, slowly type ASAA to select drive 2 asthe target disk, then press .10. Slowly type SSSSA to select the Seek function. The drive beingtested should recalibrate and spin.11. 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 3.8
The Test:12. Change the oscilloscope controls as follows:SECONDS(or TIME)/DIV = .5 MSEC/D1VVOLTS(or AMPLITUDE)/DIV - 50 MV/DIV (5 MV/DIV for 10X probe)Input (AC/DC/GND) = ACSweep Mode (AUTO/NORM) = NORM (the trace will disappear)13. Connect the probe tip to TP8.14. Put the Alignment diskette (090-0004) in the drive being tested.15. Slowly type SSSA34, then press to move the head to track34.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.9
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 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
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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