Apple Disk II Technical Procedures
Apple Disk II Technical Procedures Apple Disk II Technical Procedures
B. AMPLITUDE TESTThe amplitude test should be done any time there are problems readingdata or programs, especially those that the drive being tested haswritten.This test checks whether the electronics are producing a large enoughsignal to operate reliably.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 ]['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 = 1 uSEC/DIVVOLTS(or AMPLITUDE)/DIV = 50 MV/DIV (5 MV/DIV for 10X probe)Trigger source (INT/EXT) = INTTrigger slope (POS/NEG) = POSInput (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 3.4
7. Connect the probe tip to TP8 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 (let's not take any chances).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 3.5
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B. AMPLITUDE TESTThe amplitude test should be done any time there are problems readingdata or programs, especially those that the drive being tested haswritten.This test checks whether the electronics are producing a large enoughsignal to operate reliably.Materials needed:1. <strong>Apple</strong> ][ system with known-good disk drive and interface.2. <strong>Disk</strong> Calibration <strong>Disk</strong>ette (P/N 686-0006)or<strong>Disk</strong> Alignment Aid diskette (P/N 652-0199)3. Scratch (expendable) diskette4. Drive to be tested5. Oscilloscope6. #2 Philips screwdriverTo run the Amplitude Test:<strong>Apple</strong> and Drive Set-up:1. Turn the <strong>Apple</strong> ]['s power off.2. Install the known good <strong>Disk</strong> 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 = 1 uSEC/DIVVOLTS(or AMPLITUDE)/DIV = 50 MV/DIV (5 MV/DIV for 10X probe)Trigger source (INT/EXT) = INTTrigger slope (POS/NEG) = POSInput (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 PAGE<strong>Disk</strong> Drive Calibration rev. 09/10/82 page 3.4
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