Apple Disk II Technical Procedures

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 control for a clear, stabledisplay. The waveform should appear as follows, with a minimumamplitude of 150 MV (3 divisions).14. Place the probe tip on TP9. Check that the display shows the samewaveform as in step 13.15. Turn the Apple ][ off, then disconnect the customer's drive and(assuming that it is good at this point) re-assemble it.This concludes the Amplitude Test.If the amplitude is found to be unacceptable, replace the diskmechanical assembly and run the test again. If the problem persists,replace the analog card (on the customer's mechanical assembly) and runthe test again.Disk Drive Calibration rev. 09/10/82 page 3.6