Apple Disk II Technical Procedures

The Test:13. Change the oscilloscope controls as follows:SECONDS(or TIME)/DIV = 20 MSEC/DIVVOLTS(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)14. Connect the scope probe tip to TP9.15. Put the Alignment diskette (090-0004) into the drive to beadjusted,16. Slowly type SSSA16, then press to move the head to track16.17. Turn the oscilloscope's trigger LEVEL control all the way counterclockwise,then rotate it slowly clockwise until a "lobe 11 patternappears. Adjacent lobes should be about the same size, with thesmaller being no less than 80% the size of the larger.CONTINUED ON NEXT PAGEDisk Drive Calibration rev. 09/10/82 page 3.16