Apple Disk II Technical Procedures
Apple Disk II Technical Procedures
Apple Disk II Technical Procedures
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IntroductionThis document contains Level 1 repair procedures for the disk][ analog card. The disk ][ analog card is used in the <strong>Disk</strong>][ drive which is used by the <strong>Apple</strong> ][, ] [ + and //ecomputers. In order to thoroughly test the analog card,follow ALL of the procedures in this section. Doing thiswill insure that no potential problems are overlooked.Materials Required<strong>Apple</strong> //e Computer<strong>Disk</strong> ][ (complete) with disk controller<strong>Disk</strong> ][ mechanical assembly<strong>Disk</strong> Alignment Aid diskette (p/n: 652-0199)Copy of DOS 3.3 System Master diskette (non-write protected)Blank diskette<strong>Disk</strong> ][ Interface cableReplacement ICs (one each):74LS125 (<strong>Apple</strong> p/n: 305-0125)2003 (<strong>Apple</strong> p/n: 327-2003)3470 (Motorola) (<strong>Apple</strong> p/n: 355-3470)3146 (<strong>Apple</strong> p/n: 351-3146)Capacitor C4:470 microfarad, 6.3 volts (<strong>Apple</strong> p/n: 125-6701)CAUTION:Be sure to turn off the power to the computerbefore replacing any of the components on theanalog card.<strong>Disk</strong> ][ Analog Card rev Jun 84 Page 5.3
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