Apple Service Technical Procedures Volume Six

This guide covers upgrading the Macintosh 128k, 512k, and Macintosh Plus. It covers ROM, hard drive, case, logic board, and floppy drive upgrades, repairs, and troubleshooting. Also covered in this guide is the Macintosh SE and Macintosh II, as well as their accompanying upgrades, repairs, and troubleshooting, and diagnostics. Both 400k and 800k external floppy disk drives, all keyboards, including the Numeric Keypad for the Macintosh lineup up until 1987 are covered and the Key-switches used for all keyboards and how to identify compatible switches.The Hard Disk 20 is also covered and the Apple High-Res Monochrome Monitor.