This guide provides instructions for preventive maintenance and for making minor technical adjustments on microcomputers. General hints are provided for all microcomputers concerning static electricity reduction; use of dust covers; heat, magnetic fields, and floppy disks; and the use of halogen fire extinguishers. These are followed by troubleshooting suggestions specific to Apple computers and their peripherals, including the Macintosh, Apple IIc, Apple IIe, Apple IIGS, and the Image Writer II. (GL)