This manual is the third of a three-text microcomputer service and repair series. This text is designed to assist instructors in teaching service and repair procedures for floppy disk drives, printers, and monitors. The manual contains five units. Each instructional unit includes some or all of these basic components: performance objectives, suggested activities for teachers and students, information sheets, assignment sheets, job sheets, visual aids, tests, and answers to the tests. Units are planned for more than one lesson or class period of instruction. Topics covered in the units are introduction to peripheral repair, and servicing and repairing dot-matrix printers and letter-quality printers, computer monitors, and floppy disk drives. (KC)