This manual is the second of a three-text microcomputer service and repair series. This text addresses the training needs of "chip level" technicians who work with digital troubleshooting instruments to solve the complex microcomputer problems that are sent to them from computer stores that do not have full-service facilities. The manual contains 11 units. Each instructional unit includes some or all of the 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. (This teacher's edition contains materials suitable for reproduction and hand-outs to students.) Units cover the following topics: fundamentals of microprocessors; system architecture; microprocessor architecture and timing; tools and test equipment; busses, protocols, and handshakes; generic troubleshooting; and troubleshooting the Apple II, Commodore 64, IBM PC, Zenith Z-100, and TRS-80 microcomputers. (KC)