Troubleshooting and Repairing Your Commodore 128 by Art Margolis is a detailed hardware repair manual for the Commodore 128. It explains how to diagnose problems by symptoms, disassemble the computer, locate and replace chips, test logic circuits, troubleshoot memory, video, sound, I/O, clock, bus, and power-supply issues, and use test-point charts and schematics to track faults.