Macintosh LC 520 Developer Note
Download it here: Macintosh LC 520 Developer Note.pdf
This is Apple Computer's own developer documentation for Macintosh LC 520, published in 1993. It covers the all-in-one enclosure, the built-in Trinitron display and its timings, the processor-direct slot, the CD-ROM drive power budget and the sound subsystem.
Apple's developer notes are a different document from the Service Source repair manuals: the Service Source tells a technician which module to swap, while the developer note gives the electrical and architectural detail — rail currents, connector pinouts, power budgets and chip functions — that a repairer needs in order to make a go/no-go measurement. Several figures on this wiki are cited to this document.