hifi engine

Akai GX-747 Schematic

Wondering if anyone has a clean copy of a GX-747 schematic in full. Online service manuals don't have the audio preamp/processing schematic and the only ones I can find are washed out to the point of not being legible. I'm going to attempt to troubleshoot a record problem (low audio left channel in both directions) and want to make sure I've got a good road map. Thank you!