Vintage Synth Repair

Hi guys,

Would anyone know a source for (free) Yamaha service manuals or schematics please? I just called them and asked - but they say they don't keep them, which I find hard to believe.

I have had success in the past with other companies who are only too willing to dig one out and email it to you, but Yamaha seem not that helpful.

I'm looking for a schematic for a really old Yamaha Compressor - GC2020B

Cheers,
TOM