hifi engine

Yamaha c2 preamplifier


I am looking for service manual of c2 preamplifier or schematic diagram
Thank you for answer or internet adresses
I already have owner manual

Yamaha C2 Service manual

I'm also looking for this service manual and the C2a and C2 pre-amps are deviating too much with the original C2.
Thanks in advance.

Other source

Maybe the C2-A can be very similar. It can be found on other sources.