Identify schematic for an audio receiver, probably Pioneer

[hanakp]

I got a schematic of some (probably) audio receiver, but there is no type or manufacturer identification. I googled the assemblies and it seems it's a Pioneer product, but I couldn't find the type. All schematics are in long paper strips, maybe 25x80 cm. I'm attaching one of them. Thanks.

[squadchannel]

Pioneer A-7
https://archive.org/details/manual_A7_PIONEER/page/6/mode/2up