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I don't see that anywhere on the internet either. A couple of ideas:
-there might be a schematic on the inside of the case. I have discovered service information on a sticker inside the set on many units from that time period. it's worth a check
- it's a pretty simple black and white set. you might be able to work it out without the schematic. from the mid 1970s, chances are you have a ton of bad or weak caps inside. you probably have some cold solder joints and/or dirty pots/connectors.
If you can do so safely and you know how to work on electronics with lethal voltages on them, just go over the set and see how it goes. Remove and replace any caps that test too low or have high ESR, reflow the solder, use contact cleaner on contacts and fader cleaner on all the faders.
This is almost certainly a hot chassis, which means there are mains level voltages present on the set when plugged in, so you would need an isolation transformer to do any troubleshooting with the set on.
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