I'm trying to use the effects loop on my 212 VK combo, but I can't seem to get a response. I tried running an EQ through it. I hooked up a cable to the send signal, got nothing at all. hooked up another cable to the return signal into the input of the EQ and got a very quiet output with a lot of signal distortion.

any help here? not affluent with effects loops.
Jumping Jax Champion 1965!