I’ve acquired an old clone theory. The circuit board is labled MA7FR.

It hasn’t worked properly since I acquired it. Here is what was happening and what I’ve done.

When engaging the switch, a loud POP came through my amp (I figure a blown DC Coupling capacitor.)

So I bypassed the switch to aid in diagnosing.

Now I plug in and there is a huge difference in signal volume between running through the clone theory, and direct guitar into my amp.

I guess what I am looking for is an accurate schematic. I have a knowledge in electronics, but little practical experience, and as such would appreciate any help you can give in helping me diagnose this pedal.

Thank you in advance.
dcs