EDEN WT-405 DIY Project - no sound. Point me in the right direction?

I picked up the Eden WT-405 knowing that it had issues, but thought I might get lucky with some obvious fix (something I've done quite a bit of).

In testing it, I did get some suggestion of volume (very slight; so slight I may have imagined it). But now nothing.

All the lights works (Mute, DI buttons, etc. - Mains, etc.)

I cleaned the pots before testing, and checked for anything obvious in the way of burned components or "popped" caps. Nothing I can see.

So, now I want to get a little deeper into it and was hoping someone with experience with these might be able to shed a little light on known weakness, or areas to double-check.

I've recapped before without troubleshooting (testing), but would rather not go wholesale recap on this, if it's just the one (fingers crossed).

Anyone able to give me a few pointers, suggestions, whatever?

Ian
SF Bay Area

 

I can read a schematic, somewhat. I have no test equipment, and my understanding of circuitry is far below that of anyone with the least amount of training. My bent is more mechanical, but, as such, I've had success in minor electrical repairs when the problem is obvious, like a broken wire, etc. I have replaced capacitors and have made other repairs to equipment, but not without a nod to a bit of luck on occasion. As I say, I'm a hobbyist - a tinkerer.

I'm sure my best chances for continued success in a more in-depth way lies in furthering my knowledge and adding the testing of electrical circuitry to my skill set. I just haven't got to that point yet. But I do learn more and more with each new project.

In this case, I just picked up an amp with issues, hoping to find, as has happened in the past, issues that are either obvious to me, or become so with the help of those able to point them out.

Ian
SF Bay Area

 

There is an effects loop. Can you explain what this does, as far as troubleshooting? What would this tell me? What should I be looking to (hear?)?

Yes, without test equipment, I replaced about 11 capacitors on a KLH TT, and while I got it to work just fine by doing that, with test equipment (and the know-how needed to use it), I may have saved myself a little trouble.

I'll be opening this 405 up again for a closer look at anything that may be amiss, then I may send it in for repair, or sit on it until I'm better equipped to handle it as a DIY.

Thanks all for the input!

Ian
SF Bay Area

 

Updating this old post in case others might run across it and find it interesting (year and a half later):

I took this amp to a local tech, so it would at least have the benefit of a trained eye/ear. I do get that without some indication of what the issues might be, even a tech would be pressed with finding a starting point.

However, and it's the weirdest thing, the tech gave it an initial once over and found no issues! He kept it over night and updated me regularly about what he was trying and how he was testing, but found that the unit was operating as it should!

The person I bought it from mentioned that it was not working, and my initial attempts showed it to be not working. So I'm not sure what the issue may have been, but perhaps it was a bad cord or cable, as my tech suggested. Quite a coincidence that the seller and I both had issues (though, I don't know just what the seller was experiencing).

My tech pointed out that he'd read this old post and included a link, so I was able to review what I did a year and a half ago, and there may be this as some explanation: I see where I mentioned cleaning the pots before testing; this may have contributed to the issues, short term (if I was too liberal in my application of the control cleaner I used), but, what?, time allowed for the cleaner to dry?

At any rate, here I am with a nice little amp head, got for relatively little money, and all seems good!

Fingers crossed things remain copacetic!

Ian
SF Bay Area