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 Post subject: Re: DC effects loop mod
PostPosted: Tue Feb 09, 2010 11:34 pm 
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Mark II

Joined: Wed Oct 01, 2008 1:22 am
Posts: 144
hmm if someone could send me the file with the directions for this it would be great, and I would be forever grateful! I would just follow these directions, but on my DC-3B there are no orange wires at all from the send jack! of course mine is set up so that I can't follow the simple directions haha


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 Post subject: Re: DC effects loop mod
PostPosted: Fri Feb 12, 2010 3:25 am 
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Mark II
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Joined: Sun Jan 06, 2008 5:35 am
Posts: 59
Location: UK
Just followed the instructions but haven't had time to test it out yet

Could you not leave the second orange wire (the one to the board) and the red wire in place on the mix pot?

Then you could still use the mix pot

Or am I missing something...?

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 Post subject: Re: DC effects loop mod
PostPosted: Fri Feb 12, 2010 7:12 am 
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Donating Member

Joined: Sat Oct 01, 2005 2:27 pm
Posts: 5447
Location: Maui Wowee!
Well...the point is to bypass the Mix pot altogether so that all of your signal flows through the FX.
Otherwise, you are missing out on a lot of great delay and chorus sounds that are getting lost or covered up in the Mix knob.

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 Post subject: Re: DC effects loop mod
PostPosted: Tue Jan 26, 2016 12:32 pm 
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Bottle Rocket

Joined: Wed Jan 06, 2016 3:03 pm
Posts: 11
I never found a complete how-to for this and had to figure it out for myself, so here's the deal...

At first, I just removed the white wire from the pot and bridged the other two terminals of the pot with a jumper wire. But, as others have described, this caused the amp to go silent if the loop wasn't in use. If this is all you do for the mod, then you have to use a cable to patch the send and return jacks together. The solution is to move the bare wire that comes from the positive "no-plug-inserted" side of the return jack so that it connects to the positive terminal of the send jack.

So here's the complete how-to for the FX loop mod:

1. Remove the white wire that goes to the mix pot and tape it off. This wire seems to connect back to the FX send positive terminal, but it goes through the circuit board in-between for some reason.
2. If you're leaving the mix pot in place, just put a jumper wire between the orange wire and the pink/red wire on the pot to effectively bypass the pot. If you're removing the pot, connect the orange wire and the pink/red wire. The red/pink wire is the positive lead from the FX return jack (from the side of the jack that's active when something is plugged into the jack). The orange wire goes to the power amp.
3. At least on my early 1991-ish DC-5, there's a bare wire coming from the FX return jack that normally meets up with the orange wire at the mix pot's middle terminal. Move this wire to the positive terminal of the send pot. This wire is the alternative route of the FX return when there's nothing plugged into the jack. When there is no plug in the return jack, the jack bridges that no-plug-inserted positive terminal to the plug-inserted positive terminal (which is where the pink/red wire is). So when no plug is inserted, you now have a circuit connecting the send positive terminal to the pink/red wire, which connects to the orange wire, which goes to the power amp. So we now have a proper bridge between send and return for when nothing is plugged into the loop. No patch cable required.

Enjoy.


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