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drasp
Copper Member
USA
17 Posts |
 Posted - 06/27/2008 : 03:17:17
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Howdy again! I'm back with a 2nd DOA DD-3. It's another early one w/ the full-width chip & big AC jack. I repaired a similar (slightly earlier, same version) pedal for a friend from another forum (ShortScale.org) last month and it was all due to help from you folks. I'm hoping for another success as I've bought this one for myself!
This pedal passes dry signal through both outputs just fine. LED comes on normally, even correlates to the hold function vs. S,M,L delay times - I'd guess that means it's switching modes correctly. The pedal had a greasy coating of something, only a little made it's way into the body of the pedal. I cleaned it all off with a light application of contact cleaner. Also, the pots were physically sticky & so I sprayed them w/ contact cleaner as well. Light corrosion on some of the solder joints on the back of the board, but nothing worse than I've seen on many other 100% functional pedals. Not sure how to re-touch joints like this as nothing seems to make solder flow back into them. . .
Any guesses on how to test for why there is no effected signal? |
Edited by - drasp on 06/29/2008 21:03:03 |
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drasp
Copper Member
USA
17 Posts |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 06/29/2008 : 23:43:34
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Clean it off some more with some isopropyl alcohol (rubbing alcohol) and a toothbrush.
It'll break down the grease and remove it.
Some of your tracks maybe corroded off and is causing an open.
'Pecially north of the NE5701 opamp. Lower left in the solder side pic. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/30/2008 : 05:49:32
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| Yeah... definitely looks like maybe a ground break from corrosion in the lower left of the pic. |
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Mesjoggah
Gold Member
Netherlands
595 Posts |
Posted - 07/24/2008 : 18:01:44
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Today i bought a DD-3 pedal with the exact same fault, i took a toothbrush and cleaned the solder side of the board, after that i tried the pedal but it didn't work so i decided to spray some contactspray on it, it came back to life immediately!!
Now i've got a very cheap working DD-3! (we'll see for how long but at this point it's working) |
Edited by - Mesjoggah on 07/24/2008 18:29:36 |
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Topic |
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v1 DD-3, LED Lights up, Passes 100% Dry Signal
