Last weekend, I found on FB Marketplace a pair of Roland D5 keyboards that were being sold as needs repair. Price was right, only $100 for both, so I picked them up. Surprisingly they both have the same problem, and less surprisingly, it’s a problem experienced and recorded many times online. The problem is the patches sound like the modulation wheel is perma-cranked. Online, they are described as "warbly".
Before I had done my research, the first thing I did was disconnect the pitch/mod wheel assembly and clearly, it didn’t fix it. I looked around the board and it didn’t look bad, but it seemed to have what I would call "suspiciously oily dust" on the circuit board. You know, it’s not dry dust. Although it didn’t look like the capacitors were leaking, they just seemed like they were carrying a little extra dust on their legs, which doesn’t happen with dry circuitry.
So I made the decision to recap the whole board and I made a parts list for anyone else looking to do it. While I waited for the parts, I did more research and found that yes, the warble is caused by one capacitor in particular – C49 – so I expect my complete replacement should solve that problem. Additionally, it’s a very common problem that the tactile buttons are worn out and should all be replaced. I ordered those parts as well. The volume slider is in pretty good shape so I won’t be replacing that.
Anyway, on to the parts list!
Tactile buttons:
38 of 6mm x 6mm x 5mm, 2 pin
Capacitors:
11 of 16v, 10u (C7, 8, 12, 15, 19, 24, 25, 28, 31, 35, 49)
5 of 25v 10uf Bipolar (C53, 69, 70, 76, 80)
4 of 16v 1000v (C2, 3, 4, 68)
2 of 50v 1uf (C45, 66)
2 of 25v 47uf Bipolar (C54, 60)
1 of 16v 100uf (C33)
1 of 35v 47uf (C78)
1 of 50v 4.7uf (C1)
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