From Kenny Balys Sent Mon, Apr 15th 2019, 14:26
From Kenny Balys Sent Mon, Apr 15th 2019, 14:26
I am going to feed this thread for posterity. So it turns out the DR-110 is stuffed full of super rare and extremely expensive transistors. Knowing this, I am going to snap up everyone of them I see for $40 (ha ha ha... joke) The atari noise sound I am hearing is the digital white noise: gorgeous texture, perhaps I should add an output for it? Its pretty clear the big kick sound on the clap is the first trigger envelope working correctly. So Q16 is working. The secondary trigger envelope is open wide. This makes me suspect the transistor Q15 or the cap C49. Parts: Q15, Q16 - labelled 11544F, part 2SA1115-F possible replacement NTE290A, PNP 50V, Hfe 250-500, TO92 package Q24 - labelled "60344F", part 2SC2603-F C48 - teensy weensy 0.47uF 50V polar electrolytic (height approx. 1cm) C49 - teensy weensy 1uF 50V polar electrolytic (height approx. 1cm) C50 - teensy weensy 2.2uF 50V polar electrolytic (height approx. 1cm) On 15.04.19 03:41 , Kenny Balys wrote: > > My DR-110 went mad an hour before a show. Scary, could > have happened on stage. > > Now I have it on the bench. > > The clap currently sounds like a kick and there is a constant Atari 2600'esque > textured white noise super loud at all times. > > My guess is that this is part of the noise component of the clap sound. > > Anyone run into exactly this? Would love some tips. > > It must be a transistor that failed or a cap. > > Failing any tips, I am going to replace the E-caps: C48, 49 and 50. > > and then transistor Q15 then Q16 then Q24 with a test in between each. > > So much work for a $40 drum machine but I am very fond of it. >