Built myself a BD2 clone but the thing is obnoxiously loud past 1/3rd of the volume pot. The gain and tone are sounding proper (albeit maybe a little dark), but there’s no way the output on this thing is naturally this loud. I’ve tried swapping the volume pot for a lower value and adding a resistor in series, but that didn’t seem to work. Am I missing something? Somebody help me lol.
A friend of mine gave me a Casio Sk-1 to repair, so I run my usual routine. Power it on, it’s making some horrible pissy noise, open it up and start investigating. Some of the caps looked suspicious so I changed them all out, still no change. This is where I start getting worried.
See, my friend didn’t have the original adapter. My guess is they powered the thing with a 9v pedal power supply and fried something inside. I’m crossing my fingers that is ISNT the CPU, but the more research I do the more I’m worried it might be. Here’s what’s wrong with it, and what I’ve tried:
- No sound, occasional spurt of random digital noise.
- Power LED lights up, flipping the switch to the off position does NOT turn the unit off
- Unit does not respond to any button or key input whatsoever
- recapped the whole unit
- removed and tested transistors T7 and T8
- inspected the CPU traces closely for any minor breaks and tested for continuity
- Measured Voltage at CPU and its receiving 3.1V, I’m guessing it needs somewhere around 5V
Somebody help me out here, I’m beating my head against a wall.