[sdiy] SL880 Pro problems

[Michael Kelly]

OK, some good news, if slightly embarrassing. The main issue was due to a problem further up the chain in my midi I/O box and with a reset the SL880 is now working as expected. BUT I have managed to fix the issue with the constant volume messages by cleaning up the board joints and contacts. I will turn my attention to the pitch bend now, as it’s still dead, but hopefully shouldn’t be too difficult to fix.
Thanks for the help and suggestions.
Mike

> On 6 Nov 2021, at 21:04, Mike Kelly <mike at downlode.uk.net> wrote:
> 
> Hi, I wondered if anyone has experience in troubleshooting Studiologic SL880 midi keyboards. I picked up this one second hand and really like the weighted action.
> Since the off there has been a problem with some rogue midi output signals. Plugging a volume pedal into the volume socket seemed to solve it. Now however after a couple of years of use I am getting random and unstable outputs and it’s unusable. I tried changing a couple of the electrolytic caps as I had spares. The board generally looks OK and the settings functionality and the LEDs all seem to be working fine, so I think there’s not much wrong with it. If anyone knows a likely point of failure on these boards please give me a shout. 
> 
> I thought about replacing the crystal as it looks a bit aged. Marking is 24.0MHz, HCJ-30 02-02-57. Would any 24MHz crystal do? Or am I on the wrong track.
> 
> Alternatively if there’s a way to put a whole new DIY circuit in there I could go that route. They’re Fatar keys I believe, with aftertouch.
> 
> Thanks.
> M
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