I just got a slightly used, old K250. The price was right, but it clearly has suffered from sitting for a while. When first powered up (it was cold, just brought in from an unheated storage building) it somewhat worked, with some dead keys. I got tired of playing and did some other (real) work. Came back into my office and turned it on again and it's not really working at all now (all keys are dead, I do get random buzzing and other noises in the headphones) but most buttons (perhaps all) don't respond at all. I am an electronics expert (not a music expert, but want to learn to play...) I need a service manual for the K250... That would make diagnostics much easier. At this point I'm sure that every connector inside will need to be cleaned, but I've not opened it up yet. (The failures and what it is doing are classic bad connections at the boards...) So source for service manual? Download would be best, rather than trying to buy a paper manual.
