Stub Mandrel Posted 19 hours ago Share Posted 19 hours ago NECRO-THREAD ALERT! I got a stylophone in a charity shop. The batteries had died unpleasantly but I cleaned it up and replaced the positive wire. But it's doing odd things. The notes don't all come out as the correct note. Not tuning errors. Black notes in brackets: A (A#) B C (C) D (C) C# F (F#) G (G#) A A# B (C#) D (D#) E Except sometimes notes swap, especially if you go back and forth. Sometimes they are way out. It's not like shorts between two keys making them the same - more like it detects the actual key but assigns the wrong pitch. Any ideas? Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted 19 hours ago Share Posted 19 hours ago AFAIK, the stylophone uses a resistor network for pitch, so it would have to be a shorted board or shorted resistors on the board. Did you buzz it out? Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted 18 hours ago Share Posted 18 hours ago 40 minutes ago, Woodinblack said: AFAIK, the stylophone uses a resistor network for pitch, so it would have to be a shorted board or shorted resistors on the board. Did you buzz it out? The 2007 reissue doesn't use a discrete resistor ladder, instead the 'keys' appear to go to an on board chip: Not my photo... I dont know what goes on inside the black blob, could be a resistor network or a custom chip. Quote Link to comment Share on other sites More sharing options...
tauzero Posted 18 hours ago Share Posted 18 hours ago Might be worth getting one of those watch polishing cloths mentioned in the polishing up yer frets thread and cleaning up the keypad, in case there's some mucky bits - I think, as @Woodinblack says, it's a resistor network so stray resistances will mess it up. Incidentally, there's a reddit group for it (just happened across it in a search). Might be worth a look. Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted 18 hours ago Share Posted 18 hours ago Oh yes, I suppose that is cheaper these days to have a custom IC. Still the only thing that could produce your results is some kind of board issue. Maybe battery acid dissolved it? Quote Link to comment Share on other sites More sharing options...
Stub Mandrel Posted 18 hours ago Share Posted 18 hours ago It seems the 2007 model is digital and plays sampled sounds. Looks like the chip is decoding key presses wrongly. I can't find any shorts or see corrosion. Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted 18 hours ago Share Posted 18 hours ago 13 minutes ago, Stub Mandrel said: ... I can't find any shorts ... You're not trying hard enough ... Shorts ... Quote Link to comment Share on other sites More sharing options...
tauzero Posted 18 hours ago Share Posted 18 hours ago 24 minutes ago, Dad3353 said: You're not trying hard enough ... Shorts ... Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted 17 hours ago Share Posted 17 hours ago It is unlikely (unless damaged by power surge or something) that it would have a fault in the IC, but there isn't much else going on there is there? Quote Link to comment Share on other sites More sharing options...
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