Hi guys I have a JEN SX-1000 which currently makes no sound what so ever. Here is the story so far:

Bloke I got it from said he replaced the M110 but still no sound...

I got it home and yep no sound but powers up.

I opened it up to find A LOT of the ribbon cables were plugged in back to front!!
I re-plugged all these the correct way round, powered it up and checked that the PSU is ok with a volt meter. All good

When powered now, no audio output BUT you can faintly hear in the background an oscillator which changes pitch when you move the tuning knob on the front.
This is free running, I can't quite remember if pressing the keys changes pitch too as it's been a while since I last turned it on.

This is about as far as I have got. I have access to an oscilloscope and I also have a volt/ohm meter. My electronics isn't very good any more and can barely remember my Logic as I haven't done anything like this in years.
Some one suggested to start looking at the M110 first with the oscilloscope but I'm not sure what to look out for

Can any one help out?

Thanks

Edited by vinyl_junkie (17/03/12 01:40 PM)

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