OK IC1 had a bad contact....Now I hear slight bleed through which is annoying because I can't find the problem yet.

Anyone..??

Ms20's are very reliable and you can get most of the parts still...The jupiter 8 is also well made.

OK....it's the battery board but has anyone else had this problem and where to look first.

The lfo is modulating when the amount is down..

Certainly the battery board ... the traces are fine around the usual suspects...????

Just a bad contact somewhere....Push the connectors in first.

First or second versions are the same except for the filter....And they don't sound that dissimilar (I have both)

I am still looking into the problem, When I know more i will post it here..

maybe worth going over the solder joints if it gets hot there..?

Now I have fitted the 2N3904 and BC139 it is working again except the small pulse wave on osc one...

It's a very interesting synth , Sounds like nothing else i have .

And A BIG THANK YOU to Deeplodok for his invaluable help...cheers mate..
And also to solderman....

MS-10 would be perfect.....Or a pro-one at a low price...

Are those boards still available..?

I have never seen the cpu chip go down ..

Not the mod just the diode that is there....I am sure if you really took your time it will work again.

The diode keeps the battery voltage to the RAM next to the junction on the left.

Always replace the ic 31....Sometimes the acid soaks into the board.

You have to give it a bloody good clean....

Yes it does feel like an op amp problem....

Rhino is spot on ....I have fixed 12 polys and you have to recheck the traces..

Clean the board with pure alcohol on a toothbrush...Clean it off with cotton buds.

If the lfo light is always on it' makes me wonder about the power supply....Anyway it's normal to start from the power supply.
try the last post ..plus Check the noise outs on the patch bay..?