Black Jupiter 2000 Function generator circuit.

[Yorkie]

I notice from the datasheet that the service manual didn't come with the Jupiter but was listed as an optional extra, so might not be very commonplace, but hopefully one will turn up. Without a circuit, a few preliminary checks could at least be made - for example, the voltages/ground connections of the ICs. Given the era in which it was made, though the blurb refers to it using a 'microprocessor' I wonder if it used the then popular but long since obsolete 8038 waveform IC? If so, they do sometimes turn up on internet (eBay etc). Any electrolytics may by now have high ESRs but whether that would stop it working is debatable.

There is a schematic available FOC from this site, but you have to register to get it, but I know nothing about the site - 'ride at your own risk'!:

http://documentsearch.org/pdf/black-star...matic.html

Best of luck in your quest John.