Vintage Synth Repair

The factory sounds are available for free from Roland's website- in fact, the entire existant lot of factory patches for early MIDI Roland synths is there in sysex form. You'll need MidiOx and a MIDI interface to do the job. Your battery needs replacing, it's a standard CR2032 and is in a slide-out holder rather than being soldered in. Download the owner's manual while you're at the Roland site. Hope this helps. Bought my U-20 new in 1989 and still use it- doing so later tonight, in fact.