“vintage used Yamaha DX7 Synthesizer. AS IS – This synth is funcitonal but losing presets when powered off – requires a new RAM 1C chip, upgraded ROM card, or MIDI operation. See notes from repair tech below –
Serviced for sale 9/9/24 –
Changed battery. Cleaned. Changed out D4 diode. Reloaded factory presets. Still losing
presets internal presets 1-16 after unit is turned off. RAM IC chip responsible for this no longer available.
But all internal sounds (plus hundreds more) are available via MIDI or on upgraded ROM card.
Tested #4 preset card included with unit-working good.” Click here to visit listing on eBay