Roland Jupiter 4 Vintage Analog Synthesizer

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via this auction

Interesting pic of the voice boards inside, further below.

"This Roland JP-4 has just been serviced to ensure another lifetime of reliability.

Service notes include (12/01/22):
- Installing CHD Midi 2.0
- Recapping and rebuilding PSU ✅
- Converting PSU to US Voltage ✅
- Recapping all electrolytic capacitors on all boards ✅
- Cleaning and lubricating all pots and sliders ✅
- Cleaning all I/O jacks ✅
- Cleaning all switches and contacts ✅
- Replacing old Nicd battery and with new modern user-replaceable coin cell cr2032 battery
- Revising battery charging circuitry in JP4 for lithium battery.
- Calibrating all 4 voices ✅
- Calibrating synth to factory specifications ✅
- Testing for a burn-in period of several hours to ensure best possible functionality ✅"