jupiter4 power supply rebuild

The Roland Jupiter-4 and ProMars Compuphonic Analogue Synthesizer
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Joined: Thu Jun 25, 2015 4:33 pm

jupiter4 power supply rebuild

Postby transistor303 » Thu Jun 25, 2015 4:36 pm

where can i find a new tansformer to replace a old jap one. I have a step down converter but want to convert this jup to a us based machine. what voltages am i supposed to get on the red and orange taps?
on the test points i get +5 +15 and +.7

Posts: 2
Joined: Mon Jan 04, 2016 8:49 pm

Re: jupiter4 power supply rebuild

Postby JFunc » Tue Jan 05, 2016 12:16 pm

Hi there!

I'll open my Jupe later on today and measure the taps for you, if you like?

I've just done a rebuild of my power supply (although my xformer is ok). Look at replacing the large electrolytic filter caps on the power board. I would change out the regulators too, if you can be bothered, since you'll have the board out anyways, if changing caps.


Roland JP-4 - Juno 106 - RS-9 - TR8 - XV3080 - D110...
Korg 01/Wfd - Prophecy - M3R - Volcas...
Yamaha DX21 - SY85...
Casio CZ101...
Akai - MPC1000 - S950...

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