Roland JP-6

Here are some images of a huge Jupiter-6 restoration I did. The restoration included fixing the keyboard as it spontaneously triggered notes and some times played chords instead of single notes. Recapping of the whole instrument. Installation of totally new potentiometers, sliders and rotary pots. And Europa installation.

Removal of the keyboard. The keyboard triggering mechanism was cleaned mechanically with a dremel multi tool, some of the copper tongues where to close to the gate and cv leads, these where drilled with a small drill and pressed down by a screw so that they would not trigger spontaneous notes.

Some of the buttons had a "spongy" feel to them, the reason was this broken PCB which was set to place by changing the screws for ones with bigger heads.

Here is a broken button, note the dust covering the LEDs.

After cleaning the LEDs and buttons. The broken one was exchanged for a new one. (Thanks to Senso Vintageplanet.nl for selling these parts).

This is a final shot of the new button in place. A slight color variation to the old ones, but much nicer than the broken one.

Just making sure I get them all in place as they should.

Another shot of the cables and boards.

Front panel PCB and the old sliders and pots.

More of the unclean old pots. The only pot on the front panel PCB that is 10K is the balance pot between upper and lower patches.

Close up on the dirt.

Nice new sliders and pots in place. All slider values are 100K, the same goes for the pots except the balance pot.

The pot kit was bought from chip for brains on eBay. They have a perfect fit, just remove the old ones and snap in the new and solder them into place.

The pot kit may be expensive but I is totally worth it if you like your Jupiter-6 synth.

Here the front panel PCB is in place, the dust protection was removed because it had dried out and actually caused more problems for the sliders than it protected against dust.

The bender section also got new pots and sliders.

A close up of the new pots in place.

Recapping needed.

Old caps of the CPU board. The blue one near the CPU is a bipolar one, these can also be found on the voice and output board.

New caps in place on the CPU board.

Old caps on one of the voice boards.

New caps in place. The other voice board got a little more caps but it is essentially the same.

Old caps on the PSU card, note how big some are.

Here are the new ones are installed. The new ones are a lot smaller even though they are the same value.

Europa not installed.

Europa installed in its socket. This is the first time in my life I found use for nail polish (Used to make sure there is no contact between pins 19 ground and pin 20).

On the backside of the CPU PCB a few jumpers had to be installed.

The Jumper at R30 removed and the resistor installed.

Ready to ship back to its owner. Unfortunatley I got no pictures of the Keyboard fix.