Roland JP-8

This JP-8 service included, recapping, Keyboard cleaning/repair, tactile switch replacement and installation of an Encore electronics midikit.

Potentiometer- and slider knobs removed.

The JP-8 is massive inside, cards upon cards and a lot of wires. Notice the big PSU caps.

Controller board 1 of 2

Voice card 1 of 4

Another voice card picture, have to document how the wires are attached.

Front panel PCBs

A lot of wires from the front panel controls.

Front panel PCB

I don't know if this is Roland standard on all JP-8's but this one has had one of the multi wire connectors removed and soldered directly to the PCB. I restored this to a more comfortable standard for us techs. Another multi connector was soldered into place for quick removal of the keyboard should it be needed in the future.

The PSU of the JP-8.

The big caps in the PSU which where replaced.

Dust from the past.

Keyboard needs cleaning.

A lot of dirt made this JP-8 double trigger notes, some of the copper tongues where bent towards the bus bar so hitting that key would make the tongue bend so much that the connection would become bad between it and the bus bar

Here is a before picture of the button section of the JP-8

Collection of dust.

De soldering the buttons first makes it easier to remove the button and it's housing from the tactile switch mechanism.

Close up of the old tactile switches. These are standard ALPS parts that are called SKCAB by ALPS.

All tactile switches removed

The new tactile switches in place.

The new switches made it like new when selecting patches

Old caps.

New caps.

Voice card in place.

Another picture of the old caps.

And new.

And finally a picture of the installed midikit from Encore electronics. Here you can also see the new caps of the PSU and new memory backup battery. I personally don't like when all ins/outs are at the back of the synthesizer so here I chose to install the midi in and out on the right hand end bell. You might notice that the big PSU caps are much bigger in terms of size. Installing them required re drilling holes into the PCB and moving some PCB traces by cutting them and reconnect them with wires.