I also finished cleaning another circuit board in addition to the button board I fixed.
I cleaned all the potentiometers thoroughly because they were dusty and sticky as hell. And then I used contact spray again, to improve the function and accuracy of them. I reinstalled the board, and one can see the clear difference between the restored and the still dirty board 😂

More progress on my JD-800:
I had to replace some of the control buttons because the didn't work properly anymore.
I ordered similar looking switches on AliExpress, but turns out that the pinout is different.
So I had to hack around that and solder small copper legs to the contacts and reroute them to fit accordingly.
#roland #jd800 #synthesizer #restauration

Another problem was the rotary encoder for the waveform select. It just jumped randomly when turning. So I took out the encoder and literally flooded it with contact spray. I turned it a bit, and boom: Works like new!
#rolandjd800

Then I started disassembling the control panels because some of the buttons don't work, or don't work all the time. I wasn't able to fix them by applying contact spray, because they are soft press rubberdome/membrane keys...
So I ordered some on AliExpress which look similar. Now i have to wait...

Then I also had to fix the keyboard membranes because the upper half did not trigger correctly. I used #WD40 specialist contact spray. It works great now!

First of I had to clean every key and reglue the weights. In addition i sealed it with epoxy to block the red glue rests from dripping out again.