This Roland JP-4 had one voice board where the filter behaved differently. I had gone through the entire calibration procedure in the service manual but I could not get the VCF Envelope Balance correct. The other three voice boards had no issues. When calibrating the board in question I just could not get it into...
Repairing a broken key of a Yamaha DX11. The key did not spring back up when pushed. This was due to the plastic in the key having snapped and the steel spring had detached. It is quite common that the plastic in these old keyboards becomes brittle over time. If the issue in the video...
This Yamaha DX7 did not power up. I thought that it was due to one or more fuses being blown but they had not. After a while I discovered that the power cable was broken internally close to the chassis. This was probably due to the cable being sharply bent there many times over the...
In this video I will be replacing the original NiCad battery in a Roland Jupiter-4 (JP-4). This kind of battery is prone to leaking which can cause problems. In the JP-4 this is not an very big issue (at least compared to e.g. Korg Polysix where the leaking battery will cause havoc and damage traces...
This Waldorf Pulse 2 had been dropped and this had cracked the dispay. I had hard time finding the original screen (Powertip PE12864WRF-004HC1Q) as it seems to have been discontinued by the OEM. I found a post on Elektronauts where a user, “infekted”, had replaced the screen with another one successfully. Unfortunately it was not...
I have a Yamaha RM1x where some of the buttons were quite bad. I decided to replace all of them while I had it open. A couple of the encoder and the volume cap was missing so I replaced these also. The soft buttons were Omten D3XJ and I bought these from a vendor on...
Updating the firmware via MIDI SysEx to the latest version I could find (v1.028beta). Used “Syxex Librarian” in MacOS to do the transfer but MidiOx on Windows should work fine also.
Fitting the E-Licktronic Nava in the metal case. Had minor issues with the scale LEDs not fitting properly due to the holes being too small. I also had some issues with the back screws as the spacer was off some fractions of a millimeter. Later on I managed to bend these slightly so the screws...
So we’re getting closer to the end of this project, hopefully, here I solder the master section and I try to power it up for the first time and see if I get any sound at all from it.
