Here I show how to remove the keys from the keyboard of a Korg Poly-61 and how to attach them again. This procedure should be the same for some other Korg synths from the same era, e.g the Polysix. The keys in this one were really dirty, especially on the underside so I washed them…
In this video I show how I repaired the joystick on my Korg Poly-61. It had been crushed during transport and pushed into the chassis so it did not work.
This Korg Poly-61 had issues with around 10 of the buttons where they did not generate any notes. The keyboard in the Poly-61 uses membrane buttons which have a rubber dome with a conductive plate which is pushed down on the circuit board. The conductive part tend to go bad over the years so in…
Replacing all push buttons on the front panel of a Korg Poly-61 as the buttons were very unreliable; some had to be pressed really hard and some of them generated multiple presses). I am using the dust sealed (IP67) Omron B3W-4050 buttons. The strems on these buttons is ever so slightly thicker than the orignal…
My banged up Yamaha DX7 needed a new display as it was a bit dim and I also wanted a backlight I did not want to pay €20+ for a new display kit. In this video I show how I did this. Perhaps this would have been easier to just buy a kit but I…
In this video I replace the old keybed felt which sits on top of the aftertouch sensing strip in my Yamaha DX7 and then calibrate the aftertouch. The keys hit this felt when they are pressed and then push on the aftertouch sensor strip. As it was worn out some of the keys hit directly…
In this video I replace the Yamaha DX7 power cable with a IEC C8 socket (If you are going to do this please be VERY careful as this is 110/220V and it can be very dangerous). It seems to be quite common in the DX7 that the cable, which is mounted directly in the chassis,…
This Access Virus Rack was continuously restarting when power was connected. This is apparently a common issue with the Access Virus and is due to a capacitor in the power supply going bad. In this video I replace said capacitor. I didn’t have to do any real troubleshooting here as there were various references to…
I bought this Roland TR-505 as “for parts/repair” as it didn’t start at all according to the seller. After a little investigation it became clear that it did work on batteries and it was just the power connector on the main board that had issues. One of the pads the connector was soldered to had…
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…
