February 2020 – The Imp of the Perverse

Yamaha DX7 – Damaged Power Cable Replacement

2020-02-232020-02-23 Laban

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…

Roland Jupiter-4 (JP-4) – Battery Replacement (CR2032)

2020-02-222020-02-22 Laban

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…