Guy Wilkinson's P0004 power supply is an established upgrade for many JX-10 and MKS-70 owners but few may be aware that it works just as well as a Roland JX-8P replacement power supply.
The P0004 runs cooler, is more efficient, more stable and considerably more reliable than an aging original Roland power supply.
Having worked for the company, I have to say that I've always been a fan of Roland's power supplies. People use the term 'unreliable' but the truth is that they've been working in thousands of instruments, for absolute decades. The problem is, how much longer can they last? 🙁
Vintage keyboards are now a collectable thing. Why would anyone risk a power supply failing and potentially bricking a gorgeous synthesiser?
Guy's well-designed and established P0004 addresses such concerns, as well as providing benefits such as universal power. Yes, that's right. The P0004 replacement power supply for the Roland JX-8P will work on virtually any mains voltage across the world. You don't have to switch transformer taps or use an external step up / down transformer, when moving your gear from one country / region to another.
In both images, you can make out that my Live Forever battery upgrade is also installed in this particular JX-8P. A smart little upgrade, you won't have to worry about losing your memory (?) or a leaking battery for a long, long time. 🙂 In fact, this JX-8P also has my AT-JX-8P replacement aftertouch sensor for the Roland JX-8P installed, giving it a whole new lease of life.
If you're having mains hum issues, the P0004 might fix things for you. The P0004 is a modular switched-mode design and doesn't generate hum like linear power supplies.