aus den Bereichen
Ton- und Webdesign

Technical stuff, in english und german. This might range from audio tools to Drupal modules. Enjoy.

Yamaha RX7 Repair

I acquired a Yamaha RX7 drum machine for just a few Euros a couple of days ago. The RX7 was released in 1988 as a follow up to flag ship RX5, lacking single outs and dedicated faders but with much more 12-bit sounds on board. That's why I would consider this machine "the" Yamaha drums from the eighties you'd want to have.

box full of worn out keys

This is a write up from my work shop point of view, to help you make decisions when you consider buying a digital piano, whether new or second hand. I have serviced pianos from all kinds of brands, expensive ones, cheap ones. Here I share some experience.

Korg EC150

Lately I have had a Korg concert EC150 for service. This piano had one major issue, it was silent. Not even the slightest hum from the speakers nor on the headphones while the panel seemed to work just fine. So my first guess was it's either the power amp section or the corresponding power supply. Sadly, there is no service manual nor schematics available on the internet for this digital piano...

removing button knobs

A blog post showing you how to remove even very firmly fixed knobs. First of all – most potentiometer knobs can be removed by just pulling with two or three fingers. Don't use pliers to prevent damage to the knobs. If pulling with your fingers is not enough go on reading.

Roland TR-727 + TR-707

When I bought my TR-707 it was not in a good shape and had several problems and issues. The Rim button and four of the step sequencer LEDs weren't working at all. The output of both Ride and Rim/Cowbell were at a very low level and barely hearable. Additionally, some of the faders were crackling. The housing was not light grey but dark with sweaty black dirt all over.

Kawai Digital Piano P360

The Kawai P 360 (or Kawai Digital Piano 360) was introduced in 1988. It has a wonderful hammer action keybed with 88 wooden keys and features 13 tones from Grand Piano to Brass and Strings.

Repair: Korg LP-10

The LP-10 is an early E-Piano/Synth hybrid built by Korg in 1980. It features three on/off combinable sounds (Piano, E.Piano, Clav, which means roughly Sine, Square, Sawtooth), full polyphony, an equalizer section or filter bank with 6 bands adding/subtracting nicely to the sound, and a speed adjustable chorus.

Kawai PN80 E-Piano Reparatur

Since there is no service manual available on the internet by the time of writing this blog post I thought it might be a good idea to sum up some recommendations. This writeup is about a PN 80 but applies to all pianos of the PN series (like PN 60, PN 70, PN 81, PN 90 and PN 100), since they use the same hardware, basically.

Die Einbettung von Youtube-Videos ist seit der endgültigen Einführung der Datenschutzgrundverordnung (DSGVO) am 25.05.2018 etwas aufwändiger geworden. Das liegt daran, dass Verbindungen zu Servern in den USA erforderlich sind, um diese Videos abspielen und aus Youtube-Sicht Cookies auch von Drittseiten gesetzt bekommen zu können.

Einer meiner heimlichen Schätze ist ein Vermona E-Piano, das längere Zeit seiner Aufarbeitung harrte. Im folgenden beschreibe ich die kritischen Punkte und was ich wie gereinigt, geklebt oder umgebaut habe. Teile dieser Arbeiten sind auch auf Vermona Orgelmodelle und die Piano-Strings übertragbar.


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