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Ton- und Webdesign

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

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-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 built by Korg in 1980. It features three on/off combinable sounds (Piano, E.Piano, Clav), full polyphony, an equalizer section 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.

Millenium E-Drum Set: gebrochene Halteklammer Reparatur

Recently I found this very cheap (40 EUR) Thomann Millenium E-Drum Set paired with an Alesis DM5 Sound Module on a local advertising platform. I could not resist. The drum kit turned out to be really cheap in every sense, one of the clamps to hook up the pads broke right away when I tried to tighten it.

Roland D-50 Keyboard Repair

I had to open my Roland D-50 recently to fix some keys and switches, a problem very common to synthesizers of that age. While reassembling I noticed that the memory had got stuck somehow to patch 11. No other selection was possible.


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