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Ton- und Webdesign

Technical stuff, in english und german. This might range from audio gear repairs or mods to Drupal modules. Enjoy.

Yamaha EMP100

Repair of a Yamaha EMP100 Multi-Effects Processor from 1991 with E2 error message on the display, as soon as you switched on. The service manual pointed to some External RAM error which sounds strange since there is no cartridge slot or something for external RAM. Digging a bit deeper reveals Yamaha refers to the user RAM.

Roland SH-101 Repair

A detailed guide of how I resolved a couple of issues with my Roland SH-101 synthesizer. Biggest problem was – no sound except for filter resonance. Some of the faults of my machine are described in other places on the net but a good bunch of them lacks resolution. So read on to find out what I did.

Fireface 800 Circuit

People are asking how to solve dead, noisy or blown mic pre-amps in their RME Fireface 800. Problem seems to be connecting and disconnecting microphones while +48V phantom power is switched on. Here is how I solved this.

FloC Flow Chart

FloC (Federated Learning of Cohorts) ist eine neue Art, wie Google das Tracking von Individuen, bzw. deren Browsern organisiert, um auch ohne Cookies gezielt Werbung ausspielen zu können. Ich habe mich gefragt, ob man verhindern kann, dass die eigene Webseite zu dieser Kohortenbildung beiträgt und siehe da – ja, über einen entsprechenden HTTP response header.

Custom pedal stand for digital piano

If you have a Yamaha Digital Piano or Keyboard and need to connect a Damper Pedal that is of type "normally open" [NO] instead of the Yamaha type "normally closed" [NC], here is what I did to a Clavinova CLP-200 to make a pedal bar with reversed function and no reverse switch work.

Korg C-35 Reparatur

Anleitung zur Mainboard-Reparatur bei Korg C-x5 Digital-Pianos, bei denen die SMD-Elektrolyt-Kondensatoren mit der Zeit schwächeln, worauf sie oft erst leiser werden und schließlich keinen Ton mehr von sich geben.

Yamaha RX7 Repair

How to solve mechanical problems with the buttons of a Yamaha RX7 drum machine. The button technique is basically the same in a variety of Yamaha machines from that decade, so solutions described here may apply also to RX5, RX11 and RX15.

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.


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