Repair Roland MC-4 Microcomposer Reparatur

3. November 2019

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Repair Roland MC-4 Microcomposer Reparatur

Roland MC-4 Microcomposer. Switch buttons didn't work well. Two notes from my side: 1. Pay attention to the display.

This is a Vacuum Fluorescent Display. So pay attention to the neck of it. It can easily break the glass when servicing the pcb. I double protected it and never let it sit flat on the bench !

2. The original switches can be refurbished. If you use replacement switched (like in this unit) and if you want to keep the original metal support frame, you have to desolder these from its small pcb. Otherwise they won't get thru the metal. When you put them into the MC-4 look that they line up straight with the front. Looks aweful when one is sitting more right, the other more left. Otherwise nothing special here. Some surface rust, missing knob...

Caution

There are lethal voltage exposed in electronic devices. Unless you know what you are doing, don’t try this. If you following along, you doing so at your own risk.

I’m documenting repairs for my reference and yours. I do synth restorations and repair with a specialty in vintage synthesizers, drum computer and other vintage gear, based in Düsseldorf, GER. Get in touch about your synth situation!