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Roland System 100M power conversion transformer swap
MUFF WIGGLER Forum Index -> Modular Synth General Discussion  
Author Roland System 100M power conversion transformer swap
eptheca
I have a Roland System 100M M-190 rack for 3 modules.
It is made for the US (117V) and I am in Europe (240V)

Now I use it with a step down converter, but I would like to eliminate that and swap the Power Transformer (022H025C) to a equivalent one for 240V.

Have any of you done this, or know the specs of the transformers?

In the Service Notes is says the secondary windings ratings are 22V @0,7A DC
but when I measure the wires I get AC???
synthnut
Hi,

It's not too tricky to do. I replaced a 100V Japanese transformer in a 191J with a 50V/A 0/22V 0/22V toroidal transformer. The main issue is the different mounting needed for the torroidal compared to the E core with it's two flange mounts.
You can probably find a suitable torroidal on a certain popular auction site.
Obviously though this involves potentially deadly mains voltages, so if you are uncertain about anything, probably best to get it done by an experienced technician.

Gotta keep wiggling...

TTFN,
Ben

PS, have a couple of full 191Js going if you want to expaaaaaand ;-)
eptheca
Thanks Ben,

So there's probably just a typo in the Service Notes, and it should say 22V @0,7A AC

This guy looks like he's done what you have done
https://www.flickr.com/photos/60802576@N03/7175893678/in/photostream/

I'll look for one with those specs

Cheers, Hal
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