Re: 1541 drive from 117V to 220V

From: David Wood (
Date: 2002-06-13 00:18:42

On Wed, 12 Jun 2002, Daniele Gratteri wrote:

> and I noticed that, on the 220V one, the FUSE is connected to a red and to a
> black piece of cable and that a black cable is free. Instead, on the 117V
> unit the FUSE is connected to two black cables from the PSU and the "free"
> one is red.
> So, if I exchange the cables connected to the FUSE holder, can I
> successfully convert a 117V unit to 220V? If yes, should I change the 500mA
> fuse with a 250mA fuse like an European drive?
> Or a drive modified in such a way will definately be like a bomb? ;-)

I've noticed that before with US 1541's.  I'd borrow a friend's multimeter
and measure resistance between the different lines on the input side.  Try
to find the highest resistance pair and hook that to 220v with the pcb end
of the transformer unplugged.

If nothing starts to smoke or hum loud, you're one step closer ;)  Measure
the blue and red pairs (I think those are theoclors, orange maybe?) for AC
voltages less than 20v on one pair (12v) and 15v on the other (5v).  I'm not
sure what the transformer puts out, but those re close to hte limits of the
caps on the 1541 board.


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