From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-06-13 07:07:18
On Wed, 12 Jun 2002, Daniele Gratteri wrote:
> Hello, a friend of mine found what probably is an US 1541 drive since it is
> powered by a 117V 0.5A power supply. Its board P/N is 1540050 and there are
> many "patches" (I think these are official upgrades).
> But the problem is that, here in Italy (and in Europe) the power is 220V. So
> I have compared the 117V power supply and the 220V one from another drive
> 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? ;-)
>
> P.S. the PSU P/N is the same but the 117V one ends with "-02C" and the 220V
> with "-03C".
The -01 and -06 versions are the North American versions. The power
supply layout page in the service manual indicates that the red and black
wires can be switched. The black wire is attached to the fuse for -01,
-02, -05, -06, -07, and -10 versions. The red wire is attached to the
fuse for the -03, -04, -08, and -09 versions.
The power supply is connected to the circuit board by a 4 position
connector. You can make your change and check the voltages at the
connector (with the connector disconnected) without risking any sensitive
circuits. The outer 2 pins are one circuit and the inner 2 are another
circuit. The information I have does not agree as to which is for the 5
volt supply and which is for the 12 volt supply. At any rate, you should
have 9.7 V AV and 15.5 V AC on the 2 circuits.
My information is that a 1541 should have a 1 A fuse. I would use 1/2 A
at 220V. If that's wrong, you only risk the fuse.
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