Re: Using a US Lisa in the UK

From: Ian Law <ilaw76_at_email.domain.hidden>
Date: Sat, 14 Nov 2009 09:16:38 +0000

Thanks very much indeed for this Helmut. It doesn't sound nearly as complicated as I was expecting.

Tom, you're indeed correct - it's been a while since I took on an electronics project. I think I'll take a look when the Lisa arrives and if I'm not confident I'll take the PSU to a TV repair shop. Luckily there is one near where I live.

Many thanks all for the fantastic advice!

Best wishes,

2009/11/13 Diogenes45 <helmut_post_at_email.domain.hidden>

> Hi Ian,
> it's not tricky to convert the Lisa PSU's from 110/120 Volts 60 Hertz
> to 220/230Volts/50 Hertz or vice versa.
> The only thing you have to do first b e f o r e you plug in your Lisa
> into any european Live voltage connector is to change your (wire)
> jumper configuration inside the PSU. You can easily find those 2 wires
> and the 110Volts and 220 Volts connectors respectively.
> Simply remove the wires by unplugging them from their 110/120 Volts
> configuration and reinsert them into the 220/230 Volts configuration-
> you can easily find the correct configuration on the PCB.
> The most important thing is to exchange the power surge (decoupling)
> caps first- the transparent caps with the fine crackles... they tend
> to explode. I had 2 explosions in my Profile PSU and 1 in my Lisa- but
> this didn't do any harm to the other parts in my profile and Lisa.
> Perhaps I was lucky....
> BTW: I used WIMA caps- most of them are no longer transparent- they
> changed the plastic material.
> Best regards,
> Helmut Post
> On Nov 12, 7:44 pm, thelawman <ila..._at_email.domain.hidden> wrote:
> > Hi all,
> >
> > I've been lurking here for a few weeks, but this is my first post.
> >
> > I've just got my hands on a Lisa 2/5 which is being shipped from the
> > US to me in London. I'm assuming that it's got the 1.2A 110v/60Hz
> > Apple power supply and that the Profile drive is also US power spec.
> >
> > As I understand that the 1.2A PSU is tricky to convert to 220v/50Hz
> > and I'm guessing that converting the Profile drive isn't easy either,
> > I was wondering if I could get away with using a US-UK step-down
> > transformer? Although a transformer will convert the voltage to 110v,
> > the frequency will remain at 50Hz - will the Lisa and Profile PSUs be
> > able to tolerate the lower frequency? If not, do I have any other
> > options?
> >
> > Many thanks in advance for your help,
> > Ian
> >


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