Re: Apple Lisa UK power supply

From: stevejenner100 <stevejenner100_at_email.domain.hidden>
Date: Thu, 11 Oct 2007 07:08:38 -0700

Hey James

Thanks for getting back to me so quickly and thanks for the really useful info. I have noticed that there are some refurbished power supplies 1.2 and 1.8 versions for sale on ebay at $189.99 and $249.99 respectively. Item no. 140065350670. Once shipping is added to the Uk it seems quite a lot to me, so will take your advice and find someone local to do the repair. I am ok ish with a soldering iron but with something like a psu I will leave that to someone better qualified than me to do it. The rest of the power supply looks ok to me, so is probably worth getting it repaired instead.

You mention a Datapower replacement. I have looked on the internet for one of these but had no luck. Are they still available?

I have taken a few pictures of the power supply for all to see. The power supply part number is 620 (you can see this in the pictures) but there are no other numbers after it?!?

Whilst taking the machine apart to take these pictures I decided to strip out and clean the machine and to my horror, my Lisa has been subject to the dreaded leaking NiCad batteries on the I/O board. I have removed the batteries and have cleaned up the corrosion as best as possible. The leakage was not as bad as it could be, but the corrosion around where the batteries sat is quite bad. Obviously this would need to be addressed before getting power through the Lisa and causing more problems else where. Is it possible to re-solder the channels where it is damaged or would it be best to run small wires directly to the points on the board to and from the affected circuits? Do not want to mess this up as I should think replacement I/O boards for these are as rare as hens teeth. Any advice would be very grateful.
I have included pictures of the corrosion for all to look at.

Also excuse my ignorance, but what does the on off switch on the I/O board do that is situated underneath where the batteries once were.

Many thanks

On Oct 10, 10:03 pm, James MacPhail <g..._at_email.domain.hidden> wrote:
> >burst capacitor on the power supply but as this is a UK version is rated
> >at 220v and 0.7 amps.
> >Does anyone here know where I can get a replacement unit or how I go
> >about getting it repaired in the UK.
> Someone familiar with repairing switching power supplies should be able to
> fix it. For example, a local TV repair shop.
> If you are handy with a soldering iron, you may be able to repair it
> yourself, especially if replacing capacitors is all that is required. There
> are lethal voltages involved, so care and caution are required.
> Note there are two designs of the Lisa PSU, the earlier Apple design and
> the later DataPower design. When looking for a replacement, the latter is
> considered more rugged and is very easy to switch to 220V.
> Your PSU, rated at 220v and 0.7Amps, is the Apple design (often referred to
> as the 1.2A PSU, because of its rating at 120V).
> The 220 and 120 volt variants of the PSUs are only slightly different, the
> schematics on the internet apply to both. (Which may be useful for repair,
> or altering a replacement, eg. from eBay.)
> There is further information in the LisaFAQ:
> <>
> I see the LisaFAQ is missing the Apple part number for your variant of the
> PSU, can you see it on a label on the PSU enclosure somewhere? (Probably
> 620-xxxx)
> HTH,
> James

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