Using a US Lisa in the UK -- redux! from Tom Stepleton on 2015-12-10 (lisalist1)

From: Tom Stepleton <stepleton_at_email.domain.hidden>
Date: Fri, 11 Dec 2015 00:25:45 +0000

After a long recess I'm looking forward to getting my US Lisas working here in London. (I'll spare you the story of getting them here---what a hassle!)

This isn't the first time someone's had to deal with this---here's an older conversation:

https://groups.google.com/d/msg/lisalist/QgkPHNrYCdA/zJzq2xFKmcEJ

The main thing is to change some jumper wires in the Lisa PSU (and since the ProFile service manual on Bitsavers calls the ProFile PSU 120/240v switchable, probably the same in the ProFile).

However, the posts on that thread talk about changing the decoupling capacitors as well. I am guessing that the reason for the warnings might be that the higher mains voltage in Europe are harder on old capacitors than the 120v supplied in the States. Is this correct?

Replacing old caps is probably something that would be to do anyway---indeed, I've posted about it several times but never worked up the gumption to get it done. Can anyone identify which capacitors are the decoupling caps that are most important to replace? I'll need to know for both the 1.2A and 1.8A PSUs, as well as the ProFile PSU.

So, if anyone's done this recently and has a BOM, that would be fantastic!

With that done, once I find the UK equivalent of digi-key I'll be all set. I guess it might be digi-key <http://www.digikey.co.uk/>...

Thanks all,
--Tom

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Received on 2015-12-11 06:27:39