all of you three a happy new year and your Lisa's, too. They 've been
altered one more year in 2002, some of them will soon become adult!
Thanks for Jim's hint to look at applefritter. I tried the link, which was
suggested, but the server of applefritter was broken down, I'll try later
again. Hope this schematic is the one of the 1,8 A power supply; seems to me
that there are schematics which are really different from the real
power-supply all over the web, and nobody cares; or nobody seems to repair
the 1,8 A supply!
James: In far away future, a few years, when I'm out of work, I will draw a
schematic of my three identical 1,8 A supplies. Then it will be more
neccessary as today, cause you will get supplies very hardly than today. And
we here in europe use only the 1,8 A supplies, cause of our 230 V powerline.
Alex has the right idea, perhaps is it the total disjusted pot, have to try
several adjustments, not very happy to do that on a opened, flying board
with high voltage in it!
James' idea with the switch on the back panel isn't the way to do, cause the
problems starts later in the heart of the supply long after the switch's
point to interfere, but the suggestion with the perhaps corrupted
overvoltage protection is really good. I'll try and keep you on track with
any news - and of course my pidgin english-slang!
Thomas
> Hi Tom,
>
>>unfortunately I have to notice, that the pot R11 2k Ohm is not the cause for
>>that little problem I got with the power supply. As I described, I changed
>>the whole part platine 99P0108-000 (where this pot is mounted on) and I'm
>>still not able to start the unit.
>
> I think Alex was suggesting that the pot be adjusted. Some Lisas won't
> start up because the power supply has drifted over 5.1 volts, so the
> crow-bar (over-voltage protection) engages, and the Lisa won't start up. In
> that case, you hear the tell-tale "click, click, click" but I guess you
> don't hear that. Alex had this problem with his Lisa and the 1.2 Amp power
> supply, which is a bit different as you found.
>
>>I have the 150 V at the two 470 microfarad after the rectifier, so the unit
>>could work if it wouldn't be permanently inhibited.
>
> Perhaps you should check the safety interlock switch on the back panel?
>
> We have needed a schematic for this (1.8 Amp) power supply for a long
> time... perhaps you would be willing to draw it?
>
> Happy New Year!
>
> James
-- LisaList is sponsored by <http://lowendmac.com/> and... Shop buy.com and save. <http://lowendmac.com/ad/buy.com.html> Support Low End Mac <http://lowendmac.com/lists/support.html> LisaList info: <http://lowendmac.com/lists/lisa.html> Send list messages to: <mailto:lisalist_at_email.domain.hidden> To unsubscribe, email: <mailto:lisalist-off_at_email.domain.hidden> For digest mode, email: <mailto:lisalist-digest_at_email.domain.hidden> Subscription questions: <mailto:listmom_at_email.domain.hidden> Archive: <http://www.mail-archive.com/lisalist%40mail.maclaunch.com/> Using a Macintosh? Get free email and more at Applelinks! <http://www.applelinks.com>Received on 2001-12-28 08:05:48
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