> -----Original Message-----
> From: PCI PowerMacs
> [mailto:[EMAIL PROTECTED]]On Behalf
> Of Mark Benson
> Sent: Thursday, April 25, 2002 2:42 PM
> To: PCI PowerMacs
> Subject: 7300 is go... :)
>
>
> Well I have a 7300/200 with 64MB RAM (I know, I know, but I
> can't afford
> anymore at the moment). What you may find even more
> miraculous is that
> the guy I got it from had a complete PC Compatibility card
> with all the
> necessary hardware but missing the Mac software. I soon
> fixed that by
> gettin PC Setup 1.6.4 and upgrading it to 2.1.7 and now it
> runs fine.
> I'm running OS 9.1 and although it isn't exactly up to G3
> speed it is
> certainly good enough to work in.
>
> The only problem I have sometimes is the machine seems to emit high
> pitched noise. It mostly went away after I put the PC card
> in (strange
> but true!) but is sometimes there. It seems to be the PSU,
> is it dying?
>
> --
>
> Mark Benson
>
> Vintage Macs List Nanny
> aka
> silicon_valley_pirate_uk (Yahoo! Messenger)
> SilValleyPirate (AOL Instant Messenger)
>
> Visit Flat Pack Macs Online at:
> <http://fpm.gotdns.com>
> Macintosh LC central
>
> Supporting England for the the 2002 World Cup - Come on lads! :).
>
Could be one or more of the capacitors in the PSU drying out, if you
can it may be worthwhile replacing them before the PSU fails as they
can kill other components in the PSU when they fail.
Start with the big one in the primary circuit (near the mains
connector) it will probably be about 200uf @ 300-400V or possibly 2
rated at 200v each.
the others that go are the DC smoothing caps at the other end of the
board, they will be 400-2000uf at 6-25V, when these fail the symptom
is a high pitch squeal at switch-on for a second or so before the PSU
shuts down.
This basic guide is for any switchmode PSU, not specifically the 7300.
Ben.
--
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