3 Jun
2008
3 Jun
'08
9:25 p.m.
To: cctalk at classiccmp.org
From: legalize at xmission.com
Date: Tue, 3 Jun 2008 14:42:05 -0600
Subject: Re: powering up older machines - is it safe?
In article ,
ard at p850ug1.demon.co.uk (Tony Duell) writes:
Hi
I'd admit it is rare but it does happen. The only case I've seen
was on a pin ball machine. The way the case of the 5V regulator
had a bad connection through the mounting. This caused the output
voltage to go to the full 12V of the input. It wiped out a rare sound
chip and a couple TTLs. Not a good thing.
This can surely happen to most any regulation circuit. Some shorts
and some opens can cause the regulation feedback path to go open.
Dwight
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The main worry is not a capacitor Failing. The
main worry IMHO is that if
there's a fault in the power supply regulation circuitry then that could
make the +5V line jump to a high enough voltage to wipe out just about
every chip in the machine. Expansive and difficult to put right.
I don't disagree with the concern, but I'd be interested in hearing
estimates on the probability of this taking place. Has anyone had it
happen to them?