Catastrophic PSU failure (was Re: Apple IIGS for parts) - test-drb@ccmp.vtda.org

28 Jul 2000

--- John Honniball &lt;John.Honniball(a)uwe.ac.uk&gt; wrote:
...
  I think the easiest-to-find fault I've ever seen
was in an 
 ICL One-Per-Desk, where a transistor in the driver circuit 
 blew up.  It made a loud bang, leaving the plastic body of 
 the transistor in two pieces, one having two legs, and the 
 other having just one. 
I fixed a keyboard/monitor switch at work that a cow-orker had
damaged by plugging in the wrong wall wart into - 48VDC (phone)
instead of 9VDC.  I opened the lid and saw the gaping hole in 
the 7805 and the mess made when the filter cap ruptured and
vented its electrolyte.  <$4 at Rat-Shack prices and it was back
in business.  The best part was the look on my boss' face when
I told him we didn't need to buy a new one.  He couldn't fathom
how I could open up the box, look inside and figure out what
was wrong without the aid of mechanical assistance.  It seemed
obvious to _me_ what was wrong.

-ethan

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