11 Dec
2015
11 Dec
'15
9:06 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Richard
Loken
Sent: 11 December 2015 16:45
To: General Discussion: On-Topic and Off-Topic Posts
Cc: General at classiccmp.org
Subject: Re: VAX 4000-500 PSU Overload?
...
My doctor once said to me that all problems in the head involve teeth and
I
can safely make a similar exageration:
All electronic failures involve capacitors
And this becomes (most repulsively) even more true when switch mode
power supplies are involved. Keeping that in mind will usually help with
diagnosis.
Well, I have the exception that proves the rule. My H7864 PSU (from an rtVAX
1000, same PSU as MicroVAX II) had a switching transistor and resistor fail,
no cap failures....
:-)
Regards
Rob