-----Original Message-----
From: Rob Jarratt [mailto:robert.jarratt at
ntlworld.com]
Sent: 25 March 2011 23:22
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: MicroVAX 3100 Model 95 Damaging SIMMs?
-----Original Message-----
From: cctalk-bounces at
classiccmp.org [mailto:cctalk-
bounces at
classiccmp.org] On Behalf Of Richard
Sent: 18 March 2011 02:56
To: cctalk
Subject: Re: MicroVAX 3100 Model 95 Damaging SIMMs?
In article <008301cbe4f8$36678f50$a336adf0$(a)ntlworld.com>om>,
"Rob Jarratt" <robert.jarratt at ntlworld.com> writes:
No I have not, sounds like that is my next step,
although I don't
think I have the equipment to check if the PSU is operating to spec,
I can visually check components.
Supply voltages can be checked with a simple voltmeter. With dummy
resistor loads on the PSU you can check current supplied by measuring
the voltage across the resistor load.
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I have just been checking the outputs from the PSU and was wondering how
"good" they are. Here is what I measured:
On the standard Molex connector the 5V output is around 5.3V, the 12V
output is pretty much dead on. On the CPU power connector I measured
these voltages:
5.0V
5.3V
5.3V
-12.46V
-5.98V
5.31V
12.04V
5.31V
I am not sure what the nominal voltages are supposed to be on this
connector (the -5.98 looks a bit suspicious) and how much out of tolerance
they are. How do these voltages look?
Regards
Rob
Actually I just found some info on the PSU label, it says
V1 +5.1V
V2 +12.1V
V3 +3.3V
V4 -12 V
V5 -9V
Some of the voltages I measured are a long way from that. I certainly did
not measure 3.3V or anything close anywhere. Of course I am not sure which
of the pins I measured should be 3.3V and little clue which one it might be
except perhaps for the one that I measured at 5.0V which is only because it
is numerically closest. Should I be looking at replacing capacitors as
suggested, would that be the cause, or is it going to be something else
entirely? Having inspected the capacitors there is no *visual* sign of
anything wrong.
Thanks
Rob