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Article #1407

11/750 power supply help

#1407
From: Dan Lanciani
Date: Fri, 21 Aug 1992 05:17
16 lines
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	I have an 11/750 power supply problem.  Within minutes of
power-on, the "reg fail" light comes on.  The "+5 fail" and "+2.5 fail"
lights are off, and, indeed, those voltages are present and correct.
In fact, the only voltage that looks odd is the -15 feed.  It starts
out around -15.1 and drifts to -14.5 at which point the "reg fail"
appears.  Thereafter it continues to about -14.2 and stays there.
Removing the +-15 load does not change the voltage, so the problem probably
really is the regulator.  Does anyone have a spare +-15 regulator module
they'd like to part with?  (I'm hoping the +-15 plug-in board is at fault,
but maybe the whole +5/+-15 unit would be easier, if heavier.) Alternately,
print sets could be useful...

				Thanks,
				Dan Lanciani
				ddl@harvard.*
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From: ddl@burrhus.harvard.edu (Dan Lanciani)
Newsgroups: comp.sys.dec
Subject: 11/750 power supply help
Message-ID: <1992Aug21.051718.20788@burrhus.harvard.edu>
Date: 21 Aug 92 05:17:18 GMT
Article-I.D.: burrhus.1992Aug21.051718.20788
Organization: Harvard University, Cambridge, MA
Lines: 16