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- Path: news.mountain.net!usenet
- From: gene_heskett@wvlink.mpl.com (Gene Heskett)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: PSU Woes
- Date: 23 Feb 96 22:38:39 +0500
- Organization: MountainNet, Inc. Morgantown WV 800.444.1458
- Message-ID: <2093.6627T1358T1992@wvlink.mpl.com>
- References: <DMEpE0.EMs@bton.ac.uk> <1013.6621T1063T2544@wvlink.mpl.com> <1488.6623T409T2094@fuchal.demon.co.uk>
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-
-
- CA> Hey, Gene Heskett, you mumbled somthing about Re: PSU Woes on
- CA> 17-Feb-96
- CA> 17:43:50?
-
- GH>> No, no laughter from here, just a fervent wish that the re-fused
- GH>> supply has
- GH>> *never* had its output plug anywhere near your 1200, else it
- GH>> also is probably very well done if not toasted/burnt. However,
- GH>> just to make sure the supply isn't doing all sorts of oddball
- GH>> things because it needs a load, stick something like aa auto
- GH>> stoplight lamp between the 5 volts and ground. If thats the
- GH>> case, and it appears to work with that load, it might be safe to
- GH>> hook it back up to the 1200 for further tests. The bulb won't
- GH>> get very bright as most of them are for 12 volts...
-
- CA> Yes, the PSU *does* need a load on, I just built someone a 200
- CA> watt one and that would shoot up to 5v on the 5v line, then
- CA> reduce quickly to about 2v. Also the fan wouldn't turn without a
- CA> load, I suppose it was connected to the output directly.
-
- CA> Ami ones are the same I suppose. Find some low power components
- CA> and commect these to the relevant lines and gnd and retest.
-
- CA> My way of testing them is a) pray, b) check the wiring, c)cross
- CA> your fingers, d) check the wiring once more and I'm sorry to say
- CA> e) plug it in the back of my A1200 (spare one). Not very
- CA> technical is it? :)
-
- CA> Chris
-
- Ah, umm, cough, umm, sigh, no.
-
- The required load could simulated with an old headlight. It should
- grab 2-4 amps and stabilize the supply if the supply can be
- stabilized at all. While doing that, check not only the dc voltage,
- but also check the ac voltage there with some meter that doesn't read
- any dc present at the same time. The reading then should be under 50
- millivolts, thats .050 volts ac. Anything more, as in 10x that, and
- the supply needs help badly.
-
- Cheers Chris, Gene
-
- /* Gene Heskett | These opinions are NOT to be */
- /* CE @ WDTV Weston/Clarksburg WV | confused with the official */
- /* <gene_heskett@wvlink.mpl.com> | WDTV managment views */
- #include <std.disclaimer>
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