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From: SEWALL@UCONNVM.BITNET
Newsgroups: comp.sys.apple
Subject: Power supplies
Message-ID: <8707051015.aa23068@SMOKE.BRL.ARPA>
Date: Sat, 4-Jul-87 16:57:00 EDT
Article-I.D.: SMOKE.8707051015.aa23068
Posted: Sat Jul  4 16:57:00 1987
Date-Received: Tue, 7-Jul-87 06:41:34 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
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Before getting to the main topic: I tried to answer Steve Sloan
and got the mail back from the "Deamon."  What it said was that
sloan@cadovax.uucp is an "unknown user."  Did I spell something
wrong (unfortunately, I discarded the original request).  The
messages will hang around in my in basket for a few days; I'll
resend if I get a correct address from bitnet.

     POWER SUPPLIES

Funny you should mention that.  Tom Weishaar has a LONG answer
to a letter on that very subject in the July Open-Apple (p. 3.45).
The gist of it:

Symptoms: stange characters on the screen at, evidently, random
intervals.  Unexplained trashing of track zero.  CPU hangs that
won't replicate.  Often "fixed" by removing a card or two.  The
TransWarp accellerator and Central Point's 3.5 disk controller
are 2 power hungry cards that often are blamed.

Replacement power supplies (bad news generally)

Although they have higher ratings than the original Apple units,
experience indicates that have significantly shorter life spans
than Apple's.  All of the sources (listed below) actually are
selling Taiwanese units that vary in quality from shipment to
shipment.  That is, you may get a very good one and be extremely
happy.  I expect some of the messages posted here have already
puzzled a few readers as being quite different from their own
experience (both better and worse).

Apple's power supplies have two ground wires running to the
motherboard.  Some (not all) of the Taiwanese clones only have
one (beware those especially as the single ground wire models
have some other problems that may lead to failure to properly
ground the motherboard).

Suppliers (prices as of June 12)
                                          "Heavy"
                                           duty
Applied Engineering         (214) 241-6060  $69
P.O. Box 798
Carrollton, TX 75006

BTE Computers               (602) 867-8962  $59 (regular for $44)
14644 N. Cave Creek #6
Phoenix, AZ 85022

Jameco Electronics          (415) 592-8097   ?? (regular for $35)
1355 Shoreway Rd.
Belmont, CA 94002

JDR Microdevices            (408) 866-6200  $50
110 Knowles Drive
Los Gatos, CA 95030