Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!mcnc!gatech!bloom-beacon!mit-eddie!ll-xn!ames!ucbcad!ucbvax!UCONNVM.BITNET!SEWALL 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 Distribution: world Organization: The ARPA Internet Lines: 54 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