Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!amdahl!greg From: greg@amdahl.uts.amdahl.com (Greg Bullough) Newsgroups: comp.sys.ibm.pc Subject: Re: Exploding clock cards Message-ID:Date: 7 Dec 88 16:43:22 GMT References: <16800395@clio> Reply-To: greg@amdahl.uts.amdahl.com (Greg Bullough) Organization: Amdahl Corporation, Sunnyvale CA Lines: 16 In article <16800395@clio> berger@clio.las.uiuc.edu writes: > >There should have been a diode preventing the voltage from being >applied to the battery. Was the diode shorted, or missing alto- >gether? > Well, there's more to the story, now. The card was replaced by a very concerned dealer. I plugged in the new card, pulled the battery, put a VOM across the clip, and turned on the computer. VOILA! +5 VOLTS! Great design, huh? I cannot find a blocking diode, so I assume it was left out of the design. Can anybody correct me if I'm wrong. It IS a no-no to put a positive over-voltage across a lithium battery, isn't it?? Greg