In a message dated 11/6/02 2:53:57 PM, [EMAIL PROTECTED] writes: << >Some 8600/9600s have power supply problems which can result in processor >overheating.
I'm curious to know how that can happen ... >> I am, too ... but I have no time to troubleshoot this particular power supply ... I just replaced it with one of my spares. >> ... unless the power to a fan is inadequate ... >> The fan in the side cover and the fan in this particular power supply were both operating properly, meaning that the 12 volts was regulating properly. I believe the 5 volts is interdependent with the 12 volts, and sure enough the drives were working properly. The "word of art" for this regulation scheme is "semiregulated". However, I believe the 3.3 volts is independent of both the 5 and 12 volts. If so, then the 3.3 volt regulator in this particular 9600's power supply may have been faulty. I only checked the 5 volts (I found it to be about 5.05 volts, which is within 1 percent of specification) and the 12 volts (I found it to be slightly lower than 12 volts, but still within the +/- 5 percent specification). I did not check the 3.3 volts, which is what the "processor core" runs on, and which I believe is faulty in this particular power supply. This flaw will only affect components which are operated directly from the 3.3 volt power supply, which on the 9600 may be only the processor card. For sure, the DIMMs are operated from the 5 volt supply, even if the chips on specific DIMMs are actually 3.3 volt parts. -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:pci-powermacs@;mail.maclaunch.com> To unsubscribe, email: <mailto:pci-powermacs-off@;mail.maclaunch.com> For digest mode, email: <mailto:pci-powermacs-digest@;mail.maclaunch.com> Subscription questions: <mailto:listmom@;lowendmac.com> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
