>From: "Mike Kauspedas" <[EMAIL PROTECTED]> >Date: Sun, 06 Oct 2002 23:34:10 -0600
>>Well, if you had god-like soldering abilities, you could desolder the >>PPC601 chip from the PM7500/100 card and put it on the 7100 board. >>You'd also need to replace one of the resistors on the adjustable >>voltage regulator and maybe add level-converting buffers to some of >>the IOs as the PPC601/100 uses some different voltage levels from the >>PPC601/66 or 80. >> >>One thing that makes this more difficult is that Apple hot-glued the >>CPU down. If you look on the back of the PM7500/100 card you'll see >>a hole behind the PPC601. Apparently, they squirted hot glue in >>through this hole or let it escape through that hole as they set the >>CPU down in the glue. >So is there is a manula on how to fly this thing? Do you know where I can >find a guide on suadering this thing. At this point, if I accomplished a >feat such as that, I might be Godlike. Its worth a shot, I only paid $5 for >the Mac. I posted that as mostly a joke. It really would take amazing soldering abilities and it's not clear you could get the voltage levels to match up on the IO lines. There are 304 closely spaced (.02" pitch?) pins on the PPC processor and they are delicate and easily bent. Though I did see someone selling a PPC601 CPU on Ebay as a "Pull". I.e. just the CPU. They were reselling a desoldered CPU. Oy. Anyway, there's no guide. You could download the data sheets on the PPC601 versions to see how the voltage levels vary with CPU version, and the LT1085 voltage regulator to see how changing two resistors affects the voltage level output and work from there. You might also visit Chip Quik's web site for advice on desoldering surface mount devices. But as far as I know, no-one has actually done what I suggest. I believe that MacResQ or one of the other repair houses has replaced the PPC601 CPU on a PM9150/120 board, but I don't know from where they got the replacement CPU and they probably have a nice hot air station. Jeff Walther -- 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:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
