On 20/10/03 9:31 pm, "PCI PowerMacs" <[EMAIL PROTECTED]> wrote:
> Message-Id: <[EMAIL PROTECTED]> > In-Reply-To: <[EMAIL PROTECTED]> > Date: Mon, 20 Oct 2003 17:33:54 -0400 > From: Fluxstringer <[EMAIL PROTECTED]> > Subject: Testing Power Supplies.. > > Hi Listers, > i have power supplies from a 7100 and an 8500 that I want to > test. My question is can I plug them into the AC and turn them on > without also being plugged into the motherboard. Or will this kill > the unit ? > > TIA You may find 'and turn them on' the difficult bit. You'll note there is no power switch. Powering on is usually undertaken by circuitry on the logic board. After applying mains check you have +5V TRKL present, you'll have no other outputs. Then short +5V TRKL to the POK line and the PSU will start and fan spin. This is the most basic test. A simple piece of wire to bridge +5V TRKL to POK will weed out the obvious failures. To be thorough you need to load each of the PSU outputs. When I used to repair lots of the older PSU's I made up custom leads that connected to an active load. I could then vary the loading on each output. Although less versatile, you could use aluminium clad resistors screwed to a large heatsink. Steve Bell -- 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
