> -----Original Message----- > From: 1st PowerMacs [mailto:[EMAIL PROTECTED] Behalf > Of Greg Shafritz > Sent: Wednesday, October 15, 2003 10:55 AM > To: 1st PowerMacs > Subject: Dead NuBus Cards - how to revive??? > > > Hi All! > > Here's a good one for those of you with a DIY technical background: > > What are the most common issues that could make a NuBus card "DOA"? I > recently received an FWB SCSI Jackhammer that does not show up in Apple > System Profiler, and Tattle Tech also cannot detect the presence > of the card > when installed. > Essentialy, this therefore is a "dead" card. > > What are the first things I should look for in trying to repair this card? > I assume that I should first check to be sure that it is receiving power > from the motherboard - true? > Do these cards sometimes have onboard power supplies that fail? > What about blown microfuses (what would a fuse look like that wasn't a > conventional fuse) - is there such a thing as an SMD fuse? > > I'm ready to dive in really deep, and I've got all my test > equipment out... > who's able to help point me in the right direction as to how to proceed? > Yes there are SMD fuses, also SMD inductors, if the components are labelled then the fuses are usually marked F1, F2 etc and the inductors L1, L2 etc, the inductors are usually black and have no markings on them, the fuses vary, some are the size of SMD resistors, while others are large white rectangles (about 3mm square by 8mm long) the larger ones have their value on them, the small ones often don't. both fuses and inductors can fail (they should both read 0 ohms). the other thing to look out for is an on-board voltage regulator, if these fail it is usually through overheating, this normally discolours the pcb. if this card has a 25-pin external connector then the 5V fuse is probably blown when someone has tried to connect a PC printer to it !!. Good luck Ben.
-- 1st-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> 1st PowerMacs list info: <http://lowendmac.com/lists/1st-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]> List archive: <http://mail.maclaunch.com/lists/1st-powermacs/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
