> Plugging it in and switching on power, I get a Sad Mac and code 040010 > with some "morse code" cycling underneath. > > My limited research says RAM check failure, G7, location 0400. One of the > soldered, Apple Logoed chips?
Actually, the error code says that you have a bad ram chip at location F9, not G7. If it's to be believed (it can get fooled by some other problem from time to time, so it's not 100% certain), then you will need to replace the 64kbit DRAM chip at that location. There are letters and numbers silkscreened along the edges of the motherboard to identify the position. The chip you need is a 4164 (or equivalent), with a speed of 150ns or thereabouts (it's best to match the speed of the other chips, so go with whatever they are; I forget at the moment, but it's certain to be no greater than 200ns). To replace, use sharp diagonal cutters to snip off all the leads on the old chip, as close to the body as possible. Then use a soldering iron on the foil side of the board, and remove one pin at a time. Do not pull too hard, or you run the risk of lifting a trace. And don't apply heat longer than absolutely necessary. After removing all the pins, make sure all of the holes are clear (use solder wick or a solder sucker to suck up the solder, and/or a thin-gauge wire shoved through the hole quickly). Then insert the replacement chip and resolder. Carefully inspect your work to make sure that you haven't bridged adjacent traces with solder blobs, and that you've truly soldered each pin securely. Good luck! -- Prof. Thomas H. Lee Center for Integrated Systems, CIS-205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu 650-725-3709 ph, -3383 fax -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.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/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
