On Monday, Oct 14, 2002, at 18:28 Europe/London, Spiritus ex Machina wrote:
> Folks, > > I'm doing some volunteer work at my son's school, trying to keep some > venerable hardware in use. Good man - this week's notional Mars bar to you - and it's only Monday! :). > I've got an LC that I'm trying to set up > for the kindergarden class to use for practicing keyboarding and > mouse manipulation. Awwwww. That's too cute - it makes me fell all fuzzy inside. My niece is at 'playschool' which is essentially the same thing as KG. We have made a point of getting stuff for her to play with on my dad's machine. It's good practice in a modern world where everyone is expected to be able to use a computer. > It starts up with a satisfactory 'Bong!' and seems to be running > System 7.5.5 with no problem. Ee gods. Put 7.1 on it. I know they aren't likely to know the difference but the mouse might actually keep up with the hand movements if you do ;) > However, it starts screaming and > squealing like an AM radio in a really bad reception area. The > problem is definitely in the sound generation, not the hard drive > bearings. (I swapped hard drives to no effect; removed sound/fan > module and problem went away). > Can anyone suggest a way to fix this? Certainly I can clip the > speaker leads, but then the soothing 'Bong!' goes away. :-( Try this for size. the wires are in pairs coming off the logic board. Try sticking a folded bit of paper under one pair (one pair is blue+red the other is black+red) and seeing which pair makes the noise go away. If it's the black+red pari it's the sound system/speaker, if it's the blue+red pair it's the fan. If it's the fan rob another module and try it. The fan can be swapped by removing the fan itself from the frame and then getting a small screwdriver and pushing in on the two clips at the inside of the contact housing on the two metal tabs that correspond to the fan wires. The wires just unclip from there and the fan is free. Do the same with a good fan and replace it. It's a lot of fiddle so it's probably just best to designate another machine for spares and swap em out. If it's the speaker then you can again swap the whole module or the speaker comes out in a similar way (you have to unclip the fan to get to the metal tabs). Also if the sound IS on the fritz then it might be an idea to clean the contacts on the board and the module with an electrical cleaner. DON'T use abrasive on the pads on the logic bard as you will bring it off, it's only solder IIRC. If all that fails check the logic board for dry joints. > Is this > an indication that bit-rot is setting in and that I should just part > out the box to salvage other boxes? I have absolutely no money for > 'upgrades'. Repairs will have to be made out of salvage or my own > resources. Nahh. Just needs a little TLC and transplant work. -- Mark Benson AIM - SilValleyPirate Visit FlatPackMacs online: <http://fpm.gotdns.com> Mac LC Central My homepage: <http://homepage.mac.com/markbenson/> -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> 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/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
