> Reply-to: <[EMAIL PROTECTED]> (Vintage Macs) > To: <[EMAIL PROTECTED]> (Vintage Macs) > From: [EMAIL PROTECTED] > Date: Mon, 18 Mar 2002 22:13:03 EST > Subject: Re: Apple 15" Multiscan Repair
> My Reply follows quote. On 18/03/2002 18:31 > [EMAIL PROTECTED] said: > > >Hardest part is getting tin pan off the CRT board if top isn't > >snappable off. Go slow, suck out excess solder that holds down tin snip! > ---------- > That is the part that has had me "put off" from tackling this project. I > guess it is "nothing ventured, nothing gained." Exactly!! Just go for it and go slow, use small flat screwdriver to flex apart both parts while melting one tab at a time and suck solder off at a time the edges till you can get them freed. Suck the excess solder off with solder puller or solder vacuum tool, whatever it is called. For that centre part that's last job to do, if has to, add more solder and keep it melted, then you will able to get pan off, not required to vacuum that solder. That centre part has heat interia, be patient while solder slowly turns from soild, sticky then finally melts, sproing! if you get it pried apart while doing it. Reinstalling pan, that centre is first thing to get resoldered. Important thing get all edges freed first, both parts pan and circuit board has enough flex to let you get enough gap to get solder out between them. When you get one tab seperated, wait a moment for solder to solidify before moving on to next tab. Don't worry about screwdriver touching other parts inside, just go gentle. If you have to bend the tin a bit, no problem, keep going and when done resoldering that crt board, straighten the tin pan and solder it securce. Remember to look at tabs if they goes though circuit board or at edges are straight, if not, straighten them! If it's bent or twisted and covered in solder (horrors!) drastic action is required, draw off excess solder, take a dull old stainless steel knife you don't care about and while keeping solder melted jam knife between that tab and circuit board and pry up, get remaining solder off, then finish straightening tabs to get pan off. Some damage will happen if solder isn't hot enough while prying up those tabs. Don't worry about that, parts of solder pads for tabs still remains on that circuit for decent connection with that tin pan. When reinstalling that pan, don't bother cliching tabs down, solder is plenty enough to keep it secure, all ones that were repaired do fine this way. At production process workers twisted or bent those tabs over to make their job easier and faster (more production for less expense) during soldering job that we curse at theirs idea while untwisting them. :-) Does not make sense to leave pan off, that "useless" bit of tin does helps image quality, better grounding and cuts down on RF emissions that may affect your other radio, tv etc reception. > > Ken > > Use it up, wear it out, make it do or do without. That battered solder trigger gun w/ charred tip that your grandfather stashed in old dusty box somewhere, that thing is too HOT it will fry the traces off the circuit board and heavy, but could be great for that massive thermal sink like the centre part of tin if you wish to. Get pencil type solder around 35W to 40W. Weller is decent brand and radio shack should have it and supplies you need is usually there also. Not expensive to buy these items either. When tips get eroded and becomes diffcult to melt solder despite the swiping on that damp paper towel, file just the tip itself to a medium fine point or chisel shape w/ fine toothed metal file hot or cold, sandpaper okay only when iron is cooled. Tin filed tip with solder when iron is hot once again. Damp folded paper towel to wipe your "dirty" iron tip from time to time. Flux chars and solder on it go grungy too, wiping with that will clean that tip up and keep your soldering job looking nice and much easier job going. Where I work, I don't like what techs are flicking sharply their iron tips toward hard floor that solder crap get splattered on the floor. >:-( Through, those solder splatters looks exactly like shiny metallic kind of splattered smooth tomato thick sauce. Cooled and stuck on metallic splats pops off easily like sheets of alumium foil and no damage to the floor except for bit of flux, that cleans up no problem. Except for that splattered carpet, removing them is hard part, with care, pull those blobs off much as you can and cut strands stuck to blobs right at the solder blobs w/ smallest scissor or fingernail scissor. ;-P Cheers, Wizard -- Vintage Macs is sponsored by <http://lowendmac.com/> and... 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