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SE/30 re-cap and subsequent revival

Cloud

Member
The SE/30 which I acquired the other day had next-to-nonexistent volume.

I removed the logic board from the machine and took a closer look. There was liquid pooled in some of the vias near the "fuel tank" caps and a few chips near them had some slight corrosion on their legs.

Not good!

I swabbed off the accumulated liquid as well as the slightly corroded chip pins with q-tips soaked in IPA and tried the board again. It booted to SimasiMac and would only resume the boot sequence if left for around 10 minutes.

I had made it out of the frying pan, but into the freezer! OH NOES!!1one

I rummaged for the wire snippers and set about removing the old "ticking bomb" caps from my beloved machine's board.

I carefully gripped each cap with the jaws of the snipper and rocked it side to side till the cap's solder joints gave way and it broke free. I'm not those solder-pad ripping clowns who twist their old caps off the board!

Behold the horrors that lurk underneath!

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After recovering from the minor shock, I cleaned off the fetid rusty liquid with the IPA-soaked q-tips and re-tinned the solder pads till they were flat and shiny again; it took about an hour.

The next day, I secured the necessary capacitors to breathe new life into my ancient machine, and set to work. It only took about a minute to solder each replacement cap into its new home.

Notice the exposed copper on the bottom right of the board, next to the ROM SIMM slot; I was swabbing leaked electrolyte off from around the area when a chunk of varnish (but thankfully NOT the trace) crumbled. I went "FFFUUUU there goes my trace -- wait... ah THANK GOODNESS!" (and had a minor heart attack!) :p

Logic board, in its recapped glory!

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After the re-cap, I tested the machine and was greeted with the speaker issuing a triumphant dinggggg, followed by the mouse cursor and the flashing question mark immediately afterward. So long, SimasiMac!

Taking advantage of the machine in its disassembled state, the internal hard drive was swapped with a 540MB Conner CFA540S and the PRAM battery was replaced. I don't like my Macs thinking that it's either 1904 or 1956.

Following that, I re-assembled the machine, and cleared an area of my desk to house it. A burn-in test consisting of formatting the internal hard drive with a patched version of HDSC Setup followed by installing System 7.1 from floppies completed successfully.

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Memory was getting tight after System 7.1 had been enhanced with a few third-party control panels and utilities.

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4MB of memory was promptly "borrowed" from a pending-recap Mac II I had lying around.

Two popular productivity apps are now running concurrently with comfortable room to spare!

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Unlike "collectors" whose vintage macs end up either being displayed on fancy shelves and gathering dust, or as glorified desk clocks/fish tank simulators, those which I own are put to good productive use!

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This memory viewer gives a visual representation of the current state of system memory as well as a few related geek stats; fancy graphs to keep me amused as I launch apps and go about pounding my free memory into the dust! ;D

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And there you have it! One classic mac properly liberated and joining the ranks of useful productive machines once more!

 

Cloud

Member
Nope. It's DeskPicture.

Not versions 4.5 or 4.51 with the ugly marijuana icon and shareware nag screens though. It's an old version from 1992 that was a part of Now (yes, Now, not Norton!) Utilities 3.0. I'm sure you can find it somewhere if you're interested. :)

 

tt

Well-known member
This memory viewer gives a visual representation of the current state of system memory as well as a few related geek stats; fancy graphs to keep me amused as I launch apps and go about pounding my free memory into the dust!
I'm still curious about this application, does anyone know what it is?

 

uniserver

Well-known member
Very good job sir, nice job on those caps, could you make a HD image and circle the caps you changed and what the values of each cap was?

thanks and i also would like to know what the name of that nifty memory app you were using! thanks!

 

Cloud

Member
I'm sorry for my tardy reply tt and uniserver - the app in question is called MenuMaster. It adds a dropdown menu to your menubar (look for the down-facing triangle next to the application menu) which can be configured to show the apps you specify - along with launching them with a click - kind of like the Mac OS X Dock, but in dropdown menu form.

 
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Cloud

Member
Forgot to mention that the aforementioned MultiMaster is also a part of Now Utilities 3.0.

 

Mk.558

Well-known member
Nice.

Going full throttle with the 470µF and 220µF tantalums?

It is also considered a criminal offense in 3 countries to mess up a socketed SE/30 logic board.

 

Cloud

Member
Yep. And they cost a freaking bomb!!! I think the 220uF and 470uF caps cost as much as 5 of the 47uF ones... EACH!! 8-o

If you want to see messed up, here you go! (It's techknight on camera, talking about repairing re-cap disasters)

 

Bunsen

Admin-Witchfinder-General
One of your tinypics seems to have disappeared. I would strongly recommend uploading your images to 68kmla as inline attachments in the post. If you would like a mod to edit the original post to that effect, just let us know.

 

blatboy

Active member
Interesting. You removed your caps without an iron at all? Impressive... and ballsy. I'd be afraid of being one of those pad ripping types... I guess it's all in your technique?

I'm about to recap a Classic II...

 

Cloud

Member
I found that in all the cases of leaky caps, there was so much corrosion that the heat from the iron absolutely would not penetrate the oxidized solder which had turned almost as black as coal, no matter how long I tried (applied heat for close to 30 secs using a solder blob on the tip of a 35W iron touching the cap's exposed SMD legs, board was getting mighty warm but cap still wouldn't budge) and I knew the dangers of turning up the heat further.

I then set about carefully breaking the solder joint through wiggling it back and forth with gradually increasing amplitude - this induces something called metal fatigue in the solder holding the cap down, weakening it and allowing it to pop off by itself eventually with enough rocking.

The key here is never to apply any upward motion - just pure side-by-side rocking.

Granted, that's not foolproof and the pad might still rip due to extreme deterioration from capacitor juice. But with the rocking method, you'll feel the cap "catch" instead of snapping off completely. When that happens, cease all rocking immediately, bring the board to an area with good light (direct sunlight works the best), get a loupe, and delicately work the iron - rednecking a "turret" so the iron is free to rotate about its axis while kept steady - to free the cap from the partially ripped trace. If done correctly, the trace will be left "floating", clean it up like normal, and the leads from the new cap can (very carefully) be soldered back to it. Make a note of the locations of any partially ripped traces so future techs to work on the board will be exercising more care around it and not inadvertently rip it off!

Of course, the only truly "proper" way to carry out this operation would be to commandeer a professional wave soldering station complete with robotic pincers to lift the caps off the board, but meh, little proletariat me can't spare the expense :(

 

Mk.558

Well-known member
Apple could make us SE/30 socketed logic boards all over again.

With vastly improved ...everything. Onboard Ethernet, video out, the works. And IDE support for our CF cards.

Should be able to find a gold coin or something like that in a sea of $100 billion. Shouldn't cost that much, they already got the prints, we've got models if they need it.

 

Cloud

Member
Apple would love nothing better than to see stuff get recycled the moment they obsolete it.

Unless the US Army decides the SE/30 would be the best interface for some new-fangled weapons system and comes forward coddling Tim Cook with a generous helping of defense funds...

 
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