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| PowerBook Duo 280 | |
| Posted by: ururk on 2024-01-17 13:38:30 I have a PowerBook Duo 280 (greyscale) with a bunch of accessories... but I can only locate the PowerBook at the moment. The charger, floppy drive, ethernet adapter (memory might be mis-serving me here on this point) are somewhere in the house packed away. At the moment I just want to see if it still boots (last booted up... 2006?)... is there a modern power brick I can buy that is compatible with it? Trying to search for "power" anything is a bit tricky since that's in the name of the device... The battery isn't leaking, but is there an internal I need to deal with? Thanks! | |
| Posted by: Shaddam IV on 2024-01-18 00:53:22 Perhaps this? It's made for Germany but I'm sure you'll find similar offers in other countries. 
Apple PowerBook Duo 230 kompatibles Netzteil/Ladegerät | eBayKompatibles Netzteil/Ladegerät. Das Netzkabel hat einen versiegelten Stecker. Apple PowerBook Duo 230.
www.ebay.de
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Posted by: imactheknife on 2024-01-18 04:24:27I have a PowerBook Duo 280 (greyscale) with a bunch of accessories... but I can only locate the PowerBook at the moment. The charger, floppy drive, ethernet adapter (memory might be mis-serving me here on this point) are somewhere in the house packed away.I use my yoyo from clamshell ibook, works well. Should be easy enough to find those still. Original might or might not work as caps are old. | |
Posted by: ururk on 2024-01-18 06:11:35I use my yoyo from clamshell ibook, works well. Should be easy enough to find those still. Original might or might not work as caps are old.Thanks for the tip - I wondered but never checked the specs. I should be able to locate one at work to test with. | |
| Posted by: GRudolf94 on 2024-01-25 20:31:50 Has it been recapped? Duo 280s WILL DIE if C72 has leaked/degraded. U2 (I think) shorts out and the 5V rail is shunted to the 24V of the DC input, killing everything inside. | |
| Posted by: ururk on 2024-01-25 20:33:11 It has not been recapped (nor powered on). I don't object to the idea of taking it apart - should I take it apart and inspect? | |
| Posted by: ururk on 2024-01-25 20:34:01 Or is it once the cap leaks it eats away at the circuit board? | |
| Posted by: GRudolf94 on 2024-01-25 21:55:54 It slowly eats away, but the real danger is in plugging it in - you happened to be lucky to not have the power adaptor. It really is a matter of replacing, not just inspecting - every 280 out there is bad by now. | |
| Posted by: ururk on 2024-01-25 22:33:09 Great. I searched a bit (here, YouTube) - any guides for this I should be aware of? Not so much technique - but rather where the caps are, what suggested replacements are (tantalum, ratings?). I'm in no rush to do this. | |
| Posted by: GRudolf94 on 2024-01-25 22:45:46 Can't point ya to any guides, but there's a half dozen under the upper frame, next to the power connector, and the one you should be most concerned about is immediately visible once you lift the keyboard, next to the 2nd transformer you see. I like Würth's solid polymer caps as replacements, you can replace like for like. MacDat has a cap list, probably. | |
Posted by: 3lectr1cPPC on 2024-01-26 08:53:15MacDat has a cap list, probably PowerBook Duo 280c Cap Reference - MacDat
macdat.net
Don’t have photos yet for this one. I have a strange feeling that someone at some point may have sent one for the logic board that I just forgot about though… | |
Posted by: Powerbook27364 on 2024-01-26 13:33:40Has it been recapped? Duo 280s WILL DIE if C72 has leaked/degraded. U2 (I think) shorts out and the 5V rail is shunted to the 24V of the DC input, killing everything inside.Is this true for all of the duos or just 280? Specifically wondering about 2300c and 230. I do have a photo of the board if you would like it. (280c and 280 use the same logic board) | |
| Posted by: 3lectr1cPPC on 2024-01-26 14:51:10 You may have already sent one but I don’t remember… you’re welcome to send it again if that wouldn’t take too much of your time. | |
Posted by: Powerbook27364 on 2024-01-26 16:02:55 | |
Posted by: GRudolf94 on 2024-01-26 16:47:57Is this true for all of the duos or just 280? Specifically wondering about 2300c and 230.I don't have a 2300c so no data there. The same thing probably applies to 210-270 but in less stern fashion (DC-DC design is similar but not the same). I just know it is absolutely critical on 280s and running them for 30s with a bad cap there can be a death sentence. In my case, a recapped 280c had the MOSFET fail _with a good cap_ because it'd already been damaged by the seller futilely testing the machine. | |
| Posted by: Powerbook27364 on 2024-01-26 16:59:44 I must have been super lucky. I didn’t know that with my 280 or 230 and ran both for maybe an hour each while testing. I have recapped both but haven’t used the 240 more than maybe a few minutes since. I used the 280 for dozens of hours since and it is still going strong. The capacitor is in a different spot on the 2300 so hopefully that is alright when I get it. | |
| Posted by: GRudolf94 on 2024-01-26 17:01:13 Maybe yours just isn't a fishy mess yet. Who knows how long both of mine spent on a charger before they got whacked onto ebay as "for parts". I'd eventually like to own a good one, still. | |
Posted by: Challenger 1983 on 2024-02-28 20:07:53View attachment 68747Sorry to hijack this thread but does anyone know the specs of the two transformers near the power jack, I need to replace the one closest to the power jack | |
Posted by: GRudolf94 on 2024-02-28 20:11:54Sorry to hijack this thread but does anyone know the specs of the two transformers near the power jack, I need to replace the one closest to the power jackThey're custom parts. Essentially irreplaceable, short of measuring turn count and rewinding a new transformer over the same core. | |
Posted by: Challenger 1983 on 2024-02-28 20:16:01They're custom parts. Essentially irreplaceable, short of measuring turn count and rewinding a new transformer over the same core.Unfortunate, I'll have a look through my parts bin and see if I can find another board | |
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