68kMLA Classic Interface
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| Embarking on SE/30 restoration | |
| Posted by: jamesmilne on 2016-04-27 08:40:46 I picked up an SE/30 off eBay, but it needs some TLC. I got a nice surprise when the unit arrived, as it's got an Ethernet card. It's branded Technology Works, which is a new one on me. As I expected, the battery had leaked and caused some corrosion on the PCB. The entire battery holder actually fell off when I removed the motherboard from the case. After gently removing some of the leaked battery fluid & corrosion, it doesn't look too bad, but there are two immediate problems: - crystal Y1 is gone - RTC pins are pretty badly corroded - capacitor C12 is also affected I also fear some of the vias may have been affected. Y1 is apparently a ~32kHz crystal. Is it possible to source a replacement RTC, or will I need a donor? One could probably replace it with a small modern MCU. I'm aware the capacitors will likely need replaced, although a cursory glance doesn't indicate any that are bulging or leaking yet. Any suggestions on what else to look for? I'm going to do a bit more cleaning with some isopropyl alcohol before embarking on anything more drastic.  | |
| Posted by: olePigeon on 2016-04-27 10:52:25 As far as battery leaks, I've seen a lot worse. Looks repairable. Your caps have leaked, though. I've never seen any SE/30 caps actually bulge, but they do leak. You can tell because the surrounding component's pins are corroded. If you're going to have your iron out, might as well recap it. | |
| Posted by: jamesmilne on 2016-04-27 11:55:50 Cheers olePigeon. Yeah, I'll order some replacements. Is there a re-capping guide as to which ones need replacing? If it's every single one, it'll take a while 🙂 | |
| Posted by: olePigeon on 2016-04-27 12:08:04 All of the cans will need replacing. You may not have to replace those axial caps, but might as well since they're super easy to remove. | |
| Posted by: jamesmilne on 2016-04-27 12:17:42 Just answering my own questions, there's a 68kmla wiki page on cap replacement: <https://wiki.68kmla.org/Capacitor_Replacement> | |
| Posted by: techknight on 2016-04-27 16:43:57 chances are, that board is garbage, and youll need another one. | |
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