68kMLA Classic Interface
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| Click here to select a new forum. | | Classic, LCIII, Plus, SI for for free | Posted by: ironborn65 on 2024-11-12 14:11:20
I was handed these Macs for free
The Plus went on fire ... what would you do with it?? | Posted by: finkmac on 2024-11-12 14:34:31
i would fix it | Posted by: ironborn65 on 2024-11-12 14:52:16
cool, but how? Repairing the analogue board? Replacing it? | Posted by: Snial on 2024-11-12 15:05:27
At least the flyback didn't go. | Posted by: ironborn65 on 2024-11-12 15:06:57
yeah, right, I noticed it.. it's a good start
😉 | Posted by: croissantking on 2024-11-12 20:09:59
cool, but how? Repairing the analogue board? Replacing it? Identify what’s burned up on the AB and see if it’s an easily replaceable part. If not, then get another AB. | Posted by: joshc on 2024-11-27 03:17:12
That's a nice little collection of 68k Macs for free, looking forward to seeing how the repairs go. | Posted by: CC_333 on 2024-12-07 22:19:28
Looks like the RIFA cap blew.
When they do blow, they make a big, stinky mess, but they don't generally cause any major damage from what I've read (I guess I've been lucky, for I've yet to have one blow in any of my machines, so I actually don't have any first-hand experience so far). I've also read that machines can usually continue to work without them, so once you clean it up, if you're brave, you can carefully try powering it on to see if everything else works as it should (somebody please correct me if I'm wrong!).
That mess looks pretty extensive though, so at a minimum before you do anything else, you should clean it up, remove the blown RIFA remnants, and then visually check other components in the area to make sure nothing else got fried. A general recap probably wouldn't hurt, either. This includes installing a RIFA-equivalent; as noted above, the machine would likely work without one, but I think it's a good idea to install a new one anyway for reasons I don't recall at the moment.
c | Posted by: joshc on 2024-12-16 23:43:10
but I think it's a good idea to install a new one anyway for reasons I don't recall at the moment. The short answer is, among other things, safety capacitors filter out noise; X caps are between line and netural, and Y are between line and earth. Without them, EMI/RFI noise could affect other devices - it's not a good idea to run a power supply without them. | Posted by: CC_333 on 2024-12-17 00:20:13
Yes, that's exactly right!
I knew it was important, but I couldn't remember why.
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