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Update: I fixed it! TLDR: It was the SWIM. Here's a summary of what I did: I downloaded a copy of the schematics for the SE/30, and verified with a multimeter that every pin on both the floppy connector and the SWIM was properly connected. All of the pins checked out OK. I also did the same...

The motherboard seems to be getting all voltages fine (+/- 5, +/- 12). The floppy connector also has 5v and 12v present. I didn't measure any -12v on the floppy connector, but according to the schematics it's not hooked up on the SE/30. Speaking of schematics, I guess I can use a multimeter to...

I've been working on repairing a Mac SE/30, and I've run into an issue. The computer won't read floppies, even with known working drives. A few months ago, it would read them fine, but suddenly it won't read them anymore. Whenever a disk is inserted, the drive will spin and occasionally seek...

That’s pretty much what I experienced. Guess that settles it, it’s probably a test pad. I guess I need to look around for more corroded vias then near the other capacitors then.

That's why I'm confused. Why have a trace+via that doesn't go anywhere? At first, I just thought it was possibly due to the fact that the schematics were reverse engineered, and thus possibly incomplete. However, it doesn't seem that way...

I'm pretty sure the via above R37 connects through on the other side directly to one of the pins of the oscillator. It also still has continuity on my machine, even though the blind via is gone, so I'm assuming the blind via goes elsewhere. Honestly, I'm beginning to think that blind via might...

I already got that part down. I’m actually trying to figure out the same in reverse, i.e. aftet leaving Y1 and going to the left side of c56, where does it go after disappearing into the blind via?

That pin of the oscillator is already connected to R37 via another via… My hope is that you’d just be able to blindly probe around with a multimeter in continuity mode to see if you can find a beep…

Just to be clear, I am referring to the pad pictured here. Are you sure it connects to ground?

I broke off the circular pad at the end of the trace underneath, and it doesn’t seem to go all the way through the board like a normal via so I don’t know where that pad goes.

I was following this guide. The trace I'm referring to is the one that goes down and to the right off of the left side of C56 in the second picture.

I've already looked at the Bomarc schematics, and either they are for a different board revision, are erroneous, or I'm not reading them right. It says that the left leg of Y1 connects to C36 (it should be C56) and R36. However, it makes no mention of the third trace I'm trying to figure out...

I just recapped my color classic, but it still doesn't work. After reading an older post here, I noticed that Y1 was disconnected from C56 due to a bad via. However, I had a little soldering accident and destroyed one of the traces/vias coming off of C56. Does anyone have a working color classic...