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Shoot, that's a shame. I tried two known-good 800K drives on the external port and they both failed to operate on my SE/30 but worked on my SE. The SCSI connection for the hard drive (in this case a SCSI2SD does work. Looks like swapping the SWIM also isn't an option because the SE (which would...

Hey folks, I've got an SE/30 that I started working on a few years back. I got all the caps replaced but I wasn't able to get the floppy drives (internal or external) working, despite cleaning and lubrication. At some point I made a mistake while probing for voltages and accidentally shorted a...

Hello again, It's been a while since I updated this thread. I've decided to pick up this project again but I'm still stuck in the same place I was in September. That is, the machine bombs if I try to shut down, restart, or press the interrupt button. No floppy port is functioning either...

More update: with some assistance I've identified that the voltages across capacitors C8 and C9 are inverted. The PSU is outputting healthy voltages as far as I can tell (though the -12V line is running at about -10V). Any ideas?

As an update, neither floppy drive on my SE/30 is functioning now, including the external. The external now will not even power on. On top of that, I now get a "bus error" when I try to shut down the machine. The restart button on the dialog just causes it to do the same thing, and the interrupt...

The voltages are definitely reading negative, unless for some reason the red probe is supposed to go on the ground pins. Pin 9 is measuring around -7.5V. Something of note: pin 11, which was reading -7ish V yesterday is now 0V (on both machines). The machine which was previously working can no...

I just got a chance to check the voltages here. On both my SE/30 (issues) and SE (known good), pins 13, 15, 17, and 19 are measuring around -12V with pin 11 measuring between -7 and -7.6. You mentioned they should be +12 and +5, so the reversed polarity seems a bit weird to me.

I'll check the link, thanks. I've tried both ribbon cables. They work in the SE, but not the SE/30 (the one with the issues).

I resoldered the floppy header, but it seem to no avail. It still is unable to recognize disks. I did try to format an 800k disk I had lying around, and it said it was unable to initialize it. As for the above pinout, I'm afraid I'm not sure which diagram you're referring to.

I don't remember what happens if I try to format it. I'll check this week once I get the machine reassembled. Right now I've got it torn apart to check those traces and joints.

When I insert a disk in the internal drive, regardless of the type of drive and type of disk, the OS tells me the disk is unreadable and prompts me to format it. The disk and one of the drives is known to be good and works fine in my other Mac SE.

I found that the things pointed out were most likely a combination of bad lighting and dust/cotton swab fibers. I've cleaned up the areas a bit, so here are some new pictures. I still can't find anything particularly worrisome.

I did the capacitor replacements myself. Can traces be shorted if they aren't exposed on the surface? I'll have to check them more closely when I get back on Monday. Thanks!

Thanks for pointing that out. I looked over the top and bottom of the board around this chip and I didn't find any obviously bad traces, but my electronics skill is minimal. I've attached some photos in case anyone can see anything that sticks out to them.

I guess that wouldn't surprise me terribly. The board wasn't in great shape when I started the repairs; corrosion everywhere. Which chip is that so I can inspect it?

It only fails to recognize disks in drives connected to the internal floppy header. The same 800k drive works externally. The original internal drive is a 1.44 MB drive, which just doesn't seem to work in general. However, if I plug THAT drive in externally, the head moves a little bit but the...

From what I've read, the Bourns filter going bad generally causes an unresponsive gray screen on boot. In this case, the system does boot fully and if the system disk is removed, it will attempt to read from the internal and external floppy drives. The problem is just that it thinks that all...

I'm curious; what about the symptoms brought you to that conclusion?

I'm so close to being finished with my SE/30 restoration. Initially, it had the 1.44 MB floppy drive connected internally. After fighting with it for weeks, I pulled my 800k drive out of its external enclosure and installed that in place of the 1.44 MB. Now, when I insert a disk I'm prompted to...

I know this is a significant bump, but I've now gotten everything on my Mac SE/30 working except for the internal 1.44 MB floppy drive. Any suggestions you can give are greatly welcomed, since this is the last thing I need to get done before I put the machine back together. Thanks.