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My bet is you'll need a new HOT (horizontal output transistor). I've replaced ~5 over the years. They fail in the manner you describe. Should still be available from sellers like DigiKey!

I know this is an obscure piece of Apple hardware, but I think they're neat because the color matches the old PowerBooks. I have two of these - one working and one not. Because I couldn't find any photos of the base online, I disassembled my defective unit to take a look around. For what it...

Nice score! One of my favorites. Embarrassingly, I've paid much more than that just for a black keyboard, so I'd say it's a bargain even with the logic board exploded. An LC550 board in there would be a great speed boost and wouldn't require modification to the back panel (to my knowledge)...

That resistor should be 4.7 ohms, which some meters may determine as low enough resistance to beep “continuity”. What does the meter say in resistance mode?

Wow- great find! Where’d you come across that manual? Are these scans of your original?

Great score! Caps are likely fine for now, but you’ll want to pull the PRAM batteries ASAP. Remove the keyboard (three screws from the back), then you’ll remove the speaker assembly (one screw upper left side, and you’ll find the green PRAM battery stuck to the backside of the speaker assembly!

Yes, correct. I didn’t take a photo after everything was repaired.

I actually just worked on another SE/30 with this same problem. Same solution - trace from UE8 to one of the VRAM chips!

Is the bluescsi.ini configured correctly? How far are you from your router? Can you post a screenshot of your MacTCP configuration window? There are a few things to get set up before it'll all work properly!

On the original Performer card, the FPU will run at 16MHz unless a separate 25MHz oscillator is installed. Not sure if MacEffects is claiming the FPU is running faster than the 68030, but based on the photos on their site, it's going to be 16MHz. Either way, a great improvement to a stock SE!

I'm happy to do a dump of my ROMs for you, if they're needed. Is your card working? I wonder what those jumpers do. If I had to take a guess on the crystal, I'd guess it is for the external video option.

As someone who has done the "hardware" overclock on my 475, I also moved a resistor to keep the SCSI controller at 25MHz (R96 to R95 - see photo). Is there any indication whether or not a software overclock would affect SCSI? I have seen file transfers cause lock ups, reportedly caused by SCSI...

Yes, I know it's comical the amount of threads started because of the infamous IIsi power supply. Naturally, I'm joining in the fun and creating another! Hopefully this will spark more discussion around what could be the culprit with them. Okay - here's the issue with mine: it powers on, then...

I haven’t fixed the issue yet, although I did check and verify that D12 was not shorted. Good call on the factory reset. Maybe the ROM got corrupted somehow. I have a programmer, I suppose I could check that as well to see if it’s software related.

The exact same handpiece and cart are working fine on the right port, so I think it’s safe to eliminate it as a suspect here. Good train of thought though!

Instead of starting a new thread, I figured it'd be more effective to post here, as I'm also working on a 5200 power supply. My unit works well with the right port, but the left is hit-or-miss. If I connect the hand-piece to the left port and leave it in the auto sleep work stand before power...

Pin 7 must be grounded on the edge connector. I used a paper clip as a little jumper. All you need to do is make contact. Yes, a standard Apple serial cable will work fine!

I'm gearing up to do something similar. I plan to rip out the old treads/risers and install oak direct on the stringers themselves. So much harder with an infant! I can't make too much noise or dust like I used to...

Might be a "hot take" but I really love listening to Power Windows. I know it's synth heavy, but if I want to get away from that I can always put on Vapor Trails! Rush is my favorite band too. I've been fortunate enough to have seen them live 4 times.

I’m not sure what the FF00 exactly is, but I agree that the 3 is a RAM fault. The minor code is marked by the FFxx as seen below, except this guide shows nothing for the 00 you’re seeing… I wish I was more help!