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Crap that’s exactly what I did. *facepalm* Thank you.

IIsi has visibly swollen capacitors so I ordered some replacements. I got the little square tantalum ones because I read they don’t leak. I double checked the markings and supposedly they are 47uf 16v, which should match what’s on the board. https://a.co/d/6pa0oPv Installed the first one...

So, I have one of these with the Mitsumi switches, and it had ten dead keys. I was able to do the “take it apart and bend the spring back” on seven of the ten, but the other three continued to have intermittent or nonexistent contact. Unfortunately it was an Apple-specific part. Salvaged and...

I'm curious about the little metal square over the read/write heads. What is that for? (Visible in this photo: link - the left drive has its "hat" and the right one does not.) I figured they were dust protection or something but I have a drive with one missing, and if I install it in its proper...

Did you check for shorts in the DB/AB connectors? When I recapped one of mine recently I reflowed the connections, as one does. But my soldering-noob-self accidentally made bridged composite video signal to ground. Careless. But it gave me a black screen and other symptoms were very similar to...

A bent/unbent pin or two shouldn't be a big deal. If the ROM chips were bad I don't think you'd even get the sad mac. Contacts can look fine and still have some scum on them causing problems. (I don't know why but dust seems to trap grease in certain environments and create a sort of slime...

Yup, I googled TO-3 and that's exactly what I was talking about. Thank you for the link. I emailed DigiKey's customer service line and they also recommended the Central Semiconductor 2N6714. https://www.digikey.com/en/products/detail/central-semiconductor-corp/2N6714-TIN-LEAD/13663177 So I...

If the 5v line from the PSU is only outputting 4.1v you might want to start with recapping the PSU instead.

I recently recapped two Plusses and had similar issues; for whatever reason(s) I needed to spray contact cleaner on the ram sockets and clean the contacts on the SIMMs for both of them before they’d work reliably again, despite not having touched the RAM. Was weird. I just chalked it up to...

This.

Depending on the car, a new radiator fan might not be very expensive. FWIW. Salvage yards FTW. Check out car-part.com.

I had a similar issue with one; turned out the jack on the keyboard was making intermittent contact. Worked when I tested it at the angle that was convenient to my multimeter but, not flat on the desk. *facepalm*

So I emailed the ZuluSCSI seller, (who responds to emails way too fast. I think they might not sleep?) and it turns out the Plus is very picky about what drivers you use to initialize the hard drive image. I just happened to be using a premade image on the BlueSCSI that was ok. The default...

I heard somewhere (maybe a YouTube video about residential electrical work? I deep dived a bunch of those after I got my house) that the voltage/amperage required to screw with your heart is too low to show a visible spark/arc in most situations. So I tend to figure if you can see it you should...

Neat.

Hi! I have a problem with one of my Plusses that the repair book says requires the replacement of a resistor and the Q1 transistor, a Motorola U01. There's also some comments here and there implying that when doing repairs like this, you're supposed to replace the paired transistor in Q2. The...

I know OP fixed their problem, but many years ago I had a IIx that doorstopped itself when the PRAM batteries died. Just want to put that out there in case somebody is googling this later.

More RAM would let you stick your browser cache on a RAM disk. That was a trick we used back in the dialup days. Not sure how much it would matter now, since network connections are often faster than SCSI-1.

The internal blueSCSI uses a PC-style 4-pin floppy power connection. The hard drive power in the computer is provided by a 4-pin molex connector, which is also very, very common. Adapters are pretty common. https://www.amazon.com/4-Pin-Molex-Floppy-Drive-Power/dp/B0120G2Q4Y

Tinkerboy's store seems to have completely sold out. Was anybody else making something similar, or were the designs open sourced?