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You can test it. Some switching power supplies require a minimum load for their regulation to work correctly. I don't know anything specific about a IIsi power supply, it's been probably 25+ years since I had a IIsi in my collection. Often for small computer power supplies, the +5V line needs...

Fuse F101 appears to be missing, but there are end caps in the fuse holder?? Was there ever a capacitor installed at C116? It's not obvious from the picture if something was there previously. Maybe C302 is leaky?

Possibly, especially if they are part of the print head pin driver power supply. Also it would be prudent to check the cable that leads to the print head for breaks or being disconnected. This manual might be useful if you don't already have a copy. https://mirrors.apple2.org.za/Apple II...

And the print head is properly located so that if the printing pins will actually contact the paper? While it is attempting to print, can you tell if the pins are even moving? Maybe there is an issue in the circuits that drive the solenoids that actuate the pins.

If you can buy a sheet of the correct (or near correct) thickness, only cutting to width and height is necessary.

Oops, but at least you know which one to reverse now.

Maybe you can find a suitable closed cell foam sheet used to wrap items for shipment? That could be obtained in small quantities from a packing supply store or online (but maybe in larger amounts than you need).

Sounds like a bad capacitors issue. Maybe start with the power supply then move to the motherboard.

Does the cable have a solid fill for pin 17 or does it have one of those removable plastic filler pins? If it is solid, then you will have to break off pin 17. If the other case, then you can remove that filler pin, but be careful to plug the cable in with the correct orientation.

That's pretty uniform, so may be solder mask overflow or failed tented vias. If you didn't remove anything with the vinegar scrub, then you are probably good to go.

Wow, I can't believe the prices for a passive card I saw in a search. Unfortunately my dual G5 doesn't have that upgrade installed.

I had a further thought about this issue. Do you have a logic analyzer available? Even a small USB based one with 12 or 13 lines would work. We might be able to figure out if you have some bad solder joints at the SCC.

Cache card plugged into the wrong slot?

It isn't a law that I'm aware of, it is probably a requirement of the company doing the recycling. For example in Boulder County, you can drop off your electronics for onsite disassembly and recycling, and the description of the process doesn't mention anything about intact housings. There is an...

Ok, all I have is a crappy phone picture, I didn't get my good DSLR out to do a proper job. The moire pattern was caused by the phone sensor, and it doesn't look like that at all. The picture was quite good once I disabled the auto image scalling and increased the brightness setting. My...

I found an RGB-HDMI 300A at https://www.surpluscrestron.com for $53 delivered. It was a pull from service, and was missing the connector block for the power. I believe a connector like this https://www.digikey.com/product-detail/en/molex/0395000002/WM7732-ND/1280583 will work, I haven't yet...

https://stason.org/TULARC/pc/hard-drives-hdd/quantum/PRODRIVE-LPS-540-S-541MB-3-5-SL-SCSI2-SE.html I found this without using quotes on the search.

A search for "quantum 540s" will turn up the information.

For the keys that aren't working, do the plungers operate correctly? For the disassembly, the furthest you disassembled it was to the state in the second picture in the original post? I.e. just removed the keys and cleaned up at that point?

Yes the corrosion could cause shorts, higher impedance "shorts" or open traces.