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The adapter provides power to the ZuluSCSI via the termination power on pin 26, supplied via the diode connected to +5V.

That sounds right, though it sounds as if your capacitor is draining a bit in between tests, which is probably normal to the spec of capacitor you used to test. It's not the most accurate test either, but it at least verifies basic functionality of the capacitor.

All of that sounds normal. 1 Amp is typically good enough to run without the hard drive, but I typically see the total draw of the system around 2.5 Amps when the hard drive first spins up. Was the computer running? There's quite a few different variables here, so it's hard to say which is at...

Yes, connect the bench power supply to the battery terminals or the 4-pin connector on the board. If you connect to the battery terminals you will need to have that switch pressed down. If your wiring allows there's a few different gaps where you can have the wires come out while the battery...

You can do a basic test to see if it's working at the very least. Remove the capacitor from the board and set your multimeter to test resistance. Short both ends of the capacitor, then test the resistance across it. It should very briefly show high resistance increasing then show overload or...

It's not a great solution, but if you drill a hole at the end of the crack it will stop spreading. I've tried super glue, but it didn't hold and discolored the inner surface where the signatures are.

If possible, remove it from the board and test it with the capacitance setting on a multimeter if you have that available. Or just replace it if possible. I just put together the main clock circuit since it's not too complex: You can also see a similar effect in a circuit simulator, but this...

You could likely copy it, I'm not certain if it needs some sort of extension as well, I'll have to look later. It may vary based on what system version you copy it from, try the one named "Portable" or something as well. You shouldn't use a PowerBook charger with it, as it may supply too much...

The system disk you're using is probably the bare minimum to run the computer, it doesn't have most extensions and other things you would get from the installer. You may need to use install disks and install to a floppy disk to get the proper system extensions. What you're describing with the...

Do you have the Brightness control in the Control Panels? If you don't have the right system software installed, the backlight usually won't come on. Here's System 7.1 for example:

I did some more experimenting, and I think you should check C23. I was able to replicate what you're measuring in the clock section by removing C23 from the circuit.

Which Portable do you have, the M5120 or the M5126? Do you have a multimeter to check the voltages at the molex power connector of the adapter, with the ZuluSCSI disconnected?

Most of those look fine. Looks like you're getting a good supply voltage and the voltage divider resistors are working fine. I think the tricky part is there's both an earth/shield ground and a signal ground, so if you're referencing earth ground you might not see 0V on the signal ground. If...

When you say "flat" do you mean low/no voltage or just a flat waveform? Can you check what voltage you see on each side of R48?

Rumor I usually see is that the colors came from the United Colors of Benetton, which was an event sponsor at the time. I don't know if this was ever confirmed though.

You could at the very least try it with a blank, as far as I know the drive won't attempt to read just by receiving power, the computer has to actually take the action. The IIfx has the SWIM, so both 1.44MB disks and 800K disks should work fine, and it should accept both System 6 and System 7...

I'm not sure if I'm missing it, but it doesn't sound like there's enough hard drive activity there for booting. To me it sounded more like just the drive's startup routine, likely reading some data off the drive or performing a test. Have you tried putting in a floppy disk to see if it makes any...

You can use the official service manual - https://tim.id.au/laptops/apple/legacy/classic_ii.performa_200.pdf Specifically you would want the procedure at PDF Page #107, or Page 18 of the Adjustments section.

Yes, the ROM slot is between the modem and RAM slots. The card has an 8 wire cable coming off for power and signaling to the backlight inverter. Yes, although the computer usually needs a keypress to power it on, so you may need to connect the keyboard if you want to test it past the powered...

Is this the M5120 with the backlight addition, or the M5126? Only the M5126 had a backlight, though you could get a backlit display with accompanying ROM card to add a backlight to M5120 The system will not function properly without power via the battery connector, due to both the current...