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I believe the main difference is that the 6500/5500/TAM Gazelle board, like its Alchemy 6400/5400 board predecessor, has a 3.3V rail, where the earlier boards in this form factor do not. You can see the pinout of the power section of the edge connector here (red = 5V, yellow = 12V, orange =...

Has the PCB been cleaned after recapping? Cap goop can cause all sorts of headaches if not cleaned off the board. If this has been done and the board is clean, I'd suggest looking at the area of the board that deals with the video circuitry (basically the area around the VRAM slots). Especially...

It's funny, in PCs and Amigas, finding a Varta battery is something to be dreaded, because their NiCd cells generally leak and cause tremendous damage to the PCB. But in Macs of this era, it's generally a relief to find a Varta battery, because their lithium cells are the opposite; Not only do...

You'll have to take off more if not all of the upper cover, increasing the risk of dust contamination, as well as the top head magnet to fit those, which incurs the risk of disturbing the head too much vertically and breaking the drive. So yeah, it is cheaper, but also riskier. Just depends on...

Not the first time I've seen IC salvagers from China and such take this approach. Honestly, I prefer it over desoldering, because they have some truly dodgy ways of doing that, like holding PCBs over hot flames and just slapping the board against a surface 'til they fall off 😬

Hitting them with a bulk eraser can work wonders. I've gotten disks back from the brink that had no physical damage, but needed a good magnetic scramble to even things out and get rid of stubborn sectors. A bad quality disk however, will always be bad quality, this is mainly just with good...

It's indeed a nice bonus to find a hidden accelerator! My Performa 600CD came with a Sonnet 040 accelerator, which made the 30 euro price for it all the more a steal :-)

Looking at the board, it does appear to be temperature controlled. The TC648 IC, located under the 3 pin fan header, is a fan controller, capable of temperature based PWM control, based on temperature readings from a thermistor. Which is precisely what component RT1 is, located right above TC648.

As mentioned before, Kai doesn't browse this forum anymore, from what we know, so you sadly won't be likely to find the answer here. He's active over on https://tinkerdifferent.com, so it might be best to try and contact him there, or to start a thread about it.

Yes, you can pull the yoke off the neck. As this CRT is broken, you don't have to be super careful doing it here (can't break the tube more than it already is), but do be careful fitting it on a replacement CRT, if it doesn't have the same yoke, if at all. All CRTs are compatible across the 9"...

And the $25k stretch goal for screw cover clips and power button pieces has been met as well! Great success!

Just $519 shy of the stretch goal to have the screw caps fabricated too, hoping a few more bezels get claimed in these last few hours so we can get those too :-)

Not too surprised it's still PowerBook 520/540 grey, I always assumed the 550c was black due to the fact Apple stopped producing the 500 series before the one-off 550c Japan launch, meaning they weren't producing plastics with that coloring (would have probably been expensive to continue to...

That is correct. As for intercompatibility between boards, it seems that most manufacturers did adhere to some sort of standard pinout. In my SE, I'm using a Novell EtherPort SE (which is a rebranded Shiva card as far as I can find), with a spare SE/30 DynaPORT breakout board, as I bought a...

A quick hack to make this is to just get an ATX PSU extension cable, and cut down the male end to fit the Mac logic board plug (the rest of the connector hanging off the side would likely collide with the PDS card in this case). As long as you plug in the analog board cable the right way on the...

Haven't seen it explicitly mentioned here, but static pressure is also very important for fans like these. It has to pull air through the entire system, so it deals with a lot of resistance. This makes static pressure incredibly important, and generally higher static pressure results in more...

This drive may be one of the exceptions of wide disks working with only narrow termination applied. If it's showing up, and works reliably after formatting, it pretty much confirms that. A handful of U160 drives, and very few U320 drives, can work without the full bus terminated. Why some do and...