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I got the replacement oscillator and now I have a 50MHz wave, but like the above poster, the IIci still doesn't boot.  I tried probing pin 6 of the 68030, which is supposed to be the clock input, but there's nothing there.  Does anyone know where that's supposed to connect?  I looked at the...

I'm trying to resurrect a IIci which had a Maxell bomb go off, which I caught before the damage was too bad, and only really ended up eating a couple of traces which I patched; I then recapped the entire board.  Using the ATX power supply mod, I'm able to get power to the board, but I have no...

Alright, I ordered all the caps I will need (cost me less than $10 including the huge ones).  I didn't really listen for the click, but then again, I wasn't really listening for it.  If the relay was clicking, then wouldn't that imply that I should be seeing voltage on the 5V rail, even for just...

So I've got my hands on a dead IIci, that came seriously dusty, and with a Maxell bomb having just gone off, but recently enough to be fixable (no rotten traces).  While I wait for the replacement caps to come in, I thought I'd turn my attention to the PSU.  First thing I did was probe pin 10 to...

What is the piece of plastic hanging off the bottom that looks like it prevents the drive from retracting all the way?

I put in the 4 sticks I got off eBay into bank A, which normally holds the 4MB this machine reliably boots with, and it sad macs; they're 3-chip SIMMs, and I've read here that the IIx doesn't much like those. The slots are all fine; there's one chip out of the original 8 that is loose in...

Well, looks like maxing out the IIx is outside my budget at this point due to how expensive those PAL SIMMs are.  I'd like to get it to at least 16MB or so, so these should work, right...

I bought some 1MB SIMMs a little while back but the IIx just sad macs, so I figured I might as well check here.  4x16MB SIMMs.  I know I'll need either Mode32 or a IIsi ROM to use them, but other than that, are these compatible?  Can I just stick the existing 4x1MB in Bank B...

There was a post here that had high resolution images of the entire board, but the embedded image links were all broken.  Here's a link to the actual images...

Speaker clicking but not chiming could be a ROM issue.  If the CPU can read the death chime from the ROM, it should play it.  I don't have a schematic for the Q700, but there's a good chance that chip is important (since most chips are).  At the very least, I'd start with replacing the...

I just finished recapping an SE/30 (logic only, I'll do the analog+PSU after I get their caps), and now I have a new problem.  When I cold power on the machine, I get a speaker pop, and the screen comes on with a blinking floppy as expected, but I get no chime.  If I then reset the machine, I...

Just a quick update, there was one more bad trace between the NuBus slots and the batteries; after patching it up (that's the 13th patch on this board) I get video out and the machine is working like a charm!  It has a physically enormous hard drive (5.25in half-height, the size of a CD-ROM...

That's the address bus.  That notation means that the address bus also occurs on pages 1-6, and is 32 bits wide.  The line you're looking for is A0, the least significant bit.  From a quick look through the pages of the schematic, it connects to the 68030, as well as to UK6 pin 10 and UD8 pin 4.

Could this be caused by a bad mux or demux (assuming the 128K has anything like that) causing the same data to be stored multiple times to the framebuffer?

I'm ordering the new caps for the SE/30 (and a Classic II and Plus that also need attention), but can't seem to find 50V 1uf tantalum caps.  Can I just use SMT ceramics for those?

I intend to :) .  But the SE/30 (which arrived today) is currently number 3 in line for my attention, which is currently on a Mac IIx and why I can't get any video out of it.

I'm still not able to get any video.  I'm pretty sure the machine is booting, since it chimes and then starts reading from disk.  I tried two different video cards (a Macintosh II High Resolution and a Macintosh II video card), at least one of which is known working.  Is there any way to narrow...

So essentially I can use any disk I want regardless of size, but I just have to partition it into disks of up to 2GB? Does this still hold true under A/UX?  I'm thinking of installing that on the IIx.

I have a number of Macs with dead/dying/untrustworthy SCSI drives (IIx, IIsi, Q660AV, Q475, PM9600, SE, SE/30, Classic II), I don't want to get a SCSI2SD for each of them, and I have a ton of assorted SCSI drives lying around that are a good bit newer than 1990.  I was browsing eBay and came...

You're referring to the discharge procedure for the CRT, right?  Will that discharge all the high-voltage caps (if there are more than one), or are there more I need to worry about?