Good afternoon folks. I recently picked up a dead IIx. It wouldn't even bumpstart when I first saw it, but I'm not sure why as it sort of did once I got it home (it chimed and showed the happy mac before doing a weird restart with no chime - after a couple of times it froze). Note that it does not restart if there is no disks connected. Additionally, the video is pale and washed out, except once in a while when it is normal.
It is now a couple of weeks later and I've spent the weekend researching and repairing. I've fixed 6 broken traces and checked lots more in the power circuit. I've re-capped most of the motherboard (I don't have a replacement for the yellow 10uF or the axial 220uF (might have the value wrong - it almost faces the board!). The power on circuit now works from ADB and the button on the back.
Machine is a late variant (March 1990) and has a soldered CPU and factory battery holders (no funny little board or capacitor). 8mb of RAM, Radius 24 Pro XK, ethernet and a 540mb disk. At some point someone had a Radius Rocket in it, but sadly that is gone.
Does anyone have any suggestions for what might be wrong? I don't know the machine's history so it could even have the wrong RAM fitted for all I know.
1. Restarts silently without an error while showing the Happy Mac.
2. Video is washed out.
Youtube video for reference :
Alright, round 2!
Bit of an update: After much time and sparks, the Q610 is recapped. After following the idea of cleaning the cap areas and setting the termination jumpers correctly (HDD=0, CD = 3), i'm still stuck. No drives show and scsiprobe show the bus still as not terminated. Can anyone guide me as to what I should do? If pictures are needed, I'll send some
You're forgetting the proprietary Silicon on the board, very Apple that.
We've already got a cleaned up version of Apple's schematic ready for mucking about a bit from a ground up build. Has it been checked against the Bomarc schematic? I need to get at least the memory page of that version.
Don't get me wrong, I love the process of 1:1 repro work from an existing PCB and mucking about with it. That's really the only PCB "design" I've done, right down to sanding off the layers of a complex later 90's PCB, albeit the very small, PCMCIA/I/R daughtercard for the 1400 030 Bus.
I want to see what @techknight and the FPGA/CPLD boffins can come up with in terms of simplification/parts count reduction and hopefully a bit of modularization of Lthe ogic Board's block diagram. Two approaches, one from the top and one from the ground up happening concurrently should be beneficial to both projects I'd think.
Thinking PicoPSU/Plugged in only at first. After that a 24v battery pack that would match the three hour battery life of the MacColby SE30 might be possible?
Enough of this tangent! I'll do some doodling in AI and start a new hacks thread about my SE/30 Portable notions if anyone's interested?
Ha! The idea of a completely non-Apple SE/30 is great. Let's keep our SE/30s running indefinitely...
As part of the Classic II gang gang, though, I'm obliged to cast my vote for the Classic II... although it's got custom ASICs out the wazoo, so it'll be harder to do. Oh well, SE/30 it is.