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Swapping it into the SE is not going to help. A few things to try: Try one bank of RAM at a time in bank A. Clean the contacts on the ROM. But most likely this is due to a broken trace to/from the ROM or RAM or bad / dirty video mux. UE8 (74F253) is a common failure point due to its proximity to...

I've corrected some stuff on the top enclosure and created the bottom enclosure model. I'll try to make a test print in the next day or so.

Top enclosure draft done. Will hopefully get the bottom done later today and will attempt a print shortly after.

Well, conveniently, someone recently did all of the hard work. Yay! I'll work on an enclosure.

I recently got a TechStep working and of course am interested in getting the full set of ROMs. They're quite hard to find, so it might make more sense to just recreate them. The enclosure geometry is a bit complicated but should be fine to print in resin. The PCB is quite simple too. It consists...

My ROM B has generic SCSI tests on it.

It powers up with a power adapter but still not with the battery. It’s probably something simple on that DC-in board but haven’t been able to figure it out yet. Anyway, this is good enough for now :)

I replaced the ribbon cable with one that's a touch longer. The TechStep still does not display anything on screen and still doesn't show voltage at the voltage regulator. Back to trying to following the path from the battery more closely.

Maybe focus on the feedback circuit of the analog board. Consider changing the optocoupler and/or the diodes near it.

I came across a manual for the Macintosh Portrait Display, and it conveniently included a pinout of its quite hard to find video cable. Here it is in case you need to build your own.

The power jack is center negative. I expected something to be blown from someone connecting a more typical center positive adapter. I don’t think there’s any protection against that. hopefully all this needs is to have these wires reconnected. @splorp Have you opened yours up yet?

While double-checking the connections from the battery and barrel, I noticed the ribbon cable was a bit too wiggly. After pulling lightly I found the battery positive connection was broken. Hopefully reattaching that will fix the issue.

After years of searching, I've finally scored a TechStep. Unfortunately it shows no power with a good 9V battery. I haven't ordered a power supply yet, but suspect it'll produce the same result. Nothing is scorched and so far all of the joints I've checked look okay. However, 9V is not making...

A friend recently gave these to me as a thank you for something. I don't know the whole story, but it sounds like they were possibly a gift to people who worked on the first gen iPod mini. Regardless, they're now my favorite quirky accessory.

I'm restoring a couple of original Disk II drives which have rusty bottom screws and melted feet. I had a hard time finding documentation about their specs, so I'm posting this for anyone who needs the info in the future. The rubber feet are 3M SJ-5023-BLACK. They're 2cm square at their base...

The IWM or Integrated Woz Machine is the floppy controller IC. Perhaps check the solder joints or just give them all a reflow before giving up on this board.

Updated the description text to include the logic board part number. Changed C11 from 25V to 16V. Updated lead spacings to align with JDWs document. The mostly moved things by 0.5 to 1.0mm and added in lead spacings for the axial caps of the analog board. Added a column to note caps marked as...

Just for completeness, I noted the OEMs for each capacitor on this specific board in case that's interesting to anyone. I've noted 'Nippon Chemi-con' as marked, but I think they're now known as United Chemi-con.

Perhaps you need to update to 8.6 or 9 to get that drive working. How did you attempt to access it? Did you format it with Drive Setup? If it's formatted with a more modern file system it's not going to mount in 8.5. You can find QuickFTP on the Mac App Store. You'll need an ethernet cable and...

What are you plugging the USB stick into? I don't think they will work if plugged into the keyboard. The iMac has ethernet, so you could set up a simple FTP server on a modern Mac with something like QuickFTP and then download a client (Fetch/Transmit) from a site like Macintosh Garden. That...