This SE/30 has so many issues, so let's fix it #repair

Ah yes, this board is presenting multiple faults but I can't let that stop me from getting this awesome 32bit Macintosh working again.

Part 3: This part!
Part 4: Coming soon

-- Links

Using internal Mac diagnostic modes:

Original document on the Diagnostic protocol:

Replicated Schematics of the SE/30:

Mac SE and SE/30 PicoATX PSU adapter:

RGB2HDMI:

TechStep Photos:

TechStep Replica:

Adrian's Digital Basement Merch store:

Adrian's Digital Basement ][ (Second Channel)

Support the channel on Patreon:

My GitHub repository:

-- Tools

Deoxit D5:

O-Ring Pick Set: (I use these to lift chips off boards)

Elenco Electronics LP-560 Logic Probe:

Hakko FR301 Desoldering Iron:

Rigol DS1054Z Four Channel Oscilloscope:

Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:

TL866II Plus Chip Tester and EPROM Programmer: (The MiniPro)

TS100 Soldering Iron:

EEVBlog 121GW Multimeter:

DSLogic Basic Logic Analyzer:

Magnetic Screw Holder:

Universal ZIP sockets: (clones, used on my ZIF-64 test machine)

RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)

Plato (Clone) Side Cutters: (Order Five)

Heat Sinks:

Little squeezy bottles: (available elsewhere too)

--- Instructional videos

My video on chip removal without damage:

--- Music

Intro music and other tracks by:
Nathan Divino
@itsnathandivino

[networkg]

Adrian is the champion of evidence based, critical thinking repairs. He has me spoiled as I cannot stand it when other online 'repair' videos start off with massive chip swapping. They teach me nothing. Adrian's video's always leave me feeling that I have learned a new skill.

[TheDiveO]

absolutely appreciate his grin when Adrian after a considerable what-happened-so-far goes into his signature "without further ado..."

[phil]

I worked on the NCR 53C80 SCSI chip as an engineer. I am glad it was a wire fix rather than replacing another PLCC.

[CaptainSouthbird]

Adrian, you are a shining light in some old geek's life. I've been around computers since they first started screaming to AOL for their hourly usage. I cannot believe how incredible all of your videos are, and my god, I almost wish we could be on a repair venture together. The passion, your emotional reactions when they just "Freakin' Work." You're intoxicating, keep doing what you do, this is some of the best things to see in my life. Thank you for everything!

[jandjrandr]

This is 'FREAKIN' AWESOME!' I just love the process of getting to the conclusion of what wasn't working so it can be fixed.

[bennetb]

Sir. You are a modern day wizard. I love your break downs and showing your troubleshooting techniques.

[der.Schtefan]

I love the analytical approach, instead of just throwing out random ICs. Exercises critical thinking, logic, and analysis

[Vvardenfell_Outlander]

I don't know what makes this particular series so special but it's really just been so much fun to follow. Thanks, Adrian!

[trex]

Your joy after successful repairs is so nice to see. I don't understand much of what you do, but it's precisely because of your honest joy that I watch your videos

[FirChif]

Commenting mostly to appease the algorithm, but I love watching the process of working through random issues and get old stuff working! Thanks for another video Adrian!

[thirstyCactus]

Really awe-inspiring work. No board left behind!

[thcoura]

Adrian never gets bored. He makes his own adventure 😂

[twocvbloke]

Just shows how useful schematics are, like a roadmap showing you where everything goes, and helping you find your way about until you find where the stalled roadworks are and get them back to work... :)

[DerekDavis]

Just imagine all the great games and productivity software you can run on the SE/30. That high-res screen looiks amazing.

[sirgoodenough]

Congrats Adrian! Thanks for the journey!

[todayonthebench]

All these bodge wires makes for a rather pretty mess. Though the PCB designer in me screams about free hanging leads being potential EMI issues and causing all sorts of reflections and other issues. But at the very same time, this board doesn't really operate at a high enough frequency for this to be a major concern. But personally I would have cut the trace at the start and end of the bodge to ensure that as little of the "old" path isn't part of the circuit, this will ensure one gets as little weird reflection issues as possible as the signal bounces back from the end of the broken line.

Another tip for working with higher frequency signals is to run a ground wire alongside the bodge (a little twist and/or glue is a simple solution for keeping them hugged together) as to provide an adequately short return path for the signal, this will greatly improve signal integrity for single ended signals. (running a ground along a differential pair can likewise help at times, but differential signals are often more robust and rarely need this, even if they can complain about going over ground plain interruptions since they do still interact with their surroundings.)

However. It is important to note that one might bridge two parts of the ground plane in such a way that the ground wire suddenly sees a lot of current and burns up. My preferred 30 awg wire wrapping wire don't need much current to burn up This is rare on well designed boards but good to keep in mind. One can put a DC blocking capacitor on one end of the ground wire, but that starts being rather fancy for a bodge...

[radio-ged]

Two excellent, very satisfying fixes 😀😀😀

[Matrox]

This channel is gold, keep em coming Adrian, you rock!

[mikehensley]

Just another testament to how back in the day they made stuff to be fixed. Awesome fix!

[danwilliams]

This has been the best series in ages, kudos