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How did you know that you had to change those two chips? Were they visible damaged, or did you measure somehow? With shaky hands I managed to replace UJ3... It's not pretty, but I now have continuity on pin 4 again, and pin 12 is not shorted to pin 11 and 13. Unfortunately the replaced chip...

I think this RCMUX connection is wrong:

Step 1 done...

This is so great, thank you!

Ok, so found an error. Pin 12 on UJ3 shorts to pin 10 and 13. And pin 4 has no contact with the board. Have no idea if this error has been there all the time, or if I've caused it with my messy cleaning and re-soldering... But UJ2 and UJ3 were the most damaged components on the board. Maybe I...

So, I started over with my continuity check. Documenting everything so I don't miss anything, and what's left. So far: - from ROM chips pins to ROM SIMM fingers - from ROM chips pins to ROM SIMM connector (backside of the board) - from ROM chips pins to UK6 - from ROM chips pins to GLU chip...

Thanks, that will now be my next step. So far I have tested connectivity to UK6, D4-D19, UJ2, UI2, UJ3, UI3 and UJ4. All good so far.

Or maybe the first tone isn't the regular chime? It sounds weird.

Update: after cleaning the board again, I now have sound. A very loud and clear chime (of death). First the regular chime, immediately followed by the chime of death. If this can say anything about where in the boot process things go wrong. Now I'm uncertain what do next...

Ok, that's good to hear. Thanks!

I haven't cleaned the contacts with a fibre glass pen (only cotton swab and isopropanol), but I've already checked the continuity between the SIMM and the solder points on the back of the board. Everything seemed fine. All replies so far suggest the issue might be related to the ROM SIMM. If...

Yes, just tried it. No change unfortunately. The ROM sits very tight as it is.

Thanks for the advise. I've check the ROM and socket, and I don't think it can sit more tight than it already is. :( Another thing. I just did new voltage measurements on the external floppy connector, and I have no -12 V on pin 5. What I have: Pin 10: +5 V Pin 8: +12 V Pin 7: +12 V...

Yes, it looks like it exploded. I've tried to clean everything with a brush and vinegar. And then isopropanol. But the alcohol leaves a lot of white residue for some reason. I'll think about resoldering the SMD's, I just don't want to mess things up more... Now I just inserted the ROM and then...

Here's the board after the re-cap (please excuse my messy soldering technique!). Picture of the ROM: Battery is removed now, one of the leads on the battery holder was so damaged it broke off. I've tested continuity on all caps according to this, and it was all good: I didn't do...

So backstory. I recently got a SE/30. I knew it was working, but nothing more about the condition. The first thing I discovered when I received it was that it was an old SE FDHD, upgraded to a SE/30. I turned it on and noticed that the sound volume was very low. The second thing was the...

Plus in the "About Finder" box: But I just discovered that the Swedish translator preferred "Mac" over "Macintosh" :( :

I find it strange that they'd use "Hard Disk", like in the 1988 SE/30 Owner's Guide, if all Macs with internal drive had "Macintosh HD" as their name. But maybe it's time to end this quest now. I think I've received an answer to my original question. There never were a definitive switch from...

From MacUser Jan 1991: System 6, "Macintosh HD":   From MacUser July 1991: System 7.0, "Hard Disk":

Good find! What OS version is that, 7.1-something?