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Well, since you said this: I thought you wanted to know what the sad chime represented. So if you check the response code at this point, you could see the major error code and the 32bit status. You can enter the serial test manager by pressing the NMI button to invoke it; but if it crashes...

Adrian Black did quite a deep of analysis of the diagnostic mode, building on the work of Rob Braun: The original doc by Rob Braun is available here, which you already found: https://web.archive.org/web/20210516085835/https://mac68k.info/wiki/display/mac68k/Diagnostic+Mode Adrian Black’s...

What's the response code if you enter *R?

You could connect another Mac to its modem port and use a terminal emulator to see what the error is.

What’s with the negativity?

One day, it may be possible to get a 68LC060FE inside the PowerBook 500 series. It would take a lot of work, but there's no technical reason it couldn't be done. It would be very silly though.

I always hear hard drive activity (my SCSI emulators have a piezo buzzer fitted) - I thought this was a feature of Battery Amnesia to use as much power as possible.

That’s pretty amazing @zigzagjoe - well done.

Could it be the fuse? I can’t remember if that affects internal drives as well.

Yeah a photo would be a good idea. I’m interested to know which utility is giving you this error. ‘No device connected’ does indicate that it can’t see the drive on the SCSI bus, but without seeing a photo or knowing the exact wording I’d rather not make an assumption. Probably either the drive...

Ah, nice. From the horse’s mouth.

Confirmed as in you’ve done it? Is there any more info or a write up?

Is this confirmed? I tried a 5300 battery in a 3400c and it wasn’t detected.

I still need to recap my IIci PSU. I’ve only changed out the RIFA films caps so far.

Better than the 3400c, though! Would an external battery charger help? Then just leave them with a constant trickle. Or even just leaving the PowerBook plugged in to achieve the same (although I don’t trust the stock AC adapter very much and would be wary of doing this).

Not sure what sort of diagram you mean, but I don’t think there is such a thing out there. If you mean just for the cells then it’s pretty obvious how to wire things up once you get the battery pack open. :) Be aware that others have tried to rebuild this battery and the BMS always gets bricked...

Sure, my 500 series machines are very prized, so am interested in their upkeep! I'm shocked that your almost-brand new cells leaked. Is leaving them discharged the likely cause?

I had the same issue, but used a T48 to program it.

I had a rebuilt battery that kicked the can, too. Turns out the EMM board just died. I moved the battery pack into another donor battery shell.

And IIsi units.