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I did this for my first two boards and it’s a great idea for testing chips, although I’ve damaged a few cosmetically during removal even with a chip puller, so take care with that. The chips need to be very clean before they’re inserted, so that’s one thing to check - one of them might not be...

Available modes on a trayloader iMac when connected to an Apple Multiscan 15AV:

Sorry if I misunderstood you. Good luck with the fault-finding, interested to see if you get it working.

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).