Pinout for Powerbook Titanium yoyo power supply

I have a Tibook G4 with the old original circular yoyo power supply, but I presume the barrel connector that plugs into the back of the Tibook is the same for all Powerbooks. Is the silver colored barrel shield the ground? Is the gold tip the +24 Volts? I cannot get any of my three PSs to register on my voltmeter above the noise level using these two connection points. The gold center pin actually has 3 isolated portions, like a stereo audio jack. Are these used at all, or is just the tip used? It just seems odd that all three of my PSs could be dead.

Hi, Jeff. I can't help you with the pinouts or the voltages you should be reading between different contacts, except to say that on my own perfectly functional adapter, I don't get a 24V reading from any combination that I can get the probes to. It is true that the ringlight on my adapter plug lights up green when I test for voltage between the outer shield and the innermost pin contact, but the voltage is very low. Of course getting a meter probe to the innermost ring on the center pin without also contacting the outer cylindrical shield is a pretty good trick, and I haven't been able to test any combination of the three contacts on the center pin — it's just too clumsy. But my hunch is that unless all four contacts are in touch with the right parts of the DC-In port in the Powerbook, whatever is supposed to happen then doesn't happen and can't be detected. My suspicion is that you just can't do any meaningful testing with a meter when the adapter isn't connected to the PB.
The Apple tech service manual for the Tibooks says nothing at all about testing AC adapters, probably because if they work they work, and if they don't you throw them away. There's no repairing them — it's just not worth the time. When a perfectly good third-party adapter costs $50, nobody's going to pay a technician $100/hour to fix one. Therefore there are no instructions or documentation telling how to go about it.
Message was edited by: eww

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