NC6320 Power Supply Pinouts required please

Question

I have an NC6320 which the PSU has failed on. Whilst waiting for the new one to arrive I bought a Trust universal adaptor, the HP adaptor supplied with it has fallen apart and I am now stuck. I need to know, when looking into the HP plug the voltages as you look into the end,
i.e O o .
These represent the outer metal connection the inner metal connection and the pin. They appear to be separate once you cut open the adapter
I have a variable power supply and I have cut up the broken adaptor, which the connections have broken on so I cannot find out from that, has anyone any info on which is the +ve and the 0v?
If anyone can I help I would be most grateful
regards
Richard

Answer 1

Posting for others who also later find their way here for answers:
The power supply N193 for my Pavilion DV7 notebook uses the center "ID" Pin so that HP can control which power supplies are used on their products, only their own. I suppose there could be two reasons for this, one to make sure the proper power supply is used and second to keep competitors from selling us replacement power supplies but the former reason is probably the real one.
I've done a search on this subject because my power supply has been slowly becoming erratic and today finally failed. I cut the DC side of the cable off near the power supply and have tried to measure voltages coming from it, nothing, zero. There are three wires, the center "ID" wire needs a voltage there or the computer won't power on. Here's the info I found on another web site called fixya dot com which I used as a guide to allow me to use another manufacturers power supply with the old connector plug from the HP power supply which died. I simply put a 1/4 watt 47K ohm resistor between the center ID wire of the cable and the +19 VDC wire and insulated it from the ground wire using tape. After you do that you can just wire the plus and minus or ground wires of the new power supply to the DC power cable from the bad HP power supply together as normal. The +19V wire goes to the inner shell of the DC plug and its ground goes to the outer shell of the plug. I was able to get the replacement off the shelf power supply on a military base in Afghanistan, where I am at. I can't wait two weeks to get something in the mail, had to fix this myself.
I would have included the full URL to fixya.(com) but this web site won't allow us to put URL's so here's the info:
Here is a cut and paste of the text:
I found the solution - and implemented it, it works. The blue (ID) line needs to show 7.5v. The simple way to acheive this is to simply put a 47k resistor from the +19.5v line to the ID line. Apparently there is a pull down at the computer end that means it ends up at 7.5v.
I cut the cable about 6" from the old HP power supply. I then soldered a female power socket onto the loose cable and soldered the 47k resistor between the ID line and the +19.5 line. I then plugged this onto my two pin power supply and the plugged it into my computer. It works very nicely.
Not wishing to junk the HP power supply unecessarily - it was still producing the 19.5v - I then soldered a power plug onto that ignoring the ID line. That now works as well. It seems that the circuitry that provided the 7.5v ID voltage in the HP power supply became flakey. I could have just opened up the power supply (I have already done that) and disconnected the blue line from the circuit board and just tied it to the +ve line via the 47k resistor and then wrapped it with the usual insulating tape.