Hacking up a PCP+C

K404

New member
Because I didnt feel like selling this PCP+C and buying the right kind, I decided to apply some ghetto modwork and change it to the XE layout most/all of our boards use anyway.



Heres the sockets marked out for the 2x2-pin connecter. Pretty wasteful, but they`re pretty cheap anyway.

To make the 2x2-pin plug that our motherboards need, the 8 pin plug needs to have 4 of its pins "tapped" and terminated in the plug. This 2x2 pin uses 2x+12V wires and 2x Ground. An 8-pin socket was cut from the molex shown above, and the 4 relevant wires were extended and terminated in the familiar plug, which was cut from the other molex. This leaves 4 open pins on the original 8-pin plug. These are: Ground, +5V, +12V and Power Good. Three of these can remain open, but the PG wire needs to removed as well for the 24-pin plug, which, in the A4 configuration, does not have this line.

Next, was to remove all 24-pins from the main mobo socket.



I bought some ATX removal tools for this, but promply broke the relevant one within 5 minutes, so resorted to using a very fine screwdriver. This worked fine, but care needs to be taken to avoid bending the plastic on the socket...we`ll need it later.

Next was to reconnect the wires the "right" way around. The A4 and XE style of pin layout have some differences in regard to the number of available wires for Ground, +12, +5 and+3.3V, some are in excess, some are in deficit. However, a closer look at the pins show that some connection pins have 2 wires running to them, so where necessary, these can be separated with a soldering Iron and used for other pins. As it turned out, I did not have to splice any wires to build up the number of needed connections.

Connecting up the wires is not difficult if one has the wire-map diagram (which I`ll hopefully post later), the only thing that is a must is confidence. The PG line liberated from the 4x2 plug can be used here to fill its relevant space. There is a mention made of a -5V line on the XE layout, but this is no longer needed by the ATX specification and can be left empty. *Thanks to Mindless-Moron for the link and the details*

Once all 23 (remembering the -5V line) pins are reconnected properly, it can be noticed that theres a few wires left over. Simply cover the ends with insulating tape and tape them tidily somewhere. Every time I work on something, theres always some screws, or bolts, or wires left over. It doesnt bother me any more. Do not worry if this happens...all the relevant socket holes are filled! If its really of concern, wires may be soldered together to keep the case innards tidy, but that can only happen with good planning in advance!



Lo and behold... all the relevant parts are finished and the PSU is now of XE standard.



The 2x2 pin plug should really have 2 yellow wires, but I didnt have any yellow kicking around at the time.

There y`all go..a quick guide to something very few of you will ever have to do. MORAL: Do your research first!

Kenny

Edit: Sorry bout the size of the pics, I dont have any software to make them a more sensible size at the mo.

AND: maybe more importantly...I havent tried the PSU yet. If it all goes pear-shaped tonight, I wont sleep. I`ll try it tomorrow morning
 
cool glad i could be of assistance make sure you test all of the connectors, and do it on a very old system, psu go bang on new stuff is not fun infact after it goes bang things get very boring very quickly.
 
Yea, I`ll plug the mians into the PSU, and trigger it by shorting the green and a black. Can check some of the voltages, assuming that they still generate with no load. Guess I could add a fan or 2 to it. :) I dont have a "spare" computer any more :( Sold the last of it yesterday. Ah well.... Will just try it on my flatmates rig when he aint lookin ;)
 
you must have some fans in your toolbox, i have some spare pc's i need rid of, i always use an old qtec (shock gasp horror) when testing fans that i've 7v/5v i was actually quite worried hat maybe i'd blow a fuse or have to go and flip the breakers lol.

i once made an adaptor for 3 pin fans which 7 or 5 volts them, useful little gizmo, especially when testing high output fans.
 
All I needed was a recommendation..Panaflo it is :) Gonna do the volt-mods for my mobo this afternoon, and assuming I get that right, The fan will be changed next week :)
 
remeber panaflo's dont start until they get 4.5v going through them so sometimes you fans might not be spinning, but an efficent psu cna cope without it, if it gets to ohot it will up the voltage to that which the fans can start.
 
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