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A simple high quality 12Volt 100Amp Power Supply- Part1
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Nov 15, 2011
, 10:45 AM
United States, CT, East Hartford
Joined May 2010
IBM Bladecenter 2000w PSU DPS-2000BB A Revison S9 voltage control mod.
Revisions S9M and higher for the IBM Bladecenter 2000w PSU DPS-2000BB lack the external voltage control that the S8M and earlier revisions have.
The external voltage control pins(A1 and A2) were left disconnected for some reason in these later revisions.
This internal modification will reconnect the voltage control pins for the S9M and higher revisions and allow for adjustment up to 14.6v.
A rev S8M daughterboard will also work in a rev S9M PS.
Only the 2nd connection highlighted in red needs to be made to the main board.
I did it this way to retain the ability to remove the daughterboard.
An alternative method is to run a jumper wire from the top of the daughterboard to the bottom of the mainboard to connect the same points.
Please use caution when performing this modification !!
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This is the area where we need to make the missing bridge connection on the S9 and later rev boards.
Only the 2nd (red) connection needs to be made to the main board to allow the external voltage control for rev S9 and higher.
Bottom view with the same missing pins. Only the 2nd (red) connection needs to be made. We have to make our own bridge wire to the mainboard.
Cut the ends off of a resistor to get two pieces of wire. I used what was available. If you have a single piece of heavy wire that is long enough then you can omit a good portion of this procedure.
Slowly spread the 2 bridge connector packs away from one another as shown. Solder one piece of resistor wire into the daughterboard. Run the other piece through the black plastic holder as shown here.
Before you solder, bend the top wire over a bit to help keep it in place. Then solder them together.
Bend the top wire piece back in place to match the other connectors. Then slowly press the 2 bridge connector packs back in place. Carefully reconnect the daughterboard to the mainboard and make sure that all pins match up.
Last edited by xandrios; Nov 17, 2011 at