PC Server 500 (Type 86XX) Power Supplies

   The Type 86XX computers are shipped with a 434W primary power supply. An additional or optional 220W power supply can be added to the computer. This "optional" power supply MUST be installed if you are going to put a second RAID bacplane and drives in! Connectors are used to transfer the primary power supply voltages and signals from the primary power supply to the optional power supply. 



Connecting the 220W Power Supply

Unplug the power cord!!! 

   Remove the primary power supply cover plate retaining screw. Push the cover plate inwards until it stops (about 3/8 of an inch). Pull up on the edge now overhanging the side of the power supply. Note the tab and slot locking arrangement.

   Pull the ACO connector out of the power supply. It won't come out very far, just enough for the plug body to clear the PS case. DO NOT attempt to pull the ACO connector cable out farther! The connector cable is short and it's tied to the power supply frame as well. Connect the ACO connector from the 220W power supply. Push both connectors back into the recess of the primary power supply.



Signal Cable
 From the 500 Man
The signal cable from the 220W PSU plugs onto the four pin header on the side near the front of the primary 434W PSU. I imagine thats what turns on the 220W PSU.

  In short, plug the signal cable onto the four pin header in the main PSU.

   Slide the 220W power supply onto the locking tabs. Slide it towards the rear of the system until it stops. Fasten the 220W PS to the main PS with the two screws through the mounting tabs on the 220W power supply. 



Re-Installing the primary power supply cover plate
 Caution


    When replacing the primary power supply cover plate, rotate the plate 180. This will leave an opening for the primary power supply connector cable that connects to the optional power supply.  Failure to do so will cause the power supply connector cable to be crimped when the plate is replaced. 

Rotate the cover plate so the downward part enters the recess first. Ensure that the locking tabs are in the slots. Push the cover forward until the cover plate mounting screw can be inserted. Fasten the cover down with a screw. 

  When you rotate the cover, you may not be able to slide it far enough for the mounting screw hole in the plate to match up with the tapped hole in the power supply. Take a file and remove enough of the metal from the downward length on the side towards the exhaust end of the power supply. It is marked "X" in the illustration. You don't need to remove much.



Main PS and Additional PS


220W Power Supply Unmasked!


Primary Power Supply Voltages
If the voltages are correct, and the power supply fan runs, the power supply is OK.
    _________________ __________________ _________________ _________________  
   | -Lead Pin       | +Lead Pin        | V dc Minimum    | V dc Maximum    | 
   |_________________|__________________|_________________|_________________| 
   |     5           |     3            | +3.7            | + 6.2           | 
   |     5           |     4            | +9.0            | +15.0           | 
   |     5           |     7            | -9.0            | -15.0           | 
   |     B           |     D            | +3.7            | + 6.2           | 
   |     B           |     A            | +9.0            | +15.0           | 
   |_________________|__________________|_________________|_________________|

Fan Assembly Power Connectors P11, P12, and P13 
  PICTURE 45
_________________ __________________ _________________ _________________  
| -Lead Pin       | +Lead Pin        | V dc Minimum    | V dc Maximum    | 
|_________________|__________________|_________________|_________________| 
|     2           |     1            | +11.5           | +12.6           | 
|_________________|__________________|_________________|_________________|

Optional Power Supply Drive Connector Voltages
If the voltages are correct, and the power supply fan runs, the power supply is OK.
 _________________ __________________ _________________ _________________  
| -Lead Pin       | +Lead Pin        | V dc Minimum    | V dc Maximum    | 
|_________________|__________________|_________________|_________________| 
|     B           |     D            | + 3.7           | + 6.2           | 
|     B           |     A            | + 9.0           | +15.0           | 
|_________________|__________________|_________________|_________________|
If the power supply shuts down, or appears to fail at power-on, you might have one of the following problems:
  • Too many devices are set to start instantly. See "Setting the Motor-Start Jumper" in topic 2.8.6.
  • There are too many large-capacity devices installed. The nominal operating current of the devices installed collectively exceeds the available current of the power supply. See the "Personal System/2 Installation Planning" guide (form number G41G-2927) for more information.
    ___ Caution ____________________________________________________________  
   |                                                                        | 
   | Unplug the power cord and wait two minutes before checking voltages to | 
   | give the power supply capacitors time to discharge.                    | 
   |                                                                        | 
   |________________________________________________________________________|
Copyright IBM Corp. 1995

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