IBM pSeries 670 Service Manual page 169

Step 1521-4
Independent faults are indicated on both sides of the BPA. Each side must be isolated separately. Call for
support. This ends the procedure.
Step 1521-5
Check the External (Room) EPO Connection if used.
If a room emergency power off (EPO) circuit is used, the external room EPO circuit is connected to the
J02 connector on the lower edge of the UEPO Switch.
Is a cable connected into the connector J02 on the UEPO Switch?
NO Go to "Step 1521-6".
YES Go to "Step 1521-7".
Step 1521-6
Is the internal toggle switch on the EPO panel card set to the 'RM EPO BYPASS' position?
Set the internal toggle switch to the 'RM EPO BYPASS' position, and go to "MAP 0410: Repair
NO
Checkout" in the RS/6000 and Eserver pSeries Diagnostic Information for Multiple Bus Systems.
YES Exchange the UEPO card assembly. Follow all the steps in the removal and replacement
procedure for the "Unit Emergency Power Off (UEPO) Card Assembly" on page 788. Go to "Step
1521-8" on page 150.
Step 1521-7
Note: Read the Danger and Caution notices under "Safety Notices" on page xi before continuing with this
procedure.
Disconnect the cable from UEPO connector J02, and set the toggle switch to the 'RM EPO BYPASS'
position.
Does the UEPO CMPLT LED on at least one BPC become lit?
NO Exchange the UEPO card assembly. Follow all the steps in the removal and replacement
procedure for the "Unit Emergency Power Off (UEPO) Card Assembly" on page 788. Go to "Step
1521-8" on page 150.
YES Notify the customer that the room EPO circuit is defective at this connection and requires service.
This ends the procedure.
Chapter 3. Maintenance Analysis Procedures
149