Power Subsystems 
System Event Log Troubleshooting Guide for EPSD
 
Platforms Based on Intel
®
 Xeon
®
 Processor E5 4600/2600/2400/1600/1400 Product Families 
36  Intel order number G90620-002  Revision 1.1 
Soft Power Control 
Failure 
Generally means power good was lost in 
the system, causing a shutdown. 
This could be cause by the power supply subsystem or system 
components. 
1.  Verify all power cables and adapters are connected properly (AC 
cables as well as the cables between the PSU and system 
components). 
2.  Cross test the PSU if possible. 
3.  Replace the power subsystem. 
Power subsystem experienced a failure. 
Indicates a power supply failed. 
1.  Remove and reapply AC power. 
2.  If the power supply still fails, replace it. 
4.3.2  Power Unit Redundancy Sensor 
This sensor is enabled on the systems that support redundant power supplies. When a system has AC applied or if it loses 
redundancy of the power supplies, a message will get logged into the SEL. 
Table 17: Power Unit Redundancy Sensors Typical Characteristics 
Event Direction and 
Event Type 
[7] Event direction 
0b = Assertion Event 
1b = Deassertion Event 
[6:0] Event Type = 0Bh (Generic Discrete) 
[7:6] – 00b = Unspecified Event Data 2 
[5:4] – 00b = Unspecified Event Data 3 
[3:0] – Event Trigger Offset as described in Table 18