User Service Guide, Fifth Edition - HP Integrity rx8640 SEU

Table 4-9 PCI-X Power Converter Troubleshooting
ActionSymptom
A green LED will be illuminated to indicate that all DC output
rails are operating within specification. The Power Good LED
indicates the status of the PWR_OK signals.
Common power failure indications: Power Good
LED not on. Power Fault LED is on.
Backplane Power
Power to the system backplane is provided throught the power distribution module located in
the bottom of the server chassis. Power is routed to the system backplane from the distribution
module through wires and cables connected to the backplane at various locations.
The system backplane also contains VRM’s to condition and control power delivered to the cell
boards inserted into the server.
Figure 4-13 Backplane Power
Table 4-10 System Backplane Troubleshooting
ActionSymptom
Visual inspections for LED indications on the system backplane
and the use of the "ps" command should pinpoint the failing
FRU. The entire system backplane assembly is a FRU.
Common power failure indications: Power “good”
LED may not be lighted. Error log indicates a
power error - read the log using the MP.
Cooling Subsystem Failures
The rx8640 Server has the following cooling features.
9 front intake fans
12 rear exhaust fans
6 PCI-X cooling fans
Up to 6 power supply fans. Each power supply has its own fan.
There are points for temperature monitoring:1. Inlet air2. BPS - overtemperature
90 Troubleshooting