System Pulse Leds - IBM System x3550 M5 Type 5463 Installation And Service Manual

AC power-supply LEDs
AC DC Error (!)
On Off
On Off
On On /
Blinking
Note: When the DC LED is blinking at a 1Hz rate, the PSU is at STANDBY mode,
i.e. no DC power output from this PSU.

System pulse LEDs

Use this information to diagnose possible errors that are indicated by the system
pulse LEDs.
The following LEDs are on the system board and help you to monitor the system
power-on and power-off sequencing and boot progress (see "System-board LEDs"
on page 30 for the location of these LEDs).
Table 4. System pulse LEDs
LED
FPGA heartbeat
Description
Off Power-supply not
fully seated, faulty
system board, or
the power supply
has failed.
On The power supply
has failed.
On The power supply
has failed.
Description
Power-on and power-off
sequencing.
Action
1. Reseat the power supply.
2. Use the IBM Power
Configurator utility to ensure
current system power
consumption is under
limitation. For more
information and to download
the utility, go to
http://www-03.ibm.com/
systems/bladecenter/
resources/powerconfig.html.
Replace the power supply.
Replace the power supply.
Action
1. If the LED blinks at 1Hz, it is functioning
properly and no action is necessary.
2. If the LED is not blinking, (trained
technician only) replace the system board.
Notes
Typically indicates a
power-supply is not
fully seated.
Chapter 3. Troubleshooting
71