Lenovo System x3550 M5, Installation And Service Manual

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Table 5. System pulse LEDs
LED Description Action
FPGA heartbeat Power-on and power-off
sequencing 1. If the LED blinks at 1 Hz, it is functioning
properly and no action is necessary.
2. If the LED is not blinking, (trained technician
only) replace the system board.
IMM heartbeat IMM2.1 heartbeat boot process
The following steps describe the different stages
of the IMM2.1 heartbeat sequencing process.
1. When this LED is blinking fast
(approximately 4 Hz), this indicates
that the IMM2.1 code is in the loading
process.
2. When this LED goes off momentarily, this
indicates that the IMM2.1 code has loaded
completely.
3. When this LED goes off momentarily and
then starts blinking slowing (approximately
1 Hz), this indicates that IMM2.1 is fully
operational. You can now press the
power-control button to power on the
server.
4. If this LED does not blink within 30 seconds
of connecting a power source to the server,
(trained technician only) replace the system
board.
PCI riser-card LEDs
Use this information to view PCI riser-card LEDs.
Chapter 3
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Troubleshooting
63