System Pulse Leds - Lenovo System x3550 M4 Installation And Service Manual

DC power-supply LEDs
IN OK OUT OK
On Off
On On

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 29 for the location of these LEDs).
Table 15. System pulse LEDs
LED
RTMM heartbeat
IMM heartbeat
PCI riser-card LEDs
Use this information to view PCI riser-card LEDs.
The following illustration shows the location of the PCI riser-card LEDs.
132
System x3550 M4 Installation and Service Guide
Error (!) Description
On The power supply
has failed.
On The power supply
has failed.
Description
Power-on and power-off
sequencing.
IMM2 heartbeat boot process.
Action
page 148 and "Solving power
problems" on page 156 until
the problem is solved.
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.
The following steps describe the different stages
of the IMM2 heartbeat sequencing process.
1. When this LED is blinking fast
(approximately 4Hz), this indicates,
that the IMM2 code is in the loading
process.
2. When this LED goes off momentarily, this
indicates that the IMM2 code has loaded
completely.
3. When this LED goes off momentarily and
then starts blinking slowing (approximately
1Hz), this indicates that IMM2 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.
Notes