System Pulse Leds - IBM System x3550 M3 Type 4254 Installation And User Manual

System pulse LEDs

The following LEDs are on the system board and monitors the system power-on
and power-off sequencing and boot progress.
See "System-board LEDs" on page 41 for the location of these LEDs.
Table 5. System pulse LEDs
LED
Enclosure management heartbeat
IMM heartbeat
32
IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide
Description
Power-on and power-off sequencing.
IMM heartbeat boot process.
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 service technician only)
replace the system board.
The following steps describe the
different stages of the IMM heartbeat
sequencing process.
1. When this LED is blinking fast
(approximately 4Hz), this
indicates, that the IMM code is in
the loading process.
2. When this LED goes off
momentarily, this indicates that
the IMM code has loaded
completely.
3. When this LED goes off
momentarily and then starts
blinking slowing (approximately
1Hz), this indicates that IMM 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, complete the
following steps:
a. (Trained service technician
only) use the IMM recovery
jumper to recover the
firmware (see "System-board
switches and jumpers" on
page 38).
b. (Trained service technician
only) replace the system
board.