Table 11. Power-supply LEDs (continued)
AC Power-supply LEDs
Description Action NotesAC DC Error
On Off or
Flashing
On Faulty power
supply
Replace the power supply.
On On Off Normal
operation
On On On Power supply is
faulty but still
operational
Replace the power supply.
System pulse LEDs
This section describes the system pulse LEDs on the system board that monitors
the system power-on and power-off and boot progress.
The following LEDs are on the system board and monitor the system power-on
and power-off sequencing and boot progress (see “System-board LEDs” on page 34
for the location of these LEDs).
Table 12. System pulse LEDs
LED Description Action
RTMM heartbeat Power-on and power-off
sequencing.
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.
IMM2 heartbeat IMM2 heartbeat boot process. 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.
132 System x3100 M5 Type 5457: Installation and Service Guide
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