System Pulse Leds - Lenovo System x3250 M5 Installation And Service Manual

Table 13. Power-supply LEDs
AC Power-supply LEDs
AC DC Error
On On Off
Off Off Off
On Off Off
On Off or On
Flashing
On On On

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 29 for the location of these LEDs).
Table 14. System pulse LEDs
LED
RTMM heartbeat
IMM2 heartbeat
Description Action
Normal
operation
No ac power 1. Check the ac power to the server.
to the server or
2. Make sure that the power cord is
a problem with
connected to a functioning power
the ac power
source.
source.
3. Restart the server. If the error remains,
check the power-supply LEDs.
4. If the problem remains, replace the
power-supply.
Faulty system
1. Turn off the server and disconnect
board or faulty the power cord from the server; then,
power supply reconnect the power cord.
2. If the system board error (fault) LED is
not lit, replace the power supply.
3. (Trained technician only) If the system
board error LED is lit, replace the
system board.
Faulty power Replace the power supply.
supply
Power supply Replace the power supply.
is faulty but still
operational
Description
Power-on and power-off
sequencing.
IMM2 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 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.
Chapter 4
Notes
This is a normal
condition when no
ac power is present.
Typically indicates
that a power supply
is not fully seated.
This is a normal
condition before
turning on the
system.
121
.
Troubleshooting