System Pulse Leds - Lenovo NeXtScale nx360 M5 Installation And Service Manual

AC power-supply LEDs
Error (!)
AC DC
Off On
On Off
On Off
On On

System pulse LEDs

Use this information to view the system pulse LEDs.
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 27 for the location of these LEDs).
Table 3. System pulse LEDs
LED
RTMM heartbeat
IMM2 heartbeat
Description
On The power supply
has failed.
Off Power-supply not
fully seated, faulty
system board, or
the power supply
has failed.
On The power supply
has failed.
On The power supply
has failed.
Description
Power-on and power-off
sequencing.
IMM2 heartbeat boot process.
Action
Replace the power supply.
1. Reseat the power supply.
2. Follow actions in "Power
problems" on page 75.
3. Follow actions in "Solving
power problems" on page 79
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
Typically indicates a
power-supply is not
fully seated.
.
Chapter 4 Troubleshooting
61