Lenovo NeXtScale n1200, Installation And Service Manual

Page: 75 / 878

AC power-supply LEDs
Description
Action Notes AC DC
Error (!)
Off On On The power supply
has failed. Replace the power supply.
On Off Off Power-supply not
fully seated, faulty
system board, or
the power supply
has failed.
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.
Typically indicates a
power-supply is not
fully seated.
On Off On The power supply
has failed. Replace the power supply.
On On On The power supply
has failed.
Replace the power supply.
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
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.
Chapter 4
.
Troubleshooting
61