System Pulse Leds - IBM 7383 Installation And Service Manual

Table 12. Power-supply LEDs (continued)
AC Power-supply LEDs
AC DC Error
Off On Off
Off On On
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 and
controls" on page 31 for the location of these LEDs).
Table 13. System pulse LEDs
LED
RTMM heartbeat
IMM2 heartbeat
Description Action
Faulty power Replace the power supply.
supply
Faulty power Replace the power supply.
supply
Power supply
1. Reseat the power supply.
not fully seated,
2. If the system board error LED is not
faulty system
lit, replace the power supply.
board, or faulty
3. (Trained technician only) If the system
power supply
board error LED is lit, replace the
system board.
Faulty power Replace the power supply.
supply
Power supply is Replace the power supply.
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.
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
Notes
Typically indicates
that a power supply
is not fully seated.
143