System-Board Leds - IBM x3630 M3 7377 Problem Determination And Service Manual

System-board LEDs

The following illustration shows the light-emitting diodes (LEDs) on the system
board.
Note: Error LEDs remain lit only while the server is connected to power. If you
disconnect power to the server, you can press and hold the light path diagnostics
button to light the error LEDs on the system board.
20
IBM System x3630 M3 Type 7377: Problem Determination and Service Guide
LED name
Error LEDs
H8 heartbeat
IMM heartbeat
Microprocessor
mismatch
Standby power
Description
When an error LED is lit, it indicates that the associated
component has failed.
When this LED is flashing, it indicates that the power
management controller is functioning normally.
When this LED is flashing at a constant rate of every other
second, it indicates normal operation of the IMM controller. When
this LED is flashing at a constant rate of every other half-second,
it indicates that the IMM controller is initializing or is not
functional.
When this LED is lit, it indicates that microprocessor 1 is not
installed, or the microprocessors do not have the same cache
size and type, and clock speed.
When this LED is lit, it indicates that the server is connected to
an ac power source and that the power supply has supplied the
5–volt standby voltage to the system board.