IBM System x iDataPlex dx360 M4 7912, Service Manual

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One PCI riser-card assembly in PCI riser connector 1
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on an AC power supply and suggested
actions to correct the detected problems.
AC power-supply LEDs
Description Action Notes AC DC Error (!)
On On Off Normal operation.
Off Off Off No ac power to the
server or a problem
with the ac power
source.
1. Check the ac power to the
server.
2. Make sure that the power
cord is connected to a
functioning power source.
3. Restart the server. If the error
remains, check the
power-supply LEDs.
4. If the problem remains,
replace the power-supply.
This is a normal
condition when no ac
power is present.
Off Off On The power supply
has failed. Replace the power supply.
Off On Off The power supply
has failed. Replace the power supply.
Off On On The power supply
has failed. Replace the power supply.
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
The following LEDs are on the system board and monitor the system power-on and
power-off sequencing and boot progress:
Table 4. 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 service
technician only) replace the system board.
Chapter 3. Diagnostics
189