Flashing slowly (once per second): The server is turned off and is ready to be turned on. You can press
the power-control button to turn on the server.
Lit: The server is turned on.
2 FPGA heartbeat LED (green)
This LED indicates power-on and power-off sequencing.
• LED blinking: the system is functioning properly, and no action is necessary.
• LED not blinking: (trained technician only) replace the system board. See “System board replacement
(trained technician only)” on page 192.
3 XCC heartbeat LED (green)
This LED indicates XCC heartbeat and boot process:
• LED blinking fast: XCC code is in the loading process.
• LED going off momentarily: XCC code has loaded completely.
• LED going off momentarily and then starts blinking slowing: XCC is fully operational. You can now
press the power-control button to power on the server.
System board switches
Use this information to locate the system board switches.
Important:
• Read “Installation guidelines” on page 57 to ensure that you work safely.
• Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-
sensitive components in their static-protective packages until installation, and handling these devices with
an electrostatic-discharge wrist strap or other grounding system.
• Turn off the server before you move the switches; then, disconnect all power cords and external cables.
Do not open your server or attempt any repair before reading and understanding the following information:
• Any system board switch that is not shown in the illustrations in this document are reserved.
Note: If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to
access the switches.
36
ThinkSystem ST650 V2 Maintenance Manual
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