IBM 8685 Hardware Maintenance Manual - Page 43

LEDs for Active PCI slots Each Active (hot-plug) PCI slot has two LEDs associated with it: one Power-on LED and one Attention LED. The illustration in "System-board LED locations" on page 49 shows the location of these LEDs. Power-on LED This LED is on when the hot-plug PCI slot has power. An adapter must not be added to or removed from the PCI slot when the Power-on LED is on. When this LED is off, the hot-plug PCI slot has no power applied. An adapter can be added to or removed from the PCI slot when the Power-on LED is off. See your operating-system documentation to determine if your operating system supports hot-plug PCI adapters and, if so, how to disable the hot-plug PCI slot. Attention LED Each hot-plug PCI slot has an Attention LED that can be seen from inside the server. An Attention LED flashes approximately once per second when it is on. The meaning of the Attention LED is defined by your operating system. See your operating-system documentation to determine if your operating system supports hot-plug PCI adapters and, if so, what the Attention LED indicates. The following table describes the Power-on and Attention LEDs. Power-on LED On Attention LED Flashing On Off Off Flashing Off Off Description and action The adapter requires attention. The slot still has power applied. Do not remove or install an adapter in the slot. See your operating-system documentation for instructions. Normal operation; no intervention is required. The adapter requires intervention. Power is removed from the slot. An adapter can be removed or installed in the slot. Power is removed from the slot. An adapter can be removed or installed in the slot. Power-supply LEDs The ac and dc power LEDs on the power supply provide status information about the power supply. The following illustration shows the location of the ac and dc power LEDs. Chapter 3. Diagnostics 33