Cisco Systems manual Cisco XR 12404 Router Installation Guide

Chapter 4 Troubleshooting the Installation

Troubleshooting the Processor Subsystem

Check the following to help isolate a problem with the RP.

•Are both alphanumeric LED displays on?

–The two displays are powered separately. The left display receives power from the DC-DC converter on the RP. The right display is powered directly from the power supply; therefore, even if the RP has not powered up, its right display could be on. If both displays are off, the RP may not be properly seated in the backplane connector, there might be a problem with the MBus module on the RP, or the system power supply might be off.

•If both displays are on, check the message being displayed. As soon as the DC-DC converter is turned on by the MBus module, the processor on the RP begins the boot process. Status messages are displayed as the boot process continues. If one of the messages appears frozen, the boot process could be halted. Write the message being displayed on a piece of paper. Turn off the PEM power switches, then turn them back on to reset the system and start the boot process again. If the system halts again, the RP could be faulty and may need to be replaced.

–If the PEMs and fans appear operational but none of the RP LEDs or displays are on, suspect that the RP has not been properly installed or that the +5 VDC output from the CSF card is faulty.

–Turn the PEM power switch to the OFF position on each PEM.

–Loosen the two captive screws on the left and right sides of the

RP faceplate, and use the ejector levers to eject and reseat the RP. Tighten the captive screws, then power on the system by turning the PEM power switches on.

•Is a Critical, Major, or Minor alarm LED on the CSF card on?

–If any of the three CSF card LEDs is on, a fault has been detected in the system. Check the console for messages indicating the source of the problem.

–There could be a false error indication originating from the RP. You may want to reseat or replace the RP.

Caution The RP reset switch resets the RP and the entire system. To prevent system errors and problems, use it only at the direction of a Cisco-certified service representative.

	Cisco XR 12404 Router Installation Guide
4-18	OL-13830-02