Troubleshooting the Processor Subsystem

•In systems powered by source DC, check the cable connections to the terminal studs on the DC-input power supply faceplate to ensure that the correct polarity (+ and –) has been observed in making the connections.

•Is the power cord (AC) or the power cable (DC) from the power source to the router in good condition and not damaged? If insulation on the cord or the cable appears cracked or broken, or if the AC plug or the DC terminal lugs appear to be loose, do not use the item. Immediately replace it with a new AC power cord or a new DC power cable.

•If the AC INPUT OK LED (AC-input power supply) or the INPUT OK LED (DC-input power supply) still fails to go on after you connect the power supply to a new power source, swap the existing power cord or cable with a replacement unit.

•Turn the rotary power switch back ON. If the AC INPUT OK LED (AC-input power supply) or the INPUT OK LED (DC-input power supply) goes on, return the first power cable for replacement.

•If the AC INPUT OK LED (AC-input power supply) or the INPUT OK LED (DC-input power supply) still fails to go on when the router is connected to a different power source with a new power cable, the power supply itself is probably faulty.

•If a spare power supply is available, replace the existing power supply with the spare unit and restart the system. If the AC INPUT OK LED (AC-input power supply) or the INPUT OK LED (DC-input power supply) goes on, return the faulty power supply for replacement.

If you are unable to resolve the problem, or if you determine that either the power supply or the power cord (AC) or power cable (DC) is faulty, contact your Cisco service representative for assistance.