Cisco Systems Cisco 12006, Cisco 12406 manual OL-11497-03

Chapter 4 Troubleshooting the Installation

Problem Solving with Subsystems

•If Yes, go to Step 4.

Step 4 Turn off the PEM circuit breaker switch and check the DC power source:

a.Check the DC power wires from the power source to the router.

•Verify that the power wires are fastened securely at the PDU and the DC source.

•Verify that the power wires are not worn or damaged. If the insulation appears cracked or broken, have the power wires replaced.

b.Verify that the DC power source circuit breaker is on, and that the circuit breaker has the proper current rating.

c.Verify that each PEM in the router is attached to a separate DC power source.

•If the DC power source wiring appears to be okay, and the PEM INPUT OK LED goes on when you switch on the PEM, go to Step 6.

•If the DC power source wiring appears to be okay, but the power supply INPUT OK LED remains off when you switch on the PEM, go to Step 5.

Step 5 Remove the PEM and insert it in the second bay in the router, or into a bay on another Cisco 12006 or Cisco 12406 Router.

•If the INPUT OK LED remains off, the PEM is faulty and must be replaced.

•If the INPUT OK LED goes on, the input portion of the PEM is working normally, go to Step 6.

Step 6 Is the OUTPUT OK LED on?

•If Yes, the power source is good and the PEM is operating normally. This is the end of the procedure.

Note In a Cisco 12006 or Cisco 12406 Router with two PEMs, the output power from the second PEM is adequate to maintain router operation, so the following check conditions only apply in a router with one PEM—or in a case where the second PEM is temporarily disabled by switching it off.

•If No, and there is no other system activity (blower module is off; line cards are unpowered), the PEM is faulty and must be replaced. Go to Step 7.

•If No, but the blower module is operating, suspect a faulty OUTPUT OK LED. If the blower module is operating, all internal DC voltages are within tolerance. Use the show environment command to check the voltages on each card. The blower module uses –48 VDC.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03		4-27