Chapter 4 Troubleshooting the Installation
Problem Solving with Subsystems
4-26
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Step 7 If a spare power supply is available, replace the existing module with the spare. If
the DC LED then goes on, the power supply is working normally.
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 power cable is faulty, contact a service representative for assistance.
Troubleshooting the DC-Input Power Entry Module
Begin checking the DC-input PEM by first looking at the LEDs on the PEM
(see the “DC-Input Power Entry Module LEDs” section on page 4-19).
For a DC-input PEM to operate normally, the following conditions must be true:
• The PEM is fully seated in its bay and the ejector levers are secured.
• DC-input power within the required range is correctly connected to the
chassis PDU terminal connector blocks.
• The circuit breaker on the faceplate of the PEM is switched on.
• The green LEDs labeled OUTPUT OK and INPUT OK on the PEM faceplate
are on, and the yellow LED labeled MISWIRE is off.
To help isolate a problem with a DC-input PEM, follow these steps:
Step 1 Is the MISWIRE LED on?
• If Yes, the source DC positive and negative cable leads are connected in
reverse order to the terminal connector block on the PDU.
• If No, go to Step 2.
Step 2 If the INPUT OK LED is off, verify that the PEM is fully seated in its bay, the
ejector levers are flush with the PEM faceplate, and the captive screws are
secured.
• If the INPUT OK LED goes on, go to Step 6.
• If the INPUT OK LED remains off, go to Step 3.
Step 3 Verify that the PEM circuit breaker switch is on.
• If No, switch it on. If the INPUT OK LED goes on, go to Step 6.