
128 Chapter 10
Troubleshooting XMU+ Installation
To check for XMU
+
power supply failures - Small Chassis
1. Ensure that the Front Panel display is active (lit-up).
If the Front Panel display is active, proceed to the next troubleshooting task
- To verify AC/DC power circuits are functional.
If the Front Panel display is not active, remove the Power Supply card, and
reinstall it to ensure proper seating. See To remove a single Power Supply
card on page 114.
2. If the LED indicator is still not green, return the XMU+ to the factory to have
the Power Supply card replaced with a new one.
To check for XMU
+
power supply failures - Large Chassis
1. Ensure that the Front Panel display is active (lit-up).
If the Front Panel display is active, proceed to the next troubleshooting task
- To verify AC/DC power circuits are functional.
If the Front Panel display is not active, proceed to Step 2.
2. Ensure that the Power Supply card LED indicator is green.
3. If the LED indicator is green, proceed to the next troubleshooting task - To
verify AC/DC power circuits are functional.
4. If the LED indicator is not green, remove the Power Supply card, and reinstall it
to ensure proper seating. See Replacing the XMU+ Large Chassis Power Supply
on page 114.
5. If the LED indicator is still not green, replace the Power Supply card with a new
one.
See Replacing the XMU+ Large Chassis Power Supply on page 114.
To verify AC/DC power circuits are functional
1. Ensure that the appropriate power supply (AC or DC) is in operation.
2. If the appropriate power supply is not in operation, contact the appropriate
repair/maintenance department at the power company.
3. If the appropriate power supply is in operation, ensure that the unit is properly
plugged into its power supply. See “Connecting the XMU+ to its Power Supply”
in Chapter 2 of the XMU+ Installation Handbook.
4. If the unit is properly plugged into its power supply, proceed to the next
troubleshooting task - To verify line card operation and wiring.
To verify line card operation and wiring
Complete this troubleshooting step for each line card, excluding T1 line cards.
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