Appendix A Troubleshooting
Troubleshooting the Power Supplies
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Troubleshooting the Power Supplies
To isolate a power supply problem, follow these steps:
Step 1 Verify that the Input Ok LED on the power supply is green.
a.If the Input Ok LED is green, the AC source is good and the power supply is functional.
b.If the Input Ok LED is off, first ensure that the power supply is flush with the back of the chassis. Press the power switch off (0), tighten the captive installation screw(s), and then press the power switch on ().
c.If the Input Ok LED remains off, there might be a problem with the AC source, or the power cable.
d.Turn off the power to the switch by pressing both power switches to 0, connect the power cord to another power source if one is available, and press the power switch back on ().
e.If the Input Ok LED is now green, the problem was the first power source.
f.If the Input Ok LED fails to light after you connect the power supply to a new power source, replace the power cord and press the switch on ().
g.If the Input Ok LED lights at this point, return the first power cord for replacement.
If the Input Ok LED still fails to light when the switch is connected to a different power source with a new power cord, the power supply is probably faulty.
If a second power supply is available, install it in the second power supply bay and contact your customer service representative for further instructions.
Step 2 Repeat Step 1 if you have a second (redundant) power supply.
If you are unable to resolve the problem or if you determine that either a power supply or backplane connector is faulty, contact your customer service representative (see the “Contacting Customer Service” section on page
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