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INSTALLATION GUIDE Installationsanleitung - SMC

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Appendix A: Troubleshooting<br />

Diagnosing Switch Indicators<br />

Symptom<br />

Table A-1 Troubleshooting Chart<br />

Action<br />

Power LED is Off • Check connections between the switch, the power cord, and the wall<br />

outlet.<br />

• Contact your dealer for assistance.<br />

• Contact our Technical Support.<br />

Link LED is Off • Verify that the switch and attached device are powered on.<br />

• Be sure the cable is plugged into both the switch and corresponding<br />

device.<br />

• If the switch is installed in a rack, check the connections to the<br />

punch-down block and patch panel.<br />

• Verify that the proper cable type is used and its length does not exceed<br />

specified limits.<br />

• Check the adapter on the attached device and cable connections for<br />

possible defects. Replace the defective adapter or cable if necessary.<br />

Power and Cooling Problems<br />

If the power indicator does not turn on when the power cord is plugged in, you may<br />

have a problem with the power outlet, power cord, or internal power supply.<br />

However, if the unit powers off after running for a while, check for loose power<br />

connections, power losses or surges at the power outlet. If you still cannot isolate<br />

the problem, then the internal power supply may be defective.<br />

A-1

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