3Com Router 6000 FamilyInstallation ManualChapter 7Troubleshooting3Com Corporation7-1Chapter 7 Troubleshooting7.1 Troubleshooting the Power SystemSymptom:The RUN LED on the PSU is OFF or blinking.Solution:Check that:z The power switch on the router is turned on.z The switch of the power source is turned on.z The power cord is correctly connected.z The power source meets the requirement of the router. If the PSU is DC-input,check the AC/DC OK LED: solid ON means the input voltage is normal (85 to 264V), off means the input voltage is abnormal.7.2 Troubleshooting the Configuration SystemIf the router passes POST after powered up, the console screen displays the startupbanner; if faults occur to the configuration system, the console screen displays nothingor only illegible characters.Symptom 1:After the router is powered on, the console screen displays nothing.Solution:Step 1: Check that:z The power system is normal.z The console cable is correctly connected.Step 2: Check the console cable and the terminal (HyperTerminal for example)settings.Symptom 2:After the router is powered on, the console screen displays illegible characters.Solution:Verify that the terminal settings are as follows:Baud: 9600
