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Installation ManualQuidway AR 28 Series RoutersChapter 7 TroubleshootingChapter 7 Troubleshooting7.1 Troubleshooting of the Power System1) FaultPOWER LED is OFF.2) TroubleshootingPlease check:• Whether the power switch of the router is turned on.• Whether the power supply switch is turned on.• Whether the power cord of the router is properly connected.• Whether the power supply matches the requirement of the router.Caution:Do not hot swap the power cord. After having checked the items above, if the POWER LED is still OFF,please contact the agent.7.2 Troubleshooting of the Configuration SystemAfter the Power-On Self-Test (POST) of the router, if the system operates normally, thestart-up information should be displayed on the console terminal. If the configurationsystem has some faults, the terminal may not display anything or may display onlyillegible characters.I. Troubleshooting of “nothing being displayed on the terminal”1) FaultAfter the POST of the router, the terminal does not display any information.2) TroubleshootingStep 1: please check:• Whether the power system is normal.• Whether the console cable is connected correctly.7-1
Installation ManualQuidway AR 28 Series RoutersChapter 7 TroubleshootingStep 2: If no problems are found after performing the above checks, it is likely to be theproblem of the console cable or the terminal (e.g., the HyperTerminal) parameters.Please check the cable or the parameters.II. Troubleshooting of “displaying illegible characters on the terminal”1) FaultAfter the POST of the router, the console terminal displays illegible characters.2) TroubleshootingPlease verify whether the terminal (e.g., the HyperTerminal) parameter settings are asfollows: Baud rate: 9600, Data bits: 8, Stop bit: 1, Parity: None, Flow control: None andTerminal emulation: VT100 If the parameter settings differ from the above values,please reconfigure.7.3 Troubleshooting of SDRAMI. Troubleshooting of “nothing being displayed on the terminal”1) FaultAfter the POST of the router, despite the normal power system (the POWER LED is ON)and proper connection of the console cable, there is no display on the console terminal.2) TroubleshootingIf the user is sure that the power system and configuration system have no faults,please contact the agent of Huawei Technologies Co., Ltd. With his consent, open thechassis to check whether the SDRAM has become loose. If that is the case, you mayremove and reinstall the SDRAM. For the operation method, please refer to Section 6.2“Maintaining the Hardware” in this manual.II. Troubleshooting of repeated reboot1) FaultFault 1: After the information “Now testing memory...” appears, the system restartsrepeatedly.Fault 2: After displaying the information “System now is Starting ...”, the system restartsrepeatedly, and sometimes gives a prompt message “Copied program error”.2) TroubleshootingGenerally, such faults are caused by the damage to SDRAM. If the SDRAM is seriouslydamaged, the problem will be found while testing the memory, and the system willreboot. If the SDRAM is slightly damaged, the problem will be found during the processof system starting, and the system will reboot, giving the prompt message “Copiedprogram error”.7-2
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