52Chapter 4: Troubleshooting
Troubleshooting of “displaying illegible characters on the terminal”
Fault: After the POST of the router, the console terminal displays illegible characters.
Troubleshooting: Verify whether the terminal (e.g., the
HyperTerminal) parameter settings are as follows: Baud rate: 9600, Data
bits: 8, Stop bit: 1, Parity: None, Flow control: None and Terminal
emulation: VT100 If the parameter settings differ from the above values, please reconfigure.
Troubleshooting of Troubleshooting of “nothing being displayed on the terminal”
SDRAM
Fault: After 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.
Troubleshooting: If the user is sure that the power system and configuration system have no faults, please contact the agent of 3Com Corporation Co., Ltd. With his consent, open the chassis to check whether the SDRAM has become loose. If that is the case, you may remove and reinstall the SDRAM. For the operation method, please refer to Section 6.2 “Hardware Maintenance” in this manual.
Troubleshooting of repeated reboot
Fault 1: After the information “Now testing memory...” appears, the system restarts repeatedly.
Fault 2: After displaying the information “System now is Starting ...”, the system restarts repeatedly, and sometimes gives a prompt message “Copied program error”.
Troubleshooting: Generally, such faults are caused by the damage to SDRAM. If the SDRAM is seriously damaged, the problem will be found while testing the memory, and the system will reboot. If the SDRAM is slightly damaged, the problem will be found during the process of system starting, and the system will reboot, giving the prompt message “Copied program error”.
