3Com 5012 Installation Guide - Page 64

Displays Illegible Characters After POST, Troubleshooting of SDRAM, Nothing Displays After POST - manual

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64 CHAPTER 7: TROUBLESHOOTING Displays Illegible Fault: Characters After POST 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 SDRAM Nothing Displays After POST 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 you are 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. Repeated Reboots 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". You can decide whether the SDRAM has fault by checking the LED status of the router. During the router's POST, the SLOT1 to 3 LEDs and SERIAL0 LED will be ON first. In this case, if the SLOT1 and SLOT2 LEDs light, it can be concluded that the SDRAM test has failed. If the SDRAM is damaged, replace it with a new one (before opening the chassis, please contact the agent of 3Com Corporation Co, Ltd. and get his permission to continue with the operation). For the operation method, please refer to Section 6.2 "Maintain the Hardware" in this manual.

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64
C
HAPTER
7: T
ROUBLESHOOTING
Displays Illegible
Characters After
POST
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
SDRAM
Nothing Displays
After POST
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 you are 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.
Repeated Reboots
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”.
You can decide whether the SDRAM has fault by checking the LED status of the router.
During the router’s POST, the SLOT1 to 3 LEDs and SERIAL0 LED will be ON first. In this
case, if the SLOT1 and SLOT2 LEDs light, it can be concluded that the SDRAM test has
failed.
If the SDRAM is damaged, replace it with a new one (before opening the chassis, please
contact the agent of 3Com Corporation Co, Ltd. and get his permission to continue with
the operation). For the operation method, please refer to Section 6.2 “Maintain the
Hardware” in this manual.