Table of Contents

Chapter 8 Troubleshooting. 8-1

8.1 Troubleshooting the Configuration System.. 8-1

8.1.1 No Display on the Terminal 8-1

8.1.2 Illegible Characters on the Terminal 8-2

8.2 Troubleshooting the Power Supply. 8-2

8.3 Troubleshooting the Fan Tray. 8-2

8.4 Troubleshooting SRPUs and LPUs. 8-3

 

Chapter 8  Troubleshooting

Although the S7500 series have passed the comprehensive and strict test before delivery, faults may occur due to improper installation. This chapter describes how to handle the faults caused by improper installation.

On the SRPU of the S7500 series, you can find the status LEDs of the LPUs, power modules, and fan tray. You can check these status LEDs to locate the faults.

 

 

8.1  Troubleshooting the Configuration System

If the configuration system is normal after it is powered on, the startup banner will be displayed on the configuration terminal. If the configuration system is faulty, the configuration terminal may display illegible characters or nothing at all.

8.1.1  No Display on the Terminal

If no information is displayed on the terminal after the switch is powered on, check whether:

l           The power system works normally.

l           The SRPU works normally.

l           The console cable is connected to the console port in the SRPU.

If no problem is found after the above checks, check whether:

l           The console cable is connected to a wrong serial port. (The port in use is not the one set on the terminal.)

l           The terminal parameters are configured incorrectly.

These parameters should be configured as follows:

–Bits per second: 9600

–Data bits: 8

–Parity check: None

–Stop bits: 1

–Flow control: None

–Terminal emulation mode: VT100

l           Something is wrong with the console cable.

8.1.2  Illegible Characters on the Terminal

If the configuration terminal displays illegible characters, it is very likely that the terminal parameters are incorrect. In this case, check them according to the correct configuration listed in section 8.1.1  “No Display on the Terminal” on page 8-1.

8.2  Troubleshooting the Power Supply

Table 8-1 Description of power LEDs

LED	Status	Description
OK (Green)	ON	The power module works normally.
	OFF	The power module is faulty or is not installed.
FAIL (Red)	ON	The power module is faulty.
	OFF	The power module works normal or is not installed.

 

 

If the OK LED is off, something is wrong with the system power supply. Check whether:

l           The power switch is turned on.

l           The power cable(s) is properly connected.

l           The voltage is correct.

8.3  Troubleshooting the Fan Tray

Table 8-2 Description of fan tray LEDs

LED	Status		Description
OK (Green)	ON	The fan tray works normally.
	OFF	The fan tray is faulty or is not installed yet.
FAIL (Red)	ON	The fan tray is faulty or is not installed yet.
	OFF	The fan tray works normally.

 

If the OK LED is off, check whether:

l           Each fan works normally.

l           Something blocks the vents of the chassis.

l           A blank panel is installed in the slot without a board.

8.4  Troubleshooting SRPUs and LPUs

The SRPG LEDs and LPUx (x ranges from 1 to 6 for the S7506 and S7506R, and from 1 to 3 for the S7503) LEDs respectively show the status of the SRPU and LPU.

Table 8-3 Description of board LEDs

LED	Status		Description
RUN (Green)	ON/OFF	The board is faulty or is not installed yet.
	Blinking	The board works normally.
ALM (Red)	OFF	The board is faulty or is not installed yet.
	ON	The board works abnormally.

 

l           If the ALM LED of a board is solid on, something is wrong with the board. When you reset a board, the ALM LED will be on, but will be off after it is started to work normally.

l           When you reset a board, if the ALM LED stays off, the board may be disconnected from the power supply. Check whether the board is properly installed.