Replacing a Device

Context

When a fault occurs on the USG device, such as a memory fault, CPLD fault, or startup failure, you can replace the USG device to rectify the fault.

Precautions

Pay attention to the following during device replacement:

If a device can still be started, save and back up the configuration data before powering off the device. Otherwise, the configuration will be lost.
If a device with a hard disk can still be started, run the disk offline command in the system view. Wait for about 30 seconds. After the system displays a message indicating that the hard disk stops working, remove the hard disk unit to be replaced. Alternatively, hold down the OFL button for about 4 seconds until the OFL indicator turns on, and then remove the hard disk unit. Do not directly remove the power cable or disconnect the power supply to power off the USG device. Otherwise, data loss and hard disk damage may occur.
To prevent a USG device from falling down, hold the device tightly with both hands while removing or installing it.
Be careful of the heat when replacing the USG device.
In a hot standby scenario, ensure that the model and software version of the new USG device are the same as those of the standby USG device.

Preparing Tools

ESD wrist strap or ESD gloves
Phillips screwdriver

Replacing a device

Determine the installation position of the USG device to be replaced and attach a replacement label on the panel of the device to avoid misoperations.
Wear an ESD wrist strap or ESD gloves.
Disconnect the power supply device from the USG device to be replaced. When the PWR indicator on the USG device is off, you can proceed with subsequent operations.
Remove the cables from the USG device to be replaced and attach labels that specify interface numbers to the cables.

Remove the power cables, service cables, and ground cables from the USG device to be replaced in sequence.
Remove the USG device to be replaced.
For a device installed on a workbench, you only need to move the device away. For a device installed on a wall, use a Phillips screwdriver to loosen the M6 screws on the mounting ears at both ends of the device, and remove the device from the wall with both hands. For a device installed in a cabinet, perform the following steps to remove it:
1. Use a Phillips screwdriver to loosen the M6 screws on the mounting ears at both ends of the USG device.
2. Hold the USG device with both hands and pull it out along the guide rails of the rear mounting ears. Place the removed USG device in an ESD bag or on an ESD pad.
Figure 1 Removing a device from the cabinet
Install the new USG device, connect the cables according to the labels, and then power on the USG device. For details, see Hardware Installation.

Follow-up Procedure

After replacing the device, pack up all the tools. If the old USG device is faulty, fill in the Repair Transmission Sheet and send the faulty device with the Repair Transmission Sheet to the equipment supplier or the specified repair service provider.