Maintenance Safety

Wear an ESD wrist strap when replacing accessories or parts. Ensure that one end is grounded and the other end properly contacts the skin.
When replacing parts, account for all parts, bolts, and tools and prevent them from dropping into fans and causing damage to equipment.
When replacing cabinet shelves or parts, exercise caution when pulling them out to prevent injury resulting from falling objects.

Fuse Replacement

Replace fuses with the same type and rating.

Disconnect the equipment power supply before replacement to prevent electric shock and injury.

Install replaceable fuses on the panel next to the AC/DC power input or output ports.
Refer to the specifications of backup or panel fuses to select the fuse type for replacement. Using fuses of different specifications may cause equipment damage, bodily injury, and financial loss.

Fuse Welding

If the fuse rating is silkscreened on the board, Huawei authorized personnel will replace fuses with the specified rating.
If the fuse rating is not silkscreened on the board, do not maintain board fuses on site. Return them to the depot for repair. Huawei authorized personnel replace fuses using the supplier model and rating in the bill of materials (BOM).

Power Distribution Box and Board Replacement

Wear insulation gloves and ensure that the external-equipment circuit breaker is disconnected before proceeding.
When replacing a board, do not touch its components to avoid damage.
Install filler panels in all vacant slots.

Fan Replacement

Pull out a part of the fan module by its handles, wait until the fan completely stops rotating, and then remove the fan module from the subrack. Keep fingers away from fan blades.

Battery Replacement

For details, see section Battery Safety.