Huawei DBS3900 Installation Manual page 301

Replaceable Fuse
Use fuses of the same type and same rating to replace old ones.
Before replacing the fuse on the panel, disconnect the equipment power supply. Otherwise, an
energy hazard or electric shock may occur, causing body injury.
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Fuse Welding
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Replaceable fuses are installed on the panel next to the AC/DC power input port or
output port.
Reference the specifications of backup fuses or fuses on the panel to select the fuse type
for replacement. Using different fuses of different specifications may cause equipment
damage, body injury, and financial loss.
If the fuse rated value is silkscreened on the board, Huawei authorized personnel replace
fuses according the silkscreened specifications.
If the fuse rated value is not silkscreened on the board, do not maintain board fuses at
site. Return them for depot repair. To replace fuses, Huawei authorized personnel replace
the fuses according to the supplier model and rated value in the bill of materials (BOM).
Safety Information