Huawei NetCol8000-A Maintenance And Troubleshooting Manual page 46

Replacing Heat Dissipation Fan
Step 1 Open the front panel of the
electric control box;
Step 2 Remove the fan from the
electric control box;
Step 3 Remove the three M4 screws
connecting the heat dissipation fan with
(1) Dissipation fan
the structure, remove the sheet metal,
and take out the fan;
Step 4 Install the new fan in the
inverted sequence of Step 3–Step 1.
During the installation, tighten M4 and
M6 screws to torques of 1.2 N.m and 3
N.m respectively using a socket wrench.
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Page 47