1. Disconnect the main power. Remove the 4 screws on right cover by knob wrench (one of the accessories in pack list), then remove the right cover.
2. Remove the 2 screws on the main switch and take it off. Red highlighted in below figure
3. Remove the red highlighted screws in Figure 1.3 - 4, take the 4 related the terminal lugs out(don't take off other lugs not belong to main power switch). Then the main switch can be removed. When to install the new main power switch, refer to figure 1.3-5 to connect the terminal lugs.
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4. The fuse is located under the main switch (blue highlighted Figure 1.3-3), press the black cap by a straight screw driver and rotate it anticlockwise and take the fuse out. Replace the fuse as needed. Figure 1.3-6