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The fuse can be replaced by unscrewing the two 3/32” hex bolts with a standard allen
key. Underneath the fuse cover the fuse can be pulled and replaced like any standard
automotive fuse. Under ordinary operating conditions, the fuse should not need to be serviced.
If the fuse is replaced by the user or the fuse cover removed, it is important to replace
the fuse cover paying special attention to not pinch the charging cable and ensure it is seated in
its passthrough notch before applying force to the hex bolts.
2.5 Main switch
The main switch of the EMG-02 controls both the power electronics and the discharge
resistor. It has two modes: ON and OFF.
When the switch is placed in the ON position, the battery will be connected to the main
electronics of the gun and the capacitors will be commanded to charge by the microcomputer.
The microcontroller will charge the capacitors through the charging cable. There are two high
current relays inside the EMG-02 which toggle the flow of current during startup. The user may
hear several clicks as the unit starts up. The first relay toggles the flow of charge into or out of
the capacitor through the resistor and charging cable, the second relay toggles the main high
current bus between the capacitor/battery and coils. When the EMG-02 shuts down, the first
resistor is de-energized and enters into a failsafe (discharge) mode, allowing charge to flow out
of the capacitor, through the cable and resistor and complete a circuit to ground. When the
EMG-02 starts up, the same relay allows charge to flow from the battery through the same
resistor and into the capacitor.
This system allows the EMG-02 to fail into a capacitor shorted (safe) configuration
where the capacitor will always be discharge as long as the unit is de-energized with the battery
removed. However, because the discharge resistor serves double duty as both a charging and
- Always ensure the main switch is in the OFF position before inserting the battery.
- Always ensure the main switch is in the OFF position before removing the battery.
- Do not rapidly toggle the main switch with the battery inserted as this could cause
excessive heat buildup in the discharge resistor or damage to internal circuitry.
- After the main switch is toggled (on->off or off->on) wait at least 60 seconds before
toggling again.
Main Switch
Summary of Contents for EMG-02
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