The procedures for safely discharging a capacitor are as follows:
The capacitor must be identified because capacitors come in a variety of shapes and sizes. Aluminum electrolytic capacitor utilized in high-voltage equipment. These have the appearance of a tin can with leads protruding from the bottom. Using an identification symbol of "" look for the cathode or negative lead of the capacitor.
The circuit board must be turned to gain access to the capacitor's lead. When flipping the circuit board, make sure you don't touch anything metal.
To discharge a capacitor, “touch the negative sign with the discharge pen's tip to discharge the capacitor's cathode then, touch the positive symbol with the negative sign to discharge the capacitor's anode”.