Wipe the discharge needle and the surrounding Particle with a cotton swab or a dust-free cloth dipped in alcohol every week to confirm that there is no carbon deposit at the tip of the discharge needle.
Every week, use a cotton swab or dust-free cloth dipped in alcohol to wipe the discharge needle and surrounding particles, and confirm that there is no carbon accumulation at the tip of the discharge needle,
Wipe the discharge needle and surrounding Particle with cotton swab or dust-free cloth every week, and make sure that there is no carbon deposit at the tip of the discharge needle.