1.Remove or install power circuit of UV flatbed printer without turning off main power.
2.Fill in different batches of inks or use inks or cleaning liquid with bad quality.
3.Use air gun with high pressure to hard clean printer head when print head is just slightly blocked.
4.Fully soak printer head in cleaning liquid or leave cleaning liquid in the printer head for more than two days.
5.Use tools without passing quality inspection to clean printer head.
6.To adjust printer head position with brute force.
7.Pay no attention to other system when clean printer head.
8.Use ultrasound cleaning machine to clean printer head for more than 3 minutes.
9.Neglect the ground cable safety.