The most critical aspect of maintaining PCB etching equipment is ensuring that the nozzles are clean and free from obstructions, allowing for smooth spraying. Blockages or build-up can cause uneven pressure during spraying, resulting in inconsistent etching and potentially ruining the entire circuit board. Regular maintenance of the equipment involves replacing damaged or worn parts, including the nozzles.

However, the most pressing issue is keeping the etching machine free from build-up. Excessive build-up can disrupt the chemical balance of the etching solution, leading to more severe build-up. Sudden accumulation of build-up is a sign of a chemical imbalance and should be addressed by using a strong hydrochloric acid for proper cleaning or supplementation of the solution.

Additionally, residual film can also contribute to build-up. When a small amount of residual film is not completely removed, it can dissolve in the etching solution and form copper salt precipitation. This indicates improper film removal, often caused by a combination of edge film and over-plating.