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Involving no material consumption, such as machine detection.
Simple replacement of parts and accessories, such as switch, dial, motor, drive shaft, and eccentric block.
3rd Grade repair
Maintenance involving digital electronic control parts, such as maintenance and replacement of the electric control board.
4th Grade repair
Maintenance involving Li-ion tools, such as EB251, EB351, and EB350 series machines, or maintenance of lithium batteries and chargers.