将电子机械拆开，更换有故障的电子元件或机械部分，比如：齿轮、电刷、电枢等。
Dismantles electrical machinery and replaces defective electrical or mechanical parts such as gears, brushes, and armatures.
应及时更换已磨损到位的电刷，及时清除机器灰尘、杂物等。
Replace timely worn or damaged electric brush. Remove timely dusts, small pieces and etc.
检查电刷磨损情况，及恒力弹簧是否变形，电刷磨损过多或恒力弹簧已变形予以更换。
Check the wear of the electric brush and see whether the constant force spring has distorted or not. Over-worn electric brush and distorted force spring should be replaced.
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