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Disassembling and Check
1. Remove sealing rubber strip.
2. Remove the top cover screws.
3. Remove top cover.
4. Remove the locking hook and hook.
5. Check the top cover for cracks, damage or wear. Replace it if necessary.
6. Check the sealing rubber strip for cracks or damage. Replace it if necessary.
7. Check the top cover silencer for cracks or damage. Replace it if necessary.
8. Check the locking hook and hook for cracks, deformation or damage. Replace it if
necessary.