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10. All cautions and warnings on the equipment should be noted. 11. If the equipment is not used for a long time, disconnect it from the power source to avoid damage by transient over-voltage. 12. Never open the equipment. For safety reasons, the equipment should be opened only by qualified service personnel. 13. If any of the following situations arises, get the equipment checked by service personnel: a. The power cord or plug is damaged. b. Liquid has penetrated into the equipment. c. The equi