When servicing, use only identical replacement parts. Use of any other parts will void the warranty. Only use accessories intended for use with this product. 11. Do not operate if under the influence of alcohol or drugs. Read warning labels on prescriptions to determine if your judgment or reflexes are impaired while taking drugs. If there is any doubt, do not operate the product. 12. Maintenance. For your safety, service and maintenance should be performed regularly by a qualified technician. S