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Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation, e) If the product has been dropped or damaged in any way, and f ) When the product exhibits a distinct change in performance - this indicates a need for service. 22) Replacement Parts - When re placement parts are required, be sure the service techn