Harman Kardon 50 Owners Manual - Page 17

HUM AND NOISE In any high fidelity installation, hum may be caused by the interconnection of a record player, tuner and amplifier, as a result of the cables and different grounds. If hum is experienced with your receiver, disconnect everything but the speakers from the receiver. If hum persists, reverse the AC line cord. Plug in the record player and if hum appears, reverse the record player power plug and connect a single lead from the record player chassis to the ground post on the rear of the receiver chassis. Connect your other devices in this manner. CAUTION: Hum may also be induced by defective connecting cables or by running these cables too close to a strong AC field. SERVICE If this instrument should not perform properly during the first two (2) years after date of purchase, contact the factory for instructions. The factory has many authorized warranty service stations in the United States. To aid us in selecting a service station convenient to you, it would be helpful if you would indicate which major city is closest to your home. Please write our Customer Service Department, Harman/Kardon, Incorporated, Plainview, New York 11803. Be sure to include the model and serial number of the unit. A brief description of your other components is often of help in answering your questions. DO NOT return this instrument to Harman/Kardon without first receiving authorization. MAINTENANCE If it is necessary to clean the dial glass or plastic insert on your escutcheon, it is recommended that you use an anti-static cleaning fluid such as the type used for cleaning records. This type of cleaning solution is available at any store selling phonograph records. If any other type of cleaning agent is used this may result in the removal of the lettering on your escutcheon or the adherence of lint or dust to your escutcheon. 16