Harman Kardon STEREO RECITAL TA224 Owners Manual - Page 10
MAINTENANCE, REPAIRS, Noise, Output, Balancing, Controls, Replacing, Tubes, Checking, Service
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MAINTENANCE AND REPAIRS 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 the TA224, disconnect everything but the speakers from the receiver. If hum persists, reverse the AC line cord. Also perform the balancing adjustments outlined in a later paragraph. 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 a good ground point on the chassis of the TA224. Connect your other devices in this manner. CAUTION: Hum may be also induced by defective connecting cables or by running these cables too close to a strong AC field. Output Tube Balancing Controls: There are two OUTPUT TUBE BALANCING CONTROLS located on the top of the chassis near the output tubes. These controls are factory adjusted and should not be touched unless tubes are changed. If adjustment is necessary follow the procedure listed below. 1. Set the LOUDNESS CONTROL to minimum. 2. Slowly rotate each BALANCING CONTROL for minimum hum. 3. If the hum level is not readily apparent, set the control to the mid-position. 4. For absolute accuracy use an IM analyzer and set for lowest IM distortion. Replacing Output Tubes: It is permissible to replace the 7408 output tubes of this receiver with 6V6GT's. This may cause a slight power loss and a slight increase in intermodulation distortion. Fuse: This receiver is fused in the AC primary with a 4 amp-MTH fuse. It is located underneath the chassis near the line cord. Replace if necessary, only with the same size used. Tube Checking and Service: It is recommended to test the tubes of this receiver every twelve months in order to insure optimum performance. When a tube is changed in the tuner portion, it may be necessary to have the instrument recalibrated and realigned. If this instrument should not perform properly during the first year after date of purchase, contact the factory for instructions. DO NOT have it repaired locally without first contacting Harman-Kardon for advice. The factory has many authorized warranty service stations in the United States, and for the station nearest you, please write or call our Customer Service Department, HarmanKardon, Inc. 520 Main Street, Westbury, L. I., New York. 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.