Harman Kardon HK930 Owners Manual - Page 13

STEREO INDICATOR A stereo indicator is located directly behind the dial glass and operates in conjunction with the FM position of the Function switch and the Stereo Auto "IN" position. The indicator visually shows the reproducton of FM stereo through your receiver. To tune for FM stereo proceed as follows: 1. Place the function selector switch in the FM position and the Stereo Auto switch IN. 2. Tune to the station of your choice using your tuning meter for precise and accurate tuning. Your stereo indicator will now show if you are tuned to a stereo program. If the indicator is off, the program you are listening to is being broadcast monophonically. TUNING METERS Your Receiver incorporates two D'Arsonval movement tuning meters for precise and accurate tuning. The FM balance meter is designed to operate on a null or "zero" center principle. Therefore, the meter pointer should always be at the dead center position of your meter dial for optimum listening performance. To accomplish this, rotate your tuning knob slowly, in one direction towards the station of your choice. As you tune through the station you will notice the pointer swinging from the left or right past the zero center. THE CORRECT POINT for minimum distortion and optimum FM reception is when the pointer is resting at the "zero" center position. The signal strength meter shows the level of the incoming signal. When used in the FM position you should operate in conjunction with the FM balance meter and tune for maximum indication on the signal strength meter as well as a "zero" null on the balance meter. When used in the AM position you simply tune for maximum indication. FUNCTION INDICATOR LIGHTS The function indicator lights are located behind the dial glass and visually indicate the position of the function switch. DIAL SCALE The dial scale on your receiver is marked with three scales, namely, an FM frequency scale (88-108 mc), a logging scale (0-100), and an AM frequency scale. Since most FM stations operate at frequencies which are not whole num- bers (such as 96MC as compared to 96.3 MC). Ideally, each megacycle division on the frequency scale should be divided into 10 parts to enable the user to pinpoint the location of the station. This would require a dial scale which would be longer than the front panel. The logging scale which is divided into 100 equal parts provides a means of finding your favorite station, once you have noted its position on the logging scale. For example, in New York City, WQXR operates at 96.3 MC. After locating this station through the use of the frequency scale (between 96 and 98 MC), you find that the pointer may fall on 42 on the logging scale. Make a note of this setting. For future tuning to WQXR simply set the pointer to 42 on the logging scale. EQUALIZATION In order to achieve good reproduction of the wide range of frequencies in music and to make necessary adjustment for the limitations of the recording technique, record manufacturers have found it necessary to modify the actual frequency response of the music while it is being recorded. Thus, to avoid overcutting and consequent distortion, a measured and deliberate reduction is effected in low frequency response by selecting a "turnover frequency" and recording attenuated response below that point. To assure optimum signal to noise at the high frequency end when the record is played at home, the highs are deliberately exaggerated during the recording process. A measured and deliberate boost is affected above a certain frequency. This combination of deliberate exaggeration at the low and high ends of the frequency spectrum can be expressed in a recording curve. When the record is played a mirror image of that curve should be available so that the ideal "flat" response may be achieved. The PHONO positions of the function switch automatically introduces the proper equalization. STEREO HEADPHONE RECEPTACLE The stereo headphone receptacle located on the front panel will accept any stereo headphone with any impedance rating. The headphone receptacle is "on" at all times. 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. 12