Harman Kardon ST360A Owners Manual - Page 4
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causes speak problems in tuning. The Madrigal II Model ST300A interposer a special electronic circuit known as AFC (Automatic Frequericy Control) that overarms these problems and insures proper tuning even if the manna) tuning is not accurately dogw. Therefore AFC always keeps the statist In the center of the channel and Ohninates distortion mourn' by inaccurate tuning. It should be pointed out that AFC is not a mean to eliminate tuner drift. A fine piece of electronic equipment as the ST360A will not drill on any FM molt button position whether on FM or Fhl-Alt The following experimcmt will lead to an understanding of AFC, and the fuller °Musks of the ST300A tuner. Tone aeross fists FM band with the push button selector switch in the fildAFC position. Note how the nations "pop into plan:. New tune to any station, preferably one with a musical program. Defeat the ADC circuit by depressing the FM pushbutton, and time slowly through the station from kit to right. Notice there are three distinct points where tlw station sounds dos, Intetsposed with points of distorted sound. The middle clear-sounding point is the proper turning position for the best tone quality with minimum noise and 'Moderns& Dctune the station so that the sound Is glistened. Now depress the FM-AFC push button and notice how the sounds clear up. The tuning has been readjusted by the operation of the AFC circuit, which automatically suss the electronic circuits to the center of the station channel. In order to take advantage of the lene0ts of AFC. It is suggested that fine tuning be done with the T ht button selector in the FM pacifier*. When the push button selector is then . cased In the Fed-AFC position am automatic for(nosey control circuit wit improve your careful toning by a tuning factor of 10:I. The proeeduro Is especially secommended when a amok station is being tuned on a channel adjacent In a stronger one. This will prevent the AFC from reaching for the more powerful signal thereby skipping over the weaker one. Whenever a weak station is tuned. the AFC aim* shoold be defeated. ADJUSTMENTS In seine installations. hum may be encountered due to a voltage difference between the amplifies, tuner amt record player chant. lids may he eliminated by !evening one or all of the AC power cords. Simply reverse nne rat n time until improvement is experienced. It is recommender' to test the tubes of this tuner approximately evert twelve months. When a tube is changed it may be necessary to have the tuner realised to insure optimum Terroristic°. For: The ST300A is fused at the AC primary to prevent the damage of tubes or components. The value of the fine is 3A-3.AC and should by replaced only with one of the same rating. Replacing with a fuse of higher rating will not protect rim tuner. and may result in severe damage. which will not be coy. eyed by the factory warranty. MAINTENANCE AND REPAIRS If your tuner should not polies'properlyduring thefint year after date ofpoiclass, contact the factory for instnactions. Do not have it repaired locally without fint checking with Ilannan.KartIon. Authorized factory warranty stall/in arc located in most sake cities. For the address of the station nearest you, or for any other information concerning your tunes or other Hannan-garden products. please write directly to the Or:dome Service Departmmt, Ilannan.grualon. Inc. al Main Street. Westbroy, L I. New York. Be sure to Include the model number and serial number of the unit in question. A brief description of the oilier components in your high fidelity installation is often of help In answering your epsilons. We are always happy to he of service to you. WARRANTY POLICY We urge you to completely fill m you, wari.uity card and mail it to the factory without delay to protect your rights under warranty. The warranty cards ore carefulbr filed for reference and should yourself° information on tlw use of this high fidelity unit. or repair soviet. we will be able to immediately identify your set and reply quickly. NOTE: It is nocessaty to receive factory atithrnization before returning a set for warranty repair either to the factory or to on authorized station. Repairs are to he returned on an Rapreas Prepaid basis. A letter describing the exact dim. sky must be included with the set upon return. We warrant this instrument to be free from &deem in material and workmanship under normal use and service, and in accordance with the conditions herein below sot forth. for a period of one year from date of delivery to the original imrelsarer, and agree to replace or repair any part or pats, with the °smitten of tithes which are covered by manufacture's 00 day watranty. re. tunnel to us within said one year with imnsportation prepaid. and which our examination shall disclose to our satisfaction to have been thus defective. This warranty does not Include free labor, nor ft It applkable to any instrument which shall have been repaired or altered in any way so as in our judgment to affect its stability or reliability nor which has been subject to mime, neglect. abuse, negligence or accident, nor which has had the serial number altered, effaced nr removed. Neither shall this w.uranty apply to any instrument which has boot connected ethenvise than in accordance with the Mansions fianfisIsed by us. This warranty is expressly in lieu of all other warrtudier, express or implied, and of all other obligations or liabilities on our part and we Waller assure rem llUthefin! any representative or other person to ;MUM* for us any other liability in connection with the saki of this instniment.
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