Harman Kardon SR900 Owners Manual - Page 11

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 SR900, 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 be also induced by defective connecting cables or by running these cables too close to a strong AC field. FUSES The SR900 uses three fuses to protect its circuits. The main fuse labeled LINE is used to protect the entire receiver while the other two fuses labeled SPEAKER FUSE CHAN A and SPEAKER FUSE CHAN B are used to protect the output power transistors. In the event of fuse failure replace ONLY with the same type used, Replacing with a fuse of a higher rating will not protect the instrument and may result in severe damage. Line Fuse-3 Amp-3AG Chan A Fuse-2 1/2 Amp-3AG Chan B Fuse--212/ Amp---3AG SERVICE If this instrument should not perform properly during the first two years after date of purchase, contact the factory for instructions. The factory has many authorized warranty service stations in the United States, and for the station nearest you, please write our Customer Service Department, Harman Kardon, Inc. Plainview, Long Island, 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. DO NOT return this instrument to Harman Kardon without first receiving authorization. PART NUMBER 1465420404 1466016206 H65410901 1-153012756 C65416751 H61220382 I-I46512117 H65420331 H61021529 H60720392 H28020512 H60120365 H63420092 H60120364 H63020300 H63220287 H63220286 H63220285 1-125520184 H24020203 1421520316 H21520316 H22020375 H24020314 H22020317 H23520388 H23520388 1-125017216 H10121377 H 10520420 H31120396 H31320395 H31321376 H31519981 1.131520461 H30821497 REPLACEIVIENT PARTS LIST - SR9000 DESCRIPTION LIST PRICE Phono Jack Transistor Socket Fuse Holder Line Cord AC Convenience Outlet Pilot Light Socket Pilot Light #1847 Headset Jack Dial Glass Pointer Terminal Board (No Components) Bottom Plate Jewel Top Cover Escutcheon Knob, Small Knob, Medium Knob, Large Rocker Switch Speaker Selector Switch Bass Control Treble Control Balance Control Function Switch (No Components) Volume Control Stereo Threshold Control Muting Adjust Control Power Switch Power Transformer Driver Transformer Electrolytic 3000 MFD. 30V. Electrolytic 3000/30V, 200/30V, 200/15V Electrolytic 400/60V, 1000/50V, 200/45V Electrolytic 25 MFD/30V Non-Polarized Electrolytic 2 MFD/25V Non-Polarized Condenser, Variable .15 .15 .85 .60 .35, .55 .20 .80 1.95 .35 .30 5.30 .20 4.30 15.75 .65 .70 .75 1.30 1.95 .95 .95 2.35 7.60 3.45 .70 .70 .60 16.75 5.20 3.50 4.00 3.45 .95 .73 3.50