HarmanKardon-AVR65-avr-sb维修电路图 手册.pdf

harman/kardon Service Bulletin Service bulletin # H/K9805 Rev. 1 January 1999 To: All harman/kardon Service Centers Models: AVR65 AM/FM Receiver, North America (120v) version Subject: Hum or Buzz in loudspeakers In the event you receive an AVR65 with the complaint of “There is a hum or buzz coming from the peakers in one or more channels”, perform the necessary steps listed below: s 1. Disconnect all external cables including power cord. 2. Remove the (14) screws holding the top cover to the receiver; remove cover. 3. Locate Fuses FU481 they are on the Main PCB in the right front quadrant of the receiver. 4. Remove and discard FU481 and FU482 and replace with h/k part# FS1067, (2A Slo-Blo 5 x 20mm GMC type). 5. Replace the top cover; set the unit on its side on a padded surface. 6. Remove the (8) screws holding the bottom grille screen in place. 7. Locate power supply capacitors C481/C482 and IC482 (See diagrams); they are located in the right front quadrant of the Main PCB. 8. Solder an insulated 16 - 20 gauge (0.5 to 1.0 mm2) jumper wire between the common (ground) point on C481/C482 (8200 63v) and the ground lead on IC482 (-15v regulator). 9. Replace bottom screen; re-connect all external cables and test the receiver. Model Serial number (120V) Status Action AVR65 JS0003-01001 to JS0003-07704 * Needs Modification Replace FU481 Attach ground wire according to instructions AVR65 JS0003-07705 and above Changed by factory NONE REQUIRED * Any unit in this serial number range with a small green dot attached to the left of the serial number on the outer carton has been modified. harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 (516) 496-3400 RadioFans.CN