Harman Kardon AVR 65, Service Manual

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harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 (516) 496-3400
harman/kardon
Service Bulletin
Service bulletin # H/K9805 Rev. 2 January 2003 This is considered a Minor Repair
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
speakers in one or more channels”, perform the necessary steps listed below:
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 & FU482; 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 mm
2
) 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.
10. If this does not solve the problem, replace rectifier bridge D482, h/k Part# J2203336007X.
Model Serial number (120V) Status Action
AVR65
JS0003-01001
to
JS0003-07704 *
Needs Modification
Steps 1-9 only
Replace FU481 & FU482;
Attach ground wire
according to instructions
AVR65
JS0003-07705
and above
Changed by factory
Steps 1-9 only
NONE REQUIRED
Steps 1-9 only
* 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.