AVR320 harman/kardon
harman/kardon Service Bulletin
Service bulletin # H/K2002-03 April 2002 Warranty labor rate: MINOR repair
To: All harman/kardon Service Centers
Model: AVR320
Subject: Transformer Hum or Buzz
In the event you receive an AVR320 with the complaint "There is a hum or buzz sound coming from the
unit", first confirm the sound is coming from the receiver itself and not at the loudspeaker output, then
replace the Power Transformer:
1) Remove the top cover (14 Phillips screws)
2) Locate the Power Transformer; it is attached with (4) Phillips screws.
3) All connectors terminating the cable harness consisting of multiple conductors need to be unplugged from
two main locations. Remove all plastic ties necessary to remove the harness. Most connectors have
"tabs" on one side that should be depressed before the connector can be unplugged.
4) Remove and replace the Power Transformer with h/k part# 55199320XX.
5) Replace the harness, add new cable ties, plug in all connectors, (replace Component Video PCB if it was
removed): replace the top cover.
6) Test the unit and confirm the hum or buzz is no longer present.
Model Serial Number (120v) Status Action
TH0044-01000
AVR320 to None Required
TH0044-03854
TH0044-03855
Hum or Buzz from Power
AVR320 To Replace Power Transformer
Transformer
TH0044-08419
AVR320 TH0044-08420 and above None Required
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