Question about Harman Kardon HK 3480 Receiver

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Harmon/Kardon 3480 When trying to hook up our receiver to outside speakers, the receiver states "protect" and shuts off. This happens as soon as the power is turned on to the receiver. What did we do? What can we try???

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  • Beth McFarland Jun 01, 2007

    The speakers aren't hooked up right now, but it is still doing the same thing. We are trying to reset, but it won't work. Can we try something else?

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  • Master
  • 934 Answers

Beth, Protect mode in this unit indicates an open or short problem in one or more of the primary amp IC's in this unit. For a qualified shop this is a bit of a challenge sometimes disasembling the unit to put the amps in... The amps sit on a large aluminum heatsink and and each have their own set of feed resistors and caps. Each amp found to have failed should have their compliment of resistors and caps tested in orfer to prevent premature failure of the new amp(s)... If you're looking for a repair shop to do the job find someone who specializes in stereo receivers and amplifiers. If you're not sure where to begin you might call NESDA (National Electronic Service Dealer's Assn.). They can direct you to a member shop in your area... Hope this helps, Good Luck! Bill

Posted on Jun 04, 2007

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Protect mode


have you ever been able to hear anything from this unit?

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