Question about Harman Kardon HK 3480 Receiver
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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Posted on Jan 02, 2017
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Disconnect speakers and wires. Bad wiring or defective speakers may be loading the amp down and causing the protection circuits inside to disconnect (no sound). If the HK is heating up (beyond what you perceive as normal) with no wires or speakers connected then you have a problem requiring expert repair.
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