Question about Harman Kardon HK 3480 Receiver

Amplifier/receiver switches off systematically after a few second of use

I have got a problem with my receiver Harman Kardon HK 3480 . When I switch on the receiver , it looks correct a few seconds ( blue light and display showing the radio frequency ) but a few seconds later , the word " protect " is displayed and the received is switched off . I can hear a "click" noise ( relay ? ) coming from the left rear side of the receiver .

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Mike Duncan

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219 Answers

Sounds like a bad output channel is causing it to go into protect mode. Time to see a repair tech.

Posted on May 02, 2007

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Posted on Jan 02, 2017

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1 Answer

Not getting any sound out of speakers help please :(

You need to set the device on the aux mode. Connect the cable at aux. Sign at the back of the device

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Hello,

Are you sure that is the part number? The HK-3480 uses a KTC3114A and is quite easy to find. Q317 and Q318 in your receiver.

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Reciver goes into protect mode as soon as I turn it on.

Remove speaker wires and try again. If it still goes into protect mode, the problem is internal...shorted power transistors or some other fault. Check fuses also.

Apr 01, 2010 | Harman Kardon HK 3480 Receiver

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Why does my harmon kardon reciever keep protecting when i turn it on? i checked the fuses.... nothing wrong...?!?

Check the speaker wires.
Make sure your ohm loads are stable especially if you are using more than one pair of speakers to any output.
Check the starting volume.

Nov 23, 2009 | Harman Kardon HK 3480 Receiver

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I have a Harman Kardon HK-3375 stereo receiver. I

A power switch either works or does not work. It does not power on and then mysteriously power off like yours is doing.
You have some sort of power relay that is being powered off after a few seconds.

I would check out the power supply for your anomaly. And no, it is not a simple fix like you are capable of performing.

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No speaker sound with hk 3480.

your fuses are blown by possible crossing speaker wire - and + together. I did this and kept turning it on but I ended up frying the unit. Check your wires and make sure that they are seperated properly. If problem continues then unscrew the shell and replace 1 or all 3 fuses (depending on what was blown) with GMA 8 amp fuses. good luck.

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