20 Most Recent Harman Kardon HK 3480 Receiver Questions & Answers


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.

Harman Kardon HK... | Answered on Oct 27, 2020


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.

Harman Kardon HK... | Answered on Nov 25, 2016


Never use maximum volume for troubleshooting. The errant switch or control that you eventually find and flip will suddenly release the amp's full power and you'll destroy your speakers. If a signal isn't audible at 1/2 volume it's probably not there.


There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

Harman Kardon HK... | Answered on Apr 19, 2012


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.

Harman Kardon HK... | Answered on Feb 27, 2011


The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

Harman Kardon HK... | Answered on Jan 16, 2011


Is this a new installation or did this problem just appear spontaneously?

Perhaps MUTE is on. Don't troubleshoot this with the power turned up because you may suddenly find a wrong settign and blow up you speakers.

Harman Kardon HK... | Answered on Dec 26, 2010


Hello,


Usually a receiver suddenly cutting off will indicate a bad transistor in the amplification section. I suspect that the control circuit is sensing a fluctuation in the power supply and making it cut. (assuming that the protect circuit itself is working properly) If a voltage is too high the unit will go in to protect mode to prevent damage to the speakers and the rest of the unit. I would take the unit in to a local repair shop and get a estimate of repair charges. Expect a 60 to 80 dollar repair charge depending on how many parts need to be replaced and what the repair labor rate is in your area.

Hope this will help in solving the problem.....

Harman Kardon HK... | Answered on Dec 17, 2010


These means that the output stage is already blown out (maybe from pre-used short circuit speakers' cables). I suggest you to get it at a technician in order to locate and replace the blown parts.

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Harman Kardon HK... | Answered on Sep 13, 2010


audi amplifier IC,s burned need to replace them

Harman Kardon HK... | Answered on Jun 05, 2010


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.

Harman Kardon HK... | Answered on Apr 01, 2010

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