Question about Harman Kardon AVR 300 Receiver

5 Answers

When I turn the amp on the view screen flashes protection

I purchased the amp from a second hand shop down town and when I brought it home I plugged it in , turned it on and received the protection instruction. I immediately turned the unit off and began to research the problem. I currently do not have any speakers hooked to the am. Would that cause me to receive that error do to an imbalance?

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  • jcannon1969 Dec 20, 2008

    I attempted to try the amp again after cleaning the amps speaker terminals and cleaning the entire unit. I researched the problem throughout the night and found no solutions that work. Please help.

    John Cannon


  • jcannon1969 Dec 20, 2008

    The amp is a Harmon Kardon AVR300

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5 Answers

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  • Master
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The Speaker not hooking up could be the problem John but it could also be that one of the channel(out put) is shot, but let us not jump to conclusion hook the speaker to it then try again.good luck buddy

Posted on Dec 20, 2008

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  • Master
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John I would take it back, unless it's a fuse it is extremlly to difficult to troubleshoot that kind of problem over the net. you need the schematic, which may be nside on the panel, but then you need a voltmeter and the like, just not worth it. Take it back before they tell you that it's not their problem, which they will do if you wait. Here in Florida they have to giv you a refund if it's within 3 days,, check yout local laws.

Posted on Dec 20, 2008

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  • Harman Kardon Master
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Protection is caused by a short ,m a bad voltage, or a component that has blown.

Unplug power cable, if you still get protection, then the unit is faulty, get your money back.

Posted on Dec 20, 2008

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  • Master
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Hi and welcome to FixYa,

Offhand, most current designs of receivers/amplifiers have built-in diagnostics that triggers the protection mode to kick in if the diagnostics senses a fault. One of these faults is a short in the speaker/speaker wire. The opposite also holds true, it would trigger protect is there are no speakers connected. An amp would self destruct either way, shorted speakers or open speakers (or as in your case, none connected)

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 20, 2008

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  • Master
  • 470 Answers

What is the model of your AMP??

Posted on Dec 20, 2008

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1 Answer

Why did amp indicate error and turn off?


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Dec 26, 2015 | Pioneer Audio & Video Receivers

2 Answers

My teac ag-790a 'protect' error message on display. When I brought it to the audio shop for repair it worked fine; at home again the same problem? What is the problem? Tx.


Hello
Check the putput wirings to speakers. If any of them has short circuit, the set will go to protection mode. You can understand it well, as it did worked fine at the repair shope. The set has no fault at all, but the wirings, connects to it have.
Just power ON the set at your home, without connection any output or input to it. See, it will not show any protection mode display. Switch it OFF. Connect the output to speakers, one at a time, and switch ON the set. Just do it for all other speakers. This way, you can find out, which speaker line causes the set to go to protection mode. Fine out the reason.
Never connect any input to the system, until works fine with out showing any protection display.
I helped you somewhat fine, I assumes.
Ok.

Jan 31, 2012 | Teac Audio & Video Receivers

1 Answer

Having problems with my SONY str-db798 amp. When i turn it on (without any speakers or even with speakers) it flashes "PROTECT" and shuts down. Any suggestions how to deal with it without getting...


Press and hold down the power button on the front panel until you hear a secondary "click" from inside the chassis. That takes about 15 seconds.

Then read my tutorial on how to keep your receiver out of protect mode.

Sep 03, 2011 | Sony STR-DB798 Receiver

1 Answer

PROTECT is flashing on our Sony Digital Audio/Video Control Center


PROTECT means the receiver is automatically powering down to protect it's amplifiers. Top reasons are overheating, which can be caused by poor ventilation, covering vent holes, excessive volumes for long periods of time, or it's actually just that hot in the room, which, with the current weather, I've encountered in clients homes before. The other option, and just as common if not more so, is that the speaker wire outputs are shorted out and are causing the amp to turn off. The easiest way to test this is unplug all of the speakers and turn it back on. If it still says protect, then it's either too hot or there is a physical problem with the protection circuit and needs to be serviced (this would be a good time to kick yourself for buying a sony receiver). If it DOES power on, plug in the speakers one by one, and if the amp goes into protect mode as soon as you plug in a speaker, it's an issue with that one. Check for short circuits in the line (kinks, frayed ends, staples going clear through the wire, etc). If the wire looks good, try putting a different speaker at the end. If a different speaker works, then the speaker is blown, which gives 0 continuity, and the receiver is correctly protecting itself from the high impedance load. Change the speaker.

Sep 08, 2010 | Audio & Video Receivers

1 Answer

It dont turn on. theres red light flashing. is like in protection or something, it last a few seconds and then turn off.thanks for your cooperation


If you have done a reset by holding down speaker a and b buttons while plugging in. Hold buttons for a few seconds then release.If goes back to protect mode then you have a shorted output channel. Most repair shops will charge from 150-200 for repair, there is a lot of parts you have to replace on this model.

Apr 01, 2010 | Denon AVR-1905 Receiver

1 Answer

System Protect mode after a Flash fire.


The flash probably was a small resistor burning. While not particualrly common, it does happen. The output transistors are shorted and need to be replaced. If the same channel is bad as the first time, there is a possability that the unit was not completely repaired. Some shops only change the shorted transistor within the transistor pair. This is poor practice and usually leads to another failure of the same channel Check your previous invoice for the parts replaced. The entire complimentary pair of output transistors should have been replaced. If only 1 iof the 2 were replaced, you may have an argument for a warranty repair.

Please keep us posted on your progress.

Dan

Dec 10, 2009 | Onkyo TX-DS838 Receiver

1 Answer

When I turn on my receiver, it automatically turns off and the power button flashes red. Prior to shut down, the receiver display notes "Tuner Ext. In" What's the problem? It has worked p


Protection circuit turns off the unit because of critical conditions- wrong power supply voltages or one of the power amplifier channels is bad. First, visual inspect the power amp board near the heat sink for burned resistors, test outputs for a short. If there are no problem you may try to turn the unit on and you have several second before it shuts down to check power supply voltages and power amp output voltages and bias, then ... Long story you'd better take it to a repair shop or repair at ebcelectronics.com

May 09, 2009 | Denon AVR 2808Ci Receiver

1 Answer

Brand new avr588 receiver is turned on....is on for five seconds and then cuts off to standby


Hi donnie025,

I can't believe you haven't received an answer before now.

The red flashing light normally indicates that the protection circuit has been tripped. It can be caused by something as simple as a short in a speaker wire. Even if there is one strand of loose wire that makes contact with the back of the receiver, another wire, etc. it can cause a short. To protect itself the receiver will simply shut down.

1st. I would suggest disconnecting all the speaker wires from the back of the receiver. Then turn on the receiver (obviously you won't hear any sound) and see if the receiver does the same thing. If it does you should try disconnecting all of the source components (DVD player, Cable box etc.) and try again. If it still does it the receiver is bad and needs to be serviced or exchanged if you still can.

2nd. If the receiver stays on after you disconnect, then turn off the receiver and connect one speaker at a time, then power on the receiver at test it after connecting each speaker. This way if it suddenly shuts down after connecting a speaker you know which speaker or wire to check.

Let me know how it works out for you, I hope this helps if you haven't figured it out already.
Matt @ OneCall
www.onecall.com
twitter.com/onecalldotcom

Nov 08, 2008 | Denon AVR588 Receiver

1 Answer

Turn on then shut off


Unit is going into protection and then shutting down. No way to tell what is wrong. Could be blow amp channel or bad power supply.

Sep 03, 2007 | Kenwood VR-357

1 Answer

Amp keeps switching off


There is a problem with one or both of the audio amp circuits. The amp is going into a protect mode as to protect and save your speakers. Sorry but there is no simple fix. this will need to go to the shop to be diagnoised. Good Luck

Apr 29, 2007 | Onkyo TX-SV373 Receiver

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