20 Most Recent Harman Kardon AVR 300 Receiver Questions & Answers

Try another remote first, such as a universal one. If that doesn't work the system, the I/R unit inside is bad. If you want to fix it yourself you might want to hunt down the service manual for it. You can trace back from the I/R sensor to the PC board and see if there are any parts that can be replaced. You could even try changing the sensor itself.

turn OFF avr 300 and unplug the ac power supply and also unplug the speakers terminals,input signal (optical ,coaxial,video1,.etc) after that you turn ON AR 300.

AC (alternate current) receivers have amplifiers in them. Those amplifiers have capacitors in there. What the do is store massive amounts of electrons. What that means is if you touch one it will electrocute you. I have to recommend you take it to a tech to have this addressed. This is purely for your safety.

Hi, Check the speaker wires that they are not shorting. Check the fuses on the back and then unplug it for 10 minutes. Good luck.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Hello Sir, Hi, you may try the following

1. try cleaning the switches
2. if this does no solve the problem, its the selector circuit. this may be digital, so you need to search the IC that selects the FM mode both with tuning. this is fair complicated.
3. buy a cheap separate FM tuner, run it on auxiliary input.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Attach the analog RCA output of the Sonos to the CD input of your receiver. On the receiver select CD is the input. Now turn the volume up on both the Sonos and the Receiver. Dont forget to make sure some music is playing on the Sonos.
Good luck

If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage.
Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage (like squashed or rodent damage).

Most of these HK receivers have a 3.6v rechargable battery on the front panel board. If the battery dies, you lose memory when it is turned off/unplugged/power failure. The battery is soldered on the board. Not replaceable by the user unless you are a tech. It should keep memory if left in standby.

Remove all the input cables and see if the speakers still hum. If they do you have a problem in the amplifier, probably a bad capacitor. Remove the power and open the unit by removing the case. Should be screws on the back and side. Find where the power cord comes in and follow it to the board. This is the power supply section. Look at all the different sized cylinders (electrolytic capacitors) in that area for bulging. Replace any which look suspicious. Also inspect all the electrolytics throughout the unit for bulging, replacing as necessary. If this does not solve the problem you will probably need to take it to a tech for repair. If the unit quits humming after removing all the inputs you have a cable or cables with a broken ground. Get a known good cable, preferably new, and check the unit. If it still works OK, replace each input until the hum comes back. That will be the bad cable. Toss it and keep going until you get all the bad cables weeded out. Let me know if you need anymore help.

hardrocko

Thanks for using FixYa

If anything works after it is moved suspect a bad solder joint somewhere.

The protect message means that the outputs are shorted. This is a fairly common problem that can easily be fixed by any shop that handles audio gear. Expect a parts cost in the $20-$40 range.

Dan

Have you tried connecting an AV cable from yoursuboofer to your TV?
If so, what type of connection cable does your Woofer have?

Is your subwoofer apart of a surround sound system or is a separate unit?