20 Most Recent Denon AVR-1508 Receiver Questions & Answers

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.

On this receiver if it goes on protect the most common cause is the power supply voltage specifically 15 volts and -15 goes low and the protection kicks in. Replace kia7815 and kia7915 . You can monitor its voltage on the board where it says 15 and -15 v chances are one of the voltage is low thats why protection kicks in.

Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off). always add speakers in pairs (L&R) before testing to prevent possible protection circuit, test main speaker pair first then add surrounds (all according to the allowable Ohms range for the amp of course)

What I think is happening is that you have a fault in the main amp somewhere which after a while gets hot and creates an overload situation. It's going to be a tricky thing to spot unless you have a good knowledge of electronics. For example Capacitors can cause such faults. Sometimes you can spot them with the eye. For example the top of them might be bulging out. But unless you know, take it to a trained technician.

connect the hdmi to the tv (hdmi input 1) and to the receiver (hdmi output) you must make sure that the receiver input settings are assigned correctly. Then hook up all of your devices to the receiver. remember that the 1508 dosent do hdmi upconversion, so if you have any devices that are NOT hdmi, you need to run rca cables from the output of you receiver to the input of your tv. If you have any digital inputs coming out of your devices, i would recommend using them. your 1508 has two inputs that are assignable.If all of your devices are hooked up to your receiver, and its hooked up to your tv properly, just turn down the sound on your tv, and turn up the volume on your denon!

1) turn off the main power button (not the big LED stanby button) 2) press and hold "input mode" and "speakers" button simultaneously 3) press and hold the main power button for seconds, until display flashes. 4) release all those buttons. The AVR is already reset to factory mode.

That means they are no longer green or on and become red when turned off.

Press the power button, and speaker a and speaker b simultaneously and hold until the display begins to flash then release speaker A and speaker B buttons. That resets the microprocessor.