Question about Pioneer VSX-D409

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Unit turns off

Unit stays on for a couple seconds and then turns off on its own

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  • Anonymous Jan 08, 2009

    midway through playback the display read poweroff, and the unit turned off.

    I can turn power back on, but when the relay should "click" after 5 sec to power the amp circuit it displays poweroff and turns off

  • EARS 13 Feb 13, 2009

    What are the instructions i need to repair this my self?

  • jason May 11, 2010

    it will need repair , you will need to take it to an electronic repair shop , unless one of the speaker wires are touching the other terminal then the overload protection circuit is engaging because of that

    but if thats not the cause then it will need testing to fix the problem

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This unit is going into protect mode because it detects a problem. The unit shuts down to prevent further damage internally. This usually is caused by shorted output transistors in the final stage of the amplifier. This is a simple fis for any shop that does audio repair. Expect a parts cost between $15 and $30 along with the local labor rate. If you wish to attempt this repair yourself, update this and I'll try to provide you with more details and instructions. You will need a multi-meter and soldering equipment.

Dan

Posted on Nov 11, 2008

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I got similar issue and managed to fix it with excellent tech support from NAD. Flashing LED means system goes in to protective mode. Most probable reason is presence of DC voltage on amplifier out puts. In my case it was both surround amps. It had faulty resistor and a dry jpint at power line

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Unit only stays on for 4 seconds then turns itself off.


This is a short or unstable ohm load. Remove all speaker wire connections to see if the amp will stay on.
If the problem goes away when disconnecting the speaker wires try this:
1) Check volume level on zone one and zone 2 if connected. If it is too high the amp will go into protect mode and shut off exactly as you described.
2) Make sure no wires are touching any other wire or the metal surface of the amp. This will cause a short and send the amp into protect mode.

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What you are describing is the protect mode. These Denon receivers go into the protect mode for several different reasons.

Bad speaker connected - disconnect all the speakers and see if it stays on then when turned on. Disconnect speakers with power off. If it stays on then you need to find what speaker is bad and get it repaired or replaced. You can figure it out by connecting one speaker at a time with the power off and then turn it on. If it stays on, the speaker just connected is good, connect another speaker and try again. When you get to a speaker that causes it to go into protect you have found your bad speaker. Always turn unit off in between when connecting speakers. If the receiver turns off with all speakers disconnected you have another problem which will need to be diagnosed by a service center unless you have the proper tools and some electronic troubleshooting knowledge.

There are a couple of other reasons why these Denon's go into protect. A output channel is bad, a voltage regulator is bad, a supply resistor is open. Those are the 3 most common reasons for these.

I work at an authorized Denon repair center and fix a few of these every week. Unless it is a bad speaker it will require a lot of work. They are good receivers and normally worth the cost it would require for repair. Replacing the unit with another one of equal quality will almost always cost at least double the repair cost. There is no way to know just what the repair cost would be without troubleshooting it and then knowing exactly what parts need to be replaced. My shop would charge anywhere from $95 to $250 for this symptom, it just depends on which of the 3 most common problems is causing it.

If you have at least a multimeter and know how to use it, I can helpp you with figuring that out. If it has a blown channel the cost is the highest. The other 2 common problems only require 1 part each, a resistor which is less than a dollar, and the voltage regulator which costs only a couple of dollars. The blown channel requires many parts to be replaced and takes much longer.

Let me know if you need more help,

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Receiver turns for a fews seconds then shuts down


Hi.
If the word "OVERLOAD" is in your display, we have a bad channel.
But if only turn off, and the standby led is on all the time, you need change a couple of resistor of 10 Ohms at 2 Watts in main board. But you need disassamble a must all the amplifier. A lot of work, but cheap part.

Best regards.

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