Question about Pioneer VSX-305 Receiver

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Won't power up; push power button on, hear click in back left of unti, get nothing on front display and no output from speakers; as if unit trying to operate

Pioneer vsx-305 has a light buzzing sound, coming from speakers i believe, for a few years now. still puts out good sound. now i hit power button, i hear a clicking in the back left, but it won't power up to allow functions to work (radio, cd). also, the main display does not come on either showing radio channel or other function in use. my wife says she turned the unit on the shelf to see if speakers were attached to play some tunes and then it wouldn't turn on properly. now i see where it doesn't power up. red standby light on power button does disappear when I click power on, but i hear the click in the back and get nothing. unit about 8 years old.

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Disconnect the speakers and see what happens. Carefully examine the speaker cables for unwanted connections (shorts).
Take a clue from when the power problem appeared. Something was moved and made the buzz a (probable) dead short.

Posted on May 16, 2009

  • Martin Gowers
    Martin Gowers Jul 25, 2014

    Sounds to me that it has got a power supply fault the buzz was probably a component starting to fail this will probably be only a resistor on the power supply there are normally four the same so replace them all at the same time as they only cost a few pence

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Alright as odd as this solution may sound its worth the 5 seconds it would take to try it. My exact model receiver ran into the same problem. Standing the unit up on end on its left side restored power to the unit and it started functioning fully again. To the best of my searching and many hours poking around inside the unit it appears to be a connection problem with two of the larger capacitors inside the unit.

Posted on Jan 23, 2012

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Posted on Jan 02, 2017

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I have a Sony TA-AX 301..powers up fine.. and can


Make sure your speakers are the correct impedance for the amp. They should be 8 Ohm.

Connect them to the Speakers A sockets on the back of the amp.

Set the Speaker selector switch on the amp's front to Speaker A

Connect your source as detailed in the other answers.

Set the graphic EQ to either Off or Flat or put all the sliders to the middle position.

Apart from setting the volume on the amp, that should be it. If there's still no sound then you should recheck your wiring and input selection (make sure the red & white are connected to an IN and not and OUT on the amp). KIf there's still no sound then either the speakers or the amp (or both) have a fault.

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When push the power button, I can hear a relay click but the unit will not power up. I took the cover off and fuses are good. Can't find anything in the trouble shooting section of the manual. What do you...


When the unit functions correctly, you should hear 2 clicks. The first is the power relay that "starts" the unit. The second is the speaker protection relay that will kick in the speaker connection. If you do not hear the second click, the unit is in protect mode. This means that a problem was detected in the amp section and the unit is prevented from connecting the speakers. This is done to prevent further damage. Typically the output transistors fail and cause this. Expect a parts cost in the $25-$50 range for this repair.

Dan

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I don't get any front display or any sound when turned on.


Do you hear any clicks? If not, the standby transformer or related circuitry is bad. If you hear 1 relay click...the audio output section is most likely the problem. The first click you hear is the main power relay...and should see display.. the second relay click is the protection circuit relay engaging to let audio to your speakers...if the second click is not heard (it should occur in 3 to 5 seconds) there are shorted output transistors or a shorted output IC trying to blow your speakers with 50 to 75 volts dc. The protection circuit monitors the speaker lines for voltage. They should always read milli-volts only...not even 1 volt.Anyway, good luck

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No audio output


Were you playing it very loudly when it died?

The manual is here for reference...

http://www.docs.sony.com/reflib/docget.asp?manualid=11654&template_id=1&region_id=1&DL=',600,560,10,10,'Manuals'

It discusses troubleshooting this problem on page 50.

When you turn the receiver ON does you hear a light click in about 5 seconds? That would be the protection circuitry turning OFF to allow the amplifiers to function. The delay is to allow the circuitry to stabilize before it sends any output to the speakers. If you don't hear a click the unit is Protecting the speakers due to malfunction somewhere.

If no click and no apparent messages try turning the speakers OFF using the Speakers button directly below the Power button (1/0). This will eliminate or point to external shorts as the cause.


Does the unit click after 5 seconds of Power ON with the speakers OFF? Isolate your shorted speaker or wire problem.


Still no sound at the speakers when you turn them ON?

We need to establish if there is any programming flowing through the receiver.

A quick basic check would be to tune an FM station, if you have a tape deck attached, place it in Record or Record/Pause mode so it can display the input signal levels. You should see the record meters fluctuating with the level of the program selected. If you don’t have a tape deck, run an RCA cable pair from the audio output for a tape deck to an analog audio input on your TV. Select that input on the TV and you should hear the FM station, or anything the receiver is configured to play. If it's silent then there is no audio signal circulating in the receiver to get out to the amplifiers.

If you hear the program on the TV but not through any attached speakers, then the amplifiers are all disabled for some reason.

If there is no audio flowing through the receiver the problem could be a switch in the wrong position, source not selected, muting on or a multitude of other things.

Let me know how this turns out.

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2 Answers

Speakers A Off


Good news. This doesn't mean that anything is (necessarily) broken.

In the middle of the remote, there is an [ENTER] button surrounded by arrow keys. To the top, left of this of this arrangement, there is another button labeled "SP A/B". Turn your system on (and check that the volume isn't maxed out from your troubleshooting) and hit this button. Look for the display to say "Speakers A" or perhaps "Zone A" or similar. You will probably hear audio before you get this far.

If you are still having problems with this, try changing your speaker connections in the back. Attach your two main speakers (Front L/R) to the connections for "Speakers B" (the springed, push down, bare wire connection at the bottom, right). This is just for testing output via Speakers B. If this is as far as you get, respond with more information on your experience.

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I upgraded my HK AVR 20II and ran into the same problem when I tried to hook the old unit up out in my garage.

Luckily I remember that on the rear there is a pre-out RCA port (L/R) and a Main-In port that are intended to be to/from an equalizer/amplifier. These come jumpered out of the box, but I had been using an equalizer so the jumpers were long lost.

Assuming you also have no amp/eq you are using, just connect the Pre-Out to the Main-In using a standard M/M RCA cable and you will be in business. (turn the volume down first!)

Good luck.

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you may have a dc condition present on speaker outputs. this could be caused by dry solder joints, suggest blanket resolder of the output stages for front channels.

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Won't Power On...


Hello degaff, This is what I would do to try to determine the problem: 1. Disconnect everything from the receiver. The only thing connected should be the power cord. Make sure the power cord is disconnected from power for at least 30 minutes in order to reset the internal electronic software. 2. Then, power it up - still nothing else connected. If it powers up normally and "looks" like it is going to work, then turn it off and connect only the right speaker to its amplifier and try again. If it still looks normal, then turn it off and connect the DVD or CD player and run some music through that speaker. If it still looks normal, then shut it off and connect the left speaker, etc... In other words go one-by-one in checking it out. 3. If it does NOT power up after step ONE, then there is a problem internally. If it powers up only to shut down again, there is still a hardware problem internally. The usual cause is shorted output transistors. And the normal cause of shorted outputs is a short on the speaker line, a short inside one of the speakers or overdriving the amplifier for too long a period of time. If the outputs need replaced, then it will cost an arm and a leg to get them repaired, and you are better off replacing the unit. The clicking sound, by the way, is the power relay which turns the power transformer on. And if there are faults in the amp, speakers or wiring, the protection circuit shuts the relay off; that is the clicking sound you hear. Please let us know how this works, and if we can help you any further. Best regards, nightdiver

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