Question about Pioneer Audio Players & Recorders

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I have this pioneer receiver model VSXD608 in which when the volume goes below 20db the unit goes in protection and after some time it tries to switch on back but goes to protection again and keeps on doing this on / off i have repalced the sound op ics but the result is same as it was.

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  • Pioneer Master
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Check to see that the electrolytic capacitors that are in the output stage circuits and driver stage circuits are not high in ESR.

Check to see that the power supply is in specs. The main electrolytic caps may not be up to specs. To test the power supply it is best to run a load test on it. You will need the proper setup for this.

The supply current to the output stage may be high, and thus causing the protection to turn on. You will need to have the service manual for details.

It is also possible that the speakers are too low impedance, or their crossovers are going defective and causing a miss-match for their loading impedance.

Look with a scope to see that there are no high frequency oscillations in the output of the amp going to the speakers. A common cause of this type of fault are worn de-coupler caps in the bias circuits for the various stages along the signal path.

Check to see that there is no DC out to the speakers with any position of the volume control with no signal going in. The speakers must be disconnected for this test. Do the same with a sine-wave signal from the test generator. 1 kHz is good to use for this test. Use a proper rated 8 ohm dummy load for your amplifier when applying the test signal. Do not put steady strong tone in to your speakers. You will have to refer to the service manual to know the allowable DC offset at the output stage to the speaker terminals. Most consumer amplifiers must be less than 50 mv. The higher end amplifiers are down to less than 10 mv.

It is also good to do a distortion test to see if there is too high a distortion that is causing the protection to trip.

You can also use the dummy load and the audio generator along with the scope to do power handling tests. This gets involved to put over this type of email.

These are only some basic examples of what to check. You will need the service manual, a scope, ESR meter, DVM, audio generator, and distortion analyzer to go through all the tests to find out where the fault is.


Jerry G.


Posted on Jul 08, 2008

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Did you remember to remove the shorting link on the MA BR5 speaker terminal ..When you biwire the speakers you should remember to loosen the speaker terminal nuts and remove the shorting link plate between the HF and the LF terminals or you will short the amplifiers two channels together through the link. And modern amplifiers will take a lot of abuse at low volumes but at high volumes the protection circuit will turn off the device.

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Overheating and shutting off


Most commonly there could be a place where wires are touching from + and minus, check all wiring to the speakers. Extra speakers would create too much load, disconnect all the speakers. Check the wires and speakers by hooking one speaker at a time back up. Of course you must turn the receiver off every time you make any changes there. Add one speaker at a time.

If it's overheating it will shut off because its likely that you are asking for more then the amp can deliver. It's protecting itself. Try turning it down and gradually increasing the volume until you find the level below shutdown. If that fixes it that's all it can deliver.

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Pioneer VSX-D209 receiver shuts off when too loud


Dear Tabasco,

Your receiver is basically going into protect mode.

Just check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Take out all the wire and put them back again if necessary..
Some times even a little tiny frayed wire touching the receiver could trigger the protect mode. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.
Just check your speaker as well....whether they play all right thru another receiver or amplifier. its posiible they might be shorting inside. A little frayed wire could also trigger the protect circuit in your receiver.
I hope this should solve your problem.

If everything else seems all right and still your receiver shut down when you raise the volume then it possible that there are bad connections on the main board that are set in.

This would generally happen if the system is slighly old or have dry solder and when you raise up the volume. This should be a simple repair that will not require parts. If you can solder, you will be able to repair this yourself. If not, then a local service center will change the local labor rate.
Hope you can sort out your problem with the above trouble shooting. Let me know if I can guide you further.
Best of luck! Thanks for using FixYa!

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