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I have a Pioneer VSX-D912 Receiver. All of a sudden his evening, the unit starts overloading and shutting down. This only happens when choosing dvd option or cd. When using cable option, everything fine. I run the sound from the cable thru speakers same as dvd. have had set up same way for a while. What could be causing this possibly??

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If the problem only occurs with some inputs, not with others,
it is most likely that you have a severe "hum" problem on
the input cables.

A large amount of hum (or feedback oscillation) on any input
may cause a critical condition on the output due to distortion.
Because this condition can blow the amplifier, as well as the
speakers, not to mention that it can damage your ears, a smart
(modern) receiver may trip a safety circuit when this happens
and turn itself off.

One of the problems with over-loading an input with hum or
an out of control oscillation, is that the rogue signal is amplified,
causing the output amplifier to clip the peaks of the resulting
waveform. The clipped peaks (in turn) contain intense high
frequency harmonics, whose energy can exceed the normal
operation parameters by several orders of magnitude
(from Fourier Transform Theory)

These high energy harmonics will barrel through a normal
speaker's frequency cross-over network, causing the speaker
(tweeters) to blow, damage to the amplifier and/or cause
extreme hearing pain.

For this reason overload protection is a good idea.

1) When troubleshooting this problem, always start at a very
low volume and turn it up very, very slowly. Ware hearing
protection at first, if you are not sure what to expect.

2) Listen for any objectionable noise, hum, roar, whistle....

3) Check the grounding on the offending input cables.

4) Unplug the offending device from the input, and check
if the problem persists, in which case the receiver is defective,
or if it does not, then the input device is at fault.

5) If you have a digital DC voltmeter, check that no DC voltage
is present at the output of the offending input device.

6) Clearly if the problem occurs only with some inputs,
then it is caused by:

a) The input device such as the CD player
b) The connecting audio cable
c) The receiver input jack (ie grounding)
d) The receiver's input pre-amp (internal)
e) The receiver's internal switching.

The problem can also be caused by a faulty power-supply
or line isolation within the input device (such as the CD player)

Any problem beyond this stage, such as a defective final
amplifier, shorted speaker wires, etc....
would cause symptoms regardless of which input you selected,
which you said is NOT the case.

Hope this helps, Martin

Posted on May 22, 2008

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Try this before you do anything else. Swap the inputs around at the receiver. important that you do it a the receiver, not at the devices. So you wind up with the cd\dvd player in the cable input and the cable input in the cd input. Do have the same problem????? If yes at least we've isolated the problem to the the cd player or it's cable so the easiest thing to do is to change the cable

If no, and the problem is the cable now, it's within the receiver.

Come back witht the answers.....

Posted on May 12, 2008

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I have same model pinoneer the manual states one of several things here

sometimes when moving unit loose strands of speaker wire get caught inside speaker panel insert please clean our and wear a static guard ground velcro wire attached around arm with wire attached to sterio this keeps static from zapping your receiver

Make sure there are no loose strands of speaker wire touching the
rear panel. This could cause the receiver to shut off automatically.
• If the STANDBY indicator blinks and the power shuts off
automatically, take the unit to your nearest Pioneer authorized
service center or your dealer for servicing.

When a search is performed
by a DTS compatible CD
player during playback, noise
is output.
• This is not a malfunction, but be sure to turn the volume down to
prevent the output of loud noise from your speakers

• If the unit does not operate normally due to external effects such as static electricity disconnect
the power plug from the outlet and insert again to return to normal operating conditions.
Resetting the main unit
Use this procedure to reset all the receiver’s settings to the factory default. Use the front panel
controls to do this.
1 Switch the receiver on.
2 While holding down the TONE button, press and hold the
 STANDBY/ON button
for about three seconds.
3 When you see RESET? appear in the display, press the TONE button.
shows in the display.
4 Press TONE once more to confirm.
appears in the display to indicate that the receiver has been reset to the factory default

these are the most technical explainations that this system gives

Posted on May 12, 2008

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If the Cable works fine, and the DVD does not, then the Receiver is most likely not overloading and shutting down. You don't mention how your DVD is connected, but I'm going to guess it's with a fiber optic cable. In that case there's a very high likelihood that the cable is either not seated properly or the fiber optic transmitter in the DVD is intermettent.

Start by removing the fiber optic cable from the DVD and Receiver and switching ends. Use little compressed air in the connectors to blow out any dust. Do not use "lung-power", as the moisture could cause problems. Sometimes the laser connections just line up better, especially with inexpensive cables. If that doesn't help, try another fiber cable. Since they are glass fiber, they are subject to crushing and cracking from being kinked or bent too sharply

If that doesn't work, try the coax digital connection or analog audio connection between DVD and Receiver.

If you are not using the fiber connection, use the same logic: switch to another set of outputs from the DVD, and another set of inputs on the receiver.

My money is on a bad audio cable first, a bad transmitter in the DVD player second and a bad receiver a distant third option.

Posted on May 12, 2008

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Pioneer posted this on it's Canadian Web Site:

Poor wiring connections, bad wires or a bad speaker may cause this. As you increase the volume, you will increase the amount of current you are drawing from the receiver. To troubleshoot this issue, try the following:
  1. Disconnect each speaker wire connection. Inspect for any frayed or damaged wiring and replace it.
  2. Check the impedance of the speakers; make sure they are properly rated for your stereo. In most cases, they need to be 8 ohms. Only a few Pioneer receivers will support lower impedance.
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    1. Turn the receiver off.
    2. Remove one speaker.
    3. Turn the receiver on.
    4. Increase the volume.
If the receiver overloads, repeat steps 1-4 (selecting a different speaker each time). If you disconnect a certain speaker and the receiver no longer overloads, have this speaker checked at a service center. It could have a bad speaker component, like a tweeter, sub-woofer, or even a bad crossover.

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