It is likely failing due to age.Cold solders fail, corrosion can cut a connection, a capacitor can harden and fail... a myriad of things can happen in time. Repairing it will cost more than an inexpensive replacement. The same receiver can be had on ebay from $60 up (with shipping). It is a cost benefit issue at this point.
SOURCE: Pioneer VSX-D412 AMP-ERR message.
Hello,
The AMP-ERR message in many Pioneer Receivers is caused by some DC in the output. The microprocessor then issues the warning and shuts the unit off. It is definitely not a relay switch. It could be the amplifier power pack, i.e. PAC011A or similar that is faulty or something else. Not easy to repair for the non- experienced DIY.
Good luck
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.
SOURCE: Pioneer VSX-918V-K Standby Light Flashes but will not turn on.
unplug it and press the power buton and then hold the power button, and while your holding the power button, plug it back in
hope it worked!!!
SOURCE: I have a VSX-918V Pioneer
Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on. Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up. You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it. If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good. If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
SOURCE: I have an older Pioneer vsx-403 receiver that
I have the same problem. I have taken off the top cover and you will see a tiny glass fuse which looks good, but I change it and then it powers up but only for a while. weird. I can hold the power button down while I unplug the power cord from the rear and plug it back in some times it takes a few times before it comes back on. Looking for a permanent fix
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 into standby.
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 ENTER .
OK? shows in the display.
4 Press SYSTEM SETUP to confirm.
OK appears in the display to indicate that the receiver has been reset to the factory default
settings.
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