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Hi my pioneer SU-X950's volume keep going up and down on its own! help Thanx carl

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Loose connection or cold solder and cleaning problem this is the main caused..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Don't forget to rate;

Posted on Jul 22, 2008

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I had a receiver that would shut off when I had the volume too loud. It was caused because the speakers were using too much juice. Does it work with less speakers or at low low volumes? Then this may be the case.

I solved it by getting a different receiver.

if it has nothing to do with volume then check your manual and settings for a auto standby feature that may be just putting the receiver to standby after a set time.

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I've got a vsx-920-k Pioneer receiver with s-11 Pioneer speakers and a s-21w Pioneer subwoofer. All of a sudden my sub stopped working and it seems like it's stuck in standby mode (blue light...


The manual is here...

http://www.pioneerprodj.eu/eur/products/42/99/S-21W/media.html

Flashing Blue is not defined in the manual.

Have you tried changing the Auto Standby switch to ON?

You can prove if the sub amp will respond to a known good input by TURNING ITS VOLUME DOWN tp start and just feeding it ANY RCA output from the receiver while playing, say, FM (to keep it simple). That way you would known in which direction the problem actually lies (internal or external).

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I have Wharfdale 4000 Xarus speakers connected to my Pioneer VSX 817, the last 6 months it keeps saying overload when i have the volume further than 40db. Never use to do it... and i have re wired the...


Testing your amp at max with the speakers disconnected will not play a factor because there is no power being drawn so the amp is not being used. Those speakers are rated 90db and really pound but also draw a ton of amps. The key thing here is to keep it cool, cool, cool. Put a fan on it and keep your receiver on a hard surface with nothing stacked on top or anywhere within a foot of it. Keeping it cool will help prevent overloads or (protection mode). Back it down every now and them and give the system a rest for a few minutes. Double check the negative and positive connection on the speakers to the receiver. We all have hooked them up backwards sometime and this will have the effect you are expressing. What is the phase set at on your receiver? Set it down to "0" and go up to where it sounds best without distortion. One more very important thing. What is the Ohm switch on your receiver set at? Put the switch on 8 Ohm even though your running 6 Ohm speakers. That switch only steps down your voltage feed to the power selections which will hamper the overall dynamics and fidelity of your receiver. This switch is really not even necessary. Putting that switch at 8 Ohms will give you more headway and aid in keeping your amp cool.
Regards, Tony

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You would then connect the EQ between the chosen Line Out and the amp input. If you had a Pre-Our you would just run speaker assignment, levels, etc and have fun. With a Line Out feed you will have to ride herd on the 901 volume via its dedicated amp controls. Bummer. My older VSX-36TX allows me to have the right setup.

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This type of calibartion is known as a logarithmic scale.
The numbers refer to decibels below the maximum output of the amplifier section of the reciever, or decibels of attenuation (making smaller/quieter).

Without going through logarithim theorey, the logarithim (base 10) of 1 is 0. So if 1 is the maximum output of the amp, as you turn the knob down from maximum you are adding more and more attentuation to the output (relative to maximum) and so the loudness of what you hear goes down, even though the number on the scale is going up !

Most peolpe associate decibels with sound levels, but anything can be measured in decibels, so long as there is soemthing to reference it against.

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http://parts.pioneerelectronics.com/model.asp?modelNum=VSXD498

Part number asx7004

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