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Hi I have a pioneer receiver QX-8000A4Cannel that needs a new four ganged potentiometer 500k ohm volume control. Where can I purchase a new one.Grateful for any info and assistance. Regards Reg

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Hi rp

You can get parts in the US direct from Pioneer. I have done a search for you and there is a parts list that mentions several vol controls. Click here

They have no stock however, and supply may be ex Japan. If you are not in the US, let me know where you are, and I will line up the correct website for you.

regards
Graeme

Posted on Apr 16, 2008

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Volume control not working how to fix it, can it work wothout volume control?


Short the volume contole pins to get full volume
Put a fixed resistor in its place
Find a similar volume control with correct resistance (in Ohms)

Visit an electronics supplier in your area to get the right part.
For Example
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Volume control not working


Left and right wires are like the ends of a carbon resistor.
The centre connection is the slider that slides along the carbon resistance.
Spray inside the device,
The centre sliders often loose connection from overuse.
Carefully take apart and clean & put slight tension back on centre slider.
Look to see if carbon track is worn out?

Take the centre wire off the Pot and try it on either end.
One will be full volume the other will be lowest volume.

Read the Ohms value of the Pot (stamped on)
or use a cheap Ohm section of MultiMeter
Note the size of threaded area
Get similar to take it's place


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Potentiometer Wikipedia the free encyclopedia

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Your problem is not with FixYa, but rather the volume control potentiometer on your Pioneer receiver. As for whether you can fix it yourself, that depends upon your ability to disassemble the receiver to gain access to the volume control and make the repair

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Is it totaly ok to just connect one pair of JBL Control 1 speakers to this receiver? Here are some of the specs. Frequency Response: 120 Hz to 20 kHz Power Capacity: 150 W Sensitivity 87 dB SPL Nominal...


The only relevant speaker spec is the impedance. As you probably realize the Pioneer SX-255R recommends 8 - 16 ohm speakers.

Four ohms is on the hairy edge of too low. You could certainly try it but if any strain or excessive volume is used you could see something go poof!

The low end of 120Hz says don't push the bass to them.

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What potentiometer is being used in rbx 374 bass volume control..because i replaced it with a500 potentiometer but still its not working..i bought yhe bass second hand,,is potentiometers for active pickups...


Yes, active use different value pots than passive. The volume control is LIKELY an "audio taper" which can be either an "A" or a "B" marking as there is confusion about the marking. The resistance is likely around 500K ohms down to as low as 50K ohms. The marking MIGHT be something like 504 B or 503 B or the same with the letter "A".

An A500 pot might be only 50 ohms... That would result in very low output. Again, the marking in the industry is not consistent.

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Try cleaning it with WD40. or some other penitrating fluid. Or just a hoover nozle. It's just dirt in the control.

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From Charles (owning a QX 949, still working but with some investment into repairs by myself) :
QX 949 contains a "power protection cirquit". This cirquit reacts aswell on short-cirquit (either within the output-amplifier cirquit {transistors} or by faulty speakers) as on overload (by playing musik toooo loud).
Your QX 949 might therefore either be affected by short-cirquit within one of the four output amplifiers or there might be a problem within the pre-amplifier or power section, causing an AC or DC signal to appear at the inputs of the output-amplifier section and therefore overloading the output, as if music was played too loud. First basic test: does the discribed "tick sound" (which means that after power-up the protection cirquit releases the relais again) also appear when the volume is turned down completely ? If not, the fault must be a signal produced within the pre-amplifier section before the volume regulation. If yes there still could be a pre-amp problem after the volume regulation but it´s more likely to be found within the output-amp section. One won´t get round to measure this section (oscilloscope) at it's signal inputs to exclude a faulty signal to arrive there. If this is not the case I would recommend to disconnect and reconnect the four output-amps from the power supply one after the other, for finding which one causes a short-cirquit. But before doing this: try out what happens if you change QX 949 into 2-channel mode by turning the socket on the rear panel. Doing this the output amps for the rear channels are deactivated. If your QX 949 was working under these conditions it would limit your further search to the amps for the rear channels.
There is also a small chance that the power-protection cirquit as such is faulty or that the power supply contains problems. The power supply has got 6 fuses that you will find underneath the bottom plate. Are they all still ok ? (If one of them is broken then there can be a positive or negative supply to the output-amps as these are receiving + and - DC-currents from the power supply)
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2 Answers

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Well here goes a spelling problem for me. You need to replace a component called a podentiomiter. It is the actual volume control behind the knob. I have had to replace a few of these, and pioneer seems to to more prone to these problems.

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