Pioneer SA-6500II - Balance problem?

signsofrain · 26th April 2009, 10:18 PM

Hi all,

I have an old Pioneer SA-6500II amp, and the left channel is really soft and a bit crackly sounding. I've never repaired an amp before, but I'm handy with a soldering iron (having repaired various things before... VCRs, fluorescent lamps... game consoles... computers...) and I hope someone who's been around the block can step up and help me out.

I'm guessing that the problem is with the balance knob, fiddling with it seems to somewhat improve the problem temporarily. I opened the case, and looking inside, the balance knob is the only one mounted on the PCB with legs. (Everything else is connected by wires... damnit! Just my luck!) and it seems to be composed of two potentiometers linked with a single knob shaft.

What should I do to troubleshoot before I go to the trouble of getting the board out of there and desoldering the pot...?

The balance knob is right in the middle of the picture. Sorry for the obscured view, it's hard to get a good angle.

nigelwright7557 · 26th April 2009, 10:40 PM

The balance pot will have a value on the side of it.
Use this value to buy another one.
It is a dual potentiometer.

I wouldnt mess around cleaning it as once they are worn they are useless.

Sorry cant help with suppliers in Canada but I am sure a search will find someone who sells them.

tomtt · 26th April 2009, 11:34 PM

Quote:

Originally posted by signsofrain

I'm guessing that the problem is with the balance knob, fiddling with it seems to somewhat improve the problem temporarily.

What should I do to troubleshoot before I go to the trouble of getting the board out of there and desoldering the pot...?

clean the pot(s) first.

almost always, on these types of equipment the pot's the problem ...

`````````````````````````````````````````````````` ``````

signsofrain · 27th April 2009, 12:12 AM

I sprayed some jig-a-loo into the pot and torqued it left and right a few times. It started to feel much snappier and smoother and checks with the ohm-meter revealed it to be working correctly, so I resoldered it and lo-and-behold the amp works fine now!

Thanks tommt, I guess you've seen this before! Thanks for lending me your experience

26th April 2009, 10:18 PM	#1
signsofrain diyAudio Member Join Date: Apr 2009	Pioneer SA-6500II - Balance problem? Hi all, I have an old Pioneer SA-6500II amp, and the left channel is really soft and a bit crackly sounding. I've never repaired an amp before, but I'm handy with a soldering iron (having repaired various things before... VCRs, fluorescent lamps... game consoles... computers...) and I hope someone who's been around the block can step up and help me out. I'm guessing that the problem is with the balance knob, fiddling with it seems to somewhat improve the problem temporarily. I opened the case, and looking inside, the balance knob is the only one mounted on the PCB with legs. (Everything else is connected by wires... damnit! Just my luck!) and it seems to be composed of two potentiometers linked with a single knob shaft. What should I do to troubleshoot before I go to the trouble of getting the board out of there and desoldering the pot...? The balance knob is right in the middle of the picture. Sorry for the obscured view, it's hard to get a good angle.

26th April 2009, 10:40 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Re: Pioneer SA-6500II - Balance problem? The balance pot will have a value on the side of it. Use this value to buy another one. It is a dual potentiometer. I wouldnt mess around cleaning it as once they are worn they are useless. Sorry cant help with suppliers in Canada but I am sure a search will find someone who sells them. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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27th April 2009, 12:12 AM	#4
signsofrain diyAudio Member Join Date: Apr 2009	I sprayed some jig-a-loo into the pot and torqued it left and right a few times. It started to feel much snappier and smoother and checks with the ohm-meter revealed it to be working correctly, so I resoldered it and lo-and-behold the amp works fine now! Thanks tommt, I guess you've seen this before! Thanks for lending me your experience

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