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Servicing Potentiometer volume pots


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#1 hopey

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Posted 20 December 2017 - 04:20 AM

Here is an alternative to using contact cleaners on potentiometers. This way ensures you have removed the gunk and corrosion due to age.

I had an Aiwa mini box that would drop a channel at low to mid volume. At full volume both channels worked fine.

Once the box was dismantled I identified the volume pot. This is the easiest design to work on and very common.

Using A small flat screw driver I bent back the four retaining tabs.

The top section will separate with the contact plate attached.

The pcb with the carbon tracks remains attached to the main board.

Clean all surfaces gently and apply a non conductive grease. I use silicone.

Reassemble the top and bend back the retaining tabs. Ensure you compress the tabs with plyers so you get good pressure on the contacts and pcb.

You should now have a smooth and fully functioning volume pot.

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#2 duckrock

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Posted 29 December 2017 - 03:07 PM

Hey, thanks, I have a slider volume control on a PC-5 JVC and I will try this!  Not sure if/how the slider complicates things, here are photos.

https://drive.google...e8DEU9VF1IRXY4b

duck



#3 docs

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Posted 29 December 2017 - 03:56 PM

Had to do a few myself, fixing broken connections using conductive liquid. Sometimes, it’s the only way.

#4 hopey

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Posted 02 January 2018 - 02:15 AM

This is the best way to ensure your pre amp signal is strong and clean. This can be the reason why two identical boxes sound very different.

The sliding pots work the same way but you will have to sweat it off the main board first.