Help me please, potentiometer problem

[KMossman]

WD-40 will [?] soften the binder

KMossman
Yikes!
in my experience WD-40 will soften the binder that holds the carbon in the potentiometer track in place allowing them to wear prematurely!
the only time i would suggest using wd on a pot is to try and free up a shaft that's frozen in place or extremely stiff never on the carbon track.

perhaps I was clear enough

AFTER using contact cleaner, if the pot is still a problem, THEN try WD-40

I am NOT suggesting spraying WD-40 willy-nilly.

IF at that point, it did soften the binder (destroy the pot), who cares...it was already a lost cause.


and in 10 years I had yet to destroy a pot using WD-40, however I have noticed that I have to 'move' the pot a little slowly else the noise comes back - though it disappears when I go back to 'moving' it slowly.

It is a last ditch effort. It has worked several times for me...............

 

[KMossman]

genco
have you had a chance to measure if there's any DC across the control?
i still think you may have capacitor troubles.

That can be a cause, IF the DC is significant.

I have had to 'correct' some amps that had problem (no blocking cap, and a poor design were the causes).

 

[turk 182]

any presence of DC even as small as1/2 a volt on a volume control should be investigated as it's not supposed to be there.

 

[KMossman]

I agree - usually there should be no DC on a volume control, but isn't the current the major concern?

ie

0.5V at 100mA is a disaster

0.5V at 100picoAmps is curious

 

[bfp]

Hi gencogenco,
I am trying as well to solve a potentiometer issue like you are trying here. Did you solved it ? In the same time there might be a little off topic but I would like to know your symptom details since there are not stated in the begining post.

 

[mprivitera1]

thank you for answers I love you my friends I found the wiring diagram 5pcs Alps Genuine Motorized Potentiometer 100K RK168 Audio | eBay

An externally hosted image should be here but it was not working when we last tested it.

Hi guys I bought this....ALPS RK16812MG 2-fach Motorpotentiometer log. o linear 10K oder 100K Poti | eBay ... But I can not make it work, I applied this scheme, but the pot at work, while pot B, remains fixed on the 100k does not change by turning ... ..a few do not understand can help

 

[AndrewT]

The Left input cable goes to J2 and J6
The Right input cable goes to J3 and J6
The Left output cable comes from J7 and J6
The Right output cable comes from J5 and J6

That is 8 wires that need to be connected.

 

[mprivitera1]

The Left input cable goes to J2 and J6
The Right input cable goes to J3 and J6
The Left output cable comes from J7 and J6
The Right output cable comes from J5 and J6

That is 8 wires that need to be connected.

thanks for your help now more clear .... the pattern is seen from under the pot? .. Figure

 

[mprivitera1]

sorry ... but B & A loud ... what I have to connect them ??

 

[picowallspeaker]

To the loudness contour RC net ( the loudness button - if you don't have it, don't connect them )

 

[mprivitera1]

I made these links ... a canal works, the other ... No I do not understand ..what missing something?