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Old 13th January 2013, 11:11 AM   #11
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Also the loudness function will be altered when replacing a 30K pot with a 100K.
You should al least find a 50K to replace the original.

Also, try to clean up the existing potmeter.
If there is just nise as scratching and so when operating the potmeter,
you should be good i using a good electronics cleaner with lubricant .
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Old 13th January 2013, 12:54 PM   #12
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thank you for answers I love you my friends I found the wiring diagram 5pcs Alps Genuine Motorized Potentiometer 100K RK168 Audio | eBay
Click the image to open in full size.

Last edited by gencogenco; 13th January 2013 at 01:12 PM.
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Old 13th January 2013, 01:22 PM   #13
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if this control is noisy and cleaning doesn't help it may be leaky interstage caps
is there any dc on the pot?
to me the clue is the "sizzle" and "volume difference

Last edited by turk 182; 13th January 2013 at 01:27 PM.
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Old 13th January 2013, 10:49 PM   #14
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gencogenco
i'll assume you have a reasonable multimeter available to see if any dc voltage is present on the potentiometer as well as check dc levels in general before and after the control's position.
let me know what you find
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Old 13th January 2013, 11:13 PM   #15
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Default then try WD-40...........often works for me

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Originally Posted by gencogenco View Post
i cleaning with contacts spray but does not work
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Old 13th January 2013, 11:39 PM   #16
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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.
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Old 14th January 2013, 04:57 AM   #17
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If u don't find the 30 K pot, then fix four parallel resistors to lower the resistance. U have to connect each across loud terminal and other ends.

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Old 15th January 2013, 01:14 AM   #18
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hi friends,
connected new potentiometer. everything is normal. but only very little sound coming off the pot is new pot defective i wonder??
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Old 15th January 2013, 01:58 AM   #19
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Well, everything can't be normal if you have very little output. Try temporarily removing the loudness tap connection on one channel. If normal volume is restored, you will need to lose it as a feature or redesign the circuit to suit the new high value (100K) pot.

If this doesn't restore volume, your connections will be incorrect. It is unlikely the pot. is defective in both channels but if you have even a cheap multimeter, you can measure that a resistor is a resistor or a variable one, anytime.

Note that the source/direct switch also grounds the tapping via 3.6k (disables it) in the on position.
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Last edited by Ian Finch; 15th January 2013 at 02:24 AM.
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Old 25th January 2013, 09:22 PM   #20
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genco
have you had a chance to measure if there's any DC across the control?
i still think you may have capacitor troubles.
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