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Old 12th January 2013, 04:07 PM   #1
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Unhappy Help me please, potentiometer problem

i have denon pma1500r . i have volume potantiometer problems.
I buy new potantiometer alps kb100x2

old potantiometer : 30kbx2 alps

how connection new potansiometer??

new potantiometer and old potantiometer are different pins.

how connection new potansiometer??

Help me please .

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Old 12th January 2013, 05:42 PM   #2
TheGimp is offline TheGimp  United States
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I suggest you search for a service manual for the denon pma1500r first. Once you have that you can find the pinout of the volume control in it.

You will also have to find the pinout of the replacement alps kb100x2 unit, or trace out on the PWB.

Once you have both pieces of information it will be possible to determine how to replace the unit.
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Old 12th January 2013, 06:17 PM   #3
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Hi Gencogenco, welcome to the forum.


Have you the skill to remove the old potentiometer?

If so get the correct replacement part.

The new one wont fit.


What exactly are your potentiometer problems ?
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Old 12th January 2013, 08:16 PM   #4
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Quote:
Originally Posted by Soonerorlater View Post
Hi Gencogenco, welcome to the forum.


Have you the skill to remove the old potentiometer?

If so get the correct replacement part.

The new one wont fit.


What exactly are your potentiometer problems ?
thank you for answer

The problems are balance (right-left imbalance in low-volume ) and sizzle, hoarseness. i can remove old potentiometer but i cannot attach new potentiometer.

Quote:
Originally Posted by TheGimp View Post
I suggest you search for a service manual for the denon pma1500r first. Once you have that you can find the pinout of the volume control in it.

You will also have to find the pinout of the replacement alps kb100x2 unit, or trace out on the PWB.

Once you have both pieces of information it will be possible to determine how to replace the unit.
ok thank you
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Old 12th January 2013, 08:41 PM   #5
kevinkr is offline kevinkr  United States
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Wrong forum, moving to solid state..
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Old 12th January 2013, 09:12 PM   #6
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Have you tried cleaning the potentiometer with an electrical contacts cleaning spray such as Deoxit.
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Old 12th January 2013, 09:15 PM   #7
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Quote:
Originally Posted by Soonerorlater View Post
Have you tried cleaning the potentiometer with an electrical contacts cleaning spray such as Deoxit.
i cleaning with contacts spray but does not work
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Old 12th January 2013, 11:05 PM   #8
dheming is offline dheming  United States
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The pins are in a different physical configuration on that replacement pot you bought. It would be really difficult to adapt it using jumper wires in the amount of space you have underneath.

Maybe something more like this style motorized alps pot would work. You'd have to verify that the pinouts are the same of course though.
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Old 12th January 2013, 11:38 PM   #9
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Alternatively,

Could the pot be separated from the motor casing ? You might get lucky, that might be an easy got hold of standard 30k pot.
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Old 13th January 2013, 11:00 AM   #10
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There are two problems with no easy solution unless the original design is fitted.
The original has dual, front and back, 4-wire tapped pots to suit a loudness control.
The replacement has all pins in a single row, including the motor connections, I believe.
Common ALPS parts are often only 3-wire, untapped. These can be made to work, just
losing the loudness control. Some amplifiers may still need a circuit mod. to work properly.

You won't be able to simply fit your replacement without a major rebuild of the pot, PCB or both.
The only simple substitution is to follow the method of post 2, using a potentiometer diagram
to guide your measurements to determine which connections match up.
Then make wire links
to the PCB, bending the pot. pins flat so they can press against the PCB with some insulating
board or plastic separating them.

Take care avoiding motor leads close to audio signal leads. This is definitely not an easy
job for anyone without at least basic mechanical assembly and wiring skills.

Needless to say, I would not try this unless it was the only amplifier and that was the only
pot. on the planet. Sometimes you have to take your mistakes in ordering parts as a lesson -
a hard lesson for sure, but we all make mistakes ordering parts without enough information.
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