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Becker 1492 volume control knob

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ds190's picture
Baltimore, MD
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Anyone know if this knob can be carefully removed by pulling it outward?

I'm hoping to remove the trim piece under it to spray electric contact cleaner in there.

Thanks, Dave

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davegt's picture
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Re: Becker 1492 volume control knob

Yes, it just pulls off and pushes back on.

What is the issue, the volume not working properly?

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ds190's picture
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Re: Becker 1492 volume control knob

The volume does not increase gradually as one turns it up- it stays low as you click the knob, and then suddenly is much louder. Also, the balance is intermittantly uneven, and if you adjust the knob clockwise and counterclockwise, balance returns to even.

I’m going to spray electrical contact cleaner into the pot to see if it makes any difference in its erratic behavior. I’m trying to avoid sending it back to Becker for repair.

We know that this radio has a speed dependant volume adjustment (radio adjusts itself louder at higher speeds., and vice versa). I’ve had experience with two other 1492s in two other E300s, and those radios worked as they should (the volume would increase linearly as one turned up the volume).

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Re: Becker 1492 volume control knob

So, let us know how it works as the volume of ours does not linearly increase manually. I did not know it would increase/decrease based on speed. Interesting...

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Re: Becker 1492 volume control knob

Yes..let us know. My 95 E420 radio is doing the same thing, and I have never heard of the speed dependant volume, I have never really noticed it either. Let us know what product you used also please.

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ds190's picture
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Wrong info speed dependant volume

My mistake- the 1492 Becker radio does NOT have the speed dependant feature.

The 1432 Becker does.

SorryBow down

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ds190's picture
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Re: Becker 1492 volume control knob

I just noticed this forum is sponsored by Becker Autosound.

Nothing personal Ed about not wanting to send it to BA- I just don't want to pull that radio. It's already been up to you for the aux in modification (excellent!), and I've already pulled the cable through the center console under the console wood and into the console box. I don't want to pull it out;)

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Re: Becker 1492 volume control knob

ds190;185995 wrote:
I just noticed this forum is sponsored by Becker Autosound.

Since the forums here are not supported by commercial interests, would you kindly explain what you mean by this statement, and how you arrived at your understanding? I might then learn something I didn't know.

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ds190's picture
Baltimore, MD
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1984 190D
1991 300TE
1993 300CE
1995 E300 Diesel
Re: Becker 1492 volume control knob

Well, the sticky up top says "This forum was created to allow the experts from Becker AutoSound to help you solve any radio-related issues you may encounter".

On checking the thesaris, it would have been better for me to have said "support" instead of "sponsor".

I have sprayed the stem of the volume control with Chemtronics Kontact Restorer, but it's not likely much got in. There is 30" of Baltimore snow around my garage, another 15-20" is on the way tonight, so I won't be getting to the E300 to put the faceplate back on and check function for a while.

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Edward Ebel's picture
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Re: Becker 1492 volume control knob

Gents,

The volume controls that you are describing were introduced in 1994, starting with the 1492 model. It is not a traditional volume control as we were familiar with in years before. It is known as an "increment sender". It is a micro-switch that rotates and has mini fingers that contact onto a special metal conductive pad. The sender sences the rotation and sends a pulse to the respective circuit. Many of these earlier switches had an inherent fault. This problem was corrected in later version switches. The contact area is not open to the air, preventing dust from getting inside. If we know anything about experiences with "contact cleaner", we definately know that it tends to collect dust and dirt (due to the residue it leaves behind) and usually makes the problem worse in the long run. Ultimately, the best way to fix it is to replace the control. Yes, I know that is inconvenient, however it is the permanent fix!

Have a great day.

Ed

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Re: Becker 1492 volume control knob

Edward Ebel;186061 wrote:
Gents,

The volume controls that you are describing were introduced in 1994, starting with the 1492 model. It is not a traditional volume control as we were familiar with in years before. It is known as an "increment sender". It is a micro-switch that rotates and has mini fingers that contact onto a special metal conductive pad. The sender sences the rotation and sends a pulse to the respective circuit. Many of these earlier switches had an inherent fault. This problem was corrected in later version switches. The contact area is not open to the air, preventing dust from getting inside. If we know anything about experiences with "contact cleaner", we definately know that it tends to collect dust and dirt (due to the residue it leaves behind) and usually makes the problem worse in the long run. Ultimately, the best way to fix it is to replace the control. Yes, I know that is inconvenient, however it is the permanent fix!

Have a great day.

Ed

That's cool...makes sense. Ed...what does it cost to have the control replaced? Is it more than just the knob?:confused:

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Wayne Halvarson's picture
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Re: Becker 1492 volume control knob

I replaced this part in a BE1692 radio for my 1997 S320.
I don't know if it's exactly the same part but the picture looks similar.
It was relativley easy to do with a small soldering iron.
The part from Becker North America was a 1155.466-385 Encoder Switch,
$10.05 in 2005.

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Edward Ebel's picture
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Re: Becker 1492 volume control knob

When we receive these radio models in for a full recondition, we automatically change this part (and the knob) as part of the repair. Contact me off line and we can discuss your options. Generally I do not recommend this as a DIY project since most people dont have the equipment and tend to damage other things in the process and then it turns into a more serious repair.

Ed

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