Becker Radio Volume Control - Mercedes-Benz Forum
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post #1 of 22 (permalink) Old 02-04-2013, 12:00 PM Thread Starter
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Becker Radio Volume Control

I believe I have found the encoder! I have ordered one from Mouser and will let everyone know when it arrives and I get it installed. It was $1.69 plus $5 shipping.

Mouser #: 858-EN11-HSB1AQ15
Mfr. #: EN11-HSB1AQ15
Desc.: Encoders 11mm Rotary Incremental Encoder
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post #2 of 22 (permalink) Old 02-04-2013, 01:58 PM
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Hey daddy,

Great find, If you do not mined, snap a few pictures of the part when it arrives, and post them here.

Thank you,

Martin
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post #3 of 22 (permalink) Old 02-09-2013, 02:23 PM
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Was looking around the forum and found a thread about squirting some contact cleaner into the volume control. It works. Got it at oriellys for $8

Pull the knob off. pull the plate that covers the volume control from the bottom. (did it with my fingernail. came right off). Spray some contact cleaner between the volume shaft and the body and turn the knob. place a paper towel under the shaft for drips. Do a couple of times and the volume is like new!

Took about 30 seconds
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post #4 of 22 (permalink) Old 02-09-2013, 03:40 PM
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Quote:
Originally Posted by IMHuge View Post
Was looking around the forum and found a thread about squirting some contact cleaner into the volume control. It works. Got it at oriellys for $8

Pull the knob off. pull the plate that covers the volume control from the bottom. (did it with my fingernail. came right off). Spray some contact cleaner between the volume shaft and the body and turn the knob. place a paper towel under the shaft for drips. Do a couple of times and the volume is like new!

Took about 30 seconds
I have some CRC electric cleaner laying around...I wanna try this out. Unplugging the battery as a precaution. Thanks for the tip.
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post #5 of 22 (permalink) Old 02-09-2013, 09:16 PM
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Quote:
Originally Posted by IMHuge View Post
Was looking around the forum and found a thread about squirting some contact cleaner into the volume control. It works. Got it at oriellys for $8

Pull the knob off. pull the plate that covers the volume control from the bottom. (did it with my fingernail. came right off). Spray some contact cleaner between the volume shaft and the body and turn the knob. place a paper towel under the shaft for drips. Do a couple of times and the volume is like new!

Took about 30 seconds
yes, this works, but for me it was only temporary. a few months later it's back to it's old ways. I think a new encoder is probably the only sure fire solution.


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--------His------------Hers-------

97 SL500 Imperial Red
/Parchment Leather/Black Top


Chromed OEM wheels, Akebono's, H1+90 fog, Burlwood/Leather shift knob, Rostra Lumbar support, Check seat heaters, Bilstein's, Parrot Bluetooth, GG Bailey Custom cargo mat, GG Bailey trunk mat, Real Burlwood Instrument Cluster w Chrome rings, Burlwood & Chrome shift surround, Euro headlights with Osram 70W/65W H-4's, clear corners, Silverstar corner lamps, Euro Trunk mount Warning triangle, SL600 Burlwood armrest trim & Burlwood cupholder sliding cover, Kahtec flashing third brake light (CHMSL)


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post #6 of 22 (permalink) Old 02-24-2013, 07:09 PM Thread Starter
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It WORKS!

Finally got around to installing this and glad to say it works!

However, a couple things not ideal.

First, the shaft is 5 mm too long so the volume knob sticks out 5 mm more. This could be easily taken care of with a dremel.

Second, the volume works backwards. I will live with this but there may be a solution (although I'm not going to investigate signal "A" vs "B" lag/lead re-wiring at this time).

With that said, an ideal part number, if it existed, would be;

EN11-HSB3AQ10

per spec sheet;

http://www.mouser.com/ds/2/414/en11-6592.pdf

This would change the cw/ccw volume adjust and decrease shaft length by 5 mm.

I'm going to live with it because it works just fine changing the volume. But if I was to do it again, I might cut the shaft and figure out changing the "A" and "B" signal...which shouldn't be hard at all really...just not worth my time atm

Here's some pics. Removing the radio is explained else where and not covered. Soldering skills are also not covered.

Ok, first here is the new and old (removed) encoder.



The top cover of the radio is just snapped in place, so just pop it off (no picture).

You have to significantly loosen this screw (red circled) on the bottom as it secures a ground spade lug to the front panel circuit board.





ATTENTION CARE MUST BE TAKING WHEN RE-INSTALLING THE FRONT PANEL TO MAKE SURE THE GROUND LUG IS SANDWICHED BETWEEN THE CASE AND FRAME.



Here is the front panel removed. It snaps in/out once the top cover is removed and bottom chassis screw is loosened. You then must remove the 3 torx screws and twist the mechanical tabs (circled red). The 7 black circles are the encoder which must be desoldered. Note the ground lug bottom middle I mentioned earlier.




New encoder installed.



ATTENTION CARE MUST BE TAKING WHEN RE-INSTALLING THE FRONT PANEL TO MAKE SURE THE GROUND LUG IS SANDWICHED BETWEEN THE CASE AND FRAME.

A very easy job actually and would be perfect if the exact encoder can be found. Hopefully this will help others and maybe someone can find the exact replacement.

Now to find a knob........(becker doesn't have them anymore and $35 on ebay!)

Last edited by ddaddy; 02-24-2013 at 07:34 PM.
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post #7 of 22 (permalink) Old 02-25-2013, 07:45 AM
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Daddy,

Thank you for the pictures. and the notes on it.

Martin
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post #8 of 22 (permalink) Old 03-31-2013, 08:20 PM Thread Starter
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Thank you for the reference Raymond, it's still working perfect btw (albeit backwards).

By all means clean it first, I did but the consensus is it won't last, mine didn't.

If you're not handy with a soldering iron, you can send it off to several places to be fixed.

But if you have soldered much, it's really a piece of cake

Happy Easter,
Ken
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post #9 of 22 (permalink) Old 03-31-2013, 08:29 PM
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Hopefully someone will get it pretty soon.
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post #10 of 22 (permalink) Old 05-03-2013, 10:13 AM
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Updates to disassembly process

DDaddy - This is awesome! I hated to be held hostage to beckerradiorepair.com over a $2 part. Thx for posting the details on the encoder. I ordered one for each of my becker1492 radios. I also ordered a Bourns encoder to see if that might work as an alternative with proper directionality and stem length.

A few updates to your process.

1. The 8 "tabs" on the back of the faceplace electronic card do not need to be messed with - they secure the LCD frame. Only the 3 torx screws need to be removed.

2. To pull off the face place, it was easier after taking the 2 torx screws off the top front corners of the radio case so one can spread the case - the lock-tabs on the side were difficult to push in enough to allow the face place to come out easily.

3. With the confidence that a replacement encoder could be procurred, I took the top off the faulty encoder to see if I could clean & repair it. I cleaned it up and reassembled it and that solved the problem for now..but I have the replacement encoders as backup if it fails again soon. I wouldn't have taken this risk if I didn't have a backup plan.

Hats off to you my friend!
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