It was time!

[RandyKuff]

My SDS200 is a little over two months old. Initially I would have to put my ear to the speaker (I use an external) to hear the hum/scanning pulsing noise.
Now I can hear it standing 2 to 3 feet away from it.

So it was time to do some surgery on it. Disassembled the radio and removed the solder mask from the display boards 4 mounting screws. Thanks to
https://forums.radioreference.com/members/staticdischarge.1257298/ for his findings and solution to this problem.

After putting the radio back together (Mitigation part totally removed) all hum and scanning pulse noise is totally gone.

This is what I used to remove the solder mask.

Excelta - 267 - Brushes - Scratch - Straight - Two Star - Plastic Handle with Fiberglass Bristles, 0.25" Height, 0.63" Wide, 1" Length: Electronic Components: Amazon.com: Industrial & Scientific

Excelta - 267 - Brushes - Scratch - Straight - Two Star - Plastic Handle with Fiberglass Bristles, 0.25" Height, 0.63" Wide, 1" Length: Electronic Components: Amazon.com: Industrial & Scientific

www.amazon.com

To UNIDEN...
This fix is well documented and it works...
I'm sure the PC boards are done on a CAD/CAM system... What would it take, 5 min to pull back the solder mask from around the display boards 4 mounting screws...
To me thats a cost reduction... NO MITIGATION PART NEEDED...

 

[Kaleier1]

Welcome to the world of humless scanning. I could hear mine from over 6 feet away before I did this fix and it had the mitigation part installed.

 

[RandyKuff]

To me the mitigation part was a band aide... We all know what heppens to them when they age...
Myself, I think it was starting to oxidize causing a resistance build up...
Sure didn't take long for it to start failing though...

 

[Spijkie01]

How do you remove the screws behind the volume, squelch knobs?

 

[buddrousa]

Unauthorized modification to fix hum

For me I would rather take on a challenge and see how its done and take on a project and do it and WOW myself once I fixed it. This is all about learning and growing in-stead of being scared and worrying about some warranty issue. Plus the cost of shipping the radio and the time the radio is...

forums.radioreference.com

 

[RandyKuff]

How do you remove the screws behind the volume, squelch knobs?

Amazon.com: AOER Silver X-Key Repair Tool Destuffing for Two-Way Radio Walkie Talkie Motorola GP-300 GP-88 GP-328 GP-328plus Puxing PX777(PX-777) PX-777plus PX-328 Baofeng UV-5R WOUXUN HYT TYT PUXING Radio: Home Audio & Theater

Amazon.com: AOER Silver X-Key Repair Tool Destuffing for Two-Way Radio Walkie Talkie Motorola GP-300 GP-88 GP-328 GP-328plus Puxing PX777(PX-777) PX-777plus PX-328 Baofeng UV-5R WOUXUN HYT TYT PUXING Radio: Home Audio & Theater

www.amazon.com

And a small short phillips screw driver to get the front panel off...

 

[bravo14]

When I first got my unit it was doing that. I send it to uniden and they sent me a new unit. A week later it was doing it again til I got a hold of @StaticDischarge and he was able to fix for me it since than no hum.

 

[crippledchicken]

Worked perfect on mine also!

 

[N8TXX]

My SDS200 is a little over two months old. Initially I would have to put my ear to the speaker (I use an external) to hear the hum/scanning pulsing noise.
Now I can hear it standing 2 to 3 feet away from it.

So it was time to do some surgery on it. Disassembled the radio and removed the solder mask from the display boards 4 mounting screws. Thanks to
https://forums.radioreference.com/members/staticdischarge.1257298/ for his findings and solution to this problem.

After putting the radio back together (Mitigation part totally removed) all hum and scanning pulse noise is totally gone.

This is what I used to remove the solder mask.

Excelta - 267 - Brushes - Scratch - Straight - Two Star - Plastic Handle with Fiberglass Bristles, 0.25" Height, 0.63" Wide, 1" Length: Electronic Components: Amazon.com: Industrial & Scientific

Excelta - 267 - Brushes - Scratch - Straight - Two Star - Plastic Handle with Fiberglass Bristles, 0.25" Height, 0.63" Wide, 1" Length: Electronic Components: Amazon.com: Industrial & Scientific

www.amazon.com

To UNIDEN...
This fix is well documented and it works...
I'm sure the PC boards are done on a CAD/CAM system... What would it take, 5 min to pull back the solder mask from around the display boards 4 mounting screws...
To me thats a cost reduction... NO MITIGATION PART NEEDED...

I've had my SDS200 since the beginning, well almost, it did come with the mitigation fix. And actually it worked for some time. My SDS200 had been stationary. I decided to move it, basically to clean. When I put it back and turned it on, it hummed quite loud! So, disassembled and used my dremel tool to remove the finish from the board. All hum is gone! What a great find!
Thanks!