StaticDischarge
Member
- Joined
- Mar 30, 2019
- Messages
- 295
Here are my 2 cents on this hum issue..
I took the cover off and I do have a factory installed NMP200 so I removed it.. The hum did get much more noticeable!
So I took it all apart to see what, if anything could be done and here are my findings:
The NMP200 simply connects the "screen ground" of the display to the chassis.. That is it!! (which explains why, over time, people start hearing the hum return - loose fitting part and oxidation.)
So on further inspection I see that the "screen ground" is in fact soldered to the front board's ground plane pretty well. I also saw (the main issue I am about to explain a fix to) is the four mounting screws that hold the front board to the chassis ARE NOT CONNECTING the front boards ground plane to the chassis! Which in fact is EXACTLY WHAT THE NMP200 DOES. Simple fix really... without soldering!
The tools I used:
No. 1 & No. 2 Phillips screwdriver
Small flat jewelers screwdriver
X-Key tool
Credit card (or similar to not mar the faceplate or knobs upon removal)
X-acto or utility blade
To help removal of the wire plugs that connect the front to the main boards I used curved hemostats
If your eyes are going (like mine are) some type of magnification
Once you have the radio taken apart (explained elsewhere on the forum) and have the front panel in your hand, display towards you, you will see four (No. 1) screws towards the corners of the front board (notice the green lacquer all over and under the screw heads?). One at a time remove the screws and CAREFULLY scrape the lacquer from under the screw heads but DO NOT SCRAPE AS HARD THAT YOU REMOVE THE COPPER FROM UNDER THE LACQUER!! and replace the screw. Now to make sure you have good contact, tighten, loosen, tighten, loosen and tighten the screw a few times.
Now carefully put the scanner together without the NMP200 and test..
I hope your results are as satisfying as mine..
If you do anything I have explained here, you will not hold me responsible for anything that may happen, what-so-ever. You will assume full responsibilities for your own actions (which you should always do... period!). This includes but not limited to the leakage of liquids from your body due to the misuse of sharp objects!
Normal scanning may now resume...
Admin, Please make this a sticky...
I took the cover off and I do have a factory installed NMP200 so I removed it.. The hum did get much more noticeable!
So I took it all apart to see what, if anything could be done and here are my findings:
The NMP200 simply connects the "screen ground" of the display to the chassis.. That is it!! (which explains why, over time, people start hearing the hum return - loose fitting part and oxidation.)
So on further inspection I see that the "screen ground" is in fact soldered to the front board's ground plane pretty well. I also saw (the main issue I am about to explain a fix to) is the four mounting screws that hold the front board to the chassis ARE NOT CONNECTING the front boards ground plane to the chassis! Which in fact is EXACTLY WHAT THE NMP200 DOES. Simple fix really... without soldering!
The tools I used:
No. 1 & No. 2 Phillips screwdriver
Small flat jewelers screwdriver
X-Key tool
Credit card (or similar to not mar the faceplate or knobs upon removal)
X-acto or utility blade
To help removal of the wire plugs that connect the front to the main boards I used curved hemostats
If your eyes are going (like mine are) some type of magnification
Once you have the radio taken apart (explained elsewhere on the forum) and have the front panel in your hand, display towards you, you will see four (No. 1) screws towards the corners of the front board (notice the green lacquer all over and under the screw heads?). One at a time remove the screws and CAREFULLY scrape the lacquer from under the screw heads but DO NOT SCRAPE AS HARD THAT YOU REMOVE THE COPPER FROM UNDER THE LACQUER!! and replace the screw. Now to make sure you have good contact, tighten, loosen, tighten, loosen and tighten the screw a few times.
Now carefully put the scanner together without the NMP200 and test..
I hope your results are as satisfying as mine..
If you do anything I have explained here, you will not hold me responsible for anything that may happen, what-so-ever. You will assume full responsibilities for your own actions (which you should always do... period!). This includes but not limited to the leakage of liquids from your body due to the misuse of sharp objects!
Normal scanning may now resume...
Admin, Please make this a sticky...
