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BM869S not reading correct voltage

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LDDM:
Sorry  :palm: i forgot one picture (please see update to my previous post, Meter_16)

Fungus:

--- Quote from: coromonadalix on July 12, 2024, 12:23:18 pm ---yeah    but  see my link on my post    we see only 2 contacts

https://lygte-info.dk/review/DMMBrymen%20BM869s%20UK.html

--- End quote ---

Here, too...

https://www.eevblog.com/forum/testgear/brymen-bm-867-teardown-pictures/msg156229/#msg156229

But that makes no sense to me.  :-//   :-/O  :wtf:

LDDM:
I just found this post from 2022 of someone having (I think) the same issue.

https://www.eevblog.com/forum/testgear/brymen-bm869s-suddenly-weird-behaviour/

Similar thing here. It seems to be more common than I thought...

https://www.eevblog.com/forum/testgear/brymen-bm869s-stopped-measuring-ac-volts/25/

Port from 2018 with similar problems:

https://www.eevblog.com/forum/repair/brymen-bm869s-ol-problem-with-ac-measument/msg1918175/#msg1918175

joeqsmith:
Sadly as you have seen, seldom people who post about their problems ever provide a conclusion. 

I live near fresh water and it's not a problem like other parts of the USA.  I've never had to consider conformal coating.  Do you have to store your electronics in special containers or is not a problem where you live?  Is the humidity always high enough that ESD isn't a concern?   

J-R:
The BM869s is actually pretty well sealed.  There are gaskets/o-rings around the battery cover and the banana jacks, even the screw heads.  So I don't think humidity would impact it.

But you could still fully inspect the PCB under a microscope looking for any solder issues or corrosion, clean selector switch and jack contacts.

A side note is that each jack's BeepJack feature does not function if their respective fuse is blown, so double-check those.

What 9V batteries are you using?

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