EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: jimthegreek on July 29, 2022, 11:52:40 pm

Title: EEV Blog Brymen BM235 true rms multimeter repair question
Post by: jimthegreek on July 29, 2022, 11:52:40 pm

I have a eevblog brymen meter that I purchased appx. 2-3 years ago. When i turn the meter on from the off position to the first position which is for voltage, the meter works. If I move the selector switch past that position to any other position, the display is blank. I replaced the batteries twice but I dont know why it doesnt work. Can someone tell me what to do? I hardly used the meter and it stopped working. Thanks.

Title: Re: EEV Blog Brymen BM235 true rms multimeter repair question
Post by: J-R on July 31, 2022, 08:59:19 pm

At this point might as well take it apart and inspect the rotary switch?

Title: Re: EEV Blog Brymen BM235 true rms multimeter repair question
Post by: shakalnokturn on August 01, 2022, 02:26:52 am

Also look for any signs of battery ooze on the PCB.
Hiw did you first notice the problem? Long storage, batteries dead, replaced, DMM defective?

Title: Re: EEV Blog Brymen BM235 true rms multimeter repair question
Post by: caulktel on August 02, 2022, 08:12:41 pm

Mine has done that from day one, I found that rotating the selector switch real fast back in forth cleans the contacts and then it starts working again. I suppose I could take it apart and burnish the selector contacts but I'm lazy.