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BM786 Switch Issue

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Pokey44:
Yeah, I already inspected my contacts under my scope and they look good and clean, same for the springs. It's very disappointing to have bought a $250 meter that I can't get any support on. I'm ready to just buy a really nice Fluke and be done with it.

J-R:
I think on the spring contacts I'd mostly be concerned with making sure they are springy enough to push on the PCB under all conditions.  If you remove the top cover and press the remaining portion of the selector switch towards the PCB, does that change the behavior?

Any issues with power delivery?  The BM78x battery holder has contacts that could be flaky.

Was the seller on Amazon Dave or someone else?

Pokey44:
Thanks for the reply. I bought it from seller "EEVBlog" on Amazon. I have contacted the seller a few times. They did respond once, and told me to just have Amazon deal with the return... but I can't return it, it's been too long (ordered in October 2022), and follow-up questions for support/warranty went unanswered. I don't know if it's Dave though, maybe someone else manages it? I'm guessing if it *is* him, he probably sends a box of them to Amazon for fulfillment and they do the rest.

I didn't see any issues with power delivery, but also powered it with a bench supply to be sure. Same flakiness.

I also suspected the springiness of the springs and gave it a good push as I turned which didn't seem to make a difference.

What I often see is that on a "cold start" after its been sitting a while, it will sometimes power on when the rotary dial hits a few positions in (usually the 3rd). Once it is latched on, the dial works fine to switch between all the modes. Once I turn it back off, it's a crap shoot whether it wants to start up again -- and again it has to be turned a good ways before it kicks on, never on the first position. However, eventually, it dies entirely and will not power on at all in any position. After it sits a while, though, I can manage to get it to turn on again by hitting the 3rd-4th position or so as before. And the cycle repeats. Pressing or pulling on the knob to increase/decrease spring pressure makes no difference that I can tell.

I'm a hobbyist/tinkerer grade guy, not a EE, and still learning. After watching Dave's videos diagnosing different things on these, he mentions there's a latching power-on circuit that he theorized could go bad. Maybe that could be it?

mwb1100:

--- Quote from: Pokey44 on April 18, 2023, 10:37:43 pm ---it's been too long (ordered in October 2022), and follow-up questions for support/warranty went unanswered

--- End quote ---

From the last page of the manual:

--- Quote ---To obtain warranty service, contact your nearest BRYMEN authorized agent or send
the product, with proof of purchase and description of the difficulty, postage and
insurance prepaid, to BRYMEN TECHNOLOGY CORPORATION.

--- End quote ---

Contact info is:

BRYMEN TECHNOLOGY CORPORATION
TEL:+886 2 2226 3396
FAX:+886 2 2225 0025
http://www.brymen.com
info@brymen.com

If you seek warranty assistance directly from Brymen, let us know how it goes.

NoisyBoy:
It is unfortunate to see the issue with your meter, it very well could be a power supply issue elsewhere in the meter, and not just the rotary selector switch.  The mechanical vibration while turning the dial might just have trigger the power up/down condition.

While I like my Bremen meters, the difficulties in obtaining post-sale service locally is the biggest drawback.  Sending it back to Europe for repair is just not economically justifiable, or worth the time considering the paperwork you have to fill out.

Fluke provides local repair service, along with lifetime warranty (kind of) for its higher end meters, which may justify its higher price for users who depends on their DMM for their daily jobs.

Unfortunately, EEVBlog is just a distributor, other than an exchange for DOA, I think they will likely referred you back to Brymen for warranty claims.

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