Products > Test Equipment
BM786 Switch Issue
floobydust:
Um, what is the omission you are talking about?
I just see a gorilla used 180 grit sandpaper on the rotary switch portion of the PCB. They should use an angle grinder instead. WTF are they doing. Those scratches are terrible on thin copper.
The rotary switch tracks don't look gold plated? Maybe they are sanding off the ENIG and plating something else there. edit: nope, the via's still are gold. So they have some selective plating going on here.
I don't see pogo-pin indentations anymore.
P.S. - If you clean the PCB with IPA, don't forget to lubricate the switch portion.
Kartika:
--- Quote from: raftronik on March 18, 2021, 06:52:34 pm ---Why power switch has to be on rotary switch not separate switch. My Metex has separate power ON OFF switch, it is very usefull.
--- End quote ---
yes, very useful. increases switch cycles
Kartika:
--- Quote from: floobydust on March 25, 2021, 07:56:57 pm ---Um, what is the omission you are talking about?
I just see a gorilla used 180 grit sandpaper on the rotary switch portion of the PCB. They should use an angle grinder instead. WTF are they doing. Those scratches are terrible on thin copper.
The rotary switch tracks don't look gold plated? Maybe they are sanding off the ENIG and plating something else there. edit: nope, the via's still are gold. So they have some selective plating going on here.
I don't see pogo-pin indentations anymore.
P.S. - If you clean the PCB with IPA, don't forget to lubricate the switch portion.
--- End quote ---
which lubricant do you recommend
this is not burned but the layer is separated ... i belive bad procesing
floobydust:
The lubricant to use... that discussion will start a holy war here. Best to ask Brymen what they suggest.
What do the wipers look like on the BM786 rotary switch? as far as metal and plating.
I found mineral oil is commonly used on the PCB, Fluke I believe uses that. A contact cleaner and lubricant with polyphenylene ether (PPE) is the only thing stopping oxidation from bad connections, when a switch has poor metallurgy or p[oor mechanical design (low force).
Is that PCB pothole on your multimeter? I don't see it in your first pics so I'm a bit confused.
tautech:
--- Quote from: Kartika on March 25, 2021, 08:07:53 pm ---
--- Quote from: floobydust on March 25, 2021, 07:56:57 pm ---Um, what is the omission you are talking about?
I just see a gorilla used 180 grit sandpaper on the rotary switch portion of the PCB. They should use an angle grinder instead. WTF are they doing. Those scratches are terrible on thin copper.
The rotary switch tracks don't look gold plated? Maybe they are sanding off the ENIG and plating something else there. edit: nope, the via's still are gold. So they have some selective plating going on here.
I don't see pogo-pin indentations anymore.
P.S. - If you clean the PCB with IPA, don't forget to lubricate the switch portion.
--- End quote ---
which lubricant do you recommend
this is not burned but the layer is separated ... i belive bad procesing
--- End quote ---
Yep it's another dud one like this one Fungus spotted earlier.
Ask Dave to replace it.
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