Faulty multimeter

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Picked up this multimeter known to be not working

Had no display whatsoever

Hoped it was a dead battery 

Opened it up.  No battery 

Installed new battery....only display on certain modes.   

Checked internal $30 fuse.  Open 

Installed new fuse.  Fingers crossed.  No change 

Connected mini-grabbers and 150 ohm resistor

Continuity mode.  Nothing

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200 ohm range
Working

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2000 ohm range
Working

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20,000 ohm range
Working

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200 kohm range

Back to nothing 

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Not really equipped to diagnose or repair tiny surface mount stuff.

 

[g1]

I would see if you can verify switch contacts for bad ranges/functions.

[TomCarlos]

I would see if you can verify switch contacts for bad ranges/functions.

Agree with G1.  I had a similar issue to a meter.  The dial is connected to a circular metallic gizmo that turns and makes connections to points on a circuit board.  That metallic gizmo was dirty and had slightly deformed.  So I bent it here, bent it there, reassembled and voila, the meter and functions came back to life.  Make sure you also use some spray cleaner on all contacts and pots. 

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Thanks guys I appreciate it and like anything I'm working on it's not a big deal but at the same time I don't take your help lightly 

Anyhow I did some more disassembly and didn't really find any 🚭 smoking 🚬 guns

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Which was a good thing I guess but still at square one. 

So I put it all back together and no change 

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Meanwhile I really wanted to get the full size circuit board out so I was like dude just take it apart again and keep going 

So I noticed I would not be able to get the full size board out with the contact selector wheel in place but I didn't know how to get it off. So I tugged gently on the front of the meter and no go. 

Then I pulled from the backside and wow         

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Houston we have a problem 

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I do not know what happened I had suspected it had gotten wet.  Or ended up in the drink idk 🚢⛵

But now that I look at it I wonder if that is burn marks 

I could clean it up but as you can see one of those copper pieces is all mangled.


Anyhow thanks guys that was definitely interesting 

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I cleaned everything up real good and removed that mangled contact

I figured I would hopefully gain a few more functions but NO 

Now it has less functions I lost the low resistance range.

Yes I know that piece 🧩 is necessary but I think it's more necessary than I thought

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So now I have to try to find a replacement piece or fab something up (yeah right      )

Or just send it to the factory for service 

But yeah you guys nailed it for sure 

Thanks again

[g1]

Does the board clean up where those contacts meet?  It looks like some of the traces may be ground down.  If not, and the board is ok, you should be able to buy that actuator wheel with the contacts attached.

[g1]

If you have to send it away for repair, it's probably going to cost at least $70.
I would consider keeping it for parts and buying this one, might not be too far from you:  (edit:  sorry, it's an auction, I thought it was a 'buy-it-now' price)
https://www.ebay.com/itm/227084616674?_skw=amprobe+hd110c&epid=1401844557&itmmeta=01KABSCH8FV8H5NMRKW0FWRWTP&hash=item34df4c43e2%3Ag%3A9psAAeSwmxpo2-1j&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1fnRUmUcS3P%2BdQVruKeAwKNzlynRv5iNhKZfi%2Fqv3oeIPbqBoYLSxEM6YMVaGNE9kiQQgNTLImEEL62%2Bo8Y6SVG1%2BvXxGObZ4puIEBVCXvYe%2FtFUGp%2BExS82xkqVkfUqPzbAbeURINJ2gnkj1WPqBNayoGuuPjJVeioUOqED9H1xjmkYFJ5LBL%2Fkos24Z5bgfrqKTQ3pqDP%2BRadlutJALTKe3HpQz%2BDhxjnD3SEoBBR08HIXnh4wYZPZKgQIXPdhzNE%2FrnhsNR%2B3x%2BQsqkGWYoidhLoVyTe7oxTO7HCzF6b2w%3D%3D%7Ctkp%3ABk9SR66UsvnSZg&LH_All=1

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Thanks the MIGHTY G1 

I'm content at this point to remove the actuator wheel from a working unit I have two or even rob one of the little copper strips and see if it restores full function.

I spent $40 on this one which was pretty stupid but hey I learned my lesson trying to second guess complete strangers. 

It would have been nice to get a working FP 700 fuse out of it but oh well.

Limited reading other forums and stuff tells me they (Amprobe) are now owned by fluke and parts aren't really available.

So I'm content to try the actuator wheel transplant and see if it comes to life.

The fuse isn't a big deal the meter is supposed to work without just can't measure current.

Oh sorry forgot to mention the contacts on the board cleaned up very nicely with a swab and some isopropyl alcohol so there's that

But as you know there may be some damaged components.  And at that point all hope is lost but even then I must continue to trudge forward ⏩ and that would be near impossible but I do have some thermo tweezers now.

Hey anybody do you think that damage is from water or arcing/high voltage ⚡