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Klein MM700 multimeter repair

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vpd66

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Central Wisconsin
So a couple years ago (I believe fall of 2016) I was in the market for a quality multimeter. I read several reviews online and determined the Klein MM700 would be worth the money. I went to my local Home Depot and purchased one. I went home read the manual and it seemed to work well (I was happy). About six months ago I go to test the voltage of my 12 volt deep cycle marine battery and the meter won't work on voltage settings. I spend over an hour reading the manual thinking maybe the settings or something was wrong, but everything seems to be correct. I checked the fuses and batteries and they seem fine. I got frustrated with it and threw it in the tool box. I grabbed one of the $1.99 Harbor Freight specials i have laying around to test the battery and get the job done. Now since its winter and were buried in snow its time to figure out what's wrong with this meter. The ohm part seems to work right but when I change it over to voltage it seem to just wander displaying a few tenths of a volt. When I go to test a good AA battery the display goes to 0. If I keep the leads on the battery long enough the battery gets warm. It almost seems like its stuck in Ohms but the display changes to voltage? Anyone have any experience repairing these meters? Anyone know of a place that could possibly repair this for less then the cost of the meter? The strange thing is that this meter has been out for sometime and I can't find anything on the internet where anyone has anything bad to say about it. Did I get the only lemon??? LOL
 
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Citation

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vpd66 said:
So a couple years ago (I believe fall of 2016) I was in the market for a quality multimeter. I read several reviews online and determined the Klein MM700 would be worth the money. I went to my local Home Depot and purchased one. I went home read the manual and it seemed to work well (I was happy). About six months ago I go to test the voltage of my 12 volt deep cycle marine battery and the meter won't work on voltage settings. I spend over an hour reading the manual thinking maybe the settings or something was wrong, but everything seems to be correct. I checked the fuses and batteries and they seem fine. I got frustrated with it and threw it in the tool box. I grabbed one of the $1.99 Harbor Freight specials i have laying around to test the battery and get the job done. Now since its winter and were buried in snow its time to figure out what's wrong with this meter. The ohm part seems to work right but when I change it over to voltage it seem to just wander displaying a few tenths of a volt. When I go to test a good AA battery the display goes to 0. If I keep the leads on the battery long enough the battery gets warm. It almost seems like its stuck in Ohms but the display changes to voltage? Anyone have any experience repairing these meters? Anyone know of a place that could possibly repair this for less then the cost of the meter? The strange thing is that this meter has been out for sometime and I can't find anything on the internet where anyone has anything bad to say about it. Did I get the only lemon??? LOL
Click to expand...

Use the HF meter in ohm mode to test the input impedance of the Kline. It should be over 1 Mohm which is probably out of range of the HF meter. It would read as open circuit. However, I suspect you have a short in the input which is why the AA gets warm. The HF meter will probably read just a few ohms or lower. At that point you would need to figure out where you have a short. Sadly, this is probably something that you shouldn't fix unless you know what you are doing. You don't want to compromise the safety of the meter.

If you can post some photos of the inside.
 
S

Showkey

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Wausau WI
I would doubt anyone is repairing $100 meters. On board fuse maybe after not much economics in repairs. Warranty period....they likely ship new meters as their cost might be $33 or less.

DIY......Take the back off and look around for fried parts or black areas on the board. Battery corrosion from leaking battery. Blown safety fuse on the ohms side.
 
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Citation

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kd3pc said:
you will need a schematic to do anything but shotgun or speculate...
Click to expand...

It's certainly possible to diagnose and fix problems like this. I've done it more than a few times. Typically problems are blown input protection from over voltage (should not result in a short as that is very dangerous) or a mechanical failure or occasionally the micro controller. It's also possible to have a contamination type failure. Schematics can be handy but watching the EEVblog video about how multi meter safety works is probably just as good.

This blog is also a good primer
http://mrmodemhead.com
 
6

6PTsocket

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Mar 12, 2014
Messages
4,593
Citation said:
It's certainly possible to diagnose and fix problems like this. I've done it more than a few times. Typically problems are blown input protection from over voltage (should not result in a short as that is very dangerous) or a mechanical failure or occasionally the micro controller. It's also possible to have a contamination type failure. Schematics can be handy but watching the EEVblog video about how multi meter safety works is probably just as good.



This blog is also a good primer

http://mrmodemhead.com
Click to expand...
While on rhe subject of EEV blog, get on that board and post your question under the test equipment sub group or the beginners group. A lot of tech savy people there.

Sent from my SM-G900V using Tapatalk
 
R

Roba

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Dec 4, 2020
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Location
WV
Omfg, I got a lemon EXACTLY as you described it!! ¯\_(ツ)_/¯
Go figure, I took it apart bcos some of the older models had a fuse... this has a couple of components on the board that look like they could possibly be some kind of fusible link, but without a schematic of the circuit board, it's tough to run down!!
 
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