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Old 10-18-2021, 07:30 AM   #9
sam_sam_sam
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Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
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Default Re: Radio Shack 2200813 29 range DVM

It could be the picture it self but I see some soldering joints that do not look very good I would check each and every soldering joint under a magnifying glass and reflow anything that does not look good

One other thing to be aware of is that meter leads have an issue with bad terminal connection issues and the meter leads that you get Radio Shack had these issues if you used the leads a lot

Or the wire that is used to make these meter leads are very poor quality and is corroding in the meter tip soldering joint or on the barrel end or both ends and will be either green or black in color on the wire strands bundle

Or the connectors pins on the barrel become loose in the mating connector spread them out a little bit and reinstall them and see if this makes any difference or not

However if the swivel is very loose and has play in it then this could also cause you problems as well it should be locked in place or if it rotates it should give you resistance to to move if not replace the barrel end with a new one

I have also seen where the barrel connectors corrosion inside the connector it self if that is case you can improve the connection by taking a piece of sandpaper roll tightly up that fits in the connector space and rotate it back and forth but note that if you have to do this then you are going to have this issue all the time

One more thing to be aware of is that if you have used this meter a lot the switch connections to the board can have corrosion on the traces or on the connection metal tabs that meets the board traces or not enough tension to the board end you can bend them outward however be very careful doing this because if you do to much of this can break them

I have a meter that has also done this as well but then some other failure issues happen to this meter and I stopped using it

I have 4 1/2 digit meter that has this issue can make you go mad because it a nice meter otherwise and it is the same problem with the meter barrel connector that becomes loose fitting in the connector and do not read the voltage or ohms correctly

I hope this helps
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These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
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All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 10-18-2021 at 08:12 AM..
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