Electronics > Repair
Please help, FLUKE 8920A Multimeter Repair
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daisizhou:
I disassembled and cleaned the P102 pins,The fault of "700" flashing seems to have been eliminated.
But when the "LOW RANGE ENABLE" button is pressed, the pointer still swings back and forth.
Below are the pictures I took while cleaning the P102.

Do the other two pins on this module's mainboard need to be disassembled and cleaned like P102?






https://i.postimg.cc/pXmrx46Z/P40612-123927.jpg
https://i.postimg.cc/zBf57Rmj/P40612-123939.jpg
https://i.postimg.cc/05B5tZyJ/P40612-124009.jpg
https://i.postimg.cc/T3rR36qr/P40612-124021.jpg
daisizhou:
After disassembling P102, I saw a dark red jelly substance in the part that contacts the PCB.Looks a bit like rust, but not solid
It is not a flux such as rosin.

So I am thinking, is it necessary to clean the remaining 2 at once, and whether the bottom J102 also needs to be cleaned
Harry_22:
Have you unsoldered R241 and measured trace resistance?
Have you seen back side of the motherboard?
daisizhou:
I measured the resistance of R241 online. I did not disassemble it. If you think it is necessary to disassemble R241, I will disassemble it.

https://i.postimg.cc/k5RyPwDf/r240.jpg
https://i.postimg.cc/B6xcX6TF/r241.jpg
https://i.postimg.cc/xCr3fHzY/r241-15v.jpg
https://i.postimg.cc/L52kfpDb/r241-1.jpg
https://i.postimg.cc/nr24GPwc/r241-2.jpg

Do you mean the biggest PCB at the bottom?If so, I checked it and it's very clean.Do you need a photo?
Harry_22:
Then don't take it apart again. We have a less difficult way to check.

Assemble multimeter and measure the voltage from one side to the other of R241.
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