Electronics > Repair
Please help, FLUKE 8920A Multimeter Repair
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daisizhou:
I tried to measure,Please note that I cannot confirm exactly the left or right side of the resistor,In other words, the voltage value on the left side of the resistor may be on the right side.

If you can please tell me and I will continue, if it loses its meaning I will wait for your advice

Say one more thing,During the measurement, I found that these voltage values can sometimes be stable,If a fluctuation occurs, the 8920a is about to return to normal
Harry_22:
Very good.
Now please measure resistance between points 1 and 2 as well as between 1 and 3. Connect the positive probe to point 1.

Measure very gently without touching PCB parts!
daisizhou:
The forward resistance is infinite. I tested the reverse resistance. Please see the picture.
daisizhou:
Hallo.
During my test yesterday, I found that these two chips were heating up very violently.I'm referring to the fault status that shows "700" flashing,I used my finger to touch and it was so hot that I couldn't even keep touching that kind of heat.

Today the 8920a is in normal condition, I also touch it with my fingers and they only have a little bit of heat.

I don't know if this is a useful clue, I hope it will be helpful to your analysis.Do I need to use infrared vision to shoot video? Let me know if you need to check it out, the infrared temperature shot is at a friend of mine's and I need to borrow it.
Or I have a K-type temperature probe. If you need to check the temperature, I will shoot a video for you.
Harry_22:
Well done for finding the overheating.
These are voltage stabilizers. This is another indicator that the operating mode of OPAmp_A is changing. It can be seen in Multicap too.
 
Measure the voltage at points 1, 2 and 3 at the time of the malfunction.
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