Troubleshooting at a distance is not something I enjoy.
I'm not an expert, but if you ruptured the fuse with enough energy, you may have damaged something upstream. I would look closely at the current shunts, the MOSFETs and the A/D converter. Some parts will likely have to be replaced, if you can still find them.
Good luck with the fix.
Very thanks for your help.
Second, sorry for my English, I hope all you understand it correctly, if not, tell me and will try to do it better.
I have a Tek TX3 and after a short circuit, the fuse F1 was dead. I changed it but did no work as it should be. It doesn't measure current correctly.
Your English is fine. However, you could provide more information for us to help you.
1) How did you damage the meter?
2) What did you do get the short circuit?
3) If you measure a 1A current, does it show 1A or something else?
4) Do the other functions like DCV, ACV, ohms work?
Thanks for you too.
The meter was damaged when measuring voltage, 220V AC or 380V AC I'm not sure, but with the probes connected to measured current. Then I do a short circuit.
The only malfunction after this was the current measurement. The four lower current scales measures less than the correct and a measure was displayed without any probe connected to the meter.
If this is going to be a long back and forth repair attempt exchange, please start a new thread.
Don't worry, not a long story, I hope
Last night I removed all the six mosfets (Q100 to Q105) used for the current measurement and I had found one shorted. The bad part is Q100, is a L2203NS from International Rectifier.
Then I had soldered Q102 to Q105, mount the meter and all is working fine but the two more bigger scales of the current meter, of course.
Now I need to order this bad mosfet and test it. I think this is the only bad part.
When I fix it I will put here the results.
Take note that the meter has three hardware current scales and all six transistors involved in this (Q100 to Q105) are mosfets.
Thanks all you for your help