Products > Test Equipment
Hantek 2000 series - 2C42/2C72/2D42/2D72
tautech:
--- Quote from: Madri on October 17, 2021, 08:30:47 pm ---Hola por favor he averiado el tester 2c42 midiendo en tension alterna cuando lo tenia en ohmios. He cambiado las resistencias R14 y R15 que estaban quemadas pero sigue igual. He medido tensiones en la zona que indico en la foto y donde debería de haber 5 voltios hay 4,94 votios que parece estar bien pero donde hay -5 voltios he medido -3,4 voltios. Y la tercera medida es de 3,3 voltios y la medida que daba es de 2,9 voltios. También me he dado cuenta que hay un integrado LTRA que se calienta mas de lo normal al lado de estas medidas pero no encuentro datasheet.
Pongo fotos
--- End quote ---
Welcome to the forum.
English only please.
Madri:
OK thank you
.rpv:
--- Quote from: Madri on October 17, 2021, 08:30:47 pm ---Hello, please, I have damaged the 2c42 tester by measuring in alternating voltage when I had it in ohms. I have changed the resistors R14 and R15 that were burned but it remains the same. I have measured voltages in the area that I indicate in the photo and where there should be 5 volts there are 4.94 volts which seems to be fine but where there is -5 volts I have measured -3.4 volts. And the third measurement is 3.3 volts and the measurement it gave is 2.9 volts. I have also noticed that there is an integrated LTRA that heats up more than normal next to these measurements but I cannot find a datasheet.
I put photos
--- End quote ---
Hi.
LTRA seems to be LT1931:
https://www.analog.com/media/en/technical-documentation/data-sheets/1931fa.pdf
But for what you said, this IC seems to be working just being overloaded, something else could be damaged an taking a lot more current that the IC can provide (or its components). R14/R15 are just to close to U4, your meter is it working and just giving bad readings?, if isn't responding at all U4 probably it's gone.
Madri:
5B515909-DC57-468C-8138-9F634247FABC.jpeg
--- Quote from: .rpv on October 17, 2021, 10:02:50 pm ---
--- Quote from: Madri on October 17, 2021, 08:30:47 pm ---Hello, please, I have damaged the 2c42 tester by measuring in alternating voltage when I had it in ohms. I have changed the resistors R14 and R15 that were burned but it remains the same. I have measured voltages in the area that I indicate in the photo and where there should be 5 volts there are 4.94 volts which seems to be fine but where there is -5 volts I have measured -3.4 volts. And the third measurement is 3.3 volts and the measurement it gave is 2.9 volts. I have also noticed that there is an integrated LTRA that heats up more than normal next to these measurements but I cannot find a datasheet.
I put photos
--- End quote ---
Hi.
LTRA seems to be LT1931:
https://www.analog.com/media/en/technical-documentation/data-sheets/1931fa.pdf
But for what you said, this IC seems to be working just being overloaded, something else could be damaged an taking a lot more current that the IC can provide (or its components). R14/R15 are just to close to U4, your meter is it working and just giving bad readings?, if isn't responding at all U4 probably it's gone.
--- End quote ---
Thanks for answering if the tester works but only the oscilloscope. The optocouplers I have changed them all. U4 I can't find it to buy it. You could replace it with this ? https://es.aliexpress.com/item/10000295208094.html
.rpv:
Didn't seem to be the same part.
You can test if U4 it's really bad, remove it from the board and test the voltages again, but yeah, it really seems that U4 it's gone.
Some one post a forum where it seems that you can get support from hantek:
https://www.eediscuss.com/forum.php?mod=forumdisplay&fid=44&page=1
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