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DSO 112 Fault

Posted: Fri Jan 18, 2019 8:33 am
by Jery
May be it will be usefull for somebody. Week ago I had recieved DSO 112 from Aliexpress. When I checked it, I had noticied , wrong voltage measurement at two ranges 50mV and 5V. It was two times exceed the expected value. I'd guessed, it is ADC resistors line problem, opened the device cover, and checked it. And Yes! Two resistors R32 and R34 need to be 150 Ohm and 49,9 Ohm were swaped. I resolder them and the problem had gone away. May be it will be usefull, because I think all devices of this production batch from China is the same and some people will face this problem too.

Re: DSO 112 Fault

Posted: Thu Jan 30, 2020 4:26 pm
by DarthTBag
This sounds like the same problem I have. Which are the two resistors R32 and R34 that needs to be swaped? Sadly the schematic or assembly diagram from this forum can't be opened.

Thanks for the Help. Regards,