Scope 1 stuck at 20V due to overvoltage

[rakunann444]

Hello,

Because of my carelessness, I broke Scope 1 by 100V overvoltage.(Scope 2 is alive.)

Can I fix it by replacing the ADG612, which is the "Scope Input Divider and Gain Selection IC"?

Thanks,
rakunann444

Edited October 22, 2021 by rakunann444

[JColvin]

Hi @rakunann444,

I have moved your question to a more appropriate section of the forum where the engineer much more familiar with the Analog Discovery 2 hardware will be able to see and respond to your question.

In the meantime, I would recommend taking a look at this thread (as well as the other threads linked within it) for some troubleshooting options that you have regarding this.

Thanks,
JColvin

[rakunann444]

Hi @JColvin,

Thank you for your reply and moving question's section.

I'll take a look at the thread you gave me and other threads.

Thanks,
rakunann444

[attila]

Hi @rakunann444

Here you can find the layout and more info:

 

[rakunann444]

Hi @attila,

Thank you for sharing the thread.
I'm surprised to see the exact same case.

I checked VREF and VOFF,
- VREF1 and 2 were both 2.0V
- VOFF1 and 2 were:
   when 0V offset, both 2V
   when +2V offset with 500mV/div range, both 3V
   when -2V offset with 500mV/div range, both 1V
(To be exact, when -2.5V offset, "Channel 1 range will be extended" was displayed, so I set it to -2V.)

Secondly, I did "Load factory" and checked calibration is not changed.

I'm going to buy and replace ADG612.
I'll contact you afterwards.

Thanks,
rakunann444

Edited October 23, 2021 by rakunann444