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New 2ch pocket DSO+SG - Zeeweii DSO2512G

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Aldo22:

--- Quote from: marcs18 on February 13, 2024, 05:58:18 pm ---I do not have the schematics of DSO2512G, so , any information would be helpful.

--- End quote ---
Jebem posted schematics:
https://www.eevblog.com/forum/testgear/new-2ch-pocket-dsosg-sigpeak-dso2512g/msg4886369/#msg4886369

chemary:
The input circuity of ch1 and ch2 is mirrored, if channel2 works fine something between input and the ADC may have burn. Remove the shielding and you will see components are duplicated,
inject the same signal to both channels, then use a multimeter compare at some points to see at which point the input is different.
I suggest to start checking transistors, diodes and ICs close to the input (well do first a visual inspection to see if the burned component is evident).

Dry:

--- Quote from: marcs18 on February 13, 2024, 05:58:18 pm ---I actualy , tested the channel 1 and noted  the imput is not working. The equipment is not measuring anything.
...
Detal: Channel 2 is working properly , only channel 1 has this strange behavior......

--- End quote ---

Check the probes by swapping them (I doubt it's them, just to be sure).

marcs18:
Thank you for the schematics. I noticed they are draft, so some details are missing, anyway they are very helpful . Thank youso much

marcs18:
Thank you. it makes sense. i removed the shield and realy both circuits (ch 1 and ch2) are similar. I will follow your suggestion . Thank you again

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