Hi Craig, Thank you for your post and welcome to our forum! We can start by debugging this issue without removing the device for now. Please provide more details about the test setup. We will need to know more about the signal you are applying to the channel 4 input, the supply voltages used, what the output data looks like, the pass/fail conditions etc. A partial schematic and list of register settings will also be helpful to understand how the device is being used. Regards,
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