DC102 A, PPC v3.1.1, take channel 1 for example, Micbias is setup to 9V,
1)Open inputs diagnostic
Hardware setup: J3,J4,J7,J8 installed, J11, J12 uninstalled, Remove J36, J37, VIN1M=0.035V, VIN1P=8.63V,
In order to detect no input issue, we need to set short to Micbias detect threshold to 420mV.
2)INM short to Micbias
Hardware setup:J3,J4,J7,J8,J36,J37 installed, J11, J12 uninstalled, J33(Micbias is installed), the SW2 switched to C1, press SW1,
IN1P from 8.21V to 8.84V, CH1_LTCH and CH1_LTCH are set to '1'.
When I adjust short to Micbias detect threshold from 420mV to 180mV or lower, only CH1_LTCH is set to '1'.
There is a contradiction about short to Micbias detect threshold setup between 1) and 2).
Do you have other suggestions?