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8562EC A14 U429B wrong ref voltage

Question asked by marc1 on Mar 26, 2015
Latest reply on Aug 25, 2016 by minolta1
This 8562EC had err 334, 356, 317, 319.  I tracked down to U429B on the A14 board and found the inputs of the op amp are at -3mV and -8mV and the output is at 0.5V.  According to the attached diagram the ref voltage at the input should be at -0.1 to -0.25V on pin 5 of U429B.  I was wondering if anyone knows how to debug this issue.  Which DAC to look for and etc..? 

Also, where could I get the schematic for this spec?

Thank you!