Troubleshoot a bipolar amplifier circuit
What you have is essentially two inverting amplifiers, the first has adjustable gain and offset, the second is fixed and has a gain of 1.  So start with the ‘A’ amplifier - set the gain to about mid-range, set the input (pin 2) to about mid-range and then adjust the offset while monitoring the output voltage on pin 1.  You should see that the output voltage goes up and down with the offset voltage, and when this equals the input voltage, pin 1 should be at the same voltage too.  Once you’ve confirmed that the first amplifier is working properly, look at the second, which should output the complement of its input (e.g. 1 volt in results in -1 volt out).  Once it’s behaving properly, set the offset accurately for mid-range and then adjust the gain as required.