Aperio AT2 acquisition of negative control tissue sample issues

Hi,

Our AT2 slide scanner has been working well for us, however we are having an issue with image acquisition of negative control tissue samples. We’ve tried ‘faintly stained’ settings in the programme but no luck. Are there any tips or tricks to capturing negative control samples that anyone can offer - either to the physical slide or the software? We spoke to Leica however they did not have any software settings suggestions to capture any images.

Thanks