Photosystem II (PSII) is one of the proteins complex involved in the light-dependent reactions of photosynthesis, specifically, their enzymes capture the photons of light to energize electrons, and water is split to form hydrogen ions and oxygen.
The oxygen ions or protons are used by the ATP synthase to produce ATP and the electrons reduce NADP+ into NADPH.
So, this means PSII is responsible for the production of ATP and NADPH, but not for carbon fixation and the production of sugars.
This means ATP and NADPH concentrations would decrease, while there would be no change in the concentration of sugars.