A simple model to cover the two-component scenario of cuprate superconductivity is developed. Interband pairing interaction acts between itinerant and defect states created by doping. Two defect system subbands correspond to "hot" and "cold" regions of the momentum space. Superconductivity energetic characteristics vs doping are compared to experimental findings. Transformations of two pseudogaps into superconducting and normal state gaps can be traced. Doping concentrations where the band components begin to overlap determine essential borders on the phase diagram. Qualitative agreement with observations is present including the effect of photodoping.
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