An ablation apparatus includes an ablation energy source producing an electromagnetic energy output. On receiving the information concerning pre-maintenance from any one of the apparatuses such as a facsimile apparatus, copying machine and others, which are divided into a predetermined number of groups, the center system instructs to collect the information related to the pre-maintenance from all of the plurality of apparatuses included in the same groups. The one-dimensional projections are differentiated to obtain the gradients of the projections as the basis for the correlation of images separated in time and signal conditioning. A second accumulator is connected to the first and second connecting lines by a check valve. The solar collector assembly may include a second gas-filled chamber provided on the second side of the photovoltaic panel.