HP DesignJet T790 gives indication clean paper from a way of passing

When priming a roll of T790 gives indication clean paper from a way of passing and highlights the icon of the sensor of the Sheet of paper it is located on the right support of a roll. In case of diagnostics of sensors requires to clean paper from a way of passing all previous steps of diagnostics of sensors pass normally: sensor of a front cover, sensor of the lever and sensor of passing of paper. Replacing of the sensor doesn't bring result. The cable is checked to the connector on EE-BOX board, is operational. On the SENSOR LED radiating moves 2.5V; on a photocell 3.3V collector, on the emitter 2.5V irrespective of existence of a barrier. In case of the removed sensor the same. Failure of the controller on a board of PCB05 EE-BOX??