Что означает ошибка E100 на данном аппарате и как с этим бороться ?

When the scanner motor is started up, the BD input signal does not arrive within a specific period of time.
When the scanner motor is started up, the motor rotation is too fast, and fails to reach a specific revolution within 20 sec at time of deceleration.
While the scanner motor is rotating at a specific speed, the BD input signal cycle is not within a specific range (±2%) for an equivalent of 10 mm (print distance).
While the scanner motor is rotating at a specific speed, the BD input signal cycle is not as indicated (±2%).
During the WMUPR period after the power switch has been turned on or the front cover/left cover has been opened/closed, the drum unit is absent.
Possible cause: The wiring is faulty (short circuit, open circuit). The laser scanner unit is faulty. The DC controller PCB is faulty. The drum unit is not installed.

Скорее всего полигон мотор лазерного блока клинит