Sakurai 580 SD LED UV 2017 Error E8 all ink keys

Hi dear
I have a Sakurai 580 SD UV 2017 that some days it gives an error on the amplifier of the missheet sensor and the UV driver, which is solved by opening the driver wires and
re-closing the problem,
but last week after starting the device, suddenly all the ink keys all 5 unit went negative position ( -20 , -480 !) and stuck to the ink fountain rollers and all the valves gave E8 error , that is, the valve gear conflict with the overload sensor, and I could not correct the value and return it to normal by the operator and the color console,
and had to connect the external 24V power supply and Get rid of the conflict with the sensor
My question to you, the technician, is why this strange thing happened?!
 

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