Epson Printer All lights are blinking.

Hello everyone,

I was sent out my old printer Epson ET 2500 Printer, but it had ink leakage and was all over it, though i cleaned it but i do not know where is the SENSOR that detects that paper is stuck, i checked and opened the printer pretty much 80-90% and there isn't anything i could find and i do not know where i could find that sensor.

I even bought and replaced the inkpads but yet it is giving me error of all lights blinking. so i thought maybe someone has this error and had fixed or know where about is the SENSOR that i could try my hands on cleaning please?

Thanks for your time!