unable to print any tick of paper - c452

[miladssd]

please help ....

i have a problem. my copier (c452) unable to print any tick of paper.
i change casset board and print board ( main board)

[bradanzy]

Please check the motor of bypass tray it can cause not to print thick card

[miladssd]

Please check the motor of bypass tray it can cause not to print thick card

i change bypass unit and feedrollers but there`s same problem