How can I mend the tape player of my Panasonic RX-DS45?

How can I fix my tape player on my panasonic RX-DS45 ??
Other than that it is working very good the cd player work fine and the radio too but the tape player I don't know, I put a tape in it and select the tape mode, on the screen it show "TAPE-------" but when I click on the button nothing no sound no little motor si I think maybe it don't find the tape the censors are broken or bad contact I don't know...
Please HELP !!!