Do you have a dummy roll of film you could sacrifice, or at least a few frames? Load the film but do not close the back then hit the advance shutter button. See if the film catches and advances OK. It might be that the film is not catching properly on the advance gear sprockets or pressure device. Let me know if that works or not and then we can take it from there.

Thanks George and I will try what you suggested. I will let you know the out come.

namvet66

George,

I checked the shutter and it is working alright, also did a pen marking rest on a roll of file in the camera and it seem to be rewinding into the film case ok.

If processed film is coming back blank (i.e. clear) it is simply unexposed. There can only be two possible causes.
Either the film is not being exposed because the shutter is not opening or the mirror is not retracting, or, the film is not transporting. Sacrifice a roll of film by shooting twenty four heavily overexposed shots. After you have shot 24 shots and before automatic rewind, open the camera back in the dark. You can tell by feel if the film has transported. If the film has transported, have it processed. If it comes back clear, you have a shutter/mirror problem. If it didn't transport, you have a transport problem. Isn't the N75 one camera in which the film winds completely out of the cassette, then rewinds as you take pictures, thus protecting all prior exposures except the last couple from being fogged if the back is inadvertently opened? I guess I should know this because I have an N75 but have used it very little and have lost the manual. I guess I'll go put a roll of Seattle Filmworks junk movie film into it and see for myself.