Canon A-1 Aperture Problem

Canon A-1 Aperture Problem
Hi
I am new here and actually came across the site will trying to google this problem. Someone else seemed to have problems with the aperture settings on their A-1 also, sadly my problem seems slightly different...
When shooting in AP the LED is reading that aperture value is changing but when shooting in manual when using the aperture ring instead of the AT dial the reading on the LED isn't changing at all. I could be wrong but surely if the reading is changing while on AP then the aperture is working correctly on the camera but still it doesn't change with the ring. I have tried a different lens and I'm still having the same problem. If anyone could help me out that would be great.
Thanks!

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