I have a MC Rokkor-x PF 1:1.7 on a Minolta SRT-201 body and I can't change the f-stop to more than 5.6 because a tab on the lens hangs up on on a tiny silver post on the front of the body where the lens screws on. When I take the lens off the f-stop ring moves freely.
That tiny silver post on the front of the body moves the pointers inside the body so you can see in the viewfinder where the aperture is set. It should move far enough that it lets you set 1.7 to 22. Check it to be sure the internal display matches the lens setting.
If it matches, and won't let you go all the way over, check the track for obstructions. Remove the lens and check the silver tab. It should go past the A in MINOLTA. Does the tab move all the way with another lens?
It sounds like something internal is blocking the movement of the ring or its linkage on the SRT.
I suggest a trip to the repair shop for the SRT. Garry Airapetov in Niles, IL repairs them at a very good price. He will fix it, clean, Lube, adjust it, and return it for around fifty dollars.
Look up Garry;s camera repair online to check prices and download the form you send with it.
He did a really good job with my SRT 101.
lightspiritphotography.com
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