Poorly Mamiya 7. Self help or have it serviced?

[Ti29er]

Hi.

I have a Mamiya 7 that is not showing the changes in framing marks when I change lenses and the range finder operation is clearly "out" as are the lenses out of focus, although at f16 and 30ft it's not as pressing matter as it maybe in the future.

Is this something I fix myself?
If not, to whom do I turn?

Lastly, is there a link / web page that gives me the edge of frame marks for the 80 and 150mm lenses I can reference?

Thanks
Tim

[Blanc]

The M7's rangefinder is accessible for a really skilled amateur with an average knowledge of rangefinders.
If you've never done the job or just a few calibrations I won't recommand it.

I can't give you a name without knowing in which part of the world you live.

There is some info somewhere but I can't grab the link now, try to see if you can find the manual.