Certain cameras are easier to work on than others. Here is a thread I did that shows some simple repairs on a Yashica FX-3 http://www.apug.org/forums/forum52/9...nical-slr.html
I also have a Rollei SL2000F that has gone bad on my workbench now. I have already replaced it with another SL2000F from ebay and two SL3003s. That camera would be at the far extreme from the Yashica. I have only heard rumors of a repair manual for those and I have been using the SL2000 cameras since they were availabe new in 1985.