The shutter curtain of my Ricoh XR-10mm SLR camera does not open

SOURCE: XR 7 locked up

Just read on another forum where the film rewind button can get stuck (little button on the bottom of the camera, used to initiate rewind), and removing the camera bottom allows access to unjam it.  I'll try... takes a small philips eyeglass screwdriver and young eyes (or my reading glasses...) 

SOURCE: Ricoh XR-10 35mm SLR camera

stevdan,

take the screws off the bottom cover. there is a small lever pointing toward the front of camera with a black screw on it. gently move it to the left, this will release the lock lever. Now advance the lever and the shutter should fire. if not, it is not repairable. no parts
.

SOURCE: mirror is stuck in "up" position and film will not advance

Normally, stuck mirror is due to weak batteries with a elcetromagnetic shutter like the Ricoh. Try with brand new silver oxides and see if it helps!

SOURCE: I need to convert my manual lens to a digital body. what digital

If you have Ricoh lenses that do not have electrical contacts, you can use the lenses on Pentax digital SLR cameras.
If you have Ricoh lenses with electrical contacts, you can not use them on Pentax digital cameras.

SOURCE: Ricoh KS Super II 35mm

If the batterys are ok ,try rotating the speed control to X and the mirror will unlock from its upper position and the film will advance next time you try. Also the camera will not operate unless the leaver is moved away from its rest position, ie level with the camera body to its first movement area.