Ricoh rz-115 film camera

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Pull up on the rewind knob and the back will pop open. The camera takes standard 35mm film.

I'm not sure, but I believe the D2-RZ is basically a rebranded Topcon RE200. If so, then this manual should help.

You may download a copy of the manual here.

It uses a 6V lithium battery, Panasonic CRP2p, Duracell DL223A, Kodak K223LA, or equivalent.

If you need a manual, you can download one at
http://www.cameramanuals.org/ricoh_pdf/ricoh_rz-105sf.pdf

You can download and print your camera manual, at not cost, by following the link below. The original poster has requested a donation of $3, but that's entirely up to you.

http://www.cameramanuals.org/pdf_files/dakota_rz-2000.pdf

The camera itself uses standard 35mm film. You choose the "film speed" according to what you intend to use the camera for, but ISO200 is easy to obtain and good for most things.

The Dakota RZ-2000 is simply awful. It's a very cheaply made design and suffers from really poor build quality and has dreadful, image-blurring and very noisy mirror slap. Th lenses it was originally supplied with were also of inferior quality. I personally wouldn't buy it at any price, but it's certainly not worth $80 when better quality, major name (but older) 35mm models are now effectively often worthless and can be obtained for nothing on FreeCycle and Freegle. I get all of my 35mm equipment from there. Recently I've even had perfect, boxed and near-unused Nikon and Canon Autofocus models, but I personally prefer the older manual focus SLR's such as the excellent Olympus OM1n.

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.

Any Pentax K-mount lens will fit any Pentax DSLR. The DSLR will fire the shutter.  There is a menu setting (RTFM) which allows the use of older lenses, but you will lose some of the automation (again RTFM). Remember to allow that the effective focal length when using a "film" lens on a DSLR body goes up by 50%.
A standard 50mm lens becomes a 75mm equivalent, but stays a large aperture.

You can find the manual at http://www.butkus.org/chinon/ricoh.htm

The shutter parts are most likely broken. That is usually the tell-tale sign of a broken camera, not advancing. Repairs for film cameras are very expensive and if parts are needed, it may be impossible for a 20+ year old camera. My suggestion is to find a replacement film camera system. Your Ricoh lenses will fit on a Pentax camera, but not work in Auto Mode. Prices of used Pentax cameras with built in motor drives are around $100. Check on line cameras stores. They have lots of use cameras/lense. A lens to use on that is another $75 or so. Only Nikon and Canon make new film cameras anymore. If you want an indestructable K-mount, find a Pentax K1000. Many lenses are available but no motor drive nor auto exposure on that model.