Nikon D3100 Service Manual. Nikon Camera Model D Series 3100. View or print the Nikon D3100 Service Manual below. The Nikon D3100 is a digital SLR camera featuring a 14 megapixel DX sensor and offers features like the learn as you grow system where as you get familiar with the camera, you can start to use the advanced features easily. The D3100 also offers full 1080P video recording and a NIKKOR image stabilization lens. If you are looking at a feature rich Digital SLR Camera, the Nikon D3100 is a good choice.