Mamiya RB67 Mirror Stuck

File: mamiyarb67.jpg (203KB, 800x551px) Image search: [Google]

203KB, 800x551px

So I just received my RB67 in the mail today. I cannot seem to fire the mirror however. I have removed the dark slide. The lens shutter is cocked and the mirror is in the down position, I can the depress the shutter button but can't fire. If someone could help that would be great.

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Camera-Specific Properties:
Equipment Make	SONY
Camera Model	DSLR-A700
Camera Software	ACD Systems Digital Imaging
Maximum Lens Aperture	f/2.8
Focal Length (35mm Equiv)	75 mm
Image-Specific Properties:
Image Orientation	Top, Left-Hand
Horizontal Resolution	72 dpi
Vertical Resolution	72 dpi
Image Created	2010:11:15 22:00:15
Exposure Time	1/80 sec
F-Number	f/16.0
Exposure Program	Aperture Priority
ISO Speed Rating	800
Brightness	1.4 EV
Exposure Bias	0 EV
Metering Mode	Pattern
Light Source	Unknown
Flash	Flash, Compulsory
Focal Length	50.00 mm
Color Space Information	sRGB
Image Width	800
Image Height	551
Rendering	Normal
Exposure Mode	Auto
White Balance	Auto
Scene Capture Type	Standard
Contrast	Normal
Saturation	Normal
Sharpness	Normal