The Limb bolt is screwed into a nut in the riser. You can back out the bolt until the string is loose enough to be removed from the cam to relax the limbs. If you plan to do so please put your bow on a flat place as the limbs will be very lose. if you are not sure how far you should turn your limb bolts out you can have a look at the nut in the riser. You can see the screw in it. If you turn it out you will see some light coming through it. if so you should stop immediately.
I own a Razor-X myself and this works very good.
If you only want to do some cam timing you can search for a tutorial by flytier. He explains how to time the bow without using a bow press or disassembling it.
(2) Martin ShadowCat 2010