A light engine for use in a projector, comprising: a prism for receiving and separating white light into blue, green, and red light; a plurality of channel subassemblies (7, 8, 9) having imaging devices for receiving, modulating and reflecting said red, green and blue light back to said prism, which in response re-converges said light for projection onto a screen to produce an image; at least two of said channel subassemblies (7, 8, 9) being provided with convergence mechanisms for adjusting the orientation of respective ones of said imaging devices for convergence correction of the image projected on said screen; wherein each of said channel subassemblies (7, 8, 9) includes a plurality of fixed elements, at least one movable element housing a respective one of said imaging devices, and a plurality of manual adjustment screws mounted to said fixed elements for driving said at least one movable element and a plurality of wedge locking mechanisms for locking the position of said at least one movable element; wherein each of said plurality of wedge locking mechanisms comprises a locking shaft coupled to a pair of wedge driving blocks which in turn are adapted to drive respective wedge driven blocks around a pivot to contact and provide a compression force against said at least one movable element to effect adjustment and locking of said at least one movable element relative to said plurality of fixed elements; and wherein said locking shaft and said pair of wedge driving blocks are provided with threads of one hand at first ends thereof and threads of an opposite hand at opposite ends thereof such that said driving blocks move in opposite directions when the locking shaft is turned in order to counter balance force exerted on each driven block. a prism for receiving and separating white light into blue, green, and red light; a plurality of channel subassemblies (7, 8, 9) having imaging devices for receiving, modulating and reflecting said red, green and blue light back to said prism, which in response re-converges said light for projection onto a screen to produce an image; at least two of said channel subassemblies (7, 8, 9) being provided with convergence mechanisms for adjusting the orientation of respective ones of said imaging devices for convergence correction of the image projected on said screen; wherein each of said channel subassemblies (7, 8, 9) includes a plurality of fixed elements, at least one movable element housing a respective one of said imaging devices, and a plurality of manual adjustment screws mounted to said fixed elements for driving said at least one movable element and a plurality of wedge locking mechanisms for locking the position of said at least one movable element; wherein each of said plurality of wedge locking mechanisms comprises a locking shaft coupled to a pair of wedge driving blocks which in turn are adapted to drive respective wedge driven blocks around a pivot to contact and provide a compression force against said at least one movable element to effect adjustment and locking of said at least one movable element relative to said plurality of fixed elements; and wherein said locking shaft and said pair of wedge driving blocks are provided with threads of one hand at first ends thereof and threads of an opposite hand at opposite ends thereof such that said driving blocks move in opposite directions when the locking shaft is turned in order to counter balance force exerted on each driven block.