A method and system for improving Field Replacement Unit isolation in memory sub-systems by monitoring Voltage Regulator Module induced memory errors. The resin layer has gaps extending between the wiring lines. Each group includes votes for intervals of the video that are similar to each other. The second input circuit receives a first voltage pair including the high voltage and the low voltage, and a second voltage pair including the sub-high voltage and the sub-low voltage. A shade film is formed on a wall surface of each groove of the diffraction grating to enhance the angular characteristic of the grating. A bushing, which is capable of providing force to a friction cylinder which permits rotation of the tilter about an axis, is adjustable vis-\xe0-vis the friction cylinder via a set screw to provide additional counterbalance force to the tilter to support the weight of the user device.