JVC Model 200 service manual Service Adjustments

Chapter 3---Service Adjustments

Figure 3-2.Arc Lamp “Hot Spot” (whitest area) is off-center vertically and horizontally. Adjust to center the “hot spot”.

9.Insert a flathead screwdriver into one of the horizontal alignment slots shown in Figure 3-1 and pry back and forth to slide the plate. Center the “hot spot” horizontally.

10.Tighten the 4 horizontal alignment screws.

11.Loosen the 2 vertical alignment screws indicated by the letter V inside the screw heads in Figure 3-1.

12.Use a flathead screwdriver in the vertical alignment slots, shown in Figure 3-1, to pry the vertical plate up or down so that the “hot spot” is centered vertically.

13.Tighten the 2 vertical alignment screws.

14.Adjust the focus screw for overall brightness from the center to the edges with a minimum of rolloff. NOTE: Rolloff is the gradual difference in brightness from the center of the screen to the edges. Ensure the bright area extends to the edges of the screen but not over the edges. If possible, use a light meter to perform this step. If using a light meter, try to achieve a rolloff of no more than 4:1 to the screen corners. The darker areas in each of the corners should be balanced evenly.

15.When the Arc Lamp is focused over the entire screen area and balanced vertically and horizontally, reset the Green ILA® bias to original value.

Model 200 Service Manual 3-3