JVC 370 SC, 330, 340 SC service manual Service Adjustments

Chapter 3---Service Adjustments

the mechanical CRT focus should not be adjusted. If the image is not sharp enough, proceed with the CRT mechanical focus adjustment below.

There are three (3) adjustment rods for each CRT making a total of nine (9). The rods are accessed through holes, covered by hole caps, in the base and fan casing at the rear of the projector (see Figure3-3).

The focus rods will be adjusted so that each CRT face is completely parallel to its respective ILA® assembly, (i.e. positioning the CRT screen face planar with the ILA® along the x, y and z axes).

Each CRT has three (3) focus rods; lower-left, lower-right and upper-left. The focus rods for each CRT work as follows (see Figures 3-3 and 3-4).

The lower-left rod adjusts the CRT to ILA® distance (z- axis)

for upper-right corner and overall focus.

The lower-right rod adjusts the bottom position of the CRT

The upper-left rod adjusts left-side position of the CRT.

Figure 3-4CRT Focus Adjustment Apertures. Use a 5mm nutdriver to adjust the focus rods inside the apertures.

3-10 Model 330, 340SC, 370SC Service Manual