5-5 Lens Focus and Static Focus Adjustment
5-5-1 Static Focus (Electric Focus)
PREPARATION 1. Select the �STANDARD� video mode. 2. Input a crosshatch pattern. 3. Cover the lenses that are not being adjusted. 4. Connect a convergence jig and read data. 5. Adjust the lens for best focus. ADJUSTMENT Vary the focus pack VR (Red, Blue) on the front cabinet. Adjust the TV for best possible focus around the center of the crosshatch pattern, without losing overall screen balance.
5-5-2 Lens Focus
PREPARATION 1. Do this adjustment after the static focus adjustment . 2. Select the � STANDARD� video mode. (Contrast: 64, Brightness: 32) 3. Input a cross hatch pattern. ADJUSTMENT 1. Loosen the lens screws. 2. Cover the two lenses that are not being adjusted. 3. Adjust the lens, observing the color aberration vertically and horizontally within 3 blocks of the center of the crosshatch pattern. 4. When the lens is turned clockwise, the color aberration will change as follows: Lens R G B Color Aberration Change Orange �- Crimson Blue �- Red Purple �- Green
Fig. 5-2 Crosshatch Pattern. Examine these points together
5. Green lens adjustment: Set the lens at the point where Blue just changes to Red. If the color aberration is irregular throughout the picture screen, adjust the lens to show Red within a 3-block grid around the horizontal center-line. Observe the the color aberration near the intersection points of the horizontal and vertical lines (approximately 1 - 3 mm area). If the aberration is irregular, adjust the lens as shown in the diagram below. (Accurate alignment of Green is important for overall color quality.) Fig. 5-3 Color Aberration 6. Set the Red lens at the point where Orange becomes Crimson. 7. Set the Blue lens at the point where Purple becomes Green.
