XV-Z21000 (serv.man4). Electrical Adjustments - Sharp Projector Service Manual (repair manual). Page 2

XV-Z20000/XV-Z21000/DT-5000

4 – 2

5-1

R-bright/contrast adjustment

1. Device: AD998417
2. Adjustment group: AD (RGB)
    (Process gamma linkage)
3. Adjustment item: R-BRIGHT
    Initial value: 40
    Adjustment item: R-D
    Initial value: 60
4. Input terminal: DVI A-RGB (Input switch-
    ing linkage)
5. Input signal: XGA
   Wind pattern having 100% (0.7 Vpp) R sig-
   nal and 0%

1. Observe the 0% portion.
2. Vary R-Bright (increment direction), and adjust to
    the point reduced by 1 point from the point where
    red bit dropout appears.
3. Observe the 100% portion.
4. Vary R-D (increment direction), and adjust to the
    point raised by 2 points from the point where red bit
    dropout appears.

5-2

G-bright/contrast adjustment

1. Device: AD998417
2. Adjustment group: AD (RGB)
    (Process gamma linkage)
3. Adjustment item: G-BRIGHT
    Initial value: 40
    Adjustment item: G-D
    Initial value: 60
4. Input terminal: DVI A-RGB (Input switch-
   ing linkage)
5. Input signal: XGA
    Wind pattern having 100% (0.7 Vpp) G
    signal and 0%

1. Observe the 0% portion.
2. Vary G-Bright (increment direction), and adjust to
    the point reduced by 1 point from the point where
    green bit dropout appears.
3. Observe the 100% portion.
4. Vary G-D (increment direction), and adjust to the
    point raised by 2 points from the point where green
    bit dropout appears.

5-3

B-bright/contrast adjustment

1. Device: AD998417
2. Adjustment group: AD (RGB)
    (Process gamma linkage)
3. Adjustment item: B-BRIGHT
    Initial value: 40
    Adjustment item: B-D
    Initial value: 60
4. Input terminal: DVI A-RGB (Input switch-
   ing linkage)
5. Input signal: XGA
   Wind pattern having 100% (0.7 Vpp) B sig-
   nal and 0%

1. Observe the 0% portion.
2. Vary B-Bright (increment direction), and adjust to
    the point reduced by 1 point from the point where
    blue bit dropout appears.
3. Observe the 100% portion.
4. Vary B-D (increment direction), and adjust to the
    point raised by 2 points from the point where blue
    bit dropout appears.

6-1

Component R-offset

1. Adjustment device: AD998417
2. Adjustment group: AD (COMP)
    (Process gamma linkage)
3. Adjustment item: CR-OFFSET
    Initial value: 50
4. Input terminal: DVI A-Component
    (Input switching linkage)
5. Input signal: Component 100% Ramp sig-
   nal

1. Vary CR-OFFSET, and place the red line appearing
    near the center over the green line.
2. The line color turns yellow.

6-2

Component B-offset
(Auto adjustment)

1. Adjustment device: AD998417
2. Adjustment group: AD (COMP)
    (Process gamma linkage)
3. Adjustment item: CB-OFFSET
    Initial value: 50
4. Input terminal: DVI A-Component
    (Input switching linkage)
5. Input signal: Component 100% Ramp sig-
   nal

1. Vary CB-OFFSET, and place the blue line over the
    line turning yellow by CR-OFFSET adjustment.
2. The line color turns white.

6-3

Component G-bright

1. Adjustment device: AD998417
2. Adjustment group: AD (COMP)
    (Process gamma linkage)
3. Adjustment item: G-BRIGHT
    Initial value: 70
4. Input terminal: DVI A-Component
    (Input switching linkage)
5. Component wind pattern having 100%
   (0.7 Vpp) G signal and 0%
6. Perform adjustment after adjusting CR-
   OFFSET and CB-OFFSET.

1. Observe the 0% portion.
2. Vary G-BRIGHT (decrement direction), and the
    screen starts to whiten.
3. Adjust to the point where no bit dropout is found
    and the screen becomes completely white.