Sharp TU-GD10U-T Service Manual page 27

4. Adjustment Procedure
4-1. VLS BIAS (15V) voltage adjustment
Go to "VLS BIAS" with the cursor (UP/DOWN) keys and select the value with the cursor (LEFT/RIGHT)
keys.
Connect a digital voltage meter to TP4827 (TL4843) on the LCD_CONT_TOP PWB and adjust the value
with the cursor (UP/DOWN) keys to 15.00V±0.05V.
4-2. GRAY LEVEL (14.2V) voltage adjustment
Go to "GRAY LEVEL" with the cursor (UP/DOWN) keys and select the value with the cursor (LEFT/
RIGHT) keys.
Connect a digital voltage meter to TP4501 (TL4501) on the LCD_CONT_TOP PWB and adjustt a value
with the cursor (UP/DOWN) keys to 14.20V±0.05V.
Make sure to adjust the value accurately as this power supply voltage will be used as a reference voltage
for the gradation voltage.
4-3. COM BIAS adjustment
Shift to the [COM BIAS] item with the cursor UP/DOWN key and select a numeric value with the cursor
RIGHT/LEFT key.
Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. Make an
adjustment so that the flicker near the center of the screen is minimized.
4-4. Background adjustment
(1) Connect the AVC center and monitor for the background adjustment.
(2) Display the adjustment confirmation screen (gray scale).
(3) Go to "PATTERN" with the cursor (UP/DOWN) keys and press "ENTER".
Go to "PATTERN PAGE2" with the cursor (DOWN) key.
(4) Adjust ADJ to 6 and press "ENTER".
(5) Set the 6th point to the designated gradation and adjust RGB to obtain the standard value for the 6th
point.
(6) Set the 1st point to the designated gradation and calculate the G set value of the 1st point using the
following formula: G initial value of the 1st point x (G adjustment value of the 6th point/928) (rounding off
fractions). Then adjust RB to obtain the standard value of the 1st point.
(7) Set the 2nd point to the designated gradation and calculate the G set value of the 2nd point using the
following formula: G initial value of the 2nd point x (G adjustment value of the 6th point/928) (rounding off
fractions). Then adjust RB to obtain the standard value of the 2nd point.
(8) Set the 3rd point to the designated gradation and calculate the G set value of the 3rd point using the
following formula: G initial value of the 3rd point x (G adjustment value of the 6th point/928) (rounding off
fractions). Then adjust RB to obtain the standard value of the 3rd point.
(9) Set the 4th point to the designated gradation and calculate the G set value of the 4th point using the
following formula: G initial value of the 4th point x (G adjustment value of the 6th point/928) (rounding off
fractions). Then adjust RB to obtain the standard value of the 4th point.
(10) Set the 5th point to the designated gradation and calculate the G set value of the 5th point using the
following formula: G initial value of the 5th point x (G adjustment value of the 6th point/928) (rounding off
fractions). Then adjust RB to obtain the standard value of the 5th point.
(11) Adjust CALC to 1 and calculate. Confirm that the adjustment has been made correctly to exit.
[North America]
Standard value 1: x=0.295, y=0.305 [Minolta CA-110] (216 gradations)
Standard value 2: x=0.295, y=0.305 [Minolta CA-110] (352 gradations)
Standard value 3: x=0.295, y=0.305 [Minolta CA-110] (528 gradations)
Standard value 4: x=0.295, y=0.305 [Minolta CA-110] (656 gradations)
Standard value 5: x=0.295, y=0.305 [Minolta CA-110] (800 gradations)
Standard value 6: x=0.291, y=0.300 [Minolta CA-110] (928 gradations)
27
TU-GD10U-T
TU-45GAD/T
LC-45GX6U/D/T