Electrical Adjustments
7Luminance adjustment adjustment [PC]
1.Receive the
2.Enter the service mode.
3.Measure luminance on the screen with the luminance meter. It is A for the reading of luminance meter.
4.Change the signal source to the
5.Select group no. “4”, Item no. “6” and change the Data value to make the reading of luminance meter to be A x 23%.
8A/D Ref. Voltage adjustment [Video]
1.Receive the
2.Enter the service mode.
3.Connect a digital voltmeter to test point “TPVRB” (+) and chassis ground
4.Select group no. “5”, Item no. “17” and adjust the volt- age to be 1.0 ±0.05Vdc by changing the Data value.
5.Connect a digital voltmeter to test point “TPGVRT (+) and chassis ground
6.Select Item no. “18” and adjust the voltage to be 2.5 ±0.05Vdc by changing the Data value.
10Pedestal adjustment [Video]
1.Receive the
2.Enter the service mode.
3.Connect an oscilloscope to test point “TP531” (+) and chassis ground
4.Select group no. “5”, Item no. “11” and adjust the black level to be maximum amplitude by changing the Data value.
5.Connect an oscilloscope to test point “TP501” (+) and chassis ground
6.Select Item no. “12” and adjust the black level to be maximum amplitude by changing the Data value.
7.Connect an oscilloscope to test point “TP561” (+) and chassis ground
8.Select Item no. “13” and adjust the black level to be maximum amplitude by changing the Data value.
Black Level
Pedestal Level
Note: This adjustment should be done after A/D Input adjustment [Video].
9A/D Input adjustment [Video]
1.Receive the
2.Enter the service mode.
3.Connect an oscilloscope to test point “TP13G” (+) and chassis ground
4.Select group no. “3”, Item no. “1” and adjust the ampli- tude “a” to be 1.35 ±0.1V by changing the Data value.
*This changes all the RGB amplitude at the same time. Item no. “2” can be adjusted for G only.
5.Connect an oscilloscope to test point “TP13B” (+) and chassis ground
6.Select Item no. “3” and adjust the amplitude “a” to be 1.35 ±0.1V by changing the Data value.
7.Connect an oscilloscope to test point “TP13R” (+) and chassis ground
8.Select Item no. “4” and adjust the amplitude “a” to be 1.35 ±0.1V by changing the Data value.
(a)
11Video Gain adjustment [Video]
1.Receive the
2.Enter the service mode.
3.Connect an oscilloscope to test point “TP531” (+) and chassis ground
4.Select group no. “4”, Item no. “3” and adjust the white level to be minimum amplitude by changing the Data value.
5.Connect an oscilloscope to test point “TP501” (+) and chassis ground
6.Select Item no. “4” and adjust the white level to be minimum amplitude by changing the Data value.
7.Connect an oscilloscope to test point “TP561” (+) and chassis ground
8.Select Item no. “5” and adjust the white level to be minimum amplitude by changing the Data value.
White Level
(a)