MITAC PA020
Manual de Servicio

[ Method using light-meter ] (1) Adjust [V-COM] again. (2) Set a light-meter with analog output terminal at the screen center and observe waveform of the analog output using an oscilloscope. (3) Open Menu [DDIC] [Flat Field / DD Ctrl], and turn [R Mute], [G Mute], [B Mute] to [On]. (4) Open Menu [Gain/Setup] and click [Gain]. Record the data of [R], [G] and [B] at this time. (5) Set all phases of [R], [G] and [B] of [Gain] to 0. (6) Open Menu [Flat Field / DD Ctrl] and set [R] Flat Field level to 500, then [G] and [B] to 0, respectively. (7) Open Menu [Gain/Setup] and click [Gain]. Return the 0-PHASE of [Gain] to the data recorded in 4) above. (8) Click [DC Setup]. Using an oscilloscope, observe the waveform of the flicker. Then adjust the 0-PHASE so that the amplitude of the flicker is reduced to a minimum. (9) Click [GAIN] and set the 0-PHASE to 0. (10) In the same manner as for above, adjust 1-PHASE to 7-PHASE. (11) In the same manner as for the steps 6)-10) above, adjust [G] and [B]. (12) Open [DDIC] [GAIN] and return the value of [GAIN] to the value recorded in 4) above. (13) Adjust V-COM again. G BLACK 8 BARS ADJUSTMENT (1) Supply a G gray-scale signal. (2) Open Menu [DDIC] [Gain/Setup], then click [G] and [Setup]. (3) Observe the darkest gradation with vertical stripes and the lighter portions (1-2 lighter gradations) from the darkest gradation. Then adjust the phase with the adjustment cursor so that the vertical stripes are reduced to a minimum. (Adjust each phase separately after turning [ALL] off.) Note : Set [Separate A and B] to off, then adjust [A-line] and [B-line] at the same time. G WHITE 8 BARS ADJUSTMENT (1) Supply a G gray-scale signal. (2) Open Menu [DDIC] [Gain/Setup], then click [G] and [Gain]. (3) Observe the lightest gradation with vertical stripes and the darker portions (1-2 darker gradations) from the lightest gradation. Then adjust the phase with the adjustment cursor so that the vertical stripes are reduced to a minimum. (Adjust each phase separately after turning [ALL] off.) Note : Set [Separate A and B] to off, then adjust [A-line] and [B-line] at the same time. R ADJUSTMENT (1) In the same manner as for G Black 8 bars and G white 8 bars adjustments, adjust R. B ADJUSTMENT (1) In the same manner as for G Black 8 bars and G white 8 bars adjustments, adjust B.

(No.PA020)1-13