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Very nice and real Service Manual, I didn't thought it actually exist in the real world at all.
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Input Signal Step
Adjust the black level of Red and Blue signals to reference with black level of Green signal
Adjusting Method
Adjust the signal amplitude of Red and Blue signals to reference with signal amplitude of Green signal
Green signal waveform Green signal waveform
Red or Blue signal waveform
Signal amplitude of Green signal
Red or Blue signal waveform
Black level of Green signal
Video signal
Black level of Red or Blue signal
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Increase three steps of MAT CONT adjustment value of OFFSET-RGB1. OFFSET mode: Select the RGB 1 mode by top and bottom keys MAT CONT : 1 key Increase three steps of adjustment value by right and left keys. Increase two steps of MAT BRIGHT adjustment value of OFFSET-RGB1. OFFSET mode: Select the RGB 1 mode by top and bottom keys MAT BRIGHT : 2 key Increase two steps of adjustment value by right and left keys. Turn ACL SW setting to ON. INITIALIZE mode ACL SW : 3 key Select ON by right and left keys. Input a RGB (PC) signal to INPUT1 or INPUT2. A signal pattern is only luminance signal such as lamp signal and a STEP signal. And use the signal which black level (0IRE) and gradation can confirm. � Recommended signal: VESA VGA@60Hz
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2 3 4 RGB (PC) signal 5
Turn to standby once, and perform power supply ON with the factory mode once again. MENU � SET � POWER ON Take a trigger of oscilloscope with HD_PLL (3.3Vp-p) of K4805. Measure the signal waveform of Green signal at K4603, and measure the black level (0IRE) of signal and signal amplitude. AD R LOW adjustment Measure the black level (0IRE) of Red signal at K4602, and adjust so that the level of AD R LOW to match the black level (0IRE) of Green signal which measured with step 10 of video signal. Adjustment error: ± 0.05V OFFSET mode: Select the RGB 1 mode by top and bottom keys AD R LOW : 9 key Adjust by right and left keys. AD R HIGH adjustment Measure the signal amplitude of Red signal at K4602, and adjust so that the level of AD R HIGH to match the signal amplitude of Green signal which measured with step 10 of video signal. Adjustment error: ± 0.05V OFFSET mode: Select the RGB 1 mode by top and bottom keys AD R HIGH : 6 key Adjust by right and left keys.
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