Service manual

42
VL-AX1U
Item
Adjustment method
(1) Video output is observed with the oscilloscope in the grey scale standard record state,
the data of address "0002" is rewritten, and the luminance signal level is adjusted white
to 760 ± 10mVp-p, gray of the background 420 ± 10mVp-p.
(4) Iris AE coarse adjustment
• Measurement terminal:
S terminal luminance signal output
(75 Ω termination)
• Address: "0002" AE_CVT
• Measuring instrument:
Oscilloscope (horizontal sync)
• Object:
Grey scale
• Data variation width:
"0000" to "00FE"
(1) The color bar chart is imaged, and the picture angle is adjusted so as to get white level
700 mV. Indication on the vector scope is observed, the data of address "013A",
"013C", "0138", "0136", "07DE"and "07DD" are rewritten, and setting is made so that
the red, blue and yellow luminous dots are located in the following positions. (The gain
of vector scope must be set on 75% amplitude point on the B-Y axis.)
(6) Color gain coarse adjustment
• Measurement terminal:
EE output
• Address:
"013A" CGIN RYG
"013C" CGIN BYG
"0138" CMAT RYG
"0136" CMAT BYG
"07DE" Yellow
amplitude
"07DD" Yellow phase
• Measuring instrument:
Vector scope
• Object:
Color bar chart
• Data variation width:
"0000" to "00FF"
(1) Indication on the vector scope is observed in the grey scale standard record state,
data of address "0128" and "012A" are rewritten, and an adjustment is made so that
the luminous dot is located in the position of burst ratio:
R-Y 0 ± 5%
B-Y 0 ± 5%
(5) White balance coarse adjustment
• Measurement terminal:
EE output
• Address:
"0128" CGAIN_KR_W
"012A" CGAIN_KB_W
• Measuring instrument:
Vector scope
• Object:
Grey scale
• Data variation width:
"0000" to "03FF"
100mV/div
Adjustment address
Red amplitude 1.85 ± 0.1 time (burst ratio) : "013A"
Blue amplitude 1.50 ± 0.1 time (burst ratio) : "013C"
Yellow amplitude 1.35 ± 0.1 time (burst ratio) : "07DE"
Red phase 103° ± 2° : "0138"
Blue phase 358° ± 2° : "0136"
Yellow phase 164° ± 2° : "07DD"