Rough Adjustment Of Iris Ae; Rough Adjustment Of White Balance; Rough Adjustment Of Color Gain - Sharp VL-Z400H-T Service Manual

Item

(4) Rough adjustment of iris AE

• Measurement terminal:
S terminal luminance signal output
(75 Ω termination)
• Address: "0002" AE_CVT
• Measuring instrument:
Oscilloscope (horizontal cycle)
• Object:
Grey scale
• Data changing range:
"0000" to "00FE"

(5) Rough adjustment of white balance

• Measurement terminal:
EE output
• Address:
"0090" CGAIN_KR_W
"0092" CGAIN_KB_W
• Measuring instrument:
Vector scope
• Object:
Grey scale
• Data changing range:
"0000" to "03FF"

(6) Rough adjustment of color gain

• Measurement terminal:
EE output
• Address:
"0333" B-phase
"0334" Ye-phase
"0335" R-phase
"0338" R-Gain
"033A" B-Gain
"033B" Ye-Gain
• Measuring instrument:
Vector scope
• Object:
Color bar chart
• Data changing range:
"0000" to "00FF"
1) While shooting the gray scale normally, observe the video output using the oscilloscope.
By rewriting the data at address "0002", adjust the white luminance signal level to
680±10mVp-p and the gray luminance signal level (on the gray scale background) to
330±10mVp-p.
1) While shooting the gray scale normally, observe the monitoring screen of the vector
scope. By rewriting the data at addresses "0090" and "0092", position the luminescent
spot so that the following burst ratio is obtained.
R-Y 0 ± 5%
B-Y 0 ± 5%
1) Shoot the color bar chart and adjust the field angle so that the white level becomes
600mV. While observing the monitoring screen of the vector scope, rewrite the data
at addresses "0033", "0334", "0335", "0338", "033A" and "033B" so that the red, blue
and yellow luminescent spots are positioned as shown below. (As for the burst gain,
gain setting of the vector scope should be made at the 75% Amplitude point on the B-
Y axis.)
1.75 ± 0.1 time (burst ratio)
Red amplitude
1.35 ± 0.1 time (burst ratio)
Blue amplitude
1.25 ± 0.1 time (burst ratio)
Yellow amplitude
103° ± 2°
Red phase
358° ± 2°
Blue phase
168° ± 2°
Yellow phase
41
Adjustment method
Adjustment address
: "0338"
: "033A"
: "033B"
: "0335"
: "0333"
: "0334"
VL-Z400S-T/H-T
VL-Z500S-S/H-S/E-T/E-S
100mV/div