Service manual

45
VL-Z1U
Item
Adjustment method
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
720±10mVp-p and the gray luminance signal level (on the gray scale background) to
360±10mVp-p.
(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"
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 "0338", "033A", "0335", "0333", "033B" and "0334" 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.)
(6) Rough adjustment of color gain
• Measurement terminal:
EE output
• Address:
"0338" CGIN RYG
"033A" CGIN BYG
"0335" CMAT RYG
"0333" CMAT BYG
"033B" Yellow amplitude
"0334" Yellow phase
• Measuring instrument:
Vector scope
• Object:
Color bar chart
• Data changing range:
"0000" to "00FF"
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%
(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"
100mV/div
Adjustment address
Red amplitude 1.82 ± 0.1 time (burst ratio) : "0338"
Blue amplitude 1.52 ± 0.1 time (burst ratio) : "033A"
Yellow amplitude 1.18 ± 0.1 time (burst ratio) : "033B"
Red phase 103° ± 2° : "0335"
Blue phase 343° ± 2° : "0333"
Yellow phase 165° ± 2° : "0334"