JVC TK-C720TPE, Руководство по обслуживанию

Страница: 13 / 48

2-7
Item Mode Adjustment procedure
Measuring
instrument &
Input signals
No.
Measuring point (
*
)
Adjustment parts (
-
)
Adjustment level (
+
)
2.8 ADJUSTMENT OF VIDEO SIGNAL
1 White clip
adjustment
*
MONITOR OUT
(75 ohm Termination)
-
LENS IRIS
-
DAVREFY
[CAT: DCREF, Byte: 1]
1) Select the “NEXT” button to display “Con-
tour level” on the title bar.
2) Adjust the lens iris to obtain the specified level
at the measuring point.
1) Select the “NEXT” button to display “White
clip” on the title bar.
2) Turn the lens iris so that the wavefrom of
grayscele is saturated as shown left figure.
3) Adjust the DAVREFY with “
䊱
” and “
䊲
” but-
tons to obtain the specified level at the meas-
uring point.
2 Contour level
adjustment
*
MONITOR OUT
(75 ohm Termination)
-
LENS IRIS
U-ver.
E-ver.
0.79 Vp-p (110 IRE)
0.77 Vp-p (110%)
+
Oscilloscope
(H-rate: 10:1) or
W.F.M.
Gray scale chart
(Just scan size)
U-ver.
E-ver.
0.57 Vp-p (80IRE)
0.56 Vp-p (80%)
+
U-ver.
E-ver.
0.714 Vp-p (100IRE)
0.7 Vp-p (100%)
+
*
MONITOR OUT
(75 ohm Termination)
-
VHAPGH
[CAT: FIELD, Byte: 3]
Oscilloscope
(H-rate: 10:1) or
W.F.M.
Gray scale chart
(Just scan size)
3) Adjust the VHAPGH with “
䊱
” and “
䊲
” but-
tons to obtain the specified level at the meas-
uring point.