Adjustment Of Video Signal - JVC TK-C400E Service Manual

Measuring
No. instrument &
Item
Input signals

2.8 ADJUSTMENT OF VIDEO SIGNAL

1 White clip Oscilloscope
adjustment (H-rate: 10:1) or
W.F.M.
Gray scale chart
(Just scan size)
2 Contour level Oscilloscope
adjustment (H-rate: 10:1) or
W.F.M.
Gray scale chart
(Just scan size)
Measuring point (*)
Adjustment parts (-)
Mode
Adjustment level (+)
* VIDEO OUT (75 ohm
Termination)
- DAVREFY
LENS OPEN
[CAT: DCREF, Byte: 1]
+
U-ver. 0.79 Vp-p (110 IRE)
E-ver. 0.77 Vp-p (110%)
* VIDEO OUT (75 ohm
Termination)
- LENS IRIS
+
U-ver. 0.57 Vp-p (80IRE)
E-ver. 0.56 Vp-p (80%)
* VIDEO OUT (75 ohm
Termination)
- VHAPGH
[CAT: FIELD, Byte: 3]
+
U-ver. 0.714 Vp-p (100IRE)
E-ver. 0.7 Vp-p (100%)
Adjustment procedure
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 " " and " " but-
tons to obtain the specified level at the meas-
uring point.
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.
3) Adjust the VHAPGH with " " and " " but-
tons to obtain the specified level at the meas-
uring point.
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