JVC TK-C675BU Service Manual page 15

Measuring
No. Item instrument &
Input signals
4 Y setup • Oscilloscope
adjustment (H-rate, 10:1)
5 White clip • Gray scale chart
adjustment (Just scan)
• Oscilloscope
(H-rate, 10:1)
0.785 Vp-p
(U Ver.)
0.77 Vp-p
(E Ver.)
6 AGC set • Gray scale chart
adjustment (Just scan)
• Oscilloscope
(H-rate, 10:1)
0.678 Vp-p
(U Ver.)
0.665 Vp-p
(E Ver.)
Measuring point (
Adjustment parts (
Mode
Adjustment level (
VIDEO output
22h (Y setup level)
30mVp-p
30 mVp-p
VIDEO output
37h (White clip level)
<U Ver.>
0.785Vp-p
<E Ver.>
0.77Vp-p
VIDEO output
LENS IRIS
<U Ver.>
0.643Vp-p [90 IRE]
<E Ver.>
0.63Vp-p
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
VIDEO output
39h (AGC normal
reference)
<U Ver.>
0.678Vp-p [95 IRE]
<E Ver.>
0.665Vp-p
)
)
Adjustment procedure
)
1) Close the lens iris.
2) Adjust the Y set up level data so that setup
level is 30mVp-p. (From the pedestal level)
1) Attach the infinity adjustment lens with gray
scale chart to the lens.
2) Open the lens iris.
3) Adjust the white clip level data so that the
white peak of gray scale chart is following
specified level at VIDEO output.
NOTE
When the carrier level of the white clip ex-
ceeds 100mVp-p, use the menu command
[Edit] after completing white clip adjustment
in order to move the 26(Vsub) data and bring
the carrier level to a minimum.
1) Set lens iris so that the white level in the
center of the gray scale chart at VIDEO out-
put is 0.643Vp-p [90 IRE] or 0.63Vp-p (E Ver.).
2) Click "OK". The camera's AGC mode is
switched automatically to 20 dB.
3) Adjust the AGC normal reference data so that
the white level in the center of the gray scale
chart at VIDEO output is 0.678Vp-p [95 IRE]
(U Ver.) or 0.665Vp-p (E Ver.). (After this ad-
justment, the AGC mode is switched auto-
matically to OFF.)
NOTE
As the output has hysteresis, decrease the
white level to below -95 IRE before starting
the adjustments.
2-6