JVC GY-DV500U Service Manual page 75

Measuring
No. Item instruments &
Input signals
AGC IN • Oscilloscope
2
BLACK (V-rate, 10:1)
adjustment or WFM
• Lens capped
or iris closed.
• Vectorscope
– C A M E R A A D J U S T M E N U – 3 / 6
A G C I N B L A C K < G > : O
A G C I N B L A C K < B > : O
A G C I N B L A C K < R > : O
D S P d a t a
< B c h > < G c h > < R c h >
0 0
– C A M E R A A D J U S T M E N U – 3 / 6
A G C I N B L A C K < G > : O
A G C I N B L A C K < B > : O
A G C I N B L A C K < R > : O
D S P d a t a
< B c h > < G c h > < R c h >
0 0
– C A M E R A A D J U S T M E N U – 3 / 6
A G C I N B L A C K < G > : O
A G C I N B L A C K < B > : O
A G C I N B L A C K < R > : O
D S P d a t a
< B c h > < G c h > < R c h >
0 0
NG
3-8
3-7
Mode
Adjustment
menu 3/6
GAIN SW H
(+18 dB)
0
0
0
Ensure that noise display is almost completely circular.
Measuring point (*)
Adjustment parts (-)
Adjustment level (+)
* TEST OUT
(1) Rotate the SHUTTER/MENU dial to select
(75 Ø terminated)
MENU 3/6: AGC IN BLACK <G>.
- SHUTTER/MENU
(2) Push the SHUTTER/MENU dial so that the ad-
dial
justment value blinks then rotate it to adjust to
+ Minimize V shading.
the specified level.
(3) Push the SHUTTER/MENU dial to store the
adjustment data in memory.
NG
GOOD
NG
+ Minimize V shading. (4) Rotate the SHUTTER/MENU dial to select
MENU 3/6: AGC IN BLACK <B>.
(5) Push the SHUTTER/MENU dial so that the ad-
justment value blinks then rotate it to adjust to
the specified level.
(6) Push the SHUTTER/MENU dial to store the
adjustment data in memory.
+ Minimize V shading. (7) Rotate the SHUTTER/MENU dial to select
MENU 3/6: AGC IN BLACK <R>.
(8) Push the SHUTTER/MENU dial so that the ad-
justment value blinks then rotate it to adjust to
the specified level.
(9) Push the SHUTTER/MENU dial to store the
adjustment data in memory.
(10) Check that the noise display on the
vectorscope is close to a true circle.
If the circle is distorted, repeat (1) to (9) until it
approaches a true circle.
(11) Set the GAIN SW to L (0dB).
GOOD
Adjustment procedure