S Video Out Chroma Level Adjustment; (Vi-156 Board); Video Out Y, Chroma Level Check (Vi-156 Board) - Sony DSR-250 Service Manual

3. S VIDEO OUT Chroma Level Adjustment

(VI-156 board)

Mode Camera
Subject Arbitrary
Measurement Point Chroma signal terminal of S VIDEO
jack (75Ω terminated)
External trigger: Y signal terminal of
S VIDEO jack
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 26, 27
Specified Value Cr level:
Cb level:
Burst level: C = 286 ± 6mV(NTSC)
Adjusting method:
Order Page Address Data
1 0 01 01
2 2 35
3 2 35 01
4 3 0C 02
5 C 26
6 C 26
7 C 27
8 C 27
9
10 3 0C 00
11 2 35
12 0 01 00
0.28 µ sec (NTSC)
0.23 µ sec (PAL)
Fig. 5-3-9.
A = 714 ± 14mV(NTSC)
A = 700 ± 14mV(PAL)
B = 714 ± 14mV(NTSC)
B = 700 ± 14mV(PAL)
C = 300 ± 6mV(PAL)
Procedure
Set the data.
Note down the data.
Set the data.
Set the data, and press PAUSE
button.
Change the data and set the Cr
signal level (A) to the specified
value.
Press PAUSE button.
Change the data and set the Cb
signal level (B) to the specified
value.
Press PAUSE button.
Check that the burst signal level
(C) is satisfied the specified value.
Set the data, and press PAUSE
button.
Set the data that is noted down at
step 2.
Set the data.
H
A B
0.28 µ sec (NTSC)
0.23 µ sec (PAL)

4. VIDEO OUT Y, Chroma Level Check (VI-156 board)

Mode
Subject
Measurement Point
Measuring Instrument
Specified Value
Adjusting method:
Order Page Address Data
1 2 35
2 2 35
3 3 0C
4
5
6 3 0C
7 2 35
8 0 01
A
C
5-71
Camera
Arbitrary
VIDEO jack (75Ω terminated)
Oscilloscope
Sync level: A = 286 ± 18mV(NTSC)
A = 300 ± 18mV(PAL)
Burst level: B = 286 ± 18mV(NTSC)
B = 300 ± 18mV(PAL)
Procedure
Note down the data.
01 Set the data.
02 Set the data, and press PAUSE
button.
Check that the sync signal level
(A) satisfies the specified value.
Check that the burst signal level
(B) satisfies the specified value.
00 Set the data, and press PAUSE
button.
Set the data that is noted down at
step 1.
00 Set the data.
H
Fig. 5-3-10.
B