Read Sony DVP-NC625 / DVP-NC665P / HT-6600DP Service Manual online
7-2
7-2. ADJUSTMENT OF VIDEO SYSTEM
1.
Video Level Adjustment (MB-108 Board)
<Purpose>
This adjustment is made to satisfy the NTSC/PAL standard, and if
not adjusted correctly, the brightness will be too large or small.
This adjustment is made to satisfy the NTSC/PAL standard, and if
not adjusted correctly, the brightness will be too large or small.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
LINE OUT (VIDEO) connector
(75
(75
Ω terminated)
Instrument
Oscilloscope
Adjusting element
NC615: RV401, NC655P: RV501
Specification
1.0
+0.04
Vp-p
–0.02
Adjusting method:
1)
1)
In the test mode initial menu “6” Video Level Adjustment, set
so that color bars are generated.
so that color bars are generated.
2)
Adjust the RV501 to attain 1.0
+0.04
Vp-p.
–0.02
Fig. 7-1.
Fig. 7-2.
3.
Checking S Video Output S-Y
<Purpose>
Check S-terminal video output. If it is incorrect, pictures will not
be displayed correctly in spite of connection to the TV with a S-
terminal cable.
Check S-terminal video output. If it is incorrect, pictures will not
be displayed correctly in spite of connection to the TV with a S-
terminal cable.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
S VIDEO OUT (S-Y) connector
(75
(75
Ω terminated)
Instrument
Oscilloscope
Specification
1.0 ± 0.05 Vp-p
Checking method:
1)
1)
In the test mode initial menu “6” Video Level Adjustment, set
so that color bars are generated.
so that color bars are generated.
2)
Confirm that the S-Y level is 1.0 ± 0.05 Vp-p.
Fig. 7-3.
4.
Checking S Video Output S-C
<Purpose>
This checks whether the S-C satisfies the NTSC/PAL standard. If it
is not correct, the colors will be too dark or light.
This checks whether the S-C satisfies the NTSC/PAL standard. If it
is not correct, the colors will be too dark or light.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
S VIDEO OUT (S-C) connector
(75
(75
Ω terminated)
Instrument
Oscilloscope
Specification
A = 286 ± 30 mVp-p (NTSC)
A = 300 ± 100 mVp-p (PAL)
A = 300 ± 100 mVp-p (PAL)
Checking method:
1)
1)
In the test mode initial menu “6” Video Level Adjustment, set
so that color bars are generated.
so that color bars are generated.
2)
Confirm that the S-C burst is “A”.
Fig. 7-4.
1.0 Vp-p
+0.04
–0.02
–0.02
1.0 ±0.05 Vp-p
A
2.
Progressive Video Output Level Adjustment
(MB-108 Board)
(MB-108 Board)
<Purpose>
This adjusts progressive video output level. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
This adjusts progressive video output level. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
COMPONENT VIDEO OUT (Y)
connector (75
connector (75
Ω terminated)
Instrument
Oscilloscope
Adjusting element
RV502
Specification
1.0
+0.04
Vp-p
–0.02
Adjusting method:
1)
1)
In the test mode initial menu “7” Prog Level Adjustment, set
so that color bars are generated.
so that color bars are generated.
2)
Confirm that the Y level is 1.0
+0.04
Vp-p.
–0.02
1.0 Vp-p
+0.04
–0.02
–0.02
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