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Adjustment Of Video System; Video Level Adjustment (mb-103 Board); Checking S Video Output S-y; Checking S Video Output S-c - Sony DVP-NS305 Service Manual

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7-2. ADJUSTMENT OF VIDEO SYSTEM

1.

Video Level Adjustment (MB-103 BOARD)

<Purpose>
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or too small.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
LINE OUT (VIDEO) connector
(75 Ω terminated)
Instrument
Oscilloscope
Adjusting element
RV501
Specification
1.0
Adjusting method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Adjust the RV401 to attain 1.0
Fig.7-1.
2.

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.
Mode
Video level adjustment in test mode
Signal
Color bars
Test point
S VIDEO OUT (S-Y) connector
(75 Ω terminated)
Instrument
Oscilloscope
Specification
1.0 ± 0.05 Vp-p
Checking method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Confirm that the S-Y level is 1.0 ± 0.05 Vp-p.
Fig. 7-2.
+0.04
Vp-p
–0.02
+0.04
Vp-p.
–0.02
+0.04
1.0
Vp-p
–0.02
1.0 ± 0.05 Vp-p
3.

Checking S Video Output S-C

<Purpose>
This checks whether the S video output S-C satisfies the NTSC
standard. If it is not correct, the colors will be too dark or too light.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Confirm that the S-C burst is 286 ± 30 mVp-p
4.

Checking Component Video Output Y

<Purpose>
This checks component video output Y. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Confirm that the Y level is 1.0 ± 0.05 Vp-p.
7-2
Video level adjustment in test mode
Color bars
S VIDEO OUT (S-C) connector
(75 Ω terminated)
Oscilloscope
286 ± 30 mVp-p
286 ± 30 mVp-p
Fig. 7-3.
Video level adjustment in test mode
Color bars
COMPONENT VIDEO OUT (Y)
connector, D1 VIDEO OUT connector,
Pin 1 (75 Ω terminated)
Oscilloscope
1.0 ± 0.05 Vp-p
1.0 ± 0.05 Vp-p
Fig. 7-4.

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