Adjustment Of Video System; Video Level Adjustment (Mb-99 Board); Checking S Video Output S-Y; Checking S Video Output S-C - Sony DVP-F21 Service Manual

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7-2. ADJUSTMENT OF VIDEO SYSTEM

1. Video Level Adjustment (MB-99 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.
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.
+0.04
2) Adjust the level to 1.0
–0.02
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Figure 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 an 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
1.0 ± 0.05 Vp-p
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-Y level is 1.0 ± 0.05 Vp-p.
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Figure 7-2
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+0.04
Vp-p
–0.02
Vp-p by RV501.
+0.04
1.0 Vp-p
–0.02
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1.0±0.05Vp-p
y
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3. 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.
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 "A" meets the specification.
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7-3. ADJUSTMENT RELATED PARTS
ARRANGEMENT
MB-99 BOARD (SIDE A)
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Video level adjustment in test mode
Color bars
S VIDEO OUT (S-C) connector
(75 Ω terminated)
Oscilloscope
A = 286 ± 30 mVp-p (NTSC)
A = 300 ± 100 mVp-p (PAL)
A
Figure 7-3
1 5 0 5 8 2 9 9 4
RV501
V-ADJ
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9 9
2 8 9 9