7-2
1.0 Vp-p
+0.04
–0.02
1.0 ±0.05 Vp-p
A
1.0 Vp-p
+0.04
–0.02
7-2. ADJUSTMENT OF VIDEO SYSTEM
1. Video Level Adjustment (MB-118 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
+0.04
Vp-p
–0.02
Adjusting method:
1) In the test mode initial menu “6” Video Level Adjustment, set
so that color bars are generated.
2) Adjust the RV501 to attain 1.0
+0.04
Vp-p.
–0.02
Fig. 7-1.
2. Progressive Video Output Level Adjustment
(MB-118 Board)
<Purpose>
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 Ω terminated)
Instrument Oscilloscope
Adjusting element RV502
Specification 1.0
+0.04
Vp-p
–0.02
Adjusting method:
1) In the test mode initial menu “7” Prog Level Adjustment, set
so that color bars are generated.
2) Confirm that the Y level is 1.0
+0.04
Vp-p.
–0.02
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.
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. 7-3.
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.
Mode Video level adjustment in test mode
Signal Color bars
Test point S VIDEO OUT (S-C) connector
(75 Ω terminated)
Instrument Oscilloscope
Specification A = 286 ± 30 mVp-p (NTSC)
A = 300 ± 100 mVp-p (PAL)
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”.
Fig. 7-4.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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