Adjustment Of Video System; Video Level Adjustment; S-Terminal Output Check; Checking Composite Video Output B-Y - Sony dvp-s3000 Service Manual

7-4. Adjustment of Video System

1. Video Level Adjustment (MB-80 board)
<Purpose>
This adjustment is made to satisfy the NTSC Standard, and if not
adjusted correctly, the brightness will be too large or small.
CXD1914 (ENC) check in test mode
Mode
menu "0" Syscon Diagnosis
Signal Color bars
CN005 !¡ pin (terminating 75 )
Test point
Instrument Oscilloscope
Adjusting element RV479
Specification 1 ±0.02 Vp-p
Adjusting method:
1) In the test mode initial menu "0" Syscon Diagnosis, set so that
CXD1914 color bars are generated.
2) Adjust the RV479 to attain 1 ±0.02 Vp-p.
Figure 7-9
2. S-terminal Output Check (MB-80 board)
<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.
CXD1914 (ENC) check in test mode menu "0"
Mode
Syscon Diagnosis
Signal Color bars
CN005 7 pin (terminating 75 )
Test point
Instrument Oscilloscope
Specification 1 ±0.05 Vp-p
Checking method:
1) In the test mode initial menu "0" Syscon Diagnosis, set so that
CXD1914 color bars are generated.
2) Confirm that the S-Y level is 1 ± 0.05 Vp-p.
Figure 7-10
3. Checking Composite Video Output B-Y(MB-80 board)
<Purpose>
This checks composite video output B-Y. If it is incorrect, correct
colors will not be displayed when connected to, for instance, pro-
jector.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) Confirm that the B-Y level is 700 ±30 mVp-p.
1 ±0.05 Vp-p
4. Checking Composite Video Output R-Y(MB-80 board)
<Purpose>
This checks composite video output R-Y. If it is incorrect, correct
colors will not be displayed when connected to, for instance, pro-
jector.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) Confirm that the R-Y level is 700 ± 30 mVp-p.
1 ±0.05 Vp-p
7-4
CXD1914 (ENC) check in test mode menu "0"
Syscon Diagnosis
Color bars
CN005 1 pin (terminating 75 )
Oscilloscope
700 ±30 mVp-p
700 ±30 mVp-p
Figure 7-11
CXD1914 (ENC) check in test mode menu "0"
Syscon Diagnosis
Color bars
CN005 3 pin (terminating 75 )
Oscilloscope
700 ±30 mVp-p
Figure 7-12
700 ±30 mVp-p