Checking S Video Output S-C; Checking S Video Output Dc Level - Sony DVP-S300 Service Manual

4. Checking Component Video Output R-Y
(MB-78 board) (DVP-S315 only)
<Purpose>
This checks component video output R-Y. If it is incorrect, cor-
rect colors will not be displayed when connected to, for instance,
projector.
Mode CXD1914 (ENC) check in test mode
menu "0" Syscon Diagnosis
Signal Color bars
CN251 8 pin (terminating 75 Ω)
Test point
Instrument Oscilloscope
Specification 700 ± 30 mVp-p
Checking method:
1) Confirm that the R-Y level is 700 ± 30 mVp-p.
(NTSC)
Figure 7-5
5. Checking Component Video Output Y
(MB-78 board) (DVP-S315 only)
<Purpose>
This checks component video output Y. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
CXD1914 (ENC) check in test mode
Mode
menu "0" Syscon Diagnosis
Signal Color bars
CN251 6 pin (terminating 75 Ω)
Test point
Instrument Oscilloscope
Specification 1 ± 0.05 Vp-p
Checking method:
1) Confirm that the Y level is 1 ± 0.05 Vp-p.
(NTSC)
Figure 7-6
700 ± 30 mVp-p
(PAL)
1 ± 0.05 Vp-p
(PAL)
6. Checking S Video Output S-C (MB-78 board)
<Purpose>
This checks whether the S-C satisfies the NTSC Standard. If it is
not correct, the colors will be too dark or light.
Mode
Signal
Test point
Instrument
Specification
Connection:
100µF
+
75Ω
100k
±1%
±1%
Checking method:
1) Confirm that the S-C burst is 286 ±20 mVp-p.
7. Checking S Video Output DC Level (MB-78 board)
<Purpose>
This checks signals for S1 and S2 compatible TV. If they are not
correct, the TV will not switch automatically to letter box, etc.
Mode
Signal
Test point
Instrument
Specification
Connection:
100µF
+
75Ω 100k
±1% ±1%
Checking method:
1) In the test mode initial menu "0" Syscon Diagnosis, select S-
terminal 0 V.
Confirm that the voltage at CN252 !™ pin is 0 V.
2) Press any key to select S-terminal 5V.
Confirm that the voltage at CN252 !™ pin is 5.0
7-3
CXD1914 (ENC) check in test mode
menu "0" Syscon Diagnosis
Color bars
CN252 !™ pin
Oscilloscope
286 ± 20 mVp-p
CN252
12 Oscilloscope
11
286 ± 20 mVp-p
Figure 7-7
CXD1914 (ENC) check in test mode
menu "0" Syscon Diagnosis
Color bars
CN252 !™ pin
Digital voltmeter
S-terminal 0V: 0V
+0
S-terminal 5V: 5.0 V
–1.5
CN252
12 Digital voltmeter
11
+0
–1.5
V.