Adjustment Of System Control; System Clock 27 Mhz Adjustment; Adjustment Of Video System; Video Level Adjustment - Sony DVP-S715 Service Manual

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7-2. Adjustment of System Control

1. System Clock 27 MHz Adjustment (MB-78 board)
<Purpose>
27 MHz is the reference clock for the MPEG system, and if it is
not adjusted correctly, checking of 22 MHz and 33 MHz lock in
the following steps will result in NG.
Mode
E-E
IC206 8 pin
Test point
Instrument
Oscilloscope, Frequency counter
Adjusting element
CT201
Specification
27000000 ± 100 Hz
Adjusting method:
1) Confirm that the waveform at TP018 is normal.
2) Adjust CT201 to attain 27000000 ± 100 Hz.
Figure 7-1

7-3. Adjustment of Video System

1. Video Level Adjustment (MB-78 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
Test point
LINE OUT (VIDEO) connector
(terminating 75 Ω)
Instrument
Oscilloscope
Adjusting element
RV251
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 RV251 to attain 1 ± 0.02 Vp-p.
Figure 7-2
2. S-terminal Output Check (MB-78 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.
Mode
Signal
Test point
Instrument
Specification
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.
3. Checking Component Video Output B-Y
(MB-78 board)
<Purpose>
This checks component video output B-Y. If it is incorrect, cor-
rect colors will not be displayed when connected to, for instance,
projector.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) Confirm that the B-Y level is 700 ± 30 mVp-p.
1 ± 0.02 Vp-p
7-2
CXD1914 (ENC) check in test mode
menu "0" Syscon Diagnosis
Color bars
S VIDEO OUT connector
(terminating 75 Ω)
Oscilloscope
1 ± 0.05 Vp-p
Figure 7-3
CXD1914 (ENC) check in test mode
menu "0" Syscon Diagnosis
Color bars
EURO AV 1 (RGB)-TV connector
7 pin (terminating 75 Ω)
Oscilloscope
700 ± 30 mVp-p
700 ± 30 mVp-p
(NTSC)
(PAL)
Figure 7-4
1 ± 0.05 Vp-p

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