Sony DVP-S7700 (serv.man2) Service Manual ▷ View online
7-2
7-2. Adjustment of System Control
1. System Clock 27 MHz Adjustment (MB-84 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.
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
Test point
IC206 8 pin
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.
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-84 board)
<Purpose>
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
LINE OUT (VIDEO) connector
(75
(75
Ω
terminated)
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
1) In the test mode initial menu “0” Syscon Diagnosis, set so that
Video Encoder (IC252) color bars are generated.
2) Adjust the RV251 to attain 1 ± 0.02 Vp-p.
Figure 7-2
2. S-terminal Output Check (MB-84 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 a S-
terminal cable.
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 Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
S VIDEO OUT (S-Y) connector
(75
(75
Ω
terminated)
Instrument
Oscilloscope
Specification
1 ± 0.05 Vp-p
Checking method:
1) In the test mode initial menu “0” Syscon Diagnosis, set so that
1) In the test mode initial menu “0” Syscon Diagnosis, set so that
Video Encoder (IC252) color bars are generated.
2) Confirm that the S-Y level is 1 ± 0.05 Vp-p.
Figure 7-3
3. Checking Component Video Output B-Y
(MB-84 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.
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
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
COMPONENT VIDEO OUT (B-Y)
connector (75
connector (75
Ω
terminated)
Instrument
Oscilloscope
Specification
700 ± 30 mVp-p
Checking method:
1) Confirm that the B-Y level is 700 ± 30 mVp-p.
1) Confirm that the B-Y level is 700 ± 30 mVp-p.
Figure 7-4
1 ± 0.05 Vp-p
700 ± 30 mVp-p
1 ± 0.02 Vp-p
7-3
4. Checking Component Video Output R-Y
(MB-84 board)
<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.
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
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
COMPONENT VIDEO OUT (R-Y)
connector (75
connector (75
Ω
terminated)
Instrument
Oscilloscope
Specification
700 ± 30 mVp-p
Checking method:
1) Confirm that the R-Y level is 700 ± 30 mVp-p.
1) Confirm that the R-Y level is 700 ± 30 mVp-p.
Figure 7-5
5. Checking Component Video Output Y
(MB-84 board)
<Purpose>
This checks component video output Y. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
This checks component video output Y. If it is incorrect, correct
brightness will not be attained when connected to, for instance,
projector.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
COMPONENT VIDEO OUT (Y)
connector (75
connector (75
Ω
terminated)
Instrument
Oscilloscope
Specification
1 ± 0.05 Vp-p
Checking method:
1) Confirm that the Y level is 1 ± 0.05 Vp-p.
1) Confirm that the Y level is 1 ± 0.05 Vp-p.
Figure 7-6
700 ± 30 mVp-p
1 ± 0.05 Vp-p
6. Checking RGB Output R
(MB-84 board) (AEP, UK model)
<Purpose>
This checks RGB output R. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
This checks RGB output R. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
EURO AV 1 (RGB)-TV connector
!∞ pin (75
!∞ pin (75
Ω
terminated)
Instrument
Oscilloscope
Specification
700 ± 30 mVp-p
Checking method:
1) Confirm that the R level is 700 ± 30 mVp-p.
1) Confirm that the R level is 700 ± 30 mVp-p.
Figure 7-7
7. Checking RGB Output G
(MB-84 board) (AEP, UK model)
<Purpose>
This checks RGB output G. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
This checks RGB output G. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
EURO AV 1 (RGB)-TV connector
!¡ pin (75
!¡ pin (75
Ω
terminated)
Instrument
Oscilloscope
Specification
700 ± 30 mVp-p
Checking method:
1) Confirm that the G level is 700 ± 30 mVp-p.
1) Confirm that the G level is 700 ± 30 mVp-p.
Figure 7-8
700 ± 30 mVp-p
700 ± 30 mVp-p
7-4
8. Checking RGB Output B
(MB-84 board) (AEP, UK model)
<Purpose>
This checks RGB output B. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
This checks RGB output B. If it is incorrect, pictures will not be
displayed correctly in spite of connection to the TV with an EURO
AV connecting cord.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
EURO AV 1 (RGB)-TV connector
7 pin (75
7 pin (75
Ω
terminated)
Instrument
Oscilloscope
Specification
700 ± 30 mVp-p
Checking method:
1) Confirm that the B-Y level is 700 ± 30 mVp-p.
1) Confirm that the B-Y level is 700 ± 30 mVp-p.
Figure 7-9
9. Checking S Video Output S-C (MB-84 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.
This checks whether the S-C satisfies the NTSC Standard. If it is
not correct, the colors will be too dark or light.
Mode
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
CN252 !™ pin
Instrument
Oscilloscope
Specification
286 ± 20 mVp-p
Connection:
Checking method:
1) Confirm that the S-C burst is 286 ± 20 mVp-p.
1) Confirm that the S-C burst is 286 ± 20 mVp-p.
Figure 7-10
700 ± 30 mVp-p
286 ± 20 mVp-p
10. Checking S Video Output DC Level (MB-84 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.
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
Video Encoder (IC252) check in test
mode menu “0” Syscon Diagnosis
mode menu “0” Syscon Diagnosis
Signal
Color bars
Test point
CN252 !™ pin
Instrument
Digital voltmeter
Specification
S-terminal 0 V: 0 Vdc
S-terminal 5 V: 5.0 Vdc
S-terminal 5 V: 5.0 Vdc
Connection:
Checking method:
1) In the test mode initial menu “0” Syscon Diagnosis, select S-
1) In the test mode initial menu “0” Syscon Diagnosis, select S-
terminal 0 V.
Confirm that the voltage at CN252 !™ pin is 0 Vdc.
Confirm that the voltage at CN252 !™ pin is 0 Vdc.
2) Press any key to select S-terminal 5 V.
Confirm that the voltage at CN252 !™ pin is 5.0 Vdc.
11
12
100
µ
F
75
Ω
±
1%
100k
±
1%
CN252
+
Oscilloscope
+0
–1.5
–1.5
11
12
100
µ
F
75
Ω
±
1%
100k
±
1%
CN252
+
Digital voltmeter
+0
–1.5
–1.5
7-6 E
7-4. Adjustment Related Parts Arrangement
MB-84 BOARD (Side A)
MB-84 BOARD (Side B)
HS-930SH BOARD (Side A)
RV251
CN251
9
1
VIDEO
LEVEL
LEVEL
ADJ
CT201
IC206
SYS CLK
(27 MHz) ADJ
(27 MHz) ADJ
8
14
7
1
25
1
2
24
CN252
CN201
1
4
6
8
8
9
11
12
14
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