Adjustment Of System Control; System Clock 27 Mhz Adjustment; Adjustment Of Video System; Interface Video Output Level Adjustment - Sony RMT-D122A Service Manual

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7-2. ADJUSTMENT OF SYSTEM CONTROL

1. System Clock 27 MHz Adjustment (VP-52 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
Test point CN103 pin 1
Instrument Digital voltmeter
Adjusting element CT101
Specification 2.5 ± 0.1 V
Adjusting method:
1) Adjust CT101 to attain 2.5 ± 0.1 V.

7-3. ADJUSTMENT OF VIDEO SYSTEM

1. Interface Video Output Level Adjustment

(VP-52 BOARD)
<Purpose>
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Mode Video level adjustment in test mode
Signal Color bars
TE
L 13942296513
VIDEO OUT connector
Test point
(75 Ω terminated)
Instrument Oscilloscope
Adjusting element RV102
Specification 1.00
Adjusting method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Adjust the RV102 to attain 1.00
Figure 7-1
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+ 0.04
Vp-p
– 0.02
+ 0.04
Vp-p.
– 0.02
+ 0.04
1.00 Vp-p
– 0.02
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2. S-terminal Output Check

<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
Signal
Test point
Instrument
Specification
Checking method:
1) Confirm that the S-Y level is 1.00 ± 0.05 Vp-p.

3. Checking Component Video Output B-Y

<Purpose>
This checks component video output B-Y. If it is incorrect, correct
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colors will not be displayed when connected to, for instance, pro-
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jector.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) Confirm that the B-Y level is 700 ± 50 mVp-p.
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Video level adjustment in test mode
Color bars
S VIDEO OUT (S-Y) connector
(75 Ω terminated)
Oscilloscope
1.00 ± 0.05 Vp-p
1.00 ± 0.05 Vp-p
Figure 7-2
1 5 0 5 8 2 9 9 4
Video level adjustment in test mode
Color bars
COMPONENT VIDEO OUT (B-Y)
connector (75 Ω terminated)
Oscilloscope
700 ± 50 mVp-p
700 ± 50 mVp-p
Figure 7-3
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