Sony TRINITRON KV-25C5A Service Manual page 21

KV-25C5/29C5
Note: Ensure that no signal is applied to the Antenna socket while
carrying out the following IF adjustments.
TECHNICAL
SYSTEM B/G, D/K, 1 & L 1.F ADJUSTMENT
GD - Secam 30
: 1 Input a 38.9Mhz carrier signal at 100dBuV to Pin 11 [IF
BD - Secam 31 otic' ITU101}
RC-S 11 output] of the tuner ;
i aia _ 2. Measure the voltage at Pin 17 of [ICIOI].
eeean 3. Adjust L103 [A Board] to obtain a voltage of 2.5V 4/- 0.3V.
BC - Secam 10
SOspens SYSTEM L BAND 1 I.F ADJUSTMENT
BD - Sports 36
RC - Sports
14
1. Input a 34.0MHz carrier signal at 100dBuV to Pin 11 [IF
GC - Sports 15 output] of the tuner [TU101}.
BC - Sports 17 2. Select 'system L' + COO [channel 00].
Y - Delay (AV) 07 3. Measure the voltage at Pin 17 [IC101].
4. Adjust RV101 [A Board] to obtain a voltage of 2.5V +/- 0.3V.
SUB BRIGHTNESS ADJUSTMENT
: pe BUEN TUNER AGC ADJUSTMENT
difference between the 0 IRE and 10 IRE signal levels. Connect a voltmeter to SW130 [A Board].
Enter into the 'Test Menu'.
SUB CONTRAST ADJUSTMENT
Select the 'AGC Adjust' menu item.
Adjust the data using the Yellow and Green buttons on the
1. Input a video signal that contains a small 100% white area on a
black background
Remote Commander to obtain a voltage of 3.0V +/- 0.2V.
Set the picture control to maximum. ['TTO1']
Connect an oscilloscope to Pin 1 of CN504 [A Board].
Enter into the 'Picture' service menu.
Adjust the 'R - Drive' data to obtain the following waveform.
-
1 25" 2.21V +/- 0.01V
' 29" 2.52V +/- 0.01V
|
ra
Fe bo
ial Ne
R - out Waveform
SUB COLOUR ADJUSTMENT
Receive a PAL colour bar signal.
Connect an oscilloscope to Pin 3 of CN504 [A Board].
Enter into the 'Picture' service menu.
Adjust the 'Sub Colour' data so that the Cyan, Magenta and
Blue colour bars are of equal levels as indicated below.
aa da a
Same Level
A Board component side
B-Out Waveform
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