Sony TRINITRON KV-X2581A Service Manual page 23

SUB BRIGHTNESS ADJUSTMENT
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Input a Phillips pattern.
Enter into service mode and press 23.
Adjust data so that 0-IRE of grey scale and
CUT-OFF 20-IRE are only slightly visible on screen.
SUB CONTRAST ADJUSTMENT
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Input a video that contains a small 100% area on
a Black Background.
Enter into service mode and press 01 to have
PIC max followed by 21.
Connect oscilloscope to pin qd) of CN703 (R OUT)
and adjust HWB Red data of TDA8366 1 to obtain
2.3Vp-p.
SUB COLOR ADJUSTMENT
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Input a PAL color bar signal.
Connect an oscilloscope to pin G3) of CN703
(B OUT) on the C board.
Enter into service mode and press 22.
Adjust data so that the right sides of the waveform
are set to the same level.
SAME LEVEL
B-OUT WAVEFORM
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STEREO SEPARATION ADJUSTMENT
Input a 1 KHz stereo signal to the L-ch and a 400Hz
stereo signal to the R-ch.
Enter into service mode and select the "Test Menu" to
be TDA6612. (TDA6622 UK models)
Select the Stereo Xtalk Adjustment Menu, by using
the Red (Next) and Green (Previous) buttons.
Monitor the Scart 1 L-channel output and adjust the data
so that the R-channel sound is not detected in the L-channel.
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.F. COIL ADJUSTMENT (T101) - B/G, D/K, | AND L
STANDARD FOR CONTINENTAL MODELS.
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Apply a 38.9MHz signal at 100dBuV to the input of
SWFIO1.
Receive a channel so that the I.C. is selected for negative
modulation.
Measure the voltage at the AFT test point and adjust
(T101) to obtain 2.4V +/- 0.2V.
1.F. COIL ADJUSTMENT (T101) - |, STANDARD
FOR U.K. MODELS.
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Apply a 39.5MHz signal at 100dBuV to the input of
SWFI101.
Receive a channel so that the I.C. is selected for negative
modulation.
Measure the voltage at the AFT test point and adjust
(T101) to obtain 2.4V +/- 0.2V.
L, BAND 1 ADJUSTMENT (RV102) - L, STANDARD
FOR FRENCH MODELS.
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Apply a 33.95MHz signal at 100dBuV to the input of
SWFI1O1.
Receive a channel so that the I.C. is selected for positive
modulation and system L band 1.
Measure the voltage at the AFT test point and adjust
(RV102) to obtain 2.4V +/- 0.2V.
Note : Only adjust RV102 after T101 has been correctly
adjusted.
AGC ADJUSTMENT
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Receive an off- air signal.
Enter the service mode, ("Test" "Test") and 35.
Adjust the data so that there is no snow or
cross - modulation visible on the screen.
Change the receiving off-air channel, and confirm
the above status.
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