Read Sony KV-21LS30B Service Manual online
20
Sub Colour Adjustment
1.
Receive a PAL colour bar signal.
2.
Connect an oscilloscope to Pin 5 of CN003 [A Board].
3.
Enter into the ‘Service’ service menu.
4.
Adjust the ‘Sub Colour’ data so that the Cyan, Magenta and
Blue colour bars are of equal levels as indicated below.
Blue colour bars are of equal levels as indicated below.
Same Level
B-Out Waveform
Tuner AGC Adjustment
Note:
There should be no need to adjust the AGC as this is pre-
adjusted during manufacture of the FRONTEND. If the AGC
does need adjustment then follow steps 1. to 4. below.
adjusted during manufacture of the FRONTEND. If the AGC
does need adjustment then follow steps 1. to 4. below.
1. Receive a signal of 62dBuV / 75 ohm terminated via the tuner
antenna socket.
2.
Connect a voltmeter to pin1 of TU101 [print side of A Board]
or to the AGC pin of CN001 [mount side of A Board].
or to the AGC pin of CN001 [mount side of A Board].
3.
Confirm that the AGC voltage is 3.5volts +/- 0.3volts.
4.
If adjustment is required, then re-adjust the AGC variable
resistor (located at the top rear of the FRONTEND) to obtain
a voltage of 3.5V +/- 0.3V.
resistor (located at the top rear of the FRONTEND) to obtain
a voltage of 3.5V +/- 0.3V.
1.
Enter into the ‘Geometry’ service menu.
2.
Select and adjust each item in order to obtain the optimum image.
[ Print side of A board ]
Deflection System Adjustment
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