21
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.
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.
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].
3.
Confirm that the AGC voltage is 3./- 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.
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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V LIN
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V CENTRE
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PIN AMP
PIN PHASE
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