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ADJUSTMENT OF Y/C CIRCUIT
l
Test point layout
n
ADJUSTMENT OF Y/C CIRCUIT
Adjustment of EE level
Measuring
Oscilloscope
instrument
Mode
Recording
Input signal
Standard colour bar
(stair-case waveform)
Test point
Pin 8 of IC201 (video output)
Adjusting point
R202 (EE level control)
Specification
2.0 + O.lVp-p (not terminated)
1. Set the unit in record mode.
2. Feed the colour bar signal to the video input
terminal. Observe the voltage of pin 8 of ~201
on the oscilloscope screen, adjust R202 (EE level
control) to obtain the value indicated in Figure 2-
5.
Figure 2-5.
Figure 2-4. Y/C PWB
Adjustment of white clip
Measuring
instrument
Mode
Input signal
Adjusting point
Specification
1.
Place the unit to the record mode.
2.
Feed the colour bar signal to the video input
terminal
3.
Turn R227 clockwise to maximum position.
4.
Observing the output at TP201, adjust R232
(white clip control) so that the white peak
overshoot be 80 + 4%.
5.
Make sure that the dark peak overshoot is 50 2
10%.
DARK
CLIP
50%
37
Oscilloscope
Recording
Standard colour bar
(stair-case waveform)
R232 (white clip control)
Figure 2-6.
.
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