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[PIP Circuit]
18. PIP fsc
Measuring
instrument
Test point
EXT trigger
Measurement
range
input signal
input terminal | RF IN terminal
Adjustment purpose
Set the clock frequency for PIP.
Symptom when
Interference or no color in the sub picture.
incorrectly adjusted
TP61
RF signal
PCB-PIP (COMPONENT SIDE)
GND
@
@
TP61
©
vc7001
{PIP Circuit]
Measuring
instrument
Test point
EXT trigger
Measurement
range
Input signal
Input terminal
19. PIP Chroma Gain
PCB-PIP (COMPONENT SIDE)
1C7002
Oscilloscope
TP63
| a
DIV 5mV
TIM 10ps
VIDEO signal
(color bar)
17002
Frequency counter
(standard broadcast)
Adjustment purpose
To set the color level between the main and sub pictures.
Symptom when
incorrectly adjusted
VIDEO IN terminal
1. Supply an RF signal (standard broadcast).
2. Display the standard broadcast in the sub picture screen.
Supply no signal for the main screen.
3. Observe the frequency at TP61.
4. Adjust VC7001 so that the frequency is 3.579545+0.000050MHz.
Different the color level between the main and sub pictures.
* Preheat the set for one minute or more.
1. Supply a VIDEO signal (color bar).
2. Press the "MENU" button on a remote hand unit.
3. Press the buttons "2", "3", "5" and "7" in that order.
(The screen will change to the circuit adjustment mode.)
4. Set the function to "PIP". ("AUDIO" button)
5. Set all the items in function "PIP" to the data values given on page 19.("VIDEQ"
and "ADJUST" buttons)
6. Observe the waveform at TP63.
7. Select item "1 COLR". ("VIDEO" button)
8. Set the data so that the chroma signal amplitude of sub picture is 90+5% of
main picture. ("ADJUST" button)
9. Write the data into memory. (Press "ENTER")
10. Terminate the circuit adjustment mode. (Press "MENU" twice)
Note: Adjustment 20 (PIP Sub Tint) must be performed immediately after this
adjustment.
Main Picture
= Sub Picture
=: Amplitude of
Amplitude of
Sub Picture
Main Picture
Waveform
—32-
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