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LUMINANCE SIGNAL OUTPUT LEVEL ADJUSTMENT
Measuring Instruments Signal generator (NTSC 75% color bar signal)
Oscilloscope
Test Points CN001 pin 1 (Y Output)
Adjustment Points VR101 (VBS AMP VR), VR102 (Y AMP VR)
[Preparation] Supply power to the following connector (CN001) pins using a DC power supply, extension cable, etc.
1. Apply the NTSC color bar signal to Terminal VIDEO1.
2. Connect the oscilloscope across CN001 pin 1 and GND.
3. Adjust VR101 so that the voltage at <A> in the figure on the right is
0.525 V ± 0.015 V.
4. Apply the HIGH level (3 to 5 V DC) to CN001 pin 5 and switch to the Y/C input.
5. Apply the NTSC color bar signal to terminal Y/C.
6. Adjust VR102 so that the voltage at <A> in the figure on the right is
0.525 V ± 0.015 V.
ADJUSTMENTS OF NTSC/PAL VIDEO INPUT CARD (BT-YA701P)
NTSC (3.58 MHz) COLOR SYNC ADJUSTMENT
Measuring Instruments Signal generator (NTSC 75% color bar signal)
Oscilloscope
Test Points CN001 pin 1 (Y Output)
CN001 pin 2 (B-Y output)
Adjustment Points VR303 (NTSC COLOR VR), S301 (APC SW), TC304 (NTSC PHASE TRIM)
[Preparation] Supply power to the following connector (CN001) pins using a DC power supply, extension cable, etc.
1. Apply the NTSC color bar signal to Terminal VIDEO1.
2. Connect CH1 of the oscilloscope to CN001 pin 1 and CH2 to CN001 pin 2.
3. While obtaining synchronization with the H sync with CH1, adjust VR303 so that the CH2 waveform becomes as shown in (A) in the figure shown
below.
4. Set S301 to S (Service).
5. Adjust TC304 so that the CH2 waveform changes from (A) to (B) in the following figure. Waveform (B) should be almost stationary.
6. Set S301 to N (Normal) and ensure that the CH2 waveform is stationary.
CN001 pins 45, 46 14 V DC ± 1 V
CN001 pins 47, 48 7 V DC ± 1 V
CN001 pins 25 - 29, 31, 32, GND
35, 36, 49, 50
CN001 pins 45, 46 14 V DC ± 1 V
CN001 pins 47, 48 7 V DC ± 1 V
CN001 pins 25 - 29, 31, 32, GND
35, 36, 49, 50
( A ) ( B )
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