74
PAL COLOR SYNC AND LISSAJOU ADJUSTMENTS
Measuring Instruments
Signal generator (PAL 75% color bar signal)
Oscilloscope
Test Points
CN001 pin 1 (Y Output)
CN001 pin 2 (B-Y Output)
CN001 pin 3 (R-Y Output)
Adjustment Points
S301 (APC SW), VR301 (LIS GAIN VR), VR304 (Pr GAIN VR), VR305 (PAL COLOR VR),
TC303(PAL PHASE TRIM), T301 (LIS 3 TRANSF)
[Preparation] Supply power to the following connector (CN001) pins using a DC power supply, extension cable, etc.
1. Apply the PAL color bar signal to Terminal VIDEO1.
2. Set S301 to S (Service).
3. Connect CH1 of the oscilloscope to CN001 pin 2 and CH2 to CN001 pin 3.
4. Adjust VR304 and VR305 to obtain a waveform as shown in (A) in the figure shown below.
5. Adjust VR301 and T301 so that the waveform changes from (A) to (B) in the following figure.
6. Connect CH1 of the oscilloscope to CN001 pin 1.
7. While obtaining synchronization with the H sync with CH1, adjust VR304 and VR305 so that the CH2 waveform becomes approximately as
shown in (C) in the figure shown below.
8. Adjust TC303 so that the CH2 waveform changes from (C) to (D) in the following figure. Waveform (D) should be almost stationary.
9. 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
( A )
( B )
( C )
( D )
Summary of Contents for BT-H1700P
Page 5: ......
Page 121: ...Printed in Japan FCD0111BAOK89P E414P E415P ...