Panasonic TC17LA2 - 17" LCD COLOR TV, Руководство по обслуживанию

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8.7.2. Stereo Separation Adjustment
Instrument name Connection Remarks
1. RF signal generator
2. Oscilloscope RF ANT. INPUT
VIDEO2 R
VIDEO2 R (RCA jack)-GND
1. Select STEREO mode in the AUDIO Menu.
2. Set “Audio volume” DAC to “40”.
3. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation
AUDIO : 300Hz sine wave, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
9
OPEN, P/S 10dB)
Note:
After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
4. Enter into SEPAL (MTS) adjustment mode.
5. Adjust "SEPAL" data (Low-level separation) until the amplitude becomes minimum.
6. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation
AUDIO : 3kHz sine wave, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
9
OPEN, P/S 10dB)
Note:
After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
7. Enter into SEPAH (MTS) adjustment mode.
8. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform is minimum.
9. Repeat steps 3. to 8. until Low-level separation and High-level separation satisfy above-mentioned conditions.
10. After adjustment, set “Audio“ volume “DAC” to “16“.
Note:
The separation must be more than 20 dB at 300Hz and 3kHz.
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TC-17LA2 / TC-17LA2D