Panasonic PT-53X54J Service Manual page 59

Stereo separation adjustment (SEPAL & SEPAH)
Preparation:
1. Connect an RF signal generator to the RF antenna input.
2. Connect an oscilloscope probe to TP17 (R_OUT, A-board).
Procedure:
1. Set PTV to Stereo Mode (in the audio menu).
2. Apply the following signal from the RF signal generator: / Video:
100 IRE flat field, 30% modulation. / Audio: 300Hz, 30%
modulation, stereo (left only) (70dB ± 5dB, 75
Note:
Set the 30% modulation with the pilot light SW and N.R. switches OFF then turn them ON while
testing.
3. Adjust MTS low level separation "SEPAL" DAC data (in the
service menu) until the amplitude of the measured waveform on
the scope is minimum.
4. Apply the following signal from the RF signal generator: / Video:
100 IRE flat field, 30% modulation. / Audio: 3KHz, 30% modulation,
stereo (left only). / (70dB ± 5dB, 75
Note:
Set the 30% modulation with the P.L and N.R. switches OFF then turn them ON while testing.
5. Adjust MTS High Level Separation "SEPAH" DAC data until the
amplitude of the waveform measured on the scope is minimum.
6. Repeat above steps 2 through 5 until the amplitude is at minimum
for both signals.
17.16. Clock Adjustment (CLOCK)
OPEN, P/S10dB).
59
OPEN, P/S 10dB).