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http://tsn.pstc.panasonic.com/viewing/NA/PT-53X54J/SVC/s1715000000.html
17.15 MTS circuit adjustment
Note:
It is important to adjust the MTS circuit in the order shown below.
The MTS circuit adjustment require two steps:
1. Input level adjustment.
2. Stereo separation adjustment.
Input level adjustment (MTSIN)
Preparation:
1. Connect an RMS meter (A.C. range) with filter jig as shown:
Filter jig
2. Connect an RF signal generator to the RF antenna input.
Procedure:
1. Apply the following signal from the RF signal generator:
Video: 100 IRE flat field, 30% modulation.
Audio: 300Hz, 100% modulation, monaural (70 ± 5dB, 75
Ω
open, P/S 10dB).Make sure to turn off 75
μ
s pre-emphasis.
2. Adjust DAC MTSIN MTS-INPUT data until the voltage measured is 106 ± 6.0mV RMS.
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
Ω
OPEN, P/S 10dB).
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.
http://tsn.pstc.panasonic.com/viewing/NA/PT-53X54J/SVC/s1715000000.html (1 of 2) [23/04/2012 12:16:32 p.m.]
Содержание PT53X54J - 53" PROJECTION TV HD
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