Panasonic PT-47WX33G, Service Manual

Page: 157 / 225

sure that color is not set so that it appears dull and washed out. Look for natural colors, try to adjust
the picture to appear as a normalphotograph.
17.22. 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 open, P/S 10dB).Make sure to turn off 75 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 TPA7 (R_out).
54