Panasonic TH-42PA25U-P Service Manual page 47

Instrument name
1. RF signal generator
2. Oscilloscope
3. Measurement computer
1. Select STEREO mode in the AUDIO Menu.
2. Apply following RF signal at Antenna input.
VIDEO : Flat field , 30% modulation
AUDIO : 300Hz ,30% modulation ,STEREO (LEFT only)
(70dB ± 5dB ,75 OPEN ,P/S 10dB)
Note:
After setting 30% modulation with P.L. SW and N.R. SW off, turn P.L. SW
and N.R. SW on.
3. Adjust "SEPAL" data (Low-level separation) until the amplitude.
4. Apply following RF signal at Antenna input.
VIDEO : Flat field , 30% modulation
AUDIO : 3kHz ,30% modulation ,STEREO (LEFT only)
(70dB ± 5dB, 75 OPEN, P/S 10dB)
Note:
After setting 30% modulation with P.L. SW and N.R. SW off, turn P.L. SW
and N.R. SW on.
5. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform on the
oscilloscope is minimum.
6. Repeat steps 2. to 5. until Low-level separation and High-level separation satisfy above-mentioned
conditions.
11.2. Sub contrast Adjustment (NTSC)
Connection
RF ANT. INPUT
TP216-GND
SCL2, SDA2, FA2
Procedure
28
Remarks
Remarks
The separation mustbe more
20 dB at 300Hz and 3kHz.