Mts Input Level Adjustment; Mts Stereo Separation Adjustment - Panasonic TC-26LX70L Service Manual

12.3. MTS input level adjustment

Instrument Name
1. FILTER JIG
2. RMS VOLTAGE METER
3. RF SIGNAL GENERATOR
Procedure
1. Apply following RF signal at antenna input.
Video : Flat field , 30% modulation
Audio : 300Hz ,100% modulation ,monaural
(70dB±5dB ,75ohmOPEN ,P/S 10dB).
NOTE : Make sure 75us Pre-emphasis is off.
2. Choose MTSIN in MTS adjustment of factory mode.
3. Adjust "MTSIN" data (Input level) until the RMS voltage.
Meter indicates

12.4. MTS stereo separation adjustment

Instrument Name
1. OSCILLOSCOPE
2. RF SIGNAL GENERATOR
Procedure
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 ,75ohmOPEN ,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. Choose SEPAL in MTS adjustment of factory mode.
4. Adjust "SEPAL" data (Low-level separation) until the amplitude of the waveform on the oscilloscope is
MINIMUM.
5. Apply following RF signal at antenna Input.
Video : Flat field , 30% modulation
Audio : 3kHz ,30% modulation ,stereo (Left only)
(70dB±5dB ,75ohmOPEN ,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.
6. Choose SEPAH in MTS adjustment of factory mode.
7. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform on the oscilloscope is
MINIMUM.
8. Repeat step 2. to 7. Until Low-level separation and High-level separation satisfy above-mentioned
conditions.
Connect to
TP2200-GND or TP1105-GND or TP1107-
GND
FILTER JIG
RF ANT. INPUT
Connect to
TP1104-GND or TP1106-GNDor Monitor out R-
GND
RF ANT. INPUT
25
TC-26LX70L / TC-32LX70L
Remarks
Remarks
Remarks
Remarks
The separation must be more
than 20 dB at 300Hz and
3kHz..
More than 18dB when
measures at monitorOut.