Panasonic TC-17LA1 Service Manual

Also see for TC17LA1 - 17" LCD COLOR TV: Operating instructions Operating instructions

Panasonic TC-17LA1 Service Manual Manual pdf 24 page image

8.6. MTS AdjustmentCaution:MTS adjustment shall be after the aging of 30 minutes or longer.8.6.1. RF Audio Input level AdjustmentInstrument name Connection Remarks1. Filter jig2. RF signal generator3. RMS voltage meterTPA180 - GND (TP181)RF ANT. INPUTFilter jigFilter jig1. Apply following RF signal at Antenna input.VIDEO : Flat field, 30 % modulationAUDIO : 300 Hz, 100 % modulation, monaural(70 dB ± 5 dB, 75 W, P/S 10 dB)Note:Make sure 75 us PRE-EMPHASIS is off.2. Adjust "MTSIN" data (Input level) until the RMS voltage meter indicates 106 mVrms ± 6 mVrms8.6.2. Stereo Separation AdjustmentInstrument name Connection Remarks1. RF signal generator2. Oscilloscope3. Headphone jigRF ANT. INPUTTPA150 - GND (TP181)Headphone jig1. Select STEREO mode in the AUDIO Menu.2. Set “Audio volume” DAC to “40”.3. Apply following RF signal at Antenna input.VIDEO : Flat field, 30% modulationAUDIO : 300Hz, 30% modulation, STEREO (LEFT only)(70dB ± 5dB, 75 W OPEN, P/S 10dB)Note:After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.4. Adjust "SEPAL" data (Low-level separation) until the amplitude.5. Apply following RF signal at Antenna input.VIDEO : Flat field, 30% modulationAUDIO : 3kHz, 30% modulation, STEREO (LEFT only)(70dB ± 5dB, 75W OPEN, P/S 10dB)Note:After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.6. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform on the oscilloscope is minimum.7. Repeat steps 3. to 6. until Low-level separation and High-level separation satisfy above-mentioned conditions.Note:The separation must be more than 20 dB at 300Hz and 3kHz.24TC-17LA1 / TC-20LA1