8.6.
MTS Adjustment
Caution:
MTS adjustment shall be after the aging of 30 minutes or longer.
8.6.1.
RF Audio Input level Adjustment
Instrument name
Connection
Remarks
1. Filter jig
2. RF signal generator
3. RMS voltage meter
TPA180 - GND (TP181)
RF ANT. INPUT
Filter jig
Filter jig
1. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30 % modulation
AUDIO : 300 Hz, 100 % modulation, monaural
(70 dB ± 5 dB, 75
9
, 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 mVrms
8.6.2.
Stereo Separation Adjustment
Instrument name
Connection
Remarks
1. RF signal generator
2. Oscilloscope
3. Headphone jig
RF ANT. INPUT
TPA150 - GND (TP181)
Headphone jig
1. 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% modulation
AUDIO : 300Hz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
9
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% modulation
AUDIO : 3kHz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75
9
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.
24
TC-17LA1 / TC-20LA1
Summary of Contents for TC17LA1 - 17" LCD COLOR TV
Page 30: ...TC 17LA1 TC 20LA1 30 ...
Page 33: ...TC 17 20LA1 Power Block Diagram TC 17 20LA1 Power Block Diagram TC 17LA1 TC 20LA1 33 ...
Page 35: ...TC 17 20LA1 Signal Block Diagram TC 17 20LA1 Signal Block Diagram TC 17LA1 TC 20LA1 35 ...
Page 46: ...TC 17LA1 TC 20LA1 46 ...
Page 47: ...11 Parts Location Mechanical Replacement Parts List 11 1 Parts Location 47 TC 17LA1 TC 20LA1 ...
Page 48: ...11 2 Packing Exploded View 48 TC 17LA1 TC 20LA1 ...
Page 50: ...12 Replacement Parts List 12 1 Replacement Parts List Notes 50 TC 17LA1 TC 20LA1 ...
