- 31 -
Service Adjustments (Electronic Controls, cont.)
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
Ω
OPEN, P/S 10dB). Make sure that
the 75
µ
s pre-emphasis is OFF.
2.
Confirm MTS Output level on TPT4 on the RMS is
530 ± 20.0mV rms.
Stereo Separation Confirmation
Preparation:
1. Connect an RF signal generator to the RF
antenna input.
2.
Connect the scope to TPT3 for Right output.
3.
Connect the scope to TPT4 for Left output
Procedure:
1.
Select Stereo Mode in Audio menu
2.
Apply the following signal from the RF signal
generator:
Video: 100 IRE flat field, 30% modulation.
Audio: 300Hz, 30% modulation, stereo (left only)
(70 ±5dB, 75
Ω
OPEN, P/S 10dB).
3.
Confirm MTS stereo separation between Left and
Right is minimum 20db.
4.
Apply the following signal from the RF
signal generator:
Video: 100 IRE flat field, 30% modulation.
Audio: 3KHz, 30% modulation, stereo (left only)
(70 ±5dB, 75
Ω
OPEN, P/S 10dB).
5.
Confirm MTS stereo separation between Left and
Right is minimum 20db.
