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EN 92
9.
DPTV565 AA
resistor is across each yoke. These resistors will overheat if the
circuit is operated without the Convergence Yokes being
plugged in. The IC is powered by four supplies, +35 Volt, -35
Volt, VccPSW-V, and VCCNSW-V. The VccPSW-V supply is
normally at +22 volts. The BV_OUT, GV_OUT, and RV_OUT
lines are connected to a Vertical Power up circuit, which
senses the drive to the Convergence Yokes. If the drive to the
yokes reaches 10 to 12 Volts, the Vertical Power up circuit will
switch the VccPSW-V supply to +35 Volts. If the Vertical Power
up circuit senses a negative 10 to 12 volt drive to the Vertical
Convergence yokes, the VccNSW-V supply will switch from -
22 Volts to -35 Volts. As with the Horizontal drive circuit, 7005
mutes the output of 7045 during power up.
9.4
Audio
9.4.1
Overall Audio Block
Figure 9-34 Overall audio block
IC 7017, located on the SSM, selects Left and Right channels
of audio and feeds them to the Audio Processor, 7651, located
on the SSB panel. The Audio processor selects between the
9.4.3
Audio Amplifier
Circuit Descriptions, List of Abbreviations, and IC Data Sheets
9.4.2
E_15000_104.eps
181004
Figure 9-36 Audio Amplifier
two audio channels from the SSM or internally decoded audio
from selected audio IF on the SSB. The Processor outputs line
level Left and Right monitor audio, and line level Sub Woofer
out. These jacks are located on the SSM. It also outputs Left
and Right audio to the Audio Amplifier, located on the SSM.
Left and Right audio is output to a Headphone Amplifier located
on the SSM. The output of the Headphone Amplifier is fed to
the Side Jack Panel.
Audio Processor
Figure 9-35 Audio Processor
Audio processing is performed by 7651, which is located on the
SSB. QSS Audio IF is fed to pin 50 of the IC. If the RF signal
source is SECAM, the AM audio is fed to pin 47. Selected AV
audio is fed to Pins 42, 41,45, and 44. The Demodulator
detects and decodes the signal before feeding it to the
processing section. The selected AV audio is fed to two A/D
converters and then to the processing section. The Sound
processing includes Volume, Equalizer, balance, Loudness,
Incredible Sound, and Virtual Dolby. After processing, the
Audio signal is fed to six D/A converters. The Main Speaker
Audio is output on Pins 20 and 21. Headphone Audio is output
on Pins 17 and 18 before being fed to an amplifier on the SSM.
AV out Audio is output on Pins 25 and 26.
E_15000_105.eps
181004
E_15000_106.eps
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