Section 9 -- Audio Circuitry; Audio Signal Path - Mitsubishi Electric VS-45605 Technical Training Manual

Overall Audio Signal Path
The Audio Signal Path in the VZ7 chassis is shown
in Figure 9-1. The same IC used to select the Video
source is used to select the Audio source, IC2K01.
TV Tuner Audio is demodulated and the Stereo/SAP
signals are decoded by IC3A01. External Audio In-
puts 1, 2 and 3, are on the rear of the set. The Exter-
nal 4 inputs are on the front of the TV. Audio Out-
puts are also located on rear of the set.
The selected sound source is output from pins 52,
and 54, of IC2K01 to IC3A01, the same IC used for
audio demodulation and Stereo/SAP decoding. User
sound adjustments such as Volume, Treble and Bass
are performed in the this IC, controlled by the Main
SDA line from the uPC Control Circuitry.
Section 9
Audio Circuitry
The outputs at pin 6, and pin 47 of IC3A01, are di-
rected over two paths:
The sound signals applied to the Audio Output Jacks
(Monitor Outputs), are output at pins 43 and 45 of
IC2K01. The user has the option of selecting fixed
or variable (adjustable) level signals for the Monitor
Outputs. If fixed level is selected, the signals from
pins 43 and 45 are the same as those output at pins
52 and 54. If variable level is selected, the signals
from pins 29 and 31, are output at pins 43 and 45.
Page 9-1
1) To the Power Amplifiers in IC301, and then
to the Speakers, and
2) back to IC2K01 at pins 29 and 31.