Sony KV-32HS500 Training Manual page 61

(Reference Figure 8-1)
IC1502 is an Audio/Video Switch (located on the U-board), which selects both audio and video using the I
from Main Micro IC2300 (not shown). The following audio inputs are available to IC1502:
•
Audio 1 – 4
•
Audio 7
•
TU1 & 2
The selected audio is then sent to the M-board through CN1502/pins B25 & A25 (U-board) and CN2006/pins B25
& A25 (M-board), and applied to the audio processor IC2501. Audio inputs 5 & 6 from the U-board are applied
directly to the audio processor IC2501 (U-board) through CN1502/pins B5, A5, B3 and A3 (U-Board), and CN2006/
pins B5, A5, B3 and A3 (U-Board).
The Monitor L/R output also is output from the AV Switch IC1502, applied to Q1504 (buffer) and Q1503 (buffer),
and then to J1503.
The audio processor IC2501 takes the main audio input and produces a main L/R output and sub-woofer WL/
WR output (IC2501 also produces the Steady Sound feature). These outputs are then passed to the A-board
through CN2002/pins 2, 4, 6 and 7 (M-board) and CN523/pins 2, 4, 6 and 7 (A-board). Next they are applied to
the audio amplifies IC509/pins 2 & 4 (Midrange) and IC1508/pins 2 and 4 (Woofer). Note: IC508 is not used in
the DA-4X chassis (projection set). The low frequencies are enhanced in the protection set used the
DAC Speaker System. The DAC system uses the Midrange speakers TV cabinet as a low frequency
chamber system.
The VAR/FIX L/R audio is output from Audio Processor IC2501. Audio passes through buffer IC2502 and then
to CN2006/pins B1 and A1 (M-board), CN1502/pins B1 and A1, and is finally output at J1502.
Speaker outputs can be viewed at CN527/pins 3, 7, 1 and 5.
Mute transistor Q515, 516, 518 and 519 are activated when the MUTE or Channel buttons are pressed on the
remote controller (audio is mute between channels when changing channels). The A-MUTE line will go High,
and the transistor will turn ON and send the audio to ground muting the audio output.
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8. DA-4 & DA-4X Audio Circuits
2
C bus