Hitachi 46W500, Тренировка

Страница: 55 / 162

DP-3X MAIN / SUB AUDIO SELECT CIRCUIT DIAGRAM EXPLANATION
PAGE 04-03
(See Main/Sub Audio Select Circuit Diagram for details)
I301 responsibility is to route either the Main Tuner’s Audio or the Sub Tuner’s Audio to the Selector IC, IV01 .
This is possible while in the Split Screen mode for PinP. By pressing the Swap button in this mode, the audio is
switched between Main and PinP Audio.
The following describes the Left and Right audio path to
IV01
Selector IC, pin
47
Right and pin
48
Left
Main Tuner U301 (Left Total, Right Total):
From pin 27 Right and pin 26 Left.
Through
C099
Right,
C098
Left.
To I301 pin 1 Right, pin 13 Left.
Sub Tuner 302 (PinP Tuner):
From pin 27 mono audio.
To Q050 .
Through C086 .
To
I301
pin
2
Right, pin
12
Left.
I301 Main/Sub Selector IC.
The Audio inputs are selected by the control lines at pins 10 and 11 . These pins are controlled by the output from
the Microprocessor
I001
pin
72
through inverter
Q033
.
•
Pins 10 and 11 High = Main Tuner.
•
Pins 10 and 11 Low = Sub (PinP) Tuner.
I302
outputs the selected audio on the following pins,
15
for Right and
14
for Left. Through the
PST2
connector
pin 47 Right and 48 Left to the A/V Selector IC IV01 pin 64 Right and pin 62 Left.
(See Audio (Main/Terminal) Signal Path Circuit Diagram for details related to the continuation of the Audio sig-
nal flow)