Hitachi 51F510, Manual

Page: 64 / 152

DP-4X AUDIO SIGNAL SELECTION PATH EXPLANATION
PAGE 04-02
(Continued from page 04-01)
Outputs from I401: Selected Audio Out from Pin 30 (L) and Pin 29 (R) :
The Audio Outputs from pin 30 and 29 of I401 are now split into two paths.
(1) Main Path: The Left and Right audio arrives at the Main BBE Control Chip IA01 at pins 1 and
30 .
(2) Secondary Path: If the Main Video Selection is something other than the Digital Module
(ATSC) the selected audio is routed back into the Digital Module. This way, there’s always a
Optical Digital Audio Output from the Digital Tuner if an external Decoder is used with Opti-
cal Inputs. The Selected Audio Outputs from pins
29 and 30 are tapped off and routed through
Q418
(Sel_DM L) and
Q419
(Sel_DM R). Then input to the Digital Module pin
47
(L) and
46
(R).
IA01 BBE Control Chip:
Here it is processed in accordance with the Customer’s Audio Menu selection and output on pins 8 and 23 .
The Audio splits into two paths at this point.
(1) Main Path: Is to the Audio Output IC IA02 . Left Audio is input to pin 2 . Right Audio is input
to pin 4 . Speaker Output from the Audio Output IC is Left pin 12 and Right pin 7 .
(2) Secondary Path: The Audio is routed back into the Audio Selector IC I401 to be selected as the
Out to Hi-Fi Audio.
Monitor Audio Output from I401:
•
Left Audio is output from pin 26 . And Right Audio is output from pin 25 to the Monitor Output Jacks.