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DP-4X AUDIO SIGNAL SELECTION PATH EXPLANATION
(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.
PAGE 04-02
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