Hitachi 46W500 Training page 53

DP-3X AUDIO (Main-Terminal) CIRCUIT DIAGRAM EXPLANATION
(See Audio (Main-Terminal) Signal Path Diagram for details)
IV01 AUDIO VIDEO SELECTOR IC:
The main Audio path is delivered to the Audio/Video Selector IC IV01 to the following pins;
62 (Left) and 64 (Right): This is the Audio input from the Main Tuner U301. The integrated Tuner has an Internal Audio
decoding circuit that outputs Lt (Left Total) from pin 26 and Rt (Right Total) from pin 27. The Left continues through the
PST2 connector pin 48 and the Right continues to pin 47. They arrive at IV01 pins 62 and 64 respectively.
2 (DM-Left) and 4 (DM-Right): This is the Audio input from the ATSC Tuner UD2003. The Digital Tuner has an Internal
Audio decoding circuit that outputs Lt (Left Total) from pin 13 and Rt (Right Total) from pin 14. The Left continues
through the PST2 connector pin 28 and the Right continues to pin 29. They arrive at IV01 pins 2 and 4 respectively. The
Digital Module (ATSC Tuner) is only available on the DP-36 chassis.
59 (Left) and 61 (Right): This is the Audio input from Auxiliary 1 input. This audio is associated with component input 1
and with DVI 1 input.
29 (Left) and 31 (Right): This is the Audio input from Auxiliary 2 input. This audio is associated with component input 2
which also accepts composite video on the Y jack without a Cr plug and with DVI 2 input..
16 (Left) and 18 (Right): This is the Audio input from Auxiliary 3 input, composite or S-In only.
9 (Left) and 11 (Right): This is the Audio input from Auxiliary 4 input, composite or S-In only.
23 (Left) and 25 (Right): This is the Audio input from the front Auxiliary 5 input, composite or S-In only. These inputs
are delivered through the PFT connector pins 4 and 5 respectively.
SOME MODELS WITH DVD PLAYER:
If the set has a built in DVD Player, it will have IV08. This IC is responsible for selecting either the Front Audio from
input 5 or the DVD Player. Front Audio input L pin 12 and R Pin 2. DVD Audio L pin 13 and R pin 1. It outputs selected
audio L from pin 14 and R from pin 15 to IV01 L pin 23 and R pin 25.
MONITOR OUTPUTS:
38 (Left) and 40 (Right): This is the Monitor Audio Outputs.
LEFT and RIGHT OUTPUTS:
43 (Left) and 45 (Right): This is the Left Total and Right Total output which represent the Audio associated with the
Main picture. The Lt and Rt represent the fact that the Audio has any Dolby ® encoding still embedded.
The outputs are then routed through the PST2 connector pins 23 (Left) and 24 (Right) to the Center Select IC IA51 pins 2
and 12 respectively. IA51 is responsible for selecting the audio input from the Center Jack when the customer has set the
television to operate in TV as Center Mode. The Center audio is routed to pins 1 and 13. The control switching signal is
provided by the Microprocessor I001 pin 18 through the inverter QA58 to pin 10 and 11. A low on these pins with switch
to receive inputs from the main L and R and a high on these pins will place the IC into the Center mode.
The audio from IA51 leaves pin 15 Left and 14 Right and into the Audio Control IC IA01.
IA01 AUDIO CONTROL IC:
The NJW1160 is a sound processor includes the both BBE sound enhancement and SRS 3D Stereo.
It includes all of the functions processing audio signal for TV, such as tone control, balance, volume, mute, and AGC
functions. It also performs sound enhancement and surround. The sound enhancement regenerates high definitive and
nearly real sound, and SRS 3D Stereo regenerates 3D surround sound with two speakers.
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All of the internal status and variables are controlled by I C BUS interface.
The Audio is output from pin 8 (L) and 23 (R) to two different circuits. Primary route is to the Audio Output IC IAA1
pins 2 (L) and 4 (R) and out pin 12 (L) and 7 (R) to the speaker plug PSP L pin 5 and R pin 1.
The Secondary route from IA04 is to the Out to Hi-Fi jacks. L QA54 and QA55, R QA53 and QA52.
(See the Audio Video Mute circuit in the Microprocessor section for details on the Mute transistors operation and con-
trol).
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