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1.Audio circuit (Circuit diagrams Main PWB 1/1)
1.1 Audio input
The audio signal input received from the audio input terminal (P002) is applied to the
amplifier I004 of 4 (L-CH) and 9 (R-CH) through the low-pass filter consisting of
L006,L007,R008,R009,C013 and C014.
In this amplifier, controls of Volume is conducted.
1.2 Audio output
The audio signal is output from the output terminal (P007) of the jack to the speaker
system.
2.Power supply (Circuit diagrams MAIN PWB 1/1)
2.1 I322:DC-DC converter
A 5V power supply for LCD module, CPU, and logic is generated from the 12V- 19V
source.
2.2 I323:3-terminal regulator
A 3.3V power supply for Scaler IC I303,LVDS IC I309, I310 is generated from the
5V source.
2.3 I324:3-terminal regulator
A 2.5V power supply for Scaler IC I303 is generated from the 3.3V source.
Q303, I311 ON/OFF control for LCD Module
ON/OFF control is performed for power ON/OFF and also for the power saving
sequence.
3.Video input circuit (Circuit diagram Interface BD 2/5)
3.1 The analog video signal input entered from P301, the AC-coupled video signal is used
to clamp the black level at 0V.
3.2 The digital video signal input entered from P302.
4.Definition converter LSI peripheral circuit (Circuit diagram Interface BD 3/5)
I303 gm5120 is the definition converter LSI.
The analog R ,G,B signal input entered from the video input circuit is converted into the
digital data of video signal through the incorporated A/D converter. Based on this
conversion, this device performs interpolation during pixel extension. The source voltage for
this device is 3.3V,2.5V and the system clock frequency is 14.318MHz.
The withstand voltage level for the input signal voltage if I303 is 3.3V and 5V.
5.System reset, LED control circuit (Circuit diagram Interface BD 3/5)
5.1 System reset
System reset is performed by detecting the rising and falling of the 5V source voltage at
I306.
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