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Description of A/V(MAIN and SUB PCB) and POWER
4-2-7. Audio signal processing, KEY, and LED
IC104 switches Audio signals and passes a switched signal to IC904 for audio signal processing.
IC904 controls sound parameters such as Volume, Balance, and Equalize. The outputs of IC904 are
passed to IC901(left), and IC903(right) respectively to amplify the signals. KEY and LED PCBs send
signals received from key buttons and LED to IC140 for command processing.
- Main IC
A. IC104
B. IC904
C. IC901, IC903
- Main TP (Input: Sound wave 400Hz)
TP_AUDIO: AUDIO SIGNAL that goes into MSP3420 before AUDIO PROCESSING
RIGHT (LEFT) : AMP input signal before 30dB amplification
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