Published:2011/7/24 10:07:00 Author:Robert | Keyword: Xinke, 5300A, Power Amplifier, Sound-Channel, Silent, Repairing | From:SeekIC
This device is a universal AV power amplifier certified by Dolby. The device's all kinds of functions and operation display is managed by a CPU (UPD78042). The selected audio signal would be send to NJW1103 for decoding after the buffer, and it would output L, R, C S four channel signals. The first two signals would be send separately to a single-chip integrated power amplifier TDA7294 for amplification after the Dolby/direct selection, balance, volume control, pre-amplification (LM833). However the central and the surround channel signals would be amplified and volume controlled directly by the LM833 and then are send to the end integrated power amplifier for amplification (C is TDA7294 and S is TDA7265). Also when starting the CPU's MUTE port will send the squelch signal and then do the squelch for each TDA7294 and TDA7265 through the squelch circuit.
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