Daewoo DQD-2100D, Service Manual

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3. OP-AMP IC (IC303, IC304, IC305) : NJM4580M
1) Overview
Dual operational amplifier
2) Functions
It amplifies Analog audio signal from D/A Converter IC.
Each associates to and amplifies 2 channels, and then outputs 5.1 Channel to JK300.
cf) 2CH Audio DAC IC (IC300) model outputs 2 Channels to JK301 using only OP-AMP IC (IC 303).
3) Internal Block Diagram
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CIRCUIT OPERATIONAL DESCRIPTION
4. Hex Inverting Gates IC : (IC306)
1) Overview
It consists of 6 independent gates constructing Logic INVERT function
2) Functions
After Noise Filtering Digital audio signal from MPEG DECODER(IC405), it outputs the Digital audio
signal to Coaxial(JK302).
3) Internal Block Diagram