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Description Of Block Diagram - IBM 19K1902 Service Manual

Speaker/usb hub
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1. USB(Universal Serial Bus) Circuit
This circuit consists of USB hub IC(TUSB2046B), and over voltage protector IC(TPS2042ADR).
This circuit is used to expand four ports of down stream for your easy using of low power device such as
keyboard, mouse and etc.
The integrated Bus-Power USB HUB meets the USB 2.0 specification for Full Speed Devices, allowing
up to 4 low power USB devices to be attached.
2. Audio Circuit
This circuit supports speaker output of 1W+1W(Right, Left).
Main amp(TDA7496L) amplifies input audio signal and has function of volume control, and Shutdown
Volume On/Off/Up/Down Control varies the volume of sound going to the speakers and headphone jack,
and uses to turn on/off audio.
When headphone is plugged into the headphone jack, the speakers are muted, and Microphone input/output
pass through connection to system microphone input.

DESCRIPTION OF BLOCK DIAGRAM

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19k1901T860