ViewSonic VX500PLUS-1 Service Manual page 38

22 RRout
23 LRout
24 RFout
25 LFout
26 Dgnd
27 Date
28 Clk
ICA1 control & regulate the voltage (12Vto9V) to the ICA2.
Volume signal through ICA2 pin24 (right) pin25 (left) into audio amplifier ICA3.
2. Audio amplifier:
ICA3 (TDA1517) is an integrated class-B dual output amplifier, it contains two identical
amplifier differential input stages. The gain of each amplifier is fixed at 20 dB.
Pins 1 and 9 are right and left channel inputs respectively. Pins 4 and 6 are right and left
channel outputs which connect to two 4 OHM speakers.
Pin 8 is the mute/stand-by.
Pin 7 is the voltage input for ICA1.
C. Touch Sensor Board
1. Touch Sensor IC:
ICT1 (EM03) is an 8-Channel Capacitive Sensor. It designed specifically for touch controls.
It's provide stable sensing under a wide variety of changing conditions. It will project a sense field
through almost any dielectric. It is designed specifically for human interfaces, like control panels,
application lighting controls or anywhere a mechanical switch or button may be found. The device
is designed to detect touch on up to 8 point independently.
ViewSonic Corporation
O Right rear speaker output
O Left rear speaker output
O Right front speaker output
O Left front speaker output
- Digital ground
I IIC Date
I IIC Clk
35
Confidential – Do Not Copy
VX500+-1