Service manual

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PIN# PIN NAME I/O DESCRIPTION
1 REF - Analog reference voltage(1/2 VDD)
2 VDD - Supply input voltage
3 Agnd - Analog ground
4 Treb_L I Left channel input for treble control
5 Treb_R I Right channel input for treble control
6 RIN I Audio processor right channel input
7 Rout O Gain output&input selector for right channel
8 Loud_R I Right channel loudness input
9 Rin 3 I Right channel input 3
10 Rin 2 I Right channel input 2
11 Rin 1 I Right channel input 1
12 Loud_L I Left channel loudness input
13 Lin 3 I Light channel input 3
14 Lin 2 I Light channel input 2
15 Lin 1 I Light channel input 1
16 LIN I Audio processor left channel input
17 Lout O Gain output&input selector for left channel
18 Bin _L I Left bass controller input channel
19 Bout _L O Left bass controller output channel
20 Bin _R I Right bass controller input channel
21 Bout _R O Right bass controller output channel
22 RRout O Right rear speaker output
23 LRout O Left rear speaker output
24 RFout O Right front speaker output
25 LFout O Left front speaker output
26 Dgnd - Digital ground
27 Date I IIC Date
28 Clk I IIC 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.
ViewSonic Corporation
Confidential – Do Not Copy
VG800b
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