Hitachi HTDK170EUK, Service Manual

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There are 1 DOUBLE SCART connector PL300 (Scart1 is for input on Scart
mode and Scart2 is for TV output), 3 pieces RCA audio jacks (L,R, Active
Subwoofer) for audio output, 3 pieces RCA A/V jacks for CVBS,L,R inputs on
AV mode, 1 RCA connector for CVBS out, 1 Connector for SVHS output.
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There are two op-amp ICs IC109 and IC110 for L,R and Active Subwoofer
output after DAC ICs (IC107 or IC108). IC109 generates L and R audio
outputs; IC110 generates Active Subwoofer output. JK302 is the output
connector for L,R and Active SW signals.
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JK306 is the CVBS, L and R input connector on the AV mode.
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Radio L,R, RCA Connector L,R, Scart connector input L,R, TV scart L,R
input (TV mode, for future use) are selected as analog audio source of the
system by IC402 MUX IC. This selected analog audio source comes to the
IC412 (LM833 op-amp IC) for amplification. By using ADC IC407 (CS5333) L
and R signals becomes digital audio signal and comes to ES60X8 for audio
proccessing operations.
14.4 DDX Board (Class-D Amplifier):
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Chipset : 2xDDX-4100 + 3x DDX-2060
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Architecture : Full-Bridge x 6
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Power Supply : + 20V unipolar supply @ 6A max., + 3.3V @ 0.1A typ.
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Audio Input Interface: Serial I2S
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Control Interface: I2C
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Power Interface: + 20V @ 6A Max., + 3.3V@ 0.1A Typ
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Output Interface: Speaker Level
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Speakers: 8 Ohm Sate 4 Ohm Subwoofer
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Output Power: 5 x 15 W + 25 W
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DDX Audio proccess ICs are U1 and U2 (DDX-4100A).
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U1 and U2 ICs on the DDX board have digital audio input with I
2
S bus.
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I
2
S signals are SDI_1, SDI_2, SDI_3 serial data lines U1,U2 pin1,pin2,
LRCK Left-Right clock signal U1,U2 pin3,
SCK serial clock signal U1, U2 pin4.
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For mute function U1 and U2 ICs uses EAPD (pin35, External Amplifier
Powerdown) signal. This signal comes to the power output ICs U3, U4 and
U5 (DDX-2060 ICs Pin25) as power down signal.