Hitachi Alpha L42A404, Service Manual

Page: 23 / 72

L42A404
23
12. Audio Amplifier
R633
10K 1/10W 5%
A24V
GAIN0
GAIN1
C635
1uF
C657
0.1uF 50V
C643
0.22uF/50V
C653
0.22uF/50V
C645
NC
PD_MUTE
U602
TPA3121D2PWPR
PVCCL
1
SD
2
PVCCL
3
LIN
5
RIN
6
MUTE
4
BYPASS
7
AGND
8
AGND
9
PVCCR
10
VCLAMP
11
PVCCR
12
PGNDL
24
PGNDL
23
LOUT
22
BSL
21
AVCC
20
AVCC
19
GAIN0
18
BSR
16
GAIN1
17
ROUT
15
PGNDR
14
PGNDR
13
TH1
25
C641 0.22u 50V
L603
33uH +-25%
+
C638
1000uF 35V
C637
0.1uF 50V
R642
10K 1/10W 5%
C636
0.1uF 50V
L602
33uH +-25%
R649 0.5 OHM 2W
P24V
A24V
A24V
AUD_SHDN 8
C650
1uF C651 1uF
AMP_BYPASS
C644
NC
AMP_SD
R660
NC
R658
NC
R654
NC
R655
NC
AMP_RIN 11,13
AMP_LIN 11,13
R636
47K 1/10W 5%
R644
22K 1/10W 5%
A_MUTE
C640
NC/1uF/16V C642 1uF/16V
R661
2 KOHM
AMP_RIN
R656
2 KOHM
U601
G692L293TCUf 2.91V
GND
1
RESET
2
VCC
4
MR
3
AMP_LIN
PD_MUTE 13
C646 1uF/16V
R643
150R 1/10W 5%
C648
NC/1uF/16V
CN606
CONN
1
2
3
4
Q602
MMBT3904
C654
NC
C655
NC
P12V
C649 0.22u 50V
R672
0R05 1/10W 5%
20
L+
1
0
26
L606 NC/300 OHM
1
P12V
1
R-
R+
36
0
0
R
0
L
L-
+
C656
470UF 35V
GAIN(dB)
+
C652
1000uF 35V
GAIN1
1
+
C634
470UF 35V
GAIN0
16.2mm
O=1.8mm
3mm
6.2mm
25mm
HEAT SINK
Q90G6119
5
32
33G3802 4B Y W
AUD_SHDN
R659
0R05 1/10W 5%
R653
0R05 1/10W 5%
R646
3K9 1/10W 1%
AUD_SHDN
R648
2K2 1/10W 5%
R651
47K 1/10W 5%
Q604
MMBT3904
+5VSB
PHONE_MT 13
PHONE_MT
R671
0R05 1/10W 5%
R663
NC/0R05 1/10W 5%
R664
NC/0R05 1/10W 5%
GAIN0
GAIN1
A24V
Q603
MMBT3904
AUD_AMP_MUTE 8
R634
10K 1/10W 5%
VCC5D
PD_MUTE
ZD609
BAT54C
3
1
2
R632
47K 1/10W 5%
PHONE_MT