Hitachi L42A404 Service Manual page 23

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