Pre Amp & Sub-Woofer - EUROCOM M570U Service Manual

Schematic Diagrams
Pre Amp & Sub-Woofer
Sheet 25 of 40
Pre Amp &
Sub-Woofer
B - 26 Pre Amp & Sub-Woofer
R237 10K C371
[22] AC97_OUT_R
C372
[24] FRONT-R
R238 10K C374
[22] AC97_OUT_L
C373
[24] FRONT-L
VR3 6.8K R236 10K
R235
10K
R242 2.2K C740 0.1UF
R243 2.2K C739 0.1UF
R244
R240
10K
10K
1
VR4 6.8K R246 10K 2
3
62K 4
TR1
0.1UF
TR9 22K C747 5
6
TR5 4.7K C749 0.1UF 7
8
9
10
11
39K
TR2
0.1UF
TR8 18K C750 R247
TR6 3K C753 0.1UF
8.87K
TR3
30K C761
0.1UF
TR7 15K C755
R248
R249
TR4 2.2K C757 0.1UF
0.1UF
20K 15K
E C
WOWO_VDD
Q32
*DTA114EUA
HIGH BYPASS
LOW SRS
Q9
G
*2N7002
[27] SRS_CNTL#
WOWO_VDD
+5VCDROM
L22
HCB3216K-800T30
+5VCDROM [17,22,23,31]
AC97_VDD [22,24]
10UF/6.3V
10UF/6.3V
10UF/6.3V
10UF/6.3V
R519 R520
51K 51K
WOWO_VDD
C741 C370
0.1UF 10UF/6.3V
C369
U37 VR1
10UF/6.3V 5.1K
33
LFOUT GAININ
32
LFOCUS FOCUSBYPB
31
CB3 BASSBYPB
AP8202Q 30
CB3B GND
29 C378 4.7UF/10V
CB2 COMPI
28
CB2B ROUT
27
CB1 LOUT
26 C758
CB1B LWNI
25
FOUT LWPI
24 R538 R239 R539 R540
MIXOUT RWNI VR6
23
BP2 RWPI
15K
10K
30.1K
8.66K
AP8202Q
C769
C765 C771
R535 15K
0.082UF
C764
0.001UF
VR5
0.018UF
C767
0.1UF
C379
4.7UF/10V
SUB WOOFER
C693 1UF
C713 1UF
AC97_VDD
U34
R483 1K 21
[17,24] BTL# HP sense
R471 *0 MUTE 5
[24] SEL
Mute
4
Mode
R499 20K 13
Lef t Dock
PRE_LOUT C703 1UF R495 12
Lef t in
20K
11
Beep
PRE_ROUT C707 1UF R487 20K 10
Right in
9
Right Dock
R488 20K
AC97_VDD 6
Vdd
16
Vdd
C690 C677 C668 27
+ Vdd
C820
100UF/6.3V_B 1UF 0.1UF 0.1UF 1
GND
8
GND
14
GND
20
GND
23
GND
MUTE
R464
10K
C684
0.1UF 4.7U/0805
C712 1UF
C692 1UF
VR2 5.1K
R528 *0
R531 *0
R527 0 PRE_ROUT
PRE_ROUT [24]
R529 0 PRE_LOUT PRE_LOUT [24]
22PF
62K
62K
22PF
R470 20K
f=1/(2pR3C2)=1KHZ, s o
R482 20K C695 8200P/0603
C2=8200P
R486 20K
17 R497
-Lef t Out
0.1(0805) JSPK3
2
15 R496
+Lef t Out 1
0.1(0805)
CON2S
28 R466
+Right Out
*0.1(0805)
26 R485
-Right Out
*0.1(0805)
APA4835L
C683
R461
10K
R465 20K
R501 20K
C679 8200P/0603
R478 20K