- 12 -
SCHEMATIC DIAGRAM
UD-503
UD-503
1
2
3
4
5
6
7
8
A
B
C
D
E
Z
ANALOG PCB (5/5)
->0.325mA
<-0.325mA
Idle=15mA
Bias=1.5V
0.6mA
FcL=1.44Hz
0.6mA
hfe=180
hfe=180
<-0.325mA
->0.325mA
Idle=15mA
Bias=1.5V
0.6mA
0.6mA
hfe=180
hfe=180
Fc=320kHz
Fc=320kHz
FOR Q532,Q535
FOR Q534,Q537
HP_ON_R
GND
GND
GND
GND
P10V_R
N10V_R
P10V_R
N10V_R
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
P10V_R
N10V_R
NB10V_R
PB10V_R
NB10V_R
PB10V_R
NB10V_R
PB10V_R
NB10V_R
PB10V_R
NB10V_R
PB10V_R
NB10V_R
GND
GND
GND
GND
PB10V_R
3
A
N
R
3
A
P
R
HP_ON_R
1
RCA_P_R
1
RCA_N_R
1
XLR_ON_R
1
HP_BAL
1
DGND
1,4
1
R
2
P
H
Q542A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
R706
10k(F,2125)
+
-
U517B
NE5532AD
5
6
7
C662
1.0u
R702
47(F,2125)
+
C668
N.M
Q534
2SAR543D
+
C635
4.7u/50V(ROB)
R677
10(D,1/4W)
Q547A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
Q548B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
C661
N.M
R663
10(D,1/4W)
R658 1k(F,2125
)
Q547B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
Q542B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R678
10(D,1/4W)
Q536
2SCR543R
Q532
2SCR543D
+
-
V+
V-
U517A
NE5532AD
3
2
1
8
4
Q537
2SAR543D
Q539A
EMD2
6
2
1
R698
100(F,2125)
D526
RSB27V
1
2
R693
100k
Q535
2SCR543D
Q539B
EMD2
3
5
4
R659
10k(F,2125
)
R696
100(F,2125)
D535
1SS355VM
R672
1.5k(F,2125)
R666
33(F,2125)
R655
4.7k(F,2125)
R656
10k(F,2125)
R700
10k(F,2125)
R709
100k
R774
100k
R660
33(F,2125)
P504
XLRM_
2
1
3
R674 10k(F,2125)
R670
4.7k(F,2125)
R701
47(F,2125)
R676
33(F,2125)
C640
4700p/16V(ECHU)
R671
10k(F,2125)
R694
100k
R708
100k
C641
4700p/16V(ECHU)
R695
100(F,2125)
R675
33(F,2125)
Q544A
EMD2
6
2
1
Q546A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
Q541A
EMD2
6
2
1
R673 1k(F,2125)
Q540A
EMD2
6
2
1
C660
N.M
Q546B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
D525
RSB27V
1
2
R667
22k(F,2125)
Q544B
EMD2
3
5
4
P510
B8B-PH
1
2
3
4
5
6
7
8
C634
100p(1608,ECHU)
+
C631
220u/25V(KMG)
R707
100k
+
C632
220u/25V(KMG)
R653
1.2k(F,2125)
R703
47(F,2125)
D524
RSB27V
1
2
R669
560(F,2125)
C639
2700p/16V(ECHU
)
R699
47(F,2125)
C658
0.01u
C627
100p(1608,ECHU)
C676
0 OHM
R773
100k
+
C633
220u/25V(KMG)
Q550
DTC124EUB
R776
100k
Q541B
EMD2
3
5
4
Q533
2SCR543R
R704 10k(F,2125)
R775
100k
R654
560(F,2125)
R697
10k(F,2125)
Q551B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R691
100k
R731
2.2(1/4W)
Q543B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
Q551A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
C659
0.01u
+
C630
4.7u/50V(ROB)
Q548A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
C663
1.0u
R668
1.2k(F,2125)
Q543A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
+
C638
220u/25V(KMG)
R657
1.5k(F,2125)
R690
22k(F,2125)
J502
RJ-1081(R)
2b
1a 3
Q549A
EMD2
6
2
1
R692
100k
R730
2.2(1/4W)
Q540B
EMD2
3
5
4
R662
10(D,1/4W)
R705
10k(F,2125)
Q549B
EMD2
3
5
4
