- 11 -
SCHEMATIC DIAGRAM
UD-503
UD-503
1
2
3
4
5
6
7
8
A
B
C
D
E
Z
ANALOG PCB (4/5)
Idle=15mA
Bias=1.5V
0.6mA
0.6mA
->0.325mA
hfe=180
hfe=180
<-0.325mA
->0.325mA
<-0.325mA
Idle=15mA
Bias=1.5V
0.6mA
0.6mA
hfe=180
hfe=180
Fc=320kHz
Fc=320kHz
FOR Q515,Q518
FOR Q517,Q520
HP_ON_L
GND
GND
GND
GND
GND
GND
P10V_L
N10V_L
P10V_L
N10V_L
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
N10V_L
P10V_L
NB10V_L
PB10V_L
NB10V_L
PB10V_L
NB10V_L
PB10V_L
NB10V_L
GND
GND
GND
GND
PB10V_L
2
A
P
L
2
A
N
L
HP_ON_L
1
RCA_N_L
1
RCA_P_L
1
XLR_ON_L
1
DGND
1,5
1
L
1
P
H
Q526A
EMD2
6
2
1
C625
4700p/16V(ECHU)
R729
2.2(1/4W)
R611
4.7k(F,2125)
R648
10k(F,2125)
D520
RSB27V
1
2
R631
33(F,2125)
R609
1.2k(F,2125)
Q523A
EMD2
6
2
1
R643
100(F,2125)
Q526B
EMD2
3
5
4
Q531B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R619
10(D,1/4W)
R624
560(F,2125)
Q531A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
R638
100k
C667
N.M
Q522A
EMD2
6
2
1
C664
0.01u
R613
1.5k(F,2125)
Q529B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R652
10k(F,2125)
R616
33(F,2125)
R644
100k
Q522B
EMD2
3
5
4
Q527A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
D521
RSB27V
1
2
Q527B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R630
33(F,2125)
R778
100k
R626
10k(F,2125)
J501
RJ-1081(W)
2b
1a
3
R649
47(F,2125)
R628
1k(F,2125)
+
C623
220u/25V(KMG)
D536
1SS355VM
R614
1k(F,2125
)
P509
B6B-PH
1
2
3
4
5
6
Q528B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
+
C615
4.7u/50V(ROB)
+
-
V+
V-
U516A
NE5532AD
3
2
1
8
4
P503
XLRM_
2
1
3
Q516
2SCR543R
C626
4700p/16V(ECHU)
+
C618
220u/25V(KMG)
R641
100(F,2125)
Q528A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
R629
10k(F,2125)
R623
1.2k(F,2125)
R642
10k(F,2125)
R610
560(F,2125)
Q523B
EMD2
3
5
4
R645
10k(F,2125)
Q529A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
Q525B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
R636
22k(F,2125)
+
C616
220u/25V(KMG)
D522
RSB27V
1
2
C612
100p(1608,ECHU)
Q525A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
Q530A
TT8K11
SOURCE
1
GATE
2
DRAIN1
8
DRAIN2
7
R777
100k
R633
10(D,1/4W)
C675
0 OHM
R637
100k
R780
100k
R639
100k
+
C617
220u/25V(KMG)
R615
10k(F,2125)
R651
10k(F,2125)
C619
100p(1608,ECHU)
C624
2700p/16V(ECHU)
Q524A
EMD2
6
2
1
Q530B
TT8K11
SOURCE
3
GATE
4
DRAIN1
6
DRAIN2
5
C666
N.M
C665
0.01u
R612
10k(F,2125)
R632
10(D,1/4W)
+
-
U516B
NE5532AD
5
6
7
R640
100(F,2125)
Q524B
EMD2
3
5
4
+
C669
N.M
Q520
2SAR543D
R618
10(D,1/4W)
+
C620
4.7u/50V(ROB)
R646
47(F,2125)
R617
33(F,2125)
Q518
2SCR543D
Q515
2SCR543D
R622
22k(F,2125)
R627
1.5k(F,2125)
R650
47(F,2125)
R779
100k
Q517
2SAR543D
R647
47(F,2125)
R728
2.2(1/4W)
Q519
2SCR543R
R625
4.7k(F,2125)
