1
2
3
4
5
6
7
8
9
10
11
12
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
1
2
3
4
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YDP-323
YDP-323
YDP-323
<Page. 3>
28CC1-8812254
28CC1-8834937
1
28CC1-8835032
1
1
N
I
-
C
A
T
E
L
N
I
-
C
A
28CC1-8812287
Power indicator
U
MASTER
VOLUME
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
POWER
PHONES
Keybed
28CC1-8811547
R5
C6
20uH
20uH
20uH
20uH
10uH
10uH
C7
J
SPEAKERS
L
R
A-1 ~ C0
G2 ~ C3
C#3 ~ F#3
G3 ~ C4
C#4 ~ F#4
G4 ~ C5
C#5 ~ F#5
G5 ~ C6
C#6 ~ F#6
G6 ~ C7
G0 ~ C1
G1 ~ C2
C#0 ~ F#0
C#1 ~ F#1
C#2 ~ F#2
AC-IN
V-SEL
C1, C2
C3
J1
J2
F1
F2
F3
U
POLARIZED
Not installed
0.0047 / 250V
0.01 / 250V
Not installed
Installed
2A
Not installed
5A
DESTINATION
1 MODEL SPECIFICATION
TRANS SPECIFICATION
R78/R81/C77/C78: not installed
CN7: not installed
CN8: not installed
not installed
POWER
TRANSFORMER
REGULATOR
+12V
REGULATOR
+5V
OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
POWER AMP
20W + 20W
POWER AMP
OP AMP
OP AMP
WARNING
Components having special characteristics are
marked
Z
and must be replaced with parts having
specification equal to those originally installed.
Note : See parts list for details of circuit board
component parts.
REG12V
MAEQ: IC1
µ
PC24M12AHF-AZ (XU387A00)
1
2
3
3: OUTPUT
2: GND
1: INPUT
REG5V
MAEQ: IC2
µ
PC2405AHF (XR607A00)
1
2
3
3: OUTPUT
2: COMMON
1: INPUT
1T4-T/A52 TP (V7803100)
1T4-T/A26 TP (V9362200)
DIODE
PS: D1, 2
1
2
1: ANODE
2: CATHODE
1SS355 TE-17 (VT332900)
DIODE
MAEQ: D1, 2, 4–6
1: ANODE
2: CATHODE
1
2
D3SBA20 (VN011300)
DIODE STACK 4.0A 200V
PS: DB1
2SC2412K(VV556400)
TRANSISTOR
MAEQ: TR1–3
1
1
2
2
3
3
1: EMITTER
2: BASE
3: COLLECTOR
: Not installed
: Ceramic Capacitor
: Mylar Capacitor
WHITE
BLACK
RED
BROWN
1SS133, 1SS176 (VB941200)
DIODE
GHD EBUS L: D1–69
GHD H: D61–108
GHD M: D1–60
1
2
1: ANODE
2: CATHODE
Not installed
Not installed
28CC1-8819027
2
28CC1-8819224
28CC1-8822378
28CC1-8822377
(A-1
~
F#2)
(G2
~
C5)
(C#5
~
C7)
■
YDP-323 OVERALL CIRCUIT DIAGRAM 2/2 (GHD EBUS L, GHD H, GHD M, HP, MAEQ, MK SUB, MVR, PL, PS)