Block diagram
Lch
ECM
Rch
ECM
R03/AAA
Battery
DC1.5V
VR1
LPF BPF
NC
Adjustment
VR2
LPF BPF
NC
Adjustment
Power
SW
LED lighting
circuit
INPUT
Lch
Rch
GND
Phase
reversal
circuit
Phase
reversal
circuit
POWER IC
LA4537M
POWER IC
LA4537M
INPUT
VOLUME
Lch-SP
Rch-SP
(No.XC029) 2-1
Standard schematic diagram
R17
330
C3
22u 6.3V
Lch
R1
2.2k
C1
+
Lch
ECM
2.2u
D3
UDZS10B
R3
33k
R5
33k
C5
0.022u
C7
0.0056u
R7
110k
Q1
2SC4081
C9
2.2u
R9
470
R11
390k
Q3
2SC4081
R13
1.5k
R15
75
2.2u
C11
VR1
10kB
R19
8.2k
LEFT Ch
NC ADJ
C13
0.1u
R21
12k
C15
0.22u
C17
0.47u
R23
270k
Q5
2SC4081
R27
680
R25
680
220u 4V
C23
2.2u
C21
2.2u
C19
R29
150
+
+
C31
10u 4V
IC1
LA4537M
1
P/SW
2
IN1
3
PRE G
4
IN2
REF5VCC
MUTE SW
OUT1
PWR G
OUT2
C25
100u 4V
R31
15k
10
9
8
7
6
+
C33
0.1u
220u 4V
C35
0.1u
C27
+
R33
2.2
R35
R37
33
4.7
Lch SPEAKER
+
C29
220u 4V
R39
2.2
C4
22u 6.3V
Rch
R18
330
R2
2.2k
C2
+
Rch
ECM
2.2u
D4
UDZS10B
R4
39k
R6
39k
C6
0.022u
C8
0.0056u
R8
110k
Q2
2SC4081
C10
2.2u
R10
470
R12
390k
Q4
2SC4081
R14
1.5k
R16
75
C12
2.2u
VR2
10kB
POWER SW
BATT
R03
1.5V
S1
R41
22k
R43
270
C38
0.0015u
Q7
2SC4081
C39
0.0015u
R42
22k
Q8
2SC4081
R44
270
C40
0.22u
D1
2R4HD-3
D2
MA2J111
+
C37
470u 4V
Use of Circuit Diagram
Notes:
1. The thick line ( ) is the B (+) power supply.
2. This circuit diagram is the r
improvement.
3. Values printed in red show the voltar
with the power switch ON.
4. Parts marked with (in the shaded ar
!
designated parts to ensure safety.
eference diagram. Cir cuits and constans ar e subject to change without notice for
es of each section measured by the tester (internal resistance 20 kOhms/V),
R30
R20
8.2k
RIGHT Ch
NC ADJ
Lch
INPUT
GND
Rch
INPUT
C14
0.1u
R22
12k
C16
0.22u
C18
0.47u
R24
270k
Q6
2SC4081
R28
680
R26
680
C24
2.2u
220u 4V
2.2u
C22
C20
+
150
+
C32
C41
0.0047
10u 4V
C42
0.0047
IC2
LA4537M
1
P/SW
MUTE SW
2
IN1
OUT1
3
PRE G
PWR G
4
IN2
OUT2
REF5VCC
INPUT VOLUME
Rch SPEAKER
220u 4V
C36
0.1u
C28
R34
2.2
R36
+
4.7
R38
33
+
10
9
8
7
6
C34
0.1u
500
VR3
ea ) are safety parts.When replacing these, be sure to use only the
C30
220u 4V
R40
2.2
Descriprion of major IC
LA4537M (IC1,IC2) : Power Amplifier
POWER
IN 1
IN 2
REF
1
SWITCH
2
3
4
5
BIAS
POWER SWITCH
PRE GND
2-2 (No.XC029)
Amp 1
Amp 2
MUTE
CIRCUIT
10
MUTE SWITCH
9
OUT 1
8
POWER GND
7
OUT 2
6
Vcc
Wiring diagram
to Stereo miniplug
Brown
Red
C29
C30
C41
W
VR3
C37
White
Blue
L
L+
C25
C42
Red
B
RM
G
D4
D3
R-
L-
R+
D1
R
Red
to Drive unit Right and Left
Green
Red
Brown
Green
VR1
C28
C27
C19
C3
C32
S1
C31
VR2
C20
J34415-001A
PbF
C4
(No.XC029) 2-3
Printed circuit boards
Reverse side
C
B
C1
A
R6
R4
C2
R5
R3
R2
R1
C7
C8
R10
C6
C5
R7
Q2
R8
R18
Q1
R17
C10
R9
12345
P.C. Board Location
Symbol No.
IC1
IC2
D2
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
R1
R2
R3
R4
R5
R6
Location
ICs
Diode
Transistors
Resisters
Symbol No.
3A
3A
4B
1A
1B
2A
2B
2A
2B
3B
4B
1A
1B
1A
1B
1B
1B
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R16
R12
Q3
C9
R11
C16
Q4
C12
R14
R15
R13
Location
C11
R21
1A
1B
1A
1C
2A
2B
2A
2B
2B
1B
1A
1B
2A
2B
2A
2B
2A
2A
2A
3B
2A
C13
C17
C14
Q6
C15
R19
R25
R23
Symbol No.
R20
R22
C18
R27
R28
R29
R30
R31
R33
R34
R35
R36
R37
R38
R39
R40
R41
R42
R43
R44
C1
C2
C5
C6
R28
R26
R24-
R30
Q5
C21
R29
Location
Capacitors
R41
C22
C23
2B
2A
3A
3A
3A
4B
4A
4B
4A
4A
5A
5A
3B
3B
3B
4B
1B
1B
1A
1B
C24
1
R43
1
IC2
IC1
Symbol No.
6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C21
C22
C23
C24
C33
C34
C35
C36
C38
C39
C35
C33
Q7
R42
6
R31
R33
R37
Location
1B
1C
1A
1B
2B
2B
2A
2B
2A
2B
2A
2A
2A
3B
3A
3A
3A
4A
3A
4B
4B
C38
C36
C34
Q8
C40
R44
R34
R38
R35
Symbol No.
C39
C40
D2
R36
R39
Location
3B
4B
R40
2-4 (No.XC029)
Forward side
C
B
A
C3
C4
C19
C20
J34415-001A
C27
VR2
C31
S1
C28
C32
C30
C37
VR1
C25
D1
C29
VR3
L-
R+
R-
C41
W
L+
D3
D4
L G
C42
B
RM
PbF
R
12345
P.C. Board Location
Symbol No.
D1
D3
D4
VR1
VR2
VR3
Location
Diode
Resisters
4B
5B
5B
3B
2B
5C
Symbol No.
C3
C4
C19
C20
C25
C27
C28
Location
Capacitors
1B
1A
2C
1B
4B
2C
3C
Symbol No.
C29
C30
C31
C32
C37
C41
C42
Location
4C
3C
2B
3B
3B
5B
5B
Symbol No.
Other
S1 3B
Location
(No.XC029) 2-5
Loading...