LTO L-12, Service Manual, Page: 11 / 77

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CH1.Sch
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Revision Model No:
12-Jul-2003
BOW
5 2 of
ALTO L12
VER030712
A3
PCB# L12MN2.PCB
L12MN2-CH1(2/5)
R16
6K8
VR7
W50K
AUX1
R7
5K1
5
6
7
U2B
4580M
VR5A
10KD
R20
12K
C9
22P
VR9
W50K
C4
47u/25V
R14
6K8
AUX3
LEVEL
AUX-POST
R8
5K1
R9
5K1
LEFT-BUS
RIGHT-BUS
PAN
AUX-PRE
2
1
3
SW7A
PS-22E85L
5
4
6
SW7B
PS-22E85L
2
1
3
SW3A
PS-22E85L
5
4
6
SW3B
PS-22E85L
2
1
3
SW6A
PS-22E85L
5
4
6
SW6B
PS-22E85L
5
4
6
SW4B
PS-42E85L
2
1
3
SW4A
PS-42E85L
SUB1
SUB2
R10
5K1
R11
5K1
AUX1/2 PRE/POST
R5
10K
SOLO(PFL)
D1
BAS316
LOGIC
LD1
YEL
(SOLO)
R23
2K2
-VCC
(LOGIC=2.0V or 0.5V)
8
4
U1C
4580M
C17
100n
+VCC
-VCC
LOGIC
EQ HI (12K)
C7
6.8n(M)
VR1
B50K
R25
5K6
VR4
B50K
R24
5K6
LO (80Hz)
R4
10K
3
2
1
U2A
4580M
R19
1M
C6
22P
R18
3K9
VR2
B50K
MID (FREQ=100Hz-8K)
C11
33n(M)
C12
33n(M)
C8
6.8n(M)
C3
47u/25V
C2
47u/25V
INS2-CH1
INS2-CH1
3
2
1
U1A
4580M
5
6
7
U1B
4580M
R2
10K
R3
10K
C5 22P
C10
152(M)
R6
5K1
R1
3K
VR3B
500KC
VR3A
500KC
R22
6K2
C1
682(M)
R21
6K2
2
1
3
SW5A
PS-22E85L
5
4
6
SW5B
PS-22E85L
SUB3
SUB4
R12
5K1
R13
5K1
8
7
9
SW4C
PS-42E85L
11
10
12
SW4D
PS-42E85L
AFL-L
AFL-R
R27
6K8
R28
6K8
VR8
W50K
R15
6K8
AUX4
AUX-POST
R17
6K8
AUX2
VR10
W50K
AUX-PRE
5
4
6
SW1B
PS-22E85L-2
2
1
3
SW1A
PS-22E85L-2
LD2
RED
R26
3K3
+VCC
MUTE
2
1
3
SW2A
SW PS-22E85L-2
L-CUT1-OF
L-CUT1-ON
INS1-CH1
TRIM2-CH1
TRIM1-CH1
TRIM-CH1
LO-CUT-CH1
VR11
O10K
DIR-OUT1
8
4
U2C
4580M
C18
100n
C19
100n
C20
100n
R40
15K
VR6
W50K
R29
4K7
R30
4K7
R49
4K7
+RVCC
R47
10K
R46
10K
R45
10K
R41
100K
R42
100K
C21
1uF
R43
8K2
PGND PGND
PGND
PGND
LD3
LED-2P
TR1
HR
R44
82R
1
2
3
4
8
U4A
393
5
6
7
U4B
393
R50
27K
R51
1K
3
2
1
U3A
4580M
PGND
綠 紅
D2
4148
D3
4148
C22
1uF
PGND
D4
4148
PGND
+RVCC
TR2
7002
R48
10K
C23
470P
C28
47u/25V