LTO L-12, Service Manual

Page: 16 / 77

1 2 3 4 5 6 7 8
A
B
C
D
8 7 6 5 4 3 2 1
D
C
B
A
EQ HI (12KHz)
VR1A
B50K
R44
6K8
VR4A
B50K
R43
6K8
LO(80Hz)
R63
47K
C1
47u/25V
5
6
7
U1B
4580M
R52
1M
C26
22P
R21
10K
VR2A
B50K
R35
22K
MID-LO(500Hz)
R5
1K8
C13
12n(M)
R6
1K8
C41
47n(M)
C33
3.3n(M)
C21
1n(M)
C17
12n(M)
C2
47u/25V
R71
5K1
3
2
1
U3A
4580M
VR5A
10KD
R96
12K
C45
22P
C4
47u/25V
LEVEL
BAL
R22
8K2
R23
8K2
R72
5K1
5
6
7
U3B
4580M
VR5B
10KD
R95
12K
C46
22P
C3
47u/25V
LEVEL
R25
10K
R24
10K
L12STEREO.Sch
Titel
Size
File:
Date:
Drawn By:
Sheet
Revision Model No:
12-Jul-2003
BOW.
L12STEREO(CH5-CH8)
8 2 of
ALTO L12
VER030710
A3
R73
12K
R74
12K
LEFT-BUS
RIGHT-BUS
2
1
3
SW7A
PS-22E85L
5
4
6
SW7B
PS-22E85L
5
4
6
SW4B
PS-42E85L
8
7
9
SW4C
PS-42E85L
AFL-L
AFL-R
R99
20K
R100
20K
R81
5K1
VR7
W50K
AUX2
VR8
W50K
R80
5K1
AUX1
2
1
3
SW2A
PS-22E85L
5
4
6
SW2B
PS-22E85L
11
10
12
SW4D
PS-42E85L
AUX1/2 PRE/POST
R26
8K2
SOLO(PFL)
2
1
3
SW4A
PS-42E85L
D1
BAS316
LOGIC
LD1
YEL
(SOLO)
R67
2K2
-VCC
(LOGIC=2.0V or 0.5V)
8
4
U2C
4580M
8
4
U3C
4580M
8
4
U1C
4580M
C53
100N
C54
100N
C55
100N
C56
100N
C57
100N
C58
100N
+VCC
-VCC
PRE-CH5
PRE-CH5
LOGIC
PCB# L12MN1.PCB
3
2
1
U1A
4580M
R39
220K
C25
22P
R1
220K
R8
1K8
VR3A
B50K
R7
1K8
HI-MID(3KHz)
R59
12K
C37
3.3n(M)
R51
1M
EQ HI (12KHz)
VR1B
B50K
R46
6K8
VR4B
B50K
R45
6K8
LO(80Hz)
R64
47K
C5
47u/25V
5
6
7
U2B
4580M
R54
1M
C29
22P
R27
10K
VR2B
B50K
R36
22K
MID-LO(500Hz)
R9
1K8
C14
12n(M)
R10
1K8
C42
47n(M)
C34
3.3n(M)
C22
1n(M)
C18
12n(M)
C6
47u/25V
PRE-CH6
PRE-CH6
3
2
1
U2A
4580M
R40
220K
C27
22P
R2
220K
R13
1K8
VR3B
B50K
R11
1K8
HI-MID(3KHz)
R60
12K
C38
3.3n(M)
R53
1M
EQ HI (12KHz)
VR12A
B50K
R50
6K8
VR15A
B50K
R47
6K8
LO(80Hz)
R65
47K
C8
47u/25V
5
6
7
U6B
4580M
R57
1M
C30
22P
R28
10K
VR13A
B50K
R37
22K
MID-LO(500Hz)
R15
1K8
C15
12n(M)
R17
1K8
C43
47n(M)
C35
3.3n(M)
C23
1n(M)
C19
12n(M)
C10
47u/25V
PRE-CH7
PRE-CH7
3
2
1
U6A
4580M
R41
220K
C28
22P
R3
220K
R14
1K8
VR14A
B50K
R12
1K8
HI-MID(3KHz)
R61
12K
C39
3.3n(M)
R55
1M
EQ HI (12KHz)
VR12B
B50K
R49
6K8
VR15B
B50K
R48
6K8
LO(80Hz)
R66
47K
C9
47u/25V
5
6
7
U7B
4580M
R58
1M
C32
22P
R29
10K
VR13B
B50K
R38
22K
MID-LO(500Hz)
R16
1K8
C16
12n(M)
R20
1K8
C44
47n(M)
C36
3.3n(M)
C24
1n(M)
C20
12n(M)
C11
47u/25V
PRE-CH8
PRE-CH8
3
2
1
U7A
4580M
R42
220K
C31
22P
R4
220K
R19
1K8
VR14B
B50K
R18
1K8
HI-MID(3KHz)
R62
12K
C40
3.3n(M)
R56
1M
R79
5K1
3
2
1
U8A
4580M
VR16A
10KD
R97
12K
C47
22P
C7
47u/25V
LEVEL
BAL
R30
8K2
R31
8K2
R85
5K1
5
6
7
U8B
4580M
VR16B
10KD
R98
12K
C48
22P
C12
47u/25V
LEVEL
R33
10K
R32
10K
R86
12K
R87
12K
LEFT-BUS
RIGHT-BUS
2
1
3
SW14A
PS-22E85L
5
4
6
SW14B
PS-22E85L
5
4
6
SW11B
PS-42E85L
8
7
9
SW11C
PS-42E85L
AFL-L
AFL-R
R101
20K
R102
20K
R94
5K1
VR18
W50K
AUX2
VR19
W50K
R88
5K1
AUX1
2
1
3
SW9A
PS-22E85L
5
4
6
SW9B
PS-22E85L
11
10
12
SW11D
PS-42E85L
AUX1/2 PRE/POST
R34
8K2
SOLO(PFL)
2
1
3
SW11A
PS-42E85L
D2
BAS316
LOGIC
LD2
YEL
(SOLO)
R68
2K2
-VCC
(LOGIC=2.0V or 0.5V)
LOGIC
CH5-8 (STEREO)
2
1
3
SW5A
PS-22E85L
5
4
6
SW5B
PS-22E85L
SUB1
SUB2
R75
12K
R76
12K
2
1
3
SW6A
PS-22E85L
SUB3
R77
12K
5
4
6
SW6B
PS-22E85L
SUB4
R78
12K
R83
5K1
VR9
W50K
AUX4
VR10
W50K
R82
5K1
AUX3
2
1
3
SW12A
PS-22E85L
5
4
6
SW12B
PS-22E85L
SUB1
SUB2
R84
12K
R91
12K
2
1
3
SW13A
PS-22E85L
SUB3
R92
12K
5
4
6
SW13B
PS-22E85L
SUB4
R93
12K
R90
5K1
VR20
W50K
AUX4
VR21
W50K
R89
5K1
AUX3
5
4
6
SW3B
PS-42E85L
8
7
9
SW3C
PS-42E85L
LD3
RED
R69
3K3
+VCC
PGND
MUTE
2
1
3
SW3A
PS-42E85L
2
1
3
SW10A
PS-42E85L
8
7
9
SW10C
PS-42E85L
LD4
RED
R70
3K3
+VCC
PGND
MUTE
5
4
6
SW10B
PS-42E85L
2
1
3
SW1A
SW PS-22E85L-2
L-CUT5-OF
L-CUT5-ON
INS-CH5-6
TRIM2-CH5
TRIM1-CH5
TRIM-CH5 LO-CUT-CH5
VR11
O10K
2
1
3
SW8A
SW PS-22E85L-2
L-CUT7-OF
L-CUT7-ON
INS-CH7-8
TRIM2-CH7
TRIM1-CH7
TRIM-CH7
LO-CUT-CH7
VR22
O10K
8
4
U6C
4580M
8
4
U7C
4580M
8
4
U8C
4580M
C61
100N
C62
100N
C63
100N
C64
100N
C65
100N
C66
100N
R665
15K
R666
15K
R667
15K
R668
15K
VR6
W50K
R719
4K7
R720
4K7
VR17
W50K
R722
4K7
R721
4K7
R683
4K7
+RVCC
R681
10K R677
10K
R680
10K
R675
100K
R676
100K
C454
1uF
R678
8K2
LD39
LED-2P
TR2
HR
R679
82R
1
2
3
4
8 U5A
393
5
6
7
U5B
393
R684
27K
R685
1K
3
2
1
U4A
4580M
綠 紅
D5
BAS316
D6
BAS316
C455
1uF
D7
BAS316
+RVCC
TR9
7002
R682
10K
C456
470P
R694
4K7
R691
10K R688
10K
R692
10K
R686
100K
R687
100K
C457
1uF
R689
8K2
LD40
LED-2P
TR8
HR
R690
82R
1
2
3
4
8 U9A
393
5
6
7
U9B
393
R695
27K
R696
1K
5
6
7
U4B
4580M
綠 紅
D8
BAS316
D17
BAS316
C458
1uF
D18
BAS316
+RVCC
TR3
7002
R693
10K
C459
470P
R747
8K2
R748
8K2
R749
8K2
R750
8K2
+RVCC
PGND PGND PGND PGND
PGND
PGND
PGND
PGND PGND PGND PGND
PGND
PGND
PGND
C500
47u/25V
C501
47u/25V
C502
47u/25V
C503
47u/25V