Alto Dragonfly PM-12 Service Manual page 20

1 2
D
MID (FREQ=100Hz-8K)
C2_7
VR2_7
47uF
B50K
PRECH7
PRECH7
R1_7
10K
C1_7
682(M)
R6_7
VR3_7A
3
3K
500KC
2
R21_7
C10_7
6K2
152(M)
VR3_7B
500KC
C
LD3_7
YEL
(SOLO)
1
2
PGND
LOGIC
3
SW6_7A
D1_7
PS-42E85L BAS316
(LOGIC=2.0V or 0.5V)
C13_7 C15_7
100n 100n
+VCC
U1_7C U2_7C
4580M 4580M
-VCC
B
C14_7 C16_7
100n 100n
+RVCC
U4_7C
C17_7
LM393
100n
PGND PGND
A
1 2
3
EQ HI (12K)
C7_7 VR1_7 C8_7
C6_7
6.8n(M) 6.8n(M)
B50K
22P
C5_7 22P
R7_7
1M
R5_7
R2_7
10K 3K9
6
7 2
5
3
R11_7
U1_7B
R3_7
5K1
4580M
10K
1
U2_7A
4580M C12_7
C11_7
33n(M)
33n(M)
R22_7 VR4_7
R24_7
R25_7
6K2 5K6 B50K 5K6
LO (80Hz)
-RVCC
R23_7
2K2
LOGIC
+RVCC
R34_7
R33_7
10K
10K
5
R29_7
4148
PGND 6
100K
D2_7
+RVCC
U3_7A
2 PGND R38_7
1
4580M
10K
R32_7
3
82R
3
D3_7
4148
2
R31_7
C20_7 R30_7
100K U4_7A
1uF 8K2
393
PGND PGND PGND
3
4 5
R8_7 C9_7
5K1
22P
PS-22E85L-2
SW2_7B
4
5
6 6
C3_7
5
47uF
U2_7B
1
LEVEL
R40_7
4580M
5K1
U1_7A
4580M VR10_7A
10KD
+RVCC
R26_7 PS-22E85L-2
3K3
SW2_7A
1
2
PGND
3
LD2_7 MUTE
RED
R4_7
10K
5
SW1_7B
U4_7B
R39_7
PS-22E85L
TR1_7
393
27K
7
HR
D4_7
4148
AUX1/2 PRE/POST
C22_7
1uF
R35_7
PGND
10K
8
LD4_7
TR3_7
LED-2P
1
7002
R36_7
紅 綠
4
4K7 R51_7
C21_7
1K
470P
PGND
4 5
19
6 7
PM12MN1 (CH7)
PAN
R41_7
4K7
SW5_7A
R9_7
PS-22E85L
1
5K1
R20_7 2
10K 3
LEFT-BUS
SW5_7B
7
R10_7
PS-22E85L
4
5K1
W50K 5
C4_7
VR9_7
6
47uF RIGHT-BUS
SW3_7A
R12_7
PS-22E85L
1
5K1
2
4K7
3
R42_7
SW3_7B
R13_7
PS-22E85L
4
5K1
5
6
SW4_7A
R14_7
PS-22E85L
1
5K1
2
3
SW4_7B
R15_7
PS-22E85L
4
5K1
5
6
SW6_7C
R27_7
PS-42E85L
7
6K8
8
9
DIR-OUT7
SW6_7D
R28_7
SW6_7B
PS-42E85L
10
6K8
PS-42E85L
11
4 12
6
SOLO(PFL)
SW1_7A
AUX-POST
PS-22E85L
1
VR7_7
2
W50K
R16_7
3
5K1
4
AUX-POST
5
6
VR8_7
W50K
R17_7
5K1
R18_7
AUX-PRE
5K1
VR5_7
W50K
R19_7
AUX-PRE
5K1
VR6_7
W50K
Titel
MAIN INPUT STAGE
PCB# PM12MN1.PCB
Size Model No:
A3 ALTO PM12
19-Feb-2005
Date:
File: CH7.Sch
6 7
8
D
SUB1
SUB2
SUB3
C
SUB4
AFL-L
AFL-R
AUX3
AUX4
B
AUX1
AUX2
A
Revision
VER030319
Sheet 7 of 8
Drawn By: KEVIN LIN.
8