Alto Dragonfly PM-12 Service Manual page 19

1 2
D
MID (FREQ=100Hz-8K)
C2_6
VR2_6
47uF
B50K
PRECH6
PRECH6
R1_6
10K
C1_6
682(M)
R6_6
VR3_6A
3
3K
500KC
2
R21_6
C10_6
6K2
152(M)
VR3_6B
500KC
C
LD3_6
YEL
(SOLO)
1
2
PGND
LOGIC
3
SW6_6A D1_6
PS-42E85L BAS316
(LOGIC=2.0V or 0.5V)
C13_6 C15_6
100n 100n
+VCC
U1_6C U2_6C
4580M 4580M
-VCC
B
C14_6 C16_6
100n 100n
+RVCC
U4_6C
C17_6
LM393
100n
PGND PGND
A
1 2
3
EQ HI (12K)
C7_6 VR1_6 C8_6
C6_6
6.8n(M) 6.8n(M)
B50K
22P
C5_6 22P
R7_6
1M
R5_6
R2_6
10K 3K9
6
7 2
5
3
R11_6
U1_6B
R3_6
5K1
4580M
10K
1
U2_6A
4580M C12_6
C11_6
33n(M)
33n(M)
R22_6 VR4_6
R24_6
R25_6
6K2 5K6 B50K 5K6
LO (80Hz)
-RVCC
R23_6
2K2
LOGIC
+RVCC
R34_6
R33_6
10K
10K
5
R29_6
4148
PGND 6
100K
D2_6
+RVCC
U3_5B
6 PGND R38_6
7
4580M R32_6
10K
5
82R
3
D3_6
4148
2
R31_6
C20_6 R30_6
100K
U4_6A
1uF 8K2
393
PGND PGND PGND
3
4 5
R8_6 C9_6
5K1
22P
PS-22E85L-2
SW2_6B
4
5
6 6
VR10_6A
C3_6 10KD
5
47uF
LEVEL
U2_6B
1 R40_6
5K1 4580M
U1_6A
4580M
+RVCC
R26_6 PS-22E85L-2
3K3
SW2_6A
1
2
PGND
3
LD2_6 MUTE
RED
R4_6
10K
5
SW1_6B
TR1_6
U4_6B
PS-22E85L
R39_6
HR
393
27K
7
D4_6
AUX1/2 PRE/POST
C22_6
4148
1uF
R35_6
PGND
10K
8
LD4_6
TR3_6
LED-2P
1
7002
R36_6
紅 綠
4
4K7
C21_6 R51_6
470P 1K
PGND
4 5
18
6 7
PM12MN1 (CH6)
PAN
R41_6
4K7
SW5_6A
R9_6
PS-22E85L
1
5K1
R20_6 2
10K 3
LEFT-BUS
SW5_6B
7
R10_6
PS-22E85L
4
5K1
W50K 5
C4_6
VR9_6
6
47uF RIGHT-BUS
SW3_6A
R12_6
PS-22E85L
1
5K1
2
4K7
3
R42_6
SW3_6B
R13_6
PS-22E85L
4
5K1
5
6
SW4_6A
R14_6
PS-22E85L
1
5K1
2
3
SW4_6B
R15_6
PS-22E85L
4
5K1
5
6
SW6_6C
R27_6
PS-42E85L
7
6K8
8
9
DIR-OUT6
SW6_6D
R28_6
SW6_6B
PS-42E85L
10
6K8
PS-42E85L
11
4 12
6
SOLO(PFL)
SW1_6A
AUX-POST
PS-22E85L
1
VR7_6
2
W50K
R16_6
3
5K1
4
AUX-POST
5
6
VR8_6
W50K
R17_6
5K1
R18_6
AUX-PRE
5K1
VR5_6
W50K
R19_6
AUX-PRE
5K1
VR6_6
W50K
Titel
MAIN INPUT STAGE
PCB# PM12MN1.PCB
Size Model No:
A3 ALTO PM12
19-Feb-2005
Date:
File: CH6.Sch
6 7
8
D
SUB1
SUB2
SUB3
C
SUB4
AFL-L
AFL-R
AUX3
AUX4
B
AUX1
AUX2
A
Revision
VER030319
Sheet 6 of 8
Drawn By: KEVIN LIN.
8