Alto Dragonfly PM-12 Service Manual page 14

1 2
D
MID (FREQ=100Hz-8K)
C2_1
VR2_1
47uF
B50K
PRECH1
PRECH1
R1_1
10K
C1_1
682(M)
R6_1
VR3_1A
3
3K
500KC
2
R21_1
C10_1
6K2
152(M)
VR3_1B
500KC
C
LD3_1
YEL
(SOLO)
1
2
PGND
LOGIC
3
SW6_1A D1_1
PS-42E85L BAS316
(LOGIC=2.0V or 0.5V)
C13_1 C15_1
100n 100n
+VCC
U1_1C U2_1C
4580M 4580M
-VCC
B
C14_1 C16_1
100n 100n
+RVCC
U4_1C
C17_1
LM393
100n
PGND PGND
A
1 2
3
EQ HI (12K)
C8_1
C7_1
VR1_1
C6_1
C5_1 6.8n(M) 6.8n(M)
B50K
22P
22P
R7_1
1M
R5_1
R2_1
10K 3K9
6
7 2
5
3
R11_1
U1_1B
R3_1
5K1
4580M
10K
1
U2_1A
4580M C12_1
C11_1
33n(M)
33n(M)
R22_1 VR4_1
R24_1 R25_1
6K2 5K6 B50K
5K6
LO (80Hz)
-RVCC
R23_1
2K2
LOGIC
+RVCC
R34_1
R33_1
10K
R29_1
10K
5
100K
4148
PGND 6
D2_1
+RVCC
U3_1A
2 PGND R38_1
1
4580M R32_1
10K
3
82R
3
D3_1
4148
2
R31_1
R30_1
C20_1
100K
8K2
1uF
PGND PGND PGND
3
4 5
R8_1 C9_1
LEVEL
5K1
22P
PS-22E85L-2
SW2_1B
4
5
VR10_1A
6 6
10KD
C3_1
5
47uF
U2_1B
1 R40_1
5K1 4580M
U1_1A
4580M
+RVCC
R26_1 PS-22E85L-2
3K3
SW2_1A
1
3
LD2_1 MUTE
RED
R4_1
10K
5
TR1_1
SW1_1B
U4_1B
HR
PS-22E85L
R39_1
393
27K
7
D4_1
AUX1/2 PRE/POST
C22_1 4148
1uF
R35_1
TR3_1
PGND
10K
7002
8
LD4_1
R36_1
LED-2P
1
4K7
紅 綠
4
U4_1A
R51_1
C21_1
393 1K
470P
PGND
4 5
13
6 7
PM12MN1 (CH1)
PAN
R41_1
4K7
SW5_1A
R9_1
PS-22E85L
1
5K1
R20_1 2
10K 3
LEFT-BUS
SW5_1B
7
R10_1
PS-22E85L
4
5K1
W50K 5
C4_1
VR9_1
6
47uF RIGHT-BUS
SW3_1A
R12_1
PS-22E85L
1
5K1
2
4K7
3
R42_1
SW3_1B
R13_1
PS-22E85L
4
5K1
5
6
SW4_1A
R14_1
PS-22E85L
1
5K1
2
3
SW4_1B
2
R15_1
PGND
PS-22E85L
4
5K1
5
6
SW6_1C
R27_1
PS-42E85L
7
6K8
8
9
DIR-OUT1
SW6_1D
R28_1
SW6_1B
PS-42E85L
10
6K8
PS-42E85L
11
4 12
6
SOLO(PFL)
SW1_1A
AUX-POST
PS-22E85L
1
VR7_1
2
W50K
R16_1
3
5K1
4
AUX-POST
5
6
VR8_1
W50K
R17_1
5K1
R18_1
AUX-PRE
5K1
VR5_1
W50K
R19_1
AUX-PRE
5K1
VR6_1
W50K
Titel
MAIN INPUT STAGE
PCB# PM12MN1.PCB
Size Model No:
A3 ALTO PM12
19-Feb-2005
Date:
File: CH1.Sch
6 7
8
D
SUB1
SUB2
SUB3
C
SUB4
AFL-L
AFL-R
AUX3
AUX4
B
AUX1
AUX2
A
Revision
VER030319
Sheet 1 of 8
Drawn By: KEVIN LIN.
8