Alto Dragonfly PM-12 Service Manual page 17

1 2
D
MID (FREQ=100Hz-8K)
C2_4
VR2_4
47uF
B50K
PRECH4
PRECH4
R1_4
10K
C1_4
682(M)
VR3_4A
R6_4
3
500KC
3K
2
R21_4
C10_4
6K2
152(M)
VR3_4B
500KC
C
LD3_4
YEL
(SOLO)
1
2
PGND
LOGIC
3
SW6_4A D1_4
PS-42E85L BAS316
(LOGIC=2.0V or 0.5V)
C13_4 C15_4
100n 100n
+VCC
U1_4C U2_4C
4580M 4580M
-VCC
B
C14_4 C16_4
100n 100n
+RVCC
U4_4C
C17_4
LM393
100n
PGND PGND
A
1 2
3
EQ HI (12K)
C8_4
C7_4
VR1_4
C6_4
6.8n(M) 6.8n(M)
B50K
22P
C5_4 22P
R7_4
1M
R5_4
R2_4
10K 3K9
6
7 2
5
3
R11_4
U1_4B
R3_4
5K1
4580M
10K
1
U2_4A
C12_4
4580M
C11_4
33n(M)
33n(M)
R22_4 VR4_4
R24_4
R25_4
6K2 5K6 B50K 5K6
LO (80Hz)
-RVCC
R23_4
2K2
LOGIC
+RVCC
R34_4
R33_4
10K
10K
5
R29_4
4148
PGND 6
100K
D2_4
+RVCC
U3_3B
6 PGND R38_4
7
4580M
10K
R32_4
5
82R
3
D3_4
4148
2
R31_4
C20_4 R30_4
100K
U4_4A
1uF 8K2
393
PGND PGND PGND
3
4 5
R8_4 C9_4
5K1
22P
PS-22E85L-2
SW2_4B
4
5
6 6
C3_4
5
47uF
LEVEL
U2_4B
1 R40_4
VR10_4A 5K1 4580M
10KD
U1_4A
4580M
+RVCC
R26_4
PS-22E85L-2
3K3
SW2_4A
1
2
PGND
3
MUTE
LD2_4
RED
R4_4
10K
5
SW1_4B
U4_4B
PS-22E85L
R39_4
TR1_4
393
27K
7
HR
D4_4
AUX1/2 PRE/POST
C22_4 4148
1uF
R35_4
PGND
10K
8
LD4_4
TR3_4
LED-2P
1
7002
R36_4
紅 綠
4
4K7
C21_4 R51_4
470P
1K
PGND
4 5
16
6 7
PM12MN1 (CH4)
PAN
R41_4
4K7
SW5_4A
R9_4
PS-22E85L
1
5K1
R20_4 2
10K 3
LEFT-BUS
SW5_4B
7
R10_4
PS-22E85L
4
5K1
W50K 5
C4_4
VR9_4
6
47uF RIGHT-BUS
SW3_4A
R12_4
PS-22E85L
1
5K1
2
4K7
3
R42_4
SW3_4B
R13_4
PS-22E85L
4
5K1
5
6
SW4_4A
R14_4
PS-22E85L
1
5K1
2
3
SW4_4B
R15_4
PS-22E85L
4
5K1
5
6
SW6_4C
R27_4
PS-42E85L
7
6K8
8
9
DIR-OUT4
SW6_4D
R28_4
SW6_4B
PS-42E85L
10
6K8
PS-42E85L
11
4 12
6
SOLO(PFL)
SW1_4A
AUX-POST
PS-22E85L
1
VR7_4
2
W50K
R16_4
3
5K1
4
AUX-POST
5
6
VR8_4
W50K
R17_4
5K1
R18_4
AUX-PRE
5K1
VR5_4
W50K
R19_4
AUX-PRE
5K1
VR6_4
W50K
Titel
MAIN INPUT STAGE
PCB# PM12MN1.PCB
Size Model No:
A3 ALTO PM12
19-Feb-2005
Date:
File: CH4.Sch
6 7
8
D
SUB1
SUB2
SUB3
C
SUB4
AFL-L
AFL-R
AUX3
AUX4
B
AUX1
AUX2
A
Revision
VER030319
Sheet 4 of 8
Drawn By: KEVIN LIN.
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