Aug 20, 2003 ... PWA Preamp PCB Schematics. PAGE 1. SVT-CL. D. C. B. A. 4. 3. 2. NOTES:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED ...
A
B
C
C7
J2
D
R22
220K 1/4W 5per
15mV
-15dB INPUT
C9
P1 8
GAIN
9
I
C
O
1M A
SW1:B
22K 1/4W 5per
R3
R6 4.7K 1/4W 5per
100K 1/4W 5per C1
100K 1/2W 1per
TC
TI
TO
TC
TI
SW1:A
3
C10
R26
R28
1M 1/4W 5per
1.5K 1/4W 5per
R23 3.3M 1/4W 5per
220K 1/4W 5per
C3
TO
4
5
1
ULTRA HIGH
C20
CW
6
BASS
.001 100V
P2 1M A
.033 50V
R19 0.9V
220K 1/4W 5per
3
12
.0047 100V
235V
2
9
I
11
C8
100K 1/4W 5per
R7
10
4
470 pF 200V
R48 1
2
.1 100V
330K 1/4W 5per
R11
10 400V
0dB INPUT
R20
C
O
R1
C23
.1 400V
9-PIN
ULTRA LOW
J1
C11
1
V1:A CW
7
1
100K 1/2W 1per
240V
R21
C21 .01 100V
CW
R30
P4
R37
R29
R31
1.5K 1/4W 5per
100K 1/4W 5per
TREBLE
1M A
100K 1/4W 5per
22K 1/4W 5per
R32
C27
100K 1/4W 5per
.0047 100V
R43 100K 1/2W 1per
6
V2:B 9-PIN
3.3M 1/4W 5per
9-PIN
1.5K 1/4W 5per
2
1
1N914 75V PIV
2 3
220K 1/4W 5per
R24
D4 1N914 75V PIV
4
1.5K 1/4W 5per
R36
8.2K 1/4W 5per
C12
10 35V
470K 1/4W 5per
IC1:A
NE5532
R15
5
R5
R35
100K 1/4W 5per
100K 1/4W 5per
6
6 7
2
8
50K L
R16
MID
TAPPED 4
9
220K 1/2W 5per
CMN
3 100mH
10 11
2 300mH
C22
.033 100V
.1 100V
1
C15 .15 100V
4
2 CCW
470 1/4W 5per 7
100K 1/4W 5per
5
800mH
13
L1
14
C13 .68 250V
R2
1M 1/4W 5per
R9
1M 1/4W 5per
3
R10 R34 1M 1/4W 5per
4
R33
12
C19
+14V (OPERATE) -14V (STANDBY)
5
CW
C17
D3 1N914 75V PIV
J3
3
.68 250V
50K L
4.7K 1/4W 5per
.033 100V
100 1/2W 5per
1
1
C26
P5
MASTER 470 1/4W 5per
P3
2.2K 1/4W 5per
.047 100V
R38
2 3
100V
CW
R13
R44
470K 1/4W 5per
C24
.047 100V
2.2 50V
R18
220K 1/4W 5per
3
2
R40
C25
+14V (NORMAL) -0.6V (FAULT)
J4
.1 250V
R45
C14
D5
R14
0.4V
R8
22 35V
100K 1/4W 5per
9
8
C2
R12
5
C6
8
9
R4
9
.1 400V
6
56 pF 200V
5
4
C5
C4
.1 400V
7
2
C16 .1 100V
1
V2:A 9-PIN
8V
240V
7
V1:B
F
7V
R27 3.3M 1/4W 5per
470 pF 200V
E
R25
D2
560 1/2W 5per
1N914 75V PIV
CW
D1
BICOLOR RED
IC1:B NE5532
GREEN
R39
R41
R42
R46
470K 1/4W 5per
470K 1/4W 5per
470K 1/4W 5per
470K 1/4W 5per
S2 FREQUENCY
R17
R47
470K 1/4W 5per
470K 1/4W 5per
CMN
3
3 J5
ASSY P/N 07-519-12 1 2
D6 1N4002TR 100V PIV
D7 1N4002TR 100V PIV
J6
D8 1N4002TR 100V PIV
C18 1
07S519-12 DRAWING REPLACES 07S519-11
R50
D9 1N4002TR 100V PIV 4700 25V
220 1/4W 5per
R49 220 1/4W 5per
2
0
8-21-03
REV
CAUTION:
CONTROL ISSUE
Date
Signatures:
4
A
B
SVT-CL
Chgd By
Appvd by
Date
Date: RLB
Drawn: NOTES: 1) CAUTION: SHOCK HAZARD!! THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE TOUCHING INTERNAL PARTS. 2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL. CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL. 3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE AND 10 MEGOHM DIGITAL VOLTMETER.
Ecr(s)/Ecn(s)
DESCRIPTION
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO ST. LOUIS MUSIC, INC
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL. TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
5-8-03
4) 5)
Released:
VOLTAGES IN RECTANGLES ARE RMSSIGNAL, VOLTAGES WITH 15mV IN. OTHER VOLTAGES ARE D.C. IN CONDITIONS STATED. CIRCUIT GROUND
