©2007 LOUD Technologies Inc. All rights re served
Bass Amplifi er PCB Schematics
PAGE 2
B-200R
12/15/05
05/30/06
C
WFB
WFB
0
1
4
CAUTION:
A
B
C
D
Tolerance:
Plot Time:
Plot Date:
E
N02128
F
4
2
NOTES:
1
Checked:
Drawn:
Released:
REV
Date
Sheet
2
of
NONE
3
Date:
5-9-05
Appvd by
3
1
A
B
C
D
E
F
2
Wed May 31, 2006
Drawing Title:
1901 Congressional, St. Louis, MO 63146
ST. LOUIS MUSIC, INC
3
Signatures:
Drawing Number:
07S673
BASS AMP
First Used On:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Ecr(s)/Ecn(s)
Chgd By
Date
1) CAUTION: SHOCK HAZARD!!
Drawing Type: Schematic
Drawing Size:
CONTROL ISSUE
ADDED -02 ASSEMBLY
TOUCHING INTERNAL PARTS.
Class Code:
RLB
DESCRIPTION
3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL.
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL.
AND 10 MEGOHM DIGITAL VOLTMETER.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
12/15/05
05/30/06
C
WFB
WFB
0
1
4
CAUTION:
A
B
C
D
Tolerance:
Plot Time:
Plot Date:
E
N02128
F
4
2
NOTES:
1
Checked:
Drawn:
Released:
REV
Date
Sheet
2
of
NONE
3
Date:
5-9-05
Appvd by
3
1
A
B
C
D
E
F
2
Wed May 31, 2006
Drawing Title:
1901 Congressional, St. Louis, MO 63146
ST. LOUIS MUSIC, INC
3
Signatures:
Drawing Number:
07S673
BASS AMP
First Used On:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Ecr(s)/Ecn(s)
Chgd By
Date
1) CAUTION: SHOCK HAZARD!!
Drawing Type: Schematic
Drawing Size:
CONTROL ISSUE
ADDED -02 ASSEMBLY
TOUCHING INTERNAL PARTS.
Class Code:
RLB
DESCRIPTION
3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL.
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL.
AND 10 MEGOHM DIGITAL VOLTMETER.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
-50V
+50V
2
2
PA_INPUT_A
HPGS_A
PA_INPUT_A
+16VA
J3
TO J28
SEE SHT 3
PRE AMP
2
+50V
680
R45
2
-16VA
2
R38
1K
D17
1N914
75V PIV
C34
330 pF
100V
47
R64
R51
33K
C23
33 pF
200V
-16VA
*
CW
500
AP1
BIAS
330
R63
2.0VRMS
2
2
1
C29
MPS-A06
Q3
+16VA
1K
R55
D10
10V
1N4740
D8
10V
1N4740
.33
10W
R72
R70
47
R71
47
.33
10W
R73
L1
.5 uH
.33
10W
R75
J23
1
2
3
4
5
6
7
8
J29
R48
3.3K
1/2W
R46
10K
75V PIV
1N914
D14
C35
33 pF
200V
2
3
1
U3:A
NE5532
D11
75V PIV
1N914
C44
1
2
R59
1M
4.7K
R50
D9
75V PIV
1N914
R56
47
D20
75V PIV
1N914
.33
10W
R74
R65
1
1W
FOR 07-673-01 / -02 ASSEMBLIES
-16VA
-50V
HPGS_A
R60
47K
S
D
G J112
Q10
D13
1N914
75V PIV
SEE NOTE.
BIAS AJUST
800mVRMS
220
R41
270
R67
2
D26
1N914
75V PIV
R52
680
G
D
S
IRFP-140R
Q8
G
D
S
IRFP-140R
Q5
2
.1
C26
100V
G
D
S
IRFP-9140R
Q11
26.3VRMS
G
D
S
IRFP-9140R
Q4
R57
47
VTL-5C7
OC1
S
D
G
J112
Q9
C31
10
35V
MJE-350
Q6
6
5
7
U3:B
NE5532
220
R43
270
R58
1K
R42
MJE-340
Q7
C46
10
35V
R47
1/2W
3.3K
3.3
1W
R39
* D26 ON -02
VERSION ONLY
TEST POINT CONDITIONS NOTE :
1 KHz INPUT SINEWAVE 120mV @ 0 dB
INPUT JACK. 120VAC LINE, VOLUME, GAIN & HP LEVEL @ "10"
TONES @ "5" , DC VOLTAGES WITH N0 SIGNAL APPLIED.
NOTE: SET BIAS VOLTAGE FROM COLD START
ACROSS R72 - R75 , 15 -20 mV DC
AVERAGE , NO SIGNAL, NO LOAD.
