1. DCBA
4
3
2
NOTES:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
CAUTION:
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
TOUCHING INTERNAL PARTS.
1) CAUTION: SHOCK HAZARD!!
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.
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
DCBA
1
FE
1
Signatures:
Checked:
Drawn:
Sheet
Class Code:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Drawing Size:
Drawing Type: Schematic
Tolerance:
Released:
REV Date DESCRIPTION
E
0 7/01/99
1
-
OK
CONTROL ISSUE
SWAPPED J21 PINS 1 & 2, COONECTED J21
TO HEADPH GS TO DETACH FROM MAIN GND1
0
7/28/99
7/01/99
CONTROL ISSUE ECR00047
R990512-01
N00062
C
of
Drawing Title:
Drawing Number:NONE
2
Ecr(s)/Ecn(s)
First Used On:
ST. LOUIS MUSIC, INC
Date:
1/14/99
-
11880 Borman Drive, St. Louis, MO 63146
Chgd By Appvd by
-
F
BA115a
07S103-XX
2
SCHEMATIC -BASS AMP
Date
4
3
DCBA
4
3
2
NOTES:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
CAUTION:
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
TOUCHING INTERNAL PARTS.
1) CAUTION: SHOCK HAZARD!!
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.
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
DCBA
1
FE
1
Signatures:
Checked:
Drawn:
Sheet
Class Code:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Drawing Size:
Drawing Type: Schematic
Tolerance:
Released:
REV Date DESCRIPTION
E
0 7/01/99
1
-
OK
CONTROL ISSUE
SWAPPED J21 PINS 1 & 2, COONECTED J21
TO HEADPH GS TO DETACH FROM MAIN GND1
0
7/28/99
7/01/99
CONTROL ISSUE ECR00047
R990512-01
N00062
C
of
Drawing Title:
Drawing Number:NONE
2
Ecr(s)/Ecn(s)
First Used On:
ST. LOUIS MUSIC, INC
Date:
1/14/99
-
11880 Borman Drive, St. Louis, MO 63146
Chgd By Appvd by
-
F
BA115a
07S103-XX
2
SCHEMATIC -BASS AMP
Date
4
3
FC1
J6
J12 BLU/WHT
J13 BLK
J16 BLUE
J11 BROWN
J7 WHT
AC
LINE
AC
NEUTRAL
C1
.0033
J8
J13
J11
J12
J14
J15
J10
J18
F1
FC2
J17
2.2K
R51
4.7K
R40
.033 uF
C23
50V
22K
R46
C3
.0033
J16
J22
J19
AC
LINE
J9
J7
J20
J13 BLK
J14 WHT
J12 BLUE
J17 BLU/WHT
J15 BROWN
AC
NEUTRAL
J7 VIOLET
J11 GRAY
J9 VIOLET
J17 GRAY
T/S
J2
J1
T/S
100K
R65
22K
R62
C42
56 pF
200V
C37
.047 uF
100V
C34
50V
2.2 uF2.2K
R64
-16V
220K
R60
D10
1N914
D13
1N914
10K
R67
TLO-72
U5:B
C41
100 PF
200V
+16V
TLO-72
U5:A
.001uF
C32
100V
47K
R58
4.7K
R63 C36
50V
1 uF
22K
R57
C33
.047 uF
100V
C30
.0047 uF
100V
22K
R52
47K
R56
CW
P1
50K RA
22K
R48
50V
.22 uF
C26
C35
.047 uF
100V
47K
R45 C25
.22 uF
50V 22K
R36
47K
R53
47K
R47
C27
.22 uF
50V
22K
R54
47K
R55
RefDes
Power Table
84
+16V-16V
IC1
100K
R29
U4:A
TLO-72
84
84
84
84
1K
R32
50V
2.2 uF
C45
IC2
U3
U4
U5
5
3
CCW
CMN
CW
4
S1
SWITCH
PAGE_NEXT
J11 GRAY
J7 VIOLETAC
NEUTRAL
100V
C19
.1 uF
270 5W
R66100V
C38
.1 uF
J14 WHT
J15 BROWN
J12 BLUE
-40V
50V
4700 uF
C6
J17 BLK
J13 BLU/WHT
AC
LINE
50V
4700 uF
C14
C22
.033 uF
50V
BR1
3A
DIODE
BRIDGE
47K
R27
22K
R30
TLO-72
U4:B
C28
.22 uF
50V
100K
R39
C29
.015 uF
50V
.22 uF
C24
50V
+40V
270 5W
R68
22K
R38
22K
R37
R1
2.2K 1/2W
D1
RED
35V
100 uF
C39
35V
100 uF
C40
D11
16V
1N5353B
D12
16V
1N5353B
100V
C21
.047 uF
100V
C43
.047 uF
REM
REM
-16V
100V
C18
.047 uF
+16V

2. DCBA
4
3
2
NOTES:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
CAUTION:
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
TOUCHING INTERNAL PARTS.
1) CAUTION: SHOCK HAZARD!!
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.
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
DCBA
1
FE
1
Signatures:
Checked:
Drawn:
Sheet
Class Code:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Drawing Size:
Drawing Type: Schematic
Tolerance:
Released:
REV Date DESCRIPTION
E
0 7/01/99
2
-
OK
CONTROL ISSUE
SWAPPED J21 PINS 1 & 2, COONECTED J21
TO HEADPH GS TO DETACH FROM MAIN GND1
0
7/28/99
7/01/99
CONTROL ISSUE ECR00047
R990512-01
N00062
C
of
Drawing Title:
Drawing Number:NONE
2
Ecr(s)/Ecn(s)
First Used On:
ST. LOUIS MUSIC, INC
Date:
1/14/99
-
11880 Borman Drive, St. Louis, MO 63146
Chgd By Appvd by
-
F
BA115a
07S103-XX
2
SCHEMATIC -BASS AMP
Date
4
3
DCBA
4
3
2
NOTES:
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
CAUTION:
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
TOUCHING INTERNAL PARTS.
1) CAUTION: SHOCK HAZARD!!
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.
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
DCBA
1
FE
1
Signatures:
Checked:
Drawn:
Sheet
Class Code:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Drawing Size:
Drawing Type: Schematic
Tolerance:
Released:
REV Date DESCRIPTION
E
0 7/01/99
2
-
OK
CONTROL ISSUE
SWAPPED J21 PINS 1 & 2, COONECTED J21
TO HEADPH GS TO DETACH FROM MAIN GND1
0
7/28/99
7/01/99
CONTROL ISSUE ECR00047
R990512-01
N00062
C
of
Drawing Title:
Drawing Number:NONE
2
Ecr(s)/Ecn(s)
First Used On:
ST. LOUIS MUSIC, INC
Date:
1/14/99
-
11880 Borman Drive, St. Louis, MO 63146
Chgd By Appvd by
-
F
BA115a
07S103-XX
2
SCHEMATIC -BASS AMP
Date
4
3
1K
R18
22K
R21
C15
.022 uF
50V
NOTE: BIAS SETTING AS FOLLOWS;
SET AP1 BIAS ADJUST CONTROL
FOR 5mV ACROSS R61 WITH
NO SIGNAL APPLIED, NO LOAD.
NOTE: R11 & C7 DESIGNATORS ARE NOT USED.
R13
100K
100K
R12
L
R
J3
22 uF
C5
50V
22K
R16
22K
R15
C4
22 uF
50V
270
R3
270
R2
R10
22K
22K
R17
P4
50K LIN
P5
50K LIN
2
3
1
U1:A
TLO-72
6
5
7
TLO-72
U1:B
CW
CW
P3
50K LIN
U2:A
TLO-72
47K
R24
C16
.0022 uF
100V
C8
56 pF
200V
PAGE_NEXT
CCW
CW P2
20K RA
R20
100K
TLO-72
U2:B
3.3K 1/2W
R7
R14
100K
10uF
C9
35V
D3
1N914 1N914
D5
+40V -40V
VTL-5C7
R8
1K
D2
1N914
R23
47K
R25
10K
33 pF
C12
200V
NE5532
U3:A
C11
10uF
35V
S
D
G
Q6
J112
1N914
D4
R4
1K
R59
1M50V
1 uF
C44
R6
3.3K 1/2W
R22
1K
-16V
820 1W
R5
33K
R19
33 pF
C10
200V
C17
.1 uF
100V
R28
3.3 1W
+40V
47
R33
D7
1N4744
ZENER
Q4
MJE-340
+16V
R34
220
1K
R50
10uF
C31
35V
R41
220
D6
1N4744
ZENER
Q2
ASSY P/N 07-103-02
C2
.047 uF
100V
1
3
2
XLR M H
J5
R26
47
330 pF
C13
100V
U3:B
NE5532
R9
220
SLVE_SW
SLEEVE
TIP_SW
RING
RING_SW
TIP
J4
T/R/S
C20
1 uF
50V
D8
1N4744
ZENER
R49
47
SEE NOTE.
MPS-A06
Q3
R44
4.7K
1K
R43
R35
220
Q1
MJE-350
-16V
-40V
220
R31
1K
R42
500
AP1
CW
1
2
J21
.1 3W
R61
-40V
D9
1N4744
ZENER
Q5
IRFP-140R