JBL PowerBass PB10, Service Manual

Page: 48 / 54

48
1 2 3 4
A
B
C
D
4 3 2 1
D
C
B
A
Title
Number Revision Size
Tabloid
Date: 20-Apr-2000 Sheet of
File: T:\PB10 sch Folder\..\PB10 preamp Rev5.sch Drawn By:
1
2
3
4
5
6
Un-designated Connector
NOT USED
U1
U2 U1
LM324
U1
LM324
R16
1k3
C9
330nF
C8
330nF
C7
330nF
R15
11k3
R17
243k
R14
68k1
R35
137k
R13
33k2
R9
2k7
C5
220pF
C3 220pF
C2
200uF
C1
200uF
8
10
9
R27
604r
R34
60k4
R24
604r
R28 33k2
C19 330pF
C18 330pF
R10
10k
R11
57k6 C6
220p
R In
GND
L In
R6
R5
R4
R3
100k
R8
2k7
C4
220pF
Phase Switch
SW SPDT
LEVEL
5k POT
R12
45k3
U2
U2
LM324
C17
220nF
C16
220nF
R30
14k
R26
4k7
R33
9k09
1
3
2
2
3
1
R18
13k7
R20
5k6
U1
LO PASS CONTROL 1
20k POT
LO PASS CONTROL 2
20k POT
U2
C10
220nF
C12
100n
C13
47n
C11
47nF
R21
0r Jumper
R19
13k7
R22
5k6
R23
0r Jumper
LoPass Defeat Sw.
SW SPDT
LO PASS CONTROL 3
NOT USED
LO PASS CONTROL 4
NOT USED
13
12
14
13
14
12
3
2
1 7
6
5
6
5
7
8
10
9
1
3
2
1
2
3
1
2
3
4
5
6
7
8
9
11
12
10
R1
4k7
R2
4k7
+15V
-15V
C21
100nF
C20
100nF
C23
100nF
C22
100nF
+15V
GND
GND
SIG
-15V
mute
To/From PWRAMP
R25 33k2
B10 PREAMP (6.3pcb)
5
1 1
MS/LL
3rd Order Hi-Pass
2nd Order LO-PASS
2nd Order LO-PASS: (Moved up 1 octave)
GAIN STAGE
RCA CONNECTOR
DUALRCA
1
2
3
REMOTE Pot
NOT USED
R
L
Binding Post
IN
R
L
OUT
C30
NOT USED
2nd Order Hi-Pass
To Pin 11 U1/U2
To Pin 4 U1/U2
+15V
-15V
+15V
-15V
From PwrAmp
From PwrAmp
NOT USED
1
2
LED1
NOT USED
1
2
Led Harness
NOT USED
LED 2
NOT USED
00232-17
PB10 Revision 1 Schematic Diagrams
PREAMP (PCB version 6.3-7.0)