Schematics - JBL PB12 Service Manual

1
R27
DUAL RCA
604r
D
R In
C18 330pF
GND
C19 330pF
L In
R24
604r
RCA CONNECTOR
B-POST HiLev I/O
R1
C1
200uF
C
4k7
R R
L L
R2
C2
OUT
IN
200uF
4k7
B
LED 2
NOT USED
Led Harness
LED1
1 1
2 2
NOT USED
NOT USED NOT USED
A
1
2
R11
C6
59k
R28
33k2
220p
6 7
U1
5
R25
33k2
R10
10k
C3 220pF
+15V
R6
10
8
U1
R5
9
R4
-15V
R3 R9
2k7
C4
100k
C5
R8
220pF
2k7 220pF
7
8
9
R22
6k8
10
11
From PwrAmp
From PwrAmp 12
2
5k POT
REMOTE Pot
SW SPDT
1
LEVEL
1
3 2
2
2
3
1
3
Phase Switch
NOT USED
R13
33k2
2nd Order Hi-Pass
R33
12k1
-15V
2
C17 C16
U2
3 LM324
150nF 100nF +15V
C20 C23
C21
R34
120k
100nF
100nF 100nF
2nd Order LO-PASS
0r
R21 SW SPDT
C12 1
13
2
14
U2
3
100nF
12
LoPass Defeat Sw.
R23
0r
C13
100nF
3
R16
R14
68k1
NOT USED
R12
6
C9
7 C7 C8
45k3
U2
5
1k
0r 0r
R35 R15
NOT USED
137k
2nd Order LO-PASS
LO PASS CONTROL 1
C10
R18 20k POT
1 3
6k8
2
100nF
13
1
R19
14
U1
20k POT
6k8
12
5
4 6
C22 LO PASS CONTROL 2 C11
100nF
100nF
R20
6k8
GAIN STAGE
R26
To Pin 11 U1/U2
4k7
C30
NOT USED
R30
10k
9
8
U2
10
To Pin 14 U1/U2
Title
B12 PREAMP (6.3 pcb)
Size Number
Tabloid
Date: 20-Apr-2000
File: T:\PB12 sch Folder\..\PB12 preamp Rev5.sch D rawn By:
3
4
3rd Order Hi-Pass
D
2
1
U1
3
TLO64
R17
56k2
C
B
Un-designated Connector
+15V 1 +15V
mute
2
3 GND
4 GND
5 SIG
-15V 6 -15V
NOT USED
A
Revision
5
Sheet of 1 1
MS/LL
4