Power Amp (Pcb Version 7.2) - JBL PowerBass PB12 Service Manual

1 2 3
I

Power Amp (PCB version 7.2)

H
CONN 2
To U1 Pin 11
+15V 6 +15
mute 5
GND 4
GND 3
SIG 2
-15V 1 -15
C24
NOT USED To U1 Pin 4
330nF
R21
G
4K7
C25
NOT USED
R22
42K2
R23
CONNECTOR
187k AV SW
4
F
12 1
2
14
U1
3
13
TLO64
NOT USED
11
R24
NOT USED
R25
NOT USED
E
R32
47k
10
R33
9
D
23k7
C26
10nF
C
*ALL SAFETY PRECAUTIONS IN THIS MANUAL SHOULD BE
FOLLOWED DURING SERVICING. COMPONENTS IDENTIFIED
!
WITH THE IEC SYMBOL IN THE SCHEMATIC DIAGRAM ARE
DESIGNATED COMPONENTS IN WHICH SAFTETY CAN BE OF
SPECIAL SIGNIFICANCE WHEN REPLACING A COMPONENT
!
IDENTIFIED WITH
.
B
A
1 2 3
4 5 6
SIGNAL LED & AUTO MUTE
TLO64
4 C41
3 R50
1
U1
2
2k2
11 1uF
C40
R40
R41
1k 1000k
10uF
C6
R7A R7B R7C
10k 10k 10k
100nF
R26
1N4148
R27
D7
6k8
10k
R28
1k2 R1A
7k5
R29
1k2
R31 R30
D8
47k 10k
1N4148
R35
4
R9
220k
R34
8
U1
NOT USED
10k
TLO64 C32
22uF
C27
11
3n3F
C1
2200uF
R8B
R8A
10k 10k
C2
2200uF
4 5 6
7 8 9
R46
1000k
R45
470K
4
1N4148
5
D14
U1
6
TLO64
D11
1N4148
11
C42
R43
1000k
D12 100uF
1N5242B R42
R44
1N5242B
D10
100k
22k
D6 R6
47R
1N5234B
S64
+6V
D5
1N4735A
C20
1N5265B
V+
D3
UVLO 220nF
R1B R1C
7k5 7k5
D4
R3 O/P
8M2
R4
33k
1N4938
V-
L2
C3
+15V
100nF
S/D
R5
FR
C21 56k2
D1
100nF
I/P
GND
D2
C22
-15V
100nF
MODULE
1N4744A
DIODE BRIDGE
CMC
V+
V-
R2A R2B R2C
7k5 7k5 7k5
3m6H
RS604
43
7 8 9
10 11 12
Not Used
LED 3 LED Harness
L5
1 1
7
2 2
L6
Molex 2
Not Used Molex 2
Header Socket
D13
1N4148
R47
10k
R49
R48
4k7 4k7
Q1
2N5457
SHORT CIRCUIT PROTECT
R13
47k
Q11
R12
2N5401
1k
Q12
Q10
2N4401
R11
2N5401
1k
R10A R10B R10C
0.1R 0.1R 0.1R
L4
8u5H
C11
C10
4u7F
330nF
L3
L1
220uH
8u5H R15 8u5H
NOT USED
80116
!
3AG FUSE
2A SloBlo
TRX TO TRANS. PRI.
MCI 4632
To AC
QUICK FIT TERMINAL
To GND
To AC
TRANSFORMER IS MOUNTED ON FACEPLATE
30521
30535 !
! AC
QUICK FIT TERMINAL
C7A
CX
100nF GND
Not Used
QUICK FIT TERMINAL
C7B
AC
100nF
QUICK FIT TERMINAL
30521
!
Part No:
Revision 7.2 (PWRAMP)
Date:
25-Oct-2001
Drawn:
MS/LL
Rev. Sheet:
2
1
10 11 12
13 14 15
LED1/2 Preamp
LED1/2 Preamp
On Harness On Harness
Bi-Clr LED Bi-Clr LED
R14
3k3
SPK 1
CZ
QUICK FIT TERMINAL
100nF
SPK 2
CW
QUICK FIT TERMINAL
NOT USED
80117
!
On Faceplate
SW SPST 70151
LIVE !
80105
!
QUICK FIT TERMINAL
Power Cord
2
of
13 14 15
I
H
G
F
E
D
C
B
A