Block Diagram Revision 2 - JBL PowerBass PB12 Service Manual

PB12 Block Diagram Revision 2 Only
1
A
SPEAKER LEVEL
INPUT
Rin
Lin
B
Rout
Lout
Line Level
Input
C
D
E
NOTE :
120 VAC T2A-250V
F
230 VAC T1.25A-250V
1
2 3
VOLUME CTRL
DIF. AMP SUMMI NG AMP
SIGNAL SENSE
MUTE
EXTERNAL LED INDICATORS
2 3
4 5
RevNo Revision note
PHASE CTRL
SWITCH
AMP STAGE
DC OFFSET
PROTECTION
THERMAL
PROTECTION
ATO CURRENT
SIGNAL SENEING PROTECTION
* FUSE LINEAR
POWER SUPPLY
+15V SW
CONTROLLED
REGULATOR
32
6 7
HPF LPF LPF
Variable
12dB/Octave 12dB/Octave 12dB/Octave
SUMMI NG AMP
LIMITER /
LPF
MUTE
CLASS D
OUTPUT-RELAY
AMPLIFIER
5.6 OHMS
MUTE
6 7
8
Date Signature Checked
A
B
LFE
NORMAL
C
D
E
F
8