Download BU-150

Amplifier/Subwoofer
BU-150
BU-150 INTEGRATED CIRCUIT DIAGRAMS
S53AMI/S64AMI - Power Amp module SAFETY PART
+6V 15
1
16
2
17
3
18
4
O/P 19
5
20
6
21
7
22
8
+15V 23
9
v+
V-
+6V
NOTE: THE FOLLOWING PROCEDURES MUST BE FOLLOWED
WHEN INSTALLING NEW S53AMI/S64AMI AMP MODULES:
FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY
RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN
POWERED UP.
v+
1) Align white indent marker on Amp Module with indent marker on main
O/P
PCB; alternately observe position of label on the top of the module;
incorrectly replacing the Module 180° in the PCB slot will result in its
destruction.
2) All AC powered test instruments (meters, oscilloscopes, etc.) must
V-
have a floating ground, i.e. be connected to an isolation transformer.
3) Align and position the Amp Module before soldering.
4) Attach the amp Module with the mounting screws before soldering or
+15V
SD 24
10 SD
FR 25
11 FR
I/P 26
12 I/P
GND 27
13 GND
-15V 28
14 -15V
powering up.
5) Use only rosin-core or non-acid core solder; thoroughly de-flux the
surfaces after soldering.
If the new S53AMI/S64AMI Amp Module has larger mounting hole(s) in
the case, and the stock screws no longer will fit, and screws of the
proper type cannot be obtained locally order:
(2) part# 60301S (screws)
(2) part# 60301N (nuts)
U1 - (LM324) Quad Op Amp
IN 4 +
GND
IN 3 +
IN 3 -
OUT 3
14
13
12
11
10
9
8
+
+
1
2
3
OUT 1
IN 1 -
IN 1 +
Q4, 5 - (MPS A56)
80V PNP Transistor
4
2
V+
5
6
7
IN 2 +
IN 2 -
OUT 2
Q2 - (2N3906)
40V PNP Transistor
3 Collector
2
A +INPUT
3
Q3 - (2N3904)
40V NPN Transistor
A
- +
B
+ -
1
2 3
1
2 3
B OUTPUT
6
B -INPUT
5
B +INPUT
3 Collector
2
Base
1 Emitter
7
Q1 - (MPS A13)
30V NPN(Darl) Transistor
3 Collector
2
Base
1 Emitter
A -INPUT
8 V+
V- 4
3 Collector
2
Base
2 3
1
-
-
+
3
+
1
A OUTPUT
-
-
IN 4 -
4
1
U2 - (TLO 82) Dual Op Amp
OUT 4
2
Base
1 Emitter
1
2 3
1 Emitter
21