BU-150

BU-150
BU-150
Powered Subwoofer
SERVICE MANUAL
Infinity Systems Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
1-800-553-3332
A Harman International Company
Rev A 3/2000
Amplifier/Subwoofer
SAFETY INFORMATION
BU-150
Warning
Leakage/Resistance Check
Any person performing service of this unit will be exposed to
hazardous voltages and the risk of electric shock. It is
assumed that any person who removes the amplifier from this
cabinet has been properly trained in protecting against
avoidable injury and shock. Therefore, any service
procedures are to be performed by qualified service personal
ONLY!
Before returning the unit to the customer, perform a leakage
or resistance test as follows:
Caution
This unit does not have a power switch. Hazardous voltages
are present within the unit whenever it is plugged in.
Before the amplifier is plugged in, be sure its rated voltage
corresponds to the voltage of the AC power source to be
used. Incorrect voltage could cause damage to the amplifier
when the AC power cord is plugged in. Do not exceed rated
voltage by more than 10%: operation below 90% of rated
voltage will cause poor performance or may shut the unit off.
Leakage Current. Note there is no power switch on this unit.
When the power plug is plugged in, the unit is live. Connect
the unit to its rated power source. Using an ammeter,
measure the current between the neutral side of the AC
supply and chassis ground of the unit under test. if leakage
current exceeds 0.5mA, the unit is defective. Reverse the
polarity of the AC supply and repeat.
Resistance. Measure the resistance from either side of the
line cord to chassis ground. If it is less than 500k ohms, the
unit is defective.
WARNING! DO NOT return the unit to the customer if it fails
one of these tests until the problem is located and corrected.
List of Safety Components Requiring
Exact Replacements
F1
Fuse SLO BLO 1.5A 250V 20mm.
UL approved
PWRCORD
SPT-2 or better with polarized plug, UL
approved wired with the hot side to fused side.
Use with factory replacement panel strain relief
only.
T1
Transformer. Use only factory replacement.
DBR
Bridge diode. Use only factory replacement.
C1, 2
2200uF, 100V electrolytic filter caps. Be sure
replacement part is at least the same working
voltage and capacitance rating. Also the lead
spacing is important. Incorrect spacing may
cause premature failure due to internal cabinet
pressure and vibration.
C6
4.7uF 100V electrolytic radial
S64AMI
Power output module. Use only factory
replacement
Faceplate
Faceplate. Use only factory replacement
Air leak cover Use only factory replacement
CMC1
Use only factory replacement
L1
Use only factory replacement
Fuse PCB
Use only factory replacement
Main PCB
Use only factory replacement
2
BU-150
Amplifier/Subwoofer
TABLE OF CONTENTS
SAFETY INFORMATION ..................................................2
BU-150 AMPLIFIER ASSEMBLY EXPLODED VIEW....15
GENERAL SPECIFICATIONS..........................................3
BU-150 PCB (Version 3.52) Component Side Trace ....16
DETAILED SPECIFICATIONS .........................................4
BU-150 PCB (Version 3.52) Solder Side Trace ............17
CONTROLS AND THEIR FUNCTION .............................6
BU-150 PCB (Version 3.53) Component Side Trace ....18
BU-150 CONNECTIONS .................................................7
BU-150 PCB (Version 3.53) Solder Side Trace ............19
OPERATION ...................................................................11
BU-150 ELECTRICAL PARTS LIST ..............................20
BU-150 TEST SET UP AND PROCEDURE..................12
BU-150 INTEGRATED CIRCUIT DIAGRAMS ...............21
BU-150 POWER AMP MODULE TESTING
FLOW CHART ................................................................13
BU-150 SCHEMATIC 1 of 2...........................................22
BU-150 SCHEMATIC 2 of 2...........................................23
BU-150 PACKING & CABINET ASSEMBLY .................14
GENERAL SPECIFICATIONS
Frequency Response (63dB) . . . . . . . . . . . . . . . . . 28Hz – 150Hz
Output (RMS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200W
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15" Woofer
Crossover Frequency . . . . . . . . . . . . . . . . . . . . . . . 50Hz ~ 150Hz (continuously variable)
Dimensions (H x W x D) . . . . . . . . . . . . . . . . . . . . . 17 ) " x 17 ) " x 17 ) " (451 x 451 x 451mm)
Add 1) " (4.5cm) for feet.
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 lbs/20 kg
Refinements may be made on occasion to existing products without notice,
but will always meet or exceed original specifications unless otherwise stated.
3
Amplifier/Subwoofer
LINE VOLTAGE
US 120vac/60Hz
Parameter
BU-150
DETAILED SPECIFICATIONS
Yes/
No
Yes
Hi/Lo Line
Nom.
Unit
Notes
108-132
120
Vrms
Normal Operation
Spe
cific
atio
n
Unit
Test
Limits
Conditions
Notes
Class D Preferred...Sink
required for Class AB
Z-curve required
Amp Section
Type (Class AB, D,
other)
Load Impedance
(speaker)
Rated Output Power
THD
8
Ohms
n/a
Nominal
200
1
Watts
%
120
2
1 input driven
22k filter
THD @ 1 Watt
DC Offset
Damping factor
0.5
<20
>80
%
mV-DC
DF
0.5
30
>50
22k filter
@ Speaker Outputs
Input Sensitivity
Input Frequency
Line Input
35
265
Hz
mVrms
±2dB
Speaker/Hi Level Input
7
Vrms
±2dB
Signal to Noise
SNR-A-Weighted
100
dBA
90
SNR-unweighted
75
dBr
70
SNR rel. 1W-unweighted 65
(22k)
Residual Noise Floor
2
dBr
55
mVrms
3
Residual Noise Floor
1.5
mVrms(max)
2
Input Impedance
Line Input
Speaker/Hi Level Input
10K
5K
ohms
ohms
n/a
n/a
Filters
Low Pass (fixed or
variable)
Low Pass filter (point or
range)
Slope
Q
Subsonic filter (HPF)
Slope
Q
Varia
ble
60-1
80
24
1
25
12
1
D
n/a
Input voltage 120 VAC, 60 Hz
120W (Power Bandwidth
30-100Hz) @ 120 VAC
Measured across amplifier
outputs
Nominal Freq.
To Rated Power/
Vol @ Max
To Rated Power/
Vol @ Max
1 input driven
1 input driven: AP source Z =
600 ohms
1 input driven: AP source Z =
25 ohms
Relative to rated
A-Weighting filter
output
Relative to rated
22k filter
output
relative to 1W
22k filter
Output
Volume @max, using RMS reading DMM/VOM (or
A/P) , BW <20KHz
Volume @max, w/ A/P Swept Bandpass
Measurement (Line freq.+ harmonics) , BW<20Khz
Nominal
Nominal
0dBr = 1w @ 50Hz
Hz
±2dB
-3dB Point
dB/Octave
Damping
Hz
dB/Octave
Damping
n/a
n/a
±2dB
n/a
n/a
-3dB Point
4
BU-150
Amplifier/Subwoofer
Limiter (yes/no)
THD at Max. Output
Power
Features
Phase Switch (yes/no)
Volume pot Taper
(lin/log)
yes
10
%
functional
ck.
YES
—
functional
ck.
functional
ck.
LOG —
Input Configuration
Line In (L&R)
LR
—
—
Spkr/Hi Level In
L,R
—
100
Hz
(L&R)
Spkr Out: Hi Pass Filter
Signal-Present LED
Yes
Signal-Present Input
35
Freq.
Signal-Present Level line 30
in
functional
ck..
functional
ck..
functional
ck..
Maximum Output
Power
Maximum THD as a result of
limiting.
45 deg additional phase
shift/switch op.OK
Enabled w/Line/Spkr
Input Select Switch
8 ohm Satellite: 6dB/oct passive xover 200 Uf cap. Non
polarized
Hz
Nominal
mV
Zo=600 Ohms
35Hz into Line
Input w/ 1 ch.
Driven
35Hz into Speaker
Input w/ 1 ch.
Driven
Amp connected and AC on, then input signal
applied
T before muting,
after signal is
removed
Signal-Present Speaker
-in
2.6
V
Signal-Present Turn-on
time
Auto Mute/ Turn-OFF
Time
1
sec.
>3
min.
Power on Delay time
1
sec.
3
AC Power Applied
Transients/Pops
Signal-Present Transient
Turn-on Transient
5
1
mV-peak
mV-peak
n/a
2v-pp
Turn-off Transient
2
mV-peak
4v-pp
@ Speaker Outputs
@ Speaker Outputs AC Line cycled from OFF to
ON
@ Speaker Outputs AC Line cycled from ON to
OFF
Efficiency
Stand-by Input Power
20
Watts
28
210
Watts
220
95.2
4%
%
54.55%
Amps
functional
ck..
functional
ck..
2
Power [email protected]
power
Efficiency
Protection
Short Circuit Protection
YES
Thermal Protection
YES
Line Fuse Rating
2
@ nom. line
voltage
@ nom. line
voltage
Relative to rated
output
Direct short at
output
@1/8 max
unclipped Power
Input Line voltage 120 VAC
Power transformer 85 deg C.
Slo-Blo type
5
BU-150
Amplifier/Subwoofer
CONTROLS AND THEIR FUNCTION
1. High-Level input and Output terminals
SPKR
IN
SPKR
OUT
2. Low-Level Input Jacks: connect to preamplifier outputs
3. Low Pass: This is the crossover frequency control
which determines the upper-corner roll-off points.
1
4. Power-On indicator
5. Phase: 0/180 switch to change audio-signal polarity.
R
R
L
L
6. Level: This controls the volume level of the subwoofer.
2
3
4
5
6
L
R
Line Input
Low
Pass
50
Phase
0o
150
Power
180o
Level
Min
Max
Digital Technology
BU-150 Powered Subwoofer
120V
60Hz
250W
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
6
Amplifier/Subwoofer
BU-150 CONNECTIONS
BU-150
When connecting your subwoofer make sure you turn
all the power off.
There are several ways to connect your subwoofer.
Read this section carefully to determine which method
is best suited for your installation.
The subwoofer may be fed directly with a low-level
signal taken from a preamplifier's output by using the
second set of output jacks on the rear of the
preamplifier (See Figure 1). If a preamplifier has only
one set of outputs, you may use two (2) “Y” connectors
(See Figure 2) to connect the subwoofer. Use
standard shielded leads terminated at each end with
male RCA connectors. Connect one end of each
stereo pair of leads to the preamplifier's left and right
outputs and connect the other end to the
corresponding left and right LOW-LEVEL INPUTS (1)
on the subwoofer.
If you are using a tube preamplifier and the connecting
leads will be longer than 10 feet (3 meters), we
recommend not using the above connection method. A
tube preamplifier may not be able to handle the
capacitance introduced by leads more than 10 feet in
length. Instead, try using the high-level connection
methods listed on pages 5-7.
Figure 1. - A low-level signal can be used from a
preamp's output by connecting second set of
output jacks to the rear of your amplifier.
Figure 2. - You can use this method (2“Y”
connectors) if your preamp has only one set
of outputs.
7
Amplifier/Subwoofer
BU-150
When using a single subwoofer, you MUST use a pair of stereo low-level leads from your preamplifier's outputs. When using
two subwoofers, one for the left and another for the right channels, connect the left preamplifier output to BOTH the left and
right LOW-LEVEL INPUTS of the subwoofer used for the left channel by using a Female-to-Male “Y” connector at the
subwoofer's output. Connect the right-channel preamplifier output to both jacks of the right-channel subwoofer in the same
manner (See Figure 3). If the preamplifier has a mono subwoofer output, you'll also need a Male-to-Female “Y” connector to
split the mono signal to the subwoofer pair (See Figure 3).
Figure 3. - Use this method when using single subwoofer or two subwoofers.
The subwoofer may be connected to your system using the
HIGH-LEVEL INPUTS (4) on the plate located on the rear
panel of the subwoofer. Use speaker wire, maintaining
proper polarity (+ to + and - to -). Attach the speaker wire to
the left and right HIGH-LEVEL INPUTS on the subwoofer
and the other ends to the proper left and right OUTPUTS on
your amplifier or receiver (See Figure 4).
If you plan to use two subwoofers (one for the left and the
other for the right channel), connect wires from the left and
right OUTPUT on your power amplifier or receiver and
attach the other ends to the corresponding HIGH-LEVEL
INPUTS on each subwoofer. Observe polarity (See Figure
6).
Figure 4. - Use this method when using a single
subwoofer.
8
Amplifier/Subwoofer
BU-150
Figure 5. - Use this method when using two
subwoofers.
Figure 6. - Use this method when connecting
one subwoofer to satellites.
Depending on whether you are using one or two
subwoofers, connecting your satellites can be
accomplished in one of two ways. If you are using a
single subwoofer with a pair of satellites, connect
them as shown in Figure 7.
9
Amplifier/Subwoofer
BU-150
Figure 7. - Use this method when
connecting two subwoofers to
satellites.
If you are using two subwoofers as a
stereo pair with a pair of satellites, connect
them as shown in Figure 7.
The subwoofer has a variable frequency
control that can be used to block unwanted
frequencies (between 50 - 150Hz) from
being reproduced by the subwoofer.
When you set this control depends on the
low-frequency capabilities of your satellite
speakers. Adjust this knob to the lowest
frequency that you satellite speakers were
designed to reproduce (refer to Operation,
step 7).
10
Amplifier/Subwoofer
OPERATION
BU-150
Setting the Controls
Room Placement
1. Initially set the subwoofer's Volume control to the minimum
position.
8. The room placement of the subwoofer is the most critical
aspect of its installation. It will be necessary for you to try
various locations in your listening room before you choose
the final location. Some possible starting points include:
behind the right channel satellite speaker, along the back
wall between the satellites, along a side wall (but not too
close to a corner), or behind a couch or a chair.
2. Initially set the subwoofer's Crossover Frequency control to
12 o'clock.
3. Set the subwoofer's Phase switch to the “NOM” position
Turn the Power On
4. Turn on the entire
source.
audio system and play any music
5. Turn the Volume control to its mid position. If no sound
emanates from the subwoofer, check the AC line cord and
input cables. Are the connectors on the cables making proper
contact? Is the AC plug connected to a “live” receptacle?
Adjusting the Volume
6. Set the overall volume control of the preamplifier or stereo
to a comfortable level. Adjust the subwoofer's Volume control
until you obtain a pleasing blend of bass. Bass response
should not overpower the room but rather be adjusted so
there is a harmonious blend across the entire musical range.
Many users have a tendency to set the subwoofer volume too
loud following the belief that a subwoofer is there to produce
lots of bass. This is not entirely true. A subwoofer it there to
enhance bass, extending the response of the entire system
so the bass can be felt as well as heard. However, overall
balance must be maintained; otherwise, the music will not
sound natural. An experienced listener will set the volume of
the subwoofer so its impact on bass response is always there
but is never obtrusive.
The Crossover Frequency Controls
7. The Crossover Frequency control sets the high-frequency
roll-off, adjustable from 50 to 150Hz. Where you set this
control depends on the low-frequency capabilities of your
satellite speakers, system placement, and other factors
affecting the mid-bass region. Turn the control UP
(clockwise) until you feel there is too much mid-bass
information (around 100Hz), then back the control down a bit
until that area sounds more natural. To hear more low bass,
turn the Crossover Frequency control DOWN a bit and the
Volume control UP by about the same amount. This will
increase low bass while leaving the mid-bass sounding the
same as it did before the adjustment. To reduce low bass
without changing midbass, turn the Crossover Frequency
control UP and the Volume control DOWN. Switch the Phase
switch between “NOM” and “REV” positions while listening to
music. The selection that sounds the best is the correct
adjustment for your system.
In general, the closer the subwoofer is to wall and corners,
the greater the effect of low-frequency enhancement.
Experiment with the Crossover Frequency and Volume
controls in different locations until you are pleased with the
result you obtain from your particular application.
A Word of Advice
The Low-Frequency Roll-off and Volume controls may be
set anywhere within their rotation. However, it will be a most
unusual circumstance if you have to set the Volume control
completely clockwise. This may indicate an unbalanced
condition in your system (too much bass) or an especially
large room, or room placement may not be correct. Try
several other locations before concluding that the Volume
control must be set at maximum.
A Word About Tone Controls
The tone controls on your electronic components
(preamplifier, receiver, etc.) should be used with the utmost
discretion. Excessive boost can create severe power
demands on your power amplifier. Maximum bass boost
can create a demand for literally hundreds of watts in the
bass region, whereas in the “flat” position, or with the tone
controls switched out of the system, your average listening
level may be impressively and realistically loud at less than
10 watts. The remaining power capacity required is on
reserve for power peaks on sharp transients and powerful
crescendos.
11
Amplifier/Subwoofer
BU-150
BU-150 TEST SET UP AND PROCEDURE
AC VOLT METER ( 6V )
BU-150
UNDER TEST
CD PLAYER
SPKR
IN
SPKR
OUT
LINE LEVEL
OUTPUT
FROM
AMPLIFIER
PRE AMP
R
R
L
L
FROM PRE AMP
AMPLIFIER
L
R
Line Input
SPEAKER LEVEL
Low
Pass
50
Phase
General Function
Turn on generator, adjust to 50mV, 50 Hz.
3.
Plug in UUT; red LED should be ON. Turn VOLUME control
full clockwise. Low Pass control should be set fully clockwise (150)
4.
LED should turn Green; immediate bass response should be
heard and felt from port tube opening.
5.
Turn off generator, turn VOLUME control fully counterclockwise,
disconnect RCA cables.
6.
Connect one pair of speaker cables to either high level input
terminal on UUT. Cables should be connected to
an integrated amplifier fed by the signal generator.
7.
Turn on generator and adjust so that speaker level output is
2.0V, 50 Hz. Turn VOLUME control full clockwise.
8.
Green LED should light, immediate bass response should be
heard and felt from the port tube opening.
Power
180o
Level
UUT = Unit Under Test
1. Connect both right and left line level inputs (RCA) to signal
generator and UUT. Use Y-cable if necessary from
mono source. VOLUME control should be full counterclockwise.
2.
0o
150
Min
Max
Digital Technology
BU-150 Powered Subwoofer
120V
60Hz
250W
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
Sweep Function
1.
Follow steps 1-4 above, using a sweep generator as a signal source.
2.
Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any
other noises. If any unusual noises are heard, remove driver and test.
Driver Function
1.
Remove driver from cabinet; detach + and - wire clips.
2.
Check DC resistance of driver; it should be 6.4 ohms.
3.
Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by
a signal generator and adjust so that speaker level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
12
BU-150
Amplifier/Subwoofer
BU-150 POWER AMP MODULE TESTING FLOW CHART
START
Check V+,
V-, +/-15V
voltage to
module
Resistance
check
between V+
V- and O/P
O/P to GND
should > 5K
No
OK
Yes
No
OK
Replace
Module
Check
transformer,
CMC,
rectifier, C1,
C2, D9, D10,
R16, R17
Check 6V to
module
measure to V-
Yes
No
Power up with
no signal I/P
LED RED
OK
Check D6,
R9, R46
Yes
Check fuse
transformer,
CMC,
rectifier, C1,
C2
No
OK
Yes
Check I/P of
module to
GND 0V D.C.
Check S/D
voltage to
module (5V)
measure to VNo
OK
No
OK
Yes
Check
switching
frequency
100KHz
H
+/-10%
~1Vpp
Check C29
and Pre-AMP
Check D1,
R1, Q3, Q4,
Q5 and SCP
Yes
Check O/P to
module for
80Vpp square
wave
measure to
GND
No
OK
Yes
No
OK
Yes
Check L1,
L2, L3, L4,
C6, C24
Power AMP
OK
END
13
Amplifier/Subwoofer
BU-150 PACKING & CABINET ASSEMBLY
BU-150
SCREWS (4)
FEET PART
(Set of 4)
#200310
FOOT BASE
(Each)
#200870
BU-150 CABINET ASSEMBLY
SCREWS (8)
TRIM RING
#200401
15" WOOFER
#200400
CABINET
NOT FOR
SALE
SCREWS (10)
TOP STYROFOAM
COVER PAD
#200465
SP
KR
OU
T
R
SP
KR
IN
R
L
L
L
Lin
Lo
Pa w
ss
Ph
as
50
e
15
0o
Le
R
e Inp
ut
ve
Mi
Pow
CA
REDU
EXPO
RISK
CE
SE THE
THIS
Po
l
BU
-15 Digita
0 l
Ma
UT
OF
DO ELEC
NOT TRIC
we
r
n
Tec
ere
hno
IO
N
x
logy
d Sub
120
60HV
250 z
W
TO
0
180o
wo
ofe
RISK
OPENSHOC
EQUI
OF
PMENELEC
K
T TO TRIC
RAIN SHOC
OR K.
MOISDO
NOT
TURE
r
TOP STYROFOAM
RAIL PADS
(2 per carton)
#200460
AMPLIFIER
ASSEMBLY
BU-150
SUBWOOFER
FEET PAD (4)
STICKERS
#200252
PLASTIC BAG
WARRANTY
CARD
#333715-001
OWNER'S
MANUAL
#200230
BU-150 PACKING
BU
OW -15
0
MANER
NU 'S
AL
BOTTOM
STYROFOAM
RAIL PADS
(2 per carton)
#200470
BOTTOM
STYROFOAM
CENTER PAD
#200475
CARTON
#200420
14
BU-150
Amplifier/Subwoofer
BU-150 AMPLIFIER ASSEMBLY EXPLODED VIEW
A
C
B
5
1
D
Ref.#
R
L
2
2
70317
Face Plate (Aluminum) SAFETY PART
1
3
70318
PCB Support SAFETY PART
1
4
70150
Phase Switch
1
5
70170
#4 x 0.5" Screws to secure input jacks
5
6
70171
#10 x 1" machine screw Bolts
4
5
7
70172
#10 Keps Nut
4
13
8
70173
#6 x 0.5" Screws for fuse PCB
2
9
80124
Transformer MCI4700 SAFETY PART
1
10
80123
250V, 1.5A, T type SLO BLO Fuse
SAFETY PART
1
11
80112
Motherboard SAFETY PART
1
12
108115
High level input and output terminals
1
13
108320
Dual RCA input jacks
1
14
70305
Pwr Cord Strain Relief SAFETY PART
1
15
80105
Power cord, 2 conductor SAFETY PART
1
12
L
5
2
L
R
Line Input
1
Low
Pass
50
4
Phase
3
150
Power
0o 180o
1
Level
Min
Max
BU-150
Amplifier Assembly
Exploded View
7
4
Qty
Knobs
SPKR
IN
R
Description
Part #
A70302
1
SPKR
OUT
E
9
1
2
3
4
10
3
5
11
14
6
5
6
15
6
7
A
7
2
B
C
D
E
15
Amplifier/Subwoofer
2
3
4
5
2
3
4
5
BU-150
F
C
D
E
Version 3.52 - Component Side Trace Layer
1
A
A
B
B
C
D
E
F
G
G
1
BU-150 PCB (Version 3.52) Component Side Trace
16
D
E
F
E
F
G
5
5
D
4
4
C
3
1
3
B
G
2
A
C
Version 3.52 - Solder Side Trace Layer as viewed through the board
B
2
1
A
Amplifier/Subwoofer
BU-150 PCB (Version 3.52) Solder Side Trace
BU-150
17
Amplifier/Subwoofer
2
3
4
5
2
3
4
5
BU-150
F
C
D
E
Version 3.53 - Component Side Trace Layer
1
A
A
B
B
C
D
E
F
G
G
1
BU-150 PCB (Version 3.53) Component Side Trace
18
D
E
F
E
F
G
5
5
D
4
4
C
3
1
3
B
G
2
A
C
Version 3.53 - Solder Side Trace Layer as viewed through the board
B
2
1
A
Amplifier/Subwoofer
BU-150 PCB (Version 3.53) Solder Side Trace
BU-150
19
Amplifier/Subwoofer
REF #
PART #
BU-150 ELECTRICAL PARTS LIST
DESCRIPTION
QTY
BU-150 PCB REV 3.5
Resistors
R1
R2
R3
R4
R4a/b/c
R5
R6
R7
R8
R9
R14
R15
R16, 17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R30, 31
R32
R33
R35
R36
R37
R39
R40
R42, 43
R44, 45
R46
R48
R49
R50
R51
R52
R53, 54, 55, 56
R57
R58
R59
R60
Crossover
Level
BU-150
40702
40466
40458
40417
40105
40420
40420
40449
40417
40464
40409
40406
40465
40424
40466
40405
40443
40449
40461
40418
40417
40701
40440
40441
40415
40100
40422
40446
40446
40467
40417
40406
40409
40104
40468
40415
40100
40417
40456
40106
40456
40469
40405
40443
40425
40402
6.8MW 1/4W ±5% carbon film
1
8.66kW 1/4W ±1% metal film
1
43.2kW 1/4W ±1% metal film
1
47kW 1/4W ±5% carbon film
1
0.1W 1.2W ±5% 3pcs.
1
1kW 1/4W ±5% carbon film
1
1kW 1/4W ±5% carbon film
1
3.3kW 1/2W ±5% carbon film
1
47kW 1/4W ±5% carbon film
1
9.1kW 10W ±5% power resistor Safety part 1
10kW 1/4W 5% carbon film
1
100kW 1/4W 5% carbon film
1
2.4kW 7W ±5% wirewound Safety part
2
330kW 1/4W ±5% carbon film (LED sens) 1
3.9kW 2W ±5% carbon film
1
4.7kW 1/4W ±5% carbon film
1
39kW 1/4W ±5% carbon film
1
3.3kW 1/2W ±5% carbon film
1
20kW 1/2W ±5% carbon film
1
22kW 1/4W ±5% carbon film
1
47kW 1/4W ±5% carbon film
1
1.0MW 1/4W ±5% carbon film
1
6.81kW 1/4W ±1% metal film
1
13.7kW 1/4W ±1% metal film
2
470kW 1/4W ±5% carbon film
1
332W 1/2W ±5% carbon film
1
301kW 1/4W ±1% metal film
1
8.66kW 1/4W ±1% metal film
1
8.66kW 1/4W ±1% metal film
1
30.1kW 1/4W 1% metal film
1
47kW 1/4W 1% carbon film
1
100kW 1/4W ±1% carbon film
2
10kW 1/4W ±5% carbon film
2
4.7W 1/4W ±5% carbon film
1
7.32kW 1/4W ±1% metal film
1
470kW 1/4W ±5% carbon film
1
332W 1/4W ±5% carbon film
1
47kW 1/4W ±5% carbon film
1
2.7kW 5W ±5% wirewound Safety part
1
100W 2W 5% carbon film
4
2.7kW 5W ±5% wirewound Safety part
1
5.49kW 1/4W ±1% metal film
1
4.7kW 1/4W ±5% carbon film
1
39kW 1/4W ±5% carbon film
1
50kW 1/4W ±10% Double Log Pot
1
5kW 1/4W ±10% Single Linear Pot
1
C1
30710
C2
30710
2200uF 100V +80/-20% Electrolytic Radial
Safety part
2200uF 100V +80/-20% Electrolytic Radial
Safety part
Capacitors
1
1
REF #
PART #
DESCRIPTION
QTY
C3
C4, 5
30514
30504
C6
30709
C7
C7a/b
C8, 9
C11
C13
C14
C15, 16
C17
C18
C19
C20
C21
C22, 23
C24
C26
C27
C29
30510
30505
30504
30702
30507
30511
30707
30502
30517
30524
30504
30522
30502
30523
30508
30513
30711
C31
C33
CW
CZ
30525
30503
30505
30505
47nF 50V +80/-20% Mono-ceramic axial
100nF 50V +80/-20% Mono-cer rad 0.2"
/ax 0.3"
4.7uF 100V +80/-20% Electrolytic Radial
NP Safety part
33n 50V ±10% Mono-ceramic axial
100n 100V ±20% Metal Polyester Rad
100nF 50V +80/-20% Mono-ceramic radial
100uF 35V +80/-20% Electrolytic Radial
10nF 50V ±20% Mono-ceramic axial
330nF 50V ±10% Mono-ceramic axial
220uF 50V ±20% Electrolytic Radial
100nF 50V +80/-20% Mono-ceramic radial
68nF 50V ±10% Mono-ceramic axial
82nF 50V ±10% Mono-ceramic axial
100nF 50V ±10% Mono-ceramic axial
100nF 250V ±10% Polyester film
100nF 50V +80/-20% Mono-ceramic axial
330nF 100V +80/-20 Mono-ceramic axial
10nF 50V ±10% Mono-ceramic axial
3.3nF 50V ±10% Mono-ceramic axial
22uF 35V +80/-20% Electrolytic Radial
Safety part
120nF 50V ±10% Mono-ceramic axial
2.2nF 50V ±20% Mono-ceramic axial
100nF 100V ±20% Polyester film
100nF 100V ±20% Polyester film
50111
50106
50104
50102
50103
50105
50100
ZENER 1N4763A 91V ±5% 1W
Dual Cir LED (2 legged)
1N4148 100V 0.1A
ZENER 1N4749A 24V ±5% 1W
ZENER 1N5234B 6.2V ±5% 0.5W
ZENER 1N4744A 15V ±5% 1W
Bridge Rect 200V 4A Safety part
2
1
1
2
1
60151
60152
60153
60155
MPS A13 30V NPN (Darl)
2N3906 40V PNP, 2N4402 alternate
2N3904 40V NPN, 2N4401 alternate
2N5401 80V PNP
1
1
1
2
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
Diodes
D1
LED 1 or 2
D2, 4
D3
D6
D9, 10
DBR
1
Transistors
Q1
Q2
Q3
Q4, 5
Integrated Circuits
U1
U2
60100
60101
60302
LM324 Quad OpAmp +/-15V
1
TLO 82 Dual OpAmp +/-15V
1
S64AMI Power Amp module SAFETY PART
80100
80121
80122
80122
80122
mc4438 Safety part
mc4642 Safety part
Ferrite bead
Ferrite bead
Ferrite bead
Inductors
CMC1
L1
L2
L3
L4
1
1
1
1
1
20
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
Amplifier/Subwoofer
BU-150
3
4
3
4
F
E
D
C
B
A
5
A
B
C
D
E
F
BU-150 Schematic 1 of 2
G
2
2
5
1
G
1
BU-150 SCHEMATIC 1 of 2
22
Amplifier/Subwoofer
BU-150
2
3
4
5
2
3
4
5
C
D
E
F
G
1
A
B
BU-150 Schematic 2 of 2
A
B
C
D
E
F
G
1
BU-150 SCHEMATIC 2 of 2
23
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