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BU2
Powered Subwoofer
A Harman International Company
Part No.: 1112-BU2 11/98
Technical Manual
Technical Manual
INFINITY SYSTEMS INC.
250 Crossways Park Drive
Woodbury, New York 11797
1
Powered Subwoofer BU2
BU2 SPECIFICATIONS
Driver ................12"Woofer
Nominal Impedance ............4Ω
Enclosure Design.............Tuned Port
Amplifier Power .............100watts RMS
Frequency Response ...........30Hz-150Hz(±3dB)
Crossover Frequency ...........50to200HzContinuously Variable
Inputs
Line Level ...............RCAjacks
High Level ...............(Speaker) Input terminals
Outputs................Full range Speaker
Sensitivity
Low Level ...............70mV
High level ...............1.7V
Input Impedance
Low Level ...............12KΩ
High level ...............4.7KΩ
Auto-Off Delay .............8minutes
Dimensions
Inches ................14½x14½x14½"
Metric ................36.8 x 36.8 x 36.8cm
plus 1¼" (32mm) for feet
Shipping Weight .............43lbs/19.5 Kg.
Occasional refinements may be made to existing products without notice, but will always meet or
exceed original specifications unless otherwise stated.
TABLE OF CONTENTS
BU2 SPECIFICATIONS .................................................1
TABLE OF CONTENTS.................................................1
BU2 CONTROLS AND THEIR FUNCTION ..................2
BU2 TEST PROCEDURE..............................................3
BLOCK DIAGRAM .........................................................4
BU2 CABINET EXPLODED VIEW ................................5
AMPLIFIER EXPLODED VIEW .....................................6
BU2 MECHANICAL PARTS LIST .................................7
BU2 ELECTRICAL PARTS LISTS ................................8
BU2 PACKAGING EXPLODED VIEW ........................10
INTEGRATED CIRCUIT DIAGRAMS..........................11
PCB (TOP VIEW, component side).............................12
PCB (BOTTOM VIEW, solder side).............................13
PREAMP/CROSSOVER SCHEMATIC 120V ..............14
AMPLIFIER SCHEMATIC 120V ..................................15
PREAMP/CROSSOVER SCHEMATIC 230V ..............16
AMPLIFIER SCHEMATIC 230V ..................................17
THIS MANUAL IS FOR THE BU2 REVISION WITHOUT AN EXTERNAL POWER SWITCH
(120v Only - 230v version has a power switch)
2
Powered Subwoofer BU2
BU2 CONTROLS AND THEIR FUNCTION
LOW LEVEL
INPUT
R
L
L
L
R
R
POWER
50
60
200
120
80
180
VOLUME
CONTROL
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD-DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
NOT SUITABLE FOR IN-WALL MOUNTING
120V~60Hz 230W
MODEL BU2
ON REVOFF NOM
STANDBY
RED
HIGH LEVEL INPUT
HIGH LEVEL OUTPUT
FREQUENCY
Hz
AUTO
POWER
PHASE
MIN MAX
LISTED
773L
P/N WF-100i
AUDIO
EQUIPMENT
POWER
ON
OFF
1
2
5
6
7
8
4
3
230v ONLY
1. Auto Power - This Auto On/Off switch controls
whether the BU2’s Automatic turn-on circuit is
active. When this switch is ON, the BU2 will turn
itself on, indicated by a green LED, when it is
plugged in and receiving a signal. When the BU2
has not received a signal for8-10minutes, the
unit will revert to the STANDBY mode, indicated by
a red LED. When this switch is OFF, the unit
switches to the STANDBY mode and will stay OFF,
regardless of input signal. THIS IS NOT A TRUE
AC POWER SWITCH AS IT DOES NOT
DISCONNECT THE AMPLIFIER FROM THE
AC LINE.
2. Standby LED - The LED will light green when the
unit is plugged in and is receiving signal. When in
standby mode (when the Auto mode is active but
the subwoofer is receiving no signal) the LED is
red.
3. High Level Inputs - These High Level Inputs are for
receivers that do not have line-level “pre-amp out”
or “subwoofer out” jacks. When a pair of main or
satellite speakers are attached to the OUTPUT
terminals, they are driven the full range of
frequencies as generated by the music source
(receiver, amplifier, etc.)
4. Low Level Input - These left and right Line Level
Inputs are normally used when the receiver/
processor has line-level “pre-amp out ” or
“subwoofer out” jacks. If a single cable mono
or subwoofer source is connected to the BU2, a
Y-cable must be connected to the subwoofer for
full output.
5. Frequency - The Frequency adjustment determines
the upper corner roll-off point for the BU2.
6. Phase - This controls the switch from the reverse to
normal in audio signal polarity.
7. Volume Control - This controls the volume level
of the subwoofer.
8. AC Power - This switch, present on the 230v version
only, connects the AC line voltage to the BU2;
normally it is left in the ON position.
TEST PROCEDURE
Equipment needed:
n
Function/signal generator/sweep generator
n
Integrated Amplifier
n
Multimeter
n
Cables - line level (RCA) and speaker cables
General Function 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.
Turn on generator, adjust to 50mV, 50 Hz.
3.
Plug in UUT; red LED should be ON. Turn VOLUME
control full clockwise.
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 port tube opening.
Sweep Function
1.
Follow steps1-4above, 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 3.3 ohms.
3.
Connect a pair of speaker cables to driver terminals.
Cables should be connected to an integrated amplifier fed by
a signal generator. Turn on 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.
3
Powered Subwoofer BU2
BU2 TEST PROCEDURE
4
Powered Subwoofer BU2
BU2 BLOCK DIAGRAM (for 120v & 230v versions)
5
Powered Subwoofer BU2
BU2 CABINET EXPLODED VIEW
6
Powered Subwoofer BU2
AMPLIFIER EXPLODED VIEW
BU2
Amplifier
Exploded
View
E
E
D
D
C
C
B
B
A
A
7
7
6
6
5
5
4
4
3
3
2
2
1
1
2
17
1
3
4
5
6
13
15
22
13
18
19
20
14
24
23
16
16
7
8
10
11
12
21
11
11
9
2
7
Powered Subwoofer BU2
BU2 MECHANICAL PARTS LISTS
Ref.# Part # Description Qty
1 XX1342 GASKET 1 OF 4 4
2 XX1250 Strain Relief SPT-1 Black 2
3 XX1275 Plastic Cover For Inf. Bu-1(2) 1
4 NU1049 Nut 8-32 x 1/4 Hex Keps Sink F 4
(XFORMER)
5 MI1211 POWER TRANSFORMER BU-2 1
6 BR1538 FRONT PLATE BU-2 1
7 SW1082 THERMOSWITCH 60 DEG C PANEL 1
MOUNTED FASTON TERM
(FRONT PLATE)
8 HA1132 HARNESS AC CORD BU-1/BU-2 1
(FRONT PLATE)
9 XX1343 KNOB BLACK W-POSITION INDICATOR 2
(CUSTOM) (POT.)
10 HS1171 HEATSINK BU-2 (FRONT PLATE) 1
11 SC1284 Screw 4-40X 3/8 TATTITE, PAN PHIL 9
HEAD, BLACK ZINC FIN
(HEATSINK-FRONT PLATE)
12 BR1544 BRACKET FOR HEATSINK BU-2 1
13 BR1395 Bracket Pwr Support Bass550 2
14 SP1082 SPONGE W/ADHESIVE L=1/4" W=1/4" 2
T=3/16" (TO-92)
15 SP1073 Sil Pad TO-3P 1.0" x 0.750" (POWER 3
XTORS TO-218 [1X], TO-220 [2X])
16 SC1194 Screw 6-32x3/8 Tapt-Thr Hex Washr 2
(PC BOARD BRACKET)
17 HA1218 SPK HARNESS AWG 18 MOLEX TO 1
FASTON .187 AND .250
(PLASTIC COVER)
Ref.# Part # Description Qty
18 SC1215 Screw M3x1.25x10 Plas-Thr Pan-Phi 3
(SPKR CONNECTOR, RCA CONNECTOR)
19 SC1253 Screw 4-40x3/8 Pan Phillips Hd Mc 2
(THERMOSWITCH)
20 SC1214 Screw 8-32x1/2 Mach-Thr Pan-Phil 4
(XFORMER)
21 SC1285 Screw 6-32X3/4 MACH-THR 3
PAN PHI HEAD, BLACK ZINC FSH
(XTOR BAR)
22 NU1059 Nut 4-40Keps-Thr, Hexag. Znk Fs 2
(THERMOSWITCH)
23 BR1567 FIN-XTOR BAR TO-218 FOR BU2 2
24 BR1568 FIN-XTOR BAR TO 220 FOR BU2 1
SP1072 Sil Pad TO-220 0.750" x 0.500" 2
(TO-220 TRANSISTOR)
XX1370 GASKET PWR XMER 3.20" x 3.20" 1
x 1/16" (FRONT PLATE [XMER])
(NOT SHOWN)
Ref.# Part # Description Qty
Capacitors
C1, 2 CP1584 CAP A.E. 6800uF,20%,63V 2
C3, 4, 5, 11 CP1552 SMD Cap .1uF 20% 100v Z5U 1210 4
C6, 7, 15, 16, 21, CP1426 SMD CAP 0.1uF 20% 50V Z5U 18
22, 25, 38, 39, 1206 T/R
110, 111, 115,
116, 117, 126,
127, 134, 135
C8, 9 CP1475 SMD Cap 33pF 5% 50v NPO 1206 2
C10, 23, 24, 40, CP1496 SMD CAP 100pF 10% 50V X7R 1206 9
41, 102, 104,
109, 133
C12 CP1563 SMD Cap 150pF 5% 50v NPO 1206 1
C13, 31 CP1412 Cap Alum El. 47uF 20% 16v Rad. 2
C14 CP1436 SMD CAP 0.022uF 20% 50V Z5U 1
1206 PKG.
C17 CP1562 Cap Alum El. 330uF 20% 16v T/R 1
C18, 34, 35, 36, 37 CP1645 Cap Al El 22uF 20% 63V 85 Deg 5
C19 CP1177 Cap Poly Film 0.22uF 5% 63V TR 1
C20 CP1539 Cap. Poly Fil .047uF 5% 63V TR 1
C26, 27 CP1844 SMD CAP CERAMIC 0.01uF 10% 2
200V X7R 1206 T/R
C29 CP1808 Cap Poly Fil 0.01uF Class X2 1
C28, 120, 121, 122 CP1679 Cap. Poly Fil .068uF 5% 63V 4
C30 CP1479 SMD CAP 3300pF 10% 100V X7R 1
C33, 125 CP1495 Cap Poly Film 0.1uF 5% 63v T/R 2
C101, 103 CP1646 SMD Cap 220pF 5% 50V X7R 1206 2
C107, 112 CP1417 Cap Alum El. 22uF 20% 16v T/R 2
C113 CP1415 Cap Alum El. 2.2uF 20% 50v T/R 1
C114 CP1411 Cap Alum El. 100uF 20% 16v T/R 1
C118, 119 CP1409 CAP ALUM El 0.33uF 20% 50V 2
T/R LS=0.100"
C123 CP1917 CAP POLY FILM 0.12uF 5% 50V 1
LS=5mm H=16.5mm T/R
C124 CP1916 CAP POLY FILM .068uF 5% 50V 1
LS=5mm H=16.5mm T/R
C128 CP1915 CAP POLY FILM 8200pF 5% 50V 1
LS=5mm H=16.5mm T/R
C129 CP1918 CAP POLY FILM 0.27uF 5% 50V 1
LS=5mm H=16.5mm T/R
C130, 131 CP1914 CAP POLY FILM 0.039uF 5% 50V 2
LS=5mm H=16.5mm T/R
C132 CP1678 CAP POLY FILM 5600pF 5% 50V 1
LS=5mm H=16.5mm T/R
Ref.# Part # Description Qty
Diodes
D1, 2, 3, 4 DI1005 Rectifier Diode 3A/200V 1N5401 4
D5, 6, 7, 8, 9, DI1132 SMD Diode Swch LL-34 Pkg T/R 11
10, 11, 16, 17, RLS4148
101, 102
D12 DI1010 Diode Fast Rect. 1A/100v Axial IN4002 1
Z1, 2 DI1150 SMD Zener 15v 5% CP Pkg. T/R 2
Integrated Circuits
IC1, 2, 102, IC1041 IC SMD DUAL J-FET-INPUT 5
103, 104 OP AMP T/R TLO72
IC101 IC1162 IC SMD Quad-J Fet Input OP Amp 1
TLO74
Transistors
Q1 TR1245 TIP35E TO-3P 1
Q2 TR1246 TIP36E TO-3P 1
Q3 TR1247 TIP32E TO-220 1
Q4 TR1248 TIP31E TO-220 1
Q5 TR1043 MPS2222A TO-92 Bulk 1
Q6, 9, 15, 20 TR1166 2N5401 TO-92 T/R 4
Q7, 8 TR1167 2N5551 TO-92 T/R 2
Q10, 12, 14 TR1131 DTC114TK 3
Q11 TR1108 2SC2412K 1
Q13 TR1125 2SA1037K 1
Q16 TR1184 TIP32C 1
Q17 TR1183 TIP31C 1
Resistors
J1, 2, 3, 4, 5, 6, RS1779 SMD RES ZERO ohm 5% 1/8W 1206 27
7, 8, 9, 10, 11,
12, 13, 14, 101,
102, 103, 104,
105, 106, 107,
108, 109, 110,
111, 112, 113
R1, 2, 43 RS1868 RES CER 0.1 ohm 5% 5W 3
RADIAL BULK
R3, 4 RS1916 RES C/F 5.1 ohm 5% 1/4W T/R 2
R5 RS1994 RES C/F 100 ohms 5% 1/4W T/R 1
R6, 20, 21, 34, 111 RS1831 SMD RES 7.5Kohm 5% 1/8W 1206 5
R7 RS1871 SMD RES 5.1Kohm 5% 1/8W 1206 1
R8 RS1878 SMD RES 10 ohm 5% 1/8W 1206 1
8
Powered Subwoofer BU2
BU2 ELECTRICAL PARTS LISTS
Ref.# Part # Description Qty
R9, 10, 35, 44, RS1701 SMD RES 10Kohm 5% 1/8W 1206 13
46, 52, 59, 67,
113, 121, 123,
127, 130
R11, 12, 15, 17 RS1717 SMD RES 100 ohm 5% 1/8W 1206 4
R13, 14, 40, 57 RS1722 SMD RES 470 ohm 5% 1/8W 1206 4
R16, 23, 26, 50, 61 RS1706 SMD RES 47Kohm 5% 1/8W 1206 5
R18, 24, 119 RS1703 SMD RES 2.2Kohm 5% 1/8W 1206 3
R19, 22 RS1725 SMD RES 15Kohm 5% 1/8W 1206 2
R25, 125 RS1883 SMD RES 1.5Kohm 5% 1/8W 1206 2
R27, 28, 29, RS1898 SMD RES 10Kohm 1% 1/8W 1206 5
49, 56
R30 RS2160 SMD RES 11Kohm 1% 1/8W 1206 1
R31 RS2468 SMD RES 1Mohm 1% 1/8W 1206 1
R32, 54, 55 RS2448 SMD RES 47.5Kohms 1% 1/8W 1206 3
R33 RS1877 SMD RES 4.3Kohm 5% 1/8W 1206 1
R36, 37 RS2180 RES M/O F/P 470 ohm 5% 1W T/R 2
R38, 39, 53, 58 RS1705 SMD RES 4.7Kohm 5% 1/8W 1206 4
R41, 42 RS1715 SMD RES 5.6Kohm 5% 1/8W 1206 2
R45, 126, 128, RS1704 SMD RES 22Kohm 5% 1/8W 1206 4
129
R47 RS1700 SMD RES 1Kohm 5% 1/8W 1206 1
R48 RS1782 SMD RES 1.8Kohm 5% 1/8W 1206 1
R51 RS2422 RES M/O F/P 100 ohm 5% 1W T/R 1
R60, 102, 103, RS1702 SMD RES 100Kohm 5% 1/8W 1206 7
104, 105, 116,
122
R62 RS2449 SMD RES 182Kohms 1% 1/8W 1206 1
R63 RS1943 SMD RES 22.1Kohm 1% 1/8W 1206 1
R64 RS1957 SMD RES 4.99Kohm 1% 1/8W 1206 1
R65 RS2446 SMD RES 1.18Kohms 1% 1/8W 1206 1
R66 RS2450 SMD RES 2.21Kohm 1% 1/8W 1206 1
R68 RS1958 SMD RES 18.7Kohms 1% 1/8W 1206 1
R69 RS2447 SMD RES 3.65Kohms 1% 1/8W 1206 1
R101, 108 RS1998 RES C/F 4.7ohm 5% 1/4W T/R 1
R109, 110 RS1790 SMD RES 2.7Kohm 5% 1/8W 1206 2
R112, 115 RS1713 SMD RES 56Kohm 5% 1/8W 1206 2
R114 RS1793 SMD RES 470Kohm 5% 1/8W 1206 1
R117 RS1968 SMD RES 2.2Mohm 5% 1/8W 1206 1
R118 RS1710 SMD RES 3.3Kohm 5% 1/8W 1206 1
R120 RS1892 SMD RES 10Mohm 5% 1/8W 1206 1
Ref.# Part # Description Qty
R124 RS1767 SMD RES 1Mohm 5% 1/8W 1206 1
R131 RS1992 SMD RES 390Kohm 5% 1/8W 1206 1
R132, 133, 134, RS1724 SMD RES 6.8Kohm 5% 1/8W 1206 4
135
R136, 137 RS2479 SMD RES 14Kohm 1% 1/8W 1206 T/R 1
Miscellaneous
AC1, 2, CT, TE1185 Terminal male type 4
TI(AC-H1) quick-fit 0.187 TAB
CONN101 HA1186 HARNESS 7-POSITION 0.1" 1
CENTER-CENTER L=4"
CONN102 CO1334 JACK SPEAKER OCTAL PC MOUNT 1
RIGHT ANGLE
F1 FS1067 Fuse Slo-Blo 2A/250v 5x20 120v GMC 1
Fuse Slo-Blo 1.6A/250v 5x20 230v GMC 1
F1 (CLIP) XX1297 Fuse Clip 5x20 PC Mount 2
K1 RE1019 Relay,12A,48VDC 1
L1 MI1100 Inductor Air Core 0.38uH 1
LED101 LE1032 Led Bicolor Red/Green 5mm 1
TH1 TH1006 NTC THERMISTOR 10Kohm @ 25DegC 1
RCA101 CO1407 CONNECTOR RCA DUAL VERT. 1
PC MOUNT WHT/RED R/A GOLD
SPKOUT CO1343 Strght Sq Hdr 0.156"Center 1
SW1 507-8046 AC Power Switch 230v version only 1
SW101, 102 SW1084 Auto On, Phase, slide switch DPDT 2
T1 MI1211 Power Transformer 120v BU2 1
MI1216 Power Transformer 230v BU2 1
T2(XFORMER), TE1175 Trmnl Male Tab .032"x.250"PC M 2
T3(AC LO)
T4 HA1175 HARNESS, POCKET TERMINAL 1
TO FASTON .250, 5",#18 GRE
TP1, 2 TE1213 TERMINAL TURRET 2
VR101 RS2426 POT 20K DUAL 16mm B-TAPER 1
SHAFT “F” PC MOUNT R/A
VOLUME
VR102 RS2427 POT 20K QUAD 16mm B-TAPER 1
SHAFT “F” PC MOUNT R/A
FREQUENCY
9
Powered Subwoofer BU2
10
Powered Subwoofer BU2
BU2 PACKAGING EXPLODED VIEW
11
Powered Subwoofer BU2
INTEGRATED CIRCUIT DIAGRAMS
12
Powered Subwoofer BU2
PRINTED CIRCUIT BOARDS (TOP VIEW, component side)
13
Powered Subwoofer BU2
PRINTED CIRCUIT BOARDS (BOTTOM VIEW, solder side)
14
Powered Subwoofer BU2
PREAMP/CROSSOVER SCHEMATIC 120V VERSION
15
Powered Subwoofer BU2
POWER SCHEMATIC 120V VERSION
18.7K 1%
R68
3.65K 1%
R69
20K 1%
P1
F1
2A
55@C
THERMSW1
470
R14
47uF/16V
C13
2.2K
R24
C41
100pF
C30
3300pF
R50
47K
C40
100pF
47.5K 1%
R32
C38
0.1uF
C39
0.1uF
IC2:B
-
6
+
5
7
RLS4148
D5
R31
1M 1%
470
R40
D10
RLS4148
C33
0.1uF
0.22uF
C19
2.21K 1%
R66
R65
1.18K 1%
R62
182K 1%
C20
.047uF
R49
10K 1%
IC2:A
-
2
+
3
8
4
47.5K 1%
R54
R56
10K 1%
C35
22uF/63V
Q10
DTC114TK
RLS4148
D6
R25
1.5K
R26
47K
.022uF
C14
1.8K
R48
C31
47uF/16V
-
2
+
3
10K 1%
R28
10K 1%
R27
11K 1%
R30
D16
RLS4148
K1
RELAY
10K
R44
2SA1037K
Q13
R59
10K
Q14
DTC114TK
0.38uH
L1
10
R8
D9
RLS4148
R46
10K
100-1W
R51
2N5401
Q20
4.7K
R53
10K
R52
D12
IN4002
47K
R61
100K
R60
C17
330uF/16V
4.7K
R58
R39
8.2K
0.1uF
C22
R38
4.7K
0.1uF
C25
0.1uF
C16
TIP36E
Q2
.1/5W
R2
.1/5W
R1
Q1
TIP35E
R4
5.1
R3
5.1
2N5401
Q15
C11
0.1uF/100V
Q17
TIP31C
DZD15-TB
Z1
C37
22uF/63V
0.1uF
C15
R41
5.6K
C36
22uF/63V
R36
470-1W
C24
100pF
C23
100pF
MPS2222A
Q5
R7
5.1K
R6
7.5K
100
R11
2N5401
Q6
100
R12
Q7
2N5551
15K
R19
7.5K
R20
7.5K
R21
100
R15
100
R17
470
R13
C8
33pF
33pF
C9
2N5401
Q9
R16
47K
2.2K
R18
100pF
C10
Q8
2N5551
C7
0.1uF
R9
10K
R10
10K
Q3
TIP31E
TIP32E
Q4
R5
100
C6
0.1uF
15K
R22
C5
0.1uF/100V
C3
0.1uF
C4
0.1uF
C2
6800uF/63V
C1
6800uF/63V
1N5401
D4
1N5401
D3
1N5401
D2
1N5401
D1
TI
Q12
DTC114TK
Q11
2SC2412K
D7
RLS4148
D8
RLS4148
10K
R35
R33
4.3K
R34
7.5K
C29
0.01uF/1KV
IC1:B
+
5
0.01uF/200V
C26
0.01uF/200V
C27
R23
47K
150PF
C12
Z2
DZD15-TB
5.6K
R42
TIP32C
Q16
0.1uF
C21
C34
22uF/63V
R37
470-1W
R43
0.1/5W 1%
C18
22uF/63V
R29
10K 1%
TH1
10K&25degC
RLS4148
D17
R57
470
D11
RLS4148
22K
R45
1K
R47
R67
10K
R63
22.1K 1%
R64
4.99K 1%
20K 1%
P2
R55
47.5K 1%
.068uF
C28
MI1211
BLACK/WHITE OR RIBS
SOLID BLACK
120V/60HZ
MATES WITH PCB CL1233
BU-2 POWER BOARD (120V VERSION)
LO
HI
L
N
IN
SERVO LEVEL
IC1:A
TL072
TL072
TL072
INPUT
FROM SHEET 1
TO SHEET 1
PROTECTION
+
-
SPKROUT
-
TO SHEET 1
FROM SHEET 1
MUTE
IN
TL072
AC1
CT
AC2
TO SHEET 1
AGND
1K@85C
TO SHEET 1
AGC OUT
AGND
TO SHEET 1
N/C
SERVO GAIN
*
*
*
*
1
6
7
1
TP1
TP2
1
1
2
8
4
5
4
6
6
7
2
5
5
4
4
3
3
2
2
1
1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
4 OHMS LOAD
WITHOUT LOAD
NOTES:
*
P1: REPLACED WITH FIXED
RESISTORS, R68,R69 ONLY.
P2: REPLACED WITH FIXED
RESISTORS, R64,R65 ONLY.
0.267V
0.485V
-15V
-V
0.273V
1.2mV
-V
+V
+15V
-15V
3.8mV
32.5mV
-15V
-15V
+15V
+15V
-15V
+15V
-V
+V
10.01V
5.915V
16
Powered Subwoofer BU2
PREAMP/CROSSOVER SCHEMATIC 230V VERSION
17
Powered Subwoofer BU2
POWER SCHEMATIC 230V VERSION
5
5
4
4
3
3
2
2
1
1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
C28
.068uF
47.5K 1%
R55
P2
20K 1%
4.99K 1%
R64
22.1K 1%
R63
10K
R67
R47
1K
R45
22K
RLS4148
D11
470
R57
D17
RLS4148
10K&25degC
TH1
10K 1%
R29
22uF/63V
C18
0.1/5W 1%
R43
470-1W
R37
22uF/63V
C34
C21
0.1uF
Q16
TIP32C
R42
5.6K
DZD15-TB
Z2
C12
150PF
47K
R23
C27
0.01uF/200V
C26
0.01uF/200V
IC1:B
+
5
0.01uF/1KV
C29
7.5K
R34
4.3K
R33
R35
10K
RLS4148
D8
RLS4148
D7
2SC2412K
Q11
DTC114TK
Q12
TI D1
1N5401
D2
1N5401
D3
1N5401
D4
1N5401
6800uF/63V
C1
6800uF/63V
C2
0.1uF
C4
0.1uF
C3
0.1uF/100V
C5
R22
15K
0.1uF
C6
100
R5
Q4
TIP32E
TIP31E
Q3
10K
R10
10K
R9
0.1uF
C7
2N5551
Q8
C10
100pF
R18
2.2K
47K
R16
Q9
2N5401
C9
33pF
33pF
C8
R13
470
R17
100
R15
100
R21
7.5K
R20
7.5K
R19
15K
2N5551
Q7
R12
100
Q6
2N5401
R11
100
7.5K
R6
5.1K
R7
Q5
MPS2222A
100pF
C23
100pF
C24
470-1W
R36
22uF/63V
C36
5.6K
R41
C15
0.1uF
22uF/63V
C37
Z1
DZD15-TB
TIP31C
Q17
0.1uF/100V
C11
Q15
2N5401
5.1
R3
5.1
R4
TIP35E
Q1
R1
.1/5W
R2
.1/5W
Q2
TIP36E
C16
0.1uF
C25
0.1uF
4.7K
R38
C22
0.1uF
8.2K
R39
R58
4.7K
330uF/16V
C17
R60
100K
R61
47K
IN4002
D12
R52
10K
R53
4.7K
Q20
2N5401
R51
100-1W
10K
R46
RLS4148
D9
R8
10
L1
5.8uH
DTC114TK
Q14
10K
R59
Q13
2SA1037K
R44
10K
RELAY
K1
RLS4148
D16
R30
11.5K 1%
R27
10K 1%
R28
10K 1%
+
3
-
2
47uF/16V
C31
R48
1.8K
C14
.022uF
47K
R26
1.5K
R25
D6
RLS4148
DTC114TK
Q10
22uF/63V
C35
10K 1%
R56
R54
47.5K 1%
IC2:A
4
8
+
3
-
2
10K 1%
R49
.047uF
C20
182K 1%
R62
1.18K 1%
R65
R66
2.21K 1%
C19
0.22uF
0.1uF
C33
RLS4148
D10
R40
470
1M 1%
R31
D5
RLS4148
IC2:B
7
+
5
-
6
0.1uF
C39
0.1uF
C38
R32
47.5K 1%
100pF
C40
47K
R50
3300pF
C30
100pF
C41
R24
2.2K
C13
47uF/16V
R14
470
SW1
1.6A
F1
.
.
.
.
.
P1
20K 1%
R69
3.65K 1%
R68
18.7K 1%
6800pF
C32
*
*
BU-2 POWER BOARD (230V VERSION)
SERVO GAIN
N/C
TO SHEET 1
AGND
AGC OUT
TO SHEET 1
1K@85C
AGND
TO SHEET 1
AC2
CT
AC1
TL072
IN
MUTE
FROM SHEET 1
TO SHEET 1
-
SPKROUT
-
+
PROTECTION
TO SHEET 1
FROM SHEET 1
INPUT
TL072
TL072
TL072
IC1:A
SERVO LEVEL
IN
N
L
HI
LO
MI1216
CRITICAL SAFETY COMPONENT
REPLACE ONLY WITH SAME TYPE COMPONENT
230V/50HZ
2
7
3
6
4
5
4
8
2
1
1
TP2
TP1
1
7
6
1
THESE VALUE REPLACE P1,P2.
NOTES:
*
4 OHMS LOAD
WITHOUT LOAD
-V
-15V
+V
-V
-15V
+15V
0.485V
0.267V
1.2mV
0.273V
3.8mV
32.5mV
-15V
+15V
-15V
+15V
-15V
+V
-V
10.01V
5.915V
+15V
/
