BOSE COMPANION 3 Schematic
Companion® 3 Multimedia
Speaker System
Product Description
The Companion 3 multimedia speaker system is a stereo system designed to be used as a computer sound
system. It can be used with any analog audio source. It has a bass module with a 6.5 inch dual voice coil
woofer in a slot ported design. The two satellite speakers connect to the bass module and are easily mounted
to a monitor with brackets, or can be placed on a desk or other desired surface. A wired remote control pod is
used to control volume and mute/un-mute functions. It also has a second input and a stereo headphone output.
Manufacturing Information - Early Version / Later Version
There are two different versions of the Companion 3 - Early Version / Later Version. From the outside there is
basically no difference but the boards inside are different. Please note the differences are documented in the
Electronic Part list. If a part numbers has changed from the early version or a part number has been added to
the later version a number 4 will be shown in Notes column. The product codes can be used to determined the
version. The product code for the early version is 033935 and the product code for the later version is 033061.
These product codes are the first six digits of the serial number and are located on the bottom of the system.
The serial number should be used to determined where the system was manufactured before attempting a
repair.
©2007 Bose Corporation
Reference Number 271885-SM Rev. 11
Service Manual
Electronic copy only
Contents
Safety Information .............................................................................................................................3
Electrostatic Discharge Sensitive (ESDS) Device Handling ....................................................... 3
Specifications....................................................................................................................................4
Part List Notes ..................................................................................................................................5
Figure 1. Bass Module Assembly Exploded View ................................................................................6
Bass Module Assembly Parts List ...................................................................................................6
Figure 2. Amplifier Module Assembly Exploded View ...........................................................................7
Amplifier Module Assembly Parts list..............................................................................................7
Figure 3. Packing Exploded Veiw ........................................................................................................ 8
Packing Parts List .............................................................................................................................8
Electrical Parts List .................................................................................................................... 9-19
Main PCB Assembly Parts List................................................................................................... 9-17
Power Supply PCB Assembly Parts List ................................................................................. 17-19
Disassembly Procedures ......................................................................................................... 20-22
Test Procedures ....................................................................................................................... 23-25
Theory of Operation ................................................................................................................. 26-28
Revision History .............................................................................................................................29
Theory of Operation ................................................................................................................. 26-28
Warranty
The Bose® Companion® 3 MultiMedia Speaker System is covered by a 1-year, transferable limited
warranty.
Proprietary Information
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE
CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF
SERVICING THE IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE
SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT
BE REPRODUCED OR USED FOR ANY OTHER PURPOSE.
Caution: The Companion 3 MultiMedia Speaker System contains no user serviceable parts.
To prevent warranty infractions, refer servicing to warranty service centers or factory service.
2
Safety Information
1. Parts that have special safety characteristics are identified by the symbol on the schematics
or by special notes on the parts list. Use only replacement parts that have critical characteristics
recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed parts are acceptably
insulated from the supply circuit before returning the unit to the customer. Use the following checks to
perform these measurements:
A. Leakage Current Hot Check- With the unit completely reassembled, plug the AC line cord directly
into a 120V AC outlet. (Do not use an isolation transformer during this test). Use a leakage current
tester or a metering system that complies with the American National Standards Institute (ANSI)
C101.1 “Leakage Current for Appliances” and the Underwriters Laboratories (UL) 6500/IEC 60056
paragraph 9.1.1. With the unit AC switch first in the ON position and then in the OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the unit
(antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.) especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured
must not exceed 0.5 milliamp. Reverse the unit power cord plug in the AC outlet and repeat the test.
ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.
B. Insulation Resistance Test Cold Check- (1) Unplug the power supply and connect a jumper wire
between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on
the unit. When testing 3 wire products, the resistance measured to the product enclosure should be
between 2 and infinite MOhms. Also, the resistance measured to exposed input/output connectors
should be between 4 and infinite MOhms. When testing 2 wire products, the resistance measured to
exposed input/output connectors should be between 4 and infinite MOhms. If it is not within the limits
specified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked
before it is returned to the customer.
Electrostatic Discharge Sensitive (ESDS)
Device Handling
This unit contains ESDS devices. We recommend the following precautions when repairing, replacing
or transporting ESDS devices:
•Perform work at an electrically grounded work station.
•Wear wrist straps that connect to the station or heel straps that connect to conductive floor mats.
•Avoid touching the leads or contacts of ESDS devices or PC boards even if properly grounded.
Handle boards by the edges only.
•Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected
devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap or plastic
trays.
3
Specifications
Mechanical
Dimensions: Bass Module: 8 5/8 “H x 7 1/8” W x 14” D
(21.8 x 18 x 35.56 cm)
Satellite Speaker: 3 1/2” H x 2 1/2” W x 2 3/8” D
(8.89 x 6.35 x 6.10 cm)
Control Pod: 2 1/2 “D x 1 1/8” H
(6.35 x 2.79 cm)
Weight: Bass Module: 15.4 lbs (6.98 kg) unpacked
Satellite Speaker: 0.5 lbs (0.23 kg) each
Packaged System 19.95 lbs (9.06 kg) packed
Finish: Bass Module: Scratch-resistant, satin-finish
vinyl
Satellites: Painted polymer finish
Bass Box: Slot ported
Bass Box Port Tuning: 45 Hz
Electrical
Power Rating: USA/Canada: 115 VAC 50/60 Hz
Japan 100 VAC 50/60 Hz
Euro 230 VAC 50/60 Hz
Nominal System
Bandwidth:
Maximum SPL: 100 dB (A weighted) pink
Output: Bass: 60 Watts
Satellites: 18 Watts per channel
40 Hz to 15 kHz
noise signal
4
Part List Notes
1. This part is not normally available from Customer Service. Approval from the Field Service Manager
is required before ordering.
2. The individual parts on the PCBs are listed in the Electrical Part list.
3. This part is critical for safety purposes. Failure to use a substitute replacement with the same
safety characteristics as the recommended replacement part might create shock, fire and/or other
hazards.
4. The part number listed was included in the latest version of the Companion 3. The Main board and
the Power board for the latest version can be identified by the part number stamped on the component side of the board.
Power Board - 285350-001
Main Board - 280066-001
5. The part number listed is an assembly part number. The individual parts of the assembly might not
be available separately.
6. This part is referenced for informational purposes only. It is not stocked as a repair part. Refer to
the next higher assembly for a replacement part.
5
Item Description Part Number Qty. Note
1 BASS MODULE ASSY, US/CANADA, 120V
BASS MODULE ASSY, JAPAN, 100V
BASS MODULE ASSY, EURO, 230V
(Complete package, includes Amp Mod Assy.)
2 CLEAT, ABS 271817-001 1
3 SCREW, 4 x 1, THDF, FLHD, 82 DEG, PH 274151-16 3
4 CLIP, SPRING, KNOB 262542 1
5 KNOB, VOL CNTL, BLK 271860-001 1
6 LABEL, I/O, US/CANADA, 120V
LABEL, I/O, JAPAN, 100V
LABEL, I/O, EURO, 230V
7 SCREW, TF, 4 x 3/4, PAN, PH, BLK 273556-12 5
8 MOD ASSY, AMP, 120V
MOD ASSY, AMP, 220V, EURO
MOD ASSY, AMP, 100V JAPAN
*282451-001
*282451-002
*282451-003
272079-001
272079-002
272079-003
*307876-011
*307876-033
*307876-022
1
1
1
1
1
1
1
5
5
5
3
3,4
3,4
- XFORMER, TORROID, 105W, 15VDC, 7A
TRANSFORMER, TOROID, 100V, 60Hz
TRANSFORMER, TOROID, 230V, 50Hz
*Capacitor C7 on the new power supply board may need to be replaced, see Service Bulletin 271885-B4
X3
3
271818-001
N/A
277613-001
4
1
5
2
1
6
X5
7
Figure 1. Bass Module Assembly Exploded View
6
8
23
1
4
5
6
7
8
Figure 2. Amplifier Module Assembly
Item Description Part Number Qty. Note
1 PCB ASSY, MAIN 280109-01 1 6
2 BRACKET, METAL, IC 271859 1 6
3 HEATSINK, EXTRUDED, COMP 3 271856 1 6
4 CLIP, THERMAL, THERMISTOR 272964-001 1 6
5 HEAT SPREADER, ALUM 279844-001 1 6
6 SCREW, TAPP, 6-13x.625, PAN, XRC/S 172783-10 4
7 CONN, SWITCH, POWER, 3P 273115-001 1 6
8 PCB ASSY, PS, 120V, US
PCB ASSY, PS, 100V, JAPAN
PCB ASSY, PS, 240V, EURO
*Capacitor C7 on the new power supply board may need to be replaced, see Service Bulletin 271885-B4
307872-011
307872-022
307872-033
1
1
1
4
4
4
7
X2
16
4
17
1
2
3
6
5
10
15
78
11 12
X2
9
13 14
Figure 3. Packaging Exploded View
Item
Number
1 OWNER’S GUIDE US/CANADA
OW NER ’ S GUI DE 5 LA NG
2 BA G , PO LY, 14.38 x 9.87 x 2 mi l 1 03 351 1
3 PACKING TUBE, 4.75 x 2.75 x 7.69 273522 1
4 BASS MOD ULE ASSY, US/CANADA, 120V
BASS MODULE ASSY, EUR O, 230V
BASS MODULE ASSY, JAPAN , 100V
(Compl ete package, i ncl u des Amp M od
Assy.)
5 CONTROL POD (NON-REPAIRABLE) 307874-001 1 5
6 LINE CORD, 100 V, BLK, JAPAN
LINE C ORD, 120V, BLK, US/CANADA
LINE C ORD, 220V, BLK, EURO
LINE CORD , 23 0V, BLK, UK
LINE C ORD, 240V, BLK, AUS
7 BRACKET, SAT, LEFT 271880-001 1
8 BRACKET, SAT, RGHT 271881-001 1
9 CABLE, INPUT, 3.5MM, 6FT, BLK 2719 94-001 1
10 SCREW, MACH , M 4 x 0.5, PAN 272963-08 2
11 BA G , PO LY, 14.38 x 9.87 x 2 mi l 1 03 351 1
12 FASTENER, RD, CLR, 21MM OD, PSA 273164 2
13 FEET, CLEAR, SATELLITE 178321-04 16
14 FEET, RUBBER, BRACKET 260465 4
15 SAT ASSY, BLACK/GRAY 271827-019 2
16 CARTON, RSC, P RINTED 272410 1
17 PACKING, EPS, FILLERS 272409 2
Description Part
Number
271883-001
272956
282451-001
282451-002
282451-003
264514-001
262814-001
148203
134725
284243-001
Qty. Notes
1
1
1
1
1
1
1
1
1
1
5
4,5
4,5
3
8
ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors
Reference
Designator
R1 1.00K, 0805, 1/10W, 1% 133625-1001
R4 1.00K, 0805, 1/10W, 1% 133625-1001
R2 1.00K, 0805, 1/10W, 1% 133625-1001
R3 1.00K, 0805, 1/10W, 1% 133625-1001
R5 2.00K, 0805, 1/10W, 1% 133625-2001
R6 JUMPER, CHIP, 0805 133627
R101 1.21K, 0805, 1/10W, 1% 133625-1211
R102 1.30K, 0805, 1/10W, 1% 133625-1301
R103 9.53K, 0805, 1/10W, 1% 133625-9531
R104 10.0K, 0805, 1/10W, 1% 133625-1002
R105 127K 0805, 1/10W, 1% 133625-1273
R106 127K 0805, 1/10W, 1% 133625-1273
R107 10.0K, 0805, 1/10W, 1% 133625-1002
R108 10.0K, 0805, 1/10W, 1% 133625-1002
R109 2.00K, 0805, 1/10W, 1% 133625-2001
R110 10.0K, 0805, 1/10W, 1% 133625-1002
R111 10.0K, 0805, 1/10W, 1% 133625-1002
R125 2.55K, 0805, 1/10W, 1% 133625-2551
R126 200K, 0805, 1/10W, 1% 133625-2003
R127 47.5K, 0805, 1/10W, 1% 133625-4752
R128 1.10K, 0805, 1/10W, 1% 133625-1101
R129 21.5K, 0805, 1/10W, 1% 133625-2152
R130 330 OHM, 0805, 1/10W, 1% 133625-3300
R131 6.81K, 0805, 1/10W, 1% 133625-6811
R132 17.4K, 0805, 1/10W, 1% 133625-1742
R133 1.62K, 0805, 1/10W, 1% 133625-1621
R134 2.00K, 0805, 1/10W, 1% 133625-2001
R135 1.00K, 0805, 1/10W, 1% 133625-1001
R136 1.82K, 0805, 1/10W, 1% 133625-1821
R137 10.0K, 0805, 1/10W, 1% 133625-1002
R138 2.00K, 0805, 1/10W, 1% 133625-2001
R139 1.50K, 0805, 1/10W, 1% 133625-1501
R140 1.50K, 0805, 1/10W, 1% 133625-1501
R201 1.21K, 0805, 1/10W, 1% 133625-1211
R202 1.30K, 0805, 1/10W, 1% 133625-1301
R203 9.53K, 0805, 1/10W, 1% 133625-9531
R204 127K 0805, 1/10W, 1% 133625-1273
R205 10.0K, 0805, 1/10W, 1% 133625-1002
R206 127K 0805, 1/10W, 1% 133625-1273
R207 10.0K, 0805, 1/10W, 1% 133625-1002
R208 10.0K, 0805, 1/10W, 1% 133625-1002
R209 10.0K, 0805, 1/10W, 1% 133625-1002
R210 10.0K, 0805, 1/10W, 1% 133625-1002
R211 2.00K, 0805, 1/10W, 1% 133625-2001
Description Part Number Note
9
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