Bose Companion 3 Series II User manual

Companion®3 Series II Multimedia
Speaker System
©2007 Bose Corporation Service Manual
Reference Number 297700-SM Rev. 05
Electronic copy only
The Companion 3 series II 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 mounted
to speaker stands. The speakers can be placed on a desk or other surface when removed from the stands. A
wired remote control pod is used to control volume and mute/un-mute functions. The system also has a
second input and a stereo headphone output on the control pod.
Product Description

2
Warranty
The Bose®Companion®3 series II MultiMedia Speaker System is covered by a 1-year, transferable
limited warranty.
Caution: The Companion 3 series II MultiMedia Speaker System contains no user serviceable parts.
To prevent warranty infractions, refer servicing to warranty service centers or factory service.
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.
Contents
Safety Information ............................................................................................................................. 3
Electrostatic Discharge Sensitive (ESDS) Device Handling .......................................................3
Specifications....................................................................................................................................4
Part List Notes ..................................................................................................................................5
Figure 1. Bass Module Assembly Exploded View ..............................................................................56
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 ................................................................................. 18-19
Disassembly Procedures ......................................................................................................... 20-22
Test Procedures ....................................................................................................................... 23-25
Theory of Operation ................................................................................................................. 26-28
Revision History .............................................................................................................................29

3
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, mea-
sure 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.) espe-
cially 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 CUS-
TOMER.
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 resis-
tance 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.

4
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:
(no stand)
2 1/2” H x 2 3/4” W x 2 3/8” D
(6.14 x 6.86 x 6.03 cm)
Control Pod: 2 1/2 “ D x 1 1/8” H
(6.35 x 2.79 cm)
Weight: Bass Module: 14.65 lbs (6.64 kg) unpacked
Satellite Speaker: .75 lbs (0.34 kg) each
Packaged System: 20.15 lbs (9.13 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:
40 Hz to 15 kHz
Maximum SPL: 100 dB (A weighted) pink
noise signal
Output: Bass: 60 Watts
Satellites: 18 Watts per channel

5
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 is an assembly part number. The individual parts of the assembly might not
be available separately.
5. 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.

6
Figure 1. Bass Module Assembly Exploded View
1
2
3
4
8
6
5
7
X3
X5
Bass Module Assembly Exploded View
*Capacitor C7 on the new power suppl
y
board ma
y
need to be replaced, see Service Bulletin 271885-B4
Item Description Part Number Qty. Note
1 BASS MODULE, ASSY, US/CANADA, 120V (Electrofoil Logo)
BASS MODULE, ASSY, EURO, 230V (Electrofoil Logo)
BASS MODULE, ASSY, JAPAN, 100V (Electrofoil Logo)
BASS MODULE, ASSY, US/CANADA, 120V (Padprint Logo)
BASS MODULE, ASSY, EURO, 230V (Padprint Logo)
BASS MODULE, ASSY, JAPAN, 100V (Padprint Logo)
(Complete bass module package, includes Amp Mod Assy)
*300905-001
*300905-003
*300905-002
*303939-112
*303939-122
*303939-132
1
1
1
2 CLEAT, ABS 271817-001 1 5
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
300954-001
300954-002
300954-003
1
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
*307876-011
*307876-033
*307876-022
1
1
1
3
- XFORMER, TORROID, 105W, 15VDC, 7A
TRANSFORMER, TOROID, 100V, 60Hz
TRANSFORMER, TOROID, 230V, 50Hz
271818-001
N/A
277613-001

7
Item Description Part Number Qty. Note
1 PCB ASSY, MAIN 277574-001 1 5
2 BRACKET, METAL, IC 271859 1 5
3 HEATSINK, EXTRUDED, COMP 3 271856 1 5
4 CLIP, THERMAL, THERMISTOR 272964-001 1 5
5 HEAT SPREADER, ALUM 279844-001 1 5
6 SCREW, TAPP, 6-13x.625, PAN, XRC/S 172783-10 4
7 CONN, SWITCH, POWER, 3P 273115-001 1 5
8 PCB ASSY, PS, 120V, US
PCB ASSY, PS, 100V, JAPAN
PCB ASSY, PS, 220V, EURO
*307872-011
*307872-022
*307872-033
1
1
1
4
4
4
*Capacitor C7 on the new power supply board may need to be replaced, see Service Bulletin 271885-B4
Figure 2. Amplifier Module Assembly
1
23
4
5
6
8
7
Amplifier Module Assembly

8
1
3
6
7
8
9
10
4
2
5
3
Figure 3. Packaging Exploded View
*Capacitor C7 on the newpower supply board may need to be replaced, see Service Bulletin 271885-B4
Item
Number Description Part Number Qty. Notes
1 FEET, CLEAR SATELLITE 178321-04 2
2 FEET, RUBBER, BRACKET 260465 1
3 PACKING EPS,FILLER (includes both top and bottomfiller) 300908-001 1
4 CONTROL POD,
(
NON-REPAIRABLE
)
307874-002 1
5 CABLE, INPUT, 3.5MM,6FT, BLK 271994-001 1
6 LINE CORD,100V, BLK,JAPAN
LINE CORD, 120V, BLK,US/CANADA
LINE CORD, 220V, BLK,EURO
LINE CORD, 230V, BLK,UK
LINE CORD, 240V, BLK,AUS
264514-001
262814-001
148203
134725
284243-001
1 3
7 BASS MODULE, ASSY, US/CANADA, 120V (Electrofoil Logo)
BASS MODULE, ASSY, EURO, 230V (ElectrofoilLogo)
BASS MODULE, ASSY, JAPAN, 100V (Electrofoil Logo)
BASS MODULE, ASSY, US/CANADA, 120V (Padprint Logo)
BASS MODULE, ASSY, EURO, 230V (Padprint Logo)
BASS MODULE, ASSY, JAPAN, 100V (Padprint Logo)
(
Com
p
lete bass module
p
acka
g
e, includes Am
p
Mod Ass
y)
*300905-001
*300905-003
*300905-002
*303939-112
*303939-122
*303939-132
1
8 SAT, ASSY (Electrofoil Logo)
SAT, ASSY (Padprint Logo)
(
sin
g
le arra
y
, includes s
p
eaker stand
)
300766-001
303938-002 2
9 OWNERS GUIDE,3 LANG, US/CANADA
OWNERS GUIDE, 5 LANG, EURO
OWNERS GUIDE, 5 LANG, AP
296583
296584
299450
1
10 CARTON, RSC, PRINTED 300911-001 1
- CARTON KIT 300911-001K 1
Packaging Part List

9
Reference
Designator
Description Part Number Note
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
R225 100K, 0805, 1/10W, 1% 133625-1003
R226 100K, 0805, 1/10W, 1% 133625-1003
R227 JUMPER, CHIP, 0805 133627
R229 2.55K, 0805, 1/10W, 1% 133625-2551
R230 200K, 0805, 1/10W, 1% 133625-2003
R231 47.5K, 0805, 1/10W, 1% 133625-4752
R232 1.10K, 0805, 1/10W, 1% 133625-1101
ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors

10
Reference
Designator
Description Part Number Note
R233 21.5K, 0805, 1/10W, 1% 133625-2152
R234 330 OHM, 0805, 1/10W, 1% 133625-3300
R235 6.81K, 0805, 1/10W, 1% 133625-6811
R236 17.4K, 0805, 1/10W, 1% 133625-1742
R237 1.62K, 0805, 1/10W, 1% 133625-1621
R238 2.00K, 0805, 1/10W, 1% 133625-2001
R239 1.00K, 0805, 1/10W, 1% 133625-1001
R240 1.82K, 0805, 1/10W, 1% 133625-1821
R241 10.0K, 0805, 1/10W, 1% 133625-1002
R242 2.00K, 0805, 1/10W, 1% 133625-2001
R243 1.50K, 0805, 1/10W, 1% 133625-1501
R244 1.50K, 0805, 1/10W, 1% 133625-1501
R301 100 OHM, 0805, 1/10W, 1% 133625-1000
R302 100 OHM, 0805, 1/10W, 1% 133625-1000
R305 10.0K, 0805, 1/10W, 1% 133625-1002
R306 10.0K, 0805, 1/10W, 1% 133625-1002
R307 1.2 OHMS, 2512, 1W, 5% 181895-1R20
R308 1K, 2512, 1W, 5% 181895-1001
R309 100 OHM, 0805, 1/10W, 1% 133625-1000
R310 100 OHM, 0805, 1/10W, 1% 133625-1000
R311 JUMPER, CHIP, 0805 133627
R312 JUMPER, CHIP, 0805 133627
R314 1.00K, 0805, 1/10W, 1% 133625-1001
R315 1.00K, 0805, 1/10W, 1% 133625-1001
R316 249 OHM, 0805, 1/10W, 1% 133625-2490
R317 249 OHM, 0805, 1/10W, 1% 133625-2490
R318 100K, 0805, 1/10W, 1% 133625-1003
R319 249 OHM, 0805, 1/10W, 1% 133625-2490
R320 1.00K, 0805, 1/10W, 1% 133625-1001
R323 487K, 0805, 1/10W, 1% 133625-4873
R324 12.1K, 0805, 1/10W, 1% 133625-1212
R325 12.1K, 0805, 1/10W, 1% 133625-1212
R327 JUMPER, CHIP, 0805 133627
R328 JUMPER, CHIP, 0805 133627
R329 16.2K, 0805, 1/10W, 1% 133625-1622
R330 78.7K, 0805, 1/10W, 1% 133625-7872
R331 2.00K, 0805, 1/10W, 1% 133625-2001
R334 100K, 0805, 1/10W, 1% 133625-1003
R335 100K, 0805, 1/10W, 1% 133625-1003
R336 10 OHM, 2512, 1W, 5% 181895-10R0
R337 162 OHM, 0805, 1/10W, 1% 133625-1620
R338 14.0K, 0805, 1/10W, 1% 133625-1402
R339 1.00K, 0805, 1/10W, 1% 133625-1001
R340 10.0K, 0805, 1/10W, 1% 133625-1002
R347 2.00K, 0805, 1/10W, 1% 133625-2001
ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors