How it Works
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COMPANION 3 SERIES II SM R05
Schematic
30 pgs746.72 Kb6

BOSE COMPANION 3 SERIES II SM R05 Schematic

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Companion® 3 Series II Multimedia
Speaker System
Product Description
©2007 Bose Corporation
Reference Number 297700-SM Rev. 05
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 ..............................................................................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
Warranty
The Bose® Companion® 3 series II 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 series II 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:
(no stand)
Control Pod: 2 1/2 “ D x 1 1/8” H
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
Satellites: Painted polymer finish
Bass Box: Slot ported
Bass Box Port Tuning: 45 Hz
2 1/2” H x 2 3/4” W x 2 3/8” D (6.14 x 6.86 x 6.03 cm)
(6.35 x 2.79 cm)
vinyl
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 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.
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1
2
3
4
8
6
5
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Bass Module Assembly Exploded View
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) 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 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
- XFORMER, TORROID, 105W, 15VDC, 7A TRANSFORMER, TOROID, 100V, 60Hz TRANSFORMER, TOROID, 230V, 50Hz
*300905-001 *300905-003 *300905-002 *303939-112 *303939-122 *303939-132
300954-001 300954-002 300954-003
*307876-011 *307876-033 *307876-022
271818-001
N/A
277613-001
1 1 1
1
1
3
1 1
*Capacitor C7 on the new power supply board may need to be replaced, see Service Bulletin 271885-B4
X3
X5
Figure 1. Bass Module Assembly Exploded View
6
Amplifier Module Assembly
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
*Capacitor C7 on the new power supply board may need to be replaced, see Service Bulletin 271885-B4
23
1
*307872-011 *307872-022 *307872-033
1 1 1
4 4 4
4
5
6
7
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Figure 2. Amplifier Module Assembly
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(
(
(
Packaging Part List
Item
Number
1 FEET, CLEAR SATELLITE 178321-04 2 2 FEET, RUBBER, BRACKET 260465 1 3 PACKING EPS, FILLE R ( includes bo th top and bottom filler) 300908 -001 1 4 CONTROL POD, 5 CABLE, IN P UT , 3. 5M M , 6FT, BL K 271 994-001 1 6 LINE CORD, 100 V , BLK, JAPAN
LINE CORD, 120 V , BLK, US/CANA DA LINE CORD, 220 V , BLK, EURO LINE CORD, 230 V , BLK, UK LINE CORD, 240 V , BLK, AUS
7 BASS MODULE, ASSY, U S/CAN ADA, 120V (Ele ctrof oil Logo )
BASS MODULE, ASSY, EUR O, 230V (Ele ctrofoi l Lo go) BASS MODULE, ASSY, JA PAN, 100V (Ele ctrofoil Logo) BASS MODULE, ASSY, US/C ANAD A, 1 2 0V (Pad p rint Logo) BASS MODULE, ASSY, EUR O, 230V (Pad print Logo) BASS MODULE, ASSY, JAP AN, 100V (Padprint Logo)
Complete bass mod ule package, includes Amp Mod Assy)
8 SAT, AS SY (Electrofoil Logo)
SAT , ASSY (Padpr int Lo go )
single arr ay, includes speaker stand)
9 OWNERS GUI DE, 3 LANG, US/CANA DA
OWNERS GUIDE, 5 LANG, EURO OWNERS GUIDE, 5 LANG, AP
10 CARTON, RSC, PRINTED 300911-001 1
- CARTON KIT 300911-001K 1
*Capaci tor C7 on the new power su pply boa r d may n ee d to be replaced, se e Servic e Bulletin 2 71885-B4
NON-REPAIRABLE) 307874-002 1
Description Part
Number
264514-0 01 262814-0 01
148203 134725
284243-0 01 *300905-001 *300905-003 *300905-002 *303939-112 *303939-122 *303939-132
300766-0 01
303938-0 02
296583 296584 299450
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Qty. Notes
1 3
1
2
1
5
1
2
3
6
3
7
8
9
10
Figure 3. Packaging Exploded View
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ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors
Reference Designator
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
Description Part Number Note
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ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors
Reference Designator
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
Description Part Number Note
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ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors
Reference Designator
R348 2.00K, 0805, 1/10W, 1% 133625-2001 R349 JUMPER, CHIP, 0805 133627 R350 JUMPER, CHIP, 0805 133627 R351 100OHM, 0805, 1/10W, 1% 133625-1000 R352 1.00K, 0805, 1/10W, 1% 133625-1001 R353 1.00K, 0805, 1/10W, 1% 133625-1001 R354 1.00K, 0805, 1/10W, 1% 133625-1001 R355 1.00K, 0805, 1/10W, 1% 133625-1001 R356 499K, 0805, 1/10W, 1% 133625-4993 R357 10.0K, 0805, 1/10W, 1% 133625-1002 R358 1.1 OHM, SMD, FUSE, 1/10W, 5% 192349-1R1A
R359 1.1 OHM, SMD, FUSE, 1/10W, 5% 192349-1R1A
R360 1.1 OHM, SMD, FUSE, 1/10W, 5% 192349-1R1A
R361 1.1 OHM, SMD, FUSE, 1/10W, 5% 192349-1R1A
R362 JUMPER, CHIP, 0805 133627 R401 100K, 0805, 1/10W, 1% 133625-1003 R402 10.0K, 0805, 1/10W, 1% 133625-1002 R403 221 OHM, 0805, 1/10W, 1% 133625-2210 R404 10.0K, 0805, 1/10W, 1% 133625-1002 R405 1.00K, 0805, 1/10W, 1% 133625-1001 R406 1.00K, 0805, 1/10W, 1% 133625-1001 R407 1.00K, 0805, 1/10W, 1% 133625-1001 R408 1.00K, 0805, 1/10W, 1% 133625-1001 R409 5.90K, 0805, 1/10W, 1% 133625-5901 R410 5.90K, 0805, 1/10W, 1% 133625-5901 R950 2.55K, 0805, 1/10W, 1% 133625-2551 R951 4.12K, 0805, 1/10W, 1% 133625-4121 R952 1.0M, 0805, 1/10W, 1% 133625-1004 R953 10.0K, 0805, 1/10W, 1% 133625-1002 R954 750 OHM, 0805, 1/10W, 1% 133625-7500 R956 88.7K, 0805, 1/10W, 1% 133625-8872 R957 1.21K, 0805, 1/10W, 1% 133625-1211 R958 10.0K, 0805, 1/10W, 1% 133625-1002 R959 1.00K, 0805, 1/10W, 1% 133625-1001 R960 36.5K, 0805, 1/10W, 1% 133625-3652 R961 36.5K, 0805, 1/10W, 1% 133625-3652 R962 1.0M, 0805, 1/10W, 1% 133625-1004 R963 26.7K, 0805, 1/10W, 1% 133625-2672 R964 750 OHM, 0805, 1/10W, 1% 133625-7500 R965 15.4K, 0805, 1/10W, 1% 133625-1542 R966 121K, 0805, 1/10W, 1% 133625-1213 R967 1.00K, 0805, 1/10W, 1% 133625-1001 R968 4.99K, 0805, 1/10W, 1% 133625-4991
Description Part Number Note
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3
3
3
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ELECTRICAL PARTS LIST
Main PCB Assembly
Resistors
Reference Designator
R969 JUMPER, CHIP, 0805 133627 R970 20.0K, 0805, 1/10W, 1% 133625-2002 R971 10.0K, 0805, 1/10W, 1% 133625-1002 R972 49.9K, 0805, 1/10W, 1% 133625-4992 R973 1.21K, 0805, 1/10W, 1% 133625-1211 R974 1.00K, 0805, 1/10W, 1% 133625-1001 R975 10.0K, 0805, 1/10W, 1% 133625-1002 R976 5.90K, 0805, 1/10W, 1% 133625-5901 R977 100 OHM, 0805, 1/10W, 1% 133625-1000 R978 100K, 0805, 1/10W, 1% 133625-1003 R979 10.0K, 0805, 1/10W, 1% 133625-1002 R980 4.99K, 0805, 1/10W, 1% 133625-4991 R981 100K, 0805, 1/10W, 1% 133625-1003 R982 1.00K, 0805, 1/10W, 1% 133625-1001 R983 1.00K, 0805, 1/10W, 1% 133625-1001 R986 POTENTIOMETER, 10K, 1B, 20% 273741-001 R987 1.54K, 0805, 1/10W, 1% 133625-1541
Description Part Number Note
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ELECTRICAL PARTS LIST
Main PCB Assembly
Capacitors
Reference Designator
C101 2.2uF, 1206, X7R, 10V, 20% 260361-2253 C102 .0068uF, BOX, 85C, 100V, 5% 137127-682 C103 .033uF, BOX, 85C, 63V, 5% 137127-333 C104 1000pF, 0805, COG, 50V, 5% 133622-102 C105 100 pF, 0805, COG, 50V, 5% 133622-101 C110 68pF, 0603, COG, 50V, 5% 188454-680 C111 68pF, 0603, COG, 50V, 5% 188454-680 C112 68pF, 0603, COG, 50V, 5% 188454-680 C125 .12uF, BOX, 85C, 50V, 5% 137127-124 C126 .12uF, BOX, 85C, 50V, 5% 137127-124 C127 .18uF, BOX, 85C, 50V, 5% 137127-184 C128 .01uF, BOX, 85C, 100V, 5% 137127-103 C129 .01uF, BOX, 85C, 100V, 5% 137127-103 C130 .0015uF, BOX, 85C, 100V, 5% 137127-152 C131 .0056uF, BOX, 85C, 100V, 5% 137127-562 C132 .12uF, BOX, 85C, 50V, 5% 137127-124 C133 .12uF, BOX, 85C, 50V, 5% 137127-124 C134 1000pF, 0805, COG, 50V, 5% 133622-102 C201 2.2uF, 1206, X7R, 10V, 20% 260361-2253 C202 .0068uF, BOX, 85C, 100V, 5% 137127-682 C203 .033uF, BOX, 85C, 63V, 5% 137127-333 C204 100 pF, 0805, COG, 50V, 5% 133622-101 C210 68pF, 0603, COG, 50V, 5% 188454-680 C225 .12uF, BOX, 85C, 50V, 5% 137127-124 C226 .12uF, BOX, 85C, 50V, 5% 137127-124 C227 .18uF, BOX, 85C, 50V, 5% 137127-184 C228 .01uF, BOX, 85C, 100V, 5% 137127-103 C229 .01uF, BOX, 85C, 100V, 5% 137127-103 C230 .0015uF, BOX, 85C, 100V, 5% 137127-152 C231 .0056uF, BOX, 85C, 100V, 5% 137127-562 C232 1000pF, 0805, COG, 50V, 5% 133622-102 C233 .12uF, BOX, 85C, 50V, 5% 137127-124 C234 .12uF, BOX, 85C, 50V, 5% 137127-124 C235 .1uF, 0805, X7R, 25V, 10% 181264-104 C236 10uF, EL, SMD, 105, 25V, 20% 255071-100E C238 10uF, EL, SMD, 105, 25V, 20% 255071-100E C239 .1uF, 0805, X7R, 25V, 10% 181264-104 C240 68pF, 0603, COG, 50V, 5% 188454-680 C241 68pF, 0603, COG, 50V, 5% 188454-680 C301 100 pF, 0805, COG, 50V, 5% 133622-101 C302 3300pF, 0805, X7R, 50V, 10% 133623-332 C303 100 pF, 0805, COG, 50V, 5% 133622-101 C305 3300pF, 0805, X7R, 50V, 10% 133623-332 C306 1uF, EL, SMD, 105C, 50V, 20% 255071-1R0H C307 1uF, EL, SMD, 105C, 50V, 20% 255071-1R0H
Description Part Number Note
13
ELECTRICAL PARTS LIST
Main PCB Assembly
Capacitors (continued)
Reference Designator
C307 1uF, EL, SMD, 105C, 50V, 20% 255071-1R0H C308 100 pF, 0805, COG, 50V, 5% 133622-101 C309 .015uF, 0805, X7R, 50V, 10% 133623-153 C310 100 pF, 0805, COG, 50V, 5% 133622-101 C311 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C312 100 pF, 0805, COG, 50V, 5% 133622-101 C313 100uF, EL, SMD, 105C, 25V, 20% 255071-101E C314 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C315 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C316 .1uF, 0805, X7R, 25V, 10% 181264-104 C317 .1uF, 0805, X7R, 25V, 10% 181264-104 C318 .1uF, 0805, X7R, 25V, 10% 181264-104 C319 .1uF, 0805, X7R, 25V, 10% 181264-104 C320 .47uF, 0805, X7R, 16V, 5% 196995-474 C321 .015uF, BOX, 85C, 100V, 5% 137127-153 C322 47uF, EL, SMD, 105, 25V, 20% 255071-470E C324 .15uF, BOX, 85C, 50V, 5% 137127-154 C325 0.1uF, 0805, X7R, 50V, 10% 133623-104 C326 .01uF, 0805, X7R, 50V, 10% 133623-103 C327 .1uF, BOX, 85C, 50V, 5% 137127-104 C328 .01uF, 0805, X7R, 50V, 10% 133623-103 C329 .1uF, BOX, 85C, 50V, 5% 137127-104 C330 .01uF, 0805, X7R, 50V, 10% 133623-103 C331 .01uF, 0805, X7R, 50V, 10% 133623-103 C332 1000pF, 0805, COG, 50V, 5% 133622-102 C333 1000pF, 0805, X7R, 50V, 10% 133623-102 C334 1000pF, 0805, X7R, 50V, 10% 133623-102 C335 1000pF, 0805, X7R, 50V, 10% 133623-102 C336 1000pF, 0805, X7R, 50V, 10% 133623-102 C337 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C338 1000pF, 0805, COG, 50V, 5% 133622-102 C339 1000pF, 0805, COG, 50V, 5% 133622-102 C340 1000pF, 0805, COG, 50V, 5% 133622-102 C341 1000pF, 0805, COG, 50V, 5% 133622-102 C342 47uF, EL, SMD, 105C, 25V, 20% 255071-470E C343 1000pF, 0805, COG, 50V, 5% 133622-102 C348 .01uF, 0805, X7R, 50V, 10% 133623-103 C349 .01uF, 0805, X7R, 50V, 10% 133623-103 C350 .01uF, 0805, X7R, 50V, 10% 133623-103 C351 .01uF, 0805, X7R, 50V, 10% 133623-103 C352 68pF, 0603, COG, 50V, 5% 188454-680 C353 68pF, 0603, COG, 50V, 5% 188454-680 C354 68pF, 0603, COG, 50V, 5% 188454-680 C355 68pF, 0603, COG, 50V, 5% 188454-680 C360 .01uF, 0805, X7R, 50V, 10% 133623-103
Description Part Number Note
14
ELECTRICAL PARTS LIST
Main PCB Assembly
Capacitors (continued)
Reference Designator
C401 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C402 .01uF, 0805, X7R, 50V, 10% 133623-103 C403 .01uF, 0805, X7R, 50V, 10% 133623-103 C404 1000pF, 0805, COG, 50V, 5% 133622-102 C950 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C951 68pF, 0603, COG, 50V, 5% 188454-680 C952 68pF, 0603, COG, 50V, 5% 188454-680 C953 .12uF, BOX, 85C, 50V, 5% 137127-124 C954 .12uF, BOX, 85C, 50V, 5% 137127-124 C955 10uF, EL, SMD, 105, 25V, 20% 255071-100E C956 .01uF, BOX, 85C, 100V, 5% 137127-103 C957 10uF, EL, SMD, 105, 25V, 20% 255071-100E C959 1000pF, 0805, COG, 50V, 5% 133622-102 C960 .12uF, BOX, 85C, 50V, 5% 137127-124 C961 .12uF, BOX, 85C, 50V, 5% 137127-124 C962 .0015uF, BOX, 85C, 100V, 5% 137127-152 C963 1000pF, 0805, COG, 50V, 5% 133622-102 C964 1000pF, 0805, COG, 50V, 5% 133622-102 C965 1000pF, 0805, COG, 50V, 5% 133622-102 C966 1000pF, 0805, COG, 50V, 5% 133622-102 C968 .01uF, 0805, X7R, 50V, 10% 133623-103 C969 10uF, EL, SMD, 105C, 25V, 20% 255071-100E C970 1uF, EL, SMD, 105C, 50V, 20% 255071-1R0H C971 .47uF, BOX, 85C, 50V, 5% 137127-474 C977 68pF, 0603, COG, 50V, 5% 188454-680 C980 68pF, 0603, COG, 50V, 5% 188454-680 C983 68pF, 0603, COG, 50V, 5% 188454-680 C988 68pF, 0603, COG, 50V, 5% 188454-680
Description Part Number Note
Inductors
Reference Designator
L301 330 OHM, BEAD, FERRITE, 0805, 1.5A 267539-331
Description Part Number Note
Diodes
Reference Designator
D301 SOT-23, BAV 99 147239 D302 SOT-23, BAV 99 147239 D303 SOT-23, BAV 99 147239 D304 SOT-23, BAV 99 147239 D305 SOT-23, BAV 99 147239 D306 SOT-23, BAV 99 147239
Description Part Number Note
15
ELECTRICAL PARTS LIST
Main PCB Assembly
Diodes (continued)
Reference Designator
D401 DUAL, SOT-23, BAW56 180738 D402 DUAL, SOT-23, BAW56 180738 D403 SOT-23, BAV 99 147239 D951 SOT-23, BAV 70 147249 D952 SOT-23, BAV 99 147239 D954 DUAL, SOT-23, BAW56 180738 D955 SOT-23, BAV 99 147239 ZR301 ZEN,SOD-123, .5W, 10V, 5% 174265-5240
Description Part Number Note
Transistors
Reference Designator
Q303 NPN, 1.3W, SOT-223 258416-001 Q304 BPLR, P, 40V, 200mA, SOT23 148596 Q305 BPLR, N, 40V, 200mA, SOT23 146819 Q306 BPLR, P, 40V, 200mA, SOT23 148596 Q307 BPLR, P, 40V, 200mA, SOT23 148596 Q308 BPLR, N, 40V, 200mA, SOT23 146819 Q309 BPLR, N, 40V, 200mA, SOT23 146819 Q401 BPLR, N, 40V, 200mA, SOT23 146819 Q402 BPLR, P, 40V, 200mA, SOT23 148596 Q403 BPLR, P, 40V, 200mA, SOT23 148596 Q950 BPLR, N, 40V, 200mA, SOT23 146819 Q951 BPLR, P, 40V, 200mA, SOT23 148596 Q952 BPLR, P, 40V, 200mA, SOT23 148596 Q953 BPLR, N, 40V, 200mA, SOT23 146819 Q954 BPLR, P, 40V, 200mA, SOT23 148596
Description Part Number Note
Integrated Circuits
Reference Designator
U3 IC, 0P AMP QUAD, SOIC-14, NJM2059 187472 U102 IC, 0P AMP QUAD, SOIC-14, NJM2059 187472 U125 IC, 0P AMP QUAD, SOIC-14, NJM2059 187472 U201 IC, 0P AMP QUAD, SOIC-14, NJM2059 187472 U301 IC, POWER AMP, 4x45W, 25-PIN, TDA7560 271833-001 U401 IC, TRANS, DUAL, SOIC-16, NJM13700 188650-001 U950 IC, TRANS, DUAL, SOIC-16, NJM13700 188650-001 U951 IC, 0P AMP QUAD, SOIC-14, NJM2059 187472
Description Part Number Note
16
ELECTRICAL PARTS LIST
Main PCB Assembly
Miscellaneous
Reference Designator
J301 CONN, HEADER, 3 POS, .156 133220-03 J302 CONN, JACK PHONE, 3.5MM 269841-001 J305 CONN, HEADER, INLINE, PCB MNT, 4P 133220-04 J307 CONN, RCA, DUAL, PC MOUNT 272376-001 J308 CONN, MINI DIN, R/A, 9-PIN 273227-001
Description Part Number Note
17
ELECTRICAL PARTS LIST
Power Supply PCB Assembly
Resistors
Reference Designator
R01 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 R02 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 R03 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 R04 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 R05 2.00K, 0805, 1/10W, 1% 133625-2001 R06 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 R07 412 OHMS, 0805, 1/10W, 1% 133625-4120 R08 JUMPER, CHIP, 0805 133627 R09 412 OHMS, 0805, 1/10W, 1% 133625-4120 R10 JUMPER, CHIP, 0805 133627 R11 10.0 OHM, 0805, 1/10W, 1% 133625-10R0 RT1 22K, THERMISTOR, RADIAL, 1/4W, 5% 177557
RT2 22K, THERMISTOR, RADIAL, 1/4W, 5% 177557
VR1 VARISTOR, MET OX, 275V, 140JOULE,
US
VR1 VARISTOR, MET OX, 300V, 140JOULE,
EURO
VR1 VARISTOR, MET OX, 175V, 140JOULE,
JAPAN
Description Part Number Note
3
3
273545-001
273545-002
273545-003
3
3
3
Capacitors
Reference Designator
C1 1.0uF, BOX, 85, 100V, 5% 137127-105 C2 .22uF, 0805, X7R, 25V, 10% 181264-224 C3 .047uF, 0805, X7R, 50V, 10% 133623-473 C4 .1uF, 0805, X7R, 10%, 25V 181264-104 C5 .1uF, 0805, X7R, 10%, 25V 181264-104 C7 .033F, EL, AL, 25V, 4T, US 260693-3331E C7 .039F, EL, AL, 25V, 20% EURO 260693-3931E C7 .039F, EL, AL, 25V, 20%, JAPAN 260693-3931E C8 .22uF, FILM, X2, 275VAC, 15MM 268166-224B
Description Part Number Note
Inductors
Reference Designator
L1 CHOKE, COMMON MODE, WITH HEADER 277667-001
Description Part Number Note
18
ELECTRICAL PARTS LIST
Power Supply PCB Assembly
Diodes
Reference Designator
BR1 RECTIFIER, BRIDGE, 8A, 400V 260684-400 D1 13V, ZEN, SOD-123, .5W, 5% 174265-5243 D2 SOT-23, BAV 99 147239
Description Part Number Note
Transistors
Reference Designator
Q1 BPLR, P, 40V, 200mA, SOT23 148596 Q2 BPLR, P, 40V, 200mA, SOT23 148596 Q3 MFET, N, 55V, TO-220FP 257359-001 Q4 BPLR, P, 40V, 200mA, SOT23 148596 Q5 BPLR, P, 40V, 200mA, SOT23 148596
Description Part Number Note
Miscellaneous
Reference Designator
F1 FUSE, 4.0A, 125V, .60X.19, SLOBLO, US
F1 FUSE, 2.0 AMPS, AXIAL, EURO 269855-02000
F1 FUSE, 4.0A, 125V, .60X.19, SLOBLO, JAPAN 135677-12
J1 CONN, HEADER, LOCKING, TOP ENTRY 193369-002
J2 CONN, HEADER, 3.96mm, 7-pin 272385-07
J3 CONN, HEADER, 3 POS, .156 133220-03
Description Part Number Note
135677-12
FUSE, 3.15A, 250V, 5.5X21mm, SLO-BLO, US
298780-3150
3
3
3
3
3
3
19
Disassembly Procedures
1. Module Assembly Removal
1.1 Remove the knob from the unit.
1.2 Peel back the label and remove it.
Note: The label will become damaged
once removed from the rear panel. A replacement label must be installed during reassembly.
Bass Module
1.3 Remove the three silver Phillips-head screws located on the right hand side (under the label) and the five Phillips-head or T-15 Torx head screws around the heat sink fins.
1.4 Slide the electronic module back slightly.
20
Disassembly Procedures
1.5 Disconnect the two connectors
shown and remove the module assembly.
Bass Module Cont.
Speaker Connector
Transformer Connector
1.6 Disconnect the two connectors on
the power supply PCB.
1.7 Remove the seven T-15 Torx screws shown, to remove the power supply PCB.
Note: The PCB is mounted on stand­offs which will become loose when removing the screws.
Note: The main PCB is glued to the heat sink assembly however it can be repaired without having to remove it.
Power supply PCB
ConnectorMain PCB
Connector
21
2. Power Transformer Removal
2.1 Remove the module assembly,
perform procedure 1.
2.2 Remove the bolt at the center of the power transformer.
2.3 Remove the transformer and shield-can from the bass box.
Disassembly Procedures
Bass Module Cont.
3. Woofer Removal
3.1 The Grille on the bass module is glued
into place. The woofer is not replaceable. Replace the bass box assembly if the woofer is defective.
22
Test Procedures
Test Equipment required:
1. Audio Signal Generator
2. Oscilloscope
3. Digital Multimeter
Test Set up
Connect the satellites to the output jacks on the bass module. Connect the control pod to the DIN jack on the bass module. Connect a signal generator to the audio input cable and connect the cable to the input jack on the bass module.
1. Bass Module Air Leak test
1.1 Apply a 40 mVrms, 40 Hz signal to the input of the bass module.
1.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to
the center detent (flat) position.
1.3 Listen carefully for air leaks along all glued joints, around the heat sink, connectors and at the woofer mounting location.
1.4 Repair any air leaks around the heat sink and connectors. Replace any bass module that has air leaks around the bass box or woofer mounting location.
2. Bass Module Sweep Test
2.1 Apply a 200 mVrms, 100 Hz signal to the input of the bass module.
2.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to
the center detent (flat) position.
2.3 Listen carefully as you sweep the bass module from 100 Hz to 300 Hz, then from 300 Hz to 100 Hz.
2.4 Listen carefully for buzzes, rattles, or other extraneous noises from the woofer, cabinet, plastic trim parts, or heat sink. A slight whooshing sound from the port at approximately 45 Hz is acceptable.
2.5 Repair any noise heard from around the heat sink and connectors. Replace the bass module if it has noises from the woofer or cabinet area.
23
Test Procedures
3. Bass Module Tone Control Test
3.1 Apply a 90 mVrms, 100 Hz signal to the input of the bass module.
3.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to
the center detent (flat) position.
3.3 Rotate the tone control fully clockwise and counter clockwise.
3.4 Verify that the bass level cleanly increases and decreases in level.
4. Satellite Air Leak Test
4.1 Apply a 270mV, 200 Hz signal to the input of the bass module.
4.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to
the center detent (flat) position.
4.3 Listen carefully for air leaks along edges of the satellite and near the grille where the Twiddler speaker is installed.
4.4 Replace any satellite that is defective.
5. Satellite Sweep Test
5.1 Apply a 270mV, 100 Hz signal to the input of the bass module.
5.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to
the center detent (flat) position.
5.3 Sweep the satellite speakers from 100 Hz to 3 kHz then from 3 kHz to 100 Hz.
5.4 Listen carefully for buzzes, rattles, or other extraneous noises from the Twiddler™ speakers,
plastic satellite enclosure, grille, or internal wires.
5.5 Replace any satellite that is found to be defective.
24
Test Procedures
6. Control Pod Functional Test
6.1 With the system completely set up, turn on the system using the power switch located on the bass
module.
6.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to the center detent (flat) position.
6.3 Touch the center of the control pod . Verify that the LED turns from green to orange and orange to green with each touch.
6.4 Verify that the sound is muted and un-muted when the LED changes color and that there is no audible pop when switching from mute to un-mute.
6.5 Rotate the control pod ring, verify that the volume increases and decreases and that the ring moves smoothly.
6.6 Replace any control pod that is defective.
25
Theory of Operation
The Companion® 3 Multimedia Speaker System is a 2.1 system designed to be used as a computer sound system.
The electronics contain signal processing circuitry and the amplifiers for the woofer and satellites. A 120 volt AC input, 14 volt DC power supply powers the electronics. The power supply is located on a separate PC board.
The signal processing electronics in the bass module include equalizers, bass summing, TrueSpace™ processing, level compression, to prevent clipping at high volume, and protection circuitry.
The crossover frequency between bass and satellites is 300 Hz. The system is rated at 60 watts to the woofer and 18 watts to each satellite. The bass box is tuned to 45 Hz.
The following is a detailed description of the circuitry on the power supply, amp board, and remote board.
1.0 Power Supply (refer to the schematic diagram 276769)
The power supply is located on the heat sink of the module and is the smaller PCB of the two. The 120 volt AC is received from the AC inlet jack and switch at J1. The AC is fused by the 4 amp F1 fuse. VR1 protects against high voltage surges. The 120 volts is sent out to the 15 VAC, 7 amp toroid transformer mounted to the interior of the bass box on J2. The 15 VAC secondary voltage comes back into the board on J2. The 15 VAC is converted to 15-20 volts DC by bridge rectifier BR1.
Q1, Q2 and Q3 form a pre-regulator to keep the DC output voltage at 14 VDC. The 13 volt zener D1 serves as a reference to Q1. When the input AC goes one diode drop above the zener voltage, Q1 turns on. This turns off Q2, allowing Q3 to turn off, which disconnects the input rectified AC from charging C7, the 3300 uF filter capacitor above 14 volts. This makes the voltage at C7 stay at about 14 volts. C2, C3 and C4 slow down the turn on of Q3 to reduce interference from this circuit to the amplifier.
When the rectified voltage is lower than 14 volts, Q1 turns off, turning on Q2 and then Q3, allowing C7 to charge whenever the ratified voltage from BR1 is above the voltage left on C7. The 14 VDC is sent to the amplifier board over J3.
RT1 is a 22K thermistor at room temperature. It is mounted on the heat sink between BR1 and Q3. It senses the system temperature and sends a signal to the main amp board to help reduce system gain when the heat sink is getting too hot.
2.0 Main Amplifier Board (refer the schematic diagram 276762)
On sheet 1 of 3, location (D8), is the A input. U3, (D7) buffers the inputs to be sent to the remote control through J308. The remote mixes the A with the B input, on the remote, and sends the signal back to the main PCB though J308. The control pod is further described in section 3.
26
Theory of Operation
2.0 Main Amplifier Board (continued) (refer the schematic diagram 276762)
The signals coming into J308 (C7) are sent to sheet 3 of 3 (L_VOL and R_VOL). Three amplifiers in U201 (D8-4) are the equalizers for the right channel and U125, (A8-4) are the equalizers for the left channel. U951 (C8-3) in conjunction with U950 (C-2), the voltage controlled amplifier, form the bass summer and dynamic bass equalizer.
The three stage equalizers for the equalizer perform the bass cutoff, mid-range cut, and high end boost, in that order. They are 4-pole Salen-Key elliptical filters.
The bass signal is formed from the two inputs summed and low pass filtered by U951. The bass level is detected by U125, D951, D952, Q950, Q951 and Q952 (B-6) forming an active peak detector. C955 and C957 filter the detected peaks to form the control voltage for the VCA in U950. When the bass level is very low, the signal is boosted by U951. U950 is in the negative feedback path for U951, and when its gain is low, U951 gain goes up, boosting the bass. U950 gain goes down when control current generated by Q952 goes down, as controlled by peak detector circuit.
Q953, Q954 and D954 (D-2) form the peak detector on the bass outputs. Peaks near the negative rail are conducted through D954 and Q953 to charge C969. Voltage on C969 is converted to a current by Q954 which controls the VCA in U950. U950 is in the negative feedback loop of U951, so when U950 gain is high, less bass is output. Near clipping detected by the peak detector is converted to high current by Q954, causing high gain in U950, reducing the gain in U951 and less bass. R980 and C969 determine the attack time of the compressor, and R981 and C969 determine the release time.
Also on sheet 3 of 3, U201 (A-3) is the virtual ground generator. The 10 volt line is divided by two R225 and R226, filtered by C970 and C235, and input to U201. The 5 volts generated by U201 is used by all the signal processing circuitry as the virtual ground reference.
The right and left outputs, EQ_R and EQ_L are sent to page 2 of 3 (B3). U102 (B3) forms the true space processing and the satellite signal compressors. TrueSpace™ processing consists of U102B and U102D which act a low pass filters with a -3 dB point of 3 kHz. This signal is subtracted from the opposite channel signal by U102A and U102C.
R204 and R105 determine how much TrueSpace signal is subtracted. The 127K compared to the 10K value of the main signal inputs gives a TrueSpace signal of -18 dB relative to the main signal. To keep the levels the same in mono conditions, the same amount of low pass filtered signal is added back to the main channel of itself, through R106 and R206.
The satellite compressor consist of D401, D402, and Q401 (D7) which detect the right and left chan­nel level, charging C401 when the R+, R-, L+ and L- signals get near the negative rail. The compres­sor attack time is determined by R403, and the release time is determined by R404. When C401 charges negatively, Q402 and Q403 convert this to current which increases the gain of U401A and U401B. U401 is in the negative feedback path of U102A and U102C, and higher gain reduces the gain through the satellite channels. Therefore, high signal levels near clipping reduces the gain of the satellite channels, compressing the signals.
The compressed signals are sent to the main amplifier on sheet 1 of 3 over signals Sat_Drv_L and Sat_Drv_R. The bass signal from the bass compressor on sheet 3 of 3, BASS_DRV, is sent to two stages of bass equalization at U3B and U3D (D7). These form the 40 - 50 Hz boost, and the 100 Hz cut for the bass box equalization.
27
Theory of Operation
2.0 Main Amplifier Board (continued) (refer the schematic diagram 276762)
The two satellite signals, and the bass signal are sent to the power Amp IC, U301 (C3). One channel of the power Amp IC is used for each satellite, and the bass signal uses two channels of the power chip to drive both of the woofer voice coils.
The Amp IC can provide up to 40 watts into 2 ohms per channel. The woofer coils are 2 ohms each, and 60 watts total is specified for the woofer drive. Each satellite can receive 18 watts each into their 4 ohm impedance.
The mute signal from the remote unit comes in through J308, is slowed down by C314 to prevent pops.
The 10 volts for the signal processing circuitry is generated by D301, a 10 volt zener, and Q303 in an emitter follower configuration. Q303 is specified up to 500 ma, and the entire remote and signal processor consumes about 100 ma.
For thermal protection, Q304, Q305, and Q307 (A5) process the voltage generated by the thermistor on the power supply and R337 and generate a current that goes higher as the temperature rises. This current is summed into the three compressors, reducing the gain through the system at high tempera­tures. This prevents the heat sink from getting too hot. R337 determines the voltage division ratio and therefore the haet sink maximum temperature.
Q308 and Q309 (D5) form a voltage detector that determines when power has reached sufficient voltage for proper power amplifier operation. If the DC voltage falls below 10 volts, the power amplifier will be muted. This prevents power up and down pops.
3.0 Control Pod Remote (refer to schematic diagram 272092)
The remote receives the A input signal from the bass module over J4. This is summed with the B input on the remote control by U2. U2 drives the volume control pot R31. The adjusted volume is sent to U4 to drive the headphone outputs J5 and connector J4 back to the bass module. U1 buffers the 5 volts reference to the sleeve of J5. J5 is a switched jack, and the switch mutes the main speakers when a headphone plug is inserted. This grounds the mute signal, which is active low.
U3 is a touch sensor switch. When the operator touches the touch sensor pad on the remote, which is connected electrically to WT1 and WT2, the QT113 chip will sense this and toggle the standby line. This changes the LED (DS1) color from yellow to green. The green led is always on, and the red led glows during standby, as driven by Q1, to mix with the green to show yellow color. U3 output also drives the standby line to the bass module power amplifier. Standby is active high on the remote, and inverted in the bass module to the active low signal required by the power amplifier.
The remote amplifiers are powered by the 10 volt supply coming in at J4 from the bass module. The virtual ground from the bass module comes in as the VCCD2 signal reference from the signal pro­cessing. ZD1 is a 4.7 volt zener which generates the local power supply voltage from the 10 volt input. R41 is the current limiting resistor for ZR1. This 4.7 volts powers U3.
At each I/O connector, resistors, capacitors, diodes, and spark gaps are present on each signal to protect against RF emissions, susceptibility, and ESD.
28
SERVICE MANUAL REVISION HIST OR Y
Date Revision
Level
9/06 00 Do c um ent released at 4/07 01
01
8/7 02 Part number changes
3// 08 03 Added fuse pa rt number
3//08 04 Deleted part number for
6/09 05 Del eted part number for
1/10 05 Changed part nu mb er
Description of Change Change Driven
revision 00 Added pad print ed logo part numbers for Bass module an d Sat ellites
Ne w part numbe r for po wer sup ply board – 30 7872-011 – 120V 30 7872-022 – 100V 30 7872-033 – 240V
Mod Assem bly 30 7876-011- 120V 30 7876-022- 100V 30 7876-033- 240V
Co ntrol Pod 307874-002
298780-3150
BOTTOM EPS FILLER.
BOTTOM EPS FILLER.
178321-08 to 178321-04
By
Service Manual
Release
I m provemen t of
logo
Imp rov ed power
supply.
Imp rov ed power
sup p ly and Contro l
pod.
Tw o v er s ions of
the Power PCB,
need two versions
of th e fu se.
The top filler now
inc ludes bo th top
and bottom filler.
The top filler now
inc ludes bo th top
and bottom filler.
ECN 46966 8
Pages
Affected
All
5, 7
6
5, 7
18
7
6
29
SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
Bose Corporation The Mountain Framingham Massachusetts USA 01701
P/N 297700-SM Rev. 05 09/2007 (H):
http://serviceops.bose.com
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