Contents

SAFETY INFORMATION ................................................................................................................... 2

Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 3
Specifications ................................................................................................................................... 4
Disassembly Procedures ............................................................................................................. 5-6
Figure 1. 220V Switch ...................................................................................................................... 6
Figure 2. Dual Voltage Switch .......................................................................................................... 6
Figure 3. Exploded View .................................................................................................................. 7
Test Procedures ............................................................................................................................ 8-9
System Test Procedures ................................................................................................................. 8
PCB Test Procedures ....................................................................................................................... 8
Troubleshooting Tips ....................................................................................................................... 9
Part List Notes ................................................................................................................................ 10
VRM/LSSP/RCM Part List ......................................................................................................... 11-12
Figure 4. Exploded View ................................................................................................................ 12
Electrical Part List ..................................................................................................................... 13-14
Packaging Part List ................................................................................................................... 15-16
Figure 5. Packaging View .............................................................................................................. 16
Figure 6. PCB Layout .................................................................................................................... 17

1
 SAFETY INFORMATION

1. Parts that have special safety characteristics are identified by the symbol on
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 American National Standards Institute (ANSI)
C101.1 “Leakage Current for Appliances” and Underwriters Laboratories
(UL) 1492 (71). With the unit AC switch first in the ON position and then in
OFF position, measure from a known earth ground (metal water pipe,
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 outlet and repeat test. ANY MEASUREMENTS NOT WITHIN
THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ-
ARD 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 be
tween the jumpered AC plug and each exposed metallic cabinet part on the
unit. When the exposed metallic part has a return path to the chassis, the
reading should be between 1 and 5.2 Megohms. When there is no return path
to the chassis, the reading must be “infinite”. If it is not within the limits specified,
there is the possibility of a shock hazard, and the unit must be repaired and re-
checked before it is returned to the customer.

2
 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 workstation.

• 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.

CAUTION: THE LSSP/VRM/RCM CONTAINS NO USER

-SERVICEABLE PARTS. TO PREVENT WARRANTY
INFRACTIONS, REFER SERVICING TO WARRANTY
SERVICE STATIONS 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.

3
 SPECIFICATIONS

Dimensions: 9.06" x 6.06" x 5.91" (23 x 15.4 x 15 cm)

Weight: 15.5 lb (7.03 kg)

Maximum Acoustic Output: 100 dB SPL @ 1m, 300-3kHz pink noise

Input Impedance: 10 kΩ

Sensitivity: 50 mVrms @ 100Hz, Volume at Maximum

Power Output: 3.1W, 2Ω load

Distortion: THD < .2% at rated power, 100Hz to 10 kHz

Separation: > 50 dB, 100Hz to 10kHz

Output Noise: < 100 µV, A-Weighted

Hum: < 200 µV

Standby Line Power: < 3.0W @ nominal line input voltage

4
 DISASSEMBLY PROCEDURES
Note: Refer to figure 3 for the following 6.2 Press the baffle into the enclosure.
procedures. Numbers in parenthesis Replace the six screws (4) that secure the
correspond to call outs in figure 3. baffle to the enclosure.

1. Grille Removal 7. PCB Removal

1. Grasp the edge of the grille (1) and pull 7.1 Perform procedure 5 first.
it out from the enclosure (25).
7.2 Grasp the front edge of the PCB (9)
2. Grille Replacement and pull the PCB forward.
Note: Earlier versions used clips to hold
2.1 Line up the grommets on the grille (1) the front of the PCB in place. Loosen the
with the holes in the enclosure (25). Press two screws before pulling the PCB out.
the grille into place.
8. PCB Replacement
3. Driver Removal
8.1 Line up the PCB (9) so that the wires
3.1 Perform procedure 1 first. connected to the PCB are located toward
the rear of the enclosure (25).
3.2 Remove the three screws (3) that
secure the driver (2) to the enclosure (25). 8.2 Push the PCB into the two slots that
are located in the rear of the enclosure.
3.3 Lift the driver out of the enclosure and
cut the wires as close as possible to the 11. Audio Input Cable Removal
driver terminals.
11.1 Perform procedure 5 first.
4. Driver Replacement
11.2 Disconnect the cable (15) at P1.
4.1 Strip the wires and attach them to the
replacement driver (2). 11.3 Remove the E-ring (16) that secures
the cable to the enclosure (25).
4.2 Replace the three screws (3) that
secure the driver to the enclosure (25). 11.4 Pull the cable out from the rear of the
enclosure.
5. Baffle Removal
12. Audio Cable Replacement
5.1 Perform procedure 1 first.
12.1 Insert the cable (15) through the hole
5.2 Remove the six screws (4) that secure labeled Audio Input, which is located in the
the baffle (24) to the enclosure (25). rear of the enclosure (25).

5.3 Grasp the baffle by the port and pull the 12.2 Replace the E-ring (16) that secures
baffle out from the enclosure. the cable to the enclosure.

6. Baffle Replacement 12.3 Connect the end of the cable to P1 on

the PCB (9).
6.1 Line up the baffle (24) so that the port
tubes are located on the end opposite of
the transformer.

5
 DISASSEMBLY PROCEDURES
9. Transformer Removal

9.1 Perform procedure 5 first.

9.2 Remove the two screws (13) that

secure the transformer (5) to the enclosure
(25).

9.3 Perform procedure 7.

9.4 Remove the wires that attach the

transformer to the PCB (9) and the line
cord (6) or voltage switch.
Note: Record the wire configuration.

10. Transformer Replacement

10.1 Lower the transformer (5) into the

enclosure (25) so that the transformer wires
are located towards the line cord (6).
Figure 1. 220V Switch

10.2 Attach the transformer wires to the

line cord or voltage switch and the PCB (9).
Note: Refer to figure 1 and 2 for the 220V
and dual voltage wiring configuration.

Figure 2. Dual Voltage Switch

6
Figure 3. Exploded View

7
 TEST PROCEDURES
System Test Procedures PCB Test Procedures

1. Rub and Tick

General Test Set Up
Note: Adjust the volume to maximum.
Connect a 2Ω load resistor to the left and
Connect the slave speaker to the powered
right output. Set the volume control to
speaker.
maximum, unless otherwise noted.
1.1 Apply a 100mVrms, 10Hz signal to the
4. Idle Current
left and right inputs.
4.1 Connect an AC meter to one side of
1.2 No extraneous noises such as rubbing,
the secondary of the transformer.
scraping or ticking should be heard.
Note: To distinguish between normal
4.2 The idle current should be less than
suspension noise and rubs or ticks, dis-
310mA.
place the cone of the driver slightly with
your fingers. If the noise can be made to go
5. Gain
away or get worse, it is a rub or tick and the
driver should be replaced. If the noise stays
5.1 Apply a 40mVrms, 1kHz signal to the
the same, it's normal suspension noise and
left and right input.
it will not be heard with program material.
5.2 Reference a dB meter to the applied
2. Air Leak
signal.
Note: Adjust the volume to full. Connect the
slave speaker to the powered speaker.
5.3 Measure the left and right output. It
should be 15.9 ± 1.5dB.
2.1 Apply a 100mVrms, 100Hz signal to
the left and right inputs.
6. Frequency Response
2.2 Block the ports and listen for any air
6.1 Apply a 40mVrms, 1kHz signal to the
leaks. Repair any that are found.
left and right input.
3. Sweep Test
6.2 Reference a dB meter to the left and
Note: Adjust the volume to full. Connect the
right output.
slave speaker to the powered speaker.
6.3 Measure the left and right output
3.1 Apply a 100mVrms, 10 Hz signal to the
according to the following table.
left and right input.
Frequency Output (db) Tolerance
3.2 Sweep the speaker from 10Hz to (db)
15kHz. Listen for any buzzes or extraneous 100Hz 15.7 ±1.8
noises. 1kHz Ref -
Note: Port noise (whooshing sound) at 80- 10KHz 15.9 ±1.8
100Hz is acceptable.

8
 TEST PROCEDURES
Troubleshooting Tips
7. Distortion Test

7.1 Apply a 1KHz signal at a level to obtain 1. Input Cable

a 2.5Vrms output at the left and right
output. 1.1 The resistance from the tip to ring on
the left or right input cable should be 17kΩ
7.2 The distortion measured at the left and to 20kΩ.
right output should be <.2%.
2. Transformer
8. Compressor Test
2.1 The primary of the 120V transformer
8.1 Apply a 220mVrms, 10kHz signal to should be 5 to 40Ω.
the left and right input.
2.2 The primary of the dual voltage
8.2 Measure the left and right output. It transformer should be 50 to 60Ω (BLK-OR)
should be <3.6Vrms. and 60 to 70Ω (BRN-BL).

9. Separation Test 2.3 The primary of the 230V transformer

should be 120 to 150Ω.
9.1 Apply a 340mVrms, 1kHz signal to the
left input only. 2.4 The secondary voltage should be 7
to 8 Vrms measured between the yellow
9.2 Measure the right channel output. It and red wires.
should be <200mVrms.
Note: Repeat this test for the other chan-
nel.

10. Noise

10.1 Terminate the left and right inputs.

Measure the noise at the left and right
output. It should be <250uV, A- weighted.

11. DC Offset

11. Connect a DC meter to the left and

right output. The left and right output should
measure <50mVDC.

9
 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 located on the PCB are listed in the 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. This is part of the lit kit.

5. This is part of the accessory kit.

6. This is used in the 220V lit kit.

7. This is used in the military lit kit.

8. This is used on the Lifestyle® Powered Speaker System.

9. This is used on the Video RoomMate®.

10. This is used on the RoomMate ® Computer Monitor.

10
 VRM/LSSP/RCM PART LIST
(Refer to figure 4)

Item Part Description See Note

Number Number
1 127737-11 GRILLE ASSY, BK/BK, PWRD 8
127737-C2 GRILLE ASSY, WH, PWRD 8
127737-21 GRILLE ASSY, GRY, PWRD 9
127737-94 GRILLE ASSY, PLAT, PWRD 10
1 127738-11 GRILLE ASSY, BK, ACC 8
127738-C1 GRILLE ASSY, WH, ACC 8
127738-21 GRILLE ASSY, GRY, ACC 9
127738-91 GRILLE ASSY, PLAT, ACC 10
2 123985-5 DRIVER ASSY, SHLD, 4.5"
3 140309-10 SCREW, HILO, 10-16x.625,
HEXW, HEX
4 172672-12 SCREW, #8, 3/4", COMBO
DRIVE
5 128056 or 264601 TRANSFORMER, 120V 3
131735 or 266468 TRANSFORMER, 120/220V 3
128057 TRANSFORMER, 230V 3
6 171419 LINE CORD, POL, 120V, ~ 7'.6" L 3
141914 LINE CORD, 220V 3
141915 LINE CORD, 240V 3
149500 LINE CORD, 120V, GRAY 3, 10
7 124724 STRAIN RELIEF, BUSHING, 2
COND
8 125618 CONN, BUTT SPLICE, FEMALE
9 146903 PCB ASSY, VRM 1, 2
10 123990-01 TERMINAL STRIP
11 123991 T NUT
12 172783-08 SCREW, #6, 1/2", COMBO
DRIVE
13 121326-12 SCREW, HILO, 8-18X3/4, HEXW,
HEX
14 138436-01 NAMEPLATE, CINEMA SURR 8
138436-03 NAMEPLATE, CINEMA SURR 8
128663 NAMEPLATE, LOGO 9
138436-04 NAMEPLATE, RCM 10
15 130709 CORD, BLACK INPUT, ~ 6' L
16 128043 E RING, RETAINER, .8"
17 127649 KNOB, BLACK 8, 9
137612 KNOB, WHT 8
136255 KNOB, GRAY 10
18 128429 NUT, HEX, M7x.75mm
19 128430 WASHER, FLAT, 7.2mm
20 131062 CLIP, CABLE, DBL FACE ADH,
.76"
21 128407 GASKET, DRIVER
22 128539 CABLE, VIDEO RM
23 128861 POTENTIOMETER, 20K *Use for 6
127727* POT MOUNTED TO PCB pin version

11
 VRM/LSSP/RCM PART LIST
(continued)
(Refer to figure 4)

Item Part Description See Note

Number Number
24 131741-02A BAFFLE, BLK, POWERED 8, 9
131741-02B BAFFLE, WHITE, POWERED 8
131741-02D BAFFLE, PLATINUM, POWERED 10
131741-01A BAFFLE, BLK, ACCESSORY 8, 9
131741-01B BAFFLE, WHITE, ACCESSORY 8
131741-01D BAFFLE, PLAT, ACCESSORY 10
- 124854 SWITCH, SLIDE, 120/220 SEL 3
Dual Voltage
- 131905 SWITCH, SLIDE, DPDT, 3
ON/OFF 220V, 240V
- 128409 GASKET, PWRD SPKR, SWITCH 220V, 240V
- 125571 NUT, SPEED, FLAT 220V, 240V
- 103122-10 SCREW, TAPP, 6-20X.625, PAN 220V, 240V
- 103593 BUMPER, PROTECTIVE, ADH
BACKED
- 111114 SPACER, SQUARE, .75"
- 125571 TINNERMAN NUT Early Vers.
- 124722 TINNERMAN U CLIP Early Vers.

Figure 4. Exploded View

12
 ELECTRICAL PART LIST
Resistors

Reference Description Part Number Reference

Designator
R1, 5 1 MEG, CF, 5%, 121243-1211055
52MM
R2 91K, CF, 2%, 52MM 121243-1219132
R3, 106, 206, 100K, CF, 2%, 121243-1211042
115, 215 52MM
R4 10.0K, MF, 1%, 121245-2211002
52MM
R101, 107,108, 11K, CF, 2%, 52MM 121243-1211132
110, 117, 217,
119, 201, 207,
208, 210, 219
R103, 102, 18.2K, MF, 1%, 121245-2211822
202, 203 52MM
R104, 204 8.2K, CF, 2%, 121243-1218222
52MM
R105, 114, 820 Ω, CF, 2%, 121243-1218212
205, 214 52MM
R109, 209 36K, CF, 2%, 52MM 121243-1213632
R111, 211 1.00K, MF, 1%, 121245-2211001
52MM
R112, 212 1.69K, MF, 1%, 121245-2211691
52MM
R113, 213 30K, CF, 2%, 52MM 121243-1213032
R116, 216, 218 5.1K, CF, 2%, 121243-1215122
52MM
R120, 220 1.5Ω, CF, 5%, 121243-1211R55
52MM
R121, 221 2.00K, MF, 1%, 121245-2212001
52MM

Capacitors

Reference Description Part Number Reference

Designator
C1, 3, 7 .1uF, MONO, Z5U, 136804-104
50V, 20%
C2 10uF, EL, 35V 119944-100
C4 .22uF, MONO, Z5U, 136804-224
50V, 20%
C5, 6 4700uF, EL, 16V 124997
C101, 109, 1uF, EL, 137265-1R0
201, 209
C102, 202 47pF, CER, 10%, 137269-470
50V
C103,203 .15uF, BOX, 85, 137127-154
50V, 5%
C104,204 .0068uF, FILM, 85, 137123-682
50V, 5%
C105, 205 .1uF, FILM, 85, 50V, 137123-104
5%

13
 ELECTRICAL PART LIST
Capacitors
(continued)

Reference Description Part Number Reference

Designator
C106, 206 .0018uF, FILM, 85, 137123-182
50V, 5%
C107, 207 22uF, EL, 50V 119944-220
C108, 208 100pF, CER, 10%, 123530-101
50V, CUT
C110, 210 .22uF, BOX, 85, 137127-224
50V, 5%
C111, 211 .0015uF, 1206, Z5U, 124958-1521
50V, 20%
C112 .0033uF, MONO, 136804-332
Z5U, 50V, 20%
C212 .012uF, 1206, Z5U, 124958-1231
50V, 20%

Semi Conductors

Reference Description Part Number Reference

Designator
U1 RC4559, OP AMP, 108568
DUAL, DIP-8
U2 QUAD OP AMP 120535 or 112996
U3, 4 OP AMP 127067 or 192824 see bulletin 143922-B1
Q1 PNP, SMALL 119168
Q101, 201 NPN, TAPE 117921
D1,101,102, 1N4148, 52MM 121501
201, 202 AXIAL
D2 DIODE 121035
Z1 BRIDGE 135687
RECTIFIER

Miscellaneous

Reference Description Part Number Reference

Designator
NUT, KEP 4-40 100413-5
SCREW, 4-40X.25, 103140-04
PHIL, PAN HD
SHIELD, PCB 128552
SHIELD, METAL 128740
SPACER, NYLON 128804
RIVET, PLASTIC 128805
HEATSINK 129364
P1 HEADER, 4 PIN 127740-04

14
 PACKAGING PART LIST
(Refer to figure 5)

Lifestyle® Powered Speaker System Packaging

Item Part Number Description QTY See

Number Note
1 137421 CARTON, RSC, LIFESTYLE 1
2 124921 END CAP, FOAM 2
3 129026 PACKING, CREASE SHT, D/C 2
4 140774-1C LIT KIT, LS, 120V 1
140774-2C LIT KIT, LS, 220V 1
140774-6C LIT KIT, LS, MILITARY 1
4 138659 OWNER'S MANUAL, LIFESTYLE 1 4
4 187981 WARRANTY SERVICE LIST 1 4
4 141478 BROCHURE, ALL PRODUCTS 1 4
4 181357 INFO CARD, WARRANTY, U.S. 1
181460 INFO CARD, WARRANTY, MULTI LANG 1 4, 6
4 103351 BAG, POLY, 10x14.5 1 4
4 149470 SHEET, 1 YEAR WARRANTY 1 4
4 149978 SHEET, INFORMATION, SAFETY 1 4
4 147013 ADAPTOR, 120/230V, POLARIZED 1 4, 7
4 147751 SHEET, INSTRUCTION, MILITARY 1 4, 7
5 140775-BC ACCESSORY KIT, LS, WHITE 1
5 137455 CABLE, STEREO INPUT (50 FT) 1 5
5 140236 CABLE, INTERCONNECT, WHITE 20FT 1 5
5 103351 BAG, POLY, 10x14.5 1 5
6 123831 BAG 2

Video RoomMate® Packaging

Item Part Number Description Q t y Note

Number
1 129038 CARTON, RSC, VRM 1
2 124921 END CAP, FOAM 2
3 129026 PACKING, CREASE SHT, D/C 2
4 140774-1A LIT KIT, VRM, 120V 1
140774-6A LIT KIT, VRM, MILITARY 1
4 127331 MANUAL, OWNER'S, VRM 1 4
4 125521 SHEET, INSTRUCTION, SAFETY 1 4
4 187981 WARRANTY SERVICE LIST, NEW 1 4
4 141478 BROCHURE, ALL PRODUCTS 1 4
4 103351 BAG, POLY, 10x14.5 1 4
4 149978 SHEET, INFORMATION, SAFETY 1 4
4 147751 SHEET, INSTRUCTION 1 4, 7
4 147013 ADAPTOR, 120/230V, POLARIZED 1 4, 7
5 140775-AA ACCESSORY KIT, VRM, BLACK 1
5 128596 ADAPTOR, CABLE, MONO 1 5
5 130915 CABLE, INTERCONNECT, BLACK 20FT 1 5
5 103351 BAG, POLY, 10x14.5 1 5
6 123831 BAG 2

15
 PACKAGING PART LIST
(Refer to figure 5)

RoomMate® Computer Monitor

Item Part Number Description Qty See

Number Note
1 136171 CARTON, RSC, RMC, APPLE 1
2 124921 END CAP, FOAM 2
3 129026 PACKING, CREASE SHT, D/C 2
4 140774-1B LIT KIT, RCM, 120V 1
4 136169 OWNER'S MANUAL, APPLE RMC 1 4
4 187981 WARRANTY SERVICE LIST, NEW 1 4
4 141478 BROCHURE, ALL PRODUCTS 1 4
4 181357 INFO CARD, WARRANTY, U.S. 1 4
4 181460 INFO CARD, WARRANTY, MULTI LANG 1 4
4 103351 BAG, POLY, 10x14.5 1 4
4 149470 SHEET, 1 YEAR WARRANTY 1 4
4 149978 SHEET, INFORMATION, SAFETY 1 4
5 140775-DB ACCESSORY KIT, RCM, PLATINUM 1
5 136363 ADAPTOR, PLUG, MONO 1 5
5 128404 ADAPTOR, PLUG, STEREO 1 5
5 130915 CABLE, INTERCONNECT, BLACK 20FT 1 5
5 103351 BAG, POLY, 10x14.5 1 5
6 123831 PLASTIC BAG 1
Note: Optional mini to RCA adaptor, pn 128404
FIXED CABLE ADAPTOR PLUG FOR USE WITH AV28 MEDIA CENTER PART NUMBER 262844

Figure 5. Packaging View

16
Figure 6. PCB Layout

17
 ®

Lifestyle® Powered Speaker System

Video RoomMate®
RoomMate® Computer Monitor

©
1996 Bose Corporation Service Manual
Part Number 143922
 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE

BOSE CORPORATION
THE MOUNTAIN
FRAMINGHAM, MASSACHUSETTS USA 01701
P/N 143922 9/96: REV. 02 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008