Bose® Computer MusicMonitor™
©2007 Bose Corporation
Service Manual
Reference Number 301248-SM Rev. 03
Electronic Copy Only
CONTENTS
Safety Information .............................................................................................................................3
Part List Notes ..................................................................................................................................3
Warranty .............................................................................................................................................4
Product Description .........................................................................................................................4
Repairability.......................................................................................................................................4
Demo Mode .......................................................................................................................................4
Date of Manufacture Information ....................................................................................................4
Serial Number Information ...............................................................................................................4
Specifications.................................................................................................................................... 5
Packaging Part List, Bose
Figure 1. Computer MusicMonitor™ Packaged System .....................................................................6
Listening Test Procedure ................................................................................................................7
Service Manual Revision History ...................................................................................................8
Keep the remote control battery away from children. It may cause a fire or chemical
burn if mishandled. Do not recharge, disassemble, heat above 140°F (60°C), or incin-
®
Computer MusicMonitor™ (see Figure 1) ......................................6
WARNING:
erate.
Dispose of used batteries promptly. Replace only with a battery of the correct type
and model number.
Danger of explosion if remote battery is incorrectly replaced. Replace with only
Duracell, Eveready, Energizer, Maxell, Toshiba or Shun Wo CR2032 or DL2032 3-volt
lithium battery.
CAUTION:
The Bose Computer MusicMonitor™ contains no user-serviceable parts. To prevent
warranty infractions, refer servicing to 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.
2
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 leak-
age current tester or a metering system that complies with American National Standards Institute
(ANSI) C101.1 “Leakage Current for Appliances” and Underwriters Laboratories (UL) UL6500 /
UL60065 / IEC 60065 paragraph 9.1.1. With the unit powered on, measure from a known earth
ground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle
bracket, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any
exposed metal parts that offer an electrical return path to the chassis. Any cur-rent 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 POTEN-
TIAL 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.
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 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. 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.
3
WARRANTY
The Bose® Computer MusicMonitor™ is covered by a 1-year transferrable, limited warranty.
Product Description
The Bose® Computer MusicMonitor™ is a two-piece speaker system about 1/3 the total size of a Companion 2 PC speaker. The Speaker System provides surprisingly deep bass and spaciousness for its size. It is
also an impressively elegant product – not targeting the entry-level pricing of the Companion 2, but rather
targeting a customer looking for an additional “wow” factor. Further differentiating itself, it uses Bose proprietary slotted internal opposing passive radiator technology. The Computer MusicMonitor™ will play bass as
deep as Companion 2, and at a higher maximum SPL than Companion 2.
Repairability
The speaker assemblies are not repairable. Once opened, the gasket used to acoustically seal the assembly will be compromised. Re-using the gasket may cause air leaks or distortion. The gasket will not be
available as a service part, it is recommended to replace the entire assembly when it is defective. Both left
and right speakers are available for replacement. See page 4 for part numbers.
Demo Mode
The Speaker System demo mode enables sales channels to build a highly effective display, in “low sales
touch” environments, with a variable-source input. In demo mode, The Speaker System turns on automatically when power is applied. When the Speaker System turns on in demo mode the volume is automatically
set to maximum.
Entering Demo Mode:
Turn on the Computer MusicMonitor™ Press and hold the volume up button until the volume reaches
maximum and the LED starts to blink. Continue to hold the volume up button (approximately 30 seconds)
until the LED stops blinking, which indicates that the Speaker System has entered demo mode.
Leaving Demo Mode:
Turn on the Computer MusicMonitor™. Press and hold the volume down button until volume reaches
minimum and the LED starts to blink. Continue to hold the volume down button (approximately 30 seconds)
until the LED stops blinking, which indicates that the speakers have left demo mode and returned to normal
behavior. The speakers can only enter and leave demo mode 25 times. When the speakers leave demo
mode for the 50th time, it will not be possible to place that unit back into demo mode. To determine the
speakers are in demo mode, turn them off and back on. Press the volume up button once. If the LED blinks
twice, it is in demo mode. If it blinks once, it is not in demo mode. (If M3.2 is at maximum volume when it is
turned off, then upon turn-on, the volume will be set to maximum in demo mode, but only to the maximum
threshold value if not in demo mode).
Serial Number and Date of Manufacture Information
The date of manufacture (DOM) and the product code are encoded within the serial number located on the
product label.
Serial Number Example - 040274Z62170107AC
The first 6 characters identify the product code - 040274
Characters 8 to 11 identify the DOM - 6217
6217 = the 217th day of 2006
4
SPECIFICATIONS
Mechanical
Dimensions: Individual Speaker: 4.8“ H x 2.5” W x 4.8” D
(12.2 x 6.5 x 12.3 cm)
Weight: Right Speaker: 1.3 lbs (1 kg)
Left Speaker: 1.2 lbs (.8 kg)
Electrical
Power Pack Rating: Input Voltage Range: 100VAC to 240VAC
Input Frequency Range: 50/60 Hz
1.0 Amp (rms) Maximum for 120VAC AC Input Current:
0.5 Amp (rms) Maximum for 230VAC
30 Amp Maximum at 120VAC Maximum In-Rush Current:
60 Amp Maximum at 240VAC
Speaker Inputs: Input Power: 17V DC, 2A
Input Signal: 2.0 Vrms Maximum
Frequency Response: 63Hz to 15KHz
Maximum SPL: 90dB
Watts Per Channel: 18 Watts
Driver Complement: One magnetically shielded 1.96”
(50 mm) full-range driver per speaker
5
PACKAGING PART LIST
Bose® Computer MusicMonitor™
Item Description Bose® Part
Number
Product
Code
Note
1 PACKING, THERMOFORM, TOP 309359 -
2 PASSIVE SPEAKER ASSY, LEFT
*PASSIVE SPEAKER ASSY, LEFT, JAPAN
3 POWERED SPEAKER ASSY, RIGHT
*POWERED SPEAKER ASSY, RIGHT, JAPAN
301482-001
301482-003
301481-001
301481-003
-
-
4 PACKING, THERMOFORM, BOTTOM 309358 -
5 LINE CORD, 120V, US
LINE CORD, 230V, EU
LINE CORD, 230V, UK
LINE CORD, 100V, JAPAN
LINE CORD, 240V, AU
LINE CORD, 230V, SP
LINE CORD, 220V, KOREA
304186-001
304186-002
304186-004
304186-003
304186-005
304186-006
304186-007
- 3
6 POWER SUPPLY, UNIVERSAL, 16V, 2A 302251-001 - 3
7 DEMO DISC 307153-001 -
8 CABLE, INPUT, COMPUTER MUSIC MONITOR
304187-001
-
9 REMOTE CONTROL 307631-004 -
10 GUIDE, OWNERS, M3, 3-LANG, US
GUIDE, OWNERS, M3, 6-LANG, EU
GUIDE, OWNERS, M3, 6-LANG, AP
307625
307626
307627
-
11 CARTON,DC, 9.13 X 7.06X 2 309360 -
12 CARTON, DC 9.75 X 7.25 X 7.81 317310 -
*Japan speakers use a different type of Neodymium magnet
1
2
4
3
5
8
10
6
7
9
11
12
6
LISTENING TEST PROCEDURE
Test Equipment required:
Audio Signal Generator
Test Set up
a. Connect speaker cable from the left speaker to the right speaker.
b. Connect a signal generator to the audio input cable and connect the cable to the input jack on
the right speaker.
c. Connect the power adapter to the power input on the right speaker.
NOTE: For all listening tests (air leak and sweep test), listening should be done at a distance of
2 feet (0.6 meters) in a quiet environment. Listening distance must be decreased to 1 foot (0.3
meters) in a noisy environment. There should be no audible distortion during any test.
The speaker assemblies are not repairable. Once opened, the gasket used to acoustically seal
the assembly will be compromised. Re-using the gasket may cause air leaks or distortion, it is
recommended to replace the entire assembly when it is defective. Both left and right speakers
are available for replacement. See page 4 for part numbers.
1. Air Leak Test
The air leak test is performed just below the loudspeaker’s tuned frequency. At this frequency, the
passive radiators exhibit high excursion. Therefore, it is normal to hear suspension noise from the
passive radiators.
1.1 Apply a 300 mVrms, 60 Hz signal to the input.
1.2 Set the volume to the maximum setting by pressing the volume + button.
1.3 Listen carefully for air leaks from the cabinet seams around the transducer and at the input
terminals.
1.4 Replace system if air leaks can be heard.
2. Sweep test
2.1 Apply a 300 mVrms, 60 Hz signal to the input.
2.2 Set the volume to the maximum setting by pressing the volume + button.
2.3 Listen carefully as you sweep the bass module from 40 Hz to 5 kHz, then from 5 kHz to 40 Hz.
2.4 Listen carefully for buzzes, rattles, or other extraneous noises from the speaker cabinet. A
slight whooshing sound from the port (at approximately 70 Hz) is acceptable.
2.5 Replace system if buzzes or rattles can be heard from the cabinet.
7
SERVICE MANUAL REVISION HISTORY
Date Revision
Level
08/16/07 00 Document released at
11/09/07 01 Part number changes for the
12/18/07 02 Deleted audio cable part
01/09/08 03 Removed Companion 3
Description of Change Change Driven By Pages
revision 00
remote control and DVD
demo disc.
number. Added the
Companion 3 audio cable in
it’s place
audio cable. Replaced it with
the MusicMonitor audio
cable.
Carton part number
changed from 306751
to317310
Affected
Service Manual
release
5
The Computer
MusicMonitor audio
cable is unreliable.
The Companion 3
audio cables
should used until
the quality of the
correct cable is
available.
All MusicMonitor
cable have been
quality tested.
All
5
5
6
8
SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
Bose Corporation
The Mountain
Framingham Massachusetts USA 01701
P/N: 301248-SM Rev. 03 8/2007 (H)
http://serviceops.bose.com
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