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CONTENTS
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 Bose ® Model 2150 amplifier contains no
user-serviceable parts. To prevent warranty infractions,
refer servicing to warranty service stations or factory service. Safety Information ............................................................................................................................. 3
Electrostatic Discharge Sensitive (ESDS) Device Handling ....................................................... 3
Warranty............................................................................................................................................. 3
Specifications................................................................................................................................ 4-5
Amplifier/Driver Board Version Information ................................................................................... 6
Packaging Part List, Model 2150 Amplifier ..................................................................................... 6
Part List Notes .................................................................................................................................. 7
Main Part List, Model 2150 Amplifier (items not shown on a part drawing) ................................ 7
Main Part List (Continued), Model 2150 Amplifier (see Figure 1) ................................................ 8
Figure 1. Model 2150 Amplifier Top Cover Removal Exploded View ....................................................8
Main Part List (Continued), Model 2150 Amplifier (see Figure 2) ................................................ 9
Figure 2. Model 2150 Amplifier Internal Assemblies Exploded View ..................................................10
Main Part List (Continued), Model 2150 Amplifier (see Figure 3) .............................................. 11
Figure 3. Model 2150 Amplifier Module Exploded View ......................................................................11
Electrical Part Lists .................................................................................................................. 12-45
Input Module Assembly ............................................................................................................ 12-14
Barrier PCB Assembly (part of Input Module Assembly) ............................................................ 15
Amplifier PCB Assembly (board part number 6000.0435) ...................................................... 16-20
Amplifier PCB Assembly (board part number 8005.0587) ...................................................... 21-26
Power Supply PCB Assembly .................................................................................................. 27-29
Switch PCB Assembly............................................................................................................... 30-31
AC Input/Output PCB Assembly ..................................................................................................... 32
Interface PCB Assembly ........................................................................................................... 33-34
Digital Signal Processor (DSP) PCB Assembly ..................................................................... 35-43
Display PCB Assembly.............................................................................................................. 44-45
Disassembly Procedures .........................................................................................................46-49
Test Procedures....................................................................................................................... 50-54
Figure 4. Model 2150 amplifier rear panel .........................................................................................50
Figure 5. Test Setup Diagram ...........................................................................................................50
Figure 6. Model 2150 Amplifier Signal Flow Block Diagram ..............................................................55
Theory of Operation ................................................................................................................. 56-65
Circuit Board Layout Diagrams ............................................................................................... 66-73
Integrated Circuit Diagrams ....................................................................................................74-78
Troubleshooting............................................................................................................................. 79
Service Manual Revision History .................................................................................................80
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SAFETY INFORMATION
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.
The Bose ® Model 2150 amplifier is covered by a five-year, transferable, limited warranty.
WARRANTY
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 AC switch first in the ON position and then in
OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all ex-
posed 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 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.
