Page 1
2
CONTENTS
Safety Information ............................................................................................................................. 3
Warranty............................................................................................................................................. 3
Product Description ..................................................................................................................... 4-7
Specifications ................................................................................................................................ 8-9
Electrostatic Discharge Sensitive (ESDS) Device Handling ..................................................... 10
Part List Notes ................................................................................................................................ 10
Packaging Part List, FreeSpace
® DXA 2120 Amplifier/Mixer (see Figure 1) ............................. 11
Figure 1. FreeSpace DXA 2120 Packaging View ............................................................................11
Main Part List, FreeSpace DXA 2120 Amplifier/Mixer (see Figure 2) ......................................... 12
Figure 2. FreeSpace DXA 2120 Amplifier/Mixer Exploded View ......................................................13
Electrical Part Lists ..................................................................................................................14-52
Control PCB Assembly ............................................................................................................. 14-16
DC24 PCB Assembly ................................................................................................................. 17-18
Digital Signal Processor (DSP) PCB Assembly.....................................................................19-28
Input/Output PCB Assembly .................................................................................................... 29-35
Amplifier PCB Assembly........................................................................................................... 36-40
PSU PCB Assembly ................................................................................................................... 41-44
RCA Input PCB Assembly.........................................................................................................45-49
RS-232 PCB Assembly.................................................................................................................... 50
Speaker PCB Assembly ............................................................................................................ 50-51
Volt PCB Assembly.......................................................................................................................... 52
Figure 3. FreeSpace DXA 2120 Amplifier with Top Cover Removed ...............................................53
Disassembly Procedures .........................................................................................................54-61
Test Procedures.......................................................................................................................62-70
FreeSpace DXA-2120 Firmware Update Procedure ..............................................................71-72
FreeSpace DXA-2120 Wiring Diagram .......................................................................................... 74
Figure 4. DSP and MCU PCB Topside Etch Layout ........................................................................75
Figure 5. DSP and MCU PCB Bottom Etch Layout ........................................................................75
Figure 6. Input/Output PCB Topside Etch Layout ............................................................................76
Figure 7. Input/Output PCB Bottom Etch Layout ............................................................................76
Figure 8. Volt PCB Topside Etch Layout .........................................................................................77
Figure 9. Volt PCB Bottom Etch Layout ..........................................................................................77
Figure 10. Speaker PCB Topside Etch Layout ................................................................................77
Figure 11. Speaker PCB Bottom Etch Layout .................................................................................77
Figure 12. RS232 PCB Topside Etch Layout ..................................................................................77
Figure 13. RS232 PCB Bottom Etch Layout ...................................................................................77
Figure 14. PSU PCB Topside Etch Layout ......................................................................................78
Figure 15. PSU PCB Bottom Etch Layout ......................................................................................78
Figure 16. Amplifier PCB Topside Etch Layout ................................................................................79
Figure 17. Amplifier PCB Bottom Etch Layout ................................................................................79
Figure 18. DC24 PCB Topside Etch Layout ....................................................................................79
Figure 19. DC24 PCB Bottom Etch Layout ....................................................................................79
Figure 20. Control and Display PCB Topside Etch Layout ..............................................................80
Figure 21. Control and Display PCB Bottom Etch Layout ...............................................................80
Figure 22. RCA Input and A/D PCB Topside Etch Layout ................................................................81
Figure 23. RCA Input and A/D PCB Bottom Etch Layout ................................................................81
Integrated Circuit Diagrams ....................................................................................................82-91
Troubleshooting............................................................................................................................. 92
Service Manual Revision History .................................................................................................93
Page 2
3
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)
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 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 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 prod-
ucts, 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.
CAUTION: The Bose ® FreeSpace ® DXA 2120 Digital Mixer/Amplifier
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.
The Bose FreeSpace DXA 2120 Digital Mixer/Amplifier is covered by a limited 2-year transfer-
able limited warranty.
WARRANTY
