Service Manual Revision History .................................................................................................93
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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 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.
CAUTION: The Bose® FreeSpace
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.
®
DXA 2120 Digital Mixer/Amplifier
WARRANTY
The Bose FreeSpace DXA 2120 Digital Mixer/Amplifier is covered by a limited 2-year transferable limited warranty.
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Product Description
The Bose® FreeSpace® DXA 2120 Digital
Mixer/Amplifier integrates digital signal
processing with two 120-watt output
channels. Designed as a mixer/router for
business music applications, it features
an LCD panel and control buttons behind the front cover for ready access and easy configuration.
The mixer/amplifier provides six inputs, including 4 Mic/Line inputs, 1 Page input, and 1 Direct
input. The Direct input can override all sources playing on the output channels. Each Mic/Line
input provides both RCA and Euroblock jacks. The Euroblock connectors will accept either a Mic
or Line level input. The RCA jacks accept Line level inputs only.
Two output channels are wired for 120 watts at 4 ohms each. For 70/100 volt applications, a
jumper is required for proper configuration. In 70/100V applications, the two outputs will operate
at 100 watts per channel. A third output is available for an auxiliary line out.
Additional features include:
•Signal Mixing: In Mixer Mode, simultaneously combines up to four inputs for any of the
three outputs.
•Signal Routing: In Dual Mono Select Mode, one or two inputs go to each of two outputs in
different zones and can be remotely selected. Or in Stereo Select Mode, two stereo sources
go to one output zone and can be remotely selected.
•Opti-voice
®
Paging: Provides a smooth transition between music and page signals.
•Dynamic Equalization: Maintains tonal balance at all listening levels.
•Room Equalization: Allows easy adjustment of tonal balance in each zone.
•Communications Port: Includes an RS-232 serial port in reserve for system updates.
•Back-up Power: Provides an input terminal for a +24V DC back-up power source.
POWER
Supplied with the product
Included Connectors:
•3-terminal input connectors (4) for wiring source equipment to 1 - 4 Line/Mic input Euroblock
jacks.
•4-terminal input connectors (2) for wiring to the single Page and single Direct input jacks.
•6-terminal input connector (1) for wiring to interface wall controls to the wall panel input jack.
•3-terminal output connector (1) for wiring to the AUX-out jack.
Included placement aids:
•Non-skid rubber feet (4) for stable placement on a solid, level surface.
•Rack ears (2) with mounting hardware for installation in a rack.
Mixer/Amplifier Accessories
•FreeSpace DXA volume control - A wall-mountable plate with volume control knob that fits
into a standard U.S. double-gang junction.box.
•FreeSpace DXA volume control with A/B select - A wall-mountable plate that fits into a
standard U.S. double-gang junction box. It features volume control and A/B select knobs for
remote source selection.
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Hardware Description
Front panel with open compartment
1
5
6
2
7
System Controls
1 - LCD panel - Displays menu selection for
configuring and viewing system settings.
2 - Directional buttons - Navigate system
menus and setting options as shown on the
LCD.
3 - Select button - Confirms selections and
settings in the system menus.
4 - Power LED - Blue light indicates the
system is on. No light when it is off.
5 - Signal and Clip LEDs - Show signal
states for OUPUT 1, OUTPUT 2, PAGE and
DIRECT.
Signal Unlit = No signal
Clip Unlit = No clipping
Signal Green = Signal present
Clip Red = Clipping
6 - Gain knobs - Adjust gain for OUTPUT 1,
OUTPUT 2 and PAGE.
3
4
8
7 - Bass and Treble knobs - Adjust tonal
balance for OUTPUT 1 and OUTPUT 2.
Control Compartment
8 - Enclosure Door - Conceals system
controls.
Input Controls
9 - SIGNAL and CLIP LEDs - Show signal
states for Inputs 1 - 4.
Signal Unlit = No signal
Clip Unlit = No clipping
Signal Green = Signal present
Clip Red = Clipping
10 - Gain knobs - Adjust gain for INPUT 1 INPUT 4.
9
10
Front panel with compartment closed
1
1Latch location – Provides access to system controls.2Power status window – Reveals Power LED.
2
5
Hardware Description
Rear Panel
1
2
3
4
Audio source inputs
1 - INPUT 1 of 4 - Unbalanced RCA audio
input jack.
2 - MIC/LINE switch - To adjust for the type
if signal input. (Mic connections require
using Euroblock input jacks.)
3 - INPUT 2 of 4 - Balanced Euroblock audio
input jack.
4 - DIRECT INPUT - Balanced override input
jack.
5 - PAGE INPUT - Balanced audio input
jack.
5
14
6
8
7
910
13
Communication
14 - COM - RS-232 serial port for system
updates.
Wall Plates
The FreeSpace
®
DXA 2120 is designed to be
compatible with the following Bose user
interfaces:
•Bose Volume Control User Interface
(PC 041966)
•Bose Volume Control with A/B Select
User Interface (PC 041967)
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Outputs
6 - AUX OUTPUT - Line-level signal output
for other amplified equipment.
7 - OUTPUT 1 of 2 - Speaker connections
for two powered outputs of 70V, 100V or 4
ohms.
Control Input
8 - REMOTE - Input jack for Volume control
and Volume control with A/B select wallplate
user interfaces.
Power
9 - BACKUP POWER - For connection to
backup power source.
10 - POWER ON/OFF - AC power switch
11 - FUSE - 120V T6.3A/250V L or 240V
T3.15A/250 L.
12 - AC mains line cord jack - AC line
voltage input.
13 - 120V/220-240V switch - Switches
between 120V and 220-240V AC input
voltage. This switch is not provided on 100V
AC input voltage models.
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System Setup
This section provides instructions on setting
the system for preferred operation. To make
these settings, the system must be connected to power and the AC POWER switch
set to ON.
Rear connection panel
POWER
switch
Front control compartment
AC power cord
jack
• When the system is unlocked, you can
navigate to system setup options.
• Use the arrow and SELECT buttons to
move through the menus and change
settings for the equipment used and the
type of connections made in your instal lation.
• Notice the type of setting in each field:
- Level changes (designated by Lvl) are
made using the GAIN knobs only. These
levels appear in the menu field, but
cannot be changed in the menu.
- Adjustments (designated by Adj) are
made in the menu. To do so:
1. Activate the field by pressing SELECT.
2. Using the up or down arrow, adjust the
value.
3. Press SELECT to confirm the setting
and move on.
Selecting an operation mode
POWER
LED
Note: When the system is unplugged, or if a
power loss occurs, these system settings
are retained in flash memory. However,
continuous system operation during a power
loss requires the use of an optional backup
power source.
System Setup Procedure
When first turned on, pressing any button
next to the LCD activates the display.
Front control panel
Arrow
buttons
SELECT button
• If the system is locked, simultaneously
press the left and right arrow buttons and
hold for five seconds. Lockout Off appears.
Arrow buttons to
the right of the
LCD move forward,
back, up, and down
through menus.
An asterisk (*) marks
the selection made.
Some of the setting menus available for
selections depend on the mode of operation
you choose.
Pressing the right arrow button brings up the
initial selection menu so you can chose the
mode you need:
• Mixer mode: The system can mix up to
four mic/line inputs to each of the two output
channels for use in one or two zones.
• Stereo Select mode: With up to two
stereo sources connected and using both
output channels, the system provides stereo
sound to a single output zone.
• Dual Mono Select mode: With two input
souces connected to each of the two output
channnels, the system provides audio in two
zones.
• Utility - Includes system lockout and an
option to restore all settings to the factory
defaults.
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Specifications
Audio Inputs
Mic Inputs (4 - Balanced):Connectors:3-pin Euroblock
A/D and D/A Converters:24-bit
Communication Port:RS-232 serial port
LED Status Indicators:Power - blue; Signal present - green; Clip - red
Power
Mains Voltage:100 to 240VAC; 50 to 60Hz
AC Power Consumption:Idle:39W
Active: 350W
Fuse Type:120V T6.3A/250 or 240V T3.15A/250 L
DC Backup Power:+24V (+/- 1%)
Connector:2-terminal barrier strip
Input Voltage Level:+24V
Minimum Input Power:50W
Maximum Output Power:150W
Mechanical
Dimensions:3.5” H x 16.63” W x 13.5” D (8.9 x 42.2 x 34.3 cm)
Weight:Unpackaged:31.8 lbs
Shipping weight:39.9 lbs
Environmental
Operating Temperature:0 - 40 degrees C
Storage Temperature:-40 - 70 degrees C
Humidity:40 - 90%
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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.
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.
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PACKAGING PART LIST
FreeSp ace® DXA 2120 Amplifier/Mixer (see Figure 1)
FreeSp ace® DXA 2120 Amplifier/Mixer (see Figure 2)
Item
Number
1 TOP COVER, CHA S SIS 1405-8601+0 298 705 1
2 DSP/MCU PCB ASSEMBLY SVC-MIXER14+DSP 298689 1 2
3 BRACKET FOR DSP PCB 4135-6371+0 - 1 4
4 POWER SUPPLY PCB ASSY SVC-MIXER14+PSU 298690 1 2
5 FUSE HOLDER 4153-1100+0 - 1 3,4
6 AC JACK, I EC POWER 2113-3050+0 - 1 3 ,4
7 SHIELD P LA TE, RCA JACK 1454-2 530+ 0 - 1 4
8 I/O PCB ASS EMBLY SVC-M IXE R14+ I/O 298701 1 2
9 RCA IN/A-D BUFF PCB ASSY
( PAR T OF ITEM 8 ABOVE)
10 CHASSIS 1405-8704+0 - 1 4
11 RS-232 PC B ASSEMB LY SV C- M IXE R14+ 232 298702 1 2
12 RACK EAR 4135-6291+0 298706 2
13 SPEAKER PCB ASSEMBLY SVC-MIXER14+SPK 298700 1 2
14 AC VOL T SELECT PCB ASS Y SVC-MIXE R14+ V OLT 298699 1 2
15 FRONT PANEL CONTROL
AND DISPLAY PCB ASSY
16 FRONT PANEL, CHASSIS 1405-9502+0 - 1
17 LIGHT PIPE 4155-1861+0 298517 9
18 FRONT PANEL, FIXED SIDE
WITH END CA P
19 FRONT PANEL, ALUM, RT 1405-8901+0 - 1
20 KNOB, INPUT VOLUME
(INCLUDES ALL 4 KNOBS)
21 DOOR ASSEMBLY SVC-MIXER14+DOOR 298682 1
22 M AGNET , DOOR ASSY 4110-0001+0 2 4
23 END CAP, F RON T PANEL,
LE FT SIDE
24 FRONT PANEL, LEFT 1467-6301+0 - 1
25 SPRING PLATE 4135-6381+0 - 2
26 COVER FOR SPRING 4155-1911+0 - 2
27 KNOB, PUSH 2447-3201+0 - 1
28 AC INP UT XFMR (120/240V) 1806-3927+0 298 698 1 3
28 AC INP UT XFMR (100V ) 1806- 3928+0 301 561 1 3
29 24V BACKUP P/S PCB ASSY SVC-MIXE R14+DC24 298693 1 2
30 HEAT S INK FO R DC- DC P CB 5400- 9761+0 - 1 4
31 BRACKET, FAN GUIDE 4135- 6281+0 - 1 4
32 OUTPUT XFMR, CV, 70/100V 1806-3943+0 298697 2 3
Description
endo r Part Number Bose®
Part
Number
SVC-MIXER14+RCA - 1 2
SVC-MIXER14+CTRL 298685 1 2
SVC-MIXER14+CAP 298683 1
SV
-MIXER14+KNOB 328113001S
1467-6401+0 298681 1
Qty. Note
4
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MAIN PART LIST
V
FreeSp ace® DXA 2120 Amplifier/Mixer (see Figure 2)
Item
Number
33 BRACKET C FO R HE A T SINK 4135-6361+0 - 1 4
34 HEATSINK 5400-9721+0 - 1 4
35 AMPLIFIER PCB ASSEMBLY SVC-MIXER14+AMP 298695 1 2
36 BR ACKET B FOR HEAT SINK 4135-6261+0 - 1 4
37 BR ACKET A FOR HEAT SINK 4135-6251+0 - 1 4
38 FAN, DC, 24V, 2400 RP M 8913-0005+0 298703 1 3
39 AC POWER SWITCH 5200-4942+0 - 1 3,4
- RIBBON CABLE 7012-7870+0 298688 3
- LCD DISPLAY 8902-0005+0 298686 1
- F USE T6.3A 250V 5X20 UL
(120V UNITS)
FUSE T3.15A 250V 5X20MM
UR & SE MKO (220-240V)