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
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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)
Figure 3. FreeSpace DXA-2120 Amplifier with Top Cover Removed
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DISASSEMBLY PROCEDURES
1. Top Cover Removal
1.1 Using a Phillips-head screwdriver,
remove the eight screws that secure the top
cover to the chassis. Lift off the top cover.
2. Digital Signal Processor (DSP)
PCB Removal
2.1 Perform procedure 1.
2.2 Unplug the three ribbon cables from the
front of the board at connectors CN08B,
CN09B and CN07B.
2.3 Unplug the wiring harnesses at connectors CN13B, CN11B, CN10B, CN14B,
CN06B, CN05B, CN04B, CN03B, CN02B,
CN01B and CN12B.
2.4 Using a Phillips-head screwdriver,
remove the five screws that secure the
board to the chassis. Lift out the board.
3. Power Supply (PSU) PCB Removal
3.1 Perform procedure 2.
3.2 Unplug the two blue wires from connec-
tors JP601 and JP603. Disconnect the black
wire from connector JP602.
3.3 Unplug the wiring harnesses from connectors CN16B, CN17B and CN601.
Re-assembly Note: Be sure to connect the
correct wiring harness to the correct connectors at CN16B and CN601. Both connectors
are identical and damage to the unit could
result if they are plugged into the wrong
connector.
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DISASSEMBLY PROCEDURES
3.4 Unplug the wiring harnesses at CN15A,
the fan connector and the NTC TH611.
3.5 Unplug the red, black and blue wires
from JP604A, JP605A and JP606A.
3.6 Located in the middle of the four large
electrolytic capacitors are three wires that
are soldered to the board, two black and
one green. Follow these wires over to the
SPKR PCB. Make a note of where they are
connected to the board and unplug them.
3.7 Using a Phillips-head screwdriver,
remove the five screws that secure the PSU
PCB to the chassis. Lift out the PCB.
4. Amplifier PCB Removal
4.1 Perform procedure 1.
4.2 Unplug the Red, Blue and Black Faston
connectors from the amplifier PCB. These
wires run up from the PSU PCB, located
under the DSP board.
4.3 Unplug the audio input cable from the
DSP PCB at CN06B. Unplug the wiring
harness from connector CN501.
4.4 At the other end of the board, follow the
red and blue wires to the SPKR PCB. Make
a note of where they are connected and
unplug these wires from the board.
4.5 Using a Phillips-head screwdriver,
remove the eight screws that secure the
output transistors to the heatsink.
4.6 Remove the three screws that secure
Q515, Q516 and thermistor TH611 to the
heatsink.
Reassembly Note: Be sure to retain the
transistor and thermistor retaining clips as
well as the mica insulators for re-use.
4.7 Remove the four screws that secure the
amplifier PCB to the heatsink. Lift off the
PCB.
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DISASSEMBLY PROCEDURES
5. Fan Removal
5.1 Perform procedure 1.
5.2 Unplug the Red, Blue and Black Faston
connectors from the amplifier PCB. These
wires run up from the PSU PCB.
5.3 Unplug the audio input cable from the
DSP PCB at CN06B.
5.4 Remove the two screws that retain the
DSP board support bracket. Remove the
seven screws that secure the heatsink
assembly to the chassis. Lift out the heatsink
assembly.
5.5 Unplug the fan wiring harness from the
PSU PCB.
5.6 Remove the four screws that secure the
fan to the chassis. Make a note of which
direction the fan is mounted into the chassis
and lift it out.
Re-assembly Note: Be sure to re-install the
fan facing the correct direction for proper
airflow. Air should flow into the sides of the
chassis and out the opening in the back.
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DISASSEMBLY PROCEDURES
6. Input/Output PCB and RCA Input/AD
Buffer PCB Removal
6.1 Perform procedure 2.
6.2 Remove the eight screws that secure the
Input/Output-RCA Input/AD Buffer PCB
assembly to the back of the chassis. Lift out
the PCB assembly.
Take care to not lose the plastic insulators or
the copper decoupling capacitor yokes
located over the RCA jacks during disassembly.
6.3 Remove the two screws that secure the
RCA Input/AD Buffer PCB to the Input/
Output PCB. Lift off the RCA Input/AD Buffer
PCB.
7. SPKR PCB Removal
7.1 Perform procedure 1.
7.2 Unplug the wiring harness from the DSP
PCB at CN13B.
7.3 Make a note of the wiring configuration
and unplug all of the Faston connectors
from the back of the PCB.
Re-assembly Note: Using the note above,
be sure that all wires are connected to the
correct locations on the SPKR PCB.
7.4 Remove the six screws that secure the
SPKR PCB to the chassis. Lift out the PCB.
8. RS-232 PCB Removal
8.1 Perform procedure 1.
8.2 Unplug the wiring harness from the DSP
PCB at connector CN10B.
8.3 Remove the two jackscrews located on
either side of the DB-9 connector. Remove
the two screws located on either side of the
jackscrew locations. Lift out the PCB.
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DISASSEMBLY PROCEDURES
9. Voltage Select Switch PCB Removal
9.1 Perform procedure 1.
9.2 Make a note of the wiring configuration
and unplug all of the Faston connectors
from the back of the PCB.
Re-assembly Note: Using the note above,
be sure that all wires are connected to the
correct locations on the PCB.
9.3 Remove the two screws that secure the
PCB to the back of the chassis.
9.4 Lift out the PCB.
10. DC24 Power Supply PCB Removal
10.1 Perform procedure 1.
10.2 Unplug the red wire from the back of
the power switch. Unplug the black wire
from the SPKR PCB.
10.3 Unplug the DC24 PCB wiring harness
from the PSU PCB at connectors CN16B
and CN17B.
10.4 Remove the four screws that secure
the DC24 PCB to the chassis. Lift out the
PCB.
11. CTRL PCB Removal
11.1 Perform procedure 1.
11.2 Unplug the three ribbon cables from the
DSP PCB at connectors CN08B, CN09B and
CN07B.
11.3 Turn the chassis over top down. Remove the five screws located at the front of
the chassis.
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DISASSEMBLY PROCEDURES
11.4 Turn the chassis back over onto its
bottom. Remove the two screws located on
either side of the chassis side rails near the
front panel.
11.5 Slide off the front panel assembly.
11.6 On the front panel, pull off the four
knobs for inputs 1 - 4.
11.7 Remove the ten screws that secure the
CTRL PCB to the front panel. Lift off the
PCB.
12. Door and Front Panel Removal
12.1 Perform procedure 11.
12.2 Remove the two screws that secure the
left front panel end cap to the front panel
chassis section.
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DISASSEMBLY PROCEDURES
Slide off the end cap to the left. Slide the
door to the left off of the main section of the
front panel plastic.
12.3 Remove the four screws that secure
the main section of the front panel plastic to
the front panel chassis section. Lift off the
front panel plastic.
13. Front Panel Button Assembly Removal
13.1 Perform procedure 11.
13.2 Remove the three screws that secure
the front panel button assembly to the front
panel chassis section. Lift off the button
assembly.
14. AC Power Transformer Removal
14.1 Perform procedure 1.
14.2 Unplug the transformer seconday
wiring harness from the PSU PCB at connectors JP601, JP602, JP603 and CN601.
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DISASSEMBLY PROCEDURES
14.3 Make a note of the wiring configuration
and unplug the transfromer primary connections from the Voltage Select Switch PCB
located at the back of the chassis.
Re-assembly Note: You can refer to the
VOLT PCB board layout diagram for connection information as well.
14.4 Remove the four nuts that secure the
power transformer to the chassis.
Lift out the transformer.
15. 70/100V Transformer Removal
15.1 Perform procedure 1.
15.2 Make a note of the wiring configuration
and unplug the transformer connections
from the SPKR PCB, which is located at the
back of the chassis.
15.3 Remove the two nuts that secure the
power transformer to the chassis. Lift out the
transformer.
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TEST PROCEDURES
Test Setup
AC power must be applied to the product variants as follows:
• DXA 2120 amplifiers with part number 294962-1, use 120VAC (+10/-1%), 60Hz
• DXA 2120 amplifiers with part numbers 294962-2, -4, and -5, use 240VAC (+10/-1%), 50Hz
• DXA 2120 amplifiers with part number 294962-3, use 100VAC (+10/-1%), 50Hz
Required Test Equipment
• Audio Signal Generator
• Oscilloscope
• Distortion Meter
• DC Power Supply capable of a 30V @ 2A output level
• Qty 2 - DXA-2120 Wallplates, PC: 041967
Test Conditions
• All AC audio measurements must be band limited from 22Hz to 22kHz
• All balanced line inputs must be terminated with 50 ohms
• All balanced mic inputs must be terminated with 150 ohms
• Line level output must be terminated with 400 ohms
• All amplifier outputs must be terminated with appropriate resistor values. See below.
Output Name Load Required Note
4 Ohm Output 4 Ohms @ 200W
70.7 Volt Output 49 Ohms @ 100W Jumper must be installed between
4 Ohm and Xfmr In
100 Volt Output 98 Ohms @ 100W Jumper must be installed between
4 Ohm and Xfmr In
Standard test control positions
Set the unit under test controls to the positions listed in the table below.
Control Name Reference Designator Default Setting
Input 1 Trim VR401 Pot Fully CCW
Input 2 Trim VR402 Pot Fully CCW
Input 3 Trim VR403 Pot Fully CCW
Input 3 Trim VR404 Pot Fully CCW
Output 1 T rim VR405 Pot Fully CCW
Output 2 T rim VR406 Pot Fully CCW
Output 1 Treb VR409 Pot Centered (0dB)
Output 2 Treb VR411 Pot Centered (0dB)
Output 1 Ba ss VR408 Pot Centered (0dB)
Output 2 Ba ss VR410 Pot Centered (0dB)
Page Input Trim VR407 Pot Fully CCW
Input 1 Mic/Line Switch SW101 switch Line
Input 2 Mic/Line Switch SW102 switch Line
Input 3 Mic/Line Switch SW103 switch Line
Input 4 Mic/Line Switch SW104 switch Line
Power Switch Off
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TEST PROCEDURES
Electrical Connections
Main Input Connectors
Name Connecti on Description Connector Type
J101 Unbalanced, summed mono line level only Dual RCA
J102 Unbalanced, summed mono line level only Dual RCA
J103 Unbalanced, summed mono line level only Dual RCA
J104 Unbalanced, summed mono line level only Dual RCA
J111 Balanced, mono mic/line level 3-pin EuroBlock
J112 Balanced, mono mic/line level 3-pin EuroBlock
J113 Balanced, mono mic/line level 3-pin EuroBlock
J114 Balanced, mono mic/line level 3-pin EuroBlock
J116 Balanced with Contact closure 4-pin EuroBlock
J115 Balanced with Contact closure 4-pin EuroBlock
The DXA 2120 contains an RS232 serial I/O port via the DB9F connector located on the rear
panel. This connector is not needed for these tests but will be verified during the code loading
process. The port will be configured automatically during test with the following settings:
Baud Rate:56 K
Data Bits:8 bits
Parity:none
Stop Bits:2
Note: This port is intended for direct connection to a PC’s Com Port
1. Idle Current Test
1.1 Turn on the DXA 2120 amplifier assembly and verify the idle current as follows:
Part Number Country AC Input Max Current
294962-1 US/Canada 120 VAC/60 Hz 500 mA
294962-2, -4, -5 Euro/Aus/UK/Sing 240 VAC/50 Hz 500 mA
294962-3 Japan 100 VAC/50 Hz 500 mA
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Page 64
TEST PROCEDURES
DSP, LCD and LED Tests
The functional tests will be performed by first putting the unit under test into one of two test
modes. This puts the unit into a predetermined state so that the outputs can be predicted.
The below items will be verified during the following tests:
•6 Audio Inputs
•3 Audio Outputs
•Volume Control
•LED On/Off
•LCD Display
•LCD Key Operation
•Knob Control
•I/O Signal Detecting
Test mode
Before powering on the unit, press and hold the LEFT and SELECT keys. Turn on the AC
power at the ON/OFF switch located on the rear panel. After about 2.5 seconds, the Pre/Clip
LED’s and LCD display will blink four times and the output relays will switch on/off four times.
At this time the unit will be in test mode. You can now release the LEFT and SELECT keys.
2. LCD Display Tests
2.1 LCD Display Line 1 Tests. Place the unit into Test Mode using the instructions above.
Perform the keypresses listed below and verify that you get the correct information on the
display. Refer to the table below.
Display on Line 1, LCD (2 lines x16 characters)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1~6,
In
1
U D L R S P D 1 2 D
2
1:U — Up key pressedNo display — Up key not pressed
2:D — Down key pressedNo display — Down key not pressed
3:L — Left key pressedNo display — Left key not pressed
4:R — Right key pressedNo display — Right key not pressed
5:S — Select key pressedNo display — Select key not pressed
6:P — PTT TriggeredNo display — PTT not Triggered
7:D – Direct - In TriggeredNo display — Direct - In not Triggered
8:1 — Xfmr Input1 TriggeredNo display — Xfmr Input1 not Triggered
9:2 — Xfmr Input2 TriggeredNo display — Xfmr Input2 not Triggered
10:D — DC Power SuppliedA — AC Power Supplied
1 1:No display
12:No display
13:No display
Gain,
Right
Key
1~4,
Out En ,
Sel Key
1~6,
Input
Sel,
Up
Key
64
Page 65
TEST PROCEDURES
2.2 Verify that you can make the following changes to the unit’s setup by pressing the RIGHT,
SELECT and UP keys respectively: You should be able to set the input gain, enable/mute the
outputs, and select the inputs. Repeat pressing the same key to get back to the original state.
2.2.1 Input Gain Setting
1 2 3 4 5 6
-10 dB -20 dB -30 dB -40 dB -50 dB Mute
2.2.2 Output Enable/Mute
1 2 3 4
Out1
Out2
Aux
2.2.3 Input Select
1 2 3 4 5 6
Out1
Out2
Aux
On Mute Mute On
Mute On Mute On
Mute Mute On On
Input 1 Input 2 Input 3 Input 4 Page In Direct In
Input 1 Input 2 Input 3 Input 4 Page In Direct In
Input 1 Input 2 Input 3 Input 4 Page In Direct In
2.3 LCD Display Line 2 tests
With the unit under test in test mode, rotate the controls listed in the tables below and verify
that you get the correct information on line 2 of the display, i.e. that the values on the screen
go from 00 to FF for Input Knob 1.
Display on Line 2, LCD (2 lines x16 characters)
Because the knob values (00~FF) and the Version ID for the DSP software cannot be displayed
on one line, this information is organized into 4 groups: A, B, C, and D. Only one group at a
time can be displayed on line 2 of the LCD display. At the end of the line the letter A, B, C or D
indicates which group of information is being displayed. You can switch between groups by
pressing the DOWN key on the front panel. See the format for line 2 in the tables below:
Group A
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1
Input 1
2
Knob
(00~FF)
Group B
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1
Output 1
2
Vol Knob
(00~FF)
Input 2
Knob
(00~FF)
Output 2
Vol
Knob
(00~FF)
Input 3
Knob
(00~FF)
Output
1
Bass
Knob
(00~FF)
Input 4
Knob
(00~FF)
Output
1
Treb
Knob
(00~FF)
Page In
Knob
(00~FF)
Output
2
Bass
Knob
(00~FF)
A
B
65
Page 66
TEST PROCEDURES
Connect two wallplates, product code 041967, as listed in the Electrical Connections section of
the Test Setup. Rotating the knobs will scan through the values stated in Group C of the LCD
panel tests as listed in the table below.
Group C
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1
Output 2
Treb
2
Knob
(00~FF)
Group D
1 2 3 4 5~15 16
1
P -- Amp
Protected,
2
No Display -Amp Not
Protected
2.4 LCD and Pre/Clip LED Test
WP1
Knob
(00~FF)
1--WP1 Ctr
On,
0-- WP1 Ctr
Off
WP2
Knob
(00~FF)
1--WP2 Ctr
On
0--WP2 Ctr
Off
Version ID
(6 Number, for example:
060728)
P -- Power is
Down,
No Display --
Power Not
Down
C
(reserved) D
2.4.1 After entering the Test mode, the LCD will display what is shown above. In order to see
whether there is a bad pixel on LCD and whether the LED’s are working OK, press the LEFT
key. The LCD will display black blocks on the full screen and all Pre/Clip LED’s will be lit. This
state cannot be changed until you perform the following: Press the LEFT key, and the LCD will
clear the display and the LED’s will turn off. This state also cannot be changed by itself. Press
the LEFT key again, and the LCD will come back to the original test screen and the LED’s will
again start to cycle through, turning on one at a time in a rotating fashion.
3. Signal Tests
Test Mode for Signal Tests. Before powering on the unit, press and hold the Right and Select
keys. Turn on the AC power at the ON/OFF switch located on the rear panel. After about 2.5
seconds, the Pre/Clip LED’s and LCD display will blink four times and the output relays will
switch on/off four times. At this time the unit will be in test mode, and you can stop pressing the
two keys.
While in test mode, the default conditions will be:
•Input gains will be set to -10 dB
•Input 1 will be routed to all outputs
•All outputs will be on
For each input listed in the following tests, apply the input signal as specified, and verify the
corresponding output signal.
Note: Be sure to connect the correct load resistor values for each of the 4 Ohm, 70V and 100V
outputs.
66
Page 67
TEST PROCEDURES
3.1 Line inputs (J111-J114) with MIC/LINE switch in LINE position
Input signal0 dBV (1V) @ 1KHz sine wave
Output level
With an appropriate power supply (i.e. 30V @ 2A) connected to the battery back up terminals
disconnect the A.C. power cord and insure that the amplifier does not shut down. Also observe
that the “A” in space 10 of line 1 on the LCD changes to a “D”. Reconnect the A.C. power cord
and continue testing the amplifier.
3.11 Output Noise
With all inputs terminated and undriven, measure the following:
Apply a 1 kHz, -50dBV input to the page input. Hold the Page In pin 4 open and verify that no
signal is present at Out1, Out2, and Auxout. Tie Page In pin 4 to pin 3, and verify the following:
The amplifier control knobs and switches should be set to the default positions as stated in the
table below. The amplifier’s DSP settings should be reset to their default conditions through the
utility menu on the front display. If firmware has been reloaded as part of this test procedure
then the reset step can be skipped.
Standard test control positions
Control Name Reference Designator Default Setting
Input 1 Trim VR401 Pot Fully CCW
Input 2 Trim VR402 Pot Fully CCW
Input 3 Trim VR403 Pot Fully CCW
Input 3 Trim VR404 Pot Fully CCW
Output 1 Trim VR405 Pot Fully CCW
Output 2 Trim VR406 Pot Fully CCW
Output 1 Treb VR409 Pot Centered (0dB)
Output 2 Treb VR411 Pot Centered (0dB)
Output 1 Bass VR408 Pot Centered (0dB)
Output 2 Bass VR410 Pot Centered (0dB)
Page Input Trim VR407 Pot Fully CCW
Input 1 Mic/Line Switch SW 101 switch Line
Input 2 Mic/Line Switch SW 102 switch Line
Input 3 Mic/Line Switch SW 103 switch Line
Input 4 Mic/Line Switch SW 104 switch Line
Power Switch Off
70
Page 71
FreeSpace® DXA-2120 Firmware Update Procedure
This procedure will update the firmware located on the FreeSp ace DXA-2120 DSP PCB to the
latest revision.
In order to update the firmware on the chassis, there are two separate files that need to be
updated. One is the BMixerDSP firmware file and the other is an MixerSpkrEQPreset file.
Both are .bin files.
Initial Setup:
•Download the firmware update tool from the Bose Professional Products web site at
http://www.pro.bose.com. After downloading the self extracting .exe update file to your desktop,
double-click the file to extract the update tool and the update files. All of the necessary files will
be placed in a directory called C:\Program Files\Bose\Bose FreeSpace DXA 2120 Update Tool
v1.0. This folder will contain the Update tool, Revision history, EQ list, download instructions,
firmware and eq files, and regcon folder.
Note: If the update tool fails to run you may need to register the MSCOMM32.ocx file. Simply
open the regcon folder, double click on the RegistControl.exe icon and click the Register button.
•Connect the serial cable to the DB-9 connector located on the rear panel of the amplifier.
Connect the other end of the cable to an active COM port on your IBM compatible PC.
Update Procedure:
1. Start the Update Tool by double-clicking the icon.
5. Click “Mixer Update” then you will see the Update dialog.
6. Enable Software Update, select
BMixerDSP bin file and click Begin Update
button, then the user will see a prompt
“Warning:...This will erase…. “. Click OK.
7. The system firmware process will start.
First it will erase the memory, then it will
write the file to memory, and then it will
verify the memory.
8. Finally the program will prompt user to
power cycle the amplifier.
9. You may need to restablish the com port
at this point by pressing the “Open Port”
button.
10. Using the same procdure as in step 6
enable the EQ preset, select the correct BoseSpkrEQPreset.bin file and begin the EQ update.
You will see the same warning prompt as before. Click “OK” to continue.
11. When the update is complete the program will prompt the user to power cycle the amplifier
again. At this point the upgrade is complete. Exit update program if no further update is required.
120IO-YMcASP0 Serial Data 5 or SPI1 Slave Chip Select
126IO-Y
127IO-Y
105IO-YSPI0 Enable (Ready) or I2C1 Serial Data
25PWR-NOscillator 1.2-V VDDtap point (for filter only)
22PWR-NOscillator VSStap point (for filter only)
14I-NDevice reset pin
21IIPDNTest Reset
32IOIPUNEmulation Pin 0
34IOIPUNEmulation Pin 1
(1)
SPI0, I2C0, and I2C1 Serial Port Pins
(2)
PULL
GPIO
Clocks
Device Reset
Emulation/JTAG Port
Power Pins
(3)
DESCRIPTION
TMS320D707RFP/S DSP Pin Function Table (continued)
84
Page 85
Integrated Circuit Diagrams
1
2
1
2
-
+
3
45
-
+
1. Output1
8
2. Inverting input1
3. Non-inverting input
7
4. -Vcc
5. Non-inverting input
6
6. Inverting input 2
7. Output 2
8. +Vcc
LM393 Dual Voltage Comparator
Pin Assignments
Pin Descriptions
Pin NamesDescription
A
n
OE
n
O
n
Truth Table
InputsOutput
OE
n
LLL
LHH
HXZ
H HIGH Voltage LevelZ High Impedance
L
LOW Voltage LevelX Immaterial
Inputs
Output Enable Inputs
Outputs
A
n
6N137
8
1
PackagSe
chematic
N/C
1
+
2
V
F
_
3
N/C
45
V
8
CC
V
7
E
V
6
O
GND
Truth Table (Positive Logic)
tuptuO elbanE tupnI
L H H
H H L
H L H
H L L
O
n
6N137 Optocoupler
L CN H
H CN L
74LCX125M CMOS Quad Bus Buffer
TOP VIEW
V
1
DS
2
D0
3
D1
4
D2
5
D3
6
CE
CP
7
GND
8
TRUTH TABLE
MASTER
RESET
H= High Voltage Level
L= Low Voltage Level
X= Don’t Care
? = Transition from Low to High Level
a...h = The level of steady-state input at inputs D0 thru D7, respectively.
Q00, Q10, Q70 = The level of Q0, Q1, or Q7, respectively, before the indicated steady-state input conditions were established.
Q0n, Q6n = The level of Q0 or Q6, respectively, before the most recent ? transition of the clock.
PARALLEL
ENABLE
LXXXXXLLL
HXLLXXQ00Q10Q0
HLL ?Xa...habh
HHL ?HXHQ0nQ6n
HHL ?LXLQ0nQ6n
HXH?XXQ00Q10Q70
16
CC
PE
15
14
D7
13
Q7
12
D6
11
D5
10
D4
9
MR
INPUTS
CLOCK
ENABLECLOCKSERIAL
Functional Diagram
D0 D1 D2 D3 D4 D5 D6 D7
PE
D
S
CP
CE
MR
PARALLEL
D0 D7Q0Q1
PARALLEL ENABLE CIRCUIT
D0D7
8 - REGISTERS
INTERNAL
Q STATES
Q7
OUTPUT
Q7
74HC166 8-bit Shift Register
85
Page 86
Integrated Circuit Diagrams
COMMON
INPUT/OUTPUT
GND
Pinout Diagram
8-lead SOIC
1
A0
2
A1
3
A2
GND
4
S
S
I
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
0
1
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
VCC
8
WP
7
SCL
6
SDA
5
Functional Diagram
I
24
V
CC
23
I
8
22
I
9
21
I
10
20
I
11
19
I
12
18
I
13
17
I
14
16
I
15
15
E
S
14
2
13
S
3
S
S
S
S
10
0
11
1
14
2
13
3
E
BINARY
1 OF 16
DECODER
= 5 STAGES
S
N
E = 4 STAGES
15
14 - OUTPUT CIRCUITS
SAME AS ABOVE
(WITH ANALOG INPUTS)
TO I
I
1
0
9
PN
14
PN
16
I
15
74HC4067M96 16-Channel Demultiplexer
Pin Configuration
Pin NameFunction
A0 - A2Address Inputs
SDASerial Data
SCLSerial Clock Input
WPWrite Protect
NCNo Connect
GNDGround
VCCPower Supply
Block Diagram
1
COMMON
INPUT/
OUTPUT
TRUTH TABLE
S0S1S2S3E
XXXX1 None
00000 0
10000 1
01000 2
11000 3
00100 4
10100 5
01100 6
11100 7
00010 8
10010 9
01010 10
11010 11
00110 12
10110 13
01110 14
11110 15
H= High Level
L= Low Level
X= Don’t Care
SELECTED
CHANNEL
Pin Descriptions
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each
EEPROM device and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is
open-drain driven and may be wire-ORed with any number of other open-drain or opencollector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device
address inputs.
The AT24C04 uses the A2 and A1 inputs for hard wire addressing and
a total of four 4Kdevices may be addressed on a single bus system. The A0 pin is a
no connect.
WRITE PROTECT (WP): The AT24C01A/02/04/08A/16A has a Write Protect pin that
provides hardware data protection. The Write Protect pin allows normal Read/Write
operations when connected to ground (GND). When the Write Protect pin is connected
to V
(see Product Selector Guide for speed
options and voltage supply tolerances)
V
SS
=Device ground
NC=Pin not connected internally
Logic Symbol
18
A0–A17
DQ0–DQ15
CE#
OE#
WE#
RESET#
BYTE#RY/BY#
16 or 8
(A-1)
(TOP VIEW)
1
20
19
18
17
16
15
14
13
12
11
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
CC
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
2
3
4
5
6
7
8
9
10
function table
INPUTS
OEDIR
LLB data to A bus
LHA data to B bus
HXIsolation
OPERATION
S29AL004D-90TF102 4M Flash
logic diagram (positive logic)
1
DIR
19
2
A1
18
To Seven Other Channels
terminal assignments
1234
AA1
BA3B2A2B1
CA5A4B4B3
DA7B6A6B5
EGNDA8B8B7
DIRV
CC
OE
OE
B1
LT1587CM
FRONT VIEW
3
2
1
LT1587CM Regulator
V
IN
V
OUT
ADJ
SN74L V245ADWR Octal B Transceiver
90
Page 91
Integrated Circuit Diagrams
(TOP VIEW)
1IN+
1IN−
FEEDBACK
DTC
CT
RT
GND
C1
1
2
3
4
5
6
7
8
2IN+
16
2IN−
15
REF
14
13
OUTPUT CTRL
12
V
CC
11
C2
10
E2
9
E1
FUNCTIONAL BLOCK DIAGRAM
6
DTC
1IN+
1IN−
2IN+
2IN−
FEEDBACK
RT
5
CT
≈0.1 V
4
1
2
16
15
3
Oscillator
Dead-Time Control
0.7 V
Error Amplifier 1
+
−
Error Amplifier 2
+
−
Comparator
Comparator
0.7 mA
PWM
TL494CN PWM Controller
1D
C1
Pulse-Steering
Flip-Flop
Reference
Regulator
OUTPUT CTRL
(see Function T
13
able)
Q1
8
C1
9
E1
Q2
11
C2
10
E2
12
V
CC
14
REF
7
GND
(TOP VIEW)
SENSE1
SENSE2
SENSE3
GND
1
2
3
4
8
7
6
5
V
DD
MR
RESET
RESET
Terminal Functions
TERMINAL
NAMENO.
O/I
GND4Ground
MR
RESET
7IManual reset
5OActive-low reset output
RESET6OActive-high reset output
SENSE11ISense voltage input 1
SENSE22ISense voltage input 2
SENSE33ISense voltage input 3
V
DD
8Supply voltage
TOP VIEW
C1+
1
V+
2
C1-
3
C2+
C2-
T2
OUT
R2
MAX220
4
MAX232
5
MAX232A
V-
6
7
8
IN
DIP/SO
V
CC
16
GND
15
T1
OUT
14
R1
13
IN
R1
12
OUT
IN
IN
OUT
TTL/CMOS
TTL/CMOS
OUTPUTS
T1
11
T2
10
R2
9
INPUTS
NOITPIRCSED
1
C1+
C1
3
C1-
4
C2+
C2
5
C2-
T1
11
T2
10
R1
12
9
R2
Functional Block Diagram
V
DD
14 kΩ
MR
R1
SENSE 1
R2
R3
SENSE 2
GND
Reference
Voltage
of 1.25V
SENSE 3
TPS3307-33DGNR Supervisor
+5V INPUT
C5
V
CC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
400k
IN
+5V
400k
IN
OUT
OUT
GND
C3
16
2
+10V
V+
6
-10V
V-
C4
T1
14
OUT
RS-232
OUTPUTS
7
T2
OUT
R1
13
I
N
RS-232
5k
INPUTS
8
R2
IN
5k
15
SOT−223
1
Pin:1. Adjust/Ground
TPS3307
+
_
+
_
R4
_
+
3
2. Output
3. Input
RESET
Logic + T imer
Oscillator
Top View
Tab
23
1
RESET
RESET
MAX232D RS-232 Driver / Receiver
NCP1117ST33T3G 3.3V Regulator
91
Page 92
Troubleshooting
Symptom Check…
No power
Power is on, but no sound
Power is on, but sound is
low
Sound is distorted
Unnatural sound
User interface controls do
not operate properly
• Turn on power.
• Make sure the power cord is plugged in.
• Make sure the source is turned o n.
• Verify that there is an input signal from the source. The au dio
input signal indicator on the front of the chassis should be
green.
•Check the output signal indicators on the system controls. If the
LED is no lit (green), th e out put levels may be too low.
• Check the source routing.
• Check the cable connections from the source to t he chassis.
• Verify that the audio input indicator is lit (green). If it is not lit,
increase the source outpu t or increase the input gain.
•Verify that t he input clipping indicators are not l it (red). If an LED
is red, reduce the source output level or reduce the input gain.
•Verify that the out put clipping indicators are not lit (red). If one is
red, but input clipping LEDs are not, reduce the output gain.
•If the input source s ig n al is clean when it enters the chassis a nd
the input and output indicators are green, verify that the
loudspeakers are not overdriven or damaged.
•Verify that the correct EQ is selected for speakers connected to
the output channel.
• Verify that the spea kers are wired correctly (+ to + and – to -).
• Verify that the interf ace s are wired correctly and to the proper
zone (if there is more than one z one).
•Check the wiring for br eaks or shorts in the cable.
92
Page 93
Service Manual Revision History
Date Revision
Level
7/07 00 D ocument release d at revision 00. Ser vi ce manual
4/10 01 Added fuse part num bers for F 611, F612
and F701.
Descri pt ion of Change Change Drive n
By
release
New part numbers 18, 44
Pages
Affected
All
93
Page 94
SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
Bose Corporation
The Mountain
Framingham Massachusetts USA 01701
P/N: 294962-SM Re v . 01; 4/2010 (P)
http://serviceops.bose.com
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