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181816
Schematic
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BOSE 181816 Schematic

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FreeSpace Business Music System Manual pn 181816
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING.................................................... 2
SAFETY INFORMATION................................................................................................................................... 3
IDENTIFICATION OF UNIT UNDER TEST....................................................................................................... 4
SPECIFICATIONS............................................................................................................................................. 5
THEORY OF OPERATION................................................................................................................................ 7
DISASSEMBLY/ASSEMBLY PROCEDURES................................................................................................. 11
Main Assembly Procedures ....................................................................................................................... 11
TEST PROCEDURES..................................................................................................................................... 18
PART LISTS AND EXPLODED VIEWS........................................................................................................... 21
Figure 8. Flush-mount Loudspeaker Packaging Illustration........................................................................28
FreeSpace®6 Electrical Part List, PCB P/N 177300, Revision 0 .............................................................. 31
FreeSpace
SCHEMATICS AND PCB LAYOUTS............................................................................................................... 49
6 Electrical Part List, PCB P/N 177300, Revision 1 .............................................................. 40
1
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)
DEVICE HANDLING
This unit contains ESD sensitive devices. We recommend the following precautions when repairing, replacing or transporting ESD sensitive 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.
CAUTION: THE FREESPACE®6 BUSINESS MUSIC SYSTEM 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.
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. Perform 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) 1492 (71). 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 milliampere. 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 the exposed metallic part has a return path to the chassis, the reading should be between 1 and 5.2 Megohms. When there is no return path to the chassis, the reading must be "infinite". 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.
3

IDENTIFICATION OF UNIT UNDER TEST

When servicing a FreeSpace®6 take notice of the following attributes:
• PC Board Part Number
• Revision Level Number of the PC Board
• Unit's Voltage Variation Type (100V,120V, 220V, 240V).
There are two types of FreeSpace 6 units manufactured. If the unit you are servicing has a switch denoted by surface/flush mount speaker icons in block 12 of the front panel, then you have a 2 EQ unit. If not, then you have a 1 EQ unit.
The EQ changes are represented on page 56 (Sheet 7, PCB Tone Control and Surface EQ) of this manual. The 2 EQ unit will have all optional components (OPT) populated on the I02 board. The 1 EQ unit will be depopulated.
Refer to the applicable part list and schematics as follows:
• There are two Electrical Part Lists, one for Revision 0 and one for Revision 1 of PCB
177300.
• The PCB Schematics and Layout views supplied with this service manual are applicable
for Revisions 0 and 1 of PCB 177300.
NOTE: The PC board revision level number is marked on the PC board as follows:
1
4

SPECIFICATIONS

Dimensions Module 4.0" H x 7.5" W x 15.0" D (10.16 x
19.05 x 38.10 cm)
Flush-mount Speaker Assembly: Flange Dia.: 6.25" (15.9 cm)
Hole Dia.: 5.75" (14.6 cm) Depth: 6.5" (16.5 cm)
Surface-mount Speaker Assembly: 3.3" H x 7.6" W x 6.4" D (8.3 x 19.3 x
16.33 cm)
Weight Module: 11.3 lb. (5.14 kg.)
Flush-mount Speaker Only: 2.1 lb. (.97 kg) (Including Mounting Hardware): 4.2 lb. (1.9 kg) Surface-mount Speaker (Including Mounting Hardware):
Driver Flush-mount & Surface-mount Speaker: 2.5" Full-range Driver Beamwidth Flush-mount & Surface-mount Speaker: 150° @ -6 dB
2.5 lb. (1.2 kg)
Performance Specifications
Input Sensitivity Music Input: 200mV
Page Input: 20 0 µ V
Power Output 16W into 2Ω load Power Requirements 120V or 220-240V ~ 50/60 Hz Remote Volume
Control Value Music Input Impedance Channel A: Balanced: 32kΩ
Channel A: Unbalanced: 11kΩ Channel B: Unbalanced: 10kΩ
Page Input Impedance Balanced: 9kΩ
Unbalanced: 1kΩ
Page and Line Output Impedance
Page Gain 0dB to 80dB adjustable Frequency Range 80Hz - 16kHz Noise (line into loudspeaker outputs): 20Hz - 20kHz bandwidth; -65dBV at
Frequency Response 20Hz - 20kHz, ±1dB, referenced to
10kΩ, Audio taper
400Ω
20dB gain into 10kΩ load
1kHz at line outputs
5
Performance Specifications (Continued)
Maximum Acoustic Output
Opti-voice® Paging Circuitry
82dB-SPL in 20,000 cubic feet room with a speech band RT
Ensures a constant paging level over a 30dB dynamic range by compressing the page signal. Music gradually returns to original level after page.
60 of 0.5 secs
6
THEORY OF OPERATION
1. OVERVIEW
®
The FreeSpace cial environments. The FreeSpace 6 components have been engineered to work together as a system. The electronics have separate compressors for music and paging sources that de­crease the dynamic range of the audio signal, thereby increasing the audibility of musical passages and paging anouncements. A protective compressor in the power amplifier prevents audible overload distortion if the user attempts to play the system too loud.The system has the following features:
• High-fidelity sound over a large area
• Active equalization, music compression, and system overload protection
• Opti-voice® circuitry for high quality paging capability
• Remote control of volume and source selection
The circuit descriptions that follow are grouped according to the PCB section and sheet num­ber of the schematic.
2. IO1 PCB
2.1 IO1 PCB Schematic Sheet 1
6 business music system delivers high-fidelity music and paging in commer-
Music Input A is routed through a differential input amplifier (U4) which accepts balanced sources or unbalanced sources. The amplifier output is passed through a gain trim pot and presented to the Music A/B selector. Music Input B is fed directly to a gain trim pot and then to the Music Input A/B selector.
Music Selector A/B is a 2P2T analog switch, implemented with a special switching op amp (U11,U12)). The op amp is controlled by the signal SELECTB.
The Music Selector Interface is a two transistor circuit that normally selects Music Input A. With the Remote Selector switch open, transistor Q2 is on, which turns on D4, the Source A LED, pulling SELECTB low. This turns off Q1, keeping its LED off. When the Remote Selector switch is closed, Q2 is turned off, allowing Q1 and D3 (the Music B LED) to turn on. This moves SELECTB high and turns off the Source A LED. When SELECTB is high, current is no longer sunk from U11 and U12’s SW pin, and they select Music Input B.
2.2 IO1 PCB Schematic Sheet 2
On their way to the compressor, the left and right music signals pass through a stereo/mono switch, S1. After the compressor (U7 and part of U6), the music signals leave this sheet. The compressor is enabled by a logical function of SELECTB, Music Compressor A, and Music Compressor B enable switches. The logic (U8) determines that the compressor will be enabled only for a music source if that source is the one currently selected and if it has been enabled for compression via its switch (S2 or S3).
The compressor offers a maximum gain of about 20dB for very low level signals and operates at a 2:1 slope. It slowly raises the level of quiet musical passages, and quickly reduces the level of loud passages. The two channels are cross coupled to maintain a centered stereo image. By selecting the rectifier input source as a DC current, the compressor is disabled (U9).
7
The two sections of U15 are used to control a bi-colored Music-Compressor LED, D2. As long as the compressor is enabled, the LED glows green to indicate how active the compressor is. Whether or not the compressor is enabled, the LED is also acting as a watch dog and will flash red if the signal presented to the music compressor is too great for it to handle.
2.3 IO1 PCB Schmatic Sheet 3
The Page Input is presented to a differential amplifier (U2) that can handle a wide range of source voltages, as well as balanced or unbalanced sources. S5 determines the gain of the first stage (0dB or 30dB). The page signal next passes through U2, where it can be given a gain of 0 to 30dB, as determined by R1. At S4, the page signal is routed either through
another variable gain stage (U2, gain adjustable from 0 to 20dB), or through the Opti-voice
®
compressor. The Opti-voice compressor (U5 and part of U6) provides anywhere from 20dB of gain to 10dB of loss, depending upon the signal level.
Finally, the output of S4 is passed through the Page Muting stage (part of U10, Q3, and Q4), in which it is muted unless the page trigger circuits have detected a signal. The Page Output connector (J2) is driven by part of U10, acting as a buffer stage.
The two sections of U3 are used to control a bi-colored Opti-voice Compressor LED, D5. As long as the compressor is enabled; the LED glows green to indicate how active the compres­sor is. Whether or not the compressor is enabled, the LED is also acting as a watch dog and will flash red if the signals at U2’s outputs are too great for the compressor to handle.
2.4 IO1 PCB Schematic Sheet 4
The Page Trigger circuits first offer a user sensitivity adjustment, via R3, then provide up to 26dB of gain for the trigger signal. V13, Section B acts as a threshold comparator and a peak hold circuit. For signals exceeding the threshold, the circuit changes state rapidly, and holds the new state long enough to ride through syllabic and inter-word pauses in paging. The two remaining sections of U13 provide a fade-back time constant for the music and adjust the control voltage levels to suit the muting transistors Q3,4,5,6 and 7.
Two sections of U14 mix the music and page signals, while the other two sections of U14 provide the mono versions of the music signals and the music+page signals. Switch S9 en­ables paging in the signals fed on to the speaker outputs. R2 allows for adjustment of the page level relative to the music.
3. IO2 PCB
3.1 IO2 PCB Schematic Sheet 5
S7, the Line Output Mode switch, selects the signals sent on to U200 and the Line Outputs. Relay K1, controlled by Q201 and Q200, mute the Page and Line Outputs during power on and power off transitions to prevent glitches from reaching the outputs.
8
3.2 IO2 PCB Schematic Sheet 6
The remote volume control function is implemented on this sheet with a dual VCA, IC U201, and its buffer, U202. (An alternate part could be used in U201A, but this is a manufacturing alternative, not a field service alternative.) U201 is controlled by a current sourced into the signal VCA, coming from Sheet 7. When VCA is about 2mk, gain is at its maximum, which is unity (0dB). When the current into VCA is zero, the gain is essentially off (-80dB or so).
S4 and its related components are factory set gain trims.
3.3 IO2 PCB Schematic Sheet 7
Transistors Q202, Q203 and related components transform the variable resistance of the remote volume control into the current source that feeds signal VCA, on Sheet 6.
U205 is a conventional bass and treble control, while U203 is an equalizer stage intended to
®
provide the EQ adjustment needed when FreeSpace
6 systems are configured with Surface-
mount loudspeakers (as opposed to the Flush-mount FreeSpace 6 speakers).
4. Power Amplifier PCB
4.1 PA PCB Schematic Sheet 8
U301, part of U300, and U302 implement a acoustically correct low frequency compensation for more natural bass. The other two sections of U300 process the signal CD-DIA (“clip­detect-diagnostic”, see Sheet 10) into a control signal that is sent through P2A, remote volume control circuit on Sheet 7 . CD-DIA becomes active when the power amplifiers are driven into clipping. This in turn causes the remote volume control circuit to be turned down so that clip­ping ceases.
4.2 PA PCB Schematic Sheet 9
U303 combines the low frequency compensation signal with the full range signals and then equalizes them to compensate for room acoustic and speaker driver characteristics.
4.3 PA PCB Schematic Sheet 10
U304 and U307 are power amplifiers with differential outputs. Both amplifier outputs can deliver 16 watts into the nominal 2 ohm load of a pair of FreeSpace 6 speakers. The CD-DIA pins are pulled low when the amplifiers begin to clip. This is used to control a compressor implemented on Sheet 9 and Sheet 7.
D306 develops the DC power supply for the power amplifier. Q305 and associated compo­nents constitute a shunt voltage regulator which only conducts in the unlikely event of both a high power line voltage and a low or no signal output case. It holds 18V maximum which is presented to U304 and U307.
D305, U305, and U306 are the +/-15V supply for all the circuits except for the power amplifier. The power transformer secondary plug can be inserted two ways; one way will handle a nomi-
nal 120VAC main, the other a nominal 240VAC main. The two orientations of this plug are noted on the PCB.
9
5. Remote PCB
REM PCB Schematic Sheet 11
The circuits on this sheet are contained on a small PC board inside the remote control. The potentiometer is wired as a 10K ohm rheostat and controls the remote volume control circuits on Sheet 6, while the SPST switch controls the Music Selector on Sheet 1.
10
DISASSEMBLY/ASSEMBLY PROCEDURES
Main Assembly Procedures
Note: Certain parts will be referred to in
these procedures. The numbers in paren­theses represent individual parts called out in Figure 1. The callout numbers corre­spond to those on the part lists.
1. Chassis Cover/Top Cover Removal
1.1 Place the amplifier flat on the work-
bench with the Bose corner.
1.2 Detach the chassis cover (1) by holding both corners and pulling upward. Once the cover is loosened, slide the bottom tabs out and away from the unit.
1.3 Use a phillips-head screwdriver to remove two silver screws (2) securing the chassis top cover (3).
®
logo in the upper-left
2.2 Align the screw holes of the top cover with the screw mounts located on the base. Also align the four metal tabs on the base with the tab slots on the cover. There are also six metal tabs located on the bottom edges of the cover that must be aligned when the cover is finally seated.
2.3 Slide the cover down over the base until the screw holes are aligned and all tab slots are locked into place.
2.4 Secure the chassis top cover (3) by tightening two silver screws (2) with a phillips-head screwdriver.
2.5 Position the three bottom tabs on the chassis cover into the slots located in the chassis base. Press the chassis cover down over the chasis-top cover to secure it.
3. Amplifier PCB Removal (Chassis Base)
1.4 Gently lift the right side of the chassis
top cover up at a 45° angle and pull to the right and up. This is done to clear the left screw mount away from the Amp PCB (8) when the cover is lifted off.
IMPORTANT: Be careful not to pull the three cables connected to the Amp PCB (8)
assembly. They must be disconnected before final removal of the chassis-top cover.
2. Chassis Cover/Top Cover Replacement
2.1 Place the chassis-top cover (3) over the
chassis base (4). Align the cover so that the left-side screw mount of the chassis base will slide between the IO1 PCB (8) and the inside surface of the chassis-top cover. Otherwise there will be difficulty securing the cover.
3.1 Remove the Chassis Cover/ Top Cover (Procedure 1) .
3.2 Separate the chassis-top cover from
the base by disconnecting both two-pin cables from the Amp PCB's (8) P3A and P3B connectors. Disconnect the eight-pin cable from the Amp PCB's P2A connector.
3.3 Disconnect the following cables:
• Disconnect the transformer's five-pin primary cable from the Amp PCB's P7 connector.
• Disconnect the transformer's five-pin primary cable from the Amp PCB's P4 connector.
• Disconnect the main power two-pin primary cable from the Amp PCB's P4 connector.
IMPORTANT: Be sure to notice the orien­tation of the transformer's five-pin primary cable. Pin 1 is keyed to pin 1 of Amp PCB connector P6 (or P7 depending upon the unit's applicable voltage rating).
11
CHASSIS COVER
1 
2
CHASSIS TOP COVER
COUPLER BAR
3
IO1 PCB
7
8
6
IO2 PCB
8
8
AMP ASSY
5
9
P3B
P2
P5
P3A
5
10
12
5
CONNECT
TO P3B BLU./GRY.
CONNECT
TO P3A RED/BLK.
PRIMARY
5
2X
11
CONNECT
TO P5
CHASSIS BASE
4
SECONDARY
13

Figure 1. Main Disassembly/Assembly Exploded View

12
3.4 Remove two black screws (5) from the
Amp PCB (8) and three black screws (6) from the Heatsink (7).
3.5 Remove the Heatsink/Amplifier PCB Subassembly from the chassis base.
3.6 Place the subassembly on the work­bench with the heatsink (7) fins down.
3.7 Remove three black decoupler bar screws (5) that connect the heatsink to the Amplifier PCB.
3.8 Remove the Amplifier PCB (8) from the heatsink.
4. Amplifier PCB Replacement (Chassis Base)
IMPORTANT: Thermal grease should be
applied to the heatsink before seating the PCB.
4.4 Connect the following cables:
• Connect the main power's two-pin cable to the Amp PCB's P5 connector.
• Connect the tranformer's secondary five­pin cable to the Amp PCB's P4 connector.
• Connect the transformer's primary five-pin cable to the Amp PCB's P7 connector.
IMPORTANT: Pin 1 of the transformer's five-pin primary cable is keyed to pin 1 of Amp PCB connector P6 (or P7 depending upon the unit's applicable voltage rating).
4.5 Install the Chassis Cover/Top Cover (Procedure 2).
5. Transformer Removal
5.1 Remove the Chassis Cover/Top Cover (Procedure 1).
5.2 Disconnect the following cables from
the transformer:
4.1 Place the Amplifier PCB (8) onto the heatsink (7). Align the coupler bar (9) screw holes with the screw holes of the heatsink. The PCB should be component side up with the power devices resting on the inner side of the heatsink.
4.2 Secure the coupler bar and Amplifier PCB to the heatsink by tightening three black screws (5).
IMPORTANT: Make sure that the coupler bar does not make contact with the metal tab of transistor Q305.
4.3 Place the Heatsink/Amplifier PCB subassembly solderside down into the chassis base. Secure the upper-left hand corner of PCB onto the standoff snap. Secure the subassembly to the chassis base by tightening two black screws (5) on the Amp PCB and three black screws (6) on the heatsink.
• Disconnect the transformer's five-pin primary cable from the Amp PCB's P7 connector.
• Disconnect the transformer's five-pin primary cable from the Amp PCB's P4 connector.
5.3 Remove transformer cables from cable clamps (12) and lift the transformer from the chassis base (4).
6. Transformer Replacement
6.1 Place the transformer (10) into the
recess of the chassis base and align it with the chassis base mounting holes. Make sure that the primary side is facing the IEC Connector Assembly
(13).
6.2 Place the two transformer clips (11)
over the transformer's mounting tabs. Secure the transformer to the chassis base by tightening the two black screws (5).
13
6.3 Connect the following cables:
• Connect the transformer's five-pin sec­ondary cable to the Amp PCB's P4 connec­tor.
• Connect the transformer's five-pin pri­mary cable to the Amp PCB's P7 connec­tor.
IMPORTANT: Pin 1 of the transformer's five-pin primary cable is keyed to pin 1 of Amp PCB connector P6 (or P7 depending upon the unit's applicable voltage rating).
6.4 Install the Chassis Cover/Top Cover (Procedure 2).
7. IO1 & IO2 PCB Removal (Chassis Top)
7.1 Remove the Chassis Cover/Top Cover (Procedure 1).
8. IO1 & IO2 PCB Replacement (Chassis Top)
8.1 Connect the 12-pin cable to connector
P1A on the larger board.
8.2 Carefully align both board's connectors into the chassis top cover and snap them onto the chassis standoffs.
8.3 Secure the two-pin and the eight­pin cables into the cable clamps (12).
8.4 Replace six black screws (5) and tighten to secure both boards.
8.5 Install the Chassis Cover/Top Cover (Procedure 2).
7.2 Remove six black screws (5) from both
Amplifier IO PCB's (8). Remove the IO2 PCB board first. Grasp it by the top cor­ners, lift up and off the chassis-top's stand­offs. (Note: The IO boards are connected by a 12-pin cable. Do not attempt to sepa­rate until both are removed).
7.3 Remove both two-pin and eight-pin cables from the cable clamp (12) from the inside of the chassis-top cover.
7.4 Grasp the IO1 PCB board by its top corners, lift up and off the chassis-top's standoffs. Position the board at a 45° angle and carefully pull it back so that the I/O connectors clear the top cover.
7.5 To separate boards, disconnect the 12­pin cable from connector P1A on the larger board.
14

Flush-Mount Loudspeaker Procedures

1. Flush-mount Loudspeaker
NOTES: Certain parts will be referred to in
these procedures. The numbers in paren­theses correspond to the individual parts called out in Figure 2.
C. Use Procedure 1.2 to return the grille to the enclosure.
1.5 Terminal Cup Removal
A. Use a phillips-head screwdriver to
remove one screw (7) from the junction-box cover.
1.1 Grille Removal
To remove the grille (Not Shown) take a scribe or a small flat-head screwdriver to grasp an edge of the grille. Gently lift the grille out from the enclosure (2).
1.2 Grille Installation
Push the grille into the enclosure (2) until it is flush with the rim of the enclosure. Orientation of the logo is not necessary.
1.3 Driver Removal
A. Use Procedure 1.1 to remove the grille from the enclosure (2).
B. Use a phillips-head screwdriver to remove four screws (3) securing the driver (4) to the enclosure's baffle (6). Carefully lift
the driver from the enclosure and cut the wires as close to the terminals as possible.
1.4 Driver Replacement
A. Strip the terminal wires from the terminal
cup (5) and connect them to the replace­ment driver (4). Connect the red wire to the + positive terminal and the black wire to the
- negative.
B. Swivel the junction-box cover out to expose the terminal cup (5) in the recess of the speaker enclosure (2).
C. Use a phillips-head screwdriver to remove three screws (3) that secure the terminal cup to the speaker enclosure.
D. Use Procedure 1.3 to remove the driver (4) from the speaker enclosure (2).
E. Disconnect the terminal wires from the
driver and remove the faulty terminal cup.
1.6 Terminal Cup Replacement
A. Use Procedure 1.4 to connect the replacement terminal cup (5) to the driver (4).
B. Place the enclosure (2) on its side. Fit
the terminal cup into the slot at the back of the enclosure. See Figure 2 for the proper orientation of the terminal.
C. While holding the terminal from the inside of the enclosure, tighten three screws (3) with a phillips-head screwdriver.
D. Use Procedure 1.4 to secure the driver (4) to the enclosure.
B. Align the driver so their four screw holes
align with the screw holes of the enclosure's baffle (6). Secure the driver to the enclosure (2) by tightening four screws
(3) with a phillips-head screwdriver.
E. Use Procedure 1.2 to secure the grille
to the enclosure.
15
Junction-Box Cover
7

Surface-Mount Loudspeaker Procedures

1. Surface-Mount Loudspeaker
3
NOTE: The Surface-mount Loudspeaker
8
has only two removable and replaceable parts, the grille and the grille's scrim cloth. Refer to the Surface-mount Assembly Part List for the grille and scrim cloth's order
2
numbers.
1.1 Grille Removal
5
Red
4
Black
The Baffle is
6
Adhered to Enclosure
3
Item 1 on the  Packaging Part List
Figure 2. Flush-Mount Loudspeaker
Exploded View
Grasp one edge of the grille with a small scribe and gently pull the grille from the
enclosure. The grille's scrim cloth is behind the grille.
1.2 Grille Replacement
1. Place the scrim cloth inside the grille.
2. Place the grille over the twiddler section
of the enclosure (Refer to Figure 3 for the correct orientation). Press the grille until it snaps into place.
16
Grille

Figure 3. Surface-mount Loudspeaker

17

TEST PROCEDURES

Main Assembly Test Procedures

Test Set-Up Parameters
Switches
All switches are referenced by their block diagram location on the top of the unit. Set them according to the table below.
Block
No.
10 Line Output Mode center(Music
Switch Description Setting(s)
1 Page Source Gain left (0dB) 2 Optivoice Compressor left(off) 5 Page Enables Left and
Right
7 Music Compressors A
and B
9 Music Input Mode rear(stereo)
right(on) forward(off)
+Page)
Input Connections
Page Input Connect the positive (+) side of an oscilla-
tor to the positive input terminal. Connect the negative (-) side to the negative (-) and common input terminals. Do this using quick connectors (P/N180094) supplied with the unit.
Music RCA Inputs A, B (Left and Right) Connect the positive (+) side of an oscilla-
tor to the positive input terminal on the RCA jack. Connect the negative (-) side to the negative (-) and RCA jack ground sleeve.
Output Connections
Page and Line Outputs (Left and Right)
Potentiometers
All potentiometers are referenced by their block diagram location on the top of the unit. Set them according to the table below.
Block
No.
1 Page Source Gain 3 Page Trigger 4 Page Mix Trim cw(max)
6 Music A and B Source
12 Treble and Bass Trim center(flat) 13 Volume Trim Right cw(max
Pot. Description Setting(s)
ccw(0dB)
Trim
cw(max)
Level
cw(max
Trim
gain)
gain)
Connect the positive (+) side of the test equipment to the positive (+) output termi­nals. Connect the negative (-) side to the negative (-) output terminals. Do this using quick connectors (P/N180094) supplied with the unit.
Speaker Output (Left and Right) Use the same output connections as above
with a 2Ω/50Watt resistor as a load.
All test equipment should be isolated from ground (floated).
18
1. Page Input To Page Output Gain
6. Noise
1.1 Apply a 5 Vrms, 1KHz signal to the
Page Input.
1.2 Measure the Page Output. Should be
4.22 Vrms (+ .78 Vrms/ - .67 Vrms).
2. Page Input To Line Outputs Gain
2.1 Apply a 5 Vrms, 1KHz signal to the
Page Input.
2.2 Measure the left and right Line Output. Should be 4.22 Vrms (+1.09 Vrms/ -.87
Vrms).
3. Music Input A to Line Outputs Gain
3.1 Apply a 500mV rms, 1KHz signal to the
Music A left and right input.
3.2 Measure the left and right Line outputs. Should be 4.47 Vrms (+.84 Vrms/ - .71
Vrms). Note: Repeat this test for Music Input B.
To select Music Input B, short the remote select input.
4. Music Input A to Speaker Outputs Gain
6.1 Set the volume control to Max.
6.2 With the source off, measure the left
and right Speaker output. Should be
mVrms.
7. Full Power Distortion
7.1 Apply a 130 mVrms, 800 Hz signal to
the left input.
7.2 Measure the distortion at the left Speaker output. Should be
7.3 Change the frequency to 95 Hz and adjust the applied signal to get 5.66 Vrms at the left Speaker output.
7.4 Measure the distortion at the left Speaker output. Should be Note: Repeat this procedure for the right channel.
8. Separation
8.1 Apply a 100 mVrms, 800Hz to the right
Music A Input. Terminate the left Music A Input with a 50
Ω resistor.
≤ 1% THD.
≤ 2 %.
≤ 5.6
4.1 Apply a 10 mVrms, 2KHz signal to the left and right Music A input.
4.2 Measure the Speaker output. Should be 290 mVrms (+54mVrms/ - 46mVrms).
5. Frequency Response
5.1 Apply a 10 mVrms, 2KHz signal to the
left and right Music A Input.
5.2 Reference a dB meter to the Speaker output and set level to 0 dBr.
5.3 Change the signal to 12.5 KHz.
5.4 Measure the left and right Speaker output. Should be 5.1 dBr (
± 2.0 dB).
8.2 Measure the left Speaker output. Should be Note: Repeat this procedure for the right channel.
19
≤ 10 mV.

Loudspeaker Test Procedures

NOTE: These procedures apply to both Flush-mount and surface-mount loudspeakers. The surface-
mount loudspeaker is not repairable. If this loudspeaker fails the following tests contact your Bose® Field Service Representative.
1. Rub and Tick Test
Apply a signal of 6.0 Vrms at 80 Hz to the input terminals of the loudspeaker. See Figure 1. No extraneous noises such as rubbing or ticking should be heard. Replace any driver that has a rubbing or ticking noise.
NOTE: There is a normal suspension noise. To distinguish between a rub or tick and suspension noise, displace the cone slightly with your finger. If the rubbing can be made to go away or get worse, then it is a rub or tick and the driver should be replaced. If the noise stays the same, it is a suspension noise and the driver is fine. Suspension noise will not be heard with program material.
2. Air Leak Test
Apply a signal of 6.0 Vrms ± 1V at 80 Hz to the speaker input terminals. See Figure 1. For at least 5 seconds, listen for air leaks around the driver, speaker terminals, and along all cabinet joints. Repair air leaks as required.
3. Sweep Test
Sweep the oscillator from 50 Hz to 5 kHz at 6Vrms. There should not be any loud extraneous sounds. If there are any loud buzzes or distortion, replace the driver. The whooshing noise from the port at around
80 Hz is acceptable.
NOTE: There should not be any buzzes or rattles from the internal connecting wires or components.
Redress any wire or component that buzzes.
Input Terminals
Figure 1. Input Terminals
4. Phase Test
NOTE: Supply voltage should only be momentarily applied to the speaker input terminals to avoid
possible damage to the speaker.
Apply a 6 Vdc ± 1 Vdc signal to the speaker input terminals (see Figure 1). The driver should move outward.
20
PART LISTS AND EXPLODED VIEWS
The following section contains part lists and exploded views for the FreeSpace®6 business music system. The part lists are broken down as follows:
• Main Assembly Part List and Main Assembly Exploded View.
• Remote Assembly Part List and Remote Assembly Exploded View
• Main Assembly Packaging Part List and Main Assembly Packaging Exploded View.
• Flush-mount Loudspeaker Assembly Part List and Exploded View.
• Flush-mount Loudspeaker Assembly Packaging Part List and Packaging Illustration.
• Surface-mount Loudspeaker Assembly Part List and Illustration.
• Surface-mount Loudspeaker Assembly Packaging Part List and Packaging View.
• Electrical Part Lists : These lists contain all electrical and mechanical parts located
on the PCB assembly 177300, Revisions 0 and 1.
PCB layouts and schematics are located in the back of the service manual.
21

Main Assembly Part List (Figure 4)

Item
Number
Description Part Number Qty
Per
See
Note
Assy
1
Chassis,Cover,FreeSpace®6 2 Screw,Mach,8-32,Pan,Xrec/Slot 172715-08 2 3 Chassis,Top Cover,FreeSpace 6 177286 1 4 Chassis,Base,FreeSpace 6 177285 1 4 5 Screw,#8-32x.25,Pan,Xrec 179096-04 13 6 Screw,#8-32x2.75,Pan,Xrec 179096-44 3 7 Heatsink,FreeSpace 6 177283 1 4 8 Pcb Assy,FreeSpace 6,Amp,S/f 181692 1 1,3 9 Coupler Bar,FreeSpace 6 177284 1 10 Transformer,120/240V,FreeSpace 6 177278 1 2
!
Transformer,100V,FreeSpace 6 178892
177287 1
11 Clip,Transformer 179108 2 12 Clip,Cable,Dbl Face Adh,.76" 131062 3 13 Conn Assy,IEC Receptical 179064 1 14 Nut,Hex,8-32,keps 100413-2 1
Notes:
1. The individual parts located on the PCB's are listed in the Electrical Part List.
!
2. 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.
3. The PCB Assembly is divided into three parts: the Amplifier PCB, IO1 PCB, and IO2 PCB. The PCB locations are identified on the FreeSpace 6 Exploded View. This information is provided for reference only.
4. This part is not normally available from Customer Service. Approval from the Field Service Manager is required before ordering.
22
CHASSIS  TOP COVER
3
IO1 PCB
7
1
CHASSIS COVER
2
LOCATE WITHIN
BOX EMBOSSED ON CHASSIS
12
1
1
1
1
8
6
12
C43
LOCATE WITHIN
12
BOX EMBOSSED ON CHASSIS
14
COUPLER BAR
CHASSIS
BASE
9
5
4
IO2 PCB
SECONDARY
P3B
8
AMP ASSY
8
P2
P3A
P5
CONNECT TO P5
5
10
5
11
5
CONNECT TO P3B
2X
PRIMARY
13

Figure 4. Main Assembly Exploded View

TOP VIEW
23
Remote Assembly Part List
Item
Number
Description Part Number Qty
Per
See
Note
Assy
1 PCB Assy,FreeSpace 6,AMP,S/F 181692 1 2 Cover,Remote,FreeSpace 6,Europe 178101 1
Cover,Remote,FreeSpace 6,Japan 178102 1
Cover,Remote,FreeSpace 6,Aus,Am/Can 178103 1 3 Knob,Remote,FreeSpace 6 178104 1 4 Screw,OVLHD,6-32x1.00,Am/Can 178115-16 2
Screw,OVLHD,M3.5x25mm,Aus,Europe 178116-25 2
Screw,OVLHD,M4x25mm,Japan 178117-25 2 5 Screw,TAPP,6-13x.5,PAN,XREC 173555-08 2 6 Cable Tie 135540 2 7 Bag,Poly,6x10x5 mil 147794 1
4
3
2
1
6 2 PLCS.
BLACK
YELLOW
7
5
Figure 5 Remote Assembly Exploded View
24
Main Assembly Packaging Part List (Figure 5)
Item
Number
Description Part Number Qt y
Per
See
Note
Assy
1 Packing, Endcap, EPS, Left 177949 1 2 Polybag, 12"x8"x24" 143076 1 3 Packing, Endcap, EPS, Right 177305 1
4 Rem,RVC Walplt,Frspc 6,US/CAN 178111 1
Rem,RVC Walplt,Frspc 6,Eur 178113 Rem,RVC Walplt,Frspc 6,Japan 178112 Rem,RVC Walplt,Frspc 6,Australia 181735
5 Packing, Crease Sheet 177950 1
6 Line Cord,120V,Detachable, US/CAN 173350 1 1
!
Line Cord,230V,Detachable,UK 173351 Line Cord,230V,Detachable,Europe 173352 Line Cord,240V,Detachable,Australia 173354 Line, Cord,100V,Detachable,Japan 181690
7 Carton, RSC 177948 1
8 Lit kit Assy,FS6,F/S,Japan 181704-1 1
Lit kit Assy,FS6,F/S, Australian, Eur,UK,
181704-2
US/Can
9 Connector Kit, Assy 180094 1
Note:
!
1. 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.
25
8
1
2
3
9
4
5
6
7
Figure 6. Main Assembly Packaging Exploded View
26
Flush-mount Assembly Part List
Item
Description Part Number Qty See
Number
1 Grille Assy. 1 2 Enclosure Assy, Back Can, 102-F6 ----------- 1 * 3 Screw, Hilo, 8, Pan, Xrec 172721-10 7 4 Twiddler, 2.25" 149167 1 5 Cup, Terminal 176459 1 6 Baffle, 75 Cu In, White ----------- 1 * 7 Screw, Mach, 8-32, Pan,Xrec/Slot 172715-08 1 8 Foot, Clear, .312x.085, Bulk 178321-99 2
*This part was listed and illustrated for reference purposes only.
7
Note
Junction-Box Cover
5
Red
4
3
8
2
Black
The Baffle is
6
Adhered to Enclosure
3
Item 1 on the  Packaging Part List
Figure 7. Flush-mount Exploded View
27
Flush-mount Packaging Part List
Item
Description Part Number Qty See
Number
1 Shield, Paint 180092 1 2 Grille Assy, 4pk, Wht 178133-2 1 3 Pan Mounting Assy, 4 Pk 178135 1 4 Spring Assy, 8 Pack, Freespace 6 178132 1 5 Carton, RSC 177752 1 6 Packing, Insert 177744 1 7 Packing, Crease Sheet, 18x21 177749 1 8 Packing, Crease Sheet, 16.07x5.75 177747 1
9 Packing, Crease Sheet, 20.75x17.0 177750 1 10 Bushing, Short,.75" 146046 1 11 Bag,Poly, 14.38x9.87x2 Mil 103351 1 12 Packing, Sheet, 8.75x8.75x.03 180023 1
Note
7
10
9
8
4
2
12
3
6
5
Figure 8. Flush-mount Loudspeaker Packaging Illustration
28
Surface-mount Assembly Part List
Item
Description Part Number Qty See
Number
1 Knob, White 178149-02 1
Knob, Gray 178149-01 1
2 Grille, Speaker, Computer Gray 177146-01 1
Grille,Speaker, Arctic White 177146-02 1
3 Cloth, Scrim, Grille 181192 1*
*Part not illustrated
Note
23
1
Figure 9. Surface-mount Loudspeaker Illustration
29
Surface-Mount Packaging Part List
Item
Description Part Number Qty
Number
1 Bracket, Wall, White 178146-02 4
Bracket, Wall, Gray 178146-01 4
2 Knob And Pkg Assy, Arctic White 181736-02 1
Knob And Pkg Assy, Gray 181736-01 1 3 Carton, 4 Pack 181535 1 4 Packing, End Cap, 181537 8 5 Packing, Crease Sht, 46.5x8.5 181536 1 6 Bag, Poly, 14.38x9.87x2 Mil 103351 4
2
5
Per
Pack
See
Note
1
6
4
3
Figure 10. Surface-mount Loudspeaker Packaging
30
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Resistors
Reference
Description Part Number Reference
Designator
R1 Pot,Rotary,50kΩ,
10%,Dual
R2,3,5 Pot,Rotary,10kΩ,
10%,Single
R6-9 Pot,Rotary,10kΩ,
10%,dual
R10,11,27,36­39,44,45,47,50,52, 53,55,56,61,63,64, 65,70-72,75,85,89, 96,99,101,107,110, 116,128,129,130, 135,152,202,204, 206,212,213,218, 219,221,222,240, 256,265,275,315, 319,321,322,336, 339,345, 378,379 R12,203,214,362 402Ω,1%,1/10W,
R13,18,59,76,87,94, 127, 137,291,331, 335, 355
R14-17,21,34,35,62, 66, 79,88,95,98,103, 106,109,112,136, 287,320
R19,20,86 1.54KΩ,1%,1/10W, R22,23,311 5.62KΩ,1%,1/10W, R24,25,28,29,31,
113,123,124,307, 310, 377
R26,253,255,267, 269,312
R32,58,74,151,257, 258,264,266,305
R33,90,92 1.2KΩ,2%,1/4W, R40,117,200,216,
350,376 R41,208,306 301KΩ,1%,1/10W,
R42 26.7KΩ,1%,1/10W, R43,121,143,201,
210,217,236,
10.0KΩ,1%,1/10W, 0805
0805
30.1KΩ,1%,1/10W, 0805
1.00KΩ,1%,1/10W, 0805
0805 0805
20.0KΩ,1%,1/10W, 0805
7.50KΩ,1%,1/10W, 0805
1MΩ,5%,1/10W,
0805 52mm,CF
100Ω,1%,1/10W, 0805
0805 0805
301Ω,1%,1/10W, 0805
177289-503 177290-103
177289-103
133625-1002
133625-4020 133625-3012
133625-1001
133625-1541 133625-5621 133625-2002
133625-7501 133626-1055
121243-1211222
133625-1000 133625-3013 133625-2672 133625-3010
31
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Resistors (Continued)
Reference
Description Part Number Reference
Designator
R46,54,73,209 56.2KΩ,1%,1/10W,
0805
R51,119,120,125,12 6, 138-141,325,346
R57,91,97,102,104, 111,133,157,160, 207,224,241,277, 279,304,317,358
R60,78 68.1KΩ,1%,1/10W, R67,83,237,301,333
353 R68 15.0KΩ,1%,1/10W,
R69 45.3KΩ,1%,1/10W, R77,84 127KΩ,1%,1/10W, R80 26.1KΩ,1%,1/10W, R81 1.82KΩ,1%,1/10W, R82,131,154 17.8KΩ,1%,1/10W, R91,205,215,278,
326,327,347,349 R93,118,318 2.43KΩ,1%,1/10W,
R100,108 2.55KΩ,1%,1/10W, R105,316,368, 370 47.5KΩ,1%,1/10W, R114,357 200KΩ,1%,1/10W, R115,134 73.2KΩ,1%,1/10W, R122,142 4.75Ω,1%,1/10W, R132,145,148,161,
232,242,260,262, 276,290,292,356, 374,380,381
R144,323,338,343, 363
R146,147,149,150 255Ω,1%,1/10W,
61.9KΩ,1%,1/10W, 0805
100KΩ,1%,1/10W,
0805
0805
4.12KΩ,1%,1/10W, 0805
0805 0805 0805 0805 0805 0805
15.0KΩ,1%,1/10W, 0805
0805 0805 0805 0805 0805 0805
Jumper,Chip,0805
2.00KΩ,1%,1/10W, 0805
0805
133625-5622 133625-6192 133625-1003
133625-6812 133625-4121 133625-1502 133625-4532 133625-1273 133625-2612 133625-1821 133625-1782 133625-1503 133625-2431 133625-2551 133625-4752 133625-2003 133625-7322
133625-4R75
133627
133625-2001 133625-2550
32
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Resistors (Continued)
Reference
Description Part Number Reference
Designator
R153 27.4KΩ,1%,1/10W,
0805
R155158,239 5.11KΩ,1%,1/10W,
0805
R156,159 Pot,Rotary,10KΩ,
10%, 1/2W,Trim
R211,280,340 88.7KΩ,1%,1/10W,
0805
R220,223 11.0KΩ,1%,1/10W,
0805
R238,308,309,313, 314
R254,259,268,274 18.2KΩ,1%,1/10W, R270-273 57.6KΩ,1%,1/10W, R300 25.5KΩ,1%,1/10W, R302 6.49KΩ,1%,1/10W, R303,324,344 14.0KΩ,1%,1/10W, R324,337,359 7.15KΩ,1%,1/10W, R328,352 110KΩ,1%,1/10W, R329,342 9.09KΩ,1%,1/10W, R330,354 23.7KΩ,1%,1/10W, R332,334,348,351 4.99KΩ,1%,1/10W, R341,375 38.3KΩ,1%,1/10W, R364 2.74KΩ,1%,1/10W, R366,367,369,372 RES,CF,1/4W,5%,1 R371 Jumper,22AWG, R373 196Ω,1%,1/10W, R500 Pot,Rotary,10kΩ,
4.75KΩ,1%,1/10W, 0805
0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0 OHM Non-Insul,10.0mm 0805 10%
133625-2742 133625-5111 170042-103 133625-8872 133625-1102 133625-4751 133625-1822 133625-10R0 133625-2552 133625-6491 133625-1402 133625-7151 133625-1103 133625-9091 133625-2372 133625-4991 133625-3832 133625-2741 121243-1211005 148242-100 133625-1960 177299-103
33
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Capacitors
Reference
Description Part Number Reference
Designator
C1,2,29,123,200, 205
C3,7,23,24,25,35, 47,50,51,63,89,93, 100,103,116,117, 118,119, 120
C4,5,36,38,54,86, 90,102,105,202,217, 227,237,301,304, 309,335,348
C6,14,19,39,106, 107,112,113, 114,115,121,122
C8,11,15,18,20,27, 32,46,53,57,62,65, 76, 77,80,81,88,92, 94, 95,96,101,109, 110, 153,201,204, 206, 208,216,218, 220, 222,223,226, 238, 300,307,308, 310, 311,321,324, 501, 512 C9,43,55,79,98,207, 219,312,322
C10,41,59,224,239 10pF,5%,50V,0805, C12,17,108,111,
242,243,244,245, 339, 340,353,354, 357,361,362
C13,314,315,329, 330
C16,320,331,355, 356, 359,360
C21,26,49,52,70,74 680pF,5%,50V, C22,48,68,69,71,75,
84 C28 47uF,20%,16V,105,
C30,33,34,37,40,56, 58,61,66,67,83,85
C31,72,73,78,82, 333,334,349,352
C42,303 15uF,5%,50V,85,
.01uF,10%,50V, X7R,0805
47pF,5%,50V,0805, COG
10uF,20%,35V,85, EL
100pF,5%,50V, 0805,COG
.022uF,10%,50V, X7R,0805
1.0uF,20%,50V,105, EL
COG .10uF,80%,25V,
Y5V,0805
18uF,5%,50V,85, BOX
1000pF,5%,50V, 0805,COG
0805,COG
4.7uF,20%,35V,105, EL
EL
2.2uF,20%,50V,105, EL
.1uF,5%,50V,85, BOX
BOX
133623-103 133622-470
149948-100V
133622-101
133623-223
137126-1R0 133622-100 133624
137127-184 133622-102 133622-681 137126-4R7 137126-470 137126-2R2 137127-104 137127-154
34
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Capacitors (Continued)
Reference
Description Part Number Reference
Designator
C44 220uF,20%,25V,85,
EL
C45,60 100uF,20%,25V,85,
EL
C64,319,327,337, 350, 351
C87 .47uF,5%,50V,85, C104,203,341,342 22uF,20%,25V,85, C225,240,248-250 390pF,5%,50V,0805 C228,241 .0012uF,5%,100V, C229,230,246,247 .047uF,5%,63V,85, C302 .068uF,5%,63V,85, C306 1800pF,10%,50V, C313,317,325,326 .0015uF,5%,100V, C336,345 2200uf,20% ,50v, C344,346,347 3300uf,20%,35v, C363,364 1000pf,20%,250vac,
!
.22uF,5%,50V,85, BOX
BOX EL ,COG 85, BOX, BOX BOX X7R,0805 85,BOX 105,EL 105,EL Y-type,
149948-221E 149948-101E 137127-224 137127-474 149948-220E 133622-391 137127-122 137127-473 137127-683 133623-182 137127-152 144000-222H 144000-332V 170183
Note:
!
1. 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.
35
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Diodes
Reference
Description Part Number Reference
Designator
D1,3,4,6 LED,2.5v,10ma
Green,Vertical
D2,5 LED,2.5v,10ma,
Grn/Red,Vertical
D10,11,13-
Dual,SOT-23,BAV99 147239 17,22,24,107,201, 204,300
D12,20,21,200,302, 309,310
Switching,75V,
300mA D18,19,23,202,203 Zener,18V,1W,5%,
1N4746 D25,27,29,301 Dual,SOT-23,BAV70 147249 *D305 Rectifier,Bridge,
!
100v,1.0a *D306 Rectifier,Bridge,
!
1 00v,6a D307 Zener,16V,1W,5%,
1N4745
Transistors
177280 177281
121501 116995-4746A
143952 *See Note 1 170214 *See Note 1 116995-4745A
Reference
Description Part Number Reference
Designator
Q1,2,202,300,304 BPLR,N,40V,200mA
,SOT23 Q3-7 BPLR,N,SOT23,2S
D2114K Q200 BPLR,P,60V,200mA,
TO-92 Q201 BPLR,N,30V,500mA
,TO-92 Q203,301,302 BPLR,P,40V,200mA,
SOT23 Q305 DARL,NPN, Tip140 177310
Note:
!
1. This part is critical for safety purposes. Failure to use the recommended replacement part may create shock, fire and/or other hazards.
146819 177294 119168 173476 148596
36
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Integrated Circuits
Reference
Description Part Number Reference
Designator
U1-4,10,15,200, 202-205,301
U11,12 Switch,Active, U201 Op-Amp,Dual, U302 Op-Amp,Single, U5,7 Compandor, U6,13,14,300,303 OpAmp,Quad, U8 Multiplexer/
U9 Multiplexer, U302 Op Amp,Sngl,DIP­U304,307 Power Amp,Mult-11, U305 Voltage
U306 Voltage
Op-Amp,Dual, DIP-8,RC4559
SIP-8,BA3128N DIP-16,CN3280 DIP-8,CA3080 NE572N DIP-14,NJM2059 Demultiplexer,8CH,
DIP-16,4051 DIP-16,CD4052 8,CA3080 45W,TDA7396 Regulator,15V,Pos.,
TO-220 Regulator,15V,Neg.,
TO-220
108568 177292 133171 119834 178894 144008 177308
147243 119834 177279 143858
143806
37
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Miscellaneous Components
Reference
Description Part Number Reference
Designator
*F1,2 Fuse,630ma
!
5x20mm
*F3,4 Fuse,Time
!
Lag,Auto,400mA (Inv.)
*F5 Fuse,10.0A,
!
5x20mm,Slo Blo
*F6 Fuse,3.0A,250V,
!
.60x.19,Slo Blo
FC1A,2A,5A,F61A,
Fuseclip,5mm 178548 62A,65A,FC1B,C2B, C5B, F61B,62B,65B
JP300 Jumper,22AWG,
Non-Insul. ,10.0mm J1,2,9,10 Connector,Rt.Ang.,
3 pos,Blk J11,8 Connector,Rt.Ang.,
2 pos,Blk J12 Connector,Rt.Ang.
Beau J3 Connector,Rt.Ang.,
5 pos,Blk J4,5 Connector,RCA,
Dual,Female K1 Relay,24 Vdc,4PDT 144017 P1 Harness,26
AWG,Freespace 6 P1A Connector,Header,
12 pos P2 Harness,24
AWG,Freespace 6 P2A Connector,Header,
8 pos P3 Harness,22
AWG,Freespace 6 P3A ,3B Connector,Header,
Inline,PCB Mnt.,2p P4 Connector,Header,
Inline,PCB Mnt.,5p P5 Connector,Header,
2 pos P6 Connector,Header,
High Current 8mm
pitch
140346-0630 *See Note 1 177312-0400 *See Note 1
177311-10000 *See Note 1
135677-10 *See Note 1
148242-100
177291-03 177291-02 177291-08 177291-05
177295
177298-12 148591-12 177298-08 148591-08
177296 133220-02 133220-05
143963
178742-4
38
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 0
Miscellaneous Components
Reference
Description Part Number Reference
Designator
P7 Connector,Header,
178742-4 High Current 8mm pitch
P9 Connector,Header,5
148591-05 pos
S1-6,S9 Switch,Slide,DPST,
176148 Vertical
S7 Switch,Slide,DPDT 176147 S10 Switch,DIP,SPST,
148777-1 4 pos.
SW500 Switch,SPST,
178108 Rocker
TP1-9,10,500, Connector,Header,
171621-0103 Test Jack,1 pos.,OR
VR300 Varistor,Met. Oxide,
!
170189 275V,75 joule
Note:
!
1. 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.
39
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Resistors
Reference
Description Part Number Reference
Designator
R1 Pot,Rotary,50kΩ,
10%,Dual
R2,3,5 Pot,Rotary,10kΩ,
10%,Single
R6,7 Pot,Rotary,20kΩ,
10%,Dual
R8,9 Pot,Rotary,10kΩ,
10%,Dual
R10,11,27,36-39, 44,45,47-50,52,53, 55,56,61, 63-65, 70-72,75,85,89,96, 99,101,107,110,116, 128-130,135,152, 202,204,206,212, 213,218,219,221, 222,232,240,242, 256,265,275,315, 319,321,322,336, 339,345,378,379 R12,203,214,362 402Ω,1%,1/10W,
R13,18,59,76,87,94 127,137,291,331, 355
R14-17,21,34,35,62, 66,79,88,95,98103, 106,109,112,136, 229,247,287,320
R19,20,86,226,231, 249,252
R22,23 5.62KΩ,1%,1/10W, R24,25,28,29,31,
113,123,124,155, 158,307,310,377
R26 7.50KΩ,1%,1/10W, R32,58,74,151,257,
258,264,266,305 R33,90,92 1.2KΩ,2%,1/4W,
R40,117,200,216, 350,376
R41,208,306 301KΩ,1%,1/10W, R42 26.7KΩ,1%,1/10W, R43,121,143,201,
210,217,236
10.0KΩ,1%,1/10W, 0805
0805
30.1KΩ,1%,1/10W, 0805
1.00KΩ,1%,1/10W,
0805
1.54KΩ,1%,1/10W, 0805
0805
20.0KΩ,1%,1/10W,
0805
0805 1MΩ,5%,1/10W,
0805 52mm,CF
100Ω,1%,1/10W, 0805
0805 0805
301Ω,1%,1/10W, 0805
177289-503 177290-103 177289-203 177289-103
133625-1002
133625-4020 133625-3012
133625-1001
133625-1541 133625-5621 133625-2002
133625-7501 133626-1055
121243-1211222
133625-1000 133625-3013 133625-2672 133625-3010
40
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Resistors (Continued)
Reference
Description Part Number Reference
Designator
R46,54,73,209,233, 243,
R51,119,120,125, 126,138-141, 325,328,346,352,
R57,91,97,102,104, 111,133,157,160, 207,224,241,277, 279,304,317,358
R60,78 68.1KΩ,1%,1/10W, R67,83,237,301,
333,353 R68 15.0KΩ,1%,1/10W,
R69 45.3KΩ,1%,1/10W, R77,84 127KΩ,1%,1/10W, R80 26.1KΩ,1%,1/10W, R81 1.82KΩ,1%,1/10W, R82,131,154 17.8KΩ,1%,1/10W, R100,108 2.55KΩ,1%,1/10W, R105,234,244,316,
368,370 R114,357 200KΩ,1%,1/10W,
R115,134 73.2KΩ,1%,1/10W, R118,318,93 2.43KΩ,1%,1/10W, R122,142 4.75Ω,1%,1/10W, R132,145,161,276,
290,292,380,381 R144,323,338,343,
363 R146,147,149,150 255Ω,1%,1/10W,
57.6KΩ,1%,1/10W, 0805
61.9KΩ,1%,1/10W,
0805
100KΩ,1%,1/10W,
0805
0805
4.12KΩ,1%,1/10W, 0805
0805 0805 0805 0805 0805 0805 0805
47.5KΩ,1%,1/10W, 0805
0805 0805 0805 0805
Jumper,Chip,0805 133627
2.00KΩ,1%,1/10W, 0805
0805
133625-5762 133625-6192
133625-1003
133625-6812 133625-4121 133625-1502 133625-4532 133625-1273 133625-2612 133625-1821 133625-1782 133625-2551 133625-4752 133625-2003 133625-7322 133625-2431
133625-4R75
133625-2001 133625-2550
41
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Resistors (Continued)
Reference
Description Part Number Reference
Designator
R153 27.4KΩ,1%,1/10W,
0805
R156,159 Pot,Rotary,
10KΩ,10%,1/2W, Trim
R205,215,278,326, 327,347,349
R220,223 11.0KΩ,1%,1/10W, R230,250,303,324,
344 R235,245,330,354 23.7KΩ,1%,1/10W,
R238,308,309,313, 314
R239 5.11KΩ,1%,1/10W, R253,255,267,269,
312 R254,259,268,274 18.2KΩ,1%,1/10W,
R270-273 57.6KΩ,1%,1/10W, R280 56.2KΩ,1%,1/10W, R300 25.5KΩ,1%,1/10W, R302 6.49KΩ,1%,1/10W, R311 5.62KΩ,1%,1/10W, R329,342 9.09KΩ,1%,1/10W, R332,334,348,351 4.99KΩ,1%,1/10W, R337,359 7.15KΩ,1%,1/10W, R340 88.7KΩ,1%,1/10W, R341,375 38.3KΩ,1%,1/10W, R364 2.74KΩ,1%,1/10W, R366,367,369,372 10Ω,5%,1/4W,CF 121243-1211005
R373 196Ω,1%,1/10W, R500 Pot,Rotary,10kΩ,
150KΩ,1%,1/10W, 0805
0805
14.0KΩ,1%,1/10W, 0805
0805
4.75KΩ,1%,1/10W, 0805
0805
8.25KΩ,1%,1/10W, 0805
0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805
0805 10%
133625-2742 170042-103
133625-1503 133625-1102 133625-1402 133625-2372 133625-4751 133625-5111 133625-8251 133625-1822 133625-10R0 133625-5622 133625-2552 133625-6491 133625-5621 133625-9091 133625-4991 133625-7151 133625-8872 133625-3832 133625-2741
133625-1960 177299-103
42
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Capacitors
Reference
Description Part Number Reference
Designator
C1,2,29,123,200, 205
C3,7,23-25,35,47, 50,51,63, 89,93, 100,103, 116-120
C4,5,36,38,54,90, 102, 105,202,217, 301, 304,309,335, 348
C6,14,19,39,106, 107,112-115,121, 122
C8,11,15,18,20,27,3 2,46,53,57,62,65,76, 77,80,81,88,92,94­96,109,110,153,201, 204,206,208,216, 218,220,222,223, 226,238,300,307, 308,310,311,321, 324,501,512 C9,43,55,79,98,207, 219,312,322
C10,41,59,224,239 10pF,5%,50V,COG, C12,17,108,111,
242-245,339,340, 343,353,354,357, 358, 361,362
C13,314,315,329, 330
C16,320,331,355, 356,359,360
C21,26,49,52,70,74 680pF,5%,50V, C28 47uF,20%,16V,105, C30,33,34,37,40,56,
58,61,66,67,83,85 C31,72,73,78,82,
214,235,333,334, 349,352
C22,48,68,69,71,75 4.7uF,20%,35V,105, C42,303 .15uF,20%,50V,85,
.01uF,10%,50V, X7R,0805
47pF,5%,50V,COG, 0805
10uF,20%,35V,85, EL
100pF,5%,50V, COG,0805
.022uF,10%,50V, X7R,0805
1.0uF,20%,50V,105, EL
0805 .10uF,80%,25V,
Y5V,0805
.18uF,5%,50V,85, BOX
1000pF,5%,50V, COG,0805
COG,0805 EL
2.2uF,20%,50V,105, EL
.1uF,5%,50V,85, BOX
EL BOX
133623-103 133622-470
149948-100V
133622-101
133623-223
137126-1R0 133622-100
133624
137127-184 133622-102 133622-681 137126-470 137126-2R2 137127-104
137126-4R7 137127-154
43
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Capacitors (Continued)
Reference
Description Part Number Reference
Designator
C44 220uF,20%,25V,85,
EL
C45,60 100uF,20%,25V,85,
EL
C48,68,69,71,75 4.7uF,20%,35V,105,
EL
C64,319,327,337,33 8,350,351
C86 10uF,20%,25V,85, C87 .47uF,5%,50V,85, C104,203,341,342 22uF,20%,25V,85,
*C209,227,232, 237
C210,231 .01uF,5%,100V,85, C211,212,221,233 100pF,10%,50V, C213,234 .0047uF,5%,100V, C215,229,230,236,
246,247 C228,241 .0012uF,5%,100V,
C248-250 390pF,5%,50V, C302 .068uF,5%,63V,85, C306 1800pF,10%,50V, C313,317,325,326 .0015uF,5%,100V, C336,345 2200uf,20%,50V, C344,346,347 3300uf,20%,35V,
.22uF,5%,50V,85, BOX
EL BOX EL
0Ω,RES,Axial,.2W 139942 *See Note 1
BOX DISC,SL 85,BOX
.047uF,5%,63V,85, BOX
85,BOX COG,0805 BOX X7R,0805 85,BOX 105,EL 105,EL
149948-221E 149948-101E 137126-4R7 137127-224 149947-100E 137127-474 149948-220E
137127-103 137269-101 137127-472 137127-473 137127-122 133622-391 137127-683 133623-182 137127-152 144000-222H 144000-332V
Note:
1. These parts are screened as C209,227,232,237 on the PCB even though they are resistors.
44
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Diodes
Reference
Description Part Number Reference
Designator
D1,3,4,6 LED,10mA,2.5V,
Green,Vert
D2,5 LED,10mA,2.5V,
Grn/Red,Vert D10,11,13­17,22,24,25,27,29, 107,201,204,300, 301 D12,20,21,200,302, 309,310, D18,19,23,202,203 Zener,18V,1W,5%,
*D305 Rectifier,Bridge,
!
*D306 Rectifier,Bridge,
!
D307 Zener,16V,1W,5%,
Dual,SOT-23,BAV99 147239
Switching,75V,
300mA
1N4746
100V,1.0A
100V,6A
1N4745
Transistors
177280 177281
121501
116995-4746A
143952 *See Note 1 170214 *See Note 1
116995-4745A
Reference
Description Part Number Reference
Designator
Q1,2,202,300 BPLR,N,40V,200mA
,SOT23 Q3-7 BPLR,N,SOT23,
2SD2114K Q200 BPLR,P,60V,200mA,
TO-92 Q201 BPLR,N,30V,500mA
,TO-92 Q203,301,302 BPLR,P,40V,200mA,
SOT23 Q305 DARL,NPN,tip140 177310
Note:
!
1. 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.
146819 177294 119168 173476 148596
45
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Integrated Circuits
Reference
Description Part Number Reference
Designator
U1-4,10,15,200, 202-205,301
U5,7 Comparator, U6,13,14,300,303 OpAmp,Quad, U8 Mult/Demult,8CH, U9 Multiplexer,DIP-16, U11,12 Switch,Active, U201 Op-Amp,Dual, U302 Op-Amp,Single, U304,307 Power Amp,
U305 Voltage
U306 Voltage
Op Amp,Dual, DIP-8, RC4559
And/Or,NE572N DIP-14,NJM2059 DIP-16,4051 CD4052 SIP-8, BA3128N DIP-16,CN3280 DIP-8, CA3080 Mult-11, 45W,
TDA7396 Regulator,15V,
Pos.,TO-220 Regulator,15V,Neg.,
TO-220
108568 178894 144008 177308 147243 177292 133171 119834 177279
143858
143806
46
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Miscellaneous Components
Reference
Description Part Number Reference
Designator
*F1,2 Fuse,5x20mm,
!
630mA
*F3,4 Fuse,Time,400mA
!
*F5 Fuse,5x20mm,
!
*F6 Fuse,.60x.19, 250V,
!
FC1A,C1B,C2A,
Lag,Auto Slo Blo,10A Slo Blo, 3.0A
Fuseclip,5MM 178548
C2B,C5A,C5B J1,2,9,10 Connector,Rt.Ang.,
3 Pos.,Blk.
J3 Connector,Rt.Ang.,
5 Pos,Blk.
J4,5 Connector,RCA,
Dual,Female
J8,11 Connector,Rt.Ang.,
2 Pos,Blk.
J12 Connector,Rt. Ang.,
Beau
JP300 Jumper,22AWG,
Non-Insul, 10.0mm K1 Relay,24Vdc,4PDT 144017 P1 Harness,26
AWG,Freespace 6 P1A Connector,Header,
12 Pos. P2 Harness,24
AWG,Freespace 6 P2A Connector,Header,
8 Pos. P3 Harness,22
AWG,Freespace 6 P3A ,3B Connector,Header,
Inline, PCB, Mnt.,
2pos P4 Connector,Header,
Inline,PCB Mnt,
5 Pos. P5 Connector,Header,2
Pos. P6 Header,High
Current 8mm. pitch P7 Header,High
Current 8mm. pitch P9 Connector,Header,
5 Pos.
140346-0630 *See Note 1
177312-0400C1 *See Note 1
177311-10000 *See Note 1
135677-10 *See Note 1
177291-03 177291-05
177295 177291-02 177291-08
148242-100
181702-12 148591-12 177298-08 148591-08
177296 133220-02
133220-05
143963
178742-4 178742-4
148591-05
47
FreeSpace®6 Electrical Part List
PCB P/N 177300, Revision 1
Miscellaneous Components
Reference
Description Part Number Reference
Designator
S1-6,8,9 Switch,Slide,DPST,
Vertical S7 Switch,Slide,DPDT 176147 S10 Switch,DIP,SPST,
4 Pos. SW500 Switch,SPST,
Rocker TP1-10,500 Connector,Header,
Testjack,1 Pos,OR VR300 Varistor,Met Oxide
!
,275V,75 joule Note:
!
1. 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.
176148
148777-1 178108 171621-0103 170189
48
SCHEMATICS AND PCB LAYOUTS
The schematics and PC board layouts provided with this manual can be used for units built with PC board 177300, Revisions 0 and 1.
49
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 1, PCB IO1 Music Inputs (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
50
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 2, PCB IO1 Music Compressor (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
51
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 3, PCB IO1 Board Page Processor (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
52
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 4, PCB IO1 Board Music/Page Mixing (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
53
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 5, PCB IO2 Board Line Outputs (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
54
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 6, PCB IO2 Board Remote Volume (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
55
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 7, PCB IO2 Tone Control and Surface EQ (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
56
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 8, PA Board Dynamic EQ and Limiter Processor (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
57
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 9, PA Board Speaker EQ (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
58
Note: This schematic can be used for Revisions 0 and 1 of PCB 177300.
Sheet 10, PA Board Power Supply and Amp(PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
59
Note: These schematics can be used for Revisions 0 or 1 of PCB 177300.
Revision 0 Revision 1
Sheet 11, Remote Board (PCB 177300, Revisions 0 and 1)
FreeSpace
®
6 Business Music System
60
SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
Bose Corporation The Mountain Framingham, Massachusetts USA 01701
P/N 181816 01/96: Rev.0
FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008
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