Bose-302-A-Service-Manual 电路图 维修手册.pdf

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1、2006 Bose CorporationService Manual Bose 302A Loudspeaker (Commercial Indoor/Outdoor 70V/100V Distributed Applications) Part Number 257475 Rev. 02 RadioFans.CN 收音机爱 好者资料库 2 CAUTION: The Bose 302A loudspeaker contains no user serviceable parts. To prevent warranty infractions, refer servicing to warr

2、anty service centers 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 CEN- TER OR OWNER OF THE BOSE PRODUCT, AND SHALL NO

3、T BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. WARRANTY INFORMATION The Bose 302A loudspeaker is covered by a five year transferable limited warranty. PRODUCT DESCRIPTION The Bose 302 A loudspeaker is designed for surface-mount commercial 70V/100V distributed indoor and outdoor applications. Designe

4、d to be mounted on a wall, ceiling or overhang, the 302A loudspeaker is packaged with mounting brackets that contain a 70V or 100V multi-tap (12W, 25W, 50W and 100W) transformer. Each 302A loudspeaker contains one 5.25” environmentally resistant woofer in a two-chamber configuration and two 2.5” env

5、ironmentally resistant Twiddler drivers vertically stacked and angled for maximum horizontal dispersion. Contents Product Description .2 Specifications.3 Disassembly/Assembly Procedures . 4-5 Transformer Wiring .5 Figure 2. Transformer Wiring.5 Figure 1. Wiring Diagram .5 Test Procedures .6 Figure 3

6、. Schematic Diagram .6 Part List.7 Figure 4. Exploded View.7 Packaging Part List.8 Figure 5. Packaging View .8 Table of contents .9 RadioFans.CN 收音机爱 好者资料库 3 SPECIFICATIONS Transducers:One 5.25 environmental woofer per enclosure Two 2.5 environmental resistant Twiddler TM drivers per enclosure Cross

7、over:250Hz 10% at 6dB/octave Low frequency cutoff:-3dB at 75Hz 5Hz Impedance:70V: 25 Ohms at 100W tap setting 100V: 50 Ohms at 100W tap setting Power Handling:100W continuous per IEC 268-5 Transformer:Multi-tap 70V/100V (12W, 25W, 50W,100W taps) Frequency range:75Hz to 16 kHz Sensitivity:82dB SPL at

8、 1W, 1M (pink noise) Maximum Acoustic Output:102dB SPL at 1M (pink noise) 102dB SPL at 1M (IEC noise) Dispersion:(-6dB point, average, 1-4 kHz) Horizontal 178 o Vertical 93 o External Dimensions:Single speaker: 13.4H x 5.7W x 9.0D (34 x 14.5 x 23) cm Packed system: 16H x 17W x 14.75D (40.6 x 43.2 37

9、.47) cm Weight:Single speaker: 7.75 lb. (3.5 kg) Packed system: 32.2 lb. (14.6 kg) RadioFans.CN 收音机爱 好者资料库 4 1. Grille and Baffle Removal 1.1 Grasp the edge of the grill (10) and pull it off. 1.2 Remove the six screws (17) that secure the baffle to the cabinet and then pull off the baffle. 2. Grille

10、 and Baffle Replacement 2.1 To prevent air leaks, apply a new woofer mount gasket (13). To prevent wire buzzes, insert the wires into the cabinets wire chan- nel. Line up the baffle so that the baffles woofer mount fits into the groove in the cabinet. Replace the six screws (17) that secure the baff

11、le to the cabinet. 2.2 Align the grille (10) with the cabinet so that the logo (14) is over the TwiddlerTM drivers (2). Press the grille into place. 3. Twiddler Removal. 3.1 Perform procedure 1.1 and then remove the four screws (16) that secure the Twiddler driver (2) to the cabinet. 3.2 Lift out th

12、e Twiddler driver, make a note of the wiring configuration and cut the wires as close as possible to the wire terminal. 4. Twiddler Replacement 4.1 Referring to the note taken in 3.2, attach the wires to the Twiddler driver (2). 4.2 Line up the Twiddler driver in the cabinet and replace the four scr

13、ews (16) that secure it in place. 5. Woofer Removal 5.1 Perform procedure 1. 5.2 Make a note of the wiring configuration and then cut the wires as close as possible to the woofers (1) wire terminal. 5.3 Remove the four screws (16) that secure the woofer to the baffle. Lift out the woofer. 6. Woofer

14、Replacement 6.1 To prevent air leaks, use a new woofer gasket (15) and woofer mount gasket (13). Line up the woofer (1) in the baffle so that the wire terminal is facing toward the Twiddler drivers (2). Replace the four screws (16) that secure the woofer to the baffle. 6.2 Referring to the note take

15、n in procedure 5.2, attach the wires to the woofer. 6.3 Place the foam tape woofer mount gasket (13) around the edge of the woofer mount where it contacts the cabinet. 7. RLC Circuit Component Removal 7.1 Perform procedure 1. 7.2 Remove the capacitor (5), resistor (6) or inductor (4) by cutting its

16、leads. Remove the screw (16) that secures the inductor to the cabinet and cut the inductors leads. 8. RLC Circuit Component Replacement 8.1 Replace the capacitor (5), resistor (6) or inductor (4) by soldering its leads to the lug from which it was removed. Replace the screw (16) that secures the ind

17、uctor to the cabinet. Refer to Figures 1 and 3. 9. Crossover Capacitor Removal 9.1 Perform procedure 1. 9.2 Remove the four screws (16) that secure the Twiddler driver panel (11) to the baffle. Pry off the panel. 9.3 Cut the wires as close as possible to the terminals of the capacitor (3). DISASSEMB

18、LY/ASSEMBLY PROCEDURES (Refer to Figure 4) 5 The transformer is set at the factory for 70V, 100W operation. To change from 70V to 100V operation, replace the orange wire with the yellow wire (orange wire 70V, yellow wire 100V). To change from 100W output, replace the red wire with: Green for 50W out

19、put Violet for 25W output Blue for 12.5W output Caution: Do not remove or replace the black ground wire. To prevent wires from shorting, all wires that are not connected must be covered with shrink tube or a wire nut. Figure 2. Transformer Wiring DISASSEMBLY/ASSEMBLY PROCEDURES (Refer to Figure 4) B

20、oss 1 Boss 3 Red wire (-) Woofer (-) Terminal Green wire (-) Twid 2 Figure 1. Wiring Diagram 10. Crossover Capacitor Replacement 10.1 Connect the leads of the capacitor (3) to the wires and solder the connections. The capacitor is wired in series with the woofers (1) positive terminal and the Twiddl

21、erTM drivers (2) positive terminal. Refer to Figure 1 and 3. 10.2 To prevent air leaks, use a new Twiddler driver panel (11) and gasket (12). Line up the Twiddler panel with the cabinet and replace the four screws (16) that secure it to the baffle. TRANSFORMER WIRING BLK RED WHITE ORANGE JUMPER WIRE

22、S BLK RED GREEN VIOLET BLUE YELLOW 70V 100V 50W 25W 12.5W OUTPUT INPUT PARALLEL INPUT 100W Wiring Schematic FromToWire Twiddler driver 1 (-) Twiddler driver 2 (+) Gray Twiddler driver 1 (+) Capacitor (item number 3) Yellow Capacitor (item number 3) Woofer (+)Black Twiddler driver 2 (-) Lug at boss 3

23、Red Woofer (+)Terminal (+)Yellow Woofer (-)Terminal (-)Green Terminal (-)Lug at boss 1Green 6 TEST PROCEDURES Test setup note: Disconnect the input of the speaker from the transformer for procedures 1-5. 1. Woofer Rub and Tick Test 1.1 Apply a 1 Vrms, 10Hz signal to the speaker input terminal. No ex

24、traneous noises such as rubbing, scraping or ticking should be heard. Note: To distinguish between normal suspen- sion noise and rubs or ticks, slightly displace the cone of the woofer with your fingers. If the noise can be made to go away or get worse, it is a rub or tick and the woofer should be r

25、eplaced. If the noise stays the same, it is normal suspension noise and the woofer is okay. Suspension noise will not be heard with program material. 2. Air Leak Test 2.1 Apply an 8 Vrms, 65Hz signal to the speaker input terminal. 2.2 Listen for air leaks around the cabinet seams, the Twiddler drive

26、r panel, and the woofer and Twiddler driver gaskets. Reposi- tion or replace any gasket that is found to leak. Repairs made to the cabinet seam should not be visible from the exterior of the speaker. Note: A whooshing noise from the ports at approximately 65Hz and 185Hz is acceptable (port tuned fre

27、quencies). 3. Twiddler Driver Phase Test 3.1 Check the wiring of the Twiddler driver against Figures 1 and 3. 4. Sweep Test 4.1 Apply an 8 Vrms, 10Hz signal to the speaker input terminal. 4.2 Sweep the signal generator from 10Hz to 5 kHz and then back to 10Hz. 4.3 Apply a 3 Vrms, 5 kHz signal to the

28、 speaker input terminal. 4.4 Sweep the signal generator from 5 kHz to 15 kHz and then back to 5 kHz. 4.5 Listen for buzzes, rattles or other noises. Redress any wire that buzzes; replace the woofer or Twiddler driver if they are found to be defective. 5. Woofer Phase Test 5.1 Observing polarity, mom

29、entarily apply 8 VDC to the speaker input terminal. Note: To avoid damaging the speaker, only momentarily apply the DC voltage. 5.2 The woofer should move outward with the application of the DC voltage. 6. Transformer Test 6.1 Connect the output of the transformer to the speaker input terminal. 6.2

30、Apply a 35 Vrms, 50Hz signal to the input of the transformer. 6.3 Sweep the signal generator from 50Hz to 5 KHz. Listen for clean undistorted audio output. + - + - Gray Twiddler driver 2 Twiddler driver 1 Red 15uF 1.5mH 11 Ohm Woofer GreenGreen YellowYellowYellow 22uF + - Figure 3. Schematic Diagram

31、 7 MAIN PART LIST Figure 4. Exploded View 425 5 23 6 21 Red wire (-) Woofer (-) Terminal Green wire (-) Twid 2 Item Number Description Part Number Qty Note 1 WOOFER, 5.25, ENVIRONMENTAL 289780-001 1 2 TWIDDLERTM DRIVER, ENVIROMENTAL 289783-001 2 3 CROSSOVER ASSY, 22UF 291731-002 1 4 INDUCTOR, 1.5mH,

32、 0.8 OHM, FERRITE 147196 1 5 CAPACITOR, BIPOLAR, 15uF 291087-001 1 6 RESISTOR, WW, 5W, 10%, 11.1 OHM 125605-110 1 7 NUT, INSERT 250818 2 8 CONNECTOR, ENVIRONMENTAL, BLACK 250815-01 1 9 CONNECTOR, ENVIRONMENTAL, RED 250815-02 1 10 GRILLE, ALUMINUM, BLACK GRILLE, ALUMINUM, WHITE 250804-11 250804-12 1

33、11 PANEL, SEALING, TWIDDLER DRIVER 250820 1 12 FOAM TAPE GASKET 250807 1 13 FOAM TAPE GASKET, WOOFER MOUNT 250808 1 14 LOGO, BLACK CABINET LOGO, WHITE CABINET 250806-03 250806-04 1 15 GASKET, 134mm, RD, ADH BACKED 290315-001 1 16 SCREW, TAPP, 8-11X.5, PAN, ASY, SQ 290306-08 17 17 SCREW, TAPP, 8-11X1

34、.0, PAN, ASY, SQ 290306-16 7 18 GASKET .725 ROUND 293356-001 2 19 SCREW, TAPP, 8x3/8, HEX W, SLOT 290304-06 2 20 CONN, TERM, WIRE WRAP, 1 POS, FEM 118008 2 21 TAPE, FOIL 255912 2 22 TAPE, FOAM 255911 1 23 TAPE, FOAM 118223 2 24 TAPE, FILTER FOAM 255910 1 25 SCREW 290305-16 1 8 3 7 6 4 5 1 8 9 10 2 P

35、ACKAGING PART LIST Figure 5. Packaging View Item Number Description Part Number Qty Note 1 BRACKET/TRANSFORMER, 70V/100V BLACK BRACKET/TRANSFORMER, 70V/100V WHITE 255901-01 255901-02 1 pkg of 2 2 70V/100V TRANSFORMER ONLY 254426 2 3 HARDWARE KIT, ENV, 4-PACK, BLACK HARDWARE KIT, ENV, 4-PACK, WHITE 2

36、90307-003 290307-004 1 4 BAG, POLY, HDPE, 18X26, 1 MIL 255354-001 1 4 5 PACKING, END CAP, TOP 250809 1 6 PACKING, END CAP, BOTTOM 250810 1 7 CARTON, RSC 255902-001 1 8 PACKAGING, CREASE SHEET 255903 1 9 INSTALLER GUIDE 255917 1 10 COMMITMENT LETTER 251001 1 9 Date Revision Level Description of Chang

37、e Change Driven By Pages Affected 8/02 00 Document release revision 00 Service manual release All Unknown 00 to 01 ECN 33972 and 33783 6,7 02/06 01 to 02 Added RoHS part numbers This product is now built with RoHS compliant parts. 6,7 ? SERVICE MANUAL REVISION HISTORY Specifications and Features Subject to Change Without Notice Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N 257475 REV. 02 2/2006 For Technical Assistance or Part Orders, Call 1-800-233-4408