Bose-301-Serie-III-Service-Manual 电路图 维修手册.pdf

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1、Service Manual 301 SERIES III DIRECT/REFLECTING SPEAKER SYSTEM SPECIFICATIONS 1992 Bose Corporation Transducers:Cabinet: 1-8(20 cm) wooferBlack, white, or walnut-grained finish 2-3(7.6 cm) tweeters Nominal Impedance:Speaker Dimensions: 8 Ohms10.5H x 17W x 9.5 D (27 H x 43 W x 24 D cm) IEC Power Rati

2、ng:Shipping Weight Min: 10 Watts Per Channel34 lbs. (15.5 kg) Per Pair Max: 75 Watts Per Channel BOSE 301 SERIES III TECHNICAL DESCRIPTION The BOSE 301 Series III System is an economical way to enjoy the legendary spatial realism of a Direct/Reflecting system. This system creates a natural balance o

3、f reflected and direct sound that conventional speaker designs cant match. The result is lifelike spaciousness that approaches the realism of a live performance. Even sound distribution also enables the listener to sit or stand anywhere and still hear the same volume and blend of musical instruments

4、. This achievement is also aided by three high performance drivers in each cabinet: one 8 woofer and two 3” tweeters. The tweeters are arranged in a three-dimensional Free Space Array which is mounted slightly away from the cabinet face. One tweeter is aimed inward toward the center of the listening

5、 area. The second tweeter is aimed outward so that its output is reflected off the side wall. This arrangement provides the excellent spatial characteristics of a Direct/Reflecting system. The 301 system employs the BOSE Dual Frequency crossover network. The crossover provides a smooth transition fr

6、om low to high frequencies by sending sound to all the drivers over nearly a full octave. The result is a clear definition of each instrument and voice. Additionally, the system incorporates slot-port technology which reduces port noise and produces cleaner, more natural bass. The sum of all these u

7、nique features makes the 301 Series III speaker capable of reproducing the wide dynamic range demanded by todays advanced recordings without strain or loss of clarity. TEST PROCEDURES NOTE: Before performing any tests,remove the grille assembly. Refer to the Grille Assembly Removal procedure. 1. Woo

8、fer Rub and Tick Test A. Connect a sine wave oscillator to a power amplifier. Adjust the frequency of the oscillator to 10 Hz and the amplifier output to 8 Vrms. Connect the amplifier output to the input terminals of the 301-III speaker (see Figure 1). No extraneous noises such as rubbing, scraping

9、or ticking should be heard. 1 NOTE: To distinguish between normal suspension noise and rubs or ticks, displace the cone on the woofer slightly with your fingers. If the noise can be made to go away or get worse, it is a rub or a tick and the woofer should be replaced. If the noise stays the same, it

10、 is normal suspension noise and the woofer is fine. Suspension noises will not be heard with program material. 2. Woofer Sweep Test A. Sweep the oscillator from 10 Hz to 3 kHz using the 8 Vrms signal. There should not be any loud extraneous sounds. If there are any loud buzzes or distortion, replace

11、 the woofer. NOTE: There should not be any buzzes or rattles from within the speaker cabinet. Redress any wire or component that buzzes. 3. Tweeter Sweep Test A. Reduce the amplifier output to 4.0 Vrms and continue sweeping from 3 kHz to 15 kHz. If one of the tweeters is buzzing or distorting, repla

12、ce it. 4. Air Leak Test A. Using the 8 Vrms signal, set the oscillator frequency to 45 Hz. For at least 5 seconds, listen for air leaks around the woofer,terminal cup and tweeter mounting brackets. If there is a whooshing noise around the woofer, re-position the woofer gasket behind the woofer to ma

13、ke an airtight seal. If there are any similar noises around either of the tweeter mounting brackets or the terminal cup, make sure that these items are securely fastened to the speaker assembly. 2 Test Connections 301 III Speaker +- Audio Signal Generator Power Amplifier InputOutput Speaker - + -+ F

14、IGURE 1 5. Woofer Phase Test NOTE: Supply voltage should only be momentarily applied to the speaker input terminals to avoid possible damage to the speaker. A. Set a DC power supply to 8 volts. To ensure that the woofer is connected in phase, connect the positive lead of the supply to the positive (

15、+) speaker input terminal and the negative lead to the negative (-) input terminal. The woofer should move outwards with the application of the supply voltage.This ensures that the woofer and speaker input terminals are wired in phase. See Schematic Diagram, Figure 2. 6. Tweeter Phase Test A. Remove

16、 4 screws and lift the woofer carefully away from the speaker cabinet in order to access the terminal cup. Check the wiring on the terminal cup and on both sets of tweeter terminals against the schematic in Figure 2. This ensures that both tweeters are wired in phase. REMOVING THE GRILLE ASSEMBLY A.

17、 The grille assembly is held in place by 6 grille fasteners. To remove, CAREFULLY pull the assembly away from the speaker (it should lift away easily). REPAIR PROCEDURES 1. Replacing the Woofer A. Remove the 4 screws holding the woofer in place. (Refer to Figure 3 for an exploded view of the speaker

18、 assembly). Lift the woofer out and cut the wires connected to the woofer terminals as close to the terminals as possible. Strip the wires and connect to the replacement woofer. Make sure that the yellow wire is connected to the positive (+) terminal and the green wire is connected to the negative (

19、-) terminal of the woofer. Remount the woofer to the cabinet using the 4 screws. Repeat the woofer test procedure. 3 FIGURE 2 Schematic Diagram 2. Replacing the Tweeters NOTE: The positive terminal of each tweeter is marked with a red dot. A. The upper and lower tweeters are mounted on brackets. Ref

20、er to Figure 3. Remove one (1) screw which secures either tweeter to its bracket. Lift the tweeter away from the bracket and cut the wires connected to the tweeter as close to the tweeter terminals as possible. Strip the wires and connect to the replacement tweeter. The tweeters should be wired as f

21、ollows: (1). Upper Tweeter-Make sure that the red wire is connected to the positive (+) terminal and the grey wire is connected to the negative (-) terminal. (2). Lower Tweeter-Make sure that the grey wire is connected to the positive (+) terminal and the black wire is connected to the negative (-)

22、terminal. REMOUNTING THE GRILLE A. The grille can only be remounted one way (see Figure 3). Align the grille feet with the 6 grille fasteners. Press in lightly until the grille feet are engaged by the grille fasteners. The grille assembly should be flush with the front and side of the cabinet. The n

23、ameplate should be located near the bottom side of the grille. See Figure 3. 4 FIGURE 3 Main Assembly Part Drawing 5 FIGURE 4 Carton Parts Drawing 6 301 Series III Parts List (Figure 3) 7 Item Number DescriptionPart NumberQty. Per Speaker Assy. See Note 1 Grille Assembly-Dark Brown 143767-11 Grille

24、Assembly-Black 143767-31 Grille Assembly-White 143767-41 2 Nameplate-Gold/Brown Bkgnd. 132545-041 Nameplate-Clear/Black Bkgnd. 132545-011 3 Trim Strip-Black 143770-11 Grille Clip (Not Illustrated) 1207162 4 Woofer-8 or 1207131 Woofer-8 181870-001 Replace in pairs 10/2002 5 Screw-HIRS,8-10 x3/4,PAN,X

25、RC/SQ 137527-1210 6 Woofer Gasket 1207151 7 Grille Fastener 1179956 8 Tweeter 3 130714 2 Alt124618 9 Tweeter Mounting Bracket 1285012 10 Screw-Machine,8-32x1/2,Hex Washer Hd. 121441-082 11 Terminal Cup Connector 1207111 12 Screw-6-10 x1/2,PAN,XRC/SQ 138897-084 Crossover Parts List (Figure 3) NOTES 1

26、. C1 and R1 must be used in the combinations shown above in order to achieve the proper frequency response of the loudspeakers. 2. This part is not normally stocked as a service part. Symbol or Item Number DescriptionPart NumberQty. Per Speaker Assy. See Note C1 Capacitor-Film,5%,50V,3.4F 10682511 R

27、1 Resistor-WW,10%,5W,7.5 125605-7R511 C1 Capacitor-Film,5%,50V,3.7F 10705511 R1 Resistor-WW,10%,5W,6.2 125605-6R211 C1 Capacitor-Film,5%,50V,3.0F 10413011 R1 Resistor-WW,10%,5W,9.1 125605-9R111 C1 Capacitor-Film,5%,50V,2.4F 10413111 R1 Resistor-WW,10%,5W,13.0 125605-13011 RT1 Mini-Lamp 1178051 A Foa

28、m Tape 118223N/A B Foil Tape 103597N/A2 C Glass Wool 103075N/A2 D Connector,Terminal,Wirewrap 1180083 E Screw-TAPP,8x3/8,HEXW,SLOT 103802-063 8 301 Series III Parts List (Figure 4) Item Number DescriptionPart NumberQty. Per Carton See Note 1 Literature Kit (N. America) 143754-11 Literature Kit (Euro

29、pe) 143754-21 which consists of: A Owners Manual 1437551 B Polybag 1033511 C Warranty Card (N. America) 1292871 Warranty Card (Europe) 1321171 D Envelope (N. America) 1230011 Envelope (Europe) 1284501 E All Products Brochure 1414781 (N. America) F Warranty Service List 1227661 (N. America) G Express

30、 Music Catalog 1458911 (N. America) 2 Packing,EPS 1299312 3 Polybag (N. America) 1065952 Polybag (Europe) 1145222 4 Carton (Generic) 143772N/A Carton (Mexico) 145375 N/A Carton (Europe) 143773N/A 9 NOTES FOR FUTURE REFERENCE 10 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE Bose Corporation The Mountain Framingham, Massachusetts USA 01701 9/92: REV.0 P/N 149358FOR TECHNICAL ASSISTANCE PARTS ORDERING, CALL 800-367-4008