Bose-802-Service-Manual 电路图 维修手册.pdf

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1、-BIISE7802 Professional Loudspeaker System SPECIFICATIONS GENERAL The BOSE802Professional Loudspeaker System consists of two speaker enclo- sures (cabinets) and a separate Active Equalizer. Each cabinet contains eight identicalhigh-efficiency,fUll-range drivers. The drivers each have an im- pedance

2、of one ohm and are wired in series to give a system impedance of eight ohms. The cabinet also includes an Impedance Control Capacitor which controls the system impedance at high frequencies,reducingtheamplifier power requirements of the system. Each driver has a molded, high-impact polymerframethatr

3、educesflux leakage tomaintainhighefficiency. The driver voice coils are made of flat aluminum ribbon,edge-wound on an aluminum bobbinforhigh efficiency and high power handling ability. Each driver has a 12-ounce ceramic magnet for high efficiency and resistance to demagnetization. Each enclosure inc

4、orporates two Reac- tiveAirColumnsthatfunctionto reduce driver cone excursion at very low frequencies. This allows the 802 to producehighoutputlevelsatdeep bass frequencies with a minimum of distortion. 1979 Bose Corporation The cabinet is composed of mica-filled, high-densitypolyethylenestructural

5、foam. This reinforced polymer material combines light weight, high strength, and impact resistance for ruggedness in transportation. The 802-E Equalizer adjusts the spec- trum of the audio signal, permitting the 802 system to provide broad,flatfre- quency response without using woofers, horns, or cr

6、ossover networks that cause audible coloration. The Equalizer must be used withthe system to achieve satisfactory performance. EQUALIZER Dimensions: 25.4 cm (10)Wx 12.7 cm(5) 0 x4.8 cm(1-7/8)H Weight: .738 Kg (1.6 Ibs.) Input Impedance: 4 K ohms (balanced inputs), 50 K ohms (unbalanced inputs) Outpu

7、t Level: 5 volts into 2 K ohms or higher, 3.5 voltsinto600 ohms. Gain: (See Frequency Response Graph) 802-EEQUALIZERFREQUENCYRESPONSE -lOHt30 4060100ZOO400600lkHt2:3468 1020 FREOUENCY Power Requirement: 3.5 Watts, 110 V AC or 220VAC (not available inU.S.A.) SPEAKERSYSTEM Dimensions: 41 cm(16-1/8)x51

8、 cm(20-1/4) x34 em(13-1/4)with cover Weight: 16 Kg (36 Ibs.) Driver Complement: 84-1/2full-range drivers Impedance: 8 ohms Magnet Weight: 2.7 Kg (96 ounces) total Power Handling: 160 Watts continuous Amplifier Power: 300 Watts maximum Figure 1SPEAKERSCHEMATICFigure 2DRIVERPLACEMENT (FRONT VIEW) I.DI

9、SASSEMBLY PROCEDURE 1. GRILLE: Remove the two clinchnutsand grille retainer holding the grille in place.Liftthe grille by pulling from the hole in the grilles center. Carefully remove the grille and place in a safe location until needed for reassembly. 2. BACK PANEL -Remove drivers two (2) and three

10、 (3) to obtain access to the internal rear panel connections. This will provide access for repairs associated with the internal connections of the back panel. 3. IMPEDANCE CONTROL NETWORK -Remove drivers two (2) and three (3) to obtain access to the impedance control assembly. This will allow a cont

11、inuity check of the bulbcircuitand a check of the wiring and impedance control capacitor. II.TEST PROCEDURE 1. CONTINUITY CHECK -An open driver may be detected by using an ohmmeter and checking continuity. Insert a phone jack in the rear of the speaker and check continuity by carefully penetrating t

12、he black cement covering the flexible conductor on the surface of each conewithan ohmmeter lead. Check continuity between each driver and the speaker terminals until the open driver is detected. See Figures 1 and 2. 2. POWER CHECK -Using a 50-watt (20 volt) sine wave signal, sweep the range between

13、40 and 200 Hz. Check for rattles, buzzing or voice coil rubbing. Reduce theoutputto 5 watts (6.5 volts), and continue to sweep the range between 200 and 16,000Hz. Note: When us- ing a sine wave signal on the 802 Speaker System, do not operate the speaker below 80 Hz at levels greater than 20 watts (

14、12.6volts) as possible damage to the drivers may occur. 3. PHASING CHECK -Using a 6- to 20-volt battery or DC power supply, check that all speakers are in phase (moving together). Connect the positive portion of the power supply to thetipterminal of the phone jack and the ground connection of the po

15、wer supply to the sleeve terminal of the phone jack. This will produce an outward motion of all drivers. See Figure 1. 4. IMPEDANCE CONTROL NETWORK -Check the bulb circuitry and wiring of the impedance control circuitry by using an 8 kHz sine wave signal at 2V RMS1%. Insert a 0.5 ohm1%resistor in se

16、ries with the ground lead for the speaker. A voltage drop of 60-77 mV RMS should be measured across the resistor. If incorrect, check the bulb(s) and capacitor. III.SERVICE NOTES 1. When replacing 802 drivers, be certain to use the 802 driver gasket (Part number 110943)to properly seal the driver to

17、 the 802 cabinet. 2. Check the coupling control inserts for dirt or dust. If they are clogged, replace them with the spares provided in the top cover of the 802 speaker. Extra coupling control inserts may be obtained through the BOSE Customer Service Department or your BOSE Professional Products Dea

18、ler. One of the unusual features of the 802 is the use of the coupling control inserts. These are polyesterfuzzdiscs which are installed in the ReactiveAirColumns. Their purpose is to decouple the drivers from one another near the resonant frequency of the system. Afterprolonged use, these inserts a

19、nd their gauze covers may become plugged with dirt or dust, causing them to lose their effec- tiveness. This results in abuzzingsound during heavy bass passages. The inserts may be easily removed for inspection or replacement (two spare sets of inserts are supplied with the 802): (See Figure 3): a.

20、Remove the two clinch nuts by rotating them counter-clockwise. b. Remove the grille retainer and the grille. c. Remove the two column extenders by pinching both release tabs and pulling gently. Do not use sharp tools as they could damage thethinseal lip. d. Remove the snap caps from the column exten

21、ders by prying themoffgently with your fingernails. e. Examine the coupling control inserts fordirtor dust. If they are clogged, replace them with the spares provided. f. Wash the gauze-covered ends of the column extenders by swishing them around in warm, soapy water. Rinse in clear water and allow

22、them to air-dry thoroughly. g. Reassemble the system by reversing the above procedure, pushing the column extenders in firmly until they snap into place. Be certain to center the grille retainer before tightening the clinch nuts. Tighten the clinch nutsfirmlybutnotexcessively. h. Extra coupling cont

23、rol inserts may be obtained through the BOSE Customer Service Department or your BOSE Professional Pro- ducts Dealer. This is the only periodic maintenance required by the 802 system. CLINCH NUTS-_ GRILLE RETAINER_-Il GRILLE PANEL_-1111.2: COLUMN EXTENDERS COUPLING CONTROL INSERTS-_I - .:=:. -=-.-.,

24、.:=-: SNAP CAPS PARTSLIST 802 EQUALIZER PART SYMBOLDESCRIPTIONNUMBER PART SYMBOLDESCRIPTIONNUMBER Miscellaneous Chassis109254 ResistorsCover 109255-./ R1,2.25W 100OHMS5%107170-101 LineCord115/100V111672 R3.25W 10KOHMS5% 107170-103 LineCord220V113608 R128, 328.50W 510OHMS5%102942-511 StrainRelief1063

25、46 R121, 321.25W 1KOHMS5%107170-102 T1Transformer (220V) (PCB #112991) 114998 R120, 320.25W 1.2KOHMS5%107170-122 T1Transformer (220V) (PCB #116994) 116942 B113, 313.25W 470OHMS5%107170-471 T1Transformer (115V)110385 R124, 125, T1Transformer (110V) (PCB #112991) 111060 324, 325.25W 18KOHMS5%107170-18

26、3 T1Transformer (110V) (PCB #116994) 117721 R122, 126, S1PowerSwitchDPDT108425-5 322, 326.25W 22KOHMS5%107170-223 S2SlideSwitchDPDT110695 R118, 119, PhoneJackInput104877 318, 319.25W 27KOHMS5%107170-273 PhoneJackOutput102626 R112, 312.25W 5.6KOHMS5%107170-562 XLRConnector106894 R114, 314.25W 10KOHMS

27、5%107170-103 Pushbutton106677-3 R123, 323.25W 160KOHMS5%107170-164 PanelMountLEDAssy111558 R111,311.25W 24KOHMS5%107170-243 R101, 103, Semiconductors 301, 303.25W 1MOHMS5%102939-105Z1BridgeRectifier110696 R107, 307.25W 681OHMS1%104095-68100101-104DiodeIN414811404 R108, 308.25W 1.24K OHMS1%104095-124

28、101ZenerDiode24V 1W110697 R110, 310.25W 1.82K OHMS1%104095-1821U101,301I.C.OPAMP R109, 309.25W 3.92KOHMS1%104095-3921102,3024559108568 R104, 105, 012N3906102426 127, 137, 022N3904102432 304, 305.25W 2.00KOHMS1%104095-2001 R106, 306.25W 51.1KOHMS1%104095-5112 802 LOUDSPEAKER R115, 315.25W 75KOHMS50/0

29、107170-753 Column Extender (Short port)121808 -.-/ Snap Cap111556 Capacitors Grille Retainer (grille still)121831-01 C1CERDISC.0047fJ.F1.4KV103447 Coupling Control Insert (Fuzz Buzz)109446 C2, 7, 8CERDISC.01fJ.F100V103730 Grille109467-18 C3,4ELCTLC470/500fJ.F25V110704 Driver Assembly121777 C5,6ELCTL

30、C10fJ.F, 25V106777 Gasket, Speaker111624 C112, 117, Thumbscrew, M8114849 312, 317Film.0012/-IF100V5%110913-122 LiteratureKit 109463 C118, 319CER DISC 270 pF 100V5%106767-271 Fuse, 3 AG, 4amp(120V)104715-400 C106, 107, Fuse5 x 20 mm 4 amp (International)109494-400 108, 306, FuseCap (120V) 109484 307,

31、 308Film0.15/-IF100V5% 106510-154 FuseCap (Universal) 109493 C110, 310Film.0033/-IF100V5%106510-332 Capacitor10/-l10%75 VDC110311 C111, 115, Lamp12V (4) 109211 116,311, Lamp 24V (1) 111431 315, 316Film.047/-IF100V5%106510-473 PhoneJack1191959 C101, 102, XLRConnector 109486 119, 301, FuseholderBody10

32、9485 302, 319ELCTLC 25/-IF25V104560 TinnermanClip 109481 C103, 104, AudioCables 102643 113, 114, FrequencyContouringAssy.111361 303, 304, AccessoryKit 110707 313, 314CER DISC 0.1/-IF100V.106881 CartonKit 109459 Pinch Clinch (Clinch Nuts)123174 Latch 109480 ThumbscrewClips109483 R IO ,6 ,./. OU T PU

33、T Cl-4ANNE.L. OVT P U C.-ANN e t.Z. R32iO 22K R /2 Ci UK TPH3W t P I4 + 1318 C.9 .SCHJ2.5.F S iC2.S V TPI1 C lI ? 0 0 12. C.31 1 0012. TPI CIISCII 1Z.120.041.04 1.2 - R. 12. ,- CIII . 0 47 TPIS c.IOe . 15 RII 470 ello 1.02.1. iii:IO 3.92.K .-/. . INPUT C .lANNE. I LED INOICATO v + .-.,_,7OUTPUT 8 6I

34、NvERTING INPUTB 5NON-INVERTING INPUT 8 TOP VIEW OUTPUT A INVERTING 2 INP UT A3 NONlNVERTING INPUT Av-4 C4 500 2 SV 5. TEST PROCEDURE:0 TO AN EQUALIZER INPUT OdB is REFERENCEING A650Hz SINE VOLT AGE OF200STSIGNALS HIGH ER WAVE. DO NOT UOVERLOAD THAN 400mV AS POSSIBLEY CAN OCCUR. (DEPENDING ONFgigEh5V

35、OLTS INTO MAXIMUMOUTUVOLTSINTO 2 KOHM OR 600 OHMS OR 5.Hz AND 16 kHz. HIGHER) OCCUR S AT 60TICS FOR EACH TEST 6. RESPONSECHARA:(EQUALIZER GAIN POINT ISSHOdBGAIN POSITION SWITCH SETLAST GRAPH) EXCEPT FORFRS S,SET IN OdB GAIN 7 EQUALIZER GAIN . POSITION FOR ALL UNITS. 8. EARLY 802EO Q:FOSCILLATION HAV

36、E THE PITIONS THE UNDER LOW LINECONDLLY DESCRIBED AS A OSCI LLATION ISGEiTOR DISTORT ION TO HIGH - PITCHED WH CETRI,S2E100 CHANGE R3 FROM3.3kMOD IFICATIONS 9 SHADED COMPONENTSELSOF 802 EQUALIZER. . ADDED TO LATERMgAGESTABILAZATION THESE WERE FOR V AND INPUT PROTECTION. CI . 0041 IAK.v I -l B I L_ -l

37、 rIII il I220Vl K.2. Iyp.R-I36 , I4 P2 Pl. ugONCHANNEL 2 OF 3 DC VOLTAGES ARE . THE SCHEMATIVCERSION INFORMATION 4 VOLTAGE CON . 120 - 240VACQUALIZER MANUFACTURED THE BOSE 802 ES NOTCON- FOR 120VACOPERA6gRAT10NEXCEPT BY VERTIBLE TO 240VANCONTACTTHE FACTORYMODSFEINSTRUCTIONS FACTORY FOR 240 - 120VACE

38、RMANUFACTURED THE BOSE 802EQRU:TNIS CONVERTIBLE TO FOR 240VACOONBY CHANGING THE 120VAC OPERPOWER TRANSFO RMER WIRING TO THE PRIMARY:FORMER LINK LK-2. a. REMOVE POWERTMERLINK LK-l AND b. ADDPOWESRpTERSREQUIRE NO LK-3 (THE VOL-rAGECONVE.?oNJPLUGFROM THE c CUT THE EXISTINTH 120 V TYPE. . UNIT ANDREPLCAERFROM REAR d. REMOVE 240VA OF UNIT. AL INP U