Bose-901-VI-Service-Manual 电路图 维修手册.pdf

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1、901 Series VI Direct/Reflecting Loudspeaker System 1996 Bose Corporation Service Manual Part Number 133546 RadioFans.CN 收音机爱 好者资料库 1 PROPRIETARY INFORMATION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BO

2、SE PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. Contents Safety Information. 2 901 Speaker Specifications . 3 901 Equalizer Specifications. 3 Speaker Disassembly/Assembly Procedures . 4 Figure 1. Grille Removal

3、Tool . 4 Figure 2. Staple Location . 4 Speaker Test Procedures . 5 Figure 3. Schematic and Driver Location . 5 Figure 4. Driver Insulation . 5 901 Speaker Part List. 6 Figure 5. 901 Speaker Exploded and Packaging View . 6 901 EQ Disassembly/Assembly Procedures . 7 901 Equalizer Test Procedures . 8 P

4、art List Notes. 9 Voltage Conversion. 9 Figure 6. 220V Transformer 120993 . 9 Figure 7. 120V Transformer 120993 . 9 Figure 8. 120V Transformer 120992 . 9 901 Equalizer Assembly Part List. 10 Figure 9. 901 Equalizer Assembly View. 10 901 Equalizer Electrical Part List. 11-13 901 Packaging Part List.

5、14 Figure 10. Packaging View . 14 Figure 11. PCB Layout . 15 RadioFans.CN 收音机爱 好者资料库 2 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

6、manufacturer. 2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit to the customer. Use the following checks to perform these measurements: A. Leakage Current Hot Check-With the unit completely r

7、eassembled, 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 Laborat

8、ories (UL) 1492 (71). With the unit AC switch first in the ON position, then in the OFF position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.),

9、 especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ- ARD THAT

10、 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 be- tween the jumper

11、ed 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, ther

12、e is the possibility of a shock hazard, and the unit must be repaired and re- checked before it is returned to the customer. SAFETY INFORMATION RadioFans.CN 收音机爱 好者资料库 3 901 SPEAKER SPECIFICATIONS Transducer Complement:Nine 4.5 Helical Voice Coil drivers per enclosure Enclosure:14-element Acoustic M

13、atrix with three Reactive Air Columns Energy Distribution:89% by reflection, 11% by direct radiation Nominal Impedance:8 Amplifier Power Requirements:Minimum: 10 watts per channel Maximum: Unlimited in non-commercial applications Recommended Fusing:3A quick acting fuse (3AGC or equivalent) Cabinet:W

14、axed rubbed walnut, oak or teak veneers and black gloss finish Dimensions:21W x 12 5/8H x 13D (533 x 320 x 330mm) Shipping Weight:37lbs (16.78kg) per enclosure 901 EQUALIZER SPECIFICATIONS Input Impedance:47k Output Impedance:1k Usable Dynamic Range:106dB at 35Hz Noise: 90dB below 1Vrms (A-Weighted)

15、 Distortion: 0.09% THD at 1kHz, 1Vrms input Compensation Controls:Mid-Bass, 6dB at 225Hz Mid-Treble, 3dB at 3kHz Bass Switch, -6dB at 35Hz Power Requirements:USA, 120Vac, 60Hz, 2.5W Euro, 220Vac, 50/60Hz Japan, 100Vac, 50/60Hz Cabinet:Black anodized aluminum Dimensions:2 3/4H x 13W x 4 15/16D (70 x

16、330 x 125mm) Shipping Weight:4.75 lb. (2.15 kg) Unit Weight:3.4 lb. (1.5 kg) 4 SPEAKER DISASSEMBLY/ASSEMBLY PROCEDURES 5. Driver Removal 5.1 Perform procedure 1 to remove any of the eight drivers located in the rear and procedure 3 to remove the driver located in the front. 5.2 Remove the three scre

17、ws (14) that secure the driver (1) to the cabinet. 5.3 Lift the driver out of the cabinet and cut the wires as close as possible to the driver terminal. 6. Driver Replacement 6.1 Attach the wires to the replacement driver (1). See Figure 3 for wiring configura- tion. 6.2 Replace the three screws (14

18、) that secure the driver to the cabinet. Flat Blade Screwdriver Machined to a Hook Figure 1. Grille Removal Tool Figure 2. Staple Location Note: Numbers in parenthesis correspond to item call outs in Figure 5. 1. Rear Grille Removal 1.1 To release the grille (4) from the slots on the edges of the ca

19、binet, grasp the left or right edge of the grille and pull it toward the center of the speaker. 1.2 To release the grille from the double stick tape, continue to pull the grille off by the edges. 2. Grille Replacement 2.1 Line up the grille (4) with the slot on the edge of the cabinet. 2.2 Press the

20、 grille into place, allowing the grille to be secured by the double stick tape and the slots on the left and right side of the cabinet. 3. Front Grille Removal Note: The front grille (3) is secured with staples to the cabinet. Figure 1 shows how to make a tool to remove the staples. 3.1 Remove five

21、staples on one side of the cabinet and the three staples located on the front of the opposite side, to gain access to the front driver. Plastic backed grilles only used two staples on each side. For plastic backed grilles it is only neces- sary to remove two staples, to gain access to the front driv

22、er. See Figure 2 for the staple locations. 3.2 Pull the grille up to release it from the retaining slots on the edges of the cabinet. This will expose the front driver. 4. Front Grille Replacement 4.1 Place the grille (3) back into the retain- ing slots on the edges of the cabinet. 4.2 Use dark stap

23、les or small nails to attach the grille to the cabinet. See Figure 2 for the staple locations. 5 SPEAKER TEST PROCEDURES 1. Phase Test 1.1 Apply 13Vdc to the speaker input terminal. Observe Polarity. 1.2 The drivers should move outward. If one or more moves inward, check the wiring of the driver. 2.

24、 Air Leak Test 2.1 Apply a 26Vrms, 40Hz signal to the speaker input terminal. 2.2 Listen for air leaks located around the cabinet and drivers. Repair any that are found. 3. Rub and Tick Test 3.1 Apply a 26Vrms, 10Hz signal to the speaker input terminal. 3.2 No extraneous noise such as rubbing, scrap

25、ing or ticking should be heard. Note: To distinguish between normal suspension noise and rubs or ticks, dis- place the cone of the driver slightly with your fingers. If the noise can be made to go away or get worse, its a rub or tick and the driver should be replaced. If the noise stays the same, it

26、s normal suspension noise and it will not be heard with program material. 4. Sweep Test 4.1 Apply a 13Vrms, 10Hz signal to the speaker input terminal. Sweep the speaker from 10Hz to 75Hz. 4.2 Reduce the applied signal to 3Vrms. Sweep the speaker from 75Hz to 5kHz. 4.3 Listen for any buzzes or rattle

27、s. Tighten any screw or replace any driver that causes a rattle or buzz. Redress any wires that buzz. 5. Intermittent Output Test Note: If a customer complains of an inter- mittent output from the speaker, the prob- lem could be an intermittent connection at the tinsel crimp. Perform the following p

28、rocedures only if the customer complains of an intermittent output. 5.1 Apply a 25Vrms, 40Hz signal to the speaker input terminal until the speakers output drops or cuts out which is usually about five minutes. 5.2 Check the temperature of each drivers black insulating material. If a drivers black i

29、nsulating material is found to be hot, replace that driver. Note: In some occasions, the resistance at the intermittent connection causes enough heat to visually affect the black insulating material. Visually check each drivers black insulation for heat damage. Figure 4. Driver Insulation Figure 3.

30、Schematic and Driver Location 34 21 5 67 98 +-+ + - - - - + + +- - - Blue RedBlackBlue Yellow Yellow Blue Black Red Blue (Front) 34 21 67 98 5 Figure 5. 901 Speaker Exploded and Packaging View 901 SPEAKER PART LIST Item Number DescriptionPart Number Qty 1Driver, 4.5124276-59 2Gasket, Driver, 4.51284

31、079 3Grille, Front, Dark Brown Grille, Front, Black Grille, Front, Sand 136888-5 136888-3 136888-1 1 4Grille, Rear, Dark Brown Gille, Rear, Black Grille, Rear, Sand 131436-5 131436-3 131436-1 1 5Logo, Brown/Gold Logo, Black/Ivory 138507 138508 1 6Nut, Spring1257561 7Gasket, Rear Grille1323232 8Nut,

32、Knurled, 8-32100424-12 9Washer, Flat, .1741216464 10Trim Ring, Terminal, 41182541 11Carton, RSC1817681 12Packing, End Cap1314472 13Sheet, Dec Of Conformity1840561 14Screw, Tapp, 8-11 x .625, Pan172672-1027 -Bag, Poly, 23 x 44 x 10.5 x 1.251006521 -Foam Tape11822312 6 7 901 EQ DISASSEMBLY/ASSEMBLY PR

33、OCEDURES Note: Numbers in parenthesis correspond to item call outs in Figure 9. 1. Top Cover Removal 1.1 Remove the four screws (17) that secure the top cover (12) to the chassis (11) 1.2 Lift the top cover off. 2. Top Cover Replacement 2.1 Place the top cover (12) onto the chassis (11) and secure i

34、t with four screws (17). 3. PCB Removal 3.1 Perform procedure 1 first. 3.2 Remove the six screws (20) (21) that secure the PCB to the chassis (11). 3.3 Lift the PCB up. The front and rear panel will lift up with the PCB. 4. PCB Replacement 4.1 Line up the screw holes in the PCB with the standoffs on

35、 the chassis (11). 4.2 Replace the six screws (20) (21) that secure the PCB to the chassis. 5. Front Panel Removal 5.1 Perform procedure 1 and 3 first. 5.2 Pull the slide pot knobs (7) off. The front panel (13) will slide off. 6. Front Panel Replacement 6.1 Slide the front panel (13) on so that the

36、slide pots protrude through the front. Replace the slide pot knobs (7) by pushing them on. 7. Rear Panel Removal 7.1 Perform procedure 1 and 3 first. 7.2 Remove the four screws (19) that secure the rear panel (14) to the RCA jacks. 7.3 Use a strain relief tool to remove the strain relief (10) that s

37、ecures the line cord (15) to the rear panel. 8. Rear Panel Replacement 8.1 Replace the four screws (19) that secure the rear panel (14) to the RCA jacks. 8.2 Use a strain relief tool to replace the strain relief (10) that secures the line cord (15) to the rear panel. 8 901 EQUALIZER TEST PROCEDURES

38、1. DC Measurement Test 1.1 Measure the DC voltages at the points listed in the following table. Refer to the schematic diagram for the test locations. Test Point Min. DC Nominal DC Max. DC TP122.524.025.5 TP214.2515.015.75 TP3-25.5-24.0-22.5 TP4-15.75-15.0-14.25 2. Gain Test 2.1 Apply a 500mVrms, 10

39、0Hz signal to the left or right input. Adjust both slide pots to their center position and the bass switch to position 1. Reference a dB meter to the applied signal. 2.2 Measure the output according to the following table. InputOutputMonitor Position GainNo Output Left/RightLeft /Right Source-0.9 +1

40、.0dB Left (Right) Tape Inputs Left/Right Left/Right Tape Source0 +0.5dB - Left/Right Tape Left /Right Tape-0.9 +1.2dB Left (Right) Tape Inputs 3. Frequency Response Test 3.1 Apply a 500mVrms, 100Hz signal to the left and right input. Reference a dB meter to the left or right output. 3.2 Measure the

41、left and right output according to the following table. Freq.Bass 1 (dB) Bass 2 (dB) Both Pots Max. Cut (dB) Both Pots Max. Boost (dB) 35Hz9.8 1.52.8 2.0 100HzReference 225Hz-5.8 1.0-12.5 2.0+0.5 2.0 650Hz-7.7 1.0-10.5 2.0-5.1 2.0 1.85kHz+.2 1.5 3kHz+.5 1.5-3.4 2.0+4.3 2.0 13kHz+12.2 1.5+2.8 2.0+20.8 2.0 4. Distortion Test Note: Adjust both slide pots to the maxi- mum cut position. 4.1 Apply a 2.0Vrm