Bose-Acoustimass-Pro-Service-Manual 电路图 维修手册.pdf

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1、1997 Bose Corporation Acoustimass Professional Powered Speaker System Service Manual Part Number 141566 REV 01 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 IDENTIFIE

2、D 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. Contents Safety Information. 2 Electrostatic Discharge Sensitive (ESDS) Device Handling . 3 Specifications.3-4 Disassembly/Assembly Procedures . 5-6 Figure 1.

3、Bottom Panel . 6 Figure 2. Side View of Chassis . 6 Figure 3. Amplifier Chassis Cover. 6 General Test Setup. 7 Test Procedures . 7-8 Part List Notes. 9 Main Assembly Part List. 10 Figure 4. Exploded View . 10 Electrical Part List. 11-16 Packaging . 17 Figure 6. Packaging View . 17 Figure 7. Wiring S

4、chematic . 17 Figure 8. Driver Location. 17 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 in the part lists. Use only replacement parts that have critical characteristics recommended by the manufacturer. 2.

5、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 reassembled, plug

6、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

7、). With the unit AC switch first in the ON position and then in 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, screw-heads, metallic overlays, control shafts, etc.), especially any exp

8、osed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the units 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

9、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 jumpered AC plug and each

10、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 Meg ohms. 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

11、of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. SAFETY INFORMATION CAUTION: THE BOSE ACOUSTIMASS PROFESSIONAL POWERED SPEAKER SYS- TEM CONTAINS NO USER SERVICEABLE PARTS. TO PREVENT WARRANTY INFRAC- TIONS, REFER SERVICING TO WARRANTY SERVICE STAT

12、IONS OR FACTORY SER- VICE. RadioFans.CN 收音机爱 好者资料库 3 Electrostatic Discharge Sensitive (ESDS) Device Handling This unit contains ESDS devices. We recommend the following precautions when repairing, replacing or transporting ESDS devices: Perform work at an electrically grounded work station. Wear wr

13、ist 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 in

14、sert unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap or plastic trays. SPECIFICATIONS General Electrical Inputs:Line-level balanced XLR and unbalanced 1/4 phono Input Impedance:10k unbalanced, 2.4k balanced Pin Assignment:See schematic Maximum Am

15、perage:6.5 amps Power Input Requirements:120V, North America 230V, Europe and Australia 100V, Japan Power Output:100VAC line input: 350W 115VAC line input: 450W 230VAC line input: 450W Common Mode Rejection Ratio:40 dB Weight:75 lb. (34 kg) Dimensions:16H x 22 1/4 W x 23 1/4 D (40.6 x 56.5 x 59.1 cm

16、) Driver Complement:Six 4 1/2 helical voice coil drivers, One 12 magnetically braked woofer 4 SPECIFICATIONS Acoustics Frequency Response:50-18k 3dB Maximum Output (free field) Speech Only: Music: 122 dB SPL, 1m 120 dB SPL, 1m Crossover Frequency:200Hz Dispersion Angles (-6 dB down points) Horizonta

17、l: Vertical: Horizontal, Stacked Pair: Vertical, Stacked Pair: 100 at -6 dB averaged by octave, 1kHz-8kHz 60 at -6 dB averaged by octave, 1kHz-8kHz 100 at -6 dB averaged by octave, 1kHz-8kHz 30 at -6 dB averaged by octave, 1kHz-8kHz Environmental Temperature Operating Range: Storage Range: Humidity:

18、 -20F to 122F (-29C to 50C) -40F to 180F (-40C to 82C) 20-95% relative humidity (Note: Do not operate this speaker system in the rain or when wet.) Mechanical Structure Cabinet Material:Structural polyurethane foam Tie Rods (4):1/4 -20 UNC Baffle Material:Die-cast aluminum Grille Material:Stainless

19、steel Threaded inserts:8 mm - 18 UNC T-Nuts:1/4 -20 UNC 5 Note: Numbers in parentheses correspond to the item call outs in Figure 1, 2, 3, 4. 1. Amplifier Removal 1.1 Remove the sixteen screws (8) that secure the amplifier (3) to the cabinet. 1.2 Lift the amplifier out of the enclosure. Disconnect t

20、he ground lug from the ampli- fier chassis and the two output wires from the capacitor (14) and inductor (13). 2. Amplifier Replacement 2.1 Connect the ground wire (green) to the amplifier (3) chassis. Connect the red wire to the capacitor (14) and the black wire to the inductor (13). 2.2 Replace th

21、e sixteen screws (8) that secure the amplifier to the cabinet. 3. Woofer Removal 3.1 Perform procedure 1 first. 3.2 Remove the eight screws (8) that secure the woofer (1) to the cabinet. 3.3 Lift the woofer out and remove the two wires connected to it. 4. Woofer Replacement 4.1 Connect the red wire

22、to the positive and the black wire to the negative terminal of the woofer (1). 4.2 Replace the eight screws (8) that secure the woofer to the cabinet. 5. Grille Removal 5.1 Remove the eight screws (7) that secure the grille (4) to the cabinet. 5.2 Pull the grille off. Note: On some units the screws

23、are secured with loctite. Use MEK solvent to remove the screws. 6. Grille Replacement 6.1 Align the grille (4) with the cabinet so that the Bose logo is in the same direction as the label on the amplifier. 6.2 Replace the eight screws (7) that secure the grille to the cabinet. 7. Driver Removal 7.1

24、Perform procedure 5 first. 7.2 Remove the three screws (6) that secure the driver (2) to the cabinet. 7.3 Lift the driver out from the cabinet and remove the two wires attached to it. Note: On some units the screws are secured with loctite. Use MEK solvent to remove the screws. 8. Driver Replacement

25、 8.1 Connect the two wires to the driver (2). Refer to the wiring diagram on page 18. 8.2 Replace the three screws (6) that secure the driver to the cabinet. 9. Amplifier Cover Removal 9.1 Perform procedure 1 first. 9.2 Remove the six screws (A) that secure the top cover to the chassis and lift the

26、top cover off. 10. Amplifier Cover Replacement 10.1 Align the top cover to the chassis and replace the six screws (A) that secure the top cover to the chassis. 11. Amplifier Chassis Cover Removal 11.1 Perform procedure 1 and 9 first. 11.2 Remove the ten screws (E) that are located on each side of th

27、e chassis and the ten screws (F) that are located on the top of the chassis. (Figures 1, 2, 3, 4) DISASSEMBLY/ASSEMBLY PROCEDURES 6 DISASSEMBLY/ASSEMBLY PROCEDURES (Figures 1, 2, 3, 4) A A A A A A C B B B BB B B B D Figure 1. Bottom Panel E EE Figure 2. Side View of Chassis F F F F F F F F F Figure

28、3. Amplifier Chassis Cover 11.3 Lift the chassis cover up and remove the connector from the PCB. 12. Amplifier Chassis Cover Replacement 12.1 Align the chassis cover to the chassis and replace the ten screws (E) that are located on each side of the chassis and the ten screws (F) that are located on

29、the top of the chassis. 13. Bottom Panel Removal 13.1 Perform procedure 1 and 9 first. 13.2 Remove the eight screws (B) and the four nuts (C) that secure the bottom cover to the chassis. 13.3 Using a strain relief tool, remove the two strain reliefs (D) that secure the two output wires. Lift the bot

30、tom cover off. 14. Bottom Panel Replacement 14.1 Feed the wires through the holes in the bottom panel. Replace the eight screws (B) and the four nuts (C) that secure the bottom cover to the chassis. 14.2 Using a strain relief tool, replace the two strain reliefs (D) that secure the two output wires.

31、 7 General Test Setup Caution! There is no mains isolation transformer in this amplifier! This amplifier must be isolated from the AC line by a 1.0 kVa or larger isolation transformer during all testing! A stancore GIS-1000 or equivalent isolation transformer should be used for 100VAC and 120VAC uni

32、ts. A Siemens 4AX24-16-2BK or equivalent isolation transformer should be used for 230VAC units. A variac rated 1.0kVA or larger should be used to vary the line voltage. Output Loading: Unless otherwise speci- fied, perform all tests with a series con- nected 16, 1%, 500 watt resistor and a 1.0mH, 10

33、%, 5 amp rated inductor as the load. Input: Unless otherwise specified, apply a 1kHz, 1.0Vrms signal to the amplifiers unbalanced input. All output measurements should be made with a 30kHz, 4 pole low pass filter in series with the input of the measurement equip- ment to reject the switching ripple.

34、 1. Switching Frequency 1.1 With out an applied signal, measure the switching frequency at the amplifiers out- put. It should be 110kHz to 130kHz. Do not use the 30kHz low pass filter when perform- ing this test. 2. Output Ripple 2.1 The level of the switching frequency should be less than 20Vpp. Do

35、 not use the 30kHz low pass filter when performing this test. TEST PROCEDURES VariationOutput Voltage Limit 100V104.5Vp to 115.5Vp 120V125.4Vp to 138.6Vp 240V125.4Vp to 138.6Vp 3. Voltage Limiting 3.1 Apply a 1.0Vrms, 100Hz signal to the amplifiers input. Measure the output according to the followin

36、g table. 4. Current Limiting 4.1 Apply a 1.0Vrms, 100Hz signal to the amplifiers input and connect an 8 resis- tive load to the output. 4.2 The output voltage should be 80.0Vp 8.0Vp (corresponding to 10A 1A). 5. Reference Gain 5.1 Apply a 50mV, 1kHz signal to the amplifiers input. Reference a dB met

37、er to the applied signal. 5.2 Measure the output of the amplifier. It should be 32.0dB 1.5dB. 6. Frequency Response 6.1 Apply a 50mV, 1kHz signal to the amplifiers input. Reference a dB meter to the amplifiers output. Measure the output according to the following table. Note: Use the last six digits

38、 of the serial number to determine which table to use. The serial number is located on the side of the amplifier as MK01xxx_ or MZ01xxx_. 8 Use for serial numbers 050121 and above (later EQ) Use for serial numbers 050120 below (earlier EQ) 7. Amplifier Distortion 7.1 Apply a 50Hz, 1kHz and 10kHz sig

39、nal to the input of the amplifier at a level to obtain an output according to the following table. The distortion measured at the output should be less than 0.4% at 50Hz and 1kHz and less than 1.0% at 10kHz. TEST PROCEDURES 8. Hum 8.1 Short all inputs to input ground. The hum measured at the output

40、should be less than 4mVrms, C weighted. 9. Noise 9.1 Short all inputs to input ground. The noise measured at the output should be less than 3mVrms, A weighted. 10. Common Mode Rejection Ratio (CMRR) 10.1 Connect the positive side of a signal generator to the positive and negative side of the XLR amp

41、lifier input. Apply a 3.0Vrms 60Hz and then a 1kHz signal. Reference a dB meter to the applied signal. 10.2 The output should be less than -40dB. FrequencyOutputTolerence 30Hz0.2dB2.5dB 50Hz17.1dB1.5dB 90Hz12.6dB1.5dB 150Hz11.2dB1.5dB 350Hz4.9dB1.5dB 1kHzReference- 4kHz14.7dB2.7dB 7kHz13.0dB2.7dB 13

42、kHz22.0dB5.0dB 20kHz14.8dB3.0dB FrequencyOutputTolerence 30Hz-4.6dB4.0dB 50Hz13.5dB1.8dB 90Hz10.0dB1.8dB 150Hz11.2dB1.8dB 350Hz4.7dB2.0dB 1kHzReference- 4kHz14.8db3.0dB 7kHz14.7dB3.0dB 13kHz25.4dB5.5dB 20kHz16.5dB4.0dB VariationOutput Power Reference Voltage Load 100V300W70Vrms16 120V450W85Vrms16 24

43、0V450W85Vrms16 9 1. This part is not normally available from customer service. Approval from the Field Service Manager is required before ordering. 2. The individual parts located on the PCB are listed in the part list. 3. This part is critical for safety purposes. Failure to use a substitute replacement with the same safety characteristics as t