Bose 901 VI Part1 电路图.pdf

1 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 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 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 Part 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. 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 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 reassembled, 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 Laboratories (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.), 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 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 jumpered 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, there 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 Matrix 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:Waxed 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) 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 330 x 125mm) Shipping Weight:4.75 lb. (2.15 kg) Unit Weight:3.4 lb. (1.5 kg) RadioFans.CN 收音机爱 好者资料库 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 screws (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) 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 cabinet, 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 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 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 driver. 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 staples 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. 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, scraping 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, its 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 rattles. 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 procedures 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 insulating 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. Schematic and Driver Location 34 21 5 67 98 +-+ + - - - - + + +- - - Blue RedBlackBlue Yellow Yellow Blue Black Red Blue (Front) 34 21 67 98 5