Bose-A1-Service-Manual 电路图 维修手册.pdf

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1、1 CONTENTS Safety Information.2 Warranty.2 Product Description.3 Carton Contents .3 Amplifier Rear Panel Connections and Controls.4 Top Panel Indicators .4 Setting Up a Single A1 Amplifier .5 Using Multiple A1 Amplifiers.6 Using the A1 in other applications .7 Setting up the A1 for use with other sy

2、stems:.7 Specifications.8 Production Notes .9 Electrostatic Discharge Sensitive (ESDS) Device Handling .9 Part List Notes.9 Packaging Part List, PackLiteTM A1 Amplifier Assembly (see Figure 1).10 Figure 1. PackLite A1 Amplifier Assembly Packaging View.10 Main Part List, PackLite A1 Amplifier Assembl

3、y (see Figure 2).11 Figure 2. PackLite A1 Amplifier Exploded View .12 Electrical Part Lists. 13-29 Power Supply / Amplifier PCB Assembly. 13-22 Input / Limiter PCB Assembly . 23-28 Signal LED PCB Assembly.29 Power / Fault LED PCB Assembly .29 Disassembly Procedures . 30-33 Test Procedures . 33-34 Fi

4、gure 3. Amplifier/SMPS PCB (Non- RoHS) Topside Etch Layout .35 Figure 4. Amplifier/SMPS PCB (Non- RoHS) Internal Etch Layer 1 Layout .35 Figure 5. Amplifier/SMPS PCB (Non- RoHS) Internal Etch Layer 2 Layout .36 Figure 6. Amplifier/SMPS PCB (Non- RoHS) Bottom Etch Layout.36 Figure 7. Amplifier/SMPS P

5、CB (RoHS) Topside Etch Layout.37 Figure 8. Amplifier/SMPS PCB (RoHS) Internal Etch Layer 1 Layout .37 Figure 9. Amplifier/SMPS PCB (RoHS) Internal Etch Layer 2 Layout .38 Figure 10. Amplifier/SMPS PCB (RoHS) Bottom Etch Layout.38 Figure 11. Input/Limiter PCB (Non- RoHS) Top Side Etch Layout.39 Figur

6、e 12. Input/Limiter PCB (Non- RoHS) Bottom Side Etch Layout.39 Figure 13. Input/Limiter PCB (RoHS) Top Side Etch Layout .40 Figure 14. Input/Limiter PCB (RoHS) Bottom Side Etch Layout.40 Figure 15. Power/Fault LED PCB Etch Layout .41 Figure 16. Signal/Overload LED PCB Etch Layout .41 Test Cable Wiri

7、ng Diagrams.41 Troubleshooting .42 Theory of Operation, PackLite Model A1 Amplifier. 43-50 Integrated Circuit Diagrams. 51-53 Service Manual Revision History.54 RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION 1. Parts that have special safety characteristics are identified by the symbol on schematics o

8、r 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 cu

9、stomer. 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 com

10、plies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) UL6500 / UL60065 / IEC 60065 paragraph 9.1.1. With the unit AC switch first in the ON position and then in OFF position, measure from a known earth ground (metal waterpipe

11、, 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 t

12、he unit 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 BEFORE RETURNING THE UNIT TO THE CUSTOMER. B. Insulation Resistance Test Cold Check- (1) Unplug the power supply and connect a jump

13、er wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on the unit. When testing 3 wire products, the resistance measured to the product enclosure should be

14、between 2 and infinite MOhms. Also, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. When testing 2 wire prod- ucts, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. If it is not within the limits spe

15、cified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. CAUTION: The Bose PackLiteTM Model A1 Amplifier contains no user-serviceable parts. To prevent warranty infractions, refer servicing to warranty service stations or

16、factory service. 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 FO

17、R ANY OTHER PURPOSE. The Bose PackLite Model A1 Amplifier is covered by a limited 1- year transferable warranty. WARRANTY RadioFans.CN 收音机爱 好者资料库 3 The PackLiteTM Model A1 power amplifier is a small, lightweight, powerful, and easy- to- use amplifier that interfaces quickly with the Bose PS1 power s

18、tand and B1 bass modules to provide high bass output for demanding instruments such as bass guitar and drums. The con- nections are quick and easy: plug in the AC cord, connect the A1 to the PS1 power stand, and play. When the A1 is used together with the Cylindrical Radiator loudspeaker, no time- c

19、onsum- ing adjustments are required. The components act as a system and automatically adjust bass output for more level and headroom, while maintaining consistent tone regardless of how many B1 bass modules are being used. In addition, the A1 can drive other passive loudspeakers such as bass guitar

20、cabinets, subwoofers, studio monitors, and floor monitors. Product Description Carrying pouch PackLite power amplifier Model A1 AC power cord TRS (balanced) cable (20 inches, 0.5 m) Owners guide Carton Contents RadioFans.CN 收音机爱 好者资料库 4 Amplifier Rear Panel Connections and Controls 12345 1 - AC powe

21、r connector: Accommodates the supplied AC power cord to connect your amplifier to the appropriate AC (mains) outlet. Check the product label of your amplifier for the voltage rating: 120V or 220- 240V. 2 - Power switch: In the ON (l) position, applies power to your amplifier. When ON, the power indi

22、cator (see diagram below) should be BLUE. 3 - OUTPUT connector: Accommodates both 2 and 4- wire Neutrik Speakon connectors. OUTPUT can be connected to any of the following: B1 bass module. 4- ohm loudspeaker with a power rating of at least 250W RMS. 8- ohm loudspeaker with a power rating of at least

23、 125W RMS. 4 - INPUT connector: Accommodates a TRS (balanced) or TS (unbalanced) plug. INPUT can be connected to either of the following: Bass- Line OUT jack on the PS1 power stand using the supplied TRS cable. THRU connector of an “upstream” A1 amplifier when used in series. Other line- level sourc

24、e output using either a TRS or TS cable. 5 - THRU connector: Accommodates a TRS or TS connection. Used for sending the INPUT signal to another A1 amplifier. Notes: 1. Do not use the THRU connector as a second input, as it could damage any interconnected equipment. Use THRU only as an output to anoth

25、er A1 amplifier. 2. The THRU connector will only relay the type of input (balanced or unbalanced) present at the INPUT connector. Top Panel Indicators 5 The A1 amplifier is designed to add more bass output to a system that already has two B1 bass modules connected to the Amp 3 OUT connector on the P

26、S1 power stand. The A1 amplifier can power up to two additional B1 bass modules. Follow these steps to set up the A1 as shown below. 1. Connect the AC power cord to an AC (mains) outlet. 2. Make sure the A1 amplifier Power switch is OFF. 3. Using the supplied TRS cable, connect the Bass- Line OUT co

27、nnector on the PS1 power stand to the INPUT connector on the A1 amplifier. 4. Connect a B1 bass module cable from the OUTPUT connector on the A1 to a B1 bass mod- ule. If desired, connect a second B1 to the first B1. 5. Set the A1 power switch to ON (I). CAUTION: Do not connect more than two B1 bass

28、 modules to an A1 amplifier. CAUTION: Be careful not to connect the A1 amplifier to a B1 bass module that is already connected to the Amp 3 OUT connector of a PS1 power stand, or to another A1 amplifier. Note: Using the supplied TRS cable with your A1 amplifier is recommended. Using balanced cabling

29、 prevents common interconnect noise problems. Note: Up to four (maximum) B1 bass modules can be stacked in a column. Stacking may improve acoustic output. B1 bass modules B1 bass modules PS1 power stand Bass-Line OUT INPUT OUTPUT A1 amplifier Setting Up a Single A1 Amplifier 6 Using Multiple A1 Ampl

30、ifiers To add more bass capability to your system, you can connect multiple A1 amplifiers as shown below. 1. Connect the AC power cord to an AC (mains) outlet. 2. Make sure the Power switch is OFF. 3. Using the supplied TRS cable, connect the Bass- Line OUT connector on the PS1 power stand to the IN

31、PUT connector on the first A1 amplifier. 4. Using another TRS cable, connect the THRU connector on the first A1 amplifier to the INPUT connector of the next A1 amplifier. 5. Connect a B1 bass module to the OUTPUT connector on each A1 amplifier. If desired, connect a second B1 to the first B1. 6. Set

32、 power switch on both A1 amplifiers to ON (I). CAUTION: Be careful not to connect the A1 amplifier to a B1 bass module that is already connected to the Amp 3 OUT connector of a PS1 power stand or to another A1 amplifier. Note: Up to four (maximum) B1 bass modules can be stacked in a column. Stacking

33、 may improve acoustic output. B1 bass modules B1 bass modules 1st A1 2nd A1 B1 bass modules PS1 power stand 7 Using the A1 in other applications The A1 amplifier can be used as a power amplifier in other system configurations. The A1 can drive other passive loudspeakers including subwoofers, floor m

34、onitors, studio monitors, and guitar cabinets. The A1 can amplify a balanced or unbalanced signal from a line- level device, such as a mixing console, and drive any loudspeaker load (4- ohm minimum) that is capable of handling 250W. Setting up the A1 for use with other systems: 1. Make sure the A1 a

35、mplifier Power switch is OFF. 2. Connect a line- level output connector from your source device to the INPUT connector of the A1 amplifier. This could be the line- level output from an electronic crossover, mixing console, electric bass/electric guitar amplifier head unit, preamp, digital modeler, o

36、r studio console line output. You can use either a balanced (TRS) or unbalanced (TS) connection. The amplifier will sense the type of connection and automatically adjust the overall level. 3. Connect the OUTPUT of the A1 amplifier to: Any 4- ohm loudspeaker load capable of handling at least 250 watt

37、s RMS. Any 8- ohm loudspeaker load capable of handling at least 125 watts RMS. 4. If you want to add an additional A1 for more bass, connect the THRU connector of the first A1 to the INPUT connector of another A1 amplifier using a TRS cable. 5. Set the A1 power switch to ON (I). 6. Adjust the source level so that the A1 signal indicator flashes green. At a maximum source level, the A1 signal indicator occasionally flashes red. If the indicator is constantly red, reduce the source level