Bose-ACM-1-Service-Manual 电路图 维修手册.pdf

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1、1999 Bose Corporation Service Manual Part Number 199746 Rev. 00 ACM-1 Amplifier Control Module RadioFans.CN 收音机爱 好者资料库 2 CONTENTS PROPRIETARY INFORMATION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE

2、PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. CAUTION: The ACM-1 Amplifier Control Module contains no user serviceable parts. To prevent warranty infractions, refer servicing to warranty service centers or factor

3、y service. Safety Information. 3 Electrostatic Discharge Sensitive (ESDS) Device Handling . 4 Warranty Information . 4 Figure 1. ACM-1 Audio Section Block Diagram. 5 Figure 2. ACM-1 Monitoring Section Block Diagram. 6 Theory of Operation. 7-10 Disassembly/Assembly Procedures . 11-12 Figure 3. Input

4、Module Screw Removal.11 Figure 4. ACM-1 Default Switch Settings . 11 Figure 5. 1800VI Ribbon Cable Connector Location (ACM-1 J8 to 1800VI J2) . 11 Figure 6. ACM-1 J1 Ribbon Cable Connection . 12 Test Procedures .13-19 Table 1. ACM-1 Input, Output, and Power Connections. 13 Table 2. PS71 Power Supply

5、 List . 13 Figure 7. ACM-1 Switch Settings . 14 Figure 8. 1800VI Rear Panel Switch Settings. 14 Figure 9. ACM-1 Graphical User Interface Control Panel . 15 Table 3. Amplifier Output Performance Tests . 16 Test Cable Construction . 19 Part List Notes. 19 Main and Packaging Part list, ACM-1 Amplifier

6、Control Module (see Figure 10). 20 Figure 10. ACM-1 Amplifier Control Module Exploded View . 20 Electrical part list .21-25 Figure 11. Daughterboard Topside Etch Layout Diagram . 26 Figure 12. Daughterboard Internal Etch Layout Diagram . 26 Figure 13. Daughterboard Bottom Etch Layout Diagram . 26 In

7、tegrated Circuit Pinout Diagrams. 27-29 RadioFans.CN 收音机爱 好者资料库 3 SAFETY INFORMATION 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 ma

8、nufacturer. 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 (1) With the unit completely

9、 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 Laborator

10、ies (UL) 1492 (71). (2) With the unit AC switch first in the ON position and 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, e

11、tc.), especially any exposed metal parts that offer an electrical return path to the chassis. (3) Any current measured must not exceed 0.5 milliamp. (4) Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK

12、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 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 between t

13、he 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 specifie

14、d, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. RadioFans.CN 收音机爱 好者资料库 4 ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING This unit contains ESDS devices. We recommend the following precautions when repairing,

15、 replacing, or transporting ESDS devices: Perform work at an electrically grounded work station. Wear wrist 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 boa

16、rds by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap, or plastic trays. WARRANTY INFORMATION The ACM-1 Amplifier Control Module is covered by

17、a 5-year transferable limited warranty. 5 Clock Logic U21 8VCLK 3 13 14 22 DATA I08 ENABLE I07 Buffer Driver U8 Buffer Driver U7 Buffer Driver U7 Buffer Driver U8 Protection Circuitry Protection Circuitry Protection Circuitry Protection Circuitry Digital Attenuator 0 -100 dB U14 Switchable Inverter

18、U11 Selector U13 Selector U12 Selector U10 Eq Card 2 Eq Card 1 HF Switch SW2 Protection Circuitry Protection Circuitry Balanced Unbalanced Balanced Unbalanced Mode Switch U16 U15 A IN1+ IN1- GND A IN2+ IN2- GND 3 2 SW1B SW2B SW2A SW1A HF1 HF2 3 2 6 2 7 5 0 1 1 2 1 5 7 2 1 5 21 4 3 3 5 5 7 2 5 1 6 1

19、0 1 1 A A P2 CH. 2 EQ OUTPUT AMP IN 2 J1-20 AMP IN 1 J1-16 CH. 1 EQ OUTPUT P3 7 7 SW1B SW2B SW1ASW1BMODE 0 0 1 11 0 dont care dont care normal normal dual mono bridged Truth Table J6-5 J6-4 12 Figure 1. ACM-1 Audio Section Block Diagram 6 Rectification Rectification Mean Peak Mean Peak Current Sense

20、 RectificationMean Divider Current Sense RectificationMean Divider Rectifier Regulator Wired OR AD Gnd. +5Vdc Standby Network Power (dc / dc) Adapter Power (ac / dc) Amplifier Power (dc) Jumper I Out +1 I Out +2 V2_Peak V2_Mean V1_Peak V1_Mean I1_Mean I2_Mean I Out 1+ I Out 1- I Out 2+ I Out 2- Ther

21、mal Sensor Neuron Micro- processor Level Shifting Multiplexer Analog to Digital Converter 10-bit Serial Therm 1 Therm 2 106 dc Standby Protect 1 Protect 2 Aux 1 Aux 2 V1_Mean V1_Peak V2_Mean V2_Peak I1_Mean I2_Mean Amplifier Data Activity LED Service Pin Service LED Gnd. Network Power Power-up Netwo

22、rk (LonWorks) Signals to Amplifier Amp In 1 Amp In 2 Power-up LED Data Bus Signals from Amplifier Therm 1 Therm 2 Rail Voltage +I Out 1 -I Out 1 +I Out 2 -I Out 2 Protect 1 Protect 2 Figure 2. ACM-1 Monitoring Section Block Diagram 7 THEORY OF OPERATION General Description: The Bose ACM-1 Amplifier

23、Control Module is an optional replacement for the standard Input Module that is delivered with the Bose 1600 and 1800 Series VI Power Amplifiers. This module, which installs into the back of the amplifier in place of the standard input module, adds a network interface to the power amplifier; allowin

24、g the user to control and monitor the amplifier(s) remotely and simultaneously. This can be done only when the amplifier is in standby or sequence mode, which is set on the front of the amplifier. The network topology used by the ACM-1 Amplifier Control Module is the LonWorks network standard which

25、is a registered trademark of Echelon Corporation. The device controlling the amplifier(s) may be a personal computer or any other smart device that incorporates a LonWorks Neuron module. The Bose ACM-1 uses a LonWorks Neuron module to translate network polls into addressing, reading and writing comm

26、ands used to control the amplifier. This device contains a network transceiver and a micro-controller interacting with on-board flash- memory. On the main PCB of the ACM-1, an Analog to Digital Converter (ADC) translates amplifier operating conditions such as output level, temperature and clipping l

27、evel inside the amplifier to digital information to be passed to and from the Neuron module and ultimately, the network. This information can be monitored with a computer either locally, tied directly to the control network of the installation, or remotely, provided that the remote computer has a ne

28、twork connection such as a modem (Internet), Ethernet, or LAN, and the required software. The amplifier itself is controlled by setting a digital/analog signal attenuator to manipulate volume level, as well as to switch the amplifier from stand-by mode to operate mode and vice versa. The ACM-1 is no

29、rmally fed stand-by power by an external 12 Vrms AC power adapter when the amplifier is off or in stand-by (sequence) mode. This allows the amplifier to be turned on remotely by providing a constant power source to the Neuron module and the Analog to Digital Converter. The amplifier cannot supply po

30、wer to the Neuron module when the amplifier is switched off, which is why the AC adapter is required. Without this keep-alive voltage, the amplifier would not be able to be powered up remotely. Once the amplifier is operating, the keep-alive voltage could fail and still have the amplifier operate. O

31、nce the amplifier is shut off again, however, the keep-alive voltage must again be present to allow remote turn-on of the amplifier. The recommended AC power adapter is the Bose PS71. See Table 2 on page 12 for part numbers for the various models. The keep-alive voltage input circuitry of the ACM-1

32、is designed to also allow the use of a DC external stand-by power source. The nominal power requirements for a DC source are +12 Vdc at 100 mA. Furthermore, it is also possible to power the ACM-1 via the network cable. This must be a DC source. Although this mode of powering has its limitations due

33、to wire length and thickness, this option might be very useful in smaller or highly segmented applications. To use network power, jumpers at JB1 on the daughter- board must be set. Place jumpers across pins 1 if it is pulled low, the amplifier is in bridged mode. The configuration of the mode of the

34、 amplifier is done by setting the SW1 to the correct position Sheet 2, D7. 9 THEORY OF OPERATION The equalized signal is also routed to U7 C/D6 which forms output line drivers. The output of the EQ card is then available to link to the next amplifier, minimizing the need for additional EQ cards. Thi

35、s signal is available at the female EQ output jacks P2 and P3 C/D4 on the frontplate of the ACM-1 module. These outputs are also equipped with RFI low-pass T-filters, diode clamps and spark-gaps. The output impedance at audio frequencies is approximately 400 Ohms, making it possible to drive long ca

36、ble lengths without oscillation. After the audio signals are equalized and composed in such a way as to set the correct mode of the amplifier, they are routed into a software controlled attenuator U14 D5. With this attenuator, the level of the audio signal can be attenuated in steps of 1 dB from 0 d

37、B all the way down to -100 dB. The lowest attenuation level is a full mute. The attenuation level is set by the serial data stream IO9 (DATA) from the Neuron. The attenuator is addressed with I07 (ENABLE) with the timing signal supplied by IO8 (CLOCK), which is generated by the Neuron. The 3.16 k Oh

38、ms resistors R40, 41, and 42, protect U14 from damage when the ACM-1 is in standby mode. In this mode, the attenuator is off, but the Neuron is still powered. The quad-NAND U21 Sheet 2, C4/5 generates VCLK from the ENABLE and CLOCK signal. This logic is used by the TC9412F attenuator. After the leve

39、l is set with the attenuator, signal buffer U8 C/D4 routes the signal out through J1 pins 16 and 20 Sheet 2, B7 to the power stages of the amplifier. Monitoring and control, digital section: Refer to the ACM-1 Schematic Diagram, Sheet 1 of 2, for the following information. The monitoring and control

40、 of the amplifier is performed by the plug-in LonWorks Neuron module (not shown on schematic) which plugs into the ACM-1 motherboard at J9 and J10 Sheet 2, A/B7. This module incorporates a network transceiver which is connected to the systems control network by means of RJ-45 connectors J12 and J13

41、Sheet 2, D4, which are located on the daughterboard. The Neuron module switches the amplifier to operate mode by pulling low the IO6 signal on transistor Q1 Sheet 2, A4. This transistor causes current to flow into the opto coupler, located inside the amplifier which fires the TRIAC in the amplifiers

42、 power supply. Refer to the 1600VI/1800VI service manual, Bose part number 199747, for more information on the amplifiers. Each Neuron module is assigned its own unique identification number when it is manufactured. It can only be activated and controlled by this unique address. If the address number fo