Related Manuals for Bose Powered Acoustimass 30
Summary of Contents for Bose Powered Acoustimass 30
- Page 1 ® ® ® Powered Acoustimass Speaker System AM-30P © 2008 Bose Corporation Service Manual Part Number 194382 REV 1...
- Page 2 Contents Safety Information ..........................3 Electrostatic Discharge Sensitive (ESDS) Device Handling ............4 Specifications ........................... 5 Theory of Operation ........................6-18 Figure 1. Center Channel Frequency Response ................10 Figure 2. Surround Channel Frequency Response ................ 11 Figure 3. Bass and Left/Right Channel Frequency Response ............11 Figure 4.
- Page 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 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.
- Page 4 ® 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.
- Page 5 SPECIFICATIONS Dimensions: Module: 23.3"W x 7.5"D x 14.0"H (59 x 19 x 35.5cm) Satellite: 2.2"W x 3.2"D x 4.4"H (5.6 x 8.1 x 11.2cm) Weight: Module: 33 lb. (15kg.) Satellite: 1 lb. (0.5kg.) Packed System: 27 lb. (12.3kg.) Module: 5-1/4" Woofers, 8Ω (parallel) Satellites: 2-1/4"...
- Page 6 ® The AM-30P is a five channel, 175 Watt, surround-sound powered Acoustimass loudspeaker, designed to be used with either the CD-20 or CD-5V Music Center. The AM-30P and CD-20 together form the complete Bose ® Lifestyle ® 30 home theater audio system. Major features of the AM-30P include: •...
- Page 7 THEORY OF OPERATION 2.2 Surround Decoder Surround channel information is audio that is recorded 180° out of phase (+90° left and -90° right) on to the left and right channels (in equal amplitude). On movie soundtracks this typically represents special effect sounds that are meant to be heard behind the listener. Center chan- nel information (movie dialogue for instance) is audio that is recorded in equal amplitude on to left and right channels that is in phase (0°...
- Page 8 THEORY OF OPERATION 2.3 Microcontroller (Refer to Figure 8 PCB Block Diagram) Upon request (via the remote control or console) the CD-20 sends out serial data commands to the AM-30P microcontroller to select mode of operation (2, 3, 5 channel), adjust volume level (master, center, or surround), and control on/off mute.
- Page 9 THEORY OF OPERATION 3.2 Audio Chain (Refer to the shcematic sheets 1 through 3 enclosed) The following discussion references the left channel electronics. Right channel operation is identical and therefore not specified. The differential input amplifier stage (op-amp U13, pins 1, 2 and 3) buffers and preamplifies the CD-20 output signal.
- Page 10 CENTER CHANNEL FREQUENCY RESPONSE FREQUENCY- - HERTZ Figure 1. Center Channel Frequency Response SURROUND CHANNEL FREQUENCY RESPONSE FREQUENCY- - HERTZ Figure 2. Surround Channel Frequency Response...
- Page 11 BASS CHANNEL LEFT/RIGHT CHANNEL FREQUENCY- - HERTZ Figure 3. Bass and Left/Right Channel Frequency Response - 10 - 15 - 20 - 25 - 30 - 35 DYNAMIC EQUALIZER FREQUENCY RESPONSE - 40 FREQUENCY- - HERTZ Figure 4. Dynamic Equalizer Frequency Response...
- Page 12 THEORY OF OPERATION 3.3 Surround Detector (Refer to schematic sheet 1) Output from differential amplifier U13 is applied to a pair of 85Hz 1st order high pass filters, one inverting, the other non-inverting. The inverting stage facilitates full wave detection in the next stage.
- Page 13 THEORY OF OPERATION 3.4 Decoder Gain Cell (Refer to Schematic sheet 2) The output of the treble control stage is applied to the input of the surround sound decoder. The decoder is made up of several stages that include U10, U11, U12, and U14. At the input of the decoder, left and right audio channels are converted to L+R and L-R signals through summing amplifier U10, pins 1, 2 and 3 and differential amplifier U10, pins 12, 13 and 14, respectively.
- Page 14 THEORY OF OPERATION The center and surround channels each pass through an independent digital volume control (internally consisting of a CMOS switched passive resistor ladder network). In five channel mode the range of the center and surround volume controls are deliberately limited, from 0 to -4dB for the center channel, and from 0 to -12dB for the surround channel.
- Page 15 THEORY OF OPERATION When the audio output voltage approaches the 17VDC power supply rail, output transistor Q382 begins to saturate and conducts much more base current than the normal maximum of 5mA. At approximately 8mA the voltage drop across 75Ω resistor R390 exceeds 0.6V and small signal transistor Q383 begins to conduct.
- Page 16 Figure 5. Voltage at Collector of Q381 (Bass Amplifier) Figure 6. Treble Control Frequency Response...
- Page 17 THEORY OF OPERATION The Class-G switching circuitry previously described for the surround channel amplifier is also controlled by the left channel amplifier. Similarly, when the left audio input exceeds a certain level, diode D475 conducts and again transistor Q175 is triggered on. Therefore, the power supply voltage that powers both amplifiers will switch high in response to a request from either amplifier.
- Page 18 THEORY OF OPERATION The thermal detect line feeds into pin 9 of the microcontroller. This is the output of a compara- tor that incorporates a thermistor to monitor the temperature of the Amplifier PCB near the heat sink. At room temperature (25°C) the thermistor resistance is 22kΩ. It forms a voltage divider with resistor array R608 (pins 3-4), and a mirrored voltage divider exists R608 (pins 1- 2) with R607 on the inverting input of the comparator (U600 pins 1, 6 and 7).
- Page 19 Figure 7. Simplified Block Diagram of Shared 2 Channel Class-G Amplifier...
- Page 20 Figure 8. PCB Block Diagram...
- Page 21 L out DC CONTROL DETECTOR L in C out DUAL VOL. CTL. S out DC CONTROL R in B out R out...
- Page 22 DISASSEMBLY/ASSEMBLY PROCEDURES Bass Module 1.6 Put your right-hand thumb into the Note: Numbers in parentheses correspond cover's bass control knob hole. Grasp the to the callouts in the Figures referred to in the front of the enclosure with your right-hand following procedures.
- Page 23 DISASSEMBLY/ASSEMBLY PROCEDURES Note: Numbers in parentheses correspond 4. Main PCB Assembly Replacement to the callouts in the Figures referred to in the following procedures. 4.1 Place the main PCB (5) onto the adapter bracket (6) component side down. 2. Cover Replacement The J5, J9, and J11 input and output connectors should be facing the label side 2.1 Place the cover (1) over the module...
- Page 24 Input and Output Connectors Module Label Side Input and Output Connectors Figure 14. Module Enclosure Disassembly Back of Module Cover Open Close Cover Latch Base Plate Tabs Base Plate Tabs Figure 15. Cover Assembly...
- Page 25 Voltage Select Switch for 115/230V Units Back of Cover Not Applicable for -13, -23, -63 Module Assemblies J8 Connector Main PCB J10 Connector, 8-Pin Cable Input and Output J5,J9,J11 Connectors Cover Latch Adhesive Side Towards (2X) the Transformer 5-Pin J7 Connector Flat Ribbon Cable Base Plate Heatsink/Amplifier PCB...
- Page 26 DISASSEMBLY/ASSEMBLY PROCEDURES Note: Numbers in parentheses correspond 6.4 Press down on the metal plate quickly to the callouts in the Figures referred to in the with both palms of your hand. The plate following procedures. Refer to Figures 14, 16, should snap into the slot of the heatsink.
- Page 27 DISASSEMBLY/ASSEMBLY PROCEDURES Note: Numbers in parentheses correspond 10. Woofer Replacement to the callouts in the Figures referred to in the following procedures. Refer to Figures 14 and 10.1 Strip the ends of the module's wiring harness (9). Connect the yellow wire to the replacement woofer's (20) + positive termi- 8.
- Page 28 DISASSEMBLY/ASSEMBLY PROCEDURES 4. Twiddler Replacement Cube Array (Satellite) Procedures 4.1 Strip the wires and connect them to Note: Numbers in parentheses correspond the replacement twiddler's terminals as to the callouts in Figure 19. follows: 1. Grille Assembly Removal 4.1.1 If replacing the top twiddler, connect the black wire to the positive 1.1 Swivel the cube array so that the grille (+) terminal and the yellow wire to the...
- Page 29 TEST SET-UP PARAMETERS Before performing the tests described in these procedures, use the following test setup parameters. SPEAKER OUTPUT LOADING All tests are to be performed with speaker outputs unloaded except for those specified in the Amplifier Test. Outputs should be loaded as listed below. POTENTIOMETER SETTINGS Potentiometers R50 (treble control) and R306 (bass control) should be set to the center position.
- Page 30 TEST PROCEDURES Note: Use test mode B unless otherwise Output Measurement Left Channel 0dB (reference) noted. Use the AM-9P audio cable 176199 ≤ -12dBr Center Channel to connect test equipment to the AM-30P. ≤ -12dBr Surround Channel ≤ -16dBr Right Channel 1.
- Page 31 TEST PROCEDURES FREQUENCY RESPONSE 9. Center Channel Frequency Response 7. Bass Channel 9.1 Apply a 2.5kHz, 50mVrms signal to the left and right inputs (in phase). 7.1 Apply a 100Hz, 30mVrms signal to the left and right inputs (in phase). 9.2 Reference a dB meter to the center channel output.
- Page 32 TEST PROCEDURES 11. Dynamic Equalization (volume control 14. Large Signal Distortion dependent). Note: Resistor loads connected only to the channel under test. 11.1 Apply a 37Hz, 1.0Vrms signal to the Channel Input Freq. Distortion left and right input (in phase). Reference a Bass 260mVrms 100Hz...
- Page 33 TEST PROCEDURES 18. Bass Module Sweep Test 18.1 Apply a 100Hz, 40mVrms signal to the module's audio input terminal. Set the bass control knob (potentiometer R306, Main PCB) to maximum. Sweep the oscillator from 40Hz to 300Hz, listening for any unusual buzz, rub, or extraneous sounds.
- Page 34 PART LIST NOTES 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 PCBs are listed in the Electrical Parts Lists. This part is critical for safety purposes. Failure to use a substitute replacement with the same safety characteristics as the recommended replacement part might create shock, fire and or other hazards.
- Page 35 MAIN PART LIST (see Figures 20 and 21) Item Desciption Part Q t y Note Number Number COVER, AM9P, REG, WHITE 172278-11 COVER, AM9P, REG, BLACK 172278-12 KNOB, TONE CONTROL, WHITE 172289-1 KNOB, TONE CONTROL, BLACK 172289-2 LATCH, COVER 172294 BASE PLATE 172288 PCB ASSY, AM-30P, 120V...
- Page 36 Figure 20. Bass Module Exploded View Voltage Select Switch for 115/230V Units Not Applicable for -13, -23, -63 Module Assemblies (2X) MAIN PCB (2X) Amplifier Subassembly Exploded View Figure 21. Module Assembly Exploded View...
- Page 37 ELECTRICAL PART LIST Resistors Reference Description Part Note Designator Number R3, 4, 129, 190, 192, 229, 290, 292, 10.0kΩ, CHIP, 0805, 5% 133626-1035 384, 610, 619, 622, 631-633, 642, 709, 715, 731 R7, 13, 15 20kΩ, CHIP, 0805, 5% 133626-2035 R9, 196, 296, 376, 394, 609, 618, 629 1MΩ, CHIP, 0805, 5% 133626-1055...
- Page 38 ELECTRICAL PART LIST Resistors (continued) Reference Description Part Note Designator Number R165, 265, 453, 511, 514, 515 23.7kΩ, 0805, 1/10W, 1% 133625-2372 R166, 266 1.47kΩ, 0805, 1/10W, 1% 133625-1471 R176, 276, 375, 476, 576 16.5kΩ, CHIP, 0805, 1% 133625-1652 R178, 179, 278, 279, 312, 313, 399, 49.9kΩ, CHIP, 0805, 1% 133625-4992 478, 479, 578, 579, 641, 643...
- Page 39 ELECTRICAL PART LIST Capacitors Reference Description Part Note Designator Number C1, 2, 123, 223, 407, 507 .033uF, 0805, X7R, 50V, 133623-333 C3, 4 4700uF, EL, BP, 85, 50V, 187394 C5, 6, 11, 12, 18-20, 28-43, 46-51, 54, .10uF, 0805, Y5V, 25V, 133624 55, 58, 59, 185, 285, 375, 379-381, 485, 585, 601, 610, 710-717...
- Page 40 ELECTRICAL PART LIST Capacitors (continued) Reference Description Part Note Designator Number C300, 385, 405, 505 .1uF, BOX, 85, 50V, 5% 137127-104 C301, 550-553 .082uF, BOX, 85, 50V, 5% 137127-823 C302 680pF, MONO, COG, 50V, 140564-681 C303 .056uF, BOX, 85, 63V, 5% 137127-563 C304 .0027uF, BOX, 85, 100V,...
- Page 41 ELECTRICAL PART LIST Diodes Reference Description Part Note Designator Number B1, 2 BRIDGE RECTIFIER 187611-001 D1, 3-6, 102, 202, 278, 375, DUAL, SOT-23, BAV99 147239 578, 601 ZENER, 12V, 225mW, 5%, 1N5242 135247-5242 D100, 101, 178, 201, 478 DUAL, SOT-23, BAV99 147239 D176, 179, 276, 279, 602 ZENER, 5.6v, 225mW, 5%, IN5232...
- Page 42 ELECTRICAL PART LIST Miscellaneous Reference Description Part Note Designator Number HEADER 134290-05 J2, 8 CONN, HEADER, RTANG, JST 16 191169-16 FEST CONN, HEADER, RTANG, JST S2P- 190552-02 CONN, HEADER, RTANG, 2.5mm 145402-08 CONN, DIN, RTANG, 8 POS 176198 CONN, HOUSING, AC, 2 POS, 146563 FEMALE CONN, HEADER, 5 POS.
- Page 43 SATELLITE PART LIST Item Description Part Q t y Note Number Number Assy Grille Assembly, Upper Black 192935-01 Grille Assembly, Upper White 192935-03 Grille Assembly, Lower Black 192935-02 Grille Assembly, Lower White 192935-04 Nameplate, Black 178725-01 Nameplate, White 178725-02 Twiddler™, 2.25" 273244-002 or 291636-001 Screw, Tapp, 4-16x.375, Pan, Xrec 181621-06...
- Page 44 PACKING PART LIST Item Description Part Q t y Note Number Number Sat Assy, Black 194420-01C Sat Assy, White 194420-02C Line Cord, 120V, US 146999 Line Cord, 230V, UK 134725 Line Cord, 230V, EU 148203 LIne Cord, 240V, AU 134726 Carton, LS30, US 188005-002 Sheet, Quick Start...
- Page 45 CD20 INSERT TAB INTO SLOT BETWEEN TOP OF DOOR AND TOP COVER CD20 Pack DUAL VOLTAGE UNITS ARE PACKED WITH A 120V AND 220V POWER PACK CD20 PACK 34 35 36 Breaks Into Two Pieces AM25P BASS BOX Satellite Assembly Pack SATELLITE ASSEMBLY PACK...
- Page 46 INTEGRATED CIRCUITS Connection Output 2 Output 1 Input 1- Input 1+ Input 2- Input 2+ Input 3- Input 3+ Input 4- Input 4+ Output 4 Output 3 Voltage Comparator P/N 137929 (LM339N) Main PCB Assembly U600, U700, U701 Amplifier PCB Assembly Function Anode Cathode...
- Page 47 INTEGRATED CIRCUITS Operational Amplifier, Quad P/N 186112 (TL074) Main PCB Assembly U6, U7, U10, U14-U16, U300, U703 Operational Amplifier, Dual P/N 132591 (CA3280) Main PCB Assembly Volume Control P/N 147622 (TC9213P) Main PCB Assembly U8, U9, U12...
- Page 48 INTEGRATED CIRCUITS Function -Vs (Power) +Vs (Power) N.C. N.C. Mute Stand-by -Vs (Signal) +Vs (Signal) Bootstrap N.C. Non-Inverting Input Inverting Input Stand-by GND Audio Power Amplifier P/N 170156 (TDA7294) Amplifier PCB Assembly U175, U275, U475, U575 EEPROM, 1KB P/N 147536 (59C11) Main PCB Assembly U602...