Bose 3-2-1 Troubleshooting Manual
Home entertainment system
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Also See for 3-2-1:
- Owner's manual (64 pages) ,
- Quick setup manual (1 page) ,
- Service manual (94 pages)
Table of Contents
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Safety Information ..................................................................................................................................... 2
Electrostatic Discharge Sensitive (ESDS) Device Handling .................................................................. 3
Theory of Operation ............................................................................................................................. 4-26
System Overview ...................................................................................................................................... 4
Console Theory of Operation .............................................................................................................. 4-19
1.0 Power Supply ...................................................................................................................................... 4
1.1. Switching Power Supplies .............................................................................................................. 5
1.2. Linear Power Supplies ..................................................................................................................... 5
1.3. Supply Synchronization .................................................................................................................. 5
1.4. Power Failure Detection .................................................................................................................. 6
2.0 Processor and Its Peripherals ............................................................................................................ 6
3.0 Communications Busses and Interface Blocks ............................................................................... 8
3.1 Communications Busses ................................................................................................................. 8
3.2 Interface Blocks ................................................................................................................................ 9
3.3 Ethernet ............................................................................................................................................ 10
4.0 Audio Path .......................................................................................................................................... 11
4.1 Analog Audio Path ........................................................................................................................... 12
4.2 Digital Audio Path ............................................................................................................................ 12
4.3 Interaction Between the Digital and Analog Inputs ...................................................................... 13
5.0 Video Path .......................................................................................................................................... 13
6.0 Tuner Electronics .............................................................................................................................. 14
6.1 Main PCB Interface ......................................................................................................................... 14
6.2 Control ............................................................................................................................................. 15
6.3 FM Tuner .......................................................................................................................................... 16
6.5 Phase-locked Loop Tuning ............................................................................................................. 18
6.6 RDS ................................................................................................................................................... 19
PS3•2•1 Series II Speaker System (Bass Module) Theory of Operation ............................................. 19
1.0 Components ...................................................................................................................................... 19
2.0 Bass Module Interface ...................................................................................................................... 19
2.1 Interface connector and cable descriptions ................................................................................. 20
2.2 3•2•1 Series II Bass Module Details ............................................................................................... 21
Test Procedures ................................................................................................................................. 27-36
Console Procedures ........................................................................................................................ 27-33
Bass Module Procedures ................................................................................................................ 34-35
Satellite Array Procedures .................................................................................................................... 36
Appendix ............................................................................................................................................. 37-51
Figure 1. 3•2•1 Series II Console Test Setup Diagram ............................................................................ 37
Figure 2. 3•2•1 Series II Bass Module Test Setup Diagram .................................................................... 38
Obtaining System Information from the Media Center Display ........................................................ 39
Computer Setup Procedure ............................................................................................................ 40-41
TAP Cable Construction ....................................................................................................................... 42
Boselink ETAP Cable Wiring Diagram ................................................................................................. 42
B+B Electronics model 232LPTTL RS232 to TTL converter .............................................................. 42
Bass Module Test Cable Construction ................................................................................................ 43
Bass Module Test Cable Wiring Information ...................................................................................... 43
Console Test Cable Construction ........................................................................................................ 44
Console Test Cable Wiring Information .............................................................................................. 44
Putting the Console into TAP mode .................................................................................................... 45
Console TAP Commands ................................................................................................................. 45-48
Changing the Region Code .................................................................................................................. 49
Console Troubleshooting Tips ............................................................................................................. 50
Bass Module Troubleshooting Tips ..................................................................................................... 51
IC Diagrams ........................................................................................................................................ 52-61
Service Manual Revision History ........................................................................................................... 62
CONTENTS
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Summary of Contents for Bose 3-2-1
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Page 1: Table Of Contents
CONTENTS Safety Information ............................. 2 Electrostatic Discharge Sensitive (ESDS) Device Handling ..............3 Theory of Operation ..........................4-26 System Overview ............................4 Console Theory of Operation ......................4-19 1.0 Power Supply ............................4 1.1. Switching Power Supplies ......................5 1.2. Linear Power Supplies ........................5 1.3. -
Page 2: Safety 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. -
Page 3: Electrostatic Discharge Sensitive (Esds) Device Handling
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 wrist straps that connect to the station or heel straps that connect to conductive floor mats. -
Page 4: Theory Of Operation
THEORY OF OPERATION System Overview • • The 3 1 Series II is a single-zone home entertainment system. It has two configurations: (1) basic/standard system with no Ethernet interface and no hard drive or uMusic function. • • This system will be available with either the standard 3 1 speaker arrays or the Gemstone speaker arrays. -
Page 5: Switching Power Supplies
THEORY OF OPERATION 1.1. Switching Power Supplies The +12V and +5V switching power supplies use ST L4973D3.3 regulator ICs (U17 [sheet 14, B5] and U2 [A6]). The power supplies are designed as step-down Buck converters. The voltage fed back to the chip on pin 13 determines the output voltage; the chip’s control circuitry will work to keep this voltage at +3.3V. -
Page 6: Power Failure Detection
THEORY OF OPERATION 1.4. Power Failure Detection It is important to detect a power failure and alert the mircoprocessor to save any relevant infor- mation and mute the power amplifiers so that no audio “pops” will be heard. The power failure detection circuit (Q2, Q3, R11, R35, R40 and R15 [sheet 14, C7]) that we employ controls an edge-triggered interrupt to the CS98200 microprocessor (U7003, pin 146 [sheet 5, C5]) to do just that. - Page 7 THEORY OF OPERATION 2.2 SDRAM U6200 [sheet 6, B/C7] is a 128Mbit with 32-bit bus wide synchronous dynamic random access memory (SDRAM) IC. For SDRAM accesses, a memory clock of up to 166 MHz that synchro- nizes data access is sent to the chip at pin 68. Data commands for accesses are coded in the M_RAS_L and M_CAS_L signals (pins 18 and 19), and data read/write selection is done by the M_WE_L signal (pin 17).
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Page 8: Communications Busses And Interface Blocks
THEORY OF OPERATION 3. Communications Busses and Interface Blocks 3.1 Communications Busses 3.1.1 I C Bus There are two I C buses: (1) the I C Debug bus for software development, the connector is J7000-NV which is not populated in production; (2) the I C configuration bus which configures the devices in audio path. -
Page 9: Interface Blocks
THEORY OF OPERATION 3.2 Interface Blocks 3.2.1 Vacuum Fluorescent Display (VFD) This vacuum fluorescent display is a custom, stand-alone VFD module manufactured by Futaba. It includes the VFD glass assembly, as well as all power supply and control/refresh electronics, and a ribbon cable interconnect to the console main board. The console VFD module interface with the Main board is by a flexible cable via connector J6500 [sheet 13, B8] which has 5-pin as listed in following table: J6500... -
Page 10: Ethernet
THEORY OF OPERATION Row Signal Column Signal Button Button Name KEYOUT KEYOUT KEYOUT KEYIN KEYIN Position ON/OFF 1 (Left) “+” (VOL_UP) SOURCE ENTER (labeled STORE on premium console) “-“ (VOL_DN) EJECT 6 (Right) 3.2.3 IR Receiver The 321 Series II console includes a narrow-band IR receiver module. The IR receiver gets the IR signal from the remote control and passes it to the Main board via the Button board. -
Page 11: Audio Path
THEORY OF OPERATION 4. Audio Path The audio path block diagram is as follows:... -
Page 12: Analog Audio Path
THEORY OF OPERATION 4.1 Analog Audio Path 4.1.1 Analog Input There are total of 7 analog input sources: 6 external analog inputs and one internal analog input. Those 6 external analog inputs are: 1 tuner from Tuner board via J6000 [sheet 13, D8], 3 external (AUX, CAB/SAT and TV) from connector J201 [sheet 10, B-D8], 2 network speaker (Zone1 and Zone2) from J202 [sheet 11, C3] via differential input buffer U8406 [B/C1]. -
Page 13: Interaction Between The Digital And Analog Inputs
THEORY OF OPERATION 4.2.2 Digital Output The AK4112 (U8001) SPDIF receiver has two output options for all the 4 external digital input sources: (1) bypass one of the 4 external SPDIF input steams to the digital MUX U8002, and (2) recover the SPDIF input stream, convert to I2S and feed to CS98200. Those two output options can be selected independently. -
Page 14: Tuner Electronics
THEORY OF OPERATION A pair of signal relays, K5000 [sheet 13, C2] and K5001 [B2], permit selection of internally generated Composite and S-Video signals or pass-through of external Composite and S-Video signal inputs to the output Composite and S-Video connector J201. When VIDEO_SEL is low, the console is configured as video pass-through mode which plays external video signals. -
Page 15: Control
THEORY OF OPERATION 6.2 Control Detailed control of the tuner is implemented by the ST72324 (U7001 [sheet 3, C6]) micropro- cessor upon instructions from the CS98200 SPI bus on the main board. U7001 is responsible for: • Handling all control commands from the main board. •... -
Page 16: Fm Tuner
THEORY OF OPERATION 6.3 FM Tuner 6.3.1 FM Tuner Front End Circuitry The FM RF signal from the antenna is input via the F or PAL-type input connector J2001 [sheet 1, B8] and goes to the FM front-end module. The antenna supplied with the console is the standard quarter-wavelength dipole antenna. - Page 17 THEORY OF OPERATION 6.3.3 FM and AM S-Meter and Stop, and Stereo Levels The FM and AM S-meter signals, pin 11 and 12 of the LA1837 respectively, are analog voltage levels that indicate the FM IF and AM RF input signal levels. These signals are connected to the A/D inputs of the ST72324.
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Page 18: Phase-Locked Loop Tuning
THEORY OF OPERATION 6.4 AM Tuner The signal from the external AM loop antenna enters through the 2.5 mm AM jack, J2000 [sheet 1, D8], and is fed to the AM front end module, T2000 [D6]. The antenna input is balanced by placing C2000 [D7] between one side of the input and ground, reducing electric field interfer- ence. -
Page 19: Rds
THEORY OF OPERATION 6.6 RDS European tuners contain additional components for the decoding of Radio Data System (RDS) information. The LC72722 Radio Data System (RDS) decoder IC, U2200 [sheet 2, D6], is a single-chip system IC that implements the signal processing required by both the European RDS standard and US RDBS system. -
Page 20: Interface Connector And Cable Descriptions
THEORY OF OPERATION 2.1 Interface connector and cable descriptions The 13-pin interface connector is wired in a one-to-one fashion with the console connector. The pins/signals are as follows: Pin Number Signal Description Wire Type/Gauge Vunreg #20AWG #20AWG 3,11 SPDIF +/- #28AWG twisted pair Mute #28AWG... -
Page 21: 3•2•1 Series Ii Bass Module Details
THEORY OF OPERATION • • 2.2 3 1 Series II Bass Module Details The bass module contains all the active audio processing and amplification electronics of the • • 1 Series II System. The rear end cap of the bass module provides access to the following components: •... - Page 22 THEORY OF OPERATION 2.2.2.1 Power rectification, pre-regulation and filtering J5 [sheet 4, D6] connects the secondary winding of the power transformer to the circuit rectifiers D7-10 [C/D 5/6], which form a full-bridge rectifier. The DC output of the rectifier charges capaci- tor C22 [D2] to a controlled peak voltage, via FET Q4 [D4].
- Page 23 THEORY OF OPERATION When the /STDBYout signal is high, the MODE pin will be either within the 3.3-6.4 volt range (mute), or near VRAW (active), as controlled by the MUTE signal and Q450, D450. When MUTE is high, Q450 saturates, causing the MODE voltage to be driven to approximately 5.4 volts.
- Page 24 THEORY OF OPERATION 2.2.2.7 S/PDIF Receiver U4400 [sheet 1, B7] provides the S/PDIF digital audio receiver function. The incoming differen- tial S/PDIF signal is fed to U4400’s differential inputs RXP0 and RXN0 through a filter and termination network. T1 is a common-mode transformer which rejects unwanted common- mode noise, particularly important since U4400 has little or no common-mode rejection inherent to the IC design.
- Page 25 THEORY OF OPERATION DSP/Amplifier PCB LED’s There are 2 LED’s in the system, located on the DSP/Amplifier board, a green LED (DS6500 [sheet 3, D7]) and an amber LED (DS6501). The amber LED is not populated in production. When the main board is installed and rear cover is in place, the light produced is visible (with practice) through the rear grille as it reflects off the heat sink as well as goes through drilled holes in the PC board.
- Page 26 THEORY OF OPERATION 2.2.2.10 DSP The DSP system comprises of the SHARC microprocessor (21065L, U7000), the FLASH memory (U7200 [sheet 2, B5]), and the SDRAM (U7300 [B/C3]). The software can essentially be broken up into two segments: The framework and the DSP functions. The framework •...
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Page 27: Test Procedures
• • Home Entertainment System (US/Canada, European, UK, Australia, Japan and Dual Voltage Standard Versions) • • 1 Series II System • • 1GS Series II System ©2005 Bose Corporation Troubleshooting Guide Reference Number 273029-TG Rev. 00 Electronic Copy Only... - Page 28 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE Bose Corporation The Mountain Framingham Massachusetts USA 01701 P/N: 273029-TG Rev. 00 3/2005 (H) http://serviceops.bose.com...
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