Bose-321-321-GS-Troubleshooting-Guide 电路图 维修手册.pdf

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1、2003 Bose Corporation Reference Number 270000-TG1 Rev. 00 Service Manual 3?2?1 Home Entertainment System 3?2?1 GS Home Entertainment System (US/Canada, European, UK, Australia, Japan and Dual Voltage Versions) Electronic copy only Troubleshooting Guide RadioFans.CN 收音机爱 好者资料库 1 CONTENTS 321 and 321

2、GS Home Entertainment System Differences.2 Software Update Information .2 Safety Information .3 Electrostatic Discharge Sensitive (ESDS) Device Handling.3 Theory of Operation . 4-21 Figure 1. 3-2-1 Console Block Diagram.22 Figure 2. 321 Console Test Setup Diagram .23 Figure 3. 321 Bass Module Test S

3、etup Diagram.24 Figure 4. 321 and 321 GS Satellite Speaker Wiring Diagram.24 Test Procedures . 25-35 Figure 5. Laser Voltage Test Points .27 Figure 6. Laser Current Rating Label .27 Figure 7. AM Loop Antenna Test Setup.28 Console Main PCB troubleshooting .36 Test Cables .36 Figure 8. DVD Mechanism R

4、ear Panel .36 Figure 9. Bass Module Test Cable Wiring.37 Bass Module Test cable . 37-38 321 System Date of Manufacture Information .38 Checking Console Firmware Revisions.39 Computer Setup Procedure . 40-41 TAP Commands . 43-51 Tuner S-Meter Hexidecimal to Decimal to Voltage Conversion Charts:. 52-5

5、4 Console Main PCB Video Troubleshooting and Waveforms . 55-61 Bass Module Troubleshooting Information .62 Changing the 321 Console Region Code . 62-63 Table 1. Region Code Tap Commands and Responses.63 Parental Control Information .64 Table 2. 321 Console DVD Parental Control Rating Codes .64 Conso

6、le Display Test .64 Integrated Circuit Diagrams. 65-79 RadioFans.CN 收音机爱 好者资料库 2 CAUTION: The Bose 321 and 321 GS Home Entertainment Systems contain no user-serviceable parts. To prevent warranty infractions, refer servicing to warranty service stations or factory service. PROPRIETARY INFORMATION TH

7、IS 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. The firmware located i

8、n the main PCB and display PCBs microprocessors can be updated by means of an update CD. These update CDs are available from Bose Product and Technical Support at 800-233-4408 (Bose service centers only) or 800-367-4008 (Bose system owners) and are automatically sent out to customers who have purcha

9、sed the 3-2-1 system, filled out and returned the software update card that came with their system literature. Service centers can also download an ISO image of the latest firmware update file from the Service web site at and burn it onto a CD for use as an update disc. Once you have the CD, simply

10、power up the console, press the stop/eject button on the con- sole, place the update CD into the drawer and close it and the update process will begin. When the process is complete you may remove the update CD. Check to verify that both the display PCB firmware and the main PCB firmware have updated

11、 properly. You can do this by using the TAP commands or by a series of button presses on the console front panel. Both of these methods are outlined in the Appendix. Software Update Information 321 and 321 GS Home Entertainment System Differences The 321 and 321 GS (Gemstone) home entertainment syst

12、ems share the same basic com- ponents. The bass module and bass module cable are identical. The console uses the same electronic parts and most of the same chassis parts. The differences in the console are the console firmware and the color of the silver front bezel and DVD drawer bezel. The arrays

13、used on the two systems are different. The standard 321 system uses the larger 60mm driver arrays, and are only available in graphite. The 321 GS arrays utilize the smaller 50mm Jewel Cube driver. These arrays are available in graphite and silver. RadioFans.CN 收音机爱 好者资料库 3 SAFETY INFORMATION 1. Part

14、s 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 par

15、ts 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 tra

16、nsformer 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) 6500 / IEC 60056 paragraph 9.1.1. With the unit AC switch first in the ON position an

17、d then in OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all ex- posed 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

18、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 HAZARD THAT MUST BE ELIMI- NATED BEFORE RETURNING THE UNIT TO THE CUSTOMER. B. Insulat

19、ion 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 the jumpered AC plug and each exposed metallic cabinet part on the unit. When testing

20、 3 wire products, the resistance measured to the product enclosure should be 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 products, the resis- tance measured to exposed input/output connecto

21、rs should be between 4 and infinite MOhms. If it is not within the limits specified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING This unit contains ESDS devices

22、. 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. Avoid touching the leads or contacts of ESDS dev

23、ices or PC boards even if properly grounded. Handle boards 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. 4 1.0 Overview N

24、ote: Refer to console schematic sheets for the following information. The information inside the brackets is the grid location on the schematic sheet for the component. The 3-2-1 Home Entertainment system is a single-zone system consisting of the following components: Bass module with woofer, bass a

25、mplifier and system power supply Console with display and controller, IR remote receiver, DVD Player, video and audio decoders, AM/FM tuner, external video and audio source select, Videostage audio channel expansion, spatial and array speaker processing, speaker equalization, dynamic equalization, a

26、nd amplifiers for the array elements Two two-driver satellite speaker arrays IR remote transmitter The basic elements of the console are: - Display and display controller assembly - DVD loader mechanism and control electronics - DVD manager, Video and Audio decode circuit (DVD back end) - Video enco

27、der (video DAC) - AM/FM Tuner - Audio, Video source select circuitry - External Audio, Video Inputs, Line Out, Video Out - Audio Processor (DSP) - Array Power Amplifiers - Power Conditioning Circuits 2.0 Power Supply Electronics The power supply electronics are comprised of 4 main sections; switchin

28、g power supplies, linear power supplies, power supply synchronization, and power fail detection. The consoles input voltage, V_RAW comes from the bass module and is nominally +16VDC. This voltage varies with load and line levels, but is limited to +18V maximum (the maximum rated operating voltage of

29、 the power amplifier). This voltage is always present whenever the bass module is plugged into the wall and so the consoles power supplies are likewise active. THEORY OF OPERATION Node Name VoltageTypeInputOutputs V_RAW+16Linear120VACPower Amp,+12V,+10V,+5.1V, +3.3V +12V+11.5SwitchingV_RAWDVD drive

30、motors, +9V +10V+10LinearV_RAWAM/FM tuner, FM front-end +9V+9Linear+12Sallen-and-Key Filter opamps, Opamp package with “Codec_bias”, Bass eq output buffer, and Analog input buffers, AV Mux +5V+5SwitchingV_RAWDVD drive logic, Display Board, CODEC, Stereo DAC, SPDIF IC, EEPROM, RDS IC +3.3V+3.3Switchi

31、ngV_RAWDSP, CS98000 I/O, Flash, DRAM ICs, Quad Inverter, Quad XOR, CODEC, SPDIF, MUX, Tuner PLL IC, Video DAC, 2.5V +2.5V+2.5Linear+3.3CS98000 core, PLL circuits 5 Voltage on V_RAW is modulated by the load placed on it and can temporarily dip well below +13V during audio playback at loud volumes. Fo

32、r this reason, the switching power supply labeled 12V is actually supplying 11.5V to maximize headroom and still comply with the DVD players operating specifications. The 2.5V linear regulator is connected to the 3.3V line to increase efficiency and, therefore, minimize heat dissipation. The 9V rail

33、 is derived from the +12V line for the same reason, as well as to reduce power supply ripple getting through the AV mux to its outputs. The 10V linear regulator is connected to V_RAW to provide adequate headroom. Console Power Supply Architecture The power supplied by each rail varies depending on w

34、hat mode the system is in. A summary of typical power drawn by rail is given below. Also included for reference is the power drawn by the bass box (120V). Note: Power supplied by rail (with system muted) THEORY OF OPERATION RAIL MODE120VVraw12V5V3.3V10V9V2.5V Standby21.8W12.5W1.3W2.3W3.2W.6W *.7W1.2

35、W DVD25.4W15.2W1.9W4.0W3.4W.6W *.7W1.3W CD25.2W13.4W1.9W4.0W3.3W.6W *.7W1.2W FM22.2W12.7W1.3W2.5W3.2W.6W *.7W1.2W AM21.6W12.3W1.3W2.5W3.2W.3W *.7W1.2W AUX22.2W12.7W1.3W2.5W3.2W.6W *.7W1.2W * The power supplied by the 10V rail is dependent on the last mode the tuner was in. Vraw, 120V, and the 10V ra

36、il all drop by approximately .3W if the tuner was in AM mode last as opposed to FM. Bass box Power fail detect CS98000POWER_FAIL 3.3V 5V 12V 2.5V 9V 10V F_SYNC2F_SYNC1 SYNC_ PULSE DSPAM station info U7000 Q1Q4 Vraw U1 U2 U89 U4 U5003 U25 U3000 Q2, Q3 6 2.1. Switching Power Supplies The switching pow

37、er supplies use ST L4973D3.3 regulator ICs U1 sheet 11, C6, U2 sheet 11, A6, and U89 sheet 11, D3. 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 chips control circuitry will work to keep this voltage at +3.

38、3V. The +5.1V and +12V supplies use resistor divide-down networks to obtain the +3.3V feedback voltage. The reference designators listed below correspond to the +12V regulator on the tuner board; the designs of the +5.1V and +3.3V regulators are nearly identical. A number of additional series induct

39、ors and parallel capacitors exist to provide filtering functions. There are two 750 Ohm resistors (R115 and R116 sheet11, C1) tied between +12V and ground to keep the 12V switcher operating correctly under light load conditions. Without these ballast resistors, under light load, there is not enough

40、current flowing to charge the bootstrap capacitor and the D-MOS does not turn on fully. The compensation networks used for these switching power supplies have been chosen to provide stability under all conditions as well as to provide minimal RF interference to the tuner. The supplies function in both continuous and discontinuous mode depending on the load. 2.2. Linear Power Supplies The linear power supplies are the standard 7800 series TO-220 packages with the exception of the 2.5V linear regulator (U4 sheet 11, C3). The 2.5V linear regulator is a