Bose-WaveCD-sm维修电路原理图.pdf

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1、Bose Wave Radio/CD100V/120V/230V/240VPCB193325 and 252178Service ManualPart Number 250443 REV. 05Click here to go to thetable of ContentsRadioFans.CN 收音机爱 好者资料库1CAUTION: THE BOSE WAVE RADIO/CD CONTAINS NO USER SERVICE-ABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVIC-ING TO WARRANTY SERVICE

2、STATIONS OR FACTORY SERVICE.WARRANTY INFORMATIONThe Bose wave radio/CD is covered by a limited 1-year transferable warrantyManual OverviewThe BWR/CD was originally manufactured with PCB 193325, PCB assembly 193321-1. Laterversion units were manufactured with PCB 252178, PCB assembly 252441-1. Servic

3、e informationfor both versions is included in this manual.ContentsSafety Information.2Electrostatic Discharge Sensitive (ESDS) .2Specifications. 3-6Theory of Operation. 7-11Disassembly/Assembly Procedures. 12-13Figure 1. APC PCB, ESD Solder Points .12Test Procedures . 14-17Figure 2. AM Test Setup .1

4、5Part List Notes.18Main Assembly Part List.19Figure 3. System Exploded View.20Electrical Part List. 21-36Packaging Part List .37Figure 4. Packaging View .37Abbreviated Operating Instructions.38Figure 5. Keyboard Schematic Diagram.39Click here for a BWR/CD product ImageRadioFans.CN 收音机爱 好者资料库21. Part

5、s that have special safety characteristics are identified by the symbol on schematics orby special notes in the part lists. Use only replacement parts that have critical characteristics recom-mended by the manufacturer.2. Make leakage current or resistance measurements to determine that exposed part

6、s are accept-ably insulated from the supply circuit before returning the unit to the customer. Use the followingchecks to perform these measurements:A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line corddirectly into a 120V AC outlet. (Do not use an isolation transf

7、ormer during this test.) Use a leakagecurrent tester or a metering system that complies with American National Standards Institute (ANSI)C101.1 “Leakage Current for Appliances” and Underwriters Laboratories (UL) 1492 (71). With theunit AC switch first in the ON position and then in OFF position, mea

8、sure from a known earthground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handlebracket, metal cabinet, screwhead, metallic overlays, control shafts, etc.), especially any exposedmetal parts that offer an electrical return path to the chassis. Any current meas

9、ured must not exceed0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTSNOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THATMUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.B. Insulation Resistance Test Cold Check-(1) Unp

10、lug the power supply and connect a jumper wirebetween the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resis-tance with an ohmmeter between the jumped AC plug and each exposed metallic cabinet part onthe unit. When the exposed metallic part has a return path to t

11、he chassis, the reading should bebetween 1 and 5.2 Meg ohms. When there is no return path to the chassis, the reading must be“infinite”. If it is not within the limits specified, there is the possibility of a shock hazard, and the unitmust be repaired and rechecked before it is returned to the custo

12、mer.SAFETY INFORMATIONELECTROSTATIC DISCHARGE SENSITIVE (ESDS)DEVICE HANDLINGThis unit contains ESDS devices. We recommend the following precautions when repairing, replac-ing or transporting ESDS devices: Perform work at an electrically grounded work station. Wear wrist straps that connect to the s

13、tation 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 boards by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unprotected devices into ma

14、terials such as plastic, polystyrene foam, clear plastic bags, bubble wrap or plastic trays.3SPECIFICATIONSPhysical DescriptionDimensions:14 W x 8.5 D x 4.375 H (35.6 x 21.6 x 11.1) cmWeight:7.4 lb (3.4 kg)Enclosure:Injection molded thermal plastic Power SpecificationsInput Line Voltage:120V, 60 Hz,

15、 50WPower Consumption:? 8 W with unit switched off? 50 W with CD player on, maximum outputCD SpecificationsNominalLimitConditionsMaximum output level2.0 V2.0 dB0 dBTHD + noise.03%.08%1 kHz, -6 dBSignal to Noise Ratio95 dB90 dBA-weightedChannel reparation80 dB70 dB1 kHzFrequency response.5 dB1.0 dB20

16、 Hz-15 kHzLow-level linearity error5.0 dB10.0 dB-90 dBDe-emphasis5 kHz16 kHz-4.53 dB-9.04 dB2.0 dB2.0 dBDynamic range95 dB90 dB1 kHz, -60 dB, IEC-A, 20 kHz, LPFDefect tracking (interruption)1.0 mm.8 mmABEX test disc TCD-725RDefect tracking (black dot)1.0 mm.8 mmABEX test disc TCD-725RDefect tracking

17、 (scratch)1.6 mm1.0 mmABEX test disc TCD-721RDefect tracking (finger print)75 m65 mABEX test disc TCD-725RDefect tracking (warped disc)1.0 mm.7 mmABEX test disc TCD-732RADefect tracking (eccentric disc)280 m210 mABEX test disc TCD-714RCueing time2 sec3 secPhillips TS4, tracks 1-15Tuner Specification

18、sFMFM Antenna:75 Ohm external antenna connection, line cordfunctions as an FM antennaTuning range:US: 87.7 MHz-107.9 MHzEuro: 87.7 MHz-108.0 MHzJapan: 76.0 MHz-90.0 MHzDe-emphasis:US: 75 sec.Euro: 50 sec.Japan: 50 sec.Frequency steps:US: 200 kHzEuro: 50 kHzJapan: 100 kHz4SPECIFICATIONSFM Specificati

19、on(continued)FM specifications per IHF-T-200, unless other wise noted. Measurement conditions, unless otherwise noted: RF inputfrequency 98.1 MHz, audio frequency 1 kHz, RF input level 65 dBf, 75 kHz Deviation: Mono 75 kHz, stereo 67.5 kHz,7.5 kHz pilot. The performance specifications listed below a

20、pply across the entire FM band.Table notes:1: Environmental limits apply from =10 to +40C2: Signal to hum ratio is defined as the ratio of signal to hum and its harmonics3: To measure usable sensitivity with C1 present, configure power cord to run straight back from the unit for one foot andthen str

21、aight downward for the remainder of the power cords length. Use an EMI filter or other method to provide RFisolation at the wall outlet.4: Use the standard European Broadcast Union ARI signal with 5 kHz signal on. DK signal on and BK signal code=FSpecification ParameterNominalLimit(Ambient/Environme

22、ntal1)Sensitivity usable (C1 removed)US:Euro:Japan:13 dBf14 dBf13 dBf17/23 dBf19/25 dBf17/23 dBfSensitivity usable (C1 present3)US:Euro:Japan:15 dBf16 dBf15 dBf19/25 dBf21/27 dBf19/25 dBfStereo (50 dB quieting)US:Euro:Japan:43 dBf45 dBf43 dBf48 dBf50 dBf48 dBfSignal to noise ratio at 65 dBfMono:Ster

23、eo:70 dBf65 dBf65/60 dBf60/55 dBfSignal to hum ratio at 65 dBf2Mono:Stereo:80 dBf80 dBf75 dBf75 dBfHarmonic distortion (1 kHz) at 65dBfMono:Stereo:.3%.6%.6/2.0%1.0/2.0%Harmonic distortion (1 kHz) at65 dBf with ARI4.6%1.5%Capture ratio3.0 dB4.0 dBAM rejection at 45 dBf55 dBf50 dBfAdjacent channel sel

24、ectivityUS:Euro:15 dB15 dB10 dB10 dBAlternate channel selectivityUS:Euro:65 dB65 dB60 dB60 dBImage rejection46 dB40 dBRF intermodulation60 dB55 dBSubcarrier product rejection at65 dBf45 dB40 dBFrequency response30 Hz-15 kHz1.0 dB3.0 dBStereo channel separation at 1 kHz30 dB20 dBAuto stop level (seek

25、)32 dBf5/10 dBfMono/stereo threshold42 dBf5/10 dB5SPECIFICATIONS(continued)AMAM Antenna:Internal bar antenna, turn unit to optimize AMreceptionChannel spacing:US: 10 kHzEuro: 9 kHzJapan: 9 kHzBand Limits:US: 520 kHz-1710 kHzEuro: 522 kHz-1611 kHzJapan: 522 kHz-1629 kHzTestParameter530-550 kHz560-590

26、 kHz600-700 kHz710-950 kHz960-1400kHz1410-1610kHz1620-1710kHzUsablesensitivity,dB V/m, 200Hz HPF55/63/69nominal/limit/environmental54/59/65nominal/limit/environmental51/56/62nominal/limit/environmental50/55/61nominal/limit/environmental49/54/60nominal/limit/environmental48/53/59nominal/limit/environ

27、mental50/55/61nominal/limit/environmentalAdjacentchannelselectivity,dB42/37nominal/limit42/37nominal/limit40/35nominal/limit35/30nominal/limit35/30nominal/limit35/30nominal/limit35/30nominal/limitAlternatechannelselectivity,dB55/50nominal/limit55/50nominal/limit55/50nominal/limit55/50nominal/limit55

28、/50nominal/limit55/50nominal/limit55/50nominal/limitImagerejectionratio, dB45/40nominal/limit45/40nominal/limit45/40nominal/limit45/40nominal/limit42/37nominal/limit35/30nominal/limit35/30nominal/limitSignal tonoise, dB,at 100 dBV/M50/40/35nominal/limit/environmental50/40/35nominal/limit/environment

29、al50/40/35nominal/limit/environmental50/40/35nominal/limit/environmental50/40/35nominal/limit/environmental50/40/35nominal/limit/environmental50/40/35nominal/limit/environmentalDistortion,%, at 100 dBV/M.8/1.4/2nominal/limit/environmental.8/1.4/2nominal/limit/environmental.8/1.4/2nominal/limit/envir

30、onmental.8/1.4/2nominal/limit/environmental.8/1.4/2nominal/limit/environmental.8/1.4/2nominal/limit/environmental.8/1.4/2nominal/limit/environmentalFrequencyresponse,dB, at 50 Hz,1.8 kHz, at100 dB V/M-3/-6nominal/limit-3/-6nominal/limit-3/-6nominal/limit-3/-6nominal/limit-3/-6nominal/limit-3/-6nomin

31、al/limit-3/-6nominal/limitConductedsusceptibilitydiff. mode,dB, minCom. mode,dB, min2025202520252025202520252025Auto stoplevel, dBV/M565656565656566THD at amplifieroutput:.2% at 1 kHz, at 80% of maximumoutputTHD at line output:.2% at 1 kHz, 2.0 Vrms AUX inputAuxiliary inputsensitivity:400 mVrms at 1

32、 kHz for full output. 2.0Vrms maximum auxiliary inputAuxiliary inputimpedance:20 k OhmsSpeaker outputnoise:500 Vrms, maximum volume, inputsshortedSignal to noise atline output:85 dBVolume controlincrements:1.25 dBVolume controlrange:78.75 dB at 1 kHzAudioSPECIFICATIONS(continued)MiscellaneousBattery

33、 backup:9 V, lasts up to 24 hours (alarm only)7Note: All reference designators between 0 and 50 refer to components in the power supply andpower amplifier on sheet 1 of the schematic. All reference designators between 200 and 299 refer tocomponents in the voltage regulation section on sheet 2 of the

34、 schematic. All reference designatorsbetween 300 and 399 refer to components in the tuner section on sheet 3 of the schematic. All 400series components are located on the Micro Controller PCB, shown on sheet 4 of the schematic. Allreference designators between 500 and 599 refer to components in the

35、CD section on sheet 5 ofthe schematic. All reference designators between 600 and 699 refer to components in the audiosection on sheet 5 of the schematic.1.0 OverviewThe Wave Radio/CD is an AM/FM tuner, single disk CD player, and powered speaker system. Inaddition to the internal sources, external de

36、vices such as a tape deck can be connected through theunits AUX input. An infrared (IR) remote control can be used to control the unit.2.0 Power Supply ElectronicsAC mains are connected through the line cord attached to the polarized jack J1. The neutral wire ofthe line cord is used as an FM antenna

37、 coupled by C1. L1 and L2 provide isolation between the FMRF input and the transformer T1. A slow acting fuse F1 is connected between J1 and the non-polarized jack J2 to protect against faults.Transformer T1 is a round core (R-core) transformer with one primary winding (unique for differentAC mains

38、voltage requirements) and three secondary windings. The primary has a series thermalfuse to protect against overload and faults. Two of the three secondary windings have center taps.Polarized jack J3 ensures the correct connection of the pins from T1.The first secondary winding of T1 provides the ma

39、in audio power V and the CD motor powerVMOTOR. Bridge rectifier BR1 serves dual-purposes: it full wave rectifies the AC from two ends ofthe first secondary (without the center tap) (creating V when filtered by C6; part of it also rectifiesthrough the center tap creating VMOTOR (about V/2) when filte

40、red by C16. The quiescent voltagesof V and VMOTOR are about 15VDC and 7.5VDC, respectively. V provides power to the uC elec-tronics (+5V) and the CD electronics (+5VCD). A 9V battery connected to J200 also providesbackup power for the uC in case of a power outage. The switching between V and BAT+ is

41、 auto-matic through D207. +5V is regulated by U202, a voltage regulator with low dropout voltage and lowquiescent current characteristics. Such characteristics are necessary to extend the battery life.+5VCD is regulated by U203. R212 is a dissipating element for U203.The second secondary winding of

42、T1 provides power to the audio and RF electronics: a positivevoltage rectified by D201 and filtered by C205; and a negative voltage rectified by D200 and filteredby C202. The positive voltage is regulated by U201 to generate +10V for the audio electronics. R208is a dissipating element for U201. The

43、uC controls +10V and +5VCD through Q207, D202, Q206and Q208. In the off mode and battery backup mode the uC releases TURNON, turning off Q206and Q208 and consequently +10V and +5VCD. In any other mode the uC asserts TURNON. Thenegative voltage is regulated by U200 to provide -15V for the audio elect

44、ronics. A reference voltageof -20.6V is created by the 5.6V zener diode ZR200 and R201 between -15V and the negativevoltage. This -20.6V reference is buffered by Q202 to make -20V for the VFD electronics. The VFD“center tap voltage” CT is generated from -15V by Q201. The uC controls the brightness o

45、f the VFDpartly by changing the CT voltage. It does so through AUD-DATA, Q210 and the resistor networkR231 and R232. AUD-DATA from the uC is multiplexed and filtered by R230 and capacitor C231.Normally in a bright environment, AUD-DATA is filtered to be high so Q210 is turned off. The base ofTHEORY

46、OF OPERATION8Q201 is at the same voltage as -15V. Consequently CT is at about -14.4V. In a dark environment,AUD-DATA is filtered to be low so Q210 is turned on. The presence of +5V at the resistor networkchanges the voltage at the base of Q201. CT is increased to about -9V, consequently reducing the

47、display brightness.The third secondary winding of T1 provides AC power to the VFD filaments. It is nominally 5.3VAC.The center tap is connected to CT so that the VFD filaments are negatively biased.R200 is used to protect Q201 at power up. R207, R211 and R214 are fusible resistors protectingagainst

48、faults.A line frequency signal (60 Hz) is generated from the secondary MAIN. MAIN is filtered by R205and C215, clamped by D206, and buffered by Q200. 60 Hz (60 Hz or 50 Hz depending on the ACmains) is used by the uC to keep time and to detect a power failure.3. Control ElectronicsThe embedded micro-

49、controller (uC) used in this system is a Toshiba TMP87xx14F, where the xxdigits define whether it is an OTP or a masked part. The main system power supply and the batteryare connected to a low dropout low quiescent current regulator through D207; when the main powersupply drops below the battery lev

50、el, the battery will drive the uC. U403 is an automatic reset chipthat monitors the 5 volts at the uC and will pull pin 29 of the uC (RESET) low if the voltage dropsbelow 4.75 volts; it also supplies the power-on reset pulse. CF401 is an 8.00 MHz ceramic resonatorwith built in capacitors.U401 is an