Bose-WaveCD-sm维修电路原理图.pdf

Bose Wave Radio/CD 100V/120V/230V/240V PCB193325 and 252178 Service Manual Part Number 250443 REV. 05 Click here to go to the table of Contents RadioFans.CN 收音机爱 好者资料库 1 CAUTION: THE BOSE WAVE RADIO/CD CONTAINS NO USER SERVICE- ABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVIC- ING TO WARRANTY SERVICE STATIONS OR FACTORY SERVICE. WARRANTY INFORMATION The Bose wave radio/CD is covered by a limited 1-year transferable warranty Manual Overview The BWR/CD was originally manufactured with PCB 193325, PCB assembly 193321-1. Later version units were manufactured with PCB 252178, PCB assembly 252441-1. Service information for both versions is included in this manual. Contents Safety Information.2 Electrostatic Discharge Sensitive (ESDS) .2 Specifications. 3-6 Theory of Operation. 7-11 Disassembly/Assembly Procedures. 12-13 Figure 1. APC PCB, ESD Solder Points .12 Test Procedures . 14-17 Figure 2. AM Test Setup .15 Part List Notes.18 Main Assembly Part List.19 Figure 3. System Exploded View.20 Electrical Part List. 21-36 Packaging Part List .37 Figure 4. Packaging View .37 Abbreviated Operating Instructions.38 Figure 5. Keyboard Schematic Diagram.39 Click here for a BWR/CD product Image RadioFans.CN 收音机爱 好者资料库 2 1. Parts that have special safety characteristics are identified by the symbol on schematics or by 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 parts are accept- ably 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 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 Laboratories (UL) 1492 (71). With the unit AC switch first in the ON position and then in 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, screwhead, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path 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 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 resis- tance with an ohmmeter between the jumped 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 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 unit must be repaired and rechecked before it is returned to the customer. SAFETY INFORMATION ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING This 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 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 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. 3 SPECIFICATIONS Physical Description Dimensions:14 W x 8.5 D x 4.375 H (35.6 x 21.6 x 11.1) cm Weight:7.4 lb (3.4 kg) Enclosure:Injection molded thermal plastic Power Specifications Input Line Voltage:120V, 60 Hz, 50W Power Consumption:? 8 W with unit switched off ? 50 W with CD player on, maximum output CD Specifications NominalLimitConditions Maximum output level2.0 V2.0 dB0 dB THD + noise.03%.08%1 kHz, -6 dB Signal to Noise Ratio95 dB90 dBA-weighted Channel reparation80 dB70 dB1 kHz Frequency response.5 dB1.0 dB20 Hz-15 kHz Low-level linearity error5.0 dB10.0 dB-90 dB De-emphasis5 kHz 16 kHz -4.53 dB -9.04 dB 2.0 dB 2.0 dB Dynamic range95 dB90 dB1 kHz, -60 dB, IEC-A, 20 kHz, LPF Defect tracking (interruption)1.0 mm.8 mmABEX test disc TCD-725R Defect tracking (black dot)1.0 mm.8 mmABEX test disc TCD-725R Defect tracking (scratch)1.6 mm1.0 mmABEX test disc TCD-721R Defect tracking (finger print)75 m65 mABEX test disc TCD-725R Defect tracking (warped disc)1.0 mm.7 mmABEX test disc TCD-732RA Defect tracking (eccentric disc)280 m210 mABEX test disc TCD-714R Cueing time2 sec3 secPhillips TS4, tracks 1-15 Tuner Specifications FM FM Antenna:75 Ohm external antenna connection, line cord functions as an FM antenna Tuning range:US: 87.7 MHz-107.9 MHz Euro: 87.7 MHz-108.0 MHz Japan: 76.0 MHz-90.0 MHz De-emphasis:US: 75 sec. Euro: 50 sec. Japan: 50 sec. Frequency steps:US: 200 kHz Euro: 50 kHz Japan: 100 kHz 4 SPECIFICATIONS FM Specification (continued) FM specifications per IHF-T-200, unless other wise noted. Measurement conditions, unless otherwise noted: RF input frequency 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 apply across the entire FM band. Table notes: 1: Environmental limits apply from =10 to +40C 2: Signal to hum ratio is defined as the ratio of signal to hum and its harmonics 3: To measure usable sensitivity with C1 present, configure power cord to run straight back from the unit for one foot and then straight downward for the remainder of the power cords length. Use an EMI filter or other method to provide RF isolation 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=F Specification ParameterNominalLimit (Ambient/ Environmental1) Sensitivity usable (C1 removed) US: Euro: Japan: 13 dBf 14 dBf 13 dBf 17/23 dBf 19/25 dBf 17/23 dBf Sensitivity usable (C1 present3) US: Euro: Japan: 15 dBf 16 dBf 15 dBf 19/25 dBf 21/27 dBf 19/25 dBf Stereo (50 dB quieting) US: Euro: Japan: 43 dBf 45 dBf 43 dBf 48 dBf 50 dBf 48 dBf Signal to noise ratio at 65 dBf Mono: Stereo: 70 dBf 65 dBf 65/60 dBf 60/55 dBf Signal to hum ratio at 65 dBf2 Mono: Stereo: 80 dBf 80 dBf 75 dBf 75 dBf Harmonic distortion (1 kHz) at 65 dBf Mono: Stereo: .3% .6% .6/2.0% 1.0/2.0% Harmonic distortion (1 kHz) at 65 dBf with ARI4 .6%1.5% Capture ratio3.0 dB4.0 dB AM rejection at 45 dBf55 dBf50 dBf Adjacent channel selectivity US: Euro: 15 dB 15 dB 10 dB 10 dB Alternate channel selectivity US: Euro: 65 dB 65 dB 60 dB 60 dB Image rejection46 dB40 dB RF intermodulation60 dB55 dB Subcarrier product rejection at 65 dBf 45 dB40 dB Frequency response 30 Hz-15 kHz 1.0 dB3.0 dB Stereo channel separation at 1 kHz30 dB20 dB Auto stop level (seek)32 dBf5/10 dBf Mono/stereo threshold42 dBf5/10 dB 5 SPECIFICATIONS (continued) AM AM Antenna:Internal bar antenna, turn unit to optimize AM reception Channel spacing:US: 10 kHz Euro: 9 kHz Japan: 9 kHz Band Limits:US: 520 kHz-1710 kHz Euro: 522 kHz-1611 kHz Japan: 522 kHz-1629 kHz Test Parameter 530-550 kHz560-590 kHz600-700 kHz710-950 kHz960-1400 kHz 1410-1610 kHz 1620-1710 kHz Usable sensitivity, dB V/m, 200 Hz HPF 55/63/69 nominal/limit/ environmental 54/59/65 nominal/limit/ environmental 51/56/62 nominal/limit/ environmental 50/55/61 nominal/limit/ environmental 49/54/60 nominal/limit/ environmental 48/53/59 nominal/limit/ environmental 50/55/61 nominal/limit/ environmental Adjacent channel selectivity, dB 42/37 nominal/limit 42/37 nominal/limit 40/35 nominal/limit 35/30 nominal/limit 35/30 nominal/limit 35/30 nominal/limit 35/30 nominal/limit Alternate channel selectivity, dB 55/50 nominal/limit 55/50 nominal/limit 55/50 nominal/limit 55/50 nominal/limit 55/50 nominal/limit 55/50 nominal/limit 55/50 nominal/limit Image rejection ratio, dB 45/40 nominal/limit 45/40 nominal/limit 45/40 nominal/limit 45/40 nominal/limit 42/37 nominal/limit 35/30 nominal/limit 35/30 nominal/limit Signal to noise, dB, at 100 dB V/M 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental 50/40/35 nominal/limit/ environmental Distortion, %, at 100 dB V/M .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental .8/1.4/2 nominal/limit/ environmental Frequency response, dB, at 50 Hz, 1.8 kHz, at 100 dB V/M -3/-6 nominal/limit -3/-6 nominal/limit -3/-6 nominal/limit -3/-6 nominal/limit -3/-6 nominal/limit -3/-6 nominal/limit -3/-6 nominal/limit Conducted susceptibility diff. mode, dB, min Com. mode, dB, min 20 25 20 25 20 25 20 25 20 25 20 25 20 25 Auto stop level, dB V/M 56565656565656 6 THD at amplifier output: <.2% at 1 kHz, at 80% of maximum output THD at line output:<.2% at 1 kHz, 2.0 Vrms AUX input Auxiliary input sensitivity: 400 mVrms at 1 kHz for full output. 2.0 Vrms maximum auxiliary input Auxiliary input impedance: 20 k Ohms Speaker output noise: 500 Vrms, maximum volume, inputs shorted Signal to noise at line output: 85 dB Volume control increments: 1.25 dB Volume control range: 78.75 dB at 1 kHz Audio SPECIFICATIONS (continued) Miscellaneous Battery backup:9 V, lasts up to 24 hours (alarm only) 7 Note: All reference designators between 0 and 50 refer to components in the power supply and power amplifier on sheet 1 of the schematic. All reference designators between 200 and 299 refer to components in the voltage regulation section on sheet 2 of the schematic. All reference designators between 300 and 399 refer to components in the tuner section on sheet 3 of the schematic. All 400 series components are located on the Micro Controller PCB, shown on sheet 4 of the schematic. All reference designators between 500 and 599 refer to components in the CD section on sheet 5 of the schematic. All reference designators between 600 and 699 refer to components in the audio section on sheet 5 of the schematic. 1.0 Overview The Wave Radio/CD is an AM/FM tuner, single disk CD player, and powered speaker system. In addition to the internal sources, external devices such as a tape deck can be connected through the units AUX input. An infrared (IR) remote control can be used to control the unit. 2.0 Power Supply Electronics AC mains are connected through the line cord attached to the polarized jack J1. The neutral wire of the line cord is used as an FM antenna coupled by C1. L1 and L2 provide isolation between the FM RF 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 different AC mains voltage requirements) and three secondary windings. The primary has a series thermal fuse 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 main audio power V and the CD motor power VMOTOR. Bridge rectifier BR1 serves dual-purposes: it full wave rectifies the AC from two ends of the first secondary (without the center tap) (creating V when filtered by C6; part of it also rectifies through the center tap creating VMOTOR (about V/2) when filtered by C16. The quiescent voltages of 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 provides backup power for the uC in case of a power outage. The switching between V and BAT+ is auto- matic through D207. +5V is regulated by U202, a voltage regulator with low dropout voltage and low quiescent 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 T1 provides power to the audio and RF electronics: a positive voltage rectified by D201 and filtered by C205; and a negative voltage rectified by D200 and filtered by C202. The positive voltage is regulated by U201 to generate +10V for the audio electronics. R208 is a dissipating element for U201. The uC controls +10V and +5VCD through Q207, D202, Q206 and Q208. In the off mode and battery backup mode the uC releases TURNON, turning off Q206 and Q208 and cons