Yamaha-NXSW70-hts-sm 维修电路原理图.pdf

100697SERVICE MANUALAV-S70/NX-SW70AV-S70/NX-SW70HOME THEATER SYSTEMNX-SW70 is composed of SW-AVS70 and NX-AVS70s.ICONTENTSTO SERVICE PERSONNEL .1FRONT/REAR PANELS. 12SPECIFICATIONS .3DISASSEMBLY PROCEDURES .4TEST PROGRAM MODE. 56DSP DIAG MODE . 713AV-S70 IC DATA . 1420AV-S70 BLOCK DIAGRAM . 2122SW-AVS70 BLOCK DIAGRAM .23AV-S70 PRINTED CIRCUIT BOARD . 2433SW-AVS70 PRINTED CIRCUIT BOARD . 3435AV-S70 SCHEMATIC DIAGRAM . 3639SW-AVS70 SCHEMATIC DIAGRAM.40PARTS LIST . 4154REMOTE CONTROL TRANSMITTER.55IMPORTANT NOTICEThis manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users,and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensivecomponents, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any servicerequired should be performed by an authorized YAMAHA Retailer or the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicabletechnical capabilities, or establish a principle-agent relationship of any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA arecontinually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation toretrofit. Should any discrepancy appear to exist, please contact the distributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to theground buss in the unit (heavy gauge black wires connect to this buss).IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.FRONT SPEAKER (AV-S70)SUBWOOFER(SW-AVS70)REAR SPEAKER(NX-AVS70)REAR SPEAKER(NX-AVS70)RadioFans.CN 收音机爱 好者资料库AV-S70/NX-SW70AV-S70/NX-SW70241.2 (91/2)170 (611/16)41.2(15/8)30(13/16)600 (235/8)110 (45/16)100 (315/16)10 (3/8)M AV-S701ITO SERVICE PERSONNELCritical Components Information.Components having special characteristics are marked Zand must be replaced with parts having specifications equalto those originally installed.AC LEAKAGETESTER OREQUIVALENTEQUIPMENTUNDER TESTINSULATINGTABLEWALLOUTLETIFRONT/REAR PANELSRadioFans.CN 收音机爱 好者资料库AV-S70/NX-SW70AV-S70/NX-SW70200.6 (77/8)40 (13/4)335 (133/16)24(15/16)399 (1511/16)390.1 (153/8)5.5(3/16)395.6 (159/16)100 (315/16)20 (13/16)111.5 (43/8)140 (51/2)1.4 (1/16)M SW-AVS70M NX-AVS702AV-S70/NX-SW70AV-S70/NX-SW703*TruBass and the symbol are trademarks of SRS Labs,inc. in the United States and selected foreign countries.TruBass technology is incorporated under license from SRSLabs, inc.ISPECIFICATIONSNX-SW70IAMPLIFIER SECTIONMinimum RMS Output Power per ChannelRear (1kHz, 10% THD, 6) .30W + 30WSub Woofer (100Hz, 10% THD, 4).50WIREAR SPEAKER SECTION (NX-AVS70)Type . Closed cabinet typeSpeakers . 8cm (3-1/8”) cone(Magnetic-Shielding Type)Maximum Power Handling Capacity.30WImpedance . 6Dimensions (W X H X D). 100 X 140 X 113mm (3-15/16” X 5-1/2” X 4-7/16”)Weight . 0.7kg (1 lbs. 8 oz)Finish . Gray colorISUB WOOFER SPEAKER SECTION (SW-AVS70)Type . Advanced Active Servo Technology typeSpeakers . 16cm (6-5/16”) cone(Magnetic-Shielding Type)Maximum Power Handling Capacity.50WImpedance . 4Dimensions (W X H X D).200 X395 X 399mm (7-7/8” X 15-9/16” X 15-11/16”)Weight . 9.7kg (21 lbs. 6 oz)Finish . Gray colorIGENERALPower Supply . AC230V, 50HzPower Consumption .80WAccessories . System Cord (DIN plug) X 1Speaker Cable (15m) X 2Wall Bracket X 2Bracket X 2Wing Bolt X 2Screw X 2* Specifications subject to change without notice.AV-S70IAMPLIFIER SECTIONMinimum RMS Output Power per ChannelFront (1kHz, 10% THD, 6).30W + 30WSignal to Noise Ratio (IHF-A-Network)TV.85dBTotal Harmonic Distortion (1kHz)TV to Speaker Out, 12.5W/6 . 0.08%Input Sensitivity/ImpedanceTV. 200mV/50kISPEAKER SECTIONType . Bass reflex typeSpeakers . 8cm (3-1/8”) cone x 2(Magnetic-Shielding Type)Maximum Power Handling Capacity. 30W x 2Impedance . 6IGENERALPower Supply . AC230V, 50HzPower Consumption.68WDimensions (W X H X D).600 X110 X 243mm (23-5/8” X 4-5/16” X 9-9/16”)Weight . 7.0kg (15 lbs. 7 oz)Finish . Gray colorAccessories .Pin Cord (RCA) X 1Remote Control Transmitter X 1Battery (size “AAA”, R03) X 4Fastener Tape X 2* Specifications subject to change without notice.Manufactured under license from Dolby Laboratories.Dolby, Dolby Digital, Pro Logic, and the double-Dsymbol V are trademarks of Dolby Laboratories. 1992-1997 Dolby Laboratories. All rights reserved.G . European modelB . British modelAV-S70/NX-SW70AV-S70/NX-SW7041. Removal of Grille Assembly.a. Push up the Grille Assembly with a flat tip screwdriveror the like inserted from the bottom. (Fig. 1).b. Keep pushing up the Grille Assembly gradually until itcan be removed.*The Grille Assembly is fixed securely at 8 dowels. Whenremoving it, use care not to cause a scratch or any dam-age to the main unit. When reinstalling it, apply quick-drying type bond to the dowels of the Grille Assemblyand fit it in place securely. (If it is only pushed in, it willcome off easily.)a. Removal of Grille Assembly.a. Push up the Grille Assembly with a flat tip screwdriveror the like inserted from the bottom. (Fig. 3).b. Keep pushing up the Grille Assembly gradually until itcan be removed.*The Grille Assembly is fixed securely at 6 dowels. Whenremoving it, use care not to cause a scratch or any dam-age to the main unit. When reinstalling it, apply quick-dry-ing type bond to the dowels of the Grille Assembly and fitit in place securely. (If it is only pushed in, it will come offeasily.)ISW-AVS70 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)Fig. 1Grill AssemblyqqAmplifier UnitFig. 2qewqPlate LegPlate Leg2. Removal of Amplifier Unita. Remove 4 wing screws (q) and then remove the PlateLegs (right and left). (Fig. 2)b. Remove 4 screws (w). (Fig. 2)c. Remove 7 screws (e) and then remove the AmplifierUnit. (Fig. 2)*Arrow marks are printed to identify the screws to be re-moved.2. Removal of Amplifier Unita. Remove 14 screws (r) and then remove the AmplifierUnit. (Fig. 4)*Arrow marks are printed to identify the screws to be re-moved.Fig. 3Fig. 4Grill AssemblyrAmplifier UnitBottomIAV-S70 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)AV-S70/NX-SW70AV-S70/NX-SW705ITEST PROGRAM MODE (AV-S70)1. Procedure for starting Test ProgramWith the power turned off, press the POWER key while pressing the VOLUME key and the DSP key simultaneously. Thisinitiates the Test Program function.When the Test Program is initiated, “01 DEST-Ex” appears on the FL display.2. Procedure for selecting and executing Test ProgramUsing the VOLUME + (UP) key and Volume - (DOWN) key, select the Test Program and then press the INPUT key to executeit.3. Procedure for canceling Test ProgramThere are two methods for cancellation.a. Turn off the power by pressing the POWER key of the main unit or the remote controller.b. Select the Test Program “01 DEST-Ex” and press the INPUT key for execution. (The normal mode will be restored.)4. Details of the Test Program functionDisplay01 DEST-B,G1FunctionDestination display/ test program endDestination displayJ:JaJ (Japanese)J:EnJ (English)B,G1B, G models02 FL+CLEARFL display segments all light up / BACKUP RAM CLEAR1st time: FL display segments all light up and standby LED lights up.2nd time: RAM CLEAR is executed (RAM CLEAR OK on display)* State before shipped out of the factory preset.03 FL CHECKFL display light-up check1st time: FL display segments all light up and standby LED lights up.2nd time: Even number segments and digits light up.3rd time: Odd number segments and digits light up.1st time2nd time3rd timeDSPVDIGITAL ENHANCEDVSURROUNDVPRO LOGICVIRTUAL TRUBASSV ENHANCEDSURROUNDPRO LOGICTRUBASSAV-S70/NX-SW70AV-S70/NX-SW706Display04 DSP DiagFunctionThe DSP DIAG (self-diagnosis) mode is initiated. (Refer to page 7 for the details.)05 Ver-A1.08Microprocessor version / date displayExample of microprocessor display05 Ver-A1.08Example of microprocessor date display05 99.10.15What is displayed varies depending on the microprocessor software.06 SUM47a0Check sum calculation display / re-calculation07 PrCan-OFFAll protection cancellation function ON/OFF08 Pr!CPSProtection operation history display / clearC: Center unit amplifier voltageP: Power circuit voltageS: Switch side: Normalx: Abnormal09 Cors- St.ROM collection (EEPROM) check sum calculation/calculation startWhen there is a data in the ROM collection area of EEPROM:Example of display09 Cors-288bWhen there is no data, “NON” appears on the display.*The ROM collection (EEPROM) is utilized to cope with the data area for backupand microprocessor bugs partially. The backup memory for the sound field orthe like will be retained semi-permanently even when the plug is disconnected.No data is written in the parts mounted on the product as single units.10 COR-ClearROM collection (EEPROM) data clear / clear startDisplay is provided only when there is data in the ROM collection area of EEPROM1st time: Data clear confirmation (Clear-ON? displayed)2nd time: Data clear execution (Clear:OK! displayed)After “Clear-ON?Clear-ON?Clear-ON?Clear-ON?Clear-ON?” is displayed, do not use INPUT key for execution(because the program contents will be erased).Using VOLUME + (UP) key and VOLUME - (DOWN) key, select another testprogram.*The IC for ROM collection has a role to help the microprocessor be upgraded. Ifthe written data is cleared, the old version will be restored.AV-S70/NX-SW70AV-S70/NX-SW707IDSP DIAG MODE (Self-diagnosis)Use the remote controller supplied as an accessory to select the menu.1. Procedure for starting DSP DIAGReferring to TEST PROGRAM MODE in the previous section, select/execute “04 DSP Diag”.When “04 DSP Diag” is executed, the current input name appears on the display followed by “Video” “Sel.1to9 Key”.(The DSP indicator keeps flashing.)2. Procedure for selecting Main menu and Sub-menuUsing 1 through 9 keys on the remote controller, select the main menu. Soon the sub-menu will appear on the display.Then, select the sub-menu. Every time the selected key (on the remote controller) is pressed, the sub-menu on the displaychanges.No.Main menu(Display)1Analog throughAnalog Thr.2DSP throughDsp Through3AC-3 throughAC-3 Through4Pro logicPro Logic5Speakers setSpeakers Set6Effect offEffect Off7Manual testManual Test8No function9DIAG cancelSub-menu(Display)MAIN BYPASSA.T.M.BypassDSP 0dBA.T. DSP 0dBYSS908-SRAMDspT.908SRAMYS908DspT.YSS908DSP FULL BITDspT.FullBitStatus (Binary)AC3 Analo2/0CENTER LARGEProL.CenterLEFFECT OFFProL.Eff.OffMAIN : SMALL 0dBSp.MainS 0dBMAIN : LARGE 0dBSp.MainL 0dBLFE/BASS : MAINCENTER : NONESp.Lfe:M C:NLFE/BASS : MAINSp.LfeBass:MLFE/BASS : SWFRSp.Lfe:SwfrCENTER : NONESp.Cent:NoneCENTER : SMALLREAR : SMALLSp.Ce:S Re:SEFFECT OFFEffect OffALLM.Test AllMAIN LM.Test LeftCENTERM.TestCenterMAIN RM.Test RightREAR RM.Test RearRREAR LM.Test RearLLFEM.Test Lfe3. Procedure for canceling DIAGThere are two methods for cancellation of DIAG.a. Turn off the power by pressing the POWER key of the main unit or the remote controller.b. Press the 9 key of the remote controller. (The normal mode will be restored.)AV-S70/NX-SW70AV-S70/NX-SW708Details of DIAG menu1. Analog Thr.The input is fixed to use the analog (A/D) and has 2 sub-menu items.DSP 0dBThe main L/R, C/LFE, RL/RR signals pass through the DSP section.MAIN BYPSSThe main L/R signal is output through the analog bypass without passing the DSPsection.The main L/R signal passing through the DSP is output through C/LFE and RL/RR. The shaded square means that the element included in it does not operate.AUX IN: 20dBV, Both chVOLUME:MAXCN102 (Page 30, C-4)MAIN L (1kHz): 20dBVMAIN R (1kHz): 20dBVLFE (30Hz): 34dBVREAR L (1kHz): 26dBVREAR R (1kHz): 26dBVDIR2CODEC.DACS4227YM3436CODEC.ADAC3Dav(YSS908)CS4227DECODER256K SRAMDSPANALOG INL/RL/RREAR LREAR RCENTERLFEL/RL/RDIGITAL INMAIN RMAIN LDIR2CODEC.DACS4227YM3436CODEC.ADAC3Dav(YSS908)CS4227DECODER256K SRAMDSPANALOG INL/RL/RMAIN RREAR LREAR RCENTERLFEL/RL/RDIGITAL INMAIN LAUX IN: 20dBV, Both chVOLUME:MAXCN102 (Page 30, C-4)MAIN L (1kHz): 20dBVMAIN R (1kHz): 20dBVLFE (30Hz): 34dBVREAR L (1kHz): 26dBVREAR R (1kHz): 26dBV The shaded square means that the element included in it does not operate.AV-S70/NX-SW70AV-S70/NX-SW7092. DSP ThroughIn the DIGITAL input mode, AC3/PCM AUDIO signal is automatically identified. There are 3 sub-menuitems.YSS908-SRAMThe main L/R signal is sent through AC3D2av into DSP. After passing through SRAM,the main L/R signal is output through L+R and C/LFE and RL/RR signals through(L+R)/2.YSS908-SRAMThe main L/R signal is sent through AC3D2av into DSP. The main L/R signal isoutput through L+R and C/LFE and RL/RR signals through (L+R)/2.DIR2CODEC.DACS4227YM3436CODEC.ADAC3Dav(YSS908)CS4227DECODER256K SRAMDSPANALOG INREAR LREAR RDIGITAL INMAIN RMAIN L(L+R)(L+R)/2(L+R)/2CENTERLFE(L+R)DIR2CODEC.DACS4227YM3436CODEC.ADAC3Dav(YSS908)CS4227DECODER256K SRAMDSPANALOG INL/RREAR LREAR RCENTERLFEL/RL/RL/RDIGITAL INMAIN RMAIN LAUX IN: 20dBV, Both chVOLUME:MAXCN102 (Page 30, C-4)MAIN L (1kHz): 20dBVMAIN R (1kHz): 20dBVLFE (30Hz): 34dBVREAR L (1kHz): 26dBVREAR R (1kHz): 26dBVAUX IN: 20dBV, Both chVOLUME:MAXCN102 (Page 30, C-4)MAIN L (1kHz): 20dBVMAIN R (1kHz): 20dBVLFE (30Hz): 34dBVREAR L (1kHz): 26dBVREAR R (1kHz): 26dBV The shaded square means that the element included in it does not operate.AV-S70/NX-SW70AV-S70/NX-SW7010DSP FULL BITThe main L/R is input through AC3D2av to DSP and then output through allchannels. The head margin is eliminated and the digital data is output in digital fullbit. The same applies as “YSS908” except that the digital data is output in full bitat D/A.Full bit: The digital data is normally output with a head margin for each of C and RL/RRchannels. In this menu, no head margin is used and the digital data is output in full bit so as toobtain the A/D and D/A characteristics fully. Note that this means the analog gain after D/A islarger as compared to L/R. Also, the LFE channel also outputs the signal in full bit.3. AC-3 ThroughOnly the signal of the digital system is input. The AC3 signal is decoded and reproduced according tothe input source.The AC-3 signal in each channel is AC-3 decoded and output through AC3D2av.The combined status information of the sampling frequency and the number of chan-nels of the AC3 signal appears on the Fl display.Status informationAs signal identification is executed in normal AC-3 reproduction, the source