Yamaha-GX900-cs-sm 维修电路原理图.pdf
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1、GX-900GX-900100674SERVICE MANUALGX-900MINI COMPONENT SYSTEMIMPORTANT 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, arealread
2、y 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 inpersonal injury, destruction of expensive components, and failure of the product to perform as specified.For these re
3、asons, we advise all YAMAHA product owners that any service required should be performedby 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, certifica-tion or recognitio
4、n of any applicable technical capabilities, or establish a principle-agent relationshipof any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, andservice departments of YAMAHA are continually striving to improve YAMAHA
5、 products. Modifications are, therefore,inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear toexist, please contact the distributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any stat
6、ic electricity your body may haveaccumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to thisbuss).IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to theunit.ICONTENTSTO SERVICE PERSONNEL .12FRO
7、NT PANELS .3REAR PANELS .4SPECIFICATIONS .5INTERNAL VIEW .6DISASSEMBLY PROCEDURES .716VOLUME RANGE .17SYSTEM CONTROL CHECK .17TEST MODE .18SYSTEM TEST MODE.18RECEIVER TEST MODE .1920TAPE TEST MODE .20CD TEST MODE .21ALL FUNCTION TEST MODE.22CD ERROR MESSAGES .22CD STANDARD OPERATION CHART .2326TAPE
8、ADJUSTMENTS .2729MD TEST MODE & ADJUSTMENTS .3037MD ERROR DISPLAY .3839MD TROUBLESHOOTING.4044IC DATA .4558DISPLAY DATA .59BLOCK DIAGRAM .6065MD TEST POINT WAVEFORM .6667PRINTED CIRCUIT BOARD .6882PIN CONNECTION DIAGRAM .83SCHEMATIC DIAGRAM .8490PARTS LIST .91117GREASE APPLICATION DIAGRAM.118120REMO
9、TE CONTROL TRANSMITTER.121NX-GX500.122、認定再生紙使用。This Service Manual uses recycled paper.GX-900 is composed of GX-900 and NX-GX500.RadioFans.CN 收音机爱 好者资料库GX-900GX-900ITO SERVICE PERSONNEL1. Critical Components Information.Components having special characteristics are marked andmust be replaced with pa
10、rts having specifications equal tothose originally installed.CD Laser Diode PropertiesGMaterial: GaAlAsGWavelength: 780 nmGEmission Duration : ContinuousGLaser Output: max. 44.6 W* This output is the value measured at a distance ofabout 200 mm from the objective lens surface onthe Optical Pick-up Bl
11、ock.CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSESPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.THE COMPACT DISC PLAYER/MINI DISC RECORDER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONEEXCEPT PROPERLY QUALIFIED SERVICE PERSONNEL.1q B, G modelsw B,
12、G modelsAC LEAKAGETESTER OREQUIVALENTEQUIPMENTUNDER TESTINSULATINGTABLEWALLOUTLETMD Laser Diode PropertiesGMaterial: GaAlAsGWavelength: 785 nmGPulse time:Read mode .0.8 mW ContinuousWrite mode .max 10 mW 0.5Smin cycle 1.5SRepetitionPROTECTION OF EYES FROM LASER BEAM DURING SERVICINGThis set employs
13、a laser. Therefore, be sure to carefully follow the instructions below when servicing .When checking the laser diode emission, keep your eyes more than 30 cm away from the objective lens.RadioFans.CN 收音机爱 好者资料库GX-900GX-9002w A, B, G modelsEnglishTHIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION)
14、 INFORMS THE USER THAT THE APPARATUSCONTAINS A LASER COMPONENT.THIS LABEL (SEE POSITION SHOWN IN THE ILLUSTRATION) WARNS THAT ANY FURTHER PROCEDURE WILLBRING THE USER INTO EXPOSURE WITH THE LASER BEAM.CAUTION : USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSESPECIFIED HEREI
15、N, MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.SwedishDENNA MRKNING (SE FIGUR) UPPLYSER OM ATT DET I APPARATEN INGR EN LASERKOMPONENT AVTYP KLASS 1.VARNINGSMRKNING (SE FIGUR) FR STRLNING. INGREPP I APPARATEN BR ENDAST FRETAGAS AVFACKMAN MED KNNEDOM OM LASER. APPARATEN INNEHLLER EN LASERKOMPONENT SOM
16、AVGERSTRLNING VERSTIGANDE GRNSEN FR LASERKLASS 1.VARNING : OSYNLIG LASERSTRLNING NR DENNA DEL R PPNAD OCH SPRREN R URKOPPLAD.STIRRA EJ I STRLEN OCH BETRAKTA EJ STRLEN GENOM OPTISKT INSTRUMENT.DanishDETTE MRKAT ER ANBRAGT SOM VIST I ILLUSTRATIONEN FOR AT ADVARE BRUGEREN OM AT AP-PARATET INDEHOLDER EN
17、 LASERKOMPONENT.DETTE MRKAT OM LASEREN ER ANBRAGT P APPARATET SOM EN OPLYSNING OM AT APPARATETINDEHOLDER ET LASERKOMPONENT.ADVARSEL : USYNLIG LASERSTRLING VED BNING, NR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION.SE IKKE IND I STRLEN-HELLER IKKE MED OPTISKE INSTRUMENTER.ADVARSEL : USYNLIG LASERSTRLING NR
18、 DEKSEL PNES OG SIKKERHEDSLS BRYTES. STIRR IKKE INNI STRLEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.FinnishVARO! :AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NKYMTTMLLE LASER-STEILYLLE.L TUIJOTA STEESEEN LK KATSO SIT OPTISEN LAITTEEN LPI.GX-900GX-900IFRONT PANELSM B, G modelsM A model311
19、A B CD E FG H I J K LM N OP Q RS T UV W XY Z/22334455667788R. TIMECEDITD+I0EMODEREPEATRANDOMSPACETUNERDISC SKIPPOWERSLEEPINPUTVOLUME90PRESETTIMEAPROGBCD/IYMERSIONBASS BOOSTMUSICINPUT MODEMMARKSCROLLTAPEMDREC/PAUSEENTERDELETEREC/PAUSEDIRECTIONMD EDITSYS20200(7-7/8)320(12-5/8)GNX-GX500GX-900GX-900M A
20、modelM B, G models4343(13-1/2)12(1/2)9(3/8)364(14-5/16)100(3-15/16)172(6-3/4)280(11)320(12-5/8)IREAR PANELSGX-900GX-900ISPECIFICATIONSIAMPLIFIER SECTIONMinimum RMS Output Power per Channel1kHz, 0.9% THD, 6 .80W + 80W1kHz, 10% THD, 6 .100W + 100WInput Sensitivity/ImpedanceAUX. 200mV/47kSpectrum Analy
21、zed Band . 5 band(100Hz, 350Hz, 1kHz, 3.5kHz, 10kHz)ITUNER SECTIONFM Tuning Range . 87.50 to 108.00MHzAM Tuning Range . 531 to 1,611kHzFM Usable Sensitivity (75)DIN Mono, S/N 30dB .1.8VICD CHANGER SECTIONType . 3-Disc Carousel Auto-changerSignal Readout.Non-contact,3-beam semi-conductor laser pick-u
22、pD/A Converter. 1bit DACFilter .8-time oversampling digital filterWow & Flutter .UnmeasurableLaser Diode PropertiesMeterial : GaALAsWavelength : 780 nmEmission Duration : continuousLaser Output : max. 44.6 W* This output is the value measured at a distance of about200 mm from the objective lens surf
23、ace on the OpticalPick-up Block.ITAPE DECK SECTIONType . Auto Reverse4-Track 2-Channel playback/recording stereo Cassette DeckHeadsREC/PB. Hard permalloyErase. Double Gap FerriteMotorsMain . DC servo motorTray Loading . DC motorWow & FlutterW.PEAK . 0.19%W.RMS. 0.09%Frequency Response (20dB)Type I/N
24、ormal tape. 50 to 15,000Hz 3dBType II/High (CrO2) tape . 50 to 16,000Hz 3dBS/N RatioNR off.58dBDolby B NR on.66dBIMD SECTIONSystem .Minidisc digital audio systemRecording Method .Magnetic field moduration overwriteReading Method . Non-contact optical pick upCoding.ATRAC (Adaptive TRansform Acoustic
25、Coding)Laser Diode PropertiesMeterial : GaALAsWavelength : 785 nmPulse time :Read mode.0.8 mW continuousWrite mode .max. 10 mW 0.5Smin. cycle 1.5SRepetitionISPEAKER SECTION (NX-GX500)Type . 3-Way Bass-reflex Design(Magnetic-Shielding Type)Speakers . 13cm (5-1/8”) woofer5cm (1-15/16”) tweeter2cm (13/
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