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/

26、16”) super tweeterFrequency Range. 60 to 20,000HzMaximum Input .240WImpedance . 6Sound Pressure Level.87dB/1m 2.45V (1W/6)IGENERALPower SupplyA model. AC240V, 50HzB, G models . AC230V, 50HzPower Consumption.150W (approx. 1W when set to the standby mode)Dimensions (W X H X D)GX-900. 280 X 320 X 364mm

27、 (11” X 12-5/8” X 14-5/16”)NX-GX500. 200 X 320 X 218mm (7-7/8” X 12-5/8” X 8-9/16”)WeightGX-900. 10.5kg (23 lbs. 2 oz)NX-GX500.3.8kg (8 lbs. 6 oz)/eachAccessories . AM loop antenna X 1Indoor FM antenna X 1Remote Control Transmitter X 1Battery (size “AA”, R06) X 2Speaker Cord X 2* Specifications subj

28、ect to change without notice.* Manufactured under license from Dolby Laboratories Li-censing Corporation. “DOLBY” and the double-D symbolV are trademarks of Dolby Laboratories Licensing Cor-poration.G.European modelB . British modelA .Australian model5GX-900GX-9006IINTERNAL VIEWLeft sideTop sideq P.

29、C.B. TUNERw P.C.B. MAIN (5)e P.C.B. MAIN (1)r P.C.B. INPUT (1)t MD MECHANICAL UNITy P.C.B. MAIN (2)u P.C.B. MAIN (3)i P.C.B. MAIN (6)o DECK MECHANICAL UNIT!0 P.C.B. INPUT (2)!1 CD MECHANICAL UNIT!2 P.C.B. CDqwer tioy!0q!1!2ruuyiotGX-900GX-900IDISASSEMBLY PROCEDURES (Remove parts in the order as numb

30、ered.)Fig. 2Fig. 171. Removal of Top CoverRemove 11 screws ( q ) in Fig. 1.2. Removal of CD Mechanical Unita. Disconnect the power cord from the AC outlet.b. Push the Friction Arm ( the bottom side of the CDMechanical Unit ) with the Ejecting Tool or a tool likeas shown in Fig. 2.c. Pull the Tray fo

31、rward approx. 5cm ( 2 ) and removethe CD Lid in Fig. 2.d. Push the Tray back to the original, closed position.e. Disconnect the Flat Connecting Cables ( CB9 ) andremove 2 connectors ( CB8 and CB7 ) in Fig. 2f. Remove 4 screws ( w ) and then remove the CDMechanical Unit in Fig. 1.Ejecting Tool for CD

32、 Tray (TX946040)3. Removal of Panel Unita. Rotate the Loading Gear, then open the Tray andremove the Cassette Lid in Fig. 2.b. Push the Tray back to the original, closed position.c. Disconnect the flat connecting cables ( CB10 andCB13 ) and remove a connector ( CB805 ) in Fig. 2.d. Remove 6 screws (

33、 e and r ) and then remove thePanel Unit in Fig. 1.FRONTFrictionArmqqqqTop CoverPanel UnitCD Mechanical UnitqwweewreCB9CB8CB7CD LidCB13CB805CB10Cassette LidLoading GearuGX-900GX-900Fig. 384. Removal of Deck Mechanical Unita. Remove 4 screws ( t ) and then remove the DeckMechanical Unit in Fig. 3.b.

34、Remove 3 connectors ( W2, W3 and W4 ) in Fig. 3.ttttDeck Mechanical UnitW3W2W45. Removal of MD Mechanical Unita. Remove 3 screws ( y ) in Fig. 3 and 1 screw ( u ) inFig. 1.b. Remove 4 connectors ( CB1, CB3, CB4 and CB5 ) inFig. 3.c. Remove the MD Mechanical Unit.y(Bottom side)yMD Mechanical UnitCB3C

35、B5CB1CB46. Removal of MD Mechanisma. Disconnect the flat connecting cable in Fig. 4.b. Remove 4 screws ( i ) in Fig. 4.c. Remove 2 screws ( o ) in Fig. 4.d. Remove 2 screws ( !0 ) in Fig. 4.P.C.B. MDMD MechanismFig. 4iioo!0!0Flat connecting cableGX-900GX-9009Fig. 5Fig. 67. Operation Check of P.C.B.

36、CDa. Remove the CD Mechanical Unit.b. Remove 4 screws ( !1 ) and then remove the P.C.B. CD in Fig. 5.c. Place blocks (at 3 locations) to hold the CD Mechanical Unit horizontally as shown in the Fig. 6.d. Connect the Flat Connecting Cable ( CB9 ) and 2 connectors ( CB8 and CB7 ) in Fig. 5 and Fig. 6.

37、e. Connect the power plug and turn on the Power Switch.!1CB9CB8CB7P.C.B. CDBlockBlockP.C.B. CDBlockGX-900GX-900Fig. 8Fig. 7Fig. 98. Operation Check of P.C.B. Main (1)a. Remove the CD Mechanical Unit.b. Remove the Panel Unit.c. Remove the Deck Mechanical Unit.d. Remove the MD Mechanical Unit.e. Remov

38、e 5 screws ( !2 ) in Fig. 7.f. Remove 1 screw ( !3 ) and then remove the P.C.B. Main (2) in Fig. 8.g. Remove 3 screws ( !4 ) in Fig. 8.h. Remove 4 screws ( !5 ) and then remove the Power Transformer in Fig. 9.i. Place the main unit on its left side (viewed from the front) and remove the Bottom Cover

39、 in Fig. 10.j. Install the Panel unit to the main unit in Fig. 10.k. Connect the flat connecting cables ( CB10 and CB13 ) and remove a connector ( CB805 ) in Fig. 2.l. Connect the power plug and turn on the Power Switch.Fig. 1010!2!2!2!3!4P.C.B. Main (2)!5!5P.C.B. InputP.C.B. Main (1)CAUTIONWhen the

40、 power to this equipment is turned on with the CD/MD Mechanical Unit disconnected, the capacitor C255(4700/16) of the Main P.C.B. (CD/MD power supply section) is charged. Connecting the CD/MD P.C.B. in this state may causedamage to its IC. Therefore, when installing the CD/MD Mechanical Unit, be sur

41、e to discharge the capacitor C255(4700/16) of the Main P.C.B. before making connections. (To discharge it, short the W201 terminal +B and GND with aresistor(270 1W).)GX-900GX-9009. Removal of Tray & Traverse Unita. Remove 4 screws ( !6) and then remove the Clamp Bracket in Fig. 11.b. Remove 2 screws

42、 ( !7) and then remove the Tray Brackets in Fig. 11.c. Push the Friction Arm ( the bottom side of the CD Mechanical Unit ) with a screwdriver or the like and pull out the Trayforward as in Fig. 11.d. Remove 4 screws ( !8) and take out the Slider in Fig. 12.e. Disconnect the Flat Connecting Cable ( 1

43、6P ) and connectors ( 6P ).f. Remove the Traverse Unit in Fig. 12.!6!6CD Mechanical UnitFrictionArmClamp BracketFig. 12GPrecaution for Installation of TrayBe sure to fit the shaft of the Friction Gear intothe groove in the Tray.GInstallation of Traverse Unit & Slidera. Fit the Traverse Unit into the

44、 Chassis.b. Turn the Cam Gear until its Guide Pin comes to theposition as shown in Fig. 12.c. Fit the Slider into the Traverse Unit. Set the Spring ofthe Slider so that it holds down the Guide Pin of theCam Gear (as shown in Fig. B).(Press the Spring of the Slider once and release it,and it will hol

45、d down the Guide Pin of the Cam Gear.)d. After installation, check that the Clamp moves up anddown by turning the Load Gear.Fig. BTrayTray Bracket!7SpringSpringSpringLoad GearFRONTGrooveGuide PinOKNGTrayBracketFrictiongearShaftTraySliderTraverseUnitGuidePinCam GearFig. 11!8no markingside!8Guide PinC

46、am GearTraverseUnitSpringSliderFig. A11GX-900GX-900Fig. 15Disc Table19.4mmFig. CPick-up HeadGear ASled ShaftSled ShaftStopperFig. 1311.Removal of Cassette MechanismRemove 4 screws ( !9 ) and then pull out the CassetteMechanism in Fig. 14.12.Removal of Main MotorRemove 2 screws ( 0 ) in Fig. 14.13.Re

47、moval of Pinch RollerDetach the hook and then remove the Pinch Rollerin Fig. 15.14.Removal of Head Assya. Remove 1 screw ( 1 ) and then remove the RelayP.C.B. in Fig. 15.b. Remove 2 screws ( 2 ) and then remove the HeadAssy in Fig. 15.*Perform the adjustment of azimuth after installingthe Head Assy.

48、10.Removal of Pick-up Heada. Remove the Gear A in Fig. 13.b. Pull out the Sled Shaft and remove the Pick-up Headin Fig. 13.GCheck that the disc table height is as specifiedbelow.Fig. 1412!9!9!9!900122Pinch Roller (L)Pinch Roller (R)HookHookHead AssyGX-900GX-90013Disassembly of MD Mechanism UnitRemov

49、e the MD mechanical unit according to Steps 1 6 of the disassembly procedure (page 7).Removal of Magnetic Head (Fig.18)1. Remove a screw (A1).Cautiona. When removing the magnetic head, hold its base anddo not touch the magnetic head itself or the leafspring.b. Place the magnetic head upside down.c.

50、Use special care so as not to cause any damage tothe magnetic head when installing it.(A1)x11.7x5mmFig. 18( Q2 ) x 1( Q1 ) x 41.7 x 3mm( Q2 ) x 1( Q2 ) x 3(Q2)x1(R1)x41.7x8.9mmRemoval of MD Main P.C.B. (Fig. 16)1. Remove 4 screws (Q1).2. Remove 6 connectors (Q2).Removal of MD Mechanism (Fig.17)1. Re