Yamaha GX-500 Service Manual

GX-900GX-900100674SERVICE MANUALGX-900MINI COMPONENT SYSTEMIMPORTANT NOTICEThis manual has been provided for the use of authorized YAMAHA Retailers an

GX-900GX-9009Fig. 5Fig. 67. Operation Check of P.C.B. CDa. Remove the CD Mechanical Unit.b. Remove 4 screws ( !1 ) and then remove the P.C.B. CD in Fi

● Grease to be suppliedThe same grease as that originally used is notavailable but a substitutive grease is supplied in-stead. When using this grease,

ABCDEFGH123456GX-900REMOTE CONTROL TRANSMITTER SCHEMATIC DIAGRAMR12.2ΩKI/O6KI/O7S0REMVDDX OUTX INVSSKI/O5KI/O4KI/O3KI/O2KI/O1KI/O0KI3KI2KI1KI01234567

GX-900GX-900123Parts List for Carbon Resistors1/4W TypeHJ3510mm1/6W TypeHF855mm1/4W TypeHF451/6W Type Part No.HF45 7100HF45 7110HF85 7120HF45 7130HF45

GX-900GX-900

GX-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 Mechan

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 ( !7 ) and

GX-900GX-900Fig. 15Disc Table19.4mmFig. CPick-up HeadGear ASled ShaftSled ShaftStopperFig. 1311.Removal of Cassette MechanismRemove 4 screws ( !9 ) an

GX-900GX-90013Disassembly of MD Mechanism UnitRemove the MD mechanical unit according to Steps 1 ~ 6 of the disassembly procedure (page 7).Removal of

GX-900GX-90014Removal of Cartridge Holder (Fig.19)1. Open the roller arm lever in the arrow direction and move the clamper lever to the rear.2. With a

GX-900GX-90015Removal of Mechanism SW P.C.B. (Fig.20)• Once the mechanism switch P.C.B. is removed, it willbe necessary to perform “Adjustment of Lead

GX-900GX-90016Removal of Optical Pickup Head (Fig.23 and Fig.24)1. Remove 3 screws (F1).CautionUse care so as not to cause any damage to the gear.(The

GX-900GX-900DISPLAYVOL MINVOL 01VOL 02VOL 03VOL 04VOL 05VOL 06VOL 07VOL 08VOL 09dB– ∞–79–73–68–64–61–59–58–57–56DISPLAYVOL 10VOL 11VOL 54VOL 55dB–55–5

GX-900GX-900 TEST MODETo facilitate inspection, measurement and location of any faulty point, 6 types of built-in Test Mode are provided, onefor each

GX-900GX-900 TO SERVICE PERSONNEL1. Critical Components Information.Components having special characteristics are marked andmust be replaced with par

GX-900GX-900No. & DISPLAY01 G , E , TEST02 FL + CLEAR03 FL FULL04 APO - ON/OFF05 RDS - OFF/ON06 A , PS - ON/OFF07 A , M , - RDS/ALL08 CT > C -

GX-900GX-900Preset groupABCDEP1 P2 P3 P4 P5 P6 P7 P8CAUTION : When executing Test program No. 2 RAM CLEAR, be sure to write down the preset memory con

GX-900GX-900The CD TEST MODE is enabled. Each button operates as follows for each mode. The MODE No. is increased bypushing "+10" button.B

GX-900GX-900 ALL FUNCTION TEST MODEWhen ALL FUNCTION TEST MODE is set through SYSTEM TEST MODE, “AUX Digital” appears on the FL display.The operation

GX-900GX-900 CD STANDARD OPERATION CHARTPress OPEN/CLOSE key.Forced feed return operation.Clamp down operation.Disc table reset.Tray open.Tracking Of

GX-900GX-90024* ~ Data fetch cycle ~TRACK No. “1” is searched.~ PLAY ~Set to SEARCH by means of Y, T key.MUTE ON.TRACK search.After searching the beg

GX-900GX-900● CLOSE operation● HOME operationLOAD MOTOR reverse rotateStartLOAD SWOFF ?NOYESTIMER 10msLOAD SWON ?NOYESLOAD MOTOR STOPENDLOAD SWOFF ?NO

GX-900GX-90026● ROTARY TRAY initialization operationStartPOSITION SWOFF ?YESROTARY MOTOR forward rotate10sec timertime up ?YESROTARY MOTOR STOPERRORNO

GX-900GX-900 TAPE ADJUSTMENTS1. Before adjustment● Since head magnetization, dust accumulations, etc.are likely to introduce error in the various cha

GX-900GX-900“MECHANICAL ADJUSTMENT”Item to beAdjustedCheck eachtorqueCheck FF, REWtake up timeAzimuthTape SpeedWow/FlutterTapeCT-160L (FF, REW)TW-2111

GX-900GX-9002w A, B, G modelsEnglish➀ THIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION) INFORMS THE USER THAT THE APPARATUSCONTAINS A LASER COMPO

GX-900GX-900< Recording section >RatingAdjust for equal record andplayback levels.(– 27 dBV ± 0.3 dBV)Adjust for equal record andplayback levels

GX-900GX-900MD TEST MODE1. How to set to the test mode1) In the STANDBY mode, press the STANDBY/ON button while pressing the RANDOM button and the PLA

GX-900GX-900Description of TEST modes 1. AUTO pre-adjustment mode Automatic pre-adjustment is performed. (Grating adjustment mode after this adjustmen

GX-900GX-9002. AUTO adjustment modeStep Setting method Remark Display123456Set the TEST mode to STOP.Load a disc.Press the r(MD) button once.Press the

GX-900GX-9009. TEST-REC modeUse a disc for confirmation of recording function. (It is used to check the REC function at the specified address.)Step Se

GX-900GX-900● Forced rotation of loading motorIt is possible to force the loading motor to rotate by turning the jog dial when the microprocessor vers

Fig. 27MECHANISM ADJUSTMENTWhen making adjustment, be sure to connect an extension cable for servicing and an expansion P.C.B. as shown inFig.29.Oscil

1. Procedure to change the EE-PROM and write theinitial value of the microprocessor into EE-PROM(1) Replace the EE-PROM.(2) Refer to the latest “List

GX-900GX-900SLG ❍ ❍ 3B HSL2 ❍ ❍ 18 HSLDLIM ❍ ❍ 7F HSLDLEV ❍ ❍ 12 HSLKLVk ❍ ❍ 50 HSLKLVt ❍ ❍ 3A HSLKLVm ❍ ❍ 50 H● Slide settingItem on display Set valu

GX-900GX-90038Can't RECCan't CopyDIGin UnlockTOC FullUTOC ERR RUTOC ERR AUTOC ERR L0 ~ 4Not AudioDisc FullPlayback MDProtectedError on displ

GX-900GX-900 FRONT PANELS▼ B, G models▼ A model311A B C D E F G H I J K L M N OP Q R S T U V W X Y Z/22334455667788R. T IMECEDITD+I0EMODE REPEATRAND

GX-900GX-90039Can' t EditTMP Over!!DISC ERR RDISC ERR SDISC ERR WTOC ERR STOC ERR RU TOC W ERRFOCUS ERRBLANK DISCTOC W ERROREEPROM ERRORError on

GX-900GX-90040YESNONOWhen MD fails to operateWhen the objective lens of the optical pickup becomes dirty, MD may fail to operate. Clean the objective

GX-900GX-90041NO▼▼YESNO▼YES▼YESYES▼YES▼YES▲▲▲ Disc cannot be loaded properly.Does the loading function work properly when a disc is inserted?Does No.4

GX-900GX-90042▼NO▼YES▼YES▲▲▼▼Normal reproductionApplicable when the E2-PROM value has been confirmed as normal in the test modeIs initialization done

GX-900GX-90043YES▲▲YESNO▲▼YES▼YES▲Recording/reproduction functionLoad a low reflection disc and after confirming the audio output in the normal reprod

GX-900GX-90044NO▼YES▲▲▼YES▼YES▲Disc motor does not run.Is a correct waveform provided at No.24 and 25 pins of IC1201during the focus gain rough adjust

GX-900GX-90045 IC DATANo. Pin Name1 RF12 RF23 RF34 RF45 REFI6 REFO7 RFADD8 TCGI9 AIN10 BIN11 EIN12 FIN13 BIAS14 AVCC15* VSTBY16* XDISC17* XSGAIN18 AG

GX-900GX-90046No. Pin Name I/O1* EFMMON O2 AVCC3 EFMI I4 AGND5 AIN I6 EIN I7 TCG I8 BIN I9 FIN I10 VBAT I11 WBI I12 VDD113 DGND14,15 TEST0,TEST1 I16 T

GX-900GX-90047No. Pin Name I/O35 RAA7 O36 RAA8 O37 RAOEX O38 DGND39 RACASX O40 RAD2 I/O41 RAD3 I/O42 RAA9 O43 RARASX O44 RAWEX O45 RAD1 I/O46 RAD0 I/O

GX-900GX-90048No. Pin Name I/O1* NX O2 SBCK O3 LDVAR O4* ADIS O5 SFSY O6 LOADIN I7 ERROR I8 BYTE I9 CNVss I10 STID OUT O11 SEACH OUT O12 RESET I13* NC

GX-900GX-900▼ A model ▼ 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-

GX-900GX-90049No. Pin Name I/O55* P37/A15 O56* P36 O57* P35 O58 EEPRO O59 EPCS O60 EEPD I/O61 EEPK O62 Vcc I63* P30 O64 GND65 L3 DATA O66 L3 MODE O67

GX-900GX-90050No. Port I/O Name1 P96/ANEX1 I/O2 P95/ANEX0 I/O3 P94/DA1 I/O4 P93/DA0 I/O5 P92/TB2in I/O6 P91/TB1in O /MUTE7 P90/TB0in I/O8 BYTE I GND9

GX-900GX-90051No. Port I/O Name35 P63/TxD0 O KDATA36 P62/RxD0 I MDDATA37 P61/CLK0 O DSCK38 P60//CTS0,/RTS0 O MD-ST39 P57//RDY,CLKout O /MD-RES40 P56/A

GX-900GX-90058X159X279MSEL77CSEL20PMCK63FCLK19SMCK61BYTCK49VCOF52CK384(EFM)TIMINGGENERATORPITCH CONTROLVCOMICRO COMPUTERINTERFACEOUTPUTPORT29VREF26KIC

GX-900GX-900IC5 : MN662741RPB1 [P.C.B. CD]Signal Processor & Controller53Pin No.293031323334353637383940414243444546474849505152535455565758596061

GX-900GX-900IC11 : M38199EF [P.C.B. CD]8 bit µ-COM (CD CPU)54PortP77AN6P75P74P73P72P71P70PB3PB2P57P56P55P54P53P52P51P50P67P66P65P64P63P62P61P60P47Pin

GX-900GX-90055IC11 : M38199EF [P.C.B. CD]8 bit µ-COM (CD CPU)PortP46INT1INT4INT3INT2P41INT0/RESETXCINXCOUTXINXOUTVSSP27P26P25P24P23P22P21P20P17P16P15P

GX-900GX-900PortAN7AN6AN5AN4AN3AN2AN1AN0PB3DAAN15SCLK3SO3SI3AN11SCLK2SO2SI2P67SCLK1SO1SI1P63P62P61P60P47No.1234567891011121314151617181920212223242526

GX-900GX-900PortP46INT1INT4INT3INT2P41INT0/RESETXCINXCOUTXINXOUTVSSP27P26P25P24P23P22P21P20P17P16P15P14P13P12P11P10P07P06P05P04P03P02P01P00P37P36P35P3

GX-900GX-900PortP83P82P81P80PA7PA6VCCPA5PA4PA3PA2PA1PA0VEEAVSSVREFNo.858687888990919293949596979899100FunctionHEAD PHONE DETECT [L : HP DETECT]MIC DET

GX-900GX-900 SPECIFICATIONS AMPLIFIER SECTIONMinimum RMS Output Power per Channel1kHz, 0.9% THD, 6Ω ...80W + 80W1

GX-900GX-90059● V801 : 16-BT-63GK (V2959000)Note 1) F1, F2 ... Filament2) NP ... No Pin3) NC ... No Connection4) P1~P35...

ABCDEFGH123456GX-900PK1AMCOIL PACKIF AMPQ1CERAMICFILTERL1CERAMICFILTERL28127L.P.FL.P.FTUNER.RTUNER.LTUNERAM/FM IFMPXIC1LA1838PLLIC2LC72131MPK2AM STERE

ABCDEFGH123456GX-900CD CPUIC11HEADAMPIC1AN8806SBACTMOTORDRIVEMOTORDRIVEIC3MOTORDRIVEIC4SOLDRIVEQ3,4DOLBYR/P AMPIC6MOTORDRIVEQ2,11TRACKINGFOCUSFCSUNLOA

ABCDEFGH123456GX-900 BLOCK DIAGRAM64 65VOLUME LEVELCONTROLGEQIC7INPUTSWITCHIC3MUTEQ23.24SPEANAIC26MUTEQ21PROTECTIONU801FL DISPLAYV801KEY CONTSW801-80

ABCDEFGH123456GX-90066 67 MD TEST POINT WAVEFORM1997 / 08 / 04 09:30:15TTP1201(EFMMON)NORM: 100M S/sCH1 500mVAC 10:1500ns/divT1Record LenSMOOTH

ABCDEFGH123456GX-90068 69112510131520242530353637404548GDSGDS21DGS11 15 16 20156102630 35 40 45505155606570757680859095100151015202551 556065 70 75808

ABCDEFGH123456GX-900 PRINTED CIRCUIT BOARD (Foil side)70 71CIRCUIT CHANGES BY MARKET.U, C, R, T, L, A B, G JX3 X X OX4 X O XIC3 X X OIC4 X O XQ4 X X

ABCDEFGH123456GX-900 PRINTED CIRCUIT BOARD (Foil side)72 73Point q (Pin59 of IC5)V : 5V/div H : 50 nsec/divDC range 1 : 1 probePoint w (Pin39 of IC11

ABCDEFGH123456GX-900 PRINTED CIRCUIT BOARD (Foil side)74 7512VLRU5.6VCDCESYSOVSELAGND-12VEDGNDSYSICDRESSYSCKAGNDSYSCTLSYSCKSYSOSYSIMFRESPDNDGNDSTEINS

ABCDEFGH123456GX-900 PRINTED CIRCUIT BOARD (Foil side)76 77Point e (Pin37 of IC8)V : 2V/div H : 20 µsec/divDC range 1 : 1 probePoint r (Pin39 of IC8)

GX-900GX-9006 INTERNAL VIEWLeft sideTop sideq P.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

ABCDEFGH123456GX-900 PRINTED CIRCUIT BOARD (Foil side)78 79DGNDKEY0P.C.B. OPERATION(2) (Lead Type Device)REMVREFKEY0VOLBINTIMER/FLRESFLCLKFLGNDFL1DGN

ABCDEFGH123456GX-90080 81 PRINTED CIRCUIT BOARD (Foil side)-27V-12V-HB-LBTRACECDAC2CDAC1FAC2FAC1CDGNDCDGNDCDBMDGNDMDGNDMDB-LBKGND+12MLB-27V-12V12VFAC

ABCDEFGH123456GX-90082 83 PRINTED CIRCUIT BOARD (Foil side) PIN CONNECTION DIAGRAM● ICs5150318180100301M38199EFFPM30624FGMN662741RPB1414021606180201

ABCDEFGH123456IJK78GX-900 SCHEMATIC DIAGRAM (MD MAIN)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special char

ABCDEFGH123456IJKL78GX-900 SCHEMATIC DIAGRAM (MD)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special characte

ABCDEFGH123456IJKLMN78910GX-900 SCHEMATIC DIAGRAM (CD)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special cha

ABCDEFGH123456IJKLMNO78910GX-90087 SCHEMATIC DIAGRAM (INPUT)The voltages are measured by Type II/High tape at PLAY mode (no-signal condition)Only the

ABCDEFGH123456IJK78GX-900 SCHEMATIC DIAGRAM (OPERATION)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special ch

ABCDEFGH123456IJKL78GX-900 SCHEMATIC DIAGRAM (MAIN)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special charac

ABCDEFGH123456IJK78GX-900 SCHEMATIC DIAGRAM (TUNER)* All voltage are measured with a 10MΩ/V DC electric volt meter.* Components having special charac

GX-900GX-900 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.)Fig. 2Fig. 171. Removal of Top CoverRemove 11 screws ( q ) in Fig. 1.2. R

GX-900GX-900ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS :C.A.EL.CHP : CHIP ALUMI. ELECTROLYTIC CAPC.CE : CERAMIC CAPC.CE.ARRAY : CERAMIC CAP ARRAYC.CE.C

GX-900GX-90092P.C.B. CDSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts** V4004200 P.C.B. CDCB1 V2731000 CN.FMN 16PCB2 VU

GX-900GX-90093P.C.B. CD & MDSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*L2 VU889500 COIL 220uHQ1 VR402300 TR 2SB

GX-900GX-90094P.C.B. INPUTSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts** V4003000 P.C.B. INPUT(A)* V4004100 P.C.B. IN

GX-900GX-90095P.C.B. INPUTSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*C105 UB052100 C.CE.M.CHP 100pF 50VC106 UB05210

GX-900GX-90096P.C.B. INPUT & MAINSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*Q5 VV655300 TR.DGT DTA144EKAQ6 VV65

GX-900GX-90097P.C.B. MAIN & OPERATIONSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*C243 V3671000 C.EL 4700uF 35VC2

GX-900GX-90098P.C.B. OPERATION & TUNERSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*C863 UB012270 C.CE.M.CHP 270pF

GX-900GX-90099P.C.B. TUNERSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*C16 UB044470 C.CE.M.CHP 0.047uF 50VC17 UR86610

GX-900GX-900100P.C.B. MD MAINSchmRef. PART NO. Description RemarksSchmRef. PART NO. Description Remarks*New Parts*New Parts* AAX02260 P.C.B. MAIN 92LP

GX-900GX-900Fig. 384. Removal of Deck Mechanical Unita. Remove 4 screws ( t ) and then remove the DeckMechanical Unit in Fig. 3.b. Remove 3 connectors

GX-900GX-900101P.C.B. MD MAINSchmRef. PART NO. Description Remarks*New PartsSchmRef. PART NO. Description Remarks*New Parts* D1300 AAX02470 DIODE SB02

GX-900GX-900102P.C.B. MD MAIN & OTHERSchmRef. PART NO. Description Remarks*New PartsSchmRef. PART NO. Description Remarks*New Parts* R1423 AAX0176

103 104GX-900CHIP RESISTORSchmRef. PART NO. DescriptionNew Parts*SchmRef. PART NO. DescriptionNew Parts*RD250000 R.CAR.CHP 0Ω 1/10WRD253100 R.CAR.CHP

EXPLODED VIEW105 106ABCDEFGH123456GX-900102126181150150150125157157150150150190190150180182107200186151141155615515735891211201501541510315115115115

MECHANICAL PARTS107 108GX-900Ref.No. PART NO. Description Remarks MarketsNew Parts** 1- 3 V4003300 P.C.B. ASS’Y OPERATION* 1- 7 V3728300 BAN-CARD 25

109 110 EXPLODED VIEW (CD Mechanism Unit)ABCDE1234567GX-900 MECHANICAL PARTS (CD Mechanism Unit)Ref.No. PART NO. Description Remarks MarketsNew Part

111 112ABCDE1234567 EXPLODED VIEW (Traverse Unit)Ref.No. PART NO. Description Remarks MarketsNX635360 TRAVERSE UNIT KSM-213BCM 904380021 NX635420 MOT

113 114 EXPLODED VIEW (Loading Unit) EXPLODED VIEW (Cassette Deck Mech. Unit)Ref.No. PART NO. Description Remarks MarketsNew Parts*AAX07660 LOADING

115 116ABCDE1234567 EXPLODED VIEW (MD Recorder Unit) MECHANICAL PARTS (MD Recorder Unit)Ref.No. PART NO. Description Remarks MarketsNew Parts** V30

117 118Ref.No. PART NO. Description Remarks MarketsNew Parts** 609 AAX01620 WASHER 1.2x3x0.2 LXWZ9269AFZZ* 610 AAX02990 SCREW M1.7x2.1 LXBZ0036AWZZ* 6