hit counter script
Yamaha GX-900 Service Manual
  1. Manuals
  2. Brands
  3. Yamaha Manuals
  4. Stereo System
  5. GX-900
  6. Service manual
Yamaha GX-900 Service Manual

Yamaha GX-900 Service Manual

Mini component system
Hide thumbs Also See for GX-900:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
CONTENTS
TO SERVICE PERSONNEL ..................................... 1~2
FRONT PANELS ........................................................... 3
REAR PANELS ............................................................. 4
SPECIFICATIONS ......................................................... 5
INTERNAL VIEW .......................................................... 6
DISASSEMBLY PROCEDURES ............................ 7~16
VOLUME RANGE ....................................................... 17
SYSTEM CONTROL CHECK ..................................... 17
TEST MODE ................................................................ 18
SYSTEM TEST MODE ................................................ 18
RECEIVER TEST MODE ...................................... 19~20
TAPE TEST MODE ..................................................... 20
CD TEST MODE ......................................................... 21
ALL FUNCTION TEST MODE .................................... 22
CD ERROR MESSAGES ............................................ 22
CD STANDARD OPERATION CHART ................ 23~26
1 0 0 6 7 4

MINI COMPONENT SYSTEM

GX-900
This 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 expensive components, and failure of the product to perform as specified.
For these reasons, we advise all YAMAHA product owners that any service required 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, certifica-
tion or recognition of any applicable technical 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 are continually striving to improve YAMAHA products. Modifications are, therefore,
inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to
exist, please contact the distributor's Service Division.
WARNING:
Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground 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.
SERVICE MANUAL
GX-900 is composed of GX-900 and NX-GX500.
IMPORTANT NOTICE
TAPE ADJUSTMENTS ......................................... 27~29
MD TEST MODE & ADJUSTMENTS ................... 30~37
MD ERROR DISPLAY .......................................... 38~39
MD TROUBLESHOOTING .................................... 40~44
IC DATA ................................................................ 45~58
DISPLAY DATA .......................................................... 59
BLOCK DIAGRAM ................................................ 60~65
MD TEST POINT WAVEFORM ............................ 66~67
PRINTED CIRCUIT BOARD ................................. 68~82
PIN CONNECTION DIAGRAM ................................... 83
SCHEMATIC DIAGRAM ....................................... 84~90
PARTS LIST ........................................................ 91~117
GREASE APPLICATION DIAGRAM ................ 118~120
REMOTE CONTROL TRANSMITTER ...................... 121
NX-GX500 .................................................................. 122
GX-900

Advertisement

Table of Contents
loading

Related Manuals for Yamaha GX-900

Summary of Contents for Yamaha GX-900

  • Page 1: Table Of Contents

    This 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.

  • Page 2: To Service Personnel

    GX-900 TO SERVICE PERSONNEL 1. Critical Components Information. AC LEAKAGE Components having special characteristics are marked and EQUIPMENT WALL TESTER OR must be replaced with parts having specifications equal to OUTLET UNDER TEST EQUIVALENT those originally installed. INSULATING TABLE CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
  • Page 3 GX-900 A, B, G models English THIS PRINTING (SEE POSITION SHOWN IN THE ILLUSTRATION) INFORMS THE USER THAT THE APPARATUS CONTAINS A LASER COMPONENT. THIS LABEL (SEE POSITION SHOWN IN THE ILLUSTRATION) WARNS THAT ANY FURTHER PROCEDURE WILL BRING THE USER INTO EXPOSURE WITH THE LASER BEAM.

  • Page 4: Front Panels

    GX-900 FRONT PANELS B, G models A model A B C D E F G H I J K L M N O PRESET P Q R S T U V W X NX-GX500 TIME PROG R. TIME EDIT SPACE...

  • Page 5: Rear Panels

    GX-900 REAR PANELS A model B, G models 280(11")

  • Page 6: Specifications

    (approx. 1W when set to the standby mode) Type .......... 3-Disc Carousel Auto-changer Dimensions (W X H X D) Signal Readout ............Non-contact, GX-900 ..........280 X 320 X 364mm 3-beam semi-conductor laser pick-up (11” X 12-5/8” X 14-5/16”) D/A Converter ............. 1bit DAC NX-GX500 ........

  • Page 7: Internal View

    GX-900 INTERNAL VIEW Top side q P.C.B. TUNER w P.C.B. MAIN (5) e P.C.B. MAIN (1) r P.C.B. INPUT (1) t MD MECHANICAL UNIT y P.C.B. MAIN (2) u P.C.B. MAIN (3) i P.C.B. MAIN (6) o DECK MECHANICAL UNIT Left side !0 P.C.B.

  • Page 8: Disassembly Procedures

    GX-900 DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) 1. Removal of Top Cover Top Cover Remove 11 screws ( q ) in Fig. 1. 2. Removal of CD Mechanical Unit a. Disconnect the power cord from the AC outlet.
  • Page 9 GX-900 4. Removal of Deck Mechanical Unit a. Remove 4 screws ( t ) and then remove the Deck Mechanical Unit in Fig. 3. b. Remove 3 connectors ( W2, W3 and W4 ) in Fig. 3. Deck Mechanical Unit MD Mechanical Unit Fig.
  • Page 10 GX-900 7. Operation Check of P.C.B. CD a. 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.
  • Page 11 GX-900 8. 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. Remove 5 screws ( ! 2 ) in Fig. 7.
  • Page 12 GX-900 9. Removal of Tray & Traverse Unit a. Remove 4 screws ( ! 6 ) and then remove the Clamp Bracket in Fig. 11. b. Remove 2 screws ( ! 7 ) and then remove the Tray Brackets in Fig. 11.
  • Page 13 GX-900 10. Removal of Pick-up Head 11. Removal of Cassette Mechanism a. Remove the Gear A in Fig. 13. Remove 4 screws ( !9 ) and then pull out the Cassette b. Pull out the Sled Shaft and remove the Pick-up Head Mechanism in Fig.
  • Page 14 GX-900 Disassembly of MD Mechanism Unit Remove the MD mechanical unit according to Steps 1 ~ 6 of the disassembly procedure (page 7). Removal of MD Main P.C.B. (Fig. 16) 1. Remove 4 screws (Q1). 2. Remove 6 connectors (Q2).
  • Page 15 GX-900 Removal 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 +5V voltage (*2) applied to the red line side of the blue connector of the loading motor, push the rack gear in the arrow direction until the cam plate lever clicks.
  • Page 16 GX-900 (E1)x1 Removal of Mechanism SW P.C.B. (Fig.20) Ø1.7x3mm • Once the mechanism switch P.C.B. is removed, it will (E1)x1 be necessary to perform “Adjustment of Lead-in Switch Ø1.7x9.5mm Position”. (See page 34.) Mechanism SW P.C.B. 1. Remove 2 screws (E1) and then remove the Mecha- nism SW P.C.B.
  • Page 17 GX-900 Removal of Spindle Motor (Fig.22) • Once the spindle motor is removed, it will be neces- sary to perform “Pickup Rating”. (See page 35.) 1. Remove 3 screws (C1). 2. Remove the spindle motor by moving it in the arrow direction.

  • Page 18: Volume Range

    GX-900 VOLUME RANGE DISPLAY DISPLAY DISPLAY – ∞ VOL MIN VOL 10 –55 VOL 56 –9 VOL 01 –79 VOL 57 –8 VOL 11 –54 VOL 02 –73 VOL 58 –7 VOL 03 –68 VOL 59 –6 VOL 04 –64 VOL 60 –5...

  • Page 19: Test Mode

    GX-900 TEST MODE To facilitate inspection, measurement and location of any faulty point, 6 types of built-in Test Mode are provided, one for each section. • System Test Mode : Test mode for the system section. It is also used when entering the test mode for each section.

  • Page 20: Receiver Test Mode

    GX-900 RECEIVER TEST MODE When RECEIVER TEST MODE is set through SYSTEM TEST MODE, “01 G.E.TEST” appears on the FL display. (01 is the test program No.) Test programs from 01 to 25 are incorporated in RECEIVER TEST MODE. Operation Procedure (Selection/execution of Test Program) 1) Select the test program by pressing the rTAPE (up) or eTAPE (down) button.

  • Page 21: Tape Test Mode

    GX-900 Equalizer test mode (Test program No. 01) When the equalizer test mode is set, “GEQ - xxx” is displayed. “xxx” represents the 3 band value of GEQ. It is possible to set the GEQ value directly, using the buttons on the remote control unit.

  • Page 22: Cd Test Mode

    GX-900 CD TEST MODE When CD TEST MODE is set through SYSTEM TEST MODE, “00STM100: 00” appears on the FL display. The CD TEST MODE is enabled. Each button operates as follows for each mode. The MODE No. is increased by pushing button.

  • Page 23: All Function Test Mode

    GX-900 ALL FUNCTION TEST MODE When ALL FUNCTION TEST MODE is set through SYSTEM TEST MODE, “AUX Digital” appears on the FL display. The operation condition in this mode will be as follows. • AUX is used as the input source of the receiver section.

  • Page 24: Cd Standard Operation Chart

    GX-900 CD STANDARD OPERATION CHART Press OPEN/CLOSE key. “OPEN” appears in the TIME indicator. Forced feed return operation. “TRV” signal is output until detection of LIMIT switch. Clamp down operation. Disc table reset. Tray open. Tracking Offset auto ADJ. (only POWER ON) Focus Offset auto ADJ.
  • Page 25 GX-900 * TOC READ * ~ Data fetch cycle ~ TRACK No. “1” is searched. : MUTE = “L” → “H”, After searching the beginning, MUTE is cancelled. “0:00” appears in the time indicator (IC11, 64 pin) ~ PLAY ~ Set to SEARCH by means of Y, T key.
  • Page 26 GX-900 HOME operation CLOSE operation Start Start LOAD MOTOR reverse rotate 10sec timer start LOAD SW LOAD MOTOR forward rotate OFF ? LOAD SW TIMER 10ms ON ? LOAD SW 10sec timer TIMER 10ms OFF ? time up ? LOAD MOTOR STOP...
  • Page 27 GX-900 ROTARY TRAY initialization operation Start 10sec timer start ROTARY MOTOR forward rotate 10sec timer time up ? POSITION SW OFF ? ROTARY MOTOR STOP Timer 20ms ERROR POSITION SW OFF ? 10sec timer time up ? POSITION SW ON ?

  • Page 28: Tape Adjustments

    GX-900 TAPE ADJUSTMENTS 1. Before adjustment 3. Test tape required Since head magnetization, dust accumulations, etc. MTT-111N (TX911650) ......Normal speed are likely to introduce error in the various character- MTT-114N (TX911680) ........ Azimuth istics, it is very important that the heads are properly MTT-212N (TX911660) ......
  • Page 29 GX-900 “MECHANICAL ADJUSTMENT” Item to be Instrument Adjustment Step Tape Mode Rating Remarks Adjusted required part Check each CT-160L (FF, REW) Torque FF REW FF, REW torque : within 70 ~ 160g/cm. torque meter TW-2111A (FWD) PLAY Take up torque : 30 ~ 70g/cm.
  • Page 30 GX-900 < Recording section > Item to be Instrument Measurement Points of Adjustment Step Tape Mode Rating Adjusted required conditions measurement parts Recording AC-514 VR6 (L ch) ACVM Input 1 kHz Signal to REC OUT Adjust for equal record and...

  • Page 31: Md Test Mode & Adjustments

    GX-900 MD TEST MODE & ADJUSTMENT Extension cable (see connection diagram on page 35.) Preparation before Adjustment Test disc Type Part No. Type Test disc 1. Extension P.C.B. for servicing TX946230 2. 2-pin extension connector for servicing TX946200 High reflecting disc TDYS1 (SONY) [for reproduction] (P/No.
  • Page 32 GX-900 Description of TEST modes 1. AUTO pre-adjustment mode Automatic pre-adjustment is performed. (Grating adjustment mode after this adjustment.) [ _ AUT _ YOBI _ ] Adjusted values are output by using the interface. 2. AUTO adjustment mode Automatic adjustment is performed.
  • Page 33 GX-900 2. AUTO adjustment mode Step Setting method Remark Display Set the TEST mode to STOP. No disc is loaded. [ EJECT ] [ LOADING ] Load a disc. AUTO pre-adjustment menu Press the r(MD) button once. AUTO adjustment menu...
  • Page 34 GX-900 9. TEST-REC mode Use a disc for confirmation of recording function. (It is used to check the REC function at the specified address.) Step Setting method Remark Display [ _ AUT _ YOBI _ ] Load a disc. AUTO pre-adjustment menu Press the MD EDIT button twice.
  • Page 35 GX-900 Lead-in switch position measurement mode Load a TDYS1 disc for reproduction (high reflecting disc). Note) Adjust the position of the lead-in switch to FF85 ~ FFD2. 1. Loosen 2 screws (A) fixing the mechanism switch P.C.B. 2. Retighten screws while pushing the mechanism switch P.C.B. in the arrow (<-) direction and then measure the position of the lead-in switch again.
  • Page 36 MECHANISM ADJUSTMENT When making adjustment, be sure to connect an extension cable for servicing and an expansion P.C.B. as shown in Fig.29. 1. Optical pickup rating inspection method (Externally attached) Oscilloscope GND (TP1125) IC1101 No.43 pin 100K EOUT (TP1129) IC1101 No.26 pin 470p GND CH1 CH2 Spindle motor...
  • Page 37 PROCEDURE TO WRITE DATA INTO EE-PROM (IC1402) 1. Procedure to change the EE-PROM and write the (5) Press the MD r button 4 times. Temp initial value of the microprocessor into EE-PROM (1) Replace the EE-PROM. (6) Press the REC/PAUSE(MD) button. [ TEMP (2) Refer to the latest “List of EE-PROM contents”.
  • Page 38 GX-900 Slide setting Control setting Item on display Set value Item on display Set value CONTROL1 CONTROL2 SLDLIM SPKLEVm SLDLEV ADJTTM SLKLVk HDEQAD SLKLVt LDEQAD SLKLVm GDEQAD HDEQBC LDEQBC Adjust setting GDEQBC Item on display Set value HALSG LALSG GALSG...

  • Page 39: Md Error Display

    GX-900 MD ERROR DISPLAY Error on display Description Countermeasure Can't REC • Check that the disc is free from scratch, dust, • DEFECT occurred 10 times continuously during REC- PLAY. finger print, black spot, etc. and that • Recordable cluster became “0” due to occurrence of decentering, face deflection, etc.
  • Page 40 GX-900 Error on display Description Countermeasure Can' t Edit • Editing conditions were not satisfied with respect to • Wrong operation procedure was used. Try each editing function. again by using the correct procedure. • Check according to troubleshooting. TMP Over!! •...

  • Page 41: Md Troubleshooting

    GX-900 MD TROUBLESHOOTING When MD fails to operate When the objective lens of the optical pickup becomes dirty, MD may fail to operate. Clean the objective lens first and check MD for reproduction function. If it still fails to operate, check according to the following flow charts.
  • Page 42 GX-900 Disc cannot be loaded properly. Does the loading function work properly when a disc is inserted? Does No.4 pin of CN1901 become “L”? Check CN1901 and SW1956. Does a change occur at either No.1 or 28 pin of IC1601? Check IC1401.
  • Page 43 GX-900 Normal reproduction Applicable when the E2-PROM value has been confirmed as normal in the test mode Is initialization done properly for reproduction of a high reflecting disc? Does the play time display count up properly? Check IC1201. Is the disc turning properly?
  • Page 44 GX-900 Recording/reproduction function Load a low reflection disc and after confirming the audio output in the normal reproduction mode, execute recording/reproduction. Does the recording function fail from the starting address? Check that the disc is not in the recording inhibited status.
  • Page 45 GX-900 Disc motor does not run. Check No.24 and 25 pins of IC1201 as well as soldering Is a correct waveform provided at No.24 and 25 pins of IC1201 and parts of the peripheral circuit. during the focus gain rough adjustment step in the test mode? Is a waveform provided at No.11 and 12 pins of IC1601 as...

  • Page 46: Ic Data

    GX-900 IC DATA IC1101 : IR3R55 [P.C.B. MD MAIN] RF Signal Processing ADIPI ADIPO DIFF DIFF ADLPFO ADIP REFI 22KO REFO 22KI BIAS RFADD TCGI TCGO AOUT BOUT EOUT LOGIC FOUT Pin Name Function RF signal input terminal 1 to input RF signal output from pickup...
  • Page 47 GX-900 IC1201 : LR376484 [P.C.B. MD MAIN] ATRAC Encoder/Decoder 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 EFMO TOTMON PLCK TEMON ACRCER SBCK...
  • Page 48 GX-900 IC1201 : LR376484 [P.C.B. MD MAIN] ATRAC Encoder/Decoder Pin Name Function RAA7 Address output to external D-RAM. ADR7 Address output to external D-RAM. ADR8 RAA8 Data output enable signal output to external D-RAM RAOEX Ground terminal for digital section...
  • Page 49 GX-900 IC1401 : iX0290AW [P.C.B. MD MAIN] MD System Microprocessor Pin Name Function Input/output port P96 SBCK Input/output port P95 LDVAR (Laser power adjustment output) LDVAR ADJS (for automatic adjustment step check) ADIS SFSY Input/output port P92 LD SW CK input (interrupt input only when used individually)
  • Page 50 GX-900 IC1401 : iX0290AW [P.C.B. MD MAIN] MD System Microprocessor Pin Name Function P37/A15 Input/output port P37 Input/output port P36 Input/output port P35 EEPRO EEPRO (E2PROM protect cancel) EPCS EPCS (E2PROM chip selector output) EEPD EEPD (E2PROM serial data output)
  • Page 51 GX-900 IC2 : M30622M8-xxxFP [P.C.B. MD] Main System Microprocessor (MD CPU) /CS0 /CS1 /CS2 /CS3 /WRL/WR /WRH/BHE /BCLK /HLDA /HOLD /ALE /RDY/CLK /CTS /RTS /CLK /RXD /TXD /CTS /RTS /CTS /CLKS /CLK /RXD /TXD Port Name Function Unused (GND) P96/ANEX1...
  • Page 52 GX-900 IC2 : M30622M8-xxxFP [P.C.B. MD] Main System Microprocessor (MD CPU) Port Name Function P63/TxD0 KDATA MD key data P62/RxD0 MDDATA MD data input P61/CLK0 DSCK MD clock output P60//CTS0,/RTS0 MD-ST MD start (MD-ON) P57//RDY,CLKout /MD-RES MD reset output P56/ALE...
  • Page 53 GX-900 IC5 : MN662741RPB1 [P.C.B. CD] Signal Processor & Controller 58 59 79 77 20 63 19 61 49 52 8 7 9 78 76 44 46 45 47 48 52 53 50 51 15 14 80 69 68 55 56 62 13 67 66...
  • Page 54 GX-900 IC5 : MN662741RPB1 [P.C.B. CD] Signal Processor & Controller Pin No. Name Function Reference voltage for D/A output section (TVD, ECS, TRD, FOD, FBAL, TBAL, TOFS) VREF FBAL Focus balance adjustment output TBAL Tracking balance adjustment output Focus error signal input...
  • Page 55 GX-900 IC11 : M38199EF [P.C.B. CD] µ 8 bit -COM (CD CPU) P87/SEG15 P16/DIG14 P86/SEG14 P17/DIG15 P85/SEG13 P20/DIG16 P84/SEG12 P21/DIG17 P83/SEG11 P22/DIG18 P82/SEG10 P23/DIG19 P81/SEG9 P80/SEG8 PA7/SEG7 PA6/SEG6 PA5/SEG5 X OUT PA4/SEG4 X IN PA3/SEG3 PB0/XC OUT PA2/SEG2 PB1/XC IN...
  • Page 56 GX-900 IC11 : M38199EF [P.C.B. CD] µ 8 bit -COM (CD CPU) Pin No. Port Name Function Open INT1 BLKCK Q-code read OK signal INT4 Open INT3 Open Decoder interrupt signal (Unused) INT2 /HINT DEPH De-emphasis control (Unused) System µ-COM data automatic transfer initialize, start signal...
  • Page 57 GX-900 IC11 : M38199EF [P.C.B. CD] µ 8 bit -COM (CD CPU) Pin No. Port Name Function Not used Not used Not used Not used Not used Not used Not used Not used Not used Not used Not used Not used...
  • Page 58 GX-900 IC8 : M38199EF [P.C.B. INPUT] µ 8 bit -COM (SYSTEM CPU) Port Name Function MDRES MD RESET INT1 ACIN POWER DOWN AC PULSE IN INT4 MD POWER DOWN INT3 OPEN INT2 REMO REMOTE CONTROL SIGNAL IN STEIN TUNER STEREO/MONO DETECT...
  • Page 59 GX-900 IC8 : M38199EF [P.C.B. INPUT] µ 8 bit -COM (SYSTEM CPU) Port Name Function HEAD PHONE DETECT [L : HP DETECT] MIC DETECT CASS CASSETTE IN DETECT PLSW DECK MECHA PLAY POSITION DETECT CrO2 (70 µs) POSITION DETECT CRO2...

  • Page 60: Display Data

    GX-900 DISPLAY DATA V801 : 16-BT-63GK (V2959000) PATTERN AREA PIN CONNECTION Pin No. Connection F1 NP NP P35 P34 P33 P32 P31 P30 P29 P28 P27 P26 P25 P24 P23 P22 P21 P20 P19 P18 P17 P16 P15 P14 P13 P12 P11 P10 Pin No.
  • Page 61 GX-900 BLOCK DIAGRAM...

  • Page 62: Block Diagram

    GX-900 BLOCK DIAGRAM CD DIGITAL OUT DECK CASSETTE MECHA TRAVERSE UNIT IC10 MUTE TAPE REC Q9,10 R/P HEAD REC LEVEL HEAD Q35,36 IC8 76 TPEQ VR5,6 SERVO SIGNAL DOLBY PROCESSOR R/P AMP AN8806SB DF.DAC PB LEVEL VR1,4 TAPE PB SWITCH...
  • Page 63 GX-900 BLOCK DIAGRAM IC11 MUTE SMUTE IC8 59 5.0V HP,IC8 85 MUTE HP JACK Q801 INPUT IC21 JK803 TUNER SWITCH INPUT SWITCH POWER AMP TAPE HP AMP IC201 TE201 9,10 Q31,32 IC10 RY201 MUTE IN2A,IN2B MUTE Q201 IC8 64,65 Q23.24...

  • Page 64: Md Test Point Waveform

    GX-900 MD TEST POINT WAVEFORM Stopped PLAY PIT PLAY PLAY Stopped NORM: 1k S/s 1997 / 08 / 04 14:19:52 Stopped Stopped NORM: 1M S/s NORM: 100M S/s 1997 / 08 / 04 13:35:24 1997 / 08 / 04 11:23:12...
  • Page 65 GX-900 PRINTED CIRCUIT BOARD (Foil side) Note : y ~ o : TEST POINT WAVEFORMS (See page 66 ~ 67) Connect an oscilloscope to the test points (y ~ o) through a filter as shown below. 100K test points oscilloscope...
  • Page 66 GX-900 PRINTED CIRCUIT BOARD (Foil side) P. C. B. MD (Lead Type Device) P.C.B. TUNER P.C.B. TUNER (Lead Type Device) (Surface Mount Device) FROM : MAIN (1) P. C. B. MD (Surface Mount Device) TUMUTE TUCE TUDATA TUCLK TUDO STAD...
  • Page 67 GX-900 PRINTED CIRCUIT BOARD (Foil side) P.C.B. CD (Lead Type Device) P.C.B. CD (Surface Mount Device) FROM: MOTOR UNIT FROM: PICK UP HEAD (LOADING) LIMITSW LIMITSW FEED- FEED+ SPD- SPD+ ROTARY+ ROTARY- ADRESS SW ADRESS SW STOP SW STOP SW...
  • Page 68 GX-900 PRINTED CIRCUIT BOARD (Foil side) P.C.B. INPUT (1) (Lead Type Device) P. C. B. INPUT ( 2 ) (Lead Type Device) TO : MD FROM : CD FROM : TUNER HP.GND FROM : OPERATION(3) FROM : INPUT (1) HP.R HPIN HP.L...
  • Page 69 GX-900 PRINTED CIRCUIT BOARD (Foil side) P.C.B. INPUT (1) (Surface Mount Device) P. C. B. INPUT ( 2 ) (Surface Mount Device) Point t V : 2V/div (CH1) CH1 : Collector of Q19 V : 2V/div (CH2) CH2 : Anode of D11 H : 0.5 sec/div...

  • Page 70: Printed Circuit Board

    GX-900 PRINTED CIRCUIT BOARD (Foil side) FROM: INPUT(1) P.C.B. OPERATION(1) (Lead Type Device) P.C.B. OPERATION(2) (Lead Type Device) OPEN/ DISC DISC3 DISC2 DISC1 CLOSE CHANGE DGND KEY0 DGND KEY0 W803 TO: OPERATION(2) P.C.B. OPERATION(1) (Surface Mount Device) VOLUME W803 TO: OPERATION(1) P.C.B.
  • Page 71 GX-900 PRINTED CIRCUIT BOARD (Foil side) P.C.B. OPERATION(3) (Lead Type Device) P.C.B. MAIN(1) FROM: INPUT(1) FROM: INPUT(1) FROM: MAIN(3) INPUT YMERSION MUSIC B. BOOST MD REC/ TIME REPEAT RANDOM PAUSE SET CHARACTER PHONES J923 TREBLE BASS DISPLAY MEMORY AUTO/ TAPE REC/...

  • Page 72: Pin Connection Diagram

    GX-900 PIN CONNECTION DIAGRAM PRINTED CIRCUIT BOARD (Foil side) µPC4570HA P.C.B. MAIN(2) P.C.B. MAIN(6) NJM78L05A M5237L BA15218N TA8409S LB1641 STK496-420Y µPC1330HA FROM: POWER CORD 1:INPUT 1:OUTPUT 2:COMMON 2:COMMON 3:OUTPUT 3:INPUT µPD4066BG µPC4570G2 TC4052BF LC72131M LC72720NM BA3835S TC74HC125AF TA2040AF TC74HC04AF TC74VHC153F...

  • Page 73: Schematic Diagram

    GX-900 IC1202 : IX2474AF SCHEMATIC DIAGRAM (MD MAIN) : TEST POINT WAVEFORMS (See page 66 ~ 67) 4M Bit D-RAM MD MAIN PWB-A Write Clock Clock Generator Note : y ~ o Generator TP1215 TP1218 Connect an oscilloscope to the test points (y ~ o) through a...
  • Page 74 GX-900 SCHEMATIC DIAGRAM (MD) 10.1 BUFFER -9.8 -9.8 MUTING 10.1 MD CPU -9.8 -9.8 -9.8 12.4 REGULATOR 10.9 10.3 BACKUP µ Point i (Pin13 of IC2) IC3, 5 : PC4570G2 IC4 : TC74HCT04AF-T1 Dual OP-Amp Hex Inverters V : 2V/div...
  • Page 75 GX-900 SCHEMATIC DIAGRAM (CD) CD HEAD AMP IC1 : LA6541D 4 Channel BTL Driver REGULATOR REGULATOR – MAIN(1) MUTE VREF 11.1 11KΩ 11KΩ LEVEL SHIFT LEVEL SHIFT VIN1 VIN4 BTL AMP BTL AMP – INPUT(1) BTL AMP BTL AMP LEVEL SHIFT...
  • Page 76 GX-900 The voltages are measured by Type II/High tape at PLAY mode (no-signal condition) SCHEMATIC DIAGRAM (INPUT) IC6 : CXA1897Q Only the voitages ( ) are at REC (CD) mode. Dolby B-Type Noise Reduction System with Recording/Playback Equalizer DOLBY NR OFF...
  • Page 77 GX-900 SCHEMATIC DIAGRAM (OPERATION) MUTING -6.0 µ IC810 : PC4570HA Dual OP-Amp -6.0 12.4 – – DRIVER –Vm –Vm -24.8 -24.8 -24.8 IC814 : YSS247-D YMERSION 12.1 -11.8 AVDD FILTER SWITCH -26.8 BUFFER -21.4 VREF VREF SWITCH –1 SWITCH YMERSION...
  • Page 78 GX-900 SCHEMATIC DIAGRAM (MAIN) REGULATOR -12.7 -27.3 -12.7 -26.8 -51.2 -12.1 -23.8 REGULATOR P86 L-2 51.0 12.5 23.3 12.4 23.3 P85 H-6 12.9 13.0 -51.2 12.9 13.0 P87 K-6 IC201 : STK496-420Y 2 Channel AF Power Amp POWER TR31 PROTECTION...
  • Page 79 GX-900 Each voltage represents the voltage when receiving FM (stereo) signal and the voltage in the parentheses ( ) is the voltage when receiving AM signal. SCHEMATIC DIAGRAM (TUNER) PK1 : TFFJ2U515A (V4299000) U, C, R, T, L models 0.01µ...

  • Page 80: Parts List

    GX-900 WARNING PARTS LIST Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally installed. ELECTRICAL PARTS Carbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL PARTS List. For the part Nos. of the carbon resistors refer to the last page.
  • Page 81 GX-900 P.C.B. CD Schm Schm Ref. PART NO. Description Ref. PART NO. Description V4004200 P.C.B. UR818100 C.EL 100uF 6.3V V2731000 CN.FMN UB044100 C.CE.M.CHP 0.01uF VU929500 CN.BS.PIN UR866100 C.EL VU534900 CN.BS.PIN UA954100 C.MYLAR 0.01uF VB390200 CN.BS.PIN UA954100 C.MYLAR 0.01uF VB389900 CN.BS.PIN UR866100 C.EL...
  • Page 82 GX-900 P.C.B. CD & MD Schm Schm Ref. PART NO. Description Ref. PART NO. Description VU889500 COIL 220uH UA953330 C.MYLAR 3300pF VR402300 TR 2SB647 C,D UA953220 C.MYLAR 2200pF VD678700 TR.DGT DTC114ES UR837220 C.EL 22uF iC287820 2SC2878 A,B UA953560 C.MYLAR 5600pF VD678700 TR.DGT...
  • Page 83 GX-900 P.C.B. INPUT Schm Schm Ref. PART NO. Description Ref. PART NO. Description V4003000 P.C.B. INPUT(A) UR866470 C.EL 4.7uF V4004100 P.C.B. INPUT(BG) UR866220 C.EL 2.2uF VQ963200 CN.BS.PIN UA953270 C.MYLAR 2700pF VM859600 CN.BS.PIN UR866470 C.EL 4.7uF CB10 VQ047500 CN.BS.PIN UR865220 C.EL 0.22uF...
  • Page 84 GX-900 P.C.B. INPUT Schm Schm Ref. PART NO. Description Ref. PART NO. Description C105 UB052100 C.CE.M.CHP 100pF C158 UR837100 C.EL 10uF C106 UB052100 C.CE.M.CHP 100pF C159 UN866100 C.EL C107 UB245100 C.CE.M.CHP 0.1uF C160 UB052100 C.CE.M.CHP 100pF C108 UB052100 C.CE.M.CHP 100pF C165 VF467300 C.CE.TUBLR 0.01uF...
  • Page 85 GX-900 P.C.B. INPUT & MAIN Schm Schm Ref. PART NO. Description Ref. PART NO. Description VV655300 TR.DGT DTA144EKA VQ328900 RSNR.CRYS 32.768KHz VV655300 TR.DGT DTA144EKA VJ828000 PIN IMSA-6024-03E VV655700 TR.DGT DTC144EKA BB071360 SCR.TERM 8.3x13 V3752400 TR.DGT DTC143TKA VV655500 TR.DGT DTC124EKA VV655500 TR.DGT...
  • Page 86 GX-900 P.C.B. MAIN & OPERATION Schm Schm Ref. PART NO. Description Ref. PART NO. Description C243 V3671000 C.EL 4700uF Q214 iC174020 2SC1740S R,S C244 UA953220 C.MYLAR 2200pF Q216 iC174020 2SC1740S R,S C245 UA953220 C.MYLAR 2200pF # Q218 VR510800 TR 2SD2396 J,K C246 VF467300 C.CE.TUBLR 0.01uF...
  • Page 87 GX-900 P.C.B. OPERATION & TUNER Schm Schm Ref. PART NO. Description Ref. PART NO. Description C863 UB012270 C.CE.M.CHP 270pF SW813 VG392900 SW.TACT SKHVAA C864 UB012270 C.CE.M.CHP 270pF SW814 VG392900 SW.TACT SKHVAA C868 UA953820 C.MYLAR 8200pF SW815 VG392900 SW.TACT SKHVAA C870 UA953820 C.MYLAR...
  • Page 88 GX-900 P.C.B. TUNER Schm Schm Ref. PART NO. Description Ref. PART NO. Description UB044470 C.CE.M.CHP 0.047uF GG000560 FLTR.CE SFE10.7MS3GHY-A(A) UR866100 C.EL * L1 V4545200 FLTR.CE SFE10.7MJA1(BG) UR865470 C.EL 0.47uF GG000560 FLTR.CE SFE10.7MS3GHY-A(A) UR866100 C.EL * L2 V4545200 FLTR.CE SFE10.7MJA1(BG) UR866100 C.EL...
  • Page 89 GX-900 P.C.B. MD MAIN Schm Schm Ref. PART NO. Description Remarks Ref. PART NO. Description Remarks AAX02260 P.C.B. MAIN 92LPWB2976MDSS * C1504 AAX02570 C.CHP 220pF VCCCCY1HH221J * C1100 AAX02530 C.CHP 4.7uF RCKZ0003AWZZ * C1505 AAX02540 C.CHP 100pF VCCCCY1HH101J * C1101 AAX02750 C.CHP...
  • Page 90 GX-900 P.C.B. MD MAIN Schm Schm Ref. PART NO. Description Remarks Ref. PART NO. Description Remarks * D1300 AAX02470 DIODE SB0209CP VHDSB0209CP1 * R1111 AAX01910 R.CAR.CHP 22KΩ 1/16W VRSCY1JB223J * D1301 AAX02470 DIODE SB0209CP VHDSB0209CP1 * R1112 AAX01910 R.CAR.CHP 22KΩ...
  • Page 91 GX-900 P.C.B. MD MAIN & OTHER Schm Schm Ref. PART NO. Description Remarks Ref. PART NO. Description Remarks * R1423 AAX01760 R.CAR.CHP 10KΩ 1/16W VRSCY1JB103J * R1706 AAX01790 R.CAR.CHP 1MΩ 1/16W VRSCY1JB105J * R1424 AAX01760 R.CAR.CHP 10KΩ 1/16W VRSCY1JB103J * R1707 AAX01750 R.CAR.CHP...
  • Page 92 GX-900 CHIP RESISTOR Schm Schm Ref. PART NO. Description Ref. PART NO. Description RD250000 R.CAR.CHP 0Ω 1/10W RD257510 R.CAR.CHP 51KΩ 1/10W RD253100 R.CAR.CHP 1Ω 1/10W RD257560 R.CAR.CHP 56KΩ 1/10W RD253220 R.CAR.CHP 2.2Ω 1/10W RD257680 R.CAR.CHP 68KΩ 1/10W RD253470 R.CAR.CHP 4.7Ω...
  • Page 93 GX-900 EXPLODED VIEW 2-82 2-51 10-11 2-62 2-61 2-82 10-13 1-96 10-1 2-63 10-14 2-82 2-64 1-96 2-82 1-91 1-95 2-70 1-21 1-96 2-83 1-98 7 (2) 1-96 2-83 1-90 1-96 1-60 1-97 5 (2) 1-62 1-20 1-22 1-31 1-96...
  • Page 94 GX-900 MECHANICAL PARTS Ref. Ref. PART NO. Description Remarks Markets PART NO. Description Remarks Markets * 1- 3 V4003300 P.C.B. ASS’Y OPERATION AAX07650 CASSETTE DECK MECH. UINT F511638 * 1- 7 V3728300 BAN-CARD 25P 380mm AAX07660 LOADING UNIT F511630 1- 8 MF125300 FLEXIBLE FLAT CABLE C&C...
  • Page 95 GX-900 EXPLODED VIEW (CD Mechanism Unit) MECHANICAL PARTS (CD Mechanism Unit) Ref. PART NO. Description Remarks Markets VU638400 CDC MECHANISM UNIT YMHB310 YMHB310 CX679550 BRACKET, CLAMP C3B1007 CX679540 BRACKET, GEAR C3D1002 CX679560 BRACKET, TRAY C3D1003 AX623770 SHAFT, FRICTION-B C3D8014 AX623780 SHAFT, PULLEY...
  • Page 96 GX-900 EXPLODED VIEW (Traverse Unit) Note : The parts marked with an asterisk ( ) are not available separately. Ref. They are included in a Traverse Unit and supplied as that unit. PART NO. Description Remarks Markets EX603810 WASHER C3D8018...
  • Page 97 GX-900 EXPLODED VIEW (Loading Unit) EXPLODED VIEW (Cassette Deck Mech. Unit) Ref. PART NO. Description Remarks Markets AAX07650 CASSETTE DECK MECH. UINT F511638 AAX07550 PLATE HD BLOCK F513831 AAX07450 MTR MAIN BLOCK F525327 AAX07470 PCB CONTROL BLOCK F567626 AAX07490 CLUTCH ASS’Y BLOCK...
  • Page 98 GX-900 EXPLODED VIEW (MD Recorder Unit) MECHANICAL PARTS (MD Recorder Unit) Ref. PART NO. Description Remarks Markets V3098100 MD RECORDER UNIT V3098100 AAX02240 MD GUIDE LANGF0033AWZZ AAX02250 MD GUIDE LANGF0034AWZZ AAX02930 DRIVE CHASSIS LCHSM0080AWM1 AAX02270 CARTRIDGE HOLDER LHLDX3004AWM1 AAX02280 CAM PLATE LEVER...

  • Page 99: Grease Application Diagram

    GX-900 GREASE APPLICATION DIAGRAM (MD Recorder) Ref. PART NO. Description Remarks Markets * 609 AAX01620 WASHER 1.2x3x0.2 LXWZ9269AFZZ * 610 AAX02990 SCREW M1.7x2.1 LXBZ0036AWZZ * 611 AAX01270 SCREW M1.7x8.9 LXBZ0852AFFD * 612 AAX01290 SCREW M2x4 XBPSD20P04K00 * 613 AAX01300 SCREW M1.7x3...
  • Page 100 GX-900 GREASE APPLICATION DIAGRAM (CD Mechanism) Grease to be supplied The same grease as that originally used is not Grease originally used Grease to be supplied available but a substitutive grease is supplied in- EM50L FLOIL G-351 P/NO. TX913160 stead. When using this grease, however, make sure...

  • Page 101: Remote Control Transmitter

    GX-900 REMOTE CONTROL TRANSMITTER NX-GX500 EXPLODED VIEW SCHEMATIC DIAGRAM KI/O6 KI/O5 IED1 KI/O7 KI/O4 KI/O3 S1/LED KI/O2 KI/O1 KI/O0 X OUT X IN 2.2Ω 47µF 3(V) RESET 3.64MHz CUSTOM DATA CUSTOM DATA FUNCTION FUNCTION (HEX) (HEX) (HEX) (HEX) A B C...
  • Page 102 GX-900 Parts List for Carbon Resistors 1/4W Type Part No. 1/6W Type Part No. 1/6W Type Part No. Value Value 1/4W Type Part No. 1.0 Ω 3100 3100 10 kΩ 7100 7100 HJ35 HF85 HF45 HF45 1.8 Ω 3180 7110 11 kΩ...
  • Page 103 GX-900...

This manual is also suitable for:

Nx-gx500

Table of Contents