JVC MX-G500 Service Manual

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Instructions manual (60 pages)

Instruction manual (38 pages)

Summary of Contents for JVC MX-G500

Page 1: Table Of Contents
MX-G500 SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-G500 Area suffix J ------------------- U.S.A. C ---------------- Canada DISC CHANGE STAND BY STANDBY/ON CD-R/RW PLAYBACK MX -G500 SOUND MO DE STAN DBY/ ON CLOCK /TIMER SUBW OOFER LEVEL SLEEP DISPLAY SOUN D M ODE...
Page 2 MX-G500 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.
Page 3: Importance Administering
MX-G500 Importance administering point on the safety 4A 125V RFS5 4A 125V RFS6 4A 125V RFS7 4A 125V RFS2 4A 125V RFS8 Fuse board (Forward side) Power supply board (Forward side) Caution: For continued protection against risk of fire, replace only with same type 4A/125V for RFS2, RFS5, RFS6, RFS7 and RFS8.
Page 4: Preventing Static Electricity
MX-G500 Preventing static electricity 1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
Page 5: Disassembly Method
MX-G500 Metal cover Disassembly method Removing the metal cover (See Fig.1) Remove the three screws A attaching the metal cover on the back of the body. Remove the six screws B attaching the metal cover on the both sides of the body.
Page 6 MX-G500 CW107 CD servo board CW105 Rear panel CD changer unit RCW6 Fig.6 Front panel assembly CD changer unit Main board Fig.5 (both sides) Rear panel Fig.7 Removing the front panel assembly FCW3 Front panel Main board JCW2 (See Fig.8 to 10)
Page 7 MX-G500 Joint2 (Bottom side) Removing the heat sink & amp. board (See Fig.8, 11 and 12) Prior to performing the following procedure, remove the metal cover and the CD changer unit. Fig.10 Disconnect the card wire from the connector ACW1...
Page 8 MX-G500 FCW3 Removing the main board (See Fig. 14) Prior to performing the following procedure, remove JCW2 the metal cover, CD changer unit and rear panel. JCW1 Main board Disconnect the card wire from the connector FCW3 HCW3 and the harness from the connector JCW1, JCW2 Fuse board and HCW3 on the main board.
Page 9 MX-G500 Front panel assembly (inner side) <Front panel assembly> Power / CD switch board Prior to performing the following procedure, remove the metal cover, the CD changer unit and the front panel assembly. UCW1 FL diplay & Removing the power / CD switch board...
Page 10 MX-G500 CD changer uint (reverse side) <CD changer unit> Prior to performing the following procedure, remove the CD changer unit. CD servo board CW103 Removing the CD tray (See Fig.1 to 3) Turn the black loading pulley gear on the under side of the CD changer unit in the direction of the arrow and draw the CD tray toward the front until it stops.
Page 11 MX-G500 Removing the sensor board / the turn table motor assembly (See Fig.6 to 8) Prior to performing the following procedure, remove the CD tray. Remove the screw A attaching the sensor board and release the two tabs b attaching the sensor board on the under side of the CD tray.
Page 12 MX-G500 Removing the belt, the CD servo board and the switch board (See Fig.9 and 10) Belt Prior to performing the following procedure, remove the CD tray. Detach the belt from the pulley on the upper side of the CD changer unit (Do not stain the belt with grease).
Page 13 MX-G500 Removing the CD mechanism holder assembly (mechanism included) Motor connecter (See Fig.11 to 14) Disconnect the harness from connector on the CD mechanism board in the CD mechanism assembly on the under side of the CD changer unit. Disconnect the card wire from the pickup unit connector.
Page 14 MX-G500 <CD mechanism section> Shutter Shaft Pickup unit Removing the CD mechanism holder from the CD • chager unit. (Refer to "Removing the CD mechanism holder assembly" ) Removing the pickup unit See Fig.1) 1. Removing the cut washer on the feed gear sleeve and pull out the feed gear.
Page 15: Cassette Mechanism Section
MX-G500 R/P Head <Cassette mechanism section> Removing the record/playback mechanism. Removing the R/P head. 1. Remove the screw A on the right side of the R/P head.(Fig.1, Fig.2) 2. Remove the screw B on the left side of the R/P head.(Fig.1, Fig.2) Remove the erase head.
Page 16 MX-G500 Motor Mecha. terminal board Removing the motor. 1. Remove the two screws D fixing the motor. Be careful to grease's splash when the drive belt comes off.(Fig.5, Fig.6) 2. Unsolder the motor terminal.(Fig.5) Removing the mechanism board. Unsolder the four parts a on the solenoid...
Page 17 MX-G500 (long wood screw) < Speaker section > (short wood screw) It is exchange in a unit. Please do not decompose as much as possible. Boss and adhesion Removing the side panel (See Fig. 1) Remove the five screws A attaching the side panel A(long screw) and remove the side panel.
Page 18: Wiring Connection
MX-G500 Wiring connection Color codes are shown below. Brown Orange Yellow Green Blue Violet Gray White Black 1-18...
Page 19: Adjustment Method
MX-G500 Adjustment method 1. Tuner * Adjustment Location of Tuner PCB AM(MW) RF AM(MW) OSC ITEAM Adjustment Adjustment Received FREQ. 603 KHz 530~1710 KHz Adjustment point Maximum 1~7.0 0.5V Output Output(Fig.1) MAIN TESTER Fig.1 OSC Voltage 1-19...
Page 20 MX-G500 FM THD Adjustment SSG FREQ. 98 MHz Adjustment Output Antenna point FM DETECTOR COIL Terminal (FM DET) Oscilloscope FM S.S.G Input 60 dB Output Speaker Minumum Distortion (0.4% below) Terminal output Input (Fig.2) Distortion Meter Fig.2 IF CENTER and THD Adjustment FM Search Level Adjustment SSG FREQ.
Page 21 MX-G500 2. Cassette Deck To adjust tape speed Notes Cassette Deck Frequency Counter 1) Measuring tape: i) VT-712/MTT-111(or equivalent) (Tapes recorded with 3kHz) SPK OUT ii) AC-225/MTT-5512(or equivalent) output Fig.1 2) Connect the cassette deck to the frequency counter as in fig.1.
Page 22 MX-G500 2. Adjust Deck 2 Play Level/REC BIAS Pre-Setup Step Item Pre-Setup To Adjust Standard Remark Condition After putting VT-703 AZIMUTH SPK OUT Turn the control Max output After into Deck 2 (VTVM is screw to as and same phase...
Page 23: Flow Of Functional Operation Until Toc Read
MX-G500 Flow of functional operation until TOC read Check Point Play Key RESET a CD LSI Power ON Confirm that the voltage at the pin17 of KB9226(IC101) is "L" "H". Confirm that the voltage at the pin33 LIMIT SW ON of KB9226(IC101) is "H"...
Page 24: Maintenance Of Laser Pickup
MX-G500 Maintenance of laser pickup (1) Cleaning the pick up lens (2) Life of the laser diode Before you replace the pick up, please try to When the life of the laser diode has expired, clean the lens with a alcohol soaked cotton the following symptoms will appear.
Page 25: Troubleshooting
MX-G500 Troubleshooting 1. Amplifier Power malfunction No output 1-25...
Page 26 MX-G500 2.Tuner malfunction (FM/AM) 3.Tape HA12235F 3,4,27,28 HA12235F JIC1(HA12235F) PIN5,26 JC63L,JC63R,JR65L,JR65R 1-26...
Page 27 MX-G500 4.CD 1-27...
Page 28: Description Of Major Ics
MX-G500 Description of major ICs 5L9290 (IC201) : Digital signal processor for CDP 1. Pin layout VSSA_PLL BCKO VCO1LF LRCKO VSSD_PLL SADTO VDDD_PLL DATX VDDD1_5V C2PO S5L9290X JITB DSP+DAC XOUT SBCK 48-LQFP-0707 VSSD1_5V VDDD3-5V EFMI VSSD2-3V LOCK VDDD2-3V SMEF MUTE...
Page 29 MX-G500 3. Pin function Symbol Function VSSA_PLL Analog Ground for DPLL VCO1LF Pump out for VCO1 VSSD_PLL Digital Ground Separated Bulk Bias for DPLL VDDD_PLL Digital Power Separated Bulk Bias for DPLL (3V Power) VDDD1-5V Digital Power (5V Power, I/O PAD) X'tal oscillator input (16.9344MHz)
Page 30 MX-G500 KB9226 (IC101) : RF amp. & servo signal processor 1. Pin layout PDAC PDBD LOCK WDCK S1L9226X CLVI RESET DCCI DCCO MDATA VREF ISTAT 2. Block diagram Center Tracking Error RF & Focus RF AGC & EQ Voltage (RW)
Page 31 MX-G500 3. Pin function Pin No. Symbol Function RF summing amp. inverting input RF summing amp. output RFO DC eliminating input(use by MIRROR, FOK ,AGC & EQ terminal) RF equalizer output EFMI EFM slice input. (input impedance 47K) Main power supply...
Page 32 MX-G500 LC72131(IC02) : PLL frequency synthesizer for electron alignment 1. Pin layout 2. Block diagram XOUT Phase Reference Detector Driver AOUT Charge Pump Swallow Counter FMIN 1/16,1/17 4bits Unlock AMIN Detector IFIN 12bits Programmable Divider Universal Data Shift Register & Latch...
Page 33 MX-G500 3.Pin function (2/2) Symbol Pin No. Type Functions Circut confguration Used as the synchronization clock when serial data is input Clock to the LC72131 (DI ), or when serial data is output (DO). Inputs serial data sent from the controller to the LC72131M.
Page 34 MX-G500 HA12235 (JIC1) : Audio signal processor 1. Block diagram REC OUT(L) REC OUT(R) ALC(R) ALC(L) REC IN(L) REC IN(R) PB OUT(L) PB OUT(R) 0.1u 0.1u TAI(L) TAI(R) EQOUT(L) EQOUT(R) PB-EQ(L) PB-EQ(R) PB-NF2(L) PB-NF2(R) 1-34...
Page 35 MX-G500 2. Pin function Pin No. Symbol Function PB-NF2(R) PB EQ feed back PB-EQ(R) NAB output EQOUT(R) EQ output TAI(R) Tape input PBOUT(R) PB output NC pin RECIN(R) REC-EQ input NC pin RECOUT(R) REC output ALC ON/OFF Mode control input...
Page 36 MX-G500 M66010 (UIC2) : I/O control 1.Pin layout 2.Block diagram Shift register 1 SERIAL DATA OUTPUT D24 D23 D22 D3 D2 D1 CLOCK INPUT SET INPUT CHIP SELECT Q24 Q23 Q22 Q3 Q2 Q1 PARALLEL INPUT Parallel output latch DATA I/O...
Page 37 MX-G500 TDA7442D (FIC1) : Audio processor 1.Pin layout R_IN3 R_IN4 R_IN2 LOUT R_IN1 ROUT L_IN1 AGND L_IN2 L_IN3 CREF L_IN4 MUXOUTL IN(L) DIG-GND MUXOUT(R) TREBLE(R) IN(R) TREBLE(L) BIN(R) BOUT(R) BIN(L) BOUT(L) 2.Block diagram 5.6K 5.6nF 100nF 100nF 100nF 2.2 F...
Page 38 MX-G500 L4959 (RIC1) : Voltage regulator 1.Pin layout OUT 12V(a) OUT 8.6V EN 8.6V EN 12V(a) EN 12V(b) N.C. OUT 5.6V OUT 12V(b) TAB CONNECTED TO PIN 6 D97AU716A 2.Block diagram 2/10 5.6V, 250mA OUT 5.6V REGULATOR 8.6V, 600mA OUT 8.6V...
Page 39 MX-G500 KA9258D (IC301) : 4-ch Motor driver 1.Block diagram 28 27 26 25 24 23 22 21 20 19 18 17 16 15 REGULATOR T • S • D MUTE 10 11 12 13 14 LA1837 (IC01) : FM IF/DET AM RF/IF/DET 1.Block diagram...
Page 40 MX-G500 LC86P6548 (UIC1) : Microcontroller 1.Pin layout S19/PC3 S48/PG0 S18/PC2 S49/PG1 S17/PC1 S50/PG2 S51/PG3 S16/PC0 VDD3 S15/T15 S14/T14 S13/T13 S12/T12 VSS2 S11/T11 VDD2 S10/T10 S9/T9 S8/T8 S7/T7 P10/SO0 S6/T6 S5/T5 P11/SI0/SB0 S4/T4 P12/SCK0 S3/T3 P13/SO1 P14/SI1/SB1 S2/T2 S1/T1 P15/SCK1 2.Block diagram...
Page 41 MX-G500 KA3082 (IC401, IC402) : DC motor driver 1.Pin layout DRIVER OUT PRE DRIVER LOGIC SWITCH 2.Pin function Pin No. Function Symbol Ground Output 1 Phase compensation VCTL Motor speed control Input 1 VIN1 VIN2 Input 2 Supply voltage (Signal)
Page 42 MX-G500 VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.21068) 200202(V)

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JVC MX-G500 Service Manual

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