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JVC MX-GT98V User Manual

JVC MX-GT98V
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.21026
Sep. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
MX-GT98V/MX-GT95V
MX-GT88V/MX-GT85V
MX-G78V/MX-G75V
Safety precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-29
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-33
1-34
1-34
1-35~49
Contents
(No MIC jack and MIC LEVEL volume for UN ver.)
MX-GT98V/MX-GT95V/MX-GT88V
MX-GT85V/MX-G78V/MX-G75V
COMPACT
DIGITAL VIDEO
COMPACT
DIGITAL AUDIO
Area suffix
US -------- Singapore
UN --------------Asean
SP-MXGT98V
SP-MXGT95V
SP-MXGT98V
SP-MXGT95V
CA-MXGT98V
CA-MXGT95V
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JVC MX-GT98V Specifications

General IconGeneral
TypeMicro Music System
CD PlayerYes
Radio TunerYes
Power Output100W
BluetoothNo
USB PortNo
Amplifier Output100W
Number of Discs1
Remote ControlYes
Speakers2
FunctionsCD, Radio
Cassette DeckYes

Summary

Safety Precautions

Important Laser Product Safety

Preventing Static Electricity Damage

Disassembly Method

Main Body Disassembly

Procedure for disassembling the main body of the unit.

CD Changer Mechanism Assembly Removal

Step-by-step guide to remove the CD changer mechanism assembly.

Fan Removal

Procedure for removing the fan component.

Front Panel Assembly Removal

Steps to remove the front panel assembly from the unit.

Tuner Board Removal

Procedure for removing the tuner board.

Rear Cover and Panel Removal

Steps to remove the rear cover and rear panel.

Main Board Removal

Procedure for removing the main electronic board.

Speaker Board Removal

Steps to remove the speaker board.

Power Board Removal

Procedure for removing the power supply board.

Amplifier Board, Voltage Board, and Heat Sink Removal

Steps to remove amplifier board, voltage board, and heat sink.

Power Transformer Assembly Removal

Procedure for removing the power transformer assembly.

Regulator Board Removal

Steps to remove the regulator board.

Power Cord Removal

Procedure for removing the power cord from the unit.

Cassette Mechanism Assembly Removal

Procedure for removing the cassette mechanism.

Display System Control Board Removal

Steps to remove the display system control board.

CD Eject Board Removal

Procedure for removing the CD eject board.

Preset/Tuning Switch Board Removal

Steps to remove the preset/tuning switch board.

Operation Switch Board Removal

Procedure for removing the operation switch board.

CD Servo Control Board Removal

Steps to remove the CD servo control board.

CD Tray Assembly Removal

Procedure for removing the CD tray assembly.

CD Loading Mechanism Assembly Removal

Steps to remove the CD loading mechanism assembly.

CD Traverse Mechanism Removal

Procedure for removing the CD traverse mechanism.

CD Pick-up Unit Removal

Steps to remove the CD pick-up unit.

Tray Select Switch Board Removal

Steps to remove the tray select switch board.

Cam Unit Removal

Procedure for removing the cam unit.

Actuator Motor and Belt Removal

Steps to remove the actuator motor and belt.

Cams R1/R2 Assembly and Cam Gear Removal

Procedure for removing cams and cam gear.

C.G. Base Assembly Removal

Steps to remove the C.G. base assembly.

Speaker Section for MX-GT98V/MX-GT95V

Speaker Front Panel Removal

Steps to remove the front panel of the speaker.

Speaker Tweeter Removal

Procedure for removing the tweeter speaker component.

Speaker Sub Panel Removal

Steps to remove the sub panel of the speaker.

Speaker Squawker Removal

Procedure for removing the squawker speaker component.

Speaker Woofer Removal

Steps to remove the woofer speaker component.

Speaker Duct Removal

Procedure for removing the duct from the speaker.

Speaker Section for MX-GT88V/MX-GT85V

Speaker Front Panel Removal (GT88V/GT85V)

Steps to remove the front panel of the speaker for specific models.

Speaker Tweeter Removal (GT88V/GT85V)

Procedure for removing the tweeter speaker for specific models.

Speaker Squawker Removal (GT88V/GT85V)

Procedure for removing the squawker speaker for specific models.

Speaker Woofer Removal (GT88V/GT85V)

Steps to remove the woofer speaker for specific models.

Speaker Sub Panel Removal (GT88V/GT85V)

Steps to remove the sub panel for specific speaker models.

Speaker Duct Removal (GT88V/GT85V)

Procedure for removing the duct from the speaker for specific models.

Speaker Section for MX-G78V/MX-G75V

Speaker Side Cover Removal (G78V/G75V)

Steps to remove the side cover of the speaker for specific models.

Speaker Squawker Removal (G78V/G75V)

Procedure for removing the squawker speaker for specific models.

Speaker Front Cover Removal (G78V/G75V)

Steps to remove the front cover of the speaker for specific models.

Speaker Woofer Removal (G78V/G75V)

Steps to remove the woofer speaker for specific models.

Speaker Tweeter Removal (G78V/G75V)

Procedure for removing the tweeter speaker for specific models.

CD Changer Mechanism Section

CD Servo Control Board Removal

Steps to remove the CD servo control board.

CD Tray Assembly Removal

Procedure for removing the CD tray assembly.

CD Loading Mechanism Assembly Removal

Steps to remove the CD loading mechanism assembly.

CD Traverse Mechanism Removal

Procedure for removing the CD traverse mechanism.

CD Pick-up Unit Removal

Steps to remove the CD pick-up unit.

Tray Select Switch Board Removal

Steps to remove the tray select switch board.

Cam Unit Removal

Procedure for removing the cam unit.

Actuator Motor and Belt Removal

Steps to remove the actuator motor and belt.

Cams R1/R2 Assembly and Cam Gear Removal

Procedure for removing cams and cam gear.

C.G. Base Assembly Removal

Steps to remove the C.G. base assembly.

Cassette Mechanism Section

Playback, Recording, and Eraser Heads Removal

Procedure for removing playback, recording, and eraser heads.

Reassembling Playback, Recording, and Eraser Heads

Steps for reassembling playback, recording, and eraser heads.

Head Amp. and Mechanism Control Board Removal

Procedure for removing the head amp and mechanism control board.

Capstan Motor Assembly Removal

Steps to remove the capstan motor assembly and belts.

Capstan Motor Removal

Procedure for removing the capstan motor.

Flywheel Removal

Steps to remove the flywheels.

Reel Pulse Board and Solenoid Removal

Procedure for removing the reel pulse board and solenoid.

Adjustment Method

Required Measurement Instruments for Adjustment

List of instruments needed for performing adjustments.

Measurement Conditions

Conditions required for measurement and adjustment.

Measurement Precautions

Important precautions to observe during measurement.

Arrangement of Adjusting Positions

Diagram showing locations of adjustment points.

Tape Recorder Section Adjustments

Adjustments specific to the tape recorder section.

Reference Values for Confirmation

Reference values for confirming adjustments.

Electrical Performance

Recording Bias Current Adjustment

Procedure for adjusting the recording bias current.

Recording and Playback Frequency Characteristics Adjustment

Adjusting frequency characteristics for recording and playback.

Electrical Function Confirmation Reference Values

Reference values for confirming electrical functions.

Flow of Functional Operation until TOC Read

Maintenance of Laser Pickup

Laser Pickup Lens Cleaning

Procedure for cleaning the laser pickup lens.

Laser Diode Lifespan and Symptoms

Symptoms indicating the end of the laser diode's life.

APC PC Board Semi-Fixed Resistor Adjustment

Information on the APC PC board semi-fixed resistor for laser power.

Replacement of Laser Pickup

Description of Major ICs

AN7345K (IC302) PB/REC Amplifier Description

Block diagram and pin function description for the PB/REC amplifier.

MN101C35DEA (IC810) System Controller Description

Pin function details for the system controller IC.

BU4094BCF (IC303) Serial to Parallel Port Extender

Pin layout, block diagram, and pin function for the port extender.

AN22000A-W (IC601) Digital Servo Head Amplifier

Block diagram and pin function for the digital servo head amplifier.

BA3837 (IC466) Microphone Mixer Description

Block diagram and pin function for the microphone mixer.

BA15218 (IC481, etc.) Operational Amplifier Description

Description of operational amplifier ICs.

BU9253AS (IC902) LPF & Echo Mix IC Description

Pin layout and block diagram for LPF & Echo mix IC.

LA1838 (IC1) FM/AM IF Amp, Detector, MPX Decoder

Block diagram and pin function for FM/AM IF amplifier and decoder.

LA6541-X (IC801) Servo Driver Description

Pin layout and block diagram for the servo driver IC.

LC72136N (IC2) PLL Frequency Synthesizer Description

Pin layout, block diagram, and pin function for PLL synthesizer.

STK402 Power Amplifier IC Description

Pin layout and block diagram for STK402 series power amplifiers.

STK412 Power Amplifier IC Description

Schematic diagram for STK412 series power amplifiers.

TDA7439 (IC436) Control Volume IC Description

Pin layout and block diagram for the control volume IC.

BA3835S (IC812) SPI B.P.F. IC Description

Block diagrams and pin function for the SPI B.P.F. IC.

BU2092/F (IC811) Port Expander IC Description

Terminal layout and pin function for the port expander IC.

BA3126N (IC301) R/P Switch Description

Diagram for the R/P switch IC.

LB1641 (IC851, IC852) DC Motor Driver Description

Pin layout and pin function for DC motor drivers.

NJM4580L (IC901) Microphone Amplifier Description

Pinout for the US version microphone amplifier IC.

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