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JVC UX-A4 Service Manual

JVC UX-A4
76 pages
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JVC
_
SERVICE
MANUAL
Contents
COMPACT
DIGITAL
AUDIO
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U.K.
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Continental
Europe
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Germany
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Northern
Europe
Page
Page
Safety
Precautions
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Specifications
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Instructions
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Electrical
Parts
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Location
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llustration
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Packing
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Parts
List
....-....0....
74
Removal
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Main
Parts
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Parts
List
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Accessories
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Main
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39
No.
1890
July
1993
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UX-A4
B/E/G/GI/EN
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JVC UX-A4 Specifications

General IconGeneral
CD PlayerYes
Radio TunerFM/AM
BluetoothNo
USB PortNo
Cassette DeckYes
Remote ControlYes
TypeMicro System
Power Output20W RMS
Speakers2 speakers included

Summary

1. Safety Precautions

Warning

Critical safety advisories for repairers and maintenance regarding equipment safety standards.

2. Safety Precaution about UX – A4

IMPORTANT FOR LASER PRODUCTS

Crucial safety information regarding the use of laser components and potential radiation hazards.

REPRODUCTION OF LABELS AND THEIR LOCATION

Information on identifying product labels and their placement on the unit.

IMPORTANT (In the United Kingdom)

Specific electrical safety guidelines for users in the United Kingdom, including plug and fuse replacement.

Important points for safety management

3. Features

4. Specifications

5. Instructions (Extract)

CD player/General section

Details on CD player operation and identification of main unit controls.

Tuner/Deck section

REMOTE CONTROL UNIT

Preparation before use

Steps for installing batteries and initial setup of the remote control.

Using the remote control unit

Guidelines for effective operation of the remote control, covering range and sensor usage.

Remote Control Operations

SWITCHING THE POWER ON/OFF

COMPU PLAY

Functionality for automatic power-on and playback initiation by selecting a source.

Sound mode button

PLAYING COMPACT DISCS

Steps for playing entire discs and basic playback controls like play, pause, and track selection.

To stop play

Methods for stopping CD playback temporarily or completely using the /CLEAR button.

Skip playback

Direct access playback (using the remote control)

Using numbered buttons on the remote for direct track selection without pressing CD/II.

Search playback

Locating specific points within a disc using fast-forward or reverse search functions.

Programmed play (using the remote control)

Repeat play (using the remote control)

Random playback (using the remote control)

Playing tracks in a random order on a disc using the RANDOM button.

INTRO scan operation

Function to play the first few seconds of each track using the INTRO scan button.

Music scan

RADIO RECEPTION

FM MODE button

Settings for FM stereo and mono reception to optimize broadcast quality.

Seek tuning

Automatic tuning to the next available station by pressing UP or DOWN buttons.

Auto preset tuning

Manual tuning

Manually adjusting the tuner frequency step-by-step.

Presetting stations

Manually saving specific radio stations to preset buttons for easy recall.

Using the antennas

Instructions for connecting and adjusting the FM feeder and AM loop antennas.

RECORDING

CD edit recording (for CDs with up to 20 tunes)

How to record CDs onto tape, optimizing tape usage by calculating optimal length and dividing tracks.

Synchronized recording with the CD player

Recording from the radio

Erasing

Process for erasing content from pre-recorded tapes before making a new recording.

CLOCK/TIMER ADJUSTMENT

Setting the current time

Step-by-step guide to setting the unit's internal clock accurately.

Setting the timer

Procedure for configuring timer start time, stop time, and mode for automated operations.

Set the stop time

Select the TIMER mode

Choosing the type of timer operation (CD, Tape, Tuner).

Set the volume

Adjusting the volume level for timer operations, including fade-in and fade-out.

TIMER OPERATIONS

Timer recording of broadcast

Detailed steps for timer-based recording of radio programs, ensuring correct time and station settings.

Timer playback

Instructions for timer-activated playback of CDs, tapes, and broadcasts.

6. Location of Main Parts

Tape Deck/Amplifier Section

Location of parts within the tape deck and amplifier assembly, shown in diagrams.

CD/Tuner Section

Location of parts within the CD player and tuner assembly, shown in diagrams.

7. Removal of Main Parts and Analytic Drawing

Separation of Front Panel Ass'y and Power Supply Unit Ass'y

Analytic Drawing (1) Parts List

List of parts corresponding to the first analytic drawing, detailing part numbers and names.

Analytic Drawing (2): Block No. M 2

Analytic Drawing (2) Parts List

Disassembly of Front Panel Ass'y

Specific instructions for disassembling the front panel assembly, including connector and wire removal.

Operation Key Switch P.C. Board and Front Panel

Power Amplifier Power Supply Ass'y

Steps for disassembling the power amplifier and supply assembly, including transformer and heat sink removal.

Disassembly of CD Player Ass'y and Front Panel Ass'y

Metal Cover

Steps for removing the unit's metal cover, detailing screw locations.

Front Panel Ass'y

Instructions for disassembling the front panel, including wire and connector separation.

CD Player Ass'y

Specific steps for disassembling the CD player mechanism, including cover and wire removal.

LCD Microcomputer P.C. Board

Tuner P.C. Board

Removal instructions for the tuner PC board, detailing connector and screw locations.

Function P.C. Board

Removal instructions for the function PC board, detailing connector and screw locations.

Operation Key Switch P.C. board

Removal instructions for the operation key switch PC board from the front panel.

Analytic Drawing (3): Block No. M 3

Analytic Drawing (3) Parts List

Parts list corresponding to the third analytic drawing, detailing part numbers, names, and quantities.

Analytic Drawing (5): Block No. M 5

Reel and Actuator motor assembly

Leaf switch board

Instructions for removing the leaf switch board, detailing screw and pawl disengagement.

CD/Tuner Section

Analytic Drawing (4): Block No. M 4

Analytic Drawing (4) Parts List

Parts list corresponding to the fourth analytic drawing, detailing part numbers, names, and quantities.

Head mount assembly (A)

Pinch roller assembly

Steps for removing the pinch roller assemblies, detailing pawl and roller disengagement.

Capstan motor and Flywheel

Procedures for removing the capstan motor and flywheel, including belt disengagement.

Reel and Actuator motor assembly

Leaf switch board

Instructions for removing the leaf switch board, detailing screw and pawl disengagement.

Analytic Drawing of Cassette mechanism: Block No. M 7

8. Main Adjustments

Test Instruments required for adjustment

List of necessary tools and equipment for calibration and testing.

Test remarks

Important notes and precautions for performing testing and adjustment procedures.

Measuring conditions (Amplifier section)

Specific conditions, supply voltage, and reference output for amplifier adjustments.

Measuring condition (Radio section)

Reference output and frequency conditions for radio section adjustments.

Standard position of functionswitches

Default settings for operational switches like Tape Select and DOLBY NR.

Standard position of switches and controllers

Default settings for various controls including Beat Cut and Sound mode switches.

Standard position of volume control

Default settings for volume, bass, and treble controls.

Careful points for adjustment

Key considerations for performing accurate adjustments, including capacitor and resistor connections.

RF Alignment order

The sequence for radio frequency alignment, including IF sweeper settings.

Tuner Section

LW RF tracking check and adjust

Steps to check and align LW radio frequency, including measurement points and oscillator settings.

MW or AM RF tracking check and adjust

Steps to check and align MW/AM radio frequency, including measurement points and oscillator settings.

FM RF tracking check and adjust (UX - A4 B)

FM tracking adjustment for UX-A4 B model, specifying test points and oscillator frequencies.

FM RF tracking check and adjust (UX A4 E/G/GI/EN)

FM tracking adjustment for UX-A4 E/G/GI/EN models, specifying test points and oscillator frequencies.

AM IF tadjust and Check

FM IF adjust and Check

Mechanism & Amplifier Sections

Head azimuth adjustment

Aligning the playback head for optimal sound by adjusting azimuth screws.

Tape speed adjustment

Calibrating the tape transport speed by adjusting VR801 for accurate playback.

Wow and flutter check

Measuring tape speed variations (wow and flutter) at different positions.

Playback output level adjustment

Adjusting the signal level for playback to ensure standard output within specified tolerances.

Frequency response check

Verifying the audio frequency range response by comparing levels at different frequencies.

11. Standard Schematic Diagram

CD Amplifier P.C. Board: Drawing No. VMW1308, Block No. 8

Operation Key Switch P.C. Board: Drawing No. VMW2375, Block No. 07

Function P.C. Board: Drawing No. VMW1320B, Block No. 05

12. Location of P.C. Board Parts

CD/Tuner Section

Component locations on the CD/Tuner circuit boards, illustrated with diagrams.

LCD/Micro Computer P.C. Board: Drawing No. VMW1320A, Block No. 05

9. Block Diagram

Cassette mechanism specification

Cassette mechanism part

13. Electrical Parts

Tuner Section

Mechanism & Amplifier Sections

Arrangement of adjusting positions

Tuner P.C.board: UX - A4 B

Adjustment points on the tuner board for UX-A4 B model, indicating VR and TC locations.

Tuner P.C.board: UX - A4 E/G/GI/EN

Adjustment points on the tuner board for UX-A4 E/G/GI/EN models, indicating VR and TC locations.

Analytic drawing of CD Mechanism

CD Mechanism Parts List

List of parts for the CD mechanism, detailing part numbers, names, and quantities.

Reel and Actuator motor assembly

Leaf switch board

Instructions for removing the leaf switch board, detailing screw and pawl disengagement.

Head mount assembly (A)

Pinch roller assembly

Steps for removing the pinch roller assemblies, detailing pawl and roller disengagement.

Capstan motor and Flywheel

Procedures for removing the capstan motor and flywheel, including belt disengagement.

Cassette Mechanism Parts List

Analytic Drawing of Cassette mechanism: Block No. M 7

Analytic Drawing of Speaker Box: Block No. M 6

CD Amplifier P.C. Board: Drawing No. VMW1308, Block No. 8

Operation Key Switch P.C. Board: Drawing No. VMW2375, Block No. 07

Tape Deck/Amplifier Section

Power Amplifier P.C. Board: Drawing No. VMW1321A, Block No. 02

Layout of the power amplifier circuit board, showing component placement.

Fuse P.C. Board: Drawing No. VMW1321B, Block No. 01

Layout of the fuse circuit board, showing component placement.

Power Trans P.C. Board: Drawing No. VMW1321C, Block No. 01

Head Phone Jack P.C. Board: Drawing No. VMW1321H, Block No. 03

Layout of the headphone jack circuit board, showing component placement.

Recording Amplifier P.C. Board: Drawing No. VMW1321F, Block No. 04

Opepration Key Switch P.C. Board: Drawing No. VMW1321G, Block No. 04

Layout of the operation key switch circuit board, showing component placement.

Mechanism Control P.C. Board: Drawing No. VMW1321D, Block No. 04

Function P.C. Board

LCD/Micro Computer P.C. Board

Operation Key Switch P.C. Board

Function P.C. Board

14. Illustration of Packing and Parts List

15. Accessories

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