JVC UX-A52R Service Manual

SERVICE MANUAL

MICRO COMPONENET SYSTEM

UX-A52R

- RDS -

COLOR

DIMMER

CONTROL

STANDBY/ON

CLOCK

SLEEP

FM MODE

/TIMER

1 2 3

DISPLAY

4 5 6

DISPLAY

TA/NEWS

PTY

/INFO

7 8 9

SELECT–+

SET

CANCEL

REPEAT

PLAY MODE

REV.MODE

FM/AM

TAPE

AUX/MD

BEEP

SOUND

AHB

VOLUME

MODE

PRO

RM-SUXA52R

Contents

Safety precautions Preventing static electricity Important for laser products Disassembly method Adjustment Method

PHONES

1-2 1-4 1-5 1-6 1-25

MICRO COMPONENT SYSTEM UX-A52R

COMPACT

DIGITAL AUDIO

STANDBY/ON

B ---------------------------- U.K. E -------- Continental Europe EN ----------- Nor them Europe

Flow of functional operation until TOC read (CD) Maintenance of laser pickup Replacement of laser pickup Description of major ICs

Area Suffix

1-29 1-30 1-30 1-31~49

No.21064

Feb. 2002

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UX-A52R

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.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

1. This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety.

(This regulation does not correspond to J and C version.)

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UX-A52R

(U.K only)

2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; furthermore the manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom.

3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other than those listed in the manual. Please note

however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and may create shock, fire, or other hazards.

1. Service should be performed by qualified personnel only.

2. This equipment has been designed and manufactured to meet international safety standards.

3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

4. Repairs must be made in accordance with the relevant safety standards.

5. It is essential that safety critical components are replaced by approved parts.

6. If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

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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.

2.About the earth processing for the destruction prevention by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

2-2 Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

4.Handling the traverse unit (optical pickup)

1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the substrate.

Shorting round

1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

2.Please remove solder after connecting the card wire with when you install picking up in the substrate.

1-4

Flexible wire

Shorting round

CN601 on mechanism board

Important for laser products

UX-A52R

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

5.CAUTION : If safety switches malfunction, the laser is able to function.

6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1 LASER PRODUCT

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Disassembly method

Removing the rear cover

(See Fig.1 and 2)

Remove the eight screws A on the back of the body.

Remove the two screws B on the bottom of the body.

Unlock the speaker terminal and the antenna terminal, then remove the rear cover backward with releasing the hooks.

Removing the side panels

(See Fig.3 to 5)

Prior to performing the following procedure, remove the rear cover.

Rear cover

Antenna terminal

Side panel (R)

Speaker terminal

Fig.1

(Bottom)

Rear cover

Remove the two screws C attaching the side panels on the bottom of the body.

Remove each side panel backward while releasing the eight joints a as shown in Fig.4 and 5.

Joint a

Side panel (L)

Fig.2

Side panel (R)

Side panel (L)

Fig.3

Joint a

1-6

Side panel (R)

Fig.4

Side panel (L)

Fig.5

Removing the top panel (See Fig.6 and 7)

UX-A52R

Prior to performing the following procedure, remove the rear cover and the side panels.

Remove the two screws D on each side of the body.

Release the two joints b on each side of the body and remove the top panel in the direction of the arrow.

Disconnect the card wires from connector CN705 on the system control board on the left side of the body.

Joint b

Top panel

Fig.6

CN705

Joint b

Removing the cassette mechanism assembly section (See Fig.8)

Prior to performing the following procedure, remove the rear cover, the side panels and the top panel.

Disconnect each wire from connector CN706, CN715 and CN716 on the system control board on top of the body.

Remove the four screws E retaining the cassette mechanism assembly section on top of the body.

REFERENCE:

Reference: If necessary, remove the spacer marked h and the wire from the Cassette mechanism assembly section.

h (spacer)

System control board

Fig.7

E E

CN715

Cassette mechanism section

Fig.8

System control board

CN706

CN716

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UX-A52R

Removing the system control board

(See Fig.9)

Prior to performing the following procedure, remove the rear cover, the side panels and the top panel.

Disconnect the card wire from connector CN701 and the wire from connector CN706, CN715, CN716 on the system control board.

Remove the screw F on the left side of the body.

Disconnect connector CN709, CN711 and CN712 on the system control board from the body outward.

Disconnect the card wire from connector CN704 on the underside of the system control board.

Removing the tuner board (See Fig.10)

Prior to performing the following procedure, remove the rear cover and the right side panel.

CN706

CN716

CN712

CN704

CN715

CN701

CN711

CN709

System control board

Fig.9

Tuner board

Disconnect the card wire from connector CN1 on the tuner board on the right side of the body.

Remove the screw G and remove the tuner board upward while disengaging the three joints c.

CN1

Joints c

Fig.10

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UX-A52R

Removing the front panel assembly

(See Fig.11 and 12)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel and the system control board.

Release the two joints d on the lower right and left sides of the front panel assembly, then remove the front panel assembly toward the front.

Front panel assembly

Fig.11

Joint d

Removing the headphone jack board

(See Fig.13 and 14)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the system control board and the front panel assembly section.

Disconnect the wire from connector CN804 on the main board.

Remove the plastic rivet fixing the headphone jack board.

Joint d

Fig.12

Main board

CN804

Headphone jack board

Fig.13

Plastic rivet

Headphone jack board

Fig.14

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UX-A52R

Removing the main board / the heat sink

(See Fig.15 to 17)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section and and the system control board.

Disconnect the wire from connector CN804 on the main board.

Remove the five screws H attaching the cassette mechanism bracket.

Remove the screw G attaching the grounding terminal extending from the main board.

Disconnect connector CN805 on the main board from the AC jack board while pulling out it. Remove the main board in the direction of the arrow and disconnect the wire from connector CN803 on the reverse side of the main board.

Remove the three screws I attaching the heat sink on the reverse side of the main board.

Main board

CN804

Cassette mechanism bracket

Fig.15

Main board

CN804

CN805

CN803

Heat sink

Tuner board

Fig.16

Fig.17

Main board

1-10

Removing the AC jack board

(See Fig.18 and 19)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section, the system control board and the main board / the tuner board.

Disconnect the wire from connector CN809 on the AC jack board.

Remove the screw J and screw K attaching the AC jack board.

Power transformer assembly

UX-A52R

AC jack board

CN809

Fig.18

CN809

Removing the power transformer assembly (See Fig.20)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section, the system control board and the main board.

Disconnect the wire from connector CN809 on the AC jack board.

Cut off the band setting the wire on the CD mechanism cover.

Power transformer assembly

Fig.19

AC jack board

CN809

Band

Remove the four screws L attaching the power transformer assembly.

Fig.20

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Removing the CD mechanism assembly

(See Fig.21 to 23)

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section, the system control board, the front panel assembly section, the main board / the tuner board and the AC jack board.

Cut off the band setting the wire on the CD mechanism cover.

Release the wire extending from the headphone jack board from the spacer and the three notches of the CD mechanism cover on the left side of the body.

Remove the four screws M on the left and right side of the CD mechanism cover. Then remove the CD mechanism cover upward.

Remove the three screws N attaching the CD mechanism assembly.

CD mechanism cover

Band

Notches

CD mechanism assembly

Spacer

Notch

Fig.21

CD mechanism cover

Band

Fig.22

CD mechanism assembly

Fig.23

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UX-A52R

Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the system control board and the front panel assembly section.

Removing the relay board (See Fig. 24)

Disconnect the wire from connector CN906, CN907

1. and the card wire from CN908 on the relay board respectively.

Remove the two screws O.

Removing the drive motor assembly

(See Fig.25)

Prior to performing the following procedure, remove the relay board.

CN907

Drive motor assembly

CN908

Fig.24

Door switch board

Relay board

CN906

Remove the four screws P attaching the drive motor assembly.

Removing the belt and the drive motor

(See Fig.26)

REFERENCE:

Remove the two screws Q attaching the plate.

Remove the belt from the two pulleys.

Remove the two screws R attaching the drive motor.

REFERENCE:

The belt and the drive motor can be removed respectively without removing the drive motor assembly from the front panel section.

When removing the drive motor only, remove the belt from the drive motor pulleys in advance.

Fig.25

Belt

Plate

Drive motor

Fig.26

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Removing the door switch board

(See Fig.27 and 28)

Prior to performing the following procedure, remove the relay board.

Loosen the screw S attaching the door switch.

Remove the door switch board while releasing it from the joint e.

CAUTION:

When reattaching the door switch board, fit it to the joint e and check the operating state of the switch before tightening the screw S.

Removing the LCD section

(See Fig.29 to 31)

Prior to performing the following procedure, remove the relay board.

Drive motor assembly

Switch section

Fig.27

Door switch board

Fig.28

Door switch board

Joint e

Loosen the two screws T attaching the lock lever.

Push the part f of the lock lever in the direction of the arrow as shown in Fig.30-1 / 30-2 and disengage the LCD section from the front panel assembly.

CAUTION:

Because the LCD may come off, hold it when loosening the screws T.

Lock lever f Lock lever f

Lock lever

LCD section

Lock lever

Front panel assembly

Fig.29

Front panel assembly

Joint f

1-14

Fig.30-1 Fig.30-2

Joint f

Fig.31

UX-A52R

Removing the LCD board assembly

(See Fig.32 to 36)

Prior to performing the following procedure, remove the relay board and the LCD section.

Remove the four screws U attaching the case cover.

Remove the four screws V attaching the LCD panel on the back of the LCD section.

Remove the LCD cover.

Release the three joints g and remove the LCD board assembly in the direction of the arrow.

Case cover

Fig.32

LCD section

Joint g

Fig.33

LCD panel

Fig.34

Joint g

LCD cover

LCD board assembly

Fig.35 Fig.36

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+ 35 hidden pages

JVC UX-A52R Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Important for laser products

Disassembly method