JVC UX-L30, UX-L40 Service Manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-L40/UX-L30

BASS

SET

CD TAPE

REV.MODEFM MODE

PRGM RANDOM REPEAT

RM-SUXL40U REMOTE CONTROL

DOWN

SURROUNDAHB PRO

STANDBY / ON

COMPACT

DIGITAL AUDIO

STANDBY/ON

DISPLAY

CLOCK /TIMER

SLEEP

TREBLE

CANCEL

FM/AM

AUX/MD

AUTO PRESET

DIMMER

VOLUME

PHONES

SP-UXL40 SP-UXL40CA-UXL40

CD-R/RW PLAYBACK

REC SURROND AHB PRO

CLOCK/TIMER AUX/MD

MICRO COMPONENT SYSTEM UX-L40

VOLUME

+–

CD TAPE

FM/AM

DOWN

BASS TREBLE

AUTO REVERSE

STANDBY/ON

DISPLAY

CLOCK

PUSH OPEN

BASS

SET

DOWN

CD/TAPE FM/AM AUX/MD

REV.MODEFM MODE

PRGM RANDOM REPEAT

RM-SUXL30U REMOTE CONTROL

/TIMER

+10

SLEEP

TREBLE

CANCEL

AUTO PRESET

AHB PRO

DIMMER

VOLUME

SP-UXL30 SP-UXL30CA-UXL30

UX-L40

Area Suffix

US ----------------- Singapore UP ----------------------- Korea UW ------- Brazil,Mexico,Peru

STANDBY / ON

COMPACT

DIGITAL AUDIO

PHONES

CD-R/RW PLAYBACK

REC REV. MODE AHB PRO

CLOCK/TIMER AUX/MD

MICRO COMPONENT SYSTEM UX-L30

VOLUME

+–

CD TAPE

FM/AM

DOWN

BASS TREBLE

AUTO REVERSE

PUSH OPEN

UX-L30

Area Suffix

US ----------------- Singapore UP ----------------------- Korea UW ------- Brazil,Mexico,Peru UJ -------------------- U.S.Military

Contents

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

1-2 1-3 1-4 1-5 1-19

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

1-24 1-25 1-25 1-26~35

No.21105

Jul. 2002

1-1

UX-L40/UX-L30

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.)

1-2

UX-L40/UX-L30

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.

Flexible wire

Shorting round

CN601 on mechanism board

1-3

UX-L40/UX-L30

Important for laser products

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

1-4

Disassembly method

Removing the Metal cover (See Fig.1 to 3)

UX-L40/UX-L30

Remove the six screws A on the back of the main body.

Remove the screw B on each side and remove the cover in the direction of the arrow.

Fig.1

Fig.2Fig.3

1-5

UX-L40/UX-L30

Removing the Rear cover (See Fig.4)

Remove the metal cover.

Remove the two screws C retaining the rear cover.

Removing the Rear panel (See Fig.5)

Remove the metal cover and the rear cover.

Fig.4

Remove the twelve screws D retaining the rear panel. Release the two joints a on the rear side and the joint b on each side.

Fig.5

1-6

Removing the Tuner board

(See Fig.6)

Remove the metal cover.

Disconnect the card wire from connector CN1 on the tuner board.

UX-L40/UX-L30

Remove the two screws E on the rear side and the screw F on the side.

Removing the Optical digital board (See Fig.7)

Remove the metal cover.

CN1

Tuner board

Fig.6

Optical digital board

Disconnect the shield wire from connector CN905 on the optical digital board.

Remove the screw G on the rear side and the screw H on the upper side.

CN905

Fig.7

1-7

UX-L40/UX-L30

Removing the CD-R/RW mechanism assembly (See Fig.8)

Remove the metal cover, the rear cover, the rear panel, the tuner board and the optical digital board.

Disconnect the card wire from connector CN903 and CN904 on the main board.

Pull the joint c in the direction of the arrow and remove the CD-R/RW mechanism assembly backward while releasing the joint d.

CD-R/RW mechanism assembly

CN903

CN904

Fig.8

Main board

1-8

UX-L40/UX-L30

Removing the Main board/ the Heat sink board (See Fig.9 to 11)

Remove the metal cover, the rear cover and the rear panel.

Disconnect the card wire from connector CN902, CN903, CN904 and CN905 on the main board and remove the CD-R/RW mechanism assembly.

REFERENCE:

Remove the two screws I to remove the main board.

Disconnect the card wire from connector CN931, CN935, CN933, CN934, CN913, CN901, CN900 and CN917 on the main board.

Remove the band f and disconnect the card wire from connector CN951 on the power transformer assembly. Remove the main board / the heat sink board from the body.

Refer to the method of removing the CD-R/RW mechanism assembly and Fig.8.

CD-R/RW mechanism assembly

CN905

CN902 CN904

CN903

CN915

CN916

Main board

Fig.9

Release the joint e of the main board and disconnect connector CN944 and CN945 of the heat sink board from connector CN915 and CN916 of the main board respectively.

Main board

Heat sink board

CN944

CN945

CN933

CN934

CN913

CN901

CN931

CN935

CN951

Main board

Heat sink board

CN900

CN917

Power transformer assembly

Fig.10Fig.11

1-9

UX-L40/UX-L30

Removing the Power transformer assembly (See Fig.12)

Remove the metal cover, the rear cover, the rear panel, the CD-R/RW mechanism assembly and the main board.

Disconnect the power cord from connector J1000 on

1. the power transformer assembly.

Remove the four screws J.

J1000 Power transformer assembly

Fig.12

1-10

UX-L40/UX-L30

Removing the Front panel assembly (See Fig.13 to 16)

Remove the metal cover.

Remove the screw K on each side. Pull the joint h

1. on both sides and lift the front panel assembly to release the joint g.

Disconnect connector CN931, CN935, CN933 and

2. CN934 on the main board.

Disconnect the card wire from connector CN33 and

3. CN34 on the cassette mechanism board.

Front panel assembly

Main board

Fig.13

Front panel assembly

CN34 CN33

CN935 CN931

Fig.14

CN933 CN934

Cassette mechanism assembly

Cassette mechanism board

Fig.15Fig.16

1-11

+ 25 hidden pages