JVC RC BX30 Service Manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BX30

Area suffix

UJ --------------------- U.S.Military

RC-BX30

Contents

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

1-2 1-3 1-4 1-5 1-14 1-17

Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs Wiring connection

1-18 1-19 1-19 1-20 1-22

No.21171

Dec. 2002

RC-BX30

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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RC-BX30

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

In order to maintain quality during transport and before installation, both sides of the laser diode on the

1. replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

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

2. source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

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

Remove solder of the short land on the flexible wire 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.

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

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

5. Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the CD pickup unit.

Apply solder to the short land before the flexible wire is removed from the CD servo board. (If the flexible wire is disconnected without applying solder, the CD pickup unit may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the fiexible wire.

Short land

Fiexible wire

CD pickup unit

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RC-BX30

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 när 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. Undgåudsættelse for stråling. ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse

for stråling.

REPRODUCTION AND POSITION OF LABELS

CLASS 1

LASER PRODUCT

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RC-BX30

Disassembly method

Removing the handle (See Fig. 1.)

Open the CD door.

Lift the handle slightly.

While pressing the claws a of the rear cabinet

3. assembly in the direction of the arrow 1, slide the handle in the direction of the arrow 2.

Removing the front cabinet assembly

and rear cabinet assembly

(See Figs. 2 to 4.)

Remove the eight screws A retaining the front cabinet and rear cabinet assemblies from the rear of the main body. (See Fig.2.)

Handle

Claw a

CD door

Claw a

Rear cabinet assembly

Fig.1

Open the cassette door. (See Fig.3.)

Slide the lower part of the front cabinet assembly slightly in the direction of the arrow 1. (See Fig.3.)

While removing the front cabinet assembly from the cassette knobs and remove it in the upward direction 2. (See Fig.3.)

Disconnect the speaker wire from the connector CN401 on the main board. (See Fig.4.)

Main board

CN401

Rear cabinet assembly

Front cabinet assembly

Fig.2

Rear cabinet assembly

Front cabinet assembly

Cassette knobs

Fig.3Fig.4

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RC-BX30

Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.

Removing the right and left speaker

assemblies (See Fig. 5.)

From the inside of the front cabinet assembly, remove the six screws B retaining the right and left speaker assemblies.

Remove the solders from the soldered sections b of the right and left speaker assemblies, remove the speaker wires.

Take out the right and left speaker assemblies.

Right speaker assembly

Soldered section b

Front cabinet assembly

Left speaker assembly

Speaker wires

Soldered section b

[Note]

When attaching the screws B, apply a locking agent to the screws B.

Removing the cassette door gear

assembly (See Fig. 6.)

1.2.From the inside of the front cabinet assembly, remove the two screws C retaining the cassette door gear assembly.

Take out the cassette door gear assembly.

[Note]

When attaching the screws C, apply a locking agent to the screws C.

Removing the cassette door

(See Fig. 7.)

Prior to performing the following procedures, remove the cassette door gear assembly.

Section c

Fig.5

Front cabinet assembly

Cassette door gear assembly

Fig.6

1.2.While pressing the section c of the cassette door in the direction of the arrow, remove the boss d of the cassette door from the section e of the front cabinet assembly.

Disengage the boss f of the cassette door from the section g of the front cabinet assembly.

[Note]

1-6

Be sure to hang the spring to the section h before attaching the cassette door to the front cabinet assembly.

Boss d

Section e

Fig.7

Spring

Cassette door

Section h

Section g

Boss f

RC-BX30

Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.

Removing the tuner board

(See Figs. 8 to 10.)

From the rear side of the rear cabinet assembly, remove the screw D retaining the FM antenna.

(See Fig.8.)

Pull out the band and fine tune knobs from the tuner board. (See Fig.9.)

Disconnect the wire from the connector CN101 on the tuner board. (See Fig.9.)

Remove the screw E and two screws F retaining the tuner board. (See Fig.9.)

Take out the tuner board, then remove the screw G retaining the antenna connector plate. (See Fig.10.)

Rear cabinet assembly

CN101

FM antenna

Fig.8

Band knob

Tuner board

Fine tune knob

[Note]

When attaching the screws G, apply a locking agent to the screws G.

Removing the main board

(See Figs. 9 and 11.)

Disconnect the wire from the connector CN101 on the tuner board. (See Fig.9.)

Pull out the volume, DBB and function knobs from the main board. (See Fig.11.)

Disconnect the wires from the connectors CN302, CN303 and CN501 on the main board.

(See Fig.11.)

Remove the solders from the soldered section i connecting the wires to the main board.

(See Fig.11.)

Remove the three screws H retaining the main board. (See Fig.11.)

Rear cabinet assembly

Volume knob

Main board

DBB knob

Fig.9

Fig.10

FM antenna wire

Antenna connector plate

FM antenna wire

Tuner board

Function knob

Rear cabinet assembly

CN302

Soldered section i

CN303

CN501

Fig.11

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RC-BX30

Removing the cassette deck/CD

mechanism assembly

(See Figs.12 and 13.)

From the rear side of the rear cabinet assembly, remove the two screws J retaining the cassette deck/CD mechanism assembly. (See Fig.12.)

Disconnect the wires from the connectors CN302, CN303 and CN501 on the main board.

(See Fig.13.)

Remove the two screws K retaining the cassette deck/CD mechanism assembly. (See Fig.13.)

[Note]

When attaching the screws K, apply a locking agent to the screws K.

Removing the display board

(See Figs.14 and 15.)

From the bottom side of the CD mechanism assembly, remove the tie bands bundling the wires from the CD mechanism assembly. (See Fig.14.)

CN302

CN303

Fig.12

Cassette deck/CD mechanism assembly

Rear cabinet assembly

Disconnect the wires from the connectors BC01, BC02 and BC03 on the CD servo board.

(See Fig.14.)

Remove the solders from the soldered section j connecting the wires to the micro switch board.

(See Fig.14.)

Remove the two screws L retaining the display board. (See Fig.15.)

Press the claws k in the direction of the arrow, remove the display board. (See Fig.15.)

Cassette desk mechanism assembly

Display board

Claws k

CN501

Rear cabinet assembly

Fig.13

BC03Tie bands

Tie band

CD mechanism assembly

Micro switch board

1-8

Soldered section j

BC01

BC02

Fig.14Fig.15

CD servo board

+ 16 hidden pages

JVC RC BX30 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Important for laser products

Disassembly method