JVC RC BX30 Service Manual

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RC-BX30

No.21171

Dec. 2002

SERVICE MANUAL

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

RC-BX30

Area suffix

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

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

1-20

1-22

CD PORTABLE SYSTEM

RC-BX30

1-2

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.).

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.

Good earth ground

Place this

probe on

each exposed

metal part.

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

1500 10W

0.15 F AC TYPE

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.)

RC-BX30

1-3

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Short land

Fiexible wire

CD pickup unit

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.

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.

Preventing static electricity

1. Grounding to prevent damage 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. About the earth processing for the destruction prevention by static electricity

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.

2-1 Ground the workbench

2-2 Ground yourself

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

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.)

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.

3. Handling the 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.

4. Handling the traverse unit (optical pickup)

RC-BX30

1-4

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.

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.

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.

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

CAUTION

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

RC-BX30

1-5

Fig.1

Fig.2

Fig.3Fig.4

Removing the front cabinet assembly

and rear cabinet assembly

(See Figs. 2 to 4.)

Disassembly method

Removing the handle (See Fig. 1.)

Remove the eight screws A retaining the front

cabinet and rear cabinet assemblies from the rear

of the main body. (See Fig.2.)

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.)

Open the CD door.

Lift the handle slightly.

While pressing the claws a of the rear cabinet

assembly in the direction of the arrow 1, slide the

handle in the direction of the arrow 2.

CD door

Rear cabinet assembly

Handle

Claw a

Rear cabinet assembly

Cassette knobs

Rear cabinet assembly

Front cabinet assembly

Rear cabinet assembly

Front cabinet assembly

Main board

CN401

RC-BX30

1-6

Fig.5

Fig.6

Fig.7

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.

Removing the cassette door gear

assembly (See Fig. 6.)

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.

[Note]

When attaching the screws B, apply a

locking agent to the screws B.

Removing the cassette door

(See Fig. 7.)

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.

Prior to performing the following procedures,

remove the cassette door gear assembly.

[Note]

Be sure to hang the spring to the

section h before attaching the cassette

door to the front cabinet assembly.

Front cabinet assembly

Cassette door gear assembly

Cassette door

Section e

Section c

Boss d

Boss f

Section g

Section h

Spring

Front cabinet assembly

Right speaker

assembly

Left speaker assembly

Soldered section b

Speaker wires

RC-BX30

1-7

Fig.10

Fig.11

Fig.8

Fig.9

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.)

Prior to performing the following procedures,

remove the front cabinet assembly from the rear

cabinet assembly.

[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

Rear cabinet

assembly

Rear cabinet

assembly

Rear cabinet

assembly

Main board

Volume knob

DBB knob

CN302

CN303

CN501

Function knob

Soldered section i

FM antenna

Tuner board

Antenna connector plate

Fine tune knob

Band knob

CN101

FM antenna wire

RC-BX30

1-8

Fig.12

Fig.13

Fig.14Fig.15

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.)

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 deck/CD

mechanism assembly

Rear cabinet assembly

BC01

BC02

BC03Tie bands

CD mechanism

assembly

Cassette desk

mechanism assembly

Tie band

Display board

Claws k

CD servo board

Soldered

section j

Micro switch

board

CN302

CN303

CN501

Cassette deck/CD mechanism assembly

+ 16 hidden pages