JVC RC BZ6LB Service Manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BZ5LB/BZ5RD

RC-BZ6BU

RC-BZ5LB/BZ5RD

RC-BZ6BU

REMOTE CONTROL RM-SRCBZ5

RC-BZ5LB/BZ5RD

REMOTE CONTROL RM-SRCBZ6

RC-BZ6BU

Contents

Safety precautions Importance administering point on the safety Preventing static electricity Important for laser products Disassembly method Adjustment method Description of major ICs

1-2 1-3 1-4 1-5 1-6 1-15 1-18

Areas suffix

J ---------------- U.S.A.

C ------------- Canada

Comparison table

Item Jog dial circuit Not used Used Back light (LCD) Not used Used Bass boost circuit Not used Used Power amplifier 14W 18W Electrical volume Not used Used

RC-BZ5LB/BZ5RD

RC-BZ6BU

No.20819

July. 2000

RC-BZ5LB/BZ5RD RC-BZ6BU

Safety precautions

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 alter ations 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 current check (Electrical shock hazard testing) After re-assembling the product, always perfor m 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, par ticularly any exposed metal part having a return path to the chassis, and measure 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.

1-2

CAUTION

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.

Importance administering point on the safety

Power supply board

D902

D903

R998

CN307CN306

F903

D901

D904

F902

POWER TRANSFORMER

RC-BZ5LB/BZ5RD

RC-BZ6BU

F901

Not used

S901

For USA and Canada / pour Etats - Unis d' Amerique et Canada

Caution: For continued protection against risk of fire, replace only with same type 3A/125V for F902 and F903. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F902 et F903 comme le meme type que 3A/125V. Ce sont des fusibles suretes qui functionnes rapide.

1-3

RC-BZ5LB/BZ5RD RC-BZ6BU

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. Remove solder of the land on the flexible cable 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

CD Pick up

Attention when traverse unit is decomposed

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

1.Short the land before the card wire is removed from connector on the Main board 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

Land

Important for laser products

RC-BZ5LB/BZ5RD

RC-BZ6BU

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.

CAUTION

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

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1 LASER PRODUCT

1-5

RC-BZ5LB/BZ5RD RC-BZ6BU

Disassembly method

Removing the front cabinet assembly /

rear cabinet assembly (See Fig.1 to 3)

Detach the battery cover on the back of the body. Remove the eight screws A attaching the front cabinet assembly and the rear cabinet assembly.

Press STOP / EJECT button on the upper side of the body to open the cassette door.

Remove the front cabinet assembly toward the front and pull out the volume knob at the same time.

Disconnect the speaker harness from connector CN309 on the main board in the rear cabinet assembly.

Front cabinet assembly

Battery cover

Fig.1

Rear cabinet assembly

STOP / EJECT button

assembly /

Cassette door

Volume knob

Fig.2

Rear cabinet assembly

1-6

Main board

CN309

Front cabinet assembly

Fig.3

RC-BZ5LB/BZ5RD

RC-BZ6BU

Removing the speaker (L) and (R)

(See Fig.4)

Prior to performing the following procedure, remove the front cabinet assembly.

Remove the eight screws B in the front cabinet.

Removing the cassette door

(See Fig.5 and 6)

Prior to performing the following procedure, remove the front cabinet assembly.

Remove the door spring in the front cabinet assembly.

Insert a screwdriver between the door arm and the front cabinet and slide the door arms inward, then detach the cassette door from the front cabinet.

Speaker (L)

Speaker (R)

Fig.4

Door arms

Reattaching the door spring

Reattach the door spring to the cassette door shaft with opening the cassette door.

Fit another end of the door spring to the front cabinet rib.

Fit the shorter end of the door spring to the cassette door.

Screwdriver

Fig.5

Shaft

Door spring

Fig.6

1-7

RC-BZ5LB/BZ5RD RC-BZ6BU

Removing the CD / cassette and amplifier assembly from the rear cabinet

(See Fig.7 and 8)

Prior to performing the following procedure, remove the front cabinet assembly and the rear cabinet assembly.

For the harness connecting the amplifier board with the power board, disconnect it from connector CN306 on the power board in the right rear cabinet assembly. For the harness connecting the battery terminal wire with the power board, disconnect it from CN307 on the power board.

Remove the two screws C on the bottom of the cassette mechanism unit.

Release the harnesses from the slot a, b and c and the notch of the main board in the rear cabinet.

Remove the CD / cassette and amplifier assembly from the rear cabinet.

CD / cassette and amplifier assembly

Slot a

Release the hornese

CD / cassette and amplifier assembly

Slot c

Fig.7

Power board

CN307

CN306

Now the CD / cassette and amplifier assembly is ready to conduct burn-in.

Slot b

Fig.8

CD door eject button

1-8

Key switch / display board

CN704

Fig.9

+ 17 hidden pages