JVC NX-CDR7R Manual de usuario

COMPACT COMPONENT CDR SYSTEM

NX-CDR7R

Area suffix

B ------------------------------- U.K.

E ----------- Continental Europe

EN ------------ Northern Europe

No.21030

Oct. 2001

CA-NXCDR7R

SP-NXCDR7 SP-NXCDR7

Contents

Safety Precautions

Preventing static electricity

Important for laser products

Disassembly method

Adjustment method

Confirm method of operation

Flow of functional operation until

TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-2

1-3

1-4

1-5

1-29

1-30

1-32

1-33

1-34~50

SERVICE MANUAL

NX-CDR7R

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.

When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.

(Except the J and C version)

NX-CDR7R

1-3

Preventing 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.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.

Be careful to use proper grounding in the area where repairs are being performed.

1.1.1. Ground the workbench

1. 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.

1.1.2. Ground yourself

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

1.1.3. 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 next page.)

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.

1.2. 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. For specific details, refer to the replacement procedure in the text.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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

NX-CDR7R

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 är 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. 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

CAUTION

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

CLASS 1

LASER PRODUCT

NX-CDR7R

1-5

Remove the four screws Aon the back of the body.

Remove the screw Bon each side of the body.

Remove the rear part of the metal cover upward

while pulling the lower part of both sides.

Disassembly method

Removing the metal cover

(See Fig.1 and 2)

Fig.1

Fig.2

B 2

Metal cover

B 2

NX-CDR7R

1-6

Prior to performing the following procedure, remove

the metal cover.

Disconnect the card wire from connector CN705,

CN708, CN704 and CN712 on the main board.

Disconnect the wire from connector CN905 on the

power board.

Remove the two screws Con each side of the body.

Remove the two screws Don the bottom of the

body.

Disengage the joint aon the bottom and the two

joints bon the lower side of the body using a

screwdriver. Then remove the front panel assembly

toward the front.

Removing the front panel assembly

(See Fig.3 to 6)

Fig.3

Fig.4

Fig.5Fig.6

Front panel assemblyCN704 CN712

CN705

CN708

Main board

Power board

CN905

Main board

Front panel assembly

Joint b

CN705

Main board

CN708

Joint b

Front panel assembly

Joint a

NX-CDR7R

1-7

Prior to performing the following procedure, remove

the metal cover.

Disconnect the card wire from connector CN704,

CN705, CN706, CN707, CN708, CN709 and CN712

on the main board on the upper side of body.

Remove the two screws Eon the upper side of the

body.

Disconnect connector CN701, CN702, CN703,

CN710, CN711 on the main board from other boards

respectively.

Removing the main board

(See Fig.7 and 8)

Fig.7

Fig.8

CN711

CN704

CN708

Main board

Front panel assembly

CN705

CN710

CN709

CN712

CN702

CN703

CN701

CN707

CN706

EMain board

CN711

CN710

CN702

CN703

CN701

Front panel assembly

CN706

CN707

NX-CDR7R

1-8

Prior to performing the following procedure, remove

the metal cover.

Remove the four screws Fon the back of the body,

and press the two joints cinward to release.

Remove the thirteen screws Gattaching the rear

panel.

Disengage the two joints din the lower part of the

rear panel using a screwdriver.

Removing the rear cover / rear panel

(See Fig.9 to 12)

Fig.9

Fig.10

Fig.11Fig.12

Joint c

Rear cover

Rear panel

Joint d

Rear panel

Joint d

NX-CDR7R

1-9

Prior to performing the following procedure, remove

the metal cover, the main board and the rear panel.

Disconnect the wire from connector CN802 on the

tuner board on the right side of the body.

Remove the screw Hattaching the tuner board.

Move the tuner board upward and outward to

disengage the tuner board from the base chassis at

the joint f, and from the power board at the joint e.

Removing the tuner board (See Fig.13)

Prior to performing the following procedure, remove

the metal cover, the main board and the rear panel.

Remove the band attaching the wire to the power

board on the back of the body.

Disconnect the wire from connector CN901, CN904

and CN905 on the power board.

Remove the screw Ion the left side of the body.

Disconnect connector CN902 and CN903 on the

power board from the power board, and move the

power board upward to disengage it from the base

chassis at the joint g.

Removing the power board

(See Fig.14 and 15)

Fig.13

Fig.14

Fig.15

Joint f

Joint e

Tuner board

CN802

Power board

Tuner board

Band

CN904

CN901

Power board

CN903

CN905 CN902

Band

CN904

CN901

IJoint g

NX-CDR7R

1-10

Prior to performing the following procedure, remove

the metal cover, the main board, the rear panel and

the tuner board.

Disconnect the wire from connector CN403 on the

power amplifier board 2.

As the wire extending from the fan, take it off the notch

hin the lower part of the power amplifier board 2.

Disconnect connector CN101 and CN103 on the

power amplifier board 1, and CN402 and CN405 on

the power amplifier board 2 from the power board

respectively. The heat sink is still attached to the

power amplifier board 1 and the power amplifier

board 2.

Remove the two screws Jattaching the IC bracket

(1) on the back of the heat sink, and remove the

power amplifier 1.

Remove the three screws Kattaching the IC bracket

(2) on the back of the heat sink, and remove the

power amplifier 2.

Removing the power amplifier board 1 /

power amplifier board 2 / heat sink

(See Fig.16 to 19)

Fig.16

Fig.17

Fig.18Fig.19

Notch h

Power amplifier board 2

CN403

Power amplifier board 1

CN101 Power board

CN402

Power amplifier board 2

CN405

CN103

Heat sink

Power amplifier board 2

Heat sink

Power amplifier board 2

Power amplifier board 1

Heat sink

IC bracket (1)

Power amplifier board 2 Power amplifier board 1

Heat sink

IC bracket (2)

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