JVC NX-DV3 Service Manual

SERVICE MANUAL

COMPACT COMPONENT MD SYSTEM

MB35120052

NX-DV3

Area suffix

UB -------------------- Hong Kong UJ --------------------- U.S.Military

(SP-NXDV3S)

(CA-NXDV3)

(SP-NXDV3S)

(SP-NXDV3S)(SP-NXDV3S)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41

No.MB351

2005/2

SPECIFICATION

MD/DVD receiver (CA-NXDV3)

Amplifier Output power Front 30 W + 30 W at 4 Ω (10% THD)

Surround 30 W + 30 W at 4 Ω (10% THD)

Input terminals Analog AUX×1, 500 mV/47 kΩ

Digital Digital optical input × 2

-23 dBm to -15 dBm (Optical square terminal) (Compatible with frequency of 32 kHz 44.1 kHz and 48 kHz)

Output terminals Analog Front speaker×2

Impedance 4 Ω - 16 Ω Surround speaker×2 Impedance 4 Ω - 16 Ω Headphone (×1) Impedance 16 Ω - 1 kΩ Sub woofer×1

Digital DVD/CD optical output × 1

-23 dBm to -15 dBm (Optical square terminal)

1.1 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 alterations of the product should not be made. Any design alterations or additions will void the manufacturers 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 reassembling.

(5) Leakage shock hazard testing

After reassembling 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 in the following manner. Connect a 1,500 paralleled by a 0.15 exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC

Ω per volt or more sensitivity

Ω 10W resistor

µF AC-type capacitor between an

voltmeter. Move the resistor connection to each exposed metal part, particularly 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.).

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

0.15 F AC TYPE

Place this probe on

1500 10W

Good earth ground

1.2 Warning

(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.

1.3 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.

1.4 Critical parts for safety

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. (This regulation dose not Except the J and C version)

each exposed metal part.

1-4 (No.MB351)

1.5 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.

1.5.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed.

(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) 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 palate

(3) Handling the optical pickup

• 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.

1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 Attention when traverse unit is decomposed

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

• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.

Short land section

Pickup

Card wireTraverse mechanism assembly

(No.MB351)1-5

1.8 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 CD,MD and DVD player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. 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 here in may result in hazardous radiation exposure.

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

CAUTION : Visible and Invisible

laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

CLASS 1 LASER PRODUCT

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

1-6 (No.MB351)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB351)1-7

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the metal cover (See Figs.1 to 3)

(1) From the both sides of the main body, remove the four

screws A attaching the metal cover. (See Figs.1 and 2)

(2) From the back side of the main body, remove the two

screws B attaching the metal cover to the rear cover. (See Fig.3)

(3) Take out the metal cover.

3.1.2 Removing the rear panel (See Fig.4)

• Prior to performing the following procedure, remove the metal

cover. (1) From the back side of the main body, remove the thirteen

screws C and screw D attaching the rear panel.

(2) Release the two joints a, and take out the rear panel.

Metal cover

Metal cove

Fig.1

Fig.2

Metal cover

Fig.3

1-8 (No.MB351)

Joint aJoint a Rear panel

Fig.4

3.1.3 Removing the front panel assembly

(See Figs.5 and 6)

• Prior to performing the following procedure, remove the metal

cover. (1) From the top side of the main body, disconnect the card

wire from the connector CN703 on the micon board. (See Fig.5)

(2) From the bottom side of the main body, remove the three

screws E attaching the front panel assembly. (See Fig.6)

(3) Release the joints b and c attaching the front panel assem-

bly. (See Fig.6)

(4) Take out the front panel assembly from the main body for-

ward.

Headphone board

CN401

Front panel assembly

CN221

CN791

CN703

3.1.4 Removing the tuner

(See Figs.5 and 7)

• Prior to performing the following procedure, remove the metal

cover. (1) From the top side of the main body, disconnect the card

wire from the connector CN761 on the micon board. (See Fig.5)

(2) From the back side of the main body, remove the two

screws F attaching the tuner to the rear panel. (See Fig.7)

(3) Take out the tuner from the main body.

3.1.5 Removing the micon board

(See Figs.5 and 7)

• Prior to performing the following procedure, remove the metal

cover.

Reference:

Remove the rear panel as required. (Refer to 3.1.2 "Removing the rear panel") (1) From the back side of the main body, remove the five

screws G attaching the micon board. (See Fig.7)

(2) From the top side of the main body, remove the four screws

H attaching the micon board. (See Fig.5)

(3) Disconnect the parallel wire from the connector CN401 on

the headphone board. (See Fig.5)

(4) Disconnect the card wires from the connectors (CN211,

CN212, CN221, CN701, CN702, CN703 and CN761) on the micon board. (See Fig.5)

(5) Disconnect the parallel wires from the connectors (CN201,

CN222, CN231 and CN751) on the micon board. (See Fig.5)

(6) Take out the micon board.

CN222

CN201

CN751

Ground point

Micon board

Earth wire

Fig.5

Fig.6

CN761

CN211

CN212

CN231

CN701

CN702

Tuner

Joint cJoint bJoint c

Rear panel

Fig.7

(No.MB351)1-9

3.1.6 Removing the main board (See Fig.8)

• Prior to performing the following procedures, remove the metal

cover, tuner and micon board. (1) From the top side of the main body, remove the screw J

and screw K attaching the main board.

(2) Disconnect the card wires from the connectors (CN603 and

CN604) on the main board.

(3) Disconnect the parallel wires from the connectors (CN605

and CN606) on the main board.

Reference:

When attaching the main board, align the slot of it with the projection d of the main body.

Projection d

CN604

CN605

Main boardCN603

CN606

Fig.8

1-10 (No.MB351)

3.1.7 Removing the speaker terminal board

(See Fig.9)

• Prior to performing the following procedures, remove the metal

cover, tuner, micon board and main board. (1) From the top side of the main body, remove the screw L at-

taching the speaker terminal board.

(2) Disconnect parallel wire from the connector CN381 on the

speaker terminal board.

(3) Take out the speaker terminal board.

Reference:

After attaching the speaker terminal, fix the parallel wire with the wire clamp as before.

3.1.8 Removing the amplifier board

(See Figs.9 to 12)

• Prior to performing the following procedures, remove the metal

cover, tuner, micon board and main board. (1) From the top side of the main body, remove the two screws

M and two screws N attaching the amplifier assembly. (See Fig.9)

(2) Disconnect the parallel wire from the connector CN381 on

the speaker terminal board, and take out amplifier assembly. (See Fig.9)

(3) From the bottom side of the amplifier assembly, remove

the rubber sheet. (See Fig.10)

(4) Remove the screw P attaching the heat sink, and take out

the heat sink. (See Fig.10)

Caution:

After attaching the heat sink, put the rubber sheet on the heat sink as before.

(5) From the both sides of the amplifier assembly, release the

joints e, and take out the amplifier board. (See Figs.10 and

11)

Reference:

After attaching the amplifier assembly, fix the parallel wire with the wire clamp as before.

Earth wire

Wire clamp

Fig.9

Amplifier assembly

Speaker terminal board

Amplifier assembly

CN381

Heat sink

mplifier board

Rubber sheet

Fig.10

Joint e Amplifier board

Fig.11

Joint e

Fig.12

(No.MB351)1-11

3.1.9 Removing the fan motor (See Fig.13)

• Prior to performing the following procedures, remove the metal

cover, rear panel, tuner and micon board.

Reference:

Remove the main board as required. (Refer to 3.1.6 "Removing the main board") (1) From the top side of the main body, remove the screw Q

attaching the fan motor.

(2) Remove the tape attaching the fan wire to the SW power

unit.

(3) Take out the fan motor.

Reference:

• When attaching the screw Q, attach it with the wire clamp.

• After attaching the fan motor, fix the fan wire with the new tape.

3.1.10 Removing the SW power unit (See Fig.13)

• Prior to performing the following procedures, remove the metal

cover, rear panel, tuner and micon board. (1) From the top side of the main body, remove the screw R at-

taching the SW power unit.

(2) Remove the tape attaching the fan wire to the SW power

unit.

(3) Take out the SW power unit.

Reference:

After attaching the fan motor, fix the fan wire with the new tape.

SW power unit Wire clamp

Fan wire Fan motor

Fig.13

1-12 (No.MB351)

3.1.11 Removing the DVD mechanism assembly

(See Fig.14)

• Prior to performing the following procedures, remove the metal

cover, front panel assembly and micon board. (1) From the top side of the main body, disconnect the card

wires from the connectors (CN603 and CN604) on the main board.

(2) Disconnect the card wire from the connector CN291 on the

holder board.

(3) Remove the three screws S attaching the DVD mechanism

assembly.

(4) Take out the DVD mechanism assembly.

3.1.12 Removing the MD mechanism assembly

(See Figs.14 to 16)

• Prior to performing the following procedures, remove the metal

cover, front panel assembly and micon board. (1) From the top side of the main body, disconnect the card

wire from the connector CN291 on the holder board. (See Fig.14)

(2) Remove the two screws T attaching the MD mechanism

assembly, and take out the MD mechanism assembly with MD bracket. (See Fig.14)

(3) From the left side of the MD mechanism assembly, remove

the two screws U attaching the MD bracket L to the MD mechanism assembly. (See Fig.15)

(4) From the right side of the MD mechanism assembly, re-

move the two screws V attaching the MD bracket R to the MD mechanism assembly. (See Fig.16)

Reference:

When attaching the MD mechanism assembly, align it with the slot f and slot g of the main body. (See Fig.14)

MD mechanism assembly

Slot f

DVD mechanism assembly

Slot g

Main boardCN291 CN603

CN604Holder board

Fig.14

3.1.13 Removing the holder board

(See Fig.15)

• Prior to performing the following procedures, remove the metal

cover, front panel assembly, micon board and MD mechanism assembly. (1) From the left side of the MD mechanism assembly, remove

the screw W attaching the holder board to the MD bracket L.

(2) Disconnect the card wire from the connector CN292 on the

holder board.

(3) Take out the holder board.

3.1.14 Removing the headphone board

(See Fig.16)

• Prior to performing the following procedures, remove the metal

cover, front panel assembly, micon board and MD mechanism assembly. (1) From the right side of the MD mechanism assembly, re-

move the screw X attaching the headphone board to the MD bracket R.

(2) Take out the headphone board.

CN292

W U

Holder board MD bracket L

Fig.15

X V

Headphone board MD bracket R

Fig.16

(No.MB351)1-13

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