Jvc XV-N452, XV-N450 Service Manual

SERVICE MANUAL

YD11820075SERVICE MANUAL

XV-N450BUC, XV-N452SUC,

DVD PLAYER

XV-N452SUM

Area Suffix

UC -------------- Canada UM ------ Latin America

DISPLAY

XV-N450BUC,XV-N452SUC,XV-N452SUM [D7P2]

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

No.YD118

2007/6

SPECIFICATION

XV-N450BUC, XV-N452SUC, XV-N452SUM

General

Power requirements AC120 V, 60 Hz

Power consumption 8 W

Dimensions (Approx.) 430 × 35 × 201 mm (17 × 1.4 × 7.9 inches) (W × H × D) without foot

Net weight (Approx.) 1.6 kg (3.5 lbs)

Operating temperature 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity 5 % to 90 %

Outputs

VIDEO OUT 1.0 V (p-p), 75 Ω, sync negative, RCA jack × 1 S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω,negative sync, Mini DIN 4-pin × 1

COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω,negative sync, RCA jack × 1,

(Pb)/(Pr) 0.7 V (p-p),75 Ω, RCA jack x 2

AUDIO OUT 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) × 1 DIGITAL OUT (COAXIAL) 0.5 V (p-p), 75 Ω, RCA jack × 1

System

Laser

Signal system

Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz

Signal-to-noise ratio More than 90 dB (ANALOG OUT connectors only)

Harmonic distortion Less than 0.02%

Dynamic range More than 95 dB (DVD/CD)

Accessories

Video cable (1), Audio cable (1), Remote control (1), Batteries (2)

Note:

Design and specifications are subject to change without prior notice.

Semiconductor laser, wavelength 650 nm

NTSC

DVD (PCM 48 kHz): 8 Hz to 22 kHz CD: 8 Hz to 20 kHz

1-2 (No.YD118)

SECTION 1

PRECAUTION

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 ohms per volt or more sensitivity in the following manner. Connect a 1,500 ohm 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 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. (Except the JC version)

each exposed metal part.

(No.YD118)1-3

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 DVD players. 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 Precautions of the safe use of battery

• Store the battery in a place where children cannot reach.If a child accidentally swallows the battery, consult a doctorimmediately.

• Do not recharge, short, disassemble or heat the battery or dispose of it in a fire. Doing any of these things may cause the battery to give off heat, crack, or start a fire.

• Do not leave the battery with other metallic materials.Doing this may cause the battery to give off heat, crack, or start a fire.

• When throwing away or saving the battery, wrap it in tape and insulate; otherwise, the battery may start to give off heat, crack, or start a fire.

• Do not poke the battery with tweezers or similar tools.Doing this may cause the battery to give off heat, crack, or start a fire.

• Dispose of batteries in the proper manner, according to federal, state, and local regulations.

1-4 (No.YD118)

1.8 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION : VISIBLE AND/OR INVISIBLE CLASS 1M

LASER RADIATION WHEN OPEN.

DO NOT STARE INTO BEAM OR VIEW DIRECTLY WITH

OPTICAL INSTRUMENTS.

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 laser products uses visible and / or

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.

CAUTION : VISIBLE AND/OR INVISIBLE CLASS 1M

LASER RADIATION WHEN OPEN.

DO NOT STARE INTO BEAM OR VIEW

DIRECTLY WITH OPTICAL INSTRUMENTS.

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.

(No.YD118)1-5

SPECIFIC SERVICE INSTRUCTIONS

2.1 SERVICE INFORMATION FOR EEPROM

POWER ON

SECTION 2

DVD LOGO Status (NO Disk status)

Remotecontrol Pause key-->1-->4-->7-->2 in order.

Press number 0~8, Press charater A~F (1~6 for a while)

Use arrow key (F D G E) to move to approprite position and make changes

Press pause key once

DETECT NEW EEPROM (OPTION EDIT SCREEN)

MODEL : XV-N450B/XV-N452S NAME HEX

OPT 1 00 OPT 2 00 OPT 3 00 OPT 4 00 OPT 5 00 OPT 6 00 OPT 7 00 OPT 8 00

Change will be applied when power

OFF-->ON.

1-6 (No.YD118)

SECTION 3

TOP COVER

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the top cover (See figure 1)

(1) Remove the two screws A attaching the top cover on both

sides of the main body.

(2) Remove the three screws B attaching the top cover on the

back of the main body.

(3) Raise the both sides and lower part of the rear of the top

cover, with opening them slightly in an outward direction. And the top cover will be removed.

TOP COVER

3.1.3 Removing the mechanism assembly (See figure 4)

• Prior to performing the following procedure, remove the top cover and front panel assembly. (1) Disconnect the card wire from connectors P2201

on the main board.

P2202

(2) Remove the four screws C attaching the mechanism as-

sembly.

Mechanism assembly

Main board

and

P2201

A x 2

Fig.1

3.1.2 Removing the front panel assembly (See figure 2, figure 3)

• Prior to performing the following procedure, remove the top

cover. (1) Disconnect the card wire from connector P6901

main board.

(2) Remove the eight hooks a, and then remove the front panel

assembly.

Main board

Hook a

Front panel assembly

Hook a

Fig.2

Hook a

P6901

on the

Hook a

P2202

Fig.4

3.1.4 Removing the regulator board and main board (See figure 5)

• Prior to performing the following procedure, remove the top

cover. (1) Disconnect the wire from connector PW6101

board.

(2) Disconnect the power cord from connector PW101 on the

regulator board. (3) Remove the four screws D attaching the regulator board. (4) Disconnect the card wire from connectors P2201

and P6901 (5) Remove the two screws E attaching the main board. (6) Remove the two screws F attaching the main board with

rear panel.

on the main board.

PW6101

P6901

on the main

, P2202,

P2202

Front panel assembly

Hook a

Fig.3

PW101

Regulator board

Fig.5

Main board

P2201

(No.YD118)1-7

3.2 DVD MECHANISM PARTS LOCATION

• TOP VIEW (WITH TRAY)

• TOP VIEW (WITHOUT TRAY)

Procedure

Starting No.

1 Main Base 4-1

1, 2 3 Plate Clamp 4-1

1, 2, 3 4 Magnet Clamp 4-1

1, 2, 3, 4 5 Clamp Upper 4-1

16Tray Disc 4-2

1, 6 7

1, 2, 6 8 Gear Feed

1, 2, 6, 8 9 Gear Middle

1, 2, 6, 8,9 10 Gear Rack 1 Screw 4-3

1, 2, 7 11 Rubber Rear 4-3

1, 2, 7 12

1, 2 13 Belt Loading 1 Locking Tab 4-4

1, 2 ,13 14 Gear Pulley 4-4

1, 2, 13, 14 15 Gear Loading 1 Locking Tab 4-4

1, 2, 7, 12, 13, 14

1, 2, 13 17

1,2,7,12,13, 14,15,16,17

16 Guide Up/Down 4-4

18 Base Main 2 Locking Tabs 4-4

Parts Fixing Type

Clamp Assembly Disc

Base Assembly Sled

4 Screws, 1 Connector 1 Locking Tabs

Frame Assembly Up/Down

PWB Assembly Loading

1 Screw Bottom 4-4

1 Locking Tab 1 Hook 2 Screw

Disass

embly

Bottom 4-4

Fig-

ure

4-1

4-3

• BOTTOM VIEW

Note

When reassembling, perform the procedure in reverse order. The “Bottom” on Disassembly column of above Table indicates the part should be disassembled at the Bottom side.

1-8 (No.YD118)

3.3 DVD MECHANISM DISASSEMBLY

Fig.4-1

3.3.1 MAIN BASE (FIG. 4-1)

3.3.1.1 Clamp Assembly Disc

(1) Place the Clamp Assembly Disc as Fig. (A) (2) Lift up the Clamp Assembly Disc in direction of arrow(A). (3) Separate the Clamp Assembly Disc from the Holder

Clamp.

3.3.1.1.1 Plate Clamp

(1) Turn the Plate Clamp to counterclockwise direction and

then lift up the Plate Clamp.

3.3.1.1.2 Magnet Clamp

3.3.1.1.3 Clamp Upper

Fig.4-2

3.3.2 TRAY DISC (FIG. 4-2)

(1) Insert and push a Driver in the emergency eject hole(A) at

the right side, or put the Driver on the Lever(B) of the Gear

Emergency and pull the Lever(B) in direction of arrow so

that the Tray Disc is ejected about 15~20mm. (2) Pull the Tray Disc until it is separated from the Base Main

completely.

(No.YD118)1-9

+ 21 hidden pages