JVC THC-3 Service manual

SERVICE MANUAL

DVD DIGITAL CINEMA SYSTEM

MB42020057

TH-C3

Area suffix

SP-THC3C

SP-THC3F

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

SP-THC3S

XV-THC3

SP-PWC3

UW ----------- Brazil,Mexico,Peru UY ------------------------ Argentina UJ ---------------------- U.S.Military

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35

No.MB420

2005/7

SPECIFICATION

Center unit (XV-THC3)

Audio section Total Harmonic Distortion*1 0.02%

Digital input*2 DIGITAL IN (DBS): -21 dBm to -15 dBm

(OPTICAL: 660 nm ± 30 nm)

Video section Video System PAL/NTSC

Horizontal Resolution 500 lines

Signal-to-Noise Ratio 64 dB

Video output level Composite: 1.0 V(p-p)/75 Ω

S-video-Y: 1.0 V(p-p)/75 Ω S-video-C: For PAL: 0.3 V(p-p)/75 Ω S-video-C: For NTSC: 0.286 V(p-p)/75 Ω Component-Y: 1.0 V(p-p)/75 Ω Component-PB/PR: 0.7 V(p-p)/75 Ω

Video input sensitivity/Impedance (VCR IN) Composite: 1.0 V(p-p)/75 Ω

S-video-Y: 1.0 V(p-p)/75 Ω S-video-C: For PAL: 0.3 V(p-p)/75 Ω S-video-C: For NTSC: 0.286 V(p-p)/75 Ω

Tuner section Tuning Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 710 kHz (at 9 kHz channel spacing)

530 kHz to 1 710 kHz (at 10 kHz channel spacing)

For Middle East 531 kHz to 1 602 kHz (at 9 kHz channel spacing)

530 kHz to 1 600 kHz (at 10 kHz channel spacing)

General Power Requirements AC 110-240 V , 50/60 Hz

Power Consumption 19 W (at operation)

1.9 W (in standby mode)

Dimensions (W × H × D) 400 mm × 85 mm × 399 mm

Mass 4.2 kg (9.3 lbs)

*1: This value is measured at System cord CONNECTOR for reference.

*2: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz)

Subwoofer (SP-PWC3)

Amplifier section Front 140W per channel, RMS at 4 Ω at 1 kHz, with 10 % total harmonic distortion.

Center/Surround 130W per channel, RMS at 4 Ω at 1 kHz, with 10 % total harmonic distortion. Subwoofer 140 W, RMS at 4 Ω at 100 Hz, with 10 % total harmonic distortion.

Speaker section Speaker unit 16 cm Bass-reflex

Power Handling Capacity 140 W

Impedance 4 Ω

Frequency Range 30 Hz to 200 Hz

General Power Requirements AC 110 V/ AC 127 V/AC 220-240 V , 50/60 Hz

Power Consumption 135 W (at operation)

0 W (in standby mode)

Dimensions (W × H × D) 169 mm × 411 mm × 451 mm

Mass 11.3 kg

1-2 (No.MB420)

Satellite Speakers (SP-XTHC3)

Front speakers (SP-THC3F) Speaker unit 8.0 cm

1.5 cm Bass-reflex, Magnetically Shielded

Power Handling Capacity 140 W

Impedance 4 Ω

Frequency Range 80 Hz to 20 kHz

Dimensions (W × H × D) 104.5 mm × 139 mm ×101 mm

Mass 0.56 kg each

Center speaker (SP-THC3C) Speaker unit 8.0 cm

1.5 cm Bass-reflex, Magnetically Shielded

Power Handling Capacity 140 W

Impedance 4 Ω

Frequency Range 80 Hz to 20 kHz

Dimensions (W × H × D) 137 mm × 105 mm × 104.5 mm

Mass 0.57 kg (1.3 lbs)

Surround speakers (SP-THC3S) Speaker unit 8.0 cm

Bass-reflex

Power Handling Capacity 140 W

Impedance 4 Ω

Frequency Range 80 Hz to 20 kHz

Dimensions (W × H × D) 111.5 mm × 148 mm × 106.5 mm

Mass 0.56 kg each

Designs & specifications are subject to change without notice.

(No.MB420)1-3

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 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.MB420)

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

Connector

Card wire

DVD pickup

DVD changer mechanism assembly

(No.MB420)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.MB420)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB420)1-7

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the metal cover (See Figs. 1 to 4)

(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 three

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

(3) Lift the rear section of the metal cover in the direction of the

arrow while extending the lower sections of the metal cover, release the seven claws a using a longer screwdriver from the inside as required. (See Fig. 4.)

Note:

Do not damage any parts and boards inside the main body when releasing the claws a using a longer screwdriver.

Metal cover

Fig.1

Metal cover

Fig.2

Metal cove

Fig.3

Metal cover

Claws aClaws a

1-8 (No.MB420)

Fig.4

3.1.2 Removing the front panel assembly

(See Figs. 5 and 6)

• Prior to performing the following procedures, remove the metal

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

wires from the connectors (CN456 board. (See Fig. 5.)

(2) Disconnect the card wires from the connectors (CN450

) on the main board. (See Fig. 5.)

CN460

(3) Remove the screw C attaching the earth wires to the main

board. (See Fig. 5.)

Reference:

When attaching the screw C, attach the earth wires with it. (See Fig. 5.)

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

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

(5) From the both and bottom sides of the main body, remove

the front panel assembly in the direction of the arrow while releasing the joints b and c. (See Fig. 6.)

, CN457) on the main

Front panel assembly

Main board

Card wire

CN457

CN450

CN456

Parallel wires

Earth wires

CN460

Card wire

Front panel assembly

Fig.5

Joint c Joint bJoint b

Fig.6

(No.MB420)1-9

3.1.3 Removing the DVD changer mechanism assembly (See Fig. 7)

• Prior to performing the following procedures, remove metal

cover and front panel assembly. (1) From the top side of the main body, remove the screw E at-

taching the wire protection board to the main board.

(2) Take out the wire protection board, and disconnect the

card wires from the connectors (CN401 main board.

Reference:

When attaching the wire protection board, attach the wire protection board after connecting the card wires to the connectors (CN401

(3) Remove the four screws F attaching the DVD changer

mechanism assembly on the bottom chassis.

(4) Take out the DVD changer mechanism assembly in the up-

ward direction.

Reference:

When attaching the DVD changer mechanism assembly, align the holes of the DVD changer mechanism assembly to the projections d on the bottom chassis.

3.1.4 Removing the rear panel (See Fig. 8)

• Prior to performing the following procedures, remove the metal

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

and eleven screws H attaching the rear panel.

to CN403) on the main board.

to CN403) on the

DVD changer mechanism assembly

Projections d

Wire protection board

Fig.7

CN402

Card wires

CN401

Bottom chassis

CN403

Main board

Rear panel

Fig.8

1-10 (No.MB420)

3.1.5 Removing the audio & digital input board

(See Figs. 9 and 10)

• Prior to performing the following procedures, remove the metal

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

wires from the connectors (CN411 board. (See Fig. 9.)

(2) Remove the screw J attaching the earth wires to the main

board. (See Fig. 9.)

Reference:

When attaching the screw J, attach the earth wires with it. (See Fig. 9.)

(3) From the back side of the main body, remove the screw K

and two screws L attaching the audio & digital input board to the rear panel. (See Fig. 10.)

(4) Move the audio & digital input board in the direction of the

arrow, and release the claw e of bracket board. (See Fig.

9.)

(5) Take out the audio & digital input board from the main

body.

3.1.6 Removing the tuner

(See Figs. 9 and 10)

• Prior to performing the following procedures, remove the metal

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

wire from the connector CN1

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

screws M attaching the tuner to the rear panel. (See Fig.

10.)

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

3.1.7 Removing the power supply board

(See Figs. 9 and 10)

• Prior to performing the following procedures, remove the metal

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

wires from the connectors (CN404 board. (See Fig. 9.)

(2) Remove the three screws N attaching the power supply

board. (See Fig. 9.)

(3) From the back side of the main body, remove the screw P

attaching the power supply board to the rear panel. (See Fig. 10.)

(4) Take out the power supply board from the main body.

Reference:

Remove the rear panel as required. (See "3.1.4 Removing the rear panel")

, CN412) on the main

on the tuner. (See Fig. 9.)

to CN407) on the main

Main board

Card wires

Earth wire

CN412

CN411

Bracket board

Craw e

CN407

CN406

CN1

Card wire

Audio & digital input board

CN405

Tuner

Power supply board

CN404

Parallel wires

Fig.9

Rear panel

Fig.10

(No.MB420)1-11

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